Fig. 2
From: A histogram specification technique for dark image enhancement using a local transformation method
The different steps of the proposed method. a Input image histogram. b Histogram of edge pixels. c Histogram of non-edge pixels. d After applying smoothing in (b). e After applying smoothing in (c). f After applying the Segment Identification, Segment Relocation and Intra Segment Transformation on the histogram in (d). g After applying the Segment Identification, Segment Relocation and Intra Segment Transformation on the histogram in (e). h Desired histogram after merging the histograms in (f) and (g). i Output image histogram