Perceptual error processing in color image predictive coding device

摘要

A perceptual error processing method and an image coding device which include a generator for generating a predictive error image from the difference between an original image of a present frame to be coded and a restored image of a previous frame. A coder is provided for coding the predictive error image through discrete cosine transform 15 and quantization 17, a former 19 forms the coded predictive error image into a bitstream after performing variable length coding and a decoder decodes the coded predictive error image through inverse quantization 27 and inverse discrete cosine transform 29. A predictor predicts the restored image of the previous frame by estimating and compensating a movement from the decoded predictive error image and a perceptual error processor 39 reconstructs the predictive error image into a preceptual error image composed of only the predictive error generating the perceptual color difference by using a perceptual color difference look-up table, and applies the same to the coder. In this way, the coding efficiency of the image can be improved by enhancing the temporal and spatial correlation between the image data without causing deterioration of picture quality of the restored image by applying the human color perception to a conventional image coding method.