Colour Image Contrast Enhancement by Histogram Equalization
A colour image Enhancement by the histogram equalization process is as same as a grayscale image enhancement by histogram equalization except that colour space conversion technique included. The input colour image has R (Red),G (Green) and B (Blue) components which forms rectangular or cube coordinate colour space. When doing histogram equalization on the input image, It has to apply histogram equalization to each components RGB colour space consequently, the enhanced image object's original colour will vary. The HSV colour space has H (Hue),S (Saturation) and V (Value) components which forms circular or spherical coordinate colour space. When doing histogram equalization on the HSV colour space, It has to apply histogram equalization to only V component of HSV colour space and the resultant enhanced image object's original colour is preserved. Test Image 1 - dining table Test Image 1 - Histogram of original and Enhanced image ...