Color image coding based on the colorization algorithm using multiple resolution images

This paper proposes a representative pixels (RP) extraction and colorization algorithm for the colorization-based digital image coding. In order to achieve a low computing time and to reduce the amount of information to represent the RP, the proposed algorithm uses the multiple resolution images obtained by simply multiple downsampling. Numerical examples show that the proposed algorithm extracts the RP and colorizes the luminance image fast and effectively.