DEVICE FOR PROCESSING COMPRESSED PICTURE

摘要

PROBLEM TO BE SOLVED: To suppress the noise of an output signal by operating an arithmetic operation, including an optimal restoration equation related with a block noise and a mosquito noise based on a decoded discrete cosine transformation(DCT) coefficient, and calibrating the obtained value. SOLUTION: When an image is intra-encoded (an I-picture of JPEG and MPEG), this algorithm can directly restore the image by using a decoded DCT coefficient. All encoding processing is converted into the DCT coefficient at first for inter-frame encoded video signals. A predication signal is converted into the DCT coefficient by a DCT part (FDCT) 10. The decoded DCT coefficient (difference) is added to the signal by an adder 16. Then, an artifact (block noise or mosquito noise) is removed by a reproduction algorithm (a reproducing part 18). Thus, an arithmetic operation including an optimal restoration equation for a block noise and a mosquito noise can be performed based on the decoded DCT coefficient, and the obtained value is calibrated.