Image signal compressing and expansion with filter means to elim

Details Image signal compressing and expansion with filter means to elim Image signal compressing and expansion with filter means to elim

1994-05-03

1996-10-08

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

H04N 724

Patent

active

055636624

ABSTRACT:
A raster/block converting section converts an input raster image signal into a block scan signal. A compressing/coding section selectively compresses and codes one of the block scan signal, converted by the raster/block converting section, and a differential signal. An expanding/decoding section expands and decodes the block scan signal compressed and coded by the compressing/coding section. A block/raster converting section converts the block scan signal, expanded and decoded by the expanding/decoding section, into a raster signal. A filter section filters the raster signal, converted by the block/raster converting section, to remove deformation at a boundary between blocks. A differentiating section substantially obtains a difference between the raster signal filtered by the filter section and the input raster image signal and supplies the difference as the differential signal to the compressing/coding section.

REFERENCES:
patent: 4754492 (1988-06-01), Malvar
patent: 4941043 (1990-07-01), Jass
patent: 5311310 (1994-05-01), Jozawa et al.
patent: 5351083 (1994-09-01), Tsukagoshi
patent: 5384849 (1995-01-01), Jeong
Malvar et al, "The LOT: Transform Coding Without Blocking Effects ," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 37, No. 4, Apr. 1989.

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