Rules for the presentation of graphical symbols for use on graphical signs—Part 3:Method for testing perceptibility
Some standard content:
ICS 01.080.01
National Standard of the People's Republic of China
GB/T16903.3—2013
Rules for the presentation of graphical symbols for use on graphical signs-Part 3: Method for testing perceptibility (ISO9186-2:2008, Graphical symbols—Test methods Part 2: Method for testing perceptual quality, MOD)2013-07-19 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2013-11-30 Implementation
GB/T16903.3—2013
Normative references
Terms and definitions
Information before test preparation
Test method
Equipment and test Materials
Test steps
7 Analysis and scoring
Results presentation
Appendix A (Informative Appendix)
Appendix B (Normative Appendix)
References
Terms and methods
Test description
GB/T16903.3—2013
GB/T16903 is one of the series of national standards for "Rules for the representation of graphic symbols". The structure and name of this series of national standards are as follows: GB/T16900 "General Rules for the Representation of Graphic Symbols". a
GB/T16901 "Rules for the Representation of Graphical Symbols for Technical Documents": divided into the following three parts: b
Part 1: Basic rules:
Part 2: Computer electronic file format specifications for graphic symbols (including graphic symbols in the reference symbol library) and their exchange requirements;
Part 3: Classification and coding of connection points and networks. c) GB/T16902 "Rules for the Representation of Graphical Symbols for Equipment", divided into the following four parts: Part 1: Prototype symbols;
Part 2: Form and use of arrows;
Part 3: Application guidelines;
Part 4: Design guidelines for graphic symbols (icons) for screens and displays. d) GB/T16903 "Rules for the Representation of Graphical Symbols for Signs", divided into the following three parts: Part 1: Design principles for public information graphic symbols; Part 2: Comprehension test methods;
Part 3: Perceptual test methods.
This part is part 3 of GB/T 16903. This part was drafted in accordance with the rules given in GB/T 1.1-2009. This part was revised and adopted IS09186-2:2008 "Graphic Symbol Test Methods Part 2: Perceptual Test Methods" by redrafting. Compared with IS9186-2:2008, this part has the following technical differences: GB/T15565 (all parts) which has no consistency relationship with the international standard replaces ISO17724 in the original international standard:
Add a term "subject" and replace the terms in the original international standard with those in GB/T15565: Since my country has not yet established a graphic symbol registration system, the relevant texts in the original standard have been deleted, such as Note 2 to Chapter 4 and Note 1 to Chapter 5:
The test requirements for different countries in the original standard have been changed to test requirements for different regions, such as 6.2.3 and 8.2; In 8.2, the record of the subject's situation is added and changed to "the subject's age, gender, education level, cultural or ethnic background and any disability, etc." to be consistent with the requirements of 6.2.1 of this part. This part also makes the following editorial changes to ISO9186-2:2008: some graphic symbols in the original international standard are replaced by graphic symbols in national standards, and the corresponding text descriptions are modified, as shown in Figure B.2;
According to the requirements of relevant national standards, 1x is used instead of lux to represent the unit of illumination. This part is proposed and managed by the National Technical Committee for Standardization of Graphic Symbols (SAC/TC59). Drafting units of this part: China National Institute of Standardization, Light Industry Standardization Institute. Main drafters of this part: Zou Chuanyu, Bai Dianyi, Chen Yongquan, Zhang Liang, Yang Zuonian. GB/T16903.3-2013
Graphic symbols should not only be easy to understand, but also have sufficient perceptibility so that the end-users can correctly identify the symbol elements in the actual environment. For the true meaning of the graphic symbol to be understood, the symbol elements should be recognizable. The example given in Figure 1 illustrates this concept of recognizability. People who see the "Lost and Found" symbol can recognize that the symbol contains a question mark, an umbrella and a box. If the box is seen as a brick, it means that the symbol is not recognizable enough. On the other hand, if the description is "an inverted triangle with a curved line", then it is considered that the umbrella can also be correctly recognized. In general, if an accurate shape description is given, or the name of the object to be depicted is specified. The symbol element is considered to be correctly recognized. Figure 1 Graphic symbol of the object "Lost and Found" In order to achieve the best perceptibility, the national standards provide graphic symbol designers with guidelines and requirements for graphic symbol design. For example, GB/T16903.1 and GB/T2893.3
However, following the relevant requirements and guidelines does not ensure the best design solution, and sometimes it may be necessary to rely on experience to check the key elements of the submitted graphic symbol. This need may appear in the early stages of design to determine whether the symbol elements can be recognized at a smaller viewing angle (due to the small size of the symbol or the long viewing distance): or when the results of the comprehension test show that a symbol is difficult to understand, you want to carefully check the symbol elements of the symbol to further improve the symbol. This need may also appear. This part of GB/T16903 describes the test method for assessing the recognizability of symbol elements. The core of this test method is to show a symbol to a representative group of subjects and ask them to describe it. The task of the subjects is to point out the symbol elements in the symbol image content. This will help to find out the elements in the graphic symbol that may cause recognition difficulties.
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1 Scope
Rules for the representation of graphic symbols for signs
Part 3: Perceptual test method
GB/T16903.3—2013
This part of GB/T16903 specifies the test method for the perceptualness of graphic symbols to determine whether the symbol elements of graphic symbols can be quickly recognized by the end-user population.
Normative references
The following documents are indispensable for the application of this document. For any dated referenced document, only the dated version applies to this document. For any undated referenced document, its latest version (including all amendments) applies to this document. GB/T15565.1—2008
Graphic symbols Terminology Part 1: General
GB/T15565.2—2008
3 Terms and definitions
Terminology Part 2: Signs and guide systems
Graphic symbols
The terms and definitions defined in GB/T15565 and the following terms and definitions apply to this document. For ease of use, some terms and definitions in GB/T15565.1 and GB/T15565.2 are repeated below. 3.1
Identifiability
The property of a symbol element in a graphic symbol that depicts an object or shape that can be understood. 3.2
Graphic symbol
graphical symbol
A symbol that has graphics as its main feature and does not rely on language to convey information. [GB/T15565.1—2008.Definition 2.5]
symbol element
symbol element
component of a graphic symbol with a specific meaning. [GB/T15565.1-2008,Definition 3.6]3.4
imagecontent
image content
description of the symbol elements and their relative positions in a graphic symbol [GB/T15565.1—2008,Definition 3.21]3.5
referent
the concept or thing to be represented by the graphic symbol. [GB/T15565.12008.Definition 3.14]
GB/T16903.3—2013
factorofdistance
The ratio of the observation distance () to the height of the mark (h). =1/h
[GB/T15565.2—2008, definition 2.3.12]3.7
Visualacuity
The ability of the observer to clearly see fine details with very small angular distances. [GB/T15565.2—2008, definition 2.3.6]] 3.8
visual angle
The line connecting the two ends of the longest axis of the mark being viewed from the observer's eyes forms the perpendicular intersection of the lines located at the four corners of the outermost edge of the basic
[GB/T
Text 2.3.10
The perpendicular intersection of the lines located at the four corners of the outermost edge of the figure 565
Application place
Definition 3bZxz.net
field of application
The application environment or scope of the line number of the figure
[GB/
208 Yuan.22
Comprehension test
comprehension te
A test procedure to quantify the degree of understanding of a solution. GB/T
respondent
Definition 261
A person who responds when a solution is tested. [GB/T15565.
4 Principles
2008. Definition 3.247
This test method is used to evaluate the perceptual performance of graphic symbols. The user group correctly identifies the symbol elements. The subjects identify the graphic symbol elements under guidance. The final result of the test is the proportion of subjects who correctly describe all the symbol elements (i.e., the "correct recognition rate"). This test method uses two or more graphic symbol display sizes, and other conditions remain unchanged. The larger size of the symbol is used to evaluate whether the recognition of the symbol elements meets the designer's expectations. The smaller size of the symbol can simulate the minimum viewing angle at which the symbol can be displayed normally, and is used to evaluate whether the symbol is recognizable when the viewing angle becomes smaller. Note: Appendix A explains the terms and methods used in this part. 5 Information to be prepared before the test
Before starting the test, the examiner should ensure that the submitter of the graphic symbol has checked the submitted information against the requirements for the proposal of standardized graphic symbols, which are stipulated by the relevant standardization organization or industry organization. 2
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The symbol submitter should submit the following information:
The name and contact details of the relevant organization that will accept the test results; the detailed requirements of the organization for the information submitted by the proposer and the examiner; GB/T16903.3—2013
The completed application form for each graphic symbol according to the requirements of the standardization organization. If the standardization organization does not have a specified application form for standardized graphic symbols, the proposer should fill in an application form for each graphic symbol according to the examiner's requirements. In addition to the completed application form, the following items should also be provided: a) Description of the image content such as the graphic symbol elements and their positions; The minimum viewing angle at which the symbol elements should be recognizable. The value of the minimum viewing angle can be derived from the symbol size and the expected viewing distance during actual use:
Confirm that the design of the submitted graphic symbol complies with the requirements of the relevant design principles, design requirements or design standards; C
Note: GB/T16903.1 specifies the standardized design principles and design standards for GB/T10001 public information graphic symbols: GB/T2893.1 and GB/T2893.3 specify the standardized design principles and design criteria for safety signs. According to the requirements of the standardization organization, a computer file in EPE format (or I format) for each scheme. d)
6 Test method
6.1 Equipment and test materials
6.1.1 Graphic symbols should be printed on paper materials. Please note that the printed materials should have sufficient contrast and resolution. If 2 dots/mm or 606 dots/m) is used, the resolution should be 6.1.2 Graphics should be stored in (2 ± 0. The angle on the plane should be (90 ± 10)% of the vertical plane at the observation distance. The observation distance and the correct head position should be kept constant. The test should ensure that the subject takes a comfortable sitting position and maintains the same sitting position during the test. The actual observation distance may be more feasible due to the small and unobvious head and body movements at this time. It is recommended to avoid using a closer observation distance. The illuminance of the test room measured at the surface shall be recorded at the vertical position of the graphic symbol. There should be no light in the test room. Note: The specified illuminance level can simulate the observation conditions in actual application. The illuminance used for the test shall be
6.1.4 The size of the graphic symbol shall be selected from the following specifications: 80mm×80mm, 40mm×40mm, 2mm×28mm, 20mm×20mm, 14mm×4mm, 10mm×10mm. If the relevant standard organization or industry organization requires the use of other sizes, the specified size shall be used in the test. Note 1: When the observation distance is 2m, the distance factors corresponding to the above 6 sizes shall be used as reference. The values of are 2550, 71, 100, 143 and 200 respectively; the corresponding viewing angles are 2.30°1.15°0.80°0.50.40° and 0.29 respectively. Note 2: For safety signs, the value of the distance factor: may be required to be 40. In this case, a 0mm×50mm symbol can be used. 6.1.5 At least two sizes should be used to assess recognizability. Each graphic symbol should be tested using a size of 80mm×80mm, and one or more smaller sizes should be selected from the sizes given in 6.1.4 for testing. The selected size should make the corresponding viewing angle equal to or less than the minimum recognizable viewing angle provided by the symbol submitter. Note 1: For larger display sizes, this test assesses whether the symbol elements can be recognized as objects or shapes as intended by the designer. Use The purpose of the smaller display size is to simulate the viewing conditions in actual applications to determine the recognizability of symbol elements. The correct recognition rate may be different for larger and smaller display sizes. Because the viewing conditions are better for larger display sizes, the correct recognition rate at this size should be higher, such as 90%. The correct recognition rate for smaller display sizes may be reduced to varying degrees depending on the type of symbol. For example, the standards for safety symbols may be more stringent than those for public information symbols. Note 2: Since it is impossible to design a test method that can simulate all possible actual conditions, only the display size is changed while other variables remain unchanged.
GB/T16903.3—2013
6.1.6 By default, graphic symbols should be displayed as black graphics and white background. However, if the graphic symbols being tested always use one or more specific colors in actual use (such as graphic symbols used in safety signs), the same colors should be used in the test materials. 6.1.7 If two or more graphic symbols are presented to a subject, the size of the graphic symbols should be the same. If two or more symbols are tested, the order in which the graphic symbols are presented to each subject should be randomized. To avoid fatigue, the number of symbols presented to each subject should not exceed 15.
6.1.8 Subjects should be able to record descriptions of the symbol elements. Subjects may write their descriptions on paper or type them on a computer keyboard. If necessary (e.g., the subject's handwriting is illegible), the subject's description may be recorded by the examiner. 6.2 Subjects
6.2.1 At least 25 subjects should be used for each size of each symbol. The subjects should be a representative sampling of the end-user population in terms of age, sex, education, cultural or ethnic background, and physical fitness (if relevant). When testing safety symbols, special attention should be paid to including vulnerable individuals. NOTE: The representativeness of the sample can be judged based on the information provided by the subjects. 6.2.2 All subjects should have normal or corrected-to-normal visual acuity unless the end-user population will not be able to wear glasses or contact lenses in the environment in which the symbols are used.
NOTE: A person with "normal visual acuity" can see details of 1 point in visual angle. This condition is also called "20/20 vision" or "6/6 vision." "Corrected-to-normal" means that the person needs and wears glasses or contact lenses to achieve normal visual acuity of 6.2.3 It is sufficient for the subjects to be from the same region. However, it is advisable to consider whether the graphic content or specific application areas of the symbol require testing in more than one region. 6.2.4 The symbol should not be presented to the subjects before testing. People who have been involved in the design of the symbol should not be subjects. If a symbol has been subjected to an evaluation test or a comprehension test, the subjects who participate in these tests should not be subjects in the perceptual test. 6.3 The subject should be a person who has been trained and experienced in behavioral experiments. For consistency, it is best if the subject is the same person. 6.4 Testing procedures 6.4.1 The visual acuity of each subject should be assessed. Visual acuity should be measured using a standard test method such as the Snellen chart or the Rondo ring chart under the specified test illumination. 6.4.2 The subject's task should include a brief description of all symbol elements. This should be explained to the subjects according to Appendix B. Note: The subject's task is derived from what is referred to as a naming task in the literature. Background information can be found in references [11] and [12]. 6.4.3 The task should be self-paced, i.e., the subject should be able to complete the description in as much time as possible. 6.4.4 The graphic symbol should remain visible until the subject indicates that the description has been recorded. 7 Analysis and Scoring
7.1 An assessor should be designated to analyze and score the subject's description of each graphic symbol. The assessor should be a behavioral scientist or someone with considerable knowledge and experience in conducting human subject tests and analyzing subject responses. The main examiner (see 6.3) may also serve as an assessor. 7.2 First, the assessor should develop a correct description for each symbol element in the graphic content based on the subject's description of each symbol element. The correct description is best based on the results of a pilot test with a limited number of subjects, or developed in conjunction with one or more colleagues. The subjects in the pilot test should not be subjects in the main test. The correct description of the listed symbol elements should follow the following two principles:
a) Any accurate description of the shape of the symbol element is correct: b) The object to be depicted by the graphic symbol is named in the description and the name is correct. 4
The general rule for determining the correctness of the description is: GB/T16903.3—2013
All corresponding descriptions of the symbol elements are classified as correct, such as "human figure", "body", "person", "individual" or "man"; although the name of the symbol element is not stated, it is classified as correct when there is an implicit explanation of it, such as explaining "put on something" instead of "table";
Abstract but clear brief descriptions of objects are classified as correct. For example, "a string of points" instead of "conveyor belt", or "a line" instead of "horizon";
Several symbol elements involved in the explanation are classified as correct. For example, "porter" instead of "man wearing a hat"; if the name of the object indicated is not the object expected to be depicted, it is classified as incorrect. For example, "hand" instead of "glove". 7.3 The assessor shall compare the subject's description of the graphic symbol, the corresponding image content, and the correct description of each symbol element. Based on the comparison, the assessor shall determine whether the subject's description includes all the symbol elements in the image content. 7.4 For each display size, the assessor shall determine the number of subjects in the test group who correctly described all the symbol requirements. This number shall be converted into a percentage, i.e. the correct recognition rate.
8 Representation of results
8.1 The vertical illuminance at the test symbol [unit: lux (1x)] shall be recorded. 8.2 For each group of subjects, the following information shall be recorded: number of subjects;
region where the test was conducted;
age, sex, education level, cultural or ethnic background, and any disabilities of the subjects. 8.3 For each symbol tested, the following information should be recorded: the object or meaning of the graphic symbol, its function, application area, and the end-user group; the sizes tested and copies of the graphic symbols at these sizes; the image content and the correct descriptions of the symbol elements that can be selected; for each symbol element, the number of subjects who gave a correct description, a list of incorrect answers and the corresponding frequency, and the number of subjects who did not mention the symbol element; the correct recognition rate for each display size investigated. GB/T 16903.3—2013
A.1 Overview
Appendix A
(Informative Appendix)
Explanation of terms and methods
This appendix is used to explain the terms used and the methods adopted in this part of GB/T 16903. For this purpose, two examples of graphic symbols are given (Figure A.1).
A.2 Graphic symbols
Figure A.1 gives an example of a graphic symbol representing an airport viewing area. Figure A
A.3 Object or meaning
Airport viewing area
A.4 Function
Examples of possible graphic symbols
Represents areas in an airport where people can view aircraft and runways. A.5
Application areas
Information to the public, especially in airport terminals. A.6 End users
Airplane passengers, people seeing off passengers, and other people in airport terminals. 6
A.7 Graphic content
A figure waving at a taking-off aircraft, a horizon. A.8 Symbol elements
A figure with arms raised, an aircraft, a horizon. A.9 Other descriptions of symbol elements
Synonymous interpretations of "figure" are also correct, such as "person", "man", etc. "Figure with arms raised" is also correct when described as "figure waving". GB/T16903.3—2013
Abstract descriptions of the "horizon" such as "lines" and "crossbars" are correct. However, if the foreground and background are pointed out, such as "there is a waving figure in the foreground and a plane taking off in the background", it is considered that the description of the "horizon" element is missing and therefore incorrect. Such an answer should be considered incorrect because it is not certain that the subject saw the line element; this answer may also be based on the relative size of the figure and the plane. The expected minimum viewing angle
The minimum size of the graphic symbol used in the guidance system. Therefore, the expected minimum viewing angle is
30
equivalent to a road
observation distance of 0m.
GB/T16903.3—2013
Appendix B
(Normative Appendix)
Test Instructions for Subjects
B.1 The examiner shall inform the subjects that their task is to briefly describe all the symbol elements that make up the graphic symbol. The description of the symbol elements can be abstract (such as "square" or "circle"), or the symbol elements can be interpreted as objects (such as "suitcase" or "car"). The examiner shall emphasize that the subject's task is not to point out the name of the graphic symbol with a word or give its meaning. The subject should not be told about the use environment of the graphic symbol. B.2 It is not enough to guide the subject's task through verbal description. The examiner shall use the five symbols given in Figures B.1 to B.5 as examples. These symbols shall be presented to the subjects one by one at a viewing distance of (2±0.04)m, and the symbol size shall be 80mm×80mm.
Figure B.1 Description Example: Frontal portraits of a standing woman and man with a straight line in the middle. Figure B.2 Description Example: Frontal view of a baby and the outline of a milk bottle.2 First, the assessor should formulate a corresponding correct description for each symbol element in the graphic content in response to the description submitted by the subject. The correct description is best based on the results of a preliminary test with a limited number of subjects, or developed in conjunction with one or more colleagues. The person who served as the subject in the preliminary test should not be the subject in the main test. The correct description of the listed symbol elements should follow the following two principles:
a) Any accurate description of the shape of the symbol element is correct; b) The object that the graphic symbol is intended to depict is named in the description and the name is correct. 4
The general rule for determining the correctness of the description is: GB/T16903.3—2013
All corresponding descriptions of the symbol elements are classified as correct, such as "human figure", "body", "person", "individual" or "man"; although the name of the symbol element is not stated, it is classified as correct when there is an implicit explanation for it, such as explaining "put on something" instead of "table";
Abstract but clear brief descriptions of objects are classified as correct. For example, "a string of dots" instead of "conveyor belt", or "a line" instead of "horizon"; several symbol elements involved in the interpretation are classified as correct. For example, "porter" instead of "man wearing a hat"; if the name of the object indicated is not the object expected to be depicted, it is classified as incorrect. For example, "hand" instead of "glove". 7.3 The assessor should compare the subject's description of the graphic symbol, the corresponding image content and the correct description of each symbol element. Based on the comparison, the assessor should determine whether the subject's description includes all the symbol elements in the image content. 7.4 For each display size, the assessor should determine the number of subjects in the test group who correctly described all the symbol elements. This number should be converted into a percentage, that is, the correct recognition rate.
8 Representation of results
8.1 The vertical illuminance at the test symbol [unit is lux (1x)] should be recorded. 8.2 For each group of subjects, the following information should be recorded: the number of subjects;
the region where the test was conducted;
the age, sex, education level, cultural or ethnic background and any disabilities of the subjects. 8.3 For each symbol tested, the following information should be recorded: the object or meaning of the graphic symbol, its function, application area, and the end-user population; the sizes tested and copies of the graphic symbols at these sizes; the image content and the correct descriptions available for the symbol elements; for each symbol element, the number of subjects who gave a correct description, a list of incorrect answers and the corresponding frequencies, and the number of subjects who did not mention the symbol element;
the correct recognition rate for each display size investigated. GB/T 16903.3—2013
A.1 Overview
Appendix A
(Informative Appendix)
Explanation of terms and methods
This appendix is used to explain the terms used and the methods adopted in this part of GB/T 16903. For this purpose, two examples of graphic symbols are given (Figure A.1).
A.2 Graphic symbols
Figure A.1 gives an example of a graphic symbol for an airport viewing area. Figure A
A.3 Object or meaning
Airport viewing area
A.4 Function
Possible examples of graphic symbols
Indicates that people in an airport can view aircraft and runways. A.5
Application areas
Information to the public, especially in airport terminals. A.6 End users
Airplane passengers, people seeing off passengers, and other people in airport terminals. 6
A.7 Graphic content
A figure waving at a taking-off aircraft, a horizon. A.8 Symbol elements
A figure with arms raised, an aircraft, a horizon. A.9 Other descriptions of symbol elements
The synonymous interpretation of "human figure" is also correct, such as "person", "man", etc. "Human figure with raised arms" is also correct when described as "human figure waving". GB/T16903.3—2013
Abstract descriptions of "horizon" such as "line" and "crossbar" are correct, but if the foreground and background are pointed out, such as "there is a waving human figure in the foreground and a taking-off airplane in the background", it is considered that the description of the element "horizon" is missing and therefore incorrect. Such an answer should be considered incorrect because it is not certain that the subject saw the line element; this answer may also be based on the relative sizes of the human figure and the airplane. Expected minimum viewing angle
The minimum size of the graphic symbol used in the guidance system Therefore, the expected minimum viewing angle is
30
equivalent to a road
observation distance of 0m.
GB/T16903.3—2013
Appendix B
(Normative Appendix)
Test Instructions for Subjects
B.1 The examiner shall inform the subjects that their task is to briefly describe all the symbol elements that make up the graphic symbol. The description of the symbol elements can be abstract (such as "square" or "circle"), or the symbol elements can be interpreted as objects (such as "suitcase" or "car"). The examiner shall emphasize that the subject's task is not to point out the name of the graphic symbol with a word or give its meaning. The subject should not be told about the use environment of the graphic symbol. B.2 It is not enough to guide the subject's task through verbal description. The examiner shall use the five symbols given in Figures B.1 to B.5 as examples. These symbols shall be presented to the subjects one by one at a viewing distance of (2±0.04)m, and the symbol size shall be 80mm×80mm.
Figure B.1 Description Example: Frontal portraits of a standing woman and man with a straight line in the middle. Figure B.2 Description Example: Frontal view of a baby and the outline of a milk bottle.2 First, the assessor should formulate a corresponding correct description for each symbol element in the graphic content in response to the description submitted by the subject. The correct description is best based on the results of a preliminary test with a limited number of subjects, or developed in conjunction with one or more colleagues. The person who served as the subject in the preliminary test should not be the subject in the main test. The correct description of the listed symbol elements should follow the following two principles:
a) Any accurate description of the shape of the symbol element is correct; b) The object that the graphic symbol is intended to depict is named in the description and the name is correct. 4
The general rule for determining the correctness of the description is: GB/T16903.3—2013
All corresponding descriptions of the symbol elements are classified as correct, such as "human figure", "body", "person", "individual" or "man"; although the name of the symbol element is not stated, it is classified as correct when there is an implicit explanation for it, such as explaining "put on something" instead of "table";
Abstract but clear brief descriptions of objects are classified as correct. For example, "a string of dots" instead of "conveyor belt", or "a line" instead of "horizon"; several symbol elements involved in the interpretation are classified as correct. For example, "porter" instead of "man wearing a hat"; if the name of the object indicated is not the object expected to be depicted, it is classified as incorrect. For example, "hand" instead of "glove". 7.3 The assessor should compare the subject's description of the graphic symbol, the corresponding image content and the correct description of each symbol element. Based on the comparison, the assessor should determine whether the subject's description includes all the symbol elements in the image content. 7.4 For each display size, the assessor should determine the number of subjects in the test group who correctly described all the symbol elements. This number should be converted into a percentage, that is, the correct recognition rate.
8 Representation of results
8.1 The vertical illuminance at the test symbol [unit is lux (1x)] should be recorded. 8.2 For each group of subjects, the following information should be recorded: the number of subjects;
the region where the test was conducted;
the age, sex, education level, cultural or ethnic background and any disabilities of the subjects. 8.3 For each symbol tested, the following information should be recorded: the object or meaning of the graphic symbol, its function, application area, and the end-user population; the sizes tested and copies of the graphic symbols at these sizes; the image content and the correct descriptions available for the symbol elements; for each symbol element, the number of subjects who gave a correct description, a list of incorrect answers and the corresponding frequencies, and the number of subjects who did not mention the symbol element;
the correct recognition rate for each display size investigated. GB/T 16903.3—2013
A.1 Overview
Appendix A
(Informative Appendix)
Explanation of terms and methods
This appendix is used to explain the terms used and the methods adopted in this part of GB/T 16903. For this purpose, two examples of graphic symbols are given (Figure A.1).
A.2 Graphic symbols
Figure A.1 gives an example of a graphic symbol for an airport viewing area. Figure A
A.3 Object or meaning
Airport viewing area
A.4 Function
Possible examples of graphic symbols
Indicates that people in an airport can view aircraft and runways. A.5
Application areas
Information to the public, especially in airport terminals. A.6 End users
Airplane passengers, people seeing off passengers, and other people in airport terminals. 6
A.7 Graphic content
A figure waving at a taking-off aircraft, a horizon. A.8 Symbol elements
A figure with arms raised, an aircraft, a horizon. A.9 Other descriptions of symbol elements
The synonymous interpretation of "human figure" is also correct, such as "person", "man", etc. "Human figure with raised arms" is also correct when described as "human figure waving". GB/T16903.3—2013
Abstract descriptions of "horizon" such as "line" and "crossbar" are correct, but if the foreground and background are pointed out, such as "there is a waving human figure in the foreground and a taking-off airplane in the background", it is considered that the description of the element "horizon" is missing and therefore incorrect. Such an answer should be considered incorrect because it is not certain that the subject saw the line element; this answer may also be based on the relative sizes of the human figure and the airplane. Expected minimum viewing angle
The minimum size of the graphic symbol used in the guidance system Therefore, the expected minimum viewing angle is
30
equivalent to a road
observation distance of 0m.
GB/T16903.3—2013
Appendix B
(Normative Appendix)
Test Instructions for Subjects
B.1 The examiner shall inform the subjects that their task is to briefly describe all the symbol elements that make up the graphic symbol. The description of the symbol elements can be abstract (such as "square" or "circle"), or the symbol elements can be interpreted as objects (such as "suitcase" or "car"). The examiner shall emphasize that the subject's task is not to point out the name of the graphic symbol with a word or give its meaning. The subject should not be told about the use environment of the graphic symbol. B.2 It is not enough to guide the subject's task through verbal description. The examiner shall use the five symbols given in Figures B.1 to B.5 as examples. These symbols shall be presented to the subjects one by one at a viewing distance of (2±0.04)m, and the symbol size shall be 80mm×80mm.
Figure B.1 Description Example: Frontal portraits of a standing woman and man with a straight line in the middle. Figure B.2 Description Example: Frontal view of a baby and the outline of a milk bottle.5
Application area
Information to the public, especially in airport terminals. A.6End-users
Airplane passengers, people seeing off passengers and other people in airport terminals. 6
A.7Image content
A figure waving at a plane taking off, a horizon. A.8Symbol elements
A figure with arms raised, a plane, a horizon. A.9Other descriptions of symbol elements
The synonymous interpretation of "figure" is also correct, such as "person", "man", etc. "figure with arms raised" is also correct when described as "figure waving". GB/T16903.3—2013
The abstract description of "horizon" such as "line" and "crossbar" is correct, but if the foreground and background are pointed out, such as "there is a waving figure in the foreground, and
a plane taking off in the background", it is considered that the description of the element "horizon" is missing, so it is incorrect. Such an answer should be considered incorrect because it is not certain that the subject saw the line elements; this answer may also be based on the relative sizes of the figure and the aircraft. The minimum expected viewing angle
The minimum size of the graphic symbol used in the guidance system Therefore, the minimum expected viewing angle is
30
Equivalent to a road
observation distance of 0m.
GB/T16903.3—2013
Appendix B
(Normative Appendix)
Test instructions for subjects
B.1 The examiner should inform the subjects that their task is to briefly describe all the symbol elements that make up the graphic symbol. The description of the symbol elements can be abstract (such as "square" or "circle"), or the symbol elements can be interpreted as objects (such as "suitcase" or "car"). The examiner should emphasize that the subject's task is not to point out the name of the graphic symbol with a word or give its meaning. The subjects should not be informed of the context in which the graphic symbols are to be used. B.2 It is not sufficient to instruct the subjects on the task by verbal description alone. The examiner should use the five symbols given in Figures B.1 to B.5 as examples. These symbols should be presented to the subjects one by one at a viewing distance of (2 ± 0.04) m. The symbol size should be 80 mm × 80 mm.
Figure B.1 Describes the example: Frontal portraits of standing women and men with a straight line in the middle. Figure B.2 Describes the example: Frontal view of a baby and the outline of a milk bottle.5
Application area
Information to the public, especially in airport terminals. A.6End-users
Airplane passengers, people seeing off passengers and other people in airport terminals. 6
A.7Image content
A figure waving at a plane taking off, a horizon. A.8Symbol elements
A figure with arms raised, a plane, a horizon. A.9Other descriptions of symbol elements
The synonymous interpretation of "figure" is also correct, such as "person", "man", etc. "figure with arms raised" is also correct when described as "figure waving". GB/T16903.3—2013
The abstract description of "horizon" such as "line" and "crossbar" is correct, but if the foreground and background are pointed out, such as "there is a waving figure in the foreground, and
a plane taking off in the background", it is considered that the description of the element "horizon" is missing, so it is incorrect. Such an answer should be considered incorrect because it is not certain that the subject saw the line elements; this answer may also be based on the relative sizes of the figure and the aircraft. The minimum expected viewing angle
The minimum size of the graphic symbol used in the guidance system Therefore, the minimum expected viewing angle is
30
Equivalent to a road
observation distance of 0m.
GB/T16903.3—2013
Appendix B
(Normative Appendix)
Test instructions for subjects
B.1 The examiner should inform the subjects that their task is to briefly describe all the symbol elements that make up the graphic symbol. The description of the symbol elements can be abstract (such as "square" or "circle"), or the symbol elements can be interpreted as objects (such as "suitcase" or "car"). The examiner should emphasize that the subject's task is not to point out the name of the graphic symbol with a word or give its meaning. The subjects should not be informed of the context in which the graphic symbols are to be used. B.2 It is not sufficient to instruct the subjects on the task by verbal description alone. The examiner should use the five symbols given in Figures B.1 to B.5 as examples. These symbols should be presented to the subjects one by one at a viewing distance of (2 ± 0.04) m. The symbol size should be 80 mm × 80 mm.
Figure B.1 describes the example: frontal portraits of standing women and men with a straight line in the middle. Figure B.2 describes the example: frontal view of a baby and the outline of a milk bottle.
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