Television – Bandwidth reduction system – Data rate reduction
Patent
1995-03-16
1998-09-01
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
348420, 382233, H04N 730
Patent
active
058017763
ABSTRACT:
The present invention provides an image decoding and reconstruction system for successively reading out and decoding compression video data constituting one screen page and reconstructing an image with a memory of a small capacity. The system of the invention divides an image of one screen page into 8.times.8-pixel blocks, compresses video data by discrete cosine transform, successively reads data in the unit of a 2.times.2 matrix of the 8.times.8-pixel blocks, and stores the video data along horizontal scanning lines in one of two memories while reading other video data previously stored along the scanning lines out of the other memory. The invention also provides an interblock distortion removal filter for eliminating interblock distortions due to orthogonal transform. The filter eliminates interblock distortions generated on the boundary between vertically adjacent blocks in each 16-line data area before writing video data in the memory, and eliminates distortions between horizontally adjacent blocks in the data area when reading video data out of the memory. The filter also eliminates interblock distortions on the boundary between adjacent 16-line data areas by reading last line data of a first block out of one memory while reading first line data of a second block out of the other memory.
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Ishikawa Teruhisa
Miyane Toshiki
Tamura Tsuyoshi
Au Amelia
Seiko Epson Corporation
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