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THE METHOD OF EFFICIENT CODING OF COLOR IMAGES UNDER THE CONDITION OF PERMISSOBLE AND FORBIDDEN VALUES OF COLOR GAMUT
Anastasiya Y. Kudryashova, Moscow Technical University of Communications
and Informatics, Moscow, Russia, asykka@bk.ru
Abstract
In modern communication systems, when transmitting a color image, the issues of ensuring the required transmission quality are highly relevant. In turn, intercompatible coding is an important factor in ensuring the necessary noise immunity of communication systems. When transmitting signals, several color models are used, for example, RGB or YCrCb. At the same time, an important role is played by the fact that the color gamut has several forbidden values that can be discarded when encoding the transmitted image. R, G and B channels use gamma correction, which is not optimal from the point of view of minimizing the number of quantization levels when visually observing an image, and on the other hand, these models do not have the same contrast, i.e. change, for example, color tone or saturation at a certain value will differ significantly depending on the choice of the initial values of the coordinates of the selected color. The paper proposes to optimize the choice of code combinations for color image transmission. An algorithm for estimating the efficiency of coding a color image is proposed, taking into account the derivation from acceptable values of chromaticity, the estimation algorithm takes into account indicators of risks or distortions when coding with a binary code, and also takes into account the types of errors that occur in a digital signal. This approach allows us to identify more and less efficient methods for coding a color image. It was found that, depending on the type of errors in the digital signal, different coding options provide significantly different distortions in the restored signal.
Keywords: binary code, effective coding, error-correcting coding, gamma-correction, RGB signal.
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