This part of GB/T19475 specifies the characteristics of test images used to evaluate or test the quality of electronic images produced by window card scanners. GB/T 19475.1-2004 Micrographic technology - Methods for measuring the quality of images produced by window card scanners - Part 1: Characteristics of test images GB/T19475.1-2004 Standard download decompression password: www.bzxz.net
This part of GB/T19475 specifies the characteristics of test images used to evaluate or test the quality of electronic images produced by window card scanners.
class="f14" style="padding-top:10px; padding-left:12px; padding-bottom:10px;"> GB/T19475-2004 "Micrographic technology - Methods for measuring the quality of images produced by window card scanners" consists of two parts:
- Part 1: Characteristics of test images;
- Part 2: Quality requirements and control.
This part is the first part of GB/T19475, and is modified to adopt ISO11698-1:2000 (Micrographic technology - Methods for measuring the quality of images produced by window card scanners - Part 1: Characteristics of test images) (English version).
The main technical differences between this part and ISO11698-1:200:
- The national standards GB/T6159.1-2003, GB/T6159.4-2003, The relationship
between GB/T6159.5-2000, GB/T6159.6-2003 and GB/T10609.4-1989 and the
corresponding international standards in ISO11698-1:2000 is modified adoption or non-equivalent.
This part makes the following editorial changes to ISO11698-1:200:
- delete the foreword in ISO11698-1:200 and add the foreword of this standard;
- replace the decimal point symbol with the decimal point symbol.;
- replace this part of ISO11698 with this part of GB/T19475,, or this part,,;
- The numbering of the test images shall be replaced by IIn, II, N, V, VI instead of 1, 2, 3, 4, 5, 6,
Appendix A of this part is an informative appendix.
This part is proposed and managed by the National Technical Committee for Standardization of Document Imaging Technology (SAC/TC86).
This part is drafted by the First Branch of the National Technical Committee for Standardization of Document Imaging Technology.
The main drafters of this part are Zhang Meifang, Zhang Leyuan, Cui Jiajia, Chen Jing, and Liu Peiping.
The clauses in the following documents become the clauses of this part through reference in this part of GB/T 19475. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, the parties to the agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this part.

GB/T 19475.1—2004
GB/T19475-2004 "Micrographic technology - Methods of measurement of image quality produced by window card scanners" consists of two parts: Part 1: Characteristics of test images;
Part 2: Quality requirements and control.
This part is the first part of GB/T19475, and is modified to adopt ISO11698-1:2000 "Micrographic technology - Methods of measurement of image quality produced by window card scanners - Part 1: Characteristics of test images" (English version). The main technical differences between this part and ISO11698-1:2000 are as follows: The national standards GB/T6159.1-2003, GB/T6159.4—2003, GB/T6159.5--2000, GB/T6159.6—2003 and GB/T10609.4-1989 cited in the normative reference documents of this part are adopted with modification or are non-equivalent to the corresponding international standards in ISO11698-1:2000. This part makes the following editorial changes to ISO11698-1:2000: delete the foreword in ISO11698-1:2000, add the foreword of this standard; replace the decimal point symbol "", with the decimal point symbol "", and replace "this part of ISO11698" with "this part of GB/T19475" or "this part"; the numbering of test images is replaced by I, II, III, V, И instead of 1, 2, 3, 4, 5, 6. Appendix A of this part is an informative appendix.
This part is proposed and managed by the National Technical Committee for Standardization of Document Imaging Technology (SAC/TC86). This part is proposed and managed by the National Technical Committee for Standardization of Document Imaging Technology The first branch is responsible for drafting. The main drafters of this part: Zhang Meifang, Zhang Leyuan, Cui Jiajia, Chen Jing, and Liu Peiping. GB/T19475.12004
The application of window card microfilm scanning in CAD and electronic information systems is very important. This part describes a series of contents for testing the image quality produced by window card microfilm scanning, which is used to evaluate the output quality of the window card scanning system. For instructions on how to use the test image, see Part 2 of GB/T19475. 1 Scope
Microfilm technology
Methods for measuring the quality of images produced by window card scanners Part 1: Characteristics of test images
GB/T 19475.1--2004
This part of GB/T19475 specifies the test image characteristics used to evaluate or detect the quality of electronic images produced by window card scanners.
2 Normative referenced documents
The clauses in the following documents become clauses of this part through reference in this part of GB/T19475. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this part; however, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this part GB/T6159.1-2003 Microfilm Vocabulary Part 1: General terms (ISO6196-1: 1993, MOD) GB/T6159.4-2003 Microfilm Vocabulary Part 4: Materials and packaging (ISO6196-4: 1998, MOD) GB/T6159.5-2000 Microfilm Vocabulary Part 5: Image quality, readability and inspection (ISO6196-5: 1987)
Microfilm Vocabulary Part 6: Equipment (ISO6196-6: 1992, MOD) GB/T 6159.6—2003
GB/T 10609.4--1989 Technical drawings Requirements for microfilm originals (neqISO6428:1982) IS0) 3272-1:2003 Microfilming of technical drawings and other drawing room documents Part 1: Operating procedures ISO12651:1999 Electronic images—Vocabulary 3 Terms and definitions
The terms and definitions defined in GB/T 6159.1—2003, GB/T 6159.4—2003, GB/T 6159.5--2000 and GB/T 6159.6--2003 apply to this part of GB/T 19475. 4 Test Image Specifications
4.1 Overview
Each test card shall be a windowed card with an embedded test image, or a film of the same size as the windowed card with a test image in the position corresponding to the card window, which can be correctly read when viewed from the film base. Note: The nominal value of film thickness is 0.18 mm. 4.2 Type I Test Images
Type I test images are used to evaluate or detect image center positioning, calibration, scanning range, line straightness, orthogonality and line width uniformity. Table 1 specifically lists seven Type I test images, each corresponding to a combination of format and positioning in Table 1. The Type I test image shall be constructed as follows (see Figure 1): a rectangle with five perpendicular lines dividing the long side into six equal parts, a straight line connecting the midpoints of the perpendicular sides, and oblique lines connecting the four corners of the rectangle and the midpoints of the four sides;
a rectangle slightly larger than the above rectangle and concentric with the above rectangle, surrounded by thick dotted lines, whose inner boundary represents the image range of the microfilm to be scanned by the scanner, and the size specifications are consistent with the size specified in ISO3272-1:2003, and are reduced by the specified ratio 1
GB/T19475.1-2004
;
-4 mm scale, with scales from -2 mm to +2 mm, at intervals of 0.1 mm and 1 mm, located on the extension lines of the four right-angled sides of the inner rectangle.
As shown in Figure 1, the points on the four sides of the inner rectangle are represented by letters A to H, and the intersection of diagonals AC and BD is represented by letter O. The sizes of AB and AD shall comply with the provisions of Table 1, and the reduction ratio suitable for microfilm images is given. Table 1 Type I test image
Test image
4.3 Type II test image
AB size/mm
AD size/mm
Type II test image is shown in Figure 2, which is used to evaluate or detect resolution. It includes five test targets, one in the center and one in each of the four corners. Each test target should be composed as follows:
-Two radial star patterns, which means that the square contains radial patterns with equal angular frequencies and three concentric circles. The three concentric circles indicate that the frequency of the distribution of radial lines is 2, 4, and 8 line pairs per millimeter; two sets of ISO2 test patterns, the spatial frequency of the pattern is within the range of 84300 line pairs per millimeter; four radial fan patterns.
The size of the test target should ensure that they do not overlap and the elements in it can be identified. The frequency mark should be added to the appropriate position of the target. 4.4 Type II test images
There are five types of Type III test images, which are different formats from A0 to A4. Type III test images are shown in Figure 3 and are used to evaluate or detect the performance of the scanner in scanning different line widths. The number of test targets it contains should comply with the provisions in Table 2. Each test target should consist of three groups of patterns, each of which contains two groups of lines, the spacing between the two groups of lines is equal and perpendicular to each other, and the line width is one of 0.30 to 1.0 as specified in GB/T10609.4-1989. One should be a positive pattern group, containing seven patterns, with equal line spacing and line width; one should be a positive pattern group, containing six patterns, with the line spacing being at least five times the line width; and one should be a negative pattern group, containing six patterns, with the line spacing being at least five times the line width; the test targets should be arranged regularly to cover the range of microfilm images as much as possible. Table 2 Number of test targets
Number of targets
4.5V-type test image
GB/T19475.1—2004
IV-type test image is shown in Figure 4 and is used to evaluate or detect the optical focusing performance of optical scanners. It should consist of five test targets and lines on the bottom plate, half of which are horizontal lines and the other half are vertical lines. The spatial frequency of each line is 50 line pairs per millimeter. Each target plate consists of two patterns, each of which contains four groups of lines with gradually increasing spatial frequencies, and the line groups of each pattern are marked with letters A to J, presenting an incomplete rectangular shape with the axis marked with letters as the axis of symmetry. The spatial frequency of the line group is determined by Table 3. The long axis angle of the two patterns is 45°Table 3
Spatial frequency of the line group
Line pairs per millimeter
4.6V-type test image
The V-type test image is shown in Figure 5 and is used to evaluate or test readability. It should contain two groups of character strings. The aspect ratio, line density and style of the character strings should be similar to the characters used to write information on technical drawings. The character sizes used should be arranged starting from the smallest zero-level character in the character system, and the size of each row of characters in each group increases by 2 levels from top to bottom. One group includes character strings with even character sizes from 0 to 62, and the other group includes odd character strings from 1 to 63. The character rows should contain letters arranged in alphabetical order and Arabic numerals arranged in order of size as long as the line length allows. Each character row should be annotated with a numeric symbol indicating its size after the first alphabetic character. 4.7 User template
In some cases, the user can customize a user template based on the image characteristics of the actual application. Appendix A provides a detailed description of a user template suitable for technical drawings. 237mm(1t15)
Note: In the dimensions AB and AD, 1:15 indicates the reduction ratio used to make the test image. This ratio is very important because the actual size on the film can only be known when the reduction ratio is known. Figure 1 Type I test image (seventh example) (used to check image center positioning, proportion, shooting range) 3
GB/T19475.1—2004
The displayed value is the precise resolution of the target plate in lines per millimeter rrr
Detailed enlargement of the test pattern
2 Type II test image (used to check resolution) Figure 2
Figure 3 Type II test image (used to check line width) Back
Horizontal line 50 lines per millimeter||tt ||Even size from 0 to 62
Enlarged detail of test target
V-type test image (for checking focusing performance)64 characters, each size is one from 1 to 64Odd size from 1 to 63
A56BCdEF
A58BCDEFGHIJKLMNOPQRS
6OBCDEFGHIJKLmnOPQRS
FGHIJKLMnOPQRS
GB/T 19475.1--2004
Vertical lines 50 line pairs per millimeter
JKLmnOPORs
KIMnOe
FGHIJKLMnOPQRST
DEFGHIJKLMNOPQRS
6 3 R 0 7
Figure 5 V-type test image (for checking readability) 5
GB/T 19475.1—2004
A.1 Overview
Appendix A
(Informative Appendix)
User-defined test target
The functions of some scanners, such as image enhancement, perform particularly well when scanning ordinary technical patterns, but will distort the targets given in the main text of this standard. For this reason, it is helpful to use one or more representative images formed by ordinary microfilms as test images to help make a subjective assessment of the scanner's performance. The Type I test images are designed for this purpose. Users can use their own test images if they wish. If more than one type of image is to be scanned, such as both positive and negative images, additional test images can be used. Type A,2M test image
Type V test image is an A1-sized technical drawing that meets the GB/T10609.4-1989 standard, photographed in accordance with the provisions of ISO3272-1:1983. The image should include a variety of typical features that can be used to quickly and subjectively evaluate the scanner's performance. In Figure A.1, examples of these features have been circled and labeled as follows: A—light pencil line drawing;bzxZ.net
B—closely spaced characters;
C—filled space closely spaced characters,
D—light hatching;
E—mixed ink and pencil writing; F—dense lines;
G—center mark of the hole
GB/T 19475.1--2004
1 96968
dooo o tiha?
ora he woe.
Aiyingshi
653 253
Example of V-type test image, engineering drawing
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