Hyundai Electronics Industries Co. Ltd.

Seong-Jun Oh

Joo-Hee Moon

Jae-Kyoon Kim

Sung-Moon Chun

An object based video information coding apparatus and method for an MPEG-4 system compresses image data without reducing image quality by converting motion-incompensable objects using image data blocks. The method includes the steps of i) separating moving and non-moving background imagery from an input image; ii) selecting motion-compensable objects and motion-incompensable objects from the moving imagery; iii) separating motion information and shape information from motion-compensable objects; iv) separating shape information and image information for motion-incompensable objects; v) dividing motion-incompensable object into N.times.N blocks; vi) discrete cosine transforming pixels in the N.times.N blocks using an N.times.N discrete cosine transform. In one embodiment, the pixels of the motion-incompensable object not in the N.times.N blocks are differential pulse code modulated. In another embodiment, the motion-incompensable object is first divided into 8.times.8 blocks. The remaining pixels are then divided into 4.times.4 blocks.

Object-by information coding apparatus and method thereof for MPEG-4

An object based background information coding apparatus and method for an MPEG-4 system codes background images for effectively compressing image data corresponding to an MPEG-4 profile and for compensating the background information without errors. The apparatus includes a first region extraction circuit for extracting a changed region using a motion vector obtained from a current input image and an image inputted after the current image; a second region extraction circuit for extracting an uncovered region from the input image of the first region extraction circuit; an uncovered background extracting circuit for extracting uncovered background information from the changed region information extracted from the first region extraction circuit; a background memory storing region information of the first and second region extraction circuits; a surrounding value compensation circuit for compensating uncovered background information of the uncovered background extracting circuit for a surrounding value of the background memory; a background synthesizing circuit for uncovered background information compensated by the surrounding value compensation circuit and the background information of the memory; an error region extracting circuit for extracting an error region from uncovered background information synthesized by the background synthesizing circuit; a sampling circuit for sampling an extracted error region information; and a differential pulse code modulation circuit for differential-pulse-code-modulating uncovered error region information sampled by the sampling circuit.

Growing community of inventors

Seoul, South Korea

Seong-Jun Oh