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In this paper, a prediction error preprocessor based on the Just Noticeable Distortion (JND) for the color image compression scheme is presented. The variance of prediction error signals the authors can reduce, the less objective distortion of the reconstructed image they can achieve at a given bit rate or the lower bit rate of the reconstructed image they can obtain at the same visual quality. Since the human visual perception to color visual signals has a limited sensitivity, any change below the visibility threshold cannot be detected by human eyes. They therefore use a new color JND estimator that is incorporated into the design of the prediction error preprocessor in the color image compression scheme.
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