This standard specifies the technical requirements and usage of ISO characters and test chart No. 1 used in microfilm technology. This standard applies to ISO characters and test chart No. 1, which are used to test the readability of microfilm production systems, reading and enlarging and copying equipment. GB/T 18405-2001 Microfilm technology ISO characters and test chart No. 1 characteristics and their use GB/T18405-2001 standard download decompression password: www.bzxz.net
This standard specifies the technical requirements and usage of ISO characters and test chart No. 1 used in microfilm technology. This standard applies to ISO characters and test chart No. 1, which are used to test the readability of microfilm production systems, reading and enlarging and copying equipment.

1CS37.080
National Standard of the People's Republic of China
GB/T 18405—2001
idtIS0446:1991
Micrographics
ISO character and test chart No. 1, --Descriptinn and use2001-08-01Published
Shandong People's Republic of China
General Administration of Quality Supervision, Inspection and Quarantine
2002 04:01 Implementation
GB/T18405—2001
This standard is equivalent to S0446.191 contraction image control technology—150 car symbol analysis I501 test chart—to be used and used. This standard makes the following editorial changes to IS446: 1. Change the 45 degree and 45 degree left and right in 4.1 to 45\. 2. Change the required identification of the test in 5.1 from the narrative form to the form of listing in the standard. This standard is limited to the recording of the interference.
This standard is moved and merged by the National Document Imaging Technology Standardization Technical Committee. This standard is drafted by the National Document Imaging Technology Standardization Technical Committee. The main drafters of the standard are: Liu Peiban, Li Jin, Xie Xiaoxian, Liu Dingjun, and Yu Lianyang. TYKAONTKAca
GBT18405-2001
IsoForeword
TS (International Organization for Standardization) is a federation of national standards bodies (TS() associations) around the world. The preparation of international standards is usually accomplished through 15 technical committees: the technical committees have determined the items of interest and have representatives of relevant schools to participate in the work of the technical committees. There are official and unofficial regional organizations with IS, which can compete for this work. S and the International Electrical and Electronics Commission (IEC) in all electrotechnical technical standardization support the close cooperation. International Standards adopted by the technical committees are circulated to the member bodies for voting. They can be published as international standards. The approval of at least one voting member is required. International Standards) 446 is composed of IS>/TC171-Document and image recording, storage and use of microfilm and optical storage* Technical Committee.
This second edition combines and replaces the first editions of TS435:197 and 5044:197, and combines them into a new international standard.
Appendix A of this international standard contains the following information: GH18405-2001
Regardless of the reproduction method used, the image obtained is always unreadable, and some information becomes unreadable. The reason for the visual fatigue caused by long-term reading is that the readability of the image can be evaluated by measuring the limit of resolution, that is, the limit of the ability to resolve lines in different directions. However, the image quality corresponding to the limit of resolution does not mean that the reader can read it comfortably or that it will not cause fatigue during long-term reading. Therefore, an evaluation standard that is more in line with the actual situation should be developed. Similar to the font cabinet in the printing industry, characters with easy-to-judge outlines and details can meet the above requirements. The main practical use of ISO symbols is based on the following test criteria: 1) If a particular copying process can produce a set of ISO symbols of a certain degree of accuracy into a recognizable image, then it can be assumed that the same copying process can produce images of similar size that are scientifically satisfactory, especially images that are readable within a certain reading time and do not cause visual fatigue to the viewer. Generally speaking, different observers will obtain substantially the same results when recognizing the same set of ISO symbols. TYKNTKAca
1 Model
National Standard of the People's Republic of China
Micrographic Technology
Characteristics and Basic Use of ISO Character and Number Test Charts Micrographics-Iso eharacler nnd testchart Na. 1—Description and useGB/T18405—2001
Idt150 446:1991
wood standard specifies "technical requirements and use methods for 1S characters and 1S test images used in microfilm screening technology" This standard specifies the 1S character bottle test image for the microfilm production system, the readability of the whole printing section and the readability of the whole printing section. 2 Reference standards
The following standards also contain clauses, which become the clauses of this standard through their use in this standard. The versions shown in this standard are valid at the time of publication. All new standards will be revised. All parties using the wood standard should use the following standards to measure the performance of the new version of the wood GB3218: priority number and preferred light number system (S573) GB/T 1543-1988
system standard measurement (S477)
GB/T 6159.1-1985
GR/T 6I59, 2-1SE5
GR/T 150.31S91
(ET 615$.4—094
G5/T R13. 5.. 2090
Vocabulary Part: General terms(neg150 6196-1, 1980) Microphotography
Microphotography
Part 1: Film processing (E01506196-31983) Microphotography
Terminology Part 6: Equipment (0S061965199) Part 5: Quality and performance of images (1906175:1987)
GH615.213) Microphotography Part 2: Image layout and recording methods (EQ15 GB/T1552-198) GH/T115CL-38 GB/T1151-1989 Photographic density measurement conditions (neg1S05-3:1984) GH/T1282-1331 This standard adopts the definition in GB/6159. 4150 Hand characters 4.1 Description 1S) Hand characters are a type of special characters. The following are the specifications of the characters: The font of the character is a few lines with two lines. The height of the practice is an octagon, as shown in the figure, and the size is shown in 52. Description
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China 2001-08-1 Approved 2002-04-0: Implementation
GB/T:8405-20D1
Random Example
Figure 1 is called readability test or S-shaped effective large-scale drawing rods in the octagon can have four different orientations, the corresponding terms and shapes are: two
center (45
left (15\
4.2 Application
In microfilm technology, 1S door characters can be made into black or color test charts to check the production system of microfilm products; or ISO symbols can be used to make microfilm test charts to check the reading and printing equipment of microfilm products. JS door characters can also be used! Test the quality of images produced by other imaging techniques (photography, duplication, etc.). Test chart No. 51
The test chart should be produced on an opaque substrate. 5.1.1 Opaque substrates made of opaque materials (preferably white glossy materials): their reflective visual index should be measured in accordance with the relevant provisions of GB/T591 and GB/12822, and the measured value should not exceed 0.08. According to the relevant provisions of GB/7513, their opacity should not exceed 0.1%. The test chart should be printed on an opaque substrate. 5.1.2 Transparent substrates
The transparent substrate used for the test should be made of non-transparent materials. The density of the substrate should not exceed 0.8 according to the relevant provisions of GB/T1150/1151. The test pattern on a suitable substrate can be a positive image or a negative image:
5.2 Special test pattern
Three test patterns are composed of multiple ISO characters, as shown in Figure 2. 5.2.1 Character layout
Single character group shall be the same size and the spacing shall be 1.1 IS character group. 1 S character is arranged in a square, such as 3. The smallest spacing between two adjacent groups of characters in the vertical and horizontal directions should be at least 2 times the smallest S character in the two groups: -TTYKAoNTKAca
5.2.2 Character size
GB/T18405-.2001
Figure 2 [Signature diagram] Example of grouping
Each character has a length of 9, and the value should be R20 as specified in GB/T321. The unit is 0.01mm
, and the height difference of the black and white lines of the characters is ±7 (see Figure 4), and the height difference of the character is ±2.
Figure 4 Line Width Measurement
The minimum difference in the diffuseness between the two substrates should be 3.0 on the substrate and 1.0 on the substrate. The visual density of the symbol made on the opaque substrate (paper test) is not higher than that of the white pattern. The visual density of the symbol is not higher than that of the white pattern.
5.2.4 Identification of Symbols
Each symbol group should be marked with a symbol corresponding to the symbol size for easy identification. For example, the number should be 0.4 nm for the symbol group: GB/T18405-2001
The numbers marked should be the most direct. 1. The height of the small number should be the same as that of the standard character. 5.3 Density measurement area
There are two density test areas on the test image to check whether the test image meets the requirements of .2.3. These two test areas reflect the background density and character density of the test image respectively. Each test area should be no less than 10m×1011. Note: The test area cannot be used to test the height of the digital image. See E.57. 5.4 Sign
The quality test image should have the following Subscript:
"|Test chart"
This national standard number:
-Supervisory unit:
..-Production unit.
5.51 Test chart and other supervision
"Test chart" shall comply with the provisions of this standard and be supervised by a nationally recognized machine. The use of the No. 61 test chart
6.1 method
Place the No. 1 test chart at the specified position for microfilming to achieve the inspection of the entire image area 6-2
The diffuse transmission visual density of the image of the test chart No. 1 is measured according to the relevant provisions of R/T61. When the image is tested, the value should be within the range of 1.50~1.7℃. 6.3 Readability test
Use a display with a diameter not less than 1.5 times and a magnification of 31.5 times behind the measuring eyepiece to measure the image of the test chart No. 1.
When the black lines of each image source of a group of S () characters are all identifiable and there is no broken hair, the ISO characters in this size group can be considered to be "readable".
Figure 5 gives an example of "readable" and "technically readable". *The limit size of the "readable" character is related to the shooting frequency. They are specified in the relevant standards for determining the use of optical components and coding conditions.
"Unreadable"
Figure 5 "readable" and "unreadable" examples -TTKAoNTKAca
GA/T18405-2001
Appendix A
[Reminder Appendix]
Added part of No. 1 test strip
In order to complete the first 1 try function, you can make a test strip in the character correction device, as shown in Figure A1. 41 Description
The following line test line shot can be generated continuously:
The test strips are 8 discontinuous lines on the four sides of the model, of which 4 are white and 1 is blue. The line is divided into 10 sections with a range of 0.22~0.41. The following strips are used to detect the light and washability of the H strips. The strips are 4 white and 1 white. The length and width of the strips are in the same direction as the small strips on the same side.
42 Operation and instructions
A2.1 Line readability
When the black and white strips in the same strips can maintain a basically smooth image, the strips are considered to be "readable" within the width range.
42.2 Setting of the double-washing conditions
When the black stripes and the white stripes in the same strips are of equal length, the best setting is achieved. A2.3 System readability and step-by-step control procedures. ) Adjust the camera speed at various rates to achieve the best resolution and balance of light and color (see A2.1): h) Prepare the next generation of microforms using a test plate containing 5 test images at different reduction ratios to produce the first generation of microforms, and then make the next generation of microform copies and prints according to the technical requirements. Baby! , dare to print the image > the whole film area to dig out the story of the small rate symbol group and the sound to be concave two kinds of clear and continuous quality fine model line segment. The core symbol group and the line segment are the value of the stimulus, that is, the ability of the system and the limit of the microfilm suspension room to the quality disk
481524
18030140212
23218263092
with the drop part of the No. 1 source attemptIf there is no broken lint, the ISO character in this size group can be considered to be "readable".
Figure 5 gives an example of "readable" and "technically readable". The limit size of the "readable" character is related to the shooting rate used. They are specified in the relevant standards for determining the use conditions of optical components and coding.
“Unreadable”
Figure 5 “readable\ and “unreadable\” will be examples-TTKAoNTKAca
GA/T18405—2001
Appendix A
【Prompt Appendix】
Additional part of No. 1 test country
In order to complete the first 1 try function, you can make a test strip in the character correction device, as shown in Figure A1.41 Description
The following line Ding test line shot can be generated continuously:
The 8 discontinuous lines of the four sides of the test are of the same shape, of which 4 are The strips are divided into 10 sections with a range of 0.22~0.41. The strips are divided into 7 sections with a range of 0.22~0.41. The following strips are used to detect the light and washability. The strips are 4 white and 1 small strip. The length and width of the strips are the same as the small continuous strips on the same side.
42 Use and instructions
A2.1 Line readability
When the black and white segments of the non-contradictory continuous strips on the same side can maintain a basically smooth image, it can be considered that the width range is met. 42.2 Setting of the double processing conditions for the light source When the black stripe and the self-color stripe are of equal length in the continuous processing, the best setting is achieved. A2.3 System step-by-step control procedure. ) Adjust the camera speed to achieve the best resolution and balance the color at various speeds (see A2.1): h) The following are the preparations for the next generation of verification and printing. ) Provide a test plate containing 5 test patterns at different reduction ratios. The first generation of microforms is produced, and the next generation of microforms is copied and printed according to the technical requirements. The image is restored on the standard plate (with the help of the printing plate). The image is printed in the whole image area and the image is printed with a small number of symbols and a concave line segment. The symbol group and the line segment are the value of the excitation system and the limit of the microfilm disc.If there is no broken lint, the ISO character in this size group can be considered to be "readable".
Figure 5 gives an example of "readable" and "technically readable". The limit size of the "readable" character is related to the shooting rate used. They are specified in the relevant standards for determining the use conditions of optical components and coding.
“Unreadable”bzxz.net
Figure 5 “readable\ and “unreadable\” will be examples-TTKAoNTKAca
GA/T18405—2001
Appendix A
【Prompt Appendix】
Additional part of No. 1 test country
In order to complete the first 1 try function, you can make a test strip in the character correction device, as shown in Figure A1.41 Description
The following line Ding test line shot can be generated continuously:
The 8 discontinuous lines of the four sides of the test are of the same shape, of which 4 are The strips are divided into 10 sections with a range of 0.22~0.41. The strips are divided into 7 sections with a range of 0.22~0.41. The following strips are used to detect the light and washability. The strips are 4 white and 1 small strip. The length and width of the strips are the same as the small continuous strips on the same side.
42 Use and instructions
A2.1 Line readability
When the black and white segments of the non-contradictory continuous strips on the same side can maintain a basically smooth image, it can be considered that the width range is met. 42.2 Setting of the double processing conditions for the light source When the black stripe and the self-color stripe are of equal length in the continuous processing, the best setting is achieved. A2.3 System step-by-step control procedure. ) Adjust the camera speed to achieve the best resolution and balance the color at various speeds (see A2.1): h) The following are the preparations for the next generation of verification and printing. ) Provide a test plate containing 5 test patterns at different reduction ratios. The first generation of microforms is produced, and the next generation of microforms is copied and printed according to the technical requirements. The image is restored on the standard plate (with the help of the printing plate). The image is printed in the whole image area and the image is printed with a small number of symbols and a concave line segment. The symbol group and the line segment are the value of the excitation system and the limit of the microfilm disc.
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