This paper proposes a representative pixel (RP) extraction algorithm and chrominance image recovery algorithm for\nthe colorization-based digital image coding. The colorization-based coding methods reduce the color information of\nan image and achieve higher compression ratio than JPEG coding; however, they take much more computing time. In\norder to achieve low computational cost, this paper proposes the algorithm using the set of multiple-resolution\nimages obtained by colorization error minimizing method. This algorithm extracts RPs from each resolution image\nand colorizes each resolution image utilizing a lower resolution color image, which leads to the reduction of the\nnumber of RPs and computing time. Numerical examples show that the proposed algorithm extracts the RPs and\nrecovers the color image fast and effectively.
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