METHOD FOR ENCODING AND DECODING IMAGE USING TRANSFORM, AND APPARATUS THEREOF

摘要

The present invention relates to an apparatus and a method to encode and decode an image. According to the present invention, the method to encode an image comprises: a step of converting a residual signal into a conversion factor by applying a Harr transform to the residual signal; a step of quantizing the conversion factor; a step of scanning the quantized conversion factor based on the position where the quantized conversion factor exists; and a step of performing entropy coding of the scanned conversion factor. In the converting step, the conversion is performed by applying the Harr transform where some kernels in the lower end are set to 0.