Fig. 5
From: In-pixel foreground and contrast enhancement circuits with customizable mapping
Design-phase customization of contrast enhancement mode. (a) The input vs. output curves of the pixel model for different resistance values of LRS. The inset shows the curves before normalization. (b–d) Histogram and images (inset) after applying the varied pixel models. (e) The curves for different resistance values of HRS (the curves before normalization have not been shown because the maximum and minimum values are the same for all curves, even prior to normalization). (f–h) Histogram and images (inset) after applying the varied pixel models. (i) The curves for different IC−HLT values. (j–l) Histogram and images (inset) after applying the varied pixel models. The effect of the CE pixel models on other images is illustrated in (m–t). (m), (q), (o), and (s) display the histograms without contrast enhancement (CE) pixels, with the insets showing the corresponding images. (n), (r), (p), and (t) present the histograms with CE pixels, and the insets show the effect on the corresponding images.
