Colorization by Example Using Dual-tree Complex Wavelet Transform and Jseg

A novel and automated way to colorize gray images by giving an example color image is being proposed. Both images are partially segmented using unsupervised segmentation JSeg. Proposed methodology controls merging of segments in JSeg by analyzing histogram of gray image. Maximum fitting square patches are extracted from each segment in linear time. Some square patches are discarded to avoid error. Gray image and color image segments are matched using Dual Tree Complex Wavelet Transform. Colors between matched segments are transferred using simple mean and standard deviation. Remaining image is colorized using optimization. Experimental results performed show the advantage of automation.