This standard specifies the format, specifications, requirements, inspection methods and inspection rules of digital photos used in the production of resident identity cards. This standard applies to the development and construction of the acceptance, production and application systems of resident identity cards. GA 461-2004 Technical requirements for digital photos used in the production of resident identity cards GA461-2004 Standard download decompression password: www.bzxz.net

All technical contents of this standard are regulatory. Appendix A of this standard is a normative appendix.
This standard is proposed by the Public Security Administration Bureau of the Ministry of Public Security. Foreword
This standard is under the jurisdiction of the Computer and Information Processing Standardization Technical Committee of the Ministry of Public Security. The Public Security Administration Bureau of the Ministry of Public Security is responsible for the interpretation of this standard. The drafting unit of this standard: the First Research Institute of the Ministry of Public Security. The main drafter of this standard: Jiang Cai.
GA 461—2004
1 Scope
Digital photos for resident identity cards
Technical requirements
This standard defines the style specifications, requirements, inspection methods and inspection rules for digital photos for resident identity cards. This standard applies to the acceptance, production and development and construction of application systems for resident identity cards. 2 Normative references
GA 461—2004
The clauses in the following documents become clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. ISO DIS10918-1CCITT Construction T.81Digital compression and coding of continuous-tone still images3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Digital photos for ID cardsDigital image files of the recent color front-facing bareheaded head portraits of applicants for ID cards (referred to as digital photos). 3.2
Test sample chart
A chart specially designed and produced for testing clarity, color, tone and other technical indicators (standard sample, specifications see Appendix A). 3.3
Sample chart digital photo Without changing the photographic environment, camera parameters, and operating procedures, place the test sample chart as the subject in the photographed position and take the resulting photo in the same way as taking a normal photo of a person. 4 Style, specifications and requirements
4.1 Digital photos
4.1.1 Style
See the figure for the style of digital photos
4.1.2 Specifications
338 pixels (width) × 441 pixels (height), resolution 350pi4.1.3 Color mode
24-bit RGB true color,
4.1.4 Compression method
Use IEC compression technology, the compression quality is called 70-generally the file capacity of the photo is between 14k and 2 bytes), in line with the requirements of 1S0DIS 1O918-1.
GA 4612004
4.1.5 General requirementsWww.bzxZ.net
Pixel - 2 pixels
Not less than
207 pixels
3 pixels
207 pixels: 1 pixel
Figure 1. Style of digital photo for resident identity card. Residents who usually wear glasses should wear limited glasses. The portrait must be clear, rich in layers, natural in expression, and without obvious distortion: 4.1.6 Size and position of the head portrait
The portrait should be horizontally centered in the rectangular frame of the photo, with a face width of 207 pixels ± 14 pixels, the hairline on the top of the head should be 7 pixels to 21 pixels away from the top edge of the photo, and the distance between the eyes and the bottom edge of the photo should be no less than 207 pixels. When the distance between the hairline on the top edge of the photo and the distance between the eyes and the bottom edge of the photo cannot meet the above requirements at the same time, the distance between the eyes and the bottom edge of the photo should be guaranteed to be no less than 207 pixels. In special cases, part of the hair that stands too high can be removed. 4.1.7 Background and frame
White background, no inverted frame.
4.2 Standard digital photo
4.2.1 Color deviation
The deviation of the three primary colors R, G, B of the No. 11 gray card of the standard digital photo should not be greater than 15, the deviation of the No. 5 color block from the standard value 2EA B is less than 10 (standard value: A=12.51, B\=10.39), and the deviation of the No. 6 color block from the standard value △EA*B\ is less than 10 (standard value: A*14.88.B*-12.86).
4. 2. 2 Grayscale deviation
The brightness value [（R+G+B)/3] of the No. 1 gray card of the standard digital photo is less than 60. The brightness value [（brightness+B)/3] of the No. 2 gray card of the standard digital photo is 100~15. The brightness value of the gray plate of the standard digital photo [(R+G+B)/ is 160+15. The brightness value of the standard digital photo plate 4 [(R!G+B)/3] is 200±15. 4.2.3 Clarity
The red arc line of the standard digital photo should be clear and discernible. 5 Inspection method
5.1 General requirements and background frame
Open the digital photo file to be tested. Daily observation inspection. It should meet the requirements of 4.1.5 and 4.1.: 5.2 Portrait size and position
Open the digital photo file to be tested, read and read the relevant data, which should meet the requirements of 4, 1, 6. 5.3 Color deviation
Open the standard digital photo file to be tested, and read the hue value (regional average) of plates 1-4 and color block 5 respectively, which should meet the value range required by 1.2.1.
5. 4 Grayscale deviation
GA 461-2004
Open the digital photo file of the standard sample to be tested, and read the brightness values ​​(regional average) of gray plates No. 1 to 4 and color block No. 5 respectively. They should comply with the value sample model specified in 4.2.2.
5. 5 Clarity
Open the digital photo file of the standard sample to be tested, and observe the resolution of the fan-shaped radiation pattern through H measurement. It should comply with the requirements of 4.2.3. 6 Inspection rules
6.1 Inspection classification
The inspection of this standard is divided into type inspection and operation inspection. 6.2 Type inspection
6.2.1 Type inspection should be carried out in the following cases: a) When a new system is built, the system is migrated or resumed after being out of service for more than one month; b) When a digital camera or light is replaced with a new brand or model or put back into use after an overhaul; when a scanner is replaced with a new brand or model or put back into use after an overhaul; when continuous unqualified items related to system performance appear in the running inspection digital photos or unqualified items appear in the standard sample digital photos; d) When the superior department or quality supervision agency makes an inspection request; When the system working conditions change significantly due to other reasons. Inspection sampling
The number of samples to be drawn is 10, including 8 digital photos and 2 standard sample digital photos. 6.2.3 Inspection Items
The inspection items for digital photos are 4.1, 5, 4.1.6, 4.1, 7. The inspection items for standard digital photos are 4.2.1.4.2.2, 4.2.3.6.2.4 Judgment
If any item does not meet the requirements, the type inspection is judged to be unqualified. 6.3 Operation Inspection
6.3.1 During the operation of the digital camera system or scanning system, the output photos should be subjected to operation inspection. 6.3.2 General requirements, background frame and head portrait ratio inspection items are inspected one by one according to 4.1.5, 4.1.6, 4.1.7. If any item does not meet the requirements, it is judged to be unqualified. If the unqualified rate exceeds 5%, type inspection should be implemented. 6.3.2 During the operation of the system, a digital photo of the standard sample shall be taken regularly and tested daily according to 4.2.1, 4.2.2 and 4.2.3. If any item does not meet the requirements, the batch shall be judged as unqualified and type inspection shall be carried out. 3
GA 461—2004
A.1 Style and specifications
Standard test card style, specifications are shown in Figure A.1. Appendix A
【Normative Appendix】
Standard test card
Figure A.1 Standard test card
A,2 Technical integers and indicators of standard test card
A,2.1 The standard test card is printed on non-reflective paper material in January. The color blocks A,2.21 to A,2.4 are neutral with optical densities of 1.50, 1.05, 0.70 and 0.44 respectively. GA 461—2004
A.2.35 is a color block representing light skin with CIF (1931) xyY=(0.377.0.345.3.8); and 6 is a color block representing dark skin with CIE [193t) xyY=(0.4000.350, 10.1>. Accuracy of error: AEL\A'B'≤2.
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