会议论文
会议论文
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Acceptance levels for image quality factors
Determining the lowest light level at which a camera still delivers acceptable image quality requires well‑defined tolerance thresholds for all relevant factors. This paper presents a psychophysical study comparing expert and non‑expert evaluations across photographic and security‑camera use cases to establish application‑specific acceptance limits. The results provide a foundation for understanding how image quality degrades as light decreases and where compensation mechanisms reach their limits.
Learn moreISO TC42 代表性肤色选择流程
ISO第42技术委员会（摄影）下属多个工作组的成员已开始着手探讨一个重要议题，即为各种摄影应用中的图像质量测试提供关于应使用何种肤色的指导。
Learn moreHDR Printing, how to produce and display extreme contrast levels
Determining the lowest light level at which a camera still delivers acceptable image quality requires well‑defined tolerance thresholds for all relevant factors. This paper presents a psychophysical study comparing expert and non‑expert evaluations across photographic and security‑camera use cases to establish application‑specific acceptance limits. The results provide a foundation for understanding how image quality degrades as light decreases and where compensation mechanisms reach their limits.
Learn moreMeasurement of Noise Equivalent Quanta (NEQ) Using the Dead Leaves Technique
Noise Equivalent Quanta (NEQ) is an objective Fourier metric which evaluates the performance of an imaging system by detailing the effective equivalent quanta of an exposure versus spatial frequency.
Learn moreInfluence of the Light Source on the Image Sensor Characterization according to EMVA 1288
Machine‑vision systems rely on accurate sensor characterization, yet the EMVA 1288 standard’s use of monochrome illumination raises important questions about real‑world comparability. This study examines how different light sources influence key measurement results and shows that only quantum efficiency and related parameters are affected. Using broadband illumination can therefore offer more practical insight into application‑specific performance.
Learn moreVCX Version 2023
The latest transparent and objective mobile phone test scheme
Learn moreVCX Version 2020 - Further development of a transparent and objective evaluation scheme for mobile phone cameras
VCX or Valued Camera eXperience is a nonprofit organization dedicated to the objective and transparent evaluation of mobile phone cameras.
Learn moreCorner cases and limitations using a DOE based geometric camera calibration
Diffractive‑optics–based geometric camera calibration has opened the door to highly compact, easy‑to‑use setups capable of capturing precise dot‑grid patterns from virtual infinity. This paper explores the method’s untapped potential, from extreme wide‑FOV calibration to large entrance pupils and automotive distances, while addressing key limitations such as infinity‑only measurement and chromatic constraints. Several practical solutions are presented to extend the technique beyond distortion measurement toward richer system characterization.
Learn more数码相机Resolution计量学在描述降噪伪影方面的差异
数码相机的降噪功能会通过削弱低对比度细节（通常表现为纹理模糊）而显著影响图像质量。本研究对比了不同的SFR测量方法，结果表明自适应滤波会根据测试目标的不同产生不同的结果。通过分析各方法之间的差异，本研究旨在更准确地描述降噪对特定空间频率带的影响。
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