Partial expansion method of encoded images and image processing apparatus

摘要

A method and apparatus for partially up/downscaling an image encoded on a macroblock basis. The method and apparatus performs operations of: storing the encoded image; creating map data from bitstream of the encoded image to decode at least one macroblock of the encoded image, creating a shrunken image of a predetermined size based on resolution of a display device, storing the map data and the shrunken image so as to relate with the encoded image; outputting the shrunken image related with the encoded image to be displayed based on a control request received from an input device; determining at least one macroblock to be decoded based on a display area of the shrunken image; partially decoding the encoded image for the determined macroblock using the map data; and outputting to the display device, the image data of the display area of the partially decoded image.

主权项

1. A method for partially expanding an image encoded on a macroblock basis utilizing a computer, comprising the following steps of:
(a) storing, in a storage device of the computer, the encoded image, map data created from bitstream of the encoded image, the map data being utilized to decode at least one macroblock of the encoded image, and a shrunken image created from the encoded image so as to relate the map data and the shrunken image with the encoded image; (b) outputting, to a display device, the shrunken image related with the encoded image to be displayed based on a control request received from an input device; (c) determining at least one macroblock to be decoded based on a display area of the shrunken image; (d) partially decoding the encoded image for the determined macroblock using the map data; and (e) outputting to the display device, the partially decoded image of the display area so that the shrunken image displayed on the display area is replaced by the output partially decoded image.