Fig. 4
From: In-pixel foreground and contrast enhancement circuits with customizable mapping
Contrast enhancement mode. (a) The input vs. output curve of the pixel model for contrast enhancement (CE) mode. Stage 1 and Stage 2 are due to HRS and LRS, respectively. Ax, Ay, Bx, and By are tuned to achieve required contrast enhancement curve or input vs. output characteristics of our pixel model. (b) Image after applying the CE pixel model. (c) Histogram of the image of (b).
