Fig. 3
From: In-pixel foreground and contrast enhancement circuits with customizable mapping
In-pixel foreground enhancement (IPFE) circuit. (a) Schematic of the proposed circuit. Here, X2 and PTM form a p-type HyperFET. (b) Normalized output of the circuit between 0-255 levels (for 8-bit encoding) vs. the voltage drop at the PD node. (c) Low-contrast image without IPFE, where many features are not visible (d) Effect of IPFE on the image; here, features are visible. (e) Histogram of the low-contrast image, which shows a narrow distribution of grayscale levels. (f) Histogram of the image with IPFE. Here, the distribution is much broader.
