TEST METHOD OF LUMINANCE DYNAMIC RANGE FOR HDR CAMERA WITH CMOS IMAGE SENSOR
ChangHui Ye, JeongAh Hwang, Dong-Hoon Lee, Seongchong Park · PROCEEDINGS OF the 29th Quadrennial Session of the CIE · 2019
We present a test method of luminance dynamic range for a CMOS-based HDR camera, which provides a practical solution with a cost-effective instrumentation.The method is based on the separate measurements of the relative linearity and the absolute scaling.The relative linearity measurement is performed in the illuminance mode for the CMOS image sensor without lens system by using a collimated beam.The absolute scaling measurement is performed for the camera including the lens system against an integrating sphere source at a moderate luminance level.Combining these two measurements, we obtain a linearity plot of the camera reading signal against object luminance, from which the saturation luminance and the noise equivalent luminance are determined.The method is demonstrated for a HDR camera with a dynamic range of 20,000:1.