METHOD AND SYSTEM FOR CODING IMAGES USING HUMAN VISUAL SENSITIVITY CHARACTERISTIC

摘要

PURPOSE: A method and a system for coding images using human visual sensitivity characteristic are provided to compress a motion picture in consideration of luminance and color components to accomplish high-efficiency compression close to human visual sensitivity characteristic. CONSTITUTION: On the basis of color difference characteristic of each pixel value stored in the first color look-up table, a macro block constructing a video signal to be coded is classified into a predetermined texture classes using texture masking. The macro block is divided into four sub-blocks to obtain the average color of each sub-block, and the average colors of the sub-blocks are classified to decide the minimum value of classification values of the sub-blocks as a color class of the macro block. The classified classes are combined to assort final classes of the macro block. The quantity of generation of bits is predicted using bit models classified into quantizing intervals and dispersion values with respect to the classes of the macro block(44). A target bit by frames suitable for variable length coding is calculated(48). The actual quantity of generation of bits is controlled using the predicted quantity of generation of bits and the calculated target bit.