Color Enhancement in Endoscopic Images Using Adaptive Sigmoid Function and Space Variant Color Reproduction

Table 4

Category 2: Enhancement of grayscale WLI images (here, no original color image is available, so color image from similar location of the GI tract is used as theme image).

Number	Input original image (grayscale)	Enhanced grayscale image	Theme image	Output enhanced color image
1
2
3
4