Gray image colorization based on general singular value decomposition and YCbCr color space

Abstract EN

Colorization the gray image is the process of adding colors to the gray image without prior knowledge about the real colors of image.

in general, the term and process of colorization is an active area of many researches, and challenging for many researchers.

in this paper, we suggested new method for automatic colorizing gray image depending on general singular value decomposition (GSVD) algorithm with YCbCr color space.

up to our knowledge, this is the first work uses the GSVD algorithm in this field.

We suggested using reference color image.

both reference image and gray image transformed to YCbCr color space (gray image converted to 3D image by redundant the gray image three times).

GSVD is applied for each block from gray image with all blocks from reference image (converted to gray image) to find the best blocks can be combined together from both reference image and gray image.

the (Y, Cb, Cr) from YCbCr color space of gray and reference images combines (Y channel corresponding to block of gray image combine with (Cb and Cr) channels from block corresponding to reference image).

this process continues for all blocks of gray image.

finally, the resulted image (YCbCr image) is transformed to RGB image (colorized image).

results are promising and dependable.