Apparatus and method for image restoration using high-pass filter

The image decoding apparatus and method using a high-pass filter is provided. Divides the received original image, the image dividing unit into a plurality of input image block. Edge detector detects an edge from each of the image blocks. Block image classification section classifies the image block into a plurality of groups based on the number of edges included in the respective block image. High-frequency image generation unit generates the high-band high-frequency image composed of high frequency components extracted from each image block by-pass filter. Image quality improving part of the weight to the pixel value of the pixel to be given differently set weights for each group belonging to the block image with the pixel values ​​of the pixels constituting the high-frequency images corresponding to each block image, the blocks images given pixel value by summing the results to produce an image. According to the invention, it is possible by using, depending on the number of the edge blocks included in the image give different weights to the high-frequency component in the summing block image to improve the image quality of the restored image with minimal image degradation caused by the ringing phenomenon. Image block, the edge, high-frequency components, the weight