17-5 Arithmetic Coding of Color Quantized Images Based on Prediction in a RGB Color Space

Abstract

This paper proposes an efficient lossless coding method for color quantized images each of which consists of an array of indices and corrsponding RGB values of representative colors. In the conventional methods, predictive coding techniques developed for lossless image coding are often applied to the array of indices. On the other hand, our method directly predicts a 3D position of each index in a RGB color space to accurately estimate its occurrence probability.