9 November 2010 Measurement for opto-electronic conversion functions (OECFs) of digital still-picture camera
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Abstract
The opto-electronic conversion function (OECF) is defined as relationship between input luminance and digital output levels for an opto-electronic digital image capture system. It is a fundamental parameter to evaluate the performance of digital still-picture camera. An experiment device was set up to measure OECFs by using test charts with twelve neutral patches stepped in different visual density increments and a integrating sphere uniform illuminator. To determine the camera OECFs, images of the test charts were captured under controlled conditions for computer to calculate. For each trial, the mean digital output level shall be determined from a 64 by 64 pixel area located at the same relative position in each image. Several digital still-picture cameras were selected as test samples and their OECFs were different under a larger range of illumination. Besides, the dynamic range, incremental gain and SNR also have been calculated using the OECF test charts images data.
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Hou-Ping Wu, Ping Li, Yu Wang, Ying-Wei He, Cheng Li, "Measurement for opto-electronic conversion functions (OECFs) of digital still-picture camera", Proc. SPIE 7850, Optoelectronic Imaging and Multimedia Technology, 78501D (9 November 2010); doi: 10.1117/12.869364; https://doi.org/10.1117/12.869364
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