ragraph once the translation is finished) //
====Uniformity====
**I. Concept of Uniformity**\\
**Uniformity** encompasses image luminance uniformity and image color uniformity.\\
**Luminance uniformity** refers to th
itions**\\
**1. Luminance Shading / Luminance Non-uniformity**\\
(luminance shading / luminance non-uniformity)\\
Gradual variation of the luminance signal component acro... he image field.\\
**2. Color Shading / Color Non-uniformity**\\
(colour shading / colour non-uniformity)\\
Gradual variation of the chrominance signal component across t
under no-light conditions.
- **Dark Signal Non-Uniformity (DSNU):** The spatial variation of dark signals a... et noise, dark current).
- **Photo-Response Non-Uniformity (PRNU):** The spatial variation of photo-responsi... temperature difference $T_d$).
**3. Spatial Non-Uniformity** \\
* Mandatory: Dark signal non-uniformity (DSNU), photo-response non-uniformity (PRNU), including full-f
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==== CMS Directional Uniformity ====
**1. Definition**\\
[[yanding:成像质量评价:测试用例:cm... 测试用例:cms测试用例:cms定义.png?500 |}}
**CMS Directional Uniformity** measures the luminance consistency of the same ... s such as ISO 16505 and GB 15084, the directional uniformity of CMS must meet the following requirements:\\
Standard directional uniformity range (±6° vertically and ±7° horizontally from t
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==== CMS Horizontal Uniformity ====
**1. Definition**\\
[[yanding:成像质量评价:测试用例:cm... :测试用例:cms测试用例:cms定义.png?500 |}}
**CMS horizontal uniformity** refers to the __luminance consistency across di... g:成像质量评价:测试用例:cms测试用例:不同区域.png?400 |}}
**The non-uniformity mainly stems from two aspects:**\\
- **Imaging en... oints to the maximum luminance for CMS horizontal uniformity should be less than 35%. The calculation formula
ding true and natural color reproduction. |
| **Uniformity** | {{ :yanding:成像质量评价:工具:图卡:均匀性1.png |}}{{ :ya... :图卡:均匀性2.png |}} |Used to evaluate the luminance uniformity, color uniformity, white balance, dead pixels, etc., of the imaging system;\\ \\ **Common quantitative metric... a reflectance of 70%, suitable for CMS luminance uniformity (i.e., lateral uniformity) testing. |
| **OECF*
cturing process, including: DSNU (Dark Signal Non-Uniformity) and PRNU (Photo Response Non-Uniformity).\\
**DSNU (Dark Signal Non-Uniformity):** Originates from the inconsistency in the dark current generation r... ely dark conditions.\\
**PRNU (Photo Response Non-Uniformity):** Originates from slight differences in photoel
mended value is 118)__. __The backlight luminance uniformity shall be no less than 90%, and the amplitude vari... }}]]
While ensuring excellent color rendering and uniformity, this light box also achieves an industry-leading... al-to-noise ratio, dynamic range, luminance/color uniformity, and LED flicker performance of digital cameras.
... mended value is 118)__. __The backlight luminance uniformity shall be no less than 90%, and the amplitude vari
ons for material selection are light transmission uniformity and durability.\\
**1. Photographic Film**\\
{{ ... g?450 |}}
**Advantages:** Good light transmission uniformity, ensuring uniform imaging brightness and color; l... ed with rigid materials allows light transmission uniformity to be achieved through structural optimization, a
, this method is sensitive to focus, illumination uniformity, and noise, and often requires multi-frame averag... ed by target fabrication accuracy and image-plane uniformity, and its absolute measurement accuracy is slightl
d be checked before measurement.
(2) Light source uniformity: The luminance produced by the test light source ... m as possible, and both the average luminance and uniformity must be recorded.
(3) Stray light elimination: Pr
uniformity @en:yanding:image_quality_evaluation:test_cases:camera_test_cases
