[OPTICAL REVIEW Vol. 5, No. 6 (1998) 358-362]
Influence of Non-Linear Image Processing on Spatial Frequency Response of Digital Still Cameras
Sharp Corporation, Information Systems Product Development Labs., 492, Minosho-cho, Yamatokoriyama, Nara, 639-1186 Japan
(Received August 11, 1998; Accepted September 28, 1998)
The spatial frequency response (SFR) for a digital still camera is affected by non-linear image processing. We analyze the influence of image enhancement processing and gamma correction on SFR characteristics by varying the edge chart contrast. SFR expressions depending on the chart image contrast are proposed, as is a measurement method of resolving power based on the slanted edge.
Key words : spatial frequency response, image processing, image enhancement, non-linear processing, gamma-correction, digital camera, resolving power, slanted edge