IMAGE ENCODER AND DECODER BASED ON WAVELET TRANSFORM FOR CREATING THUMBNAIL IMAGE AND METHOD THEREOF

摘要

The present invention provides a wavelet transform based image encoder, a decoder and a method for generating a thumbnail image . To this end, according to the invention and tiles for tiling (Tiling) a predetermined manner to the original image, for each of the tiled image and performs a wavelet transform. And the wavelet transform to extract the LL image from each of the tiled image is performed, and performs the mapping range (Range mapping) the value for the color of each pixel of the extracted image LL. And when the range of color values for each pixel mapping process was completed, the mapping process by reconstructing range in accordance with the predetermined image is completed LL tiling scheme and generates a thumbnail image. Thus, the present invention is to easily create a thumbnail image in the case of decoding the encoded image, or if the wavelet in the decoder using the wavelet transform method in the encoder for encoding the original image using a wavelet transform method in the wavelet image into the original image The effect is that it allows you to