Image processing apparatus for preventing occurrence of moire in a reconstructed image

摘要

An image processing apparatus for image compression and decompression in which occurrence of moire in a reconstructed image is eliminated. The apparatus includes an encoder part for encoding an image into a compressed image, and a decoder part for decoding the compressed image into a reconstructed image. The encoder part includes an input part, a predictive coder, a subtracter, an ADCT encoder and a code memory. The predictive coder and subtracter act to remove high-frequency components prior to the calculation of the DCT coefficients by the ADCT encoder, thereby preventing moire in the reconstructed image.