APPARATUS FOR ENCODING IMAGES

摘要

PURPOSE: An apparatus for encoding images is provided to reduce a prediction error due to differential pulse coded modulation by using a perceptual color tolerance. CONSTITUTION: A frame input unit(11) generates a current original frame, a forward original frame, a forward restored frame, and a predicted frame from the current original frame and the forward restored frame by differential pulse width modulation. A perceptual color tolerance decider(12) decides a perceptual color tolerance of each pixel of the current original frame. A prediction error generator(13) generates a prediction error between the predicted frame and the current original frame inputted from the frame input unit. A perceptual prediction error comparator(14) compares the prediction error with the perceptual color tolerance of each pixel. A perceptual prediction error generator(13) generates a perceptual prediction error according to the result of the comparison. A decoder(16) restores the encoded frame by using the perceptual prediction error and the predicted frame.