Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1995-07-28
1996-09-10
Metjahic, Safet
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348625, 382268, 382262, H04N 521
Patent
active
055550290
ABSTRACT:
A post-processing filter apparatus for use in an image signal decoding system, capable of improving the image quality of the system, comprises a memory for storing decoded image data of a current frame; a controller for assigning each pixel value included in the stored decoded image data as a target pixel value in sequence, the target pixel value representing the value of a target pixel to be filtered, and for producing information representing the position of the target pixel; a pixel region determinator for generating a selection signal representing whether or not the target pixel belongs to a boundary region of a block in the stored decoded image data by using the position information of the target pixel, wherein the boundary region denotes a region which includes pixels placed along the boundary of the block; a filtering device for selectively filtering the target pixel value in response to the selection signal to thereby produce a filtered target pixel value; a updating circuit for updating the target pixel value with the filtered target pixel value; and a circuit for retrieving the updated pixel value when all of the pixels contained in the decoded image data have been updated.
REFERENCES:
patent: 5280350 (1994-01-01), DeHaan et al.
Scene Adaptive Coder; IEEE Transactions on Communications, vol. Com. 32 No. 3, Mar. 1984; William K. Pratt, Senior Member IEEE.
A Motion-Compensated Interframe Coding Scheme For Television Pictures; IEEE Transactions on Comm. Vol.Com-30, #1, Jan./1982; Y. Ninomiya & Y. Ohtsuka.
Fixed & Adaptive Predictors For Hybrid Predictive/Transfor Coding; IEEE Transactions on Communications vol. Com-33, No. 12, Dec./1985; S. Ericsson .
Daewoo Electronics Co. Ltd.
Hsia Sherrie
Metjahic Safet
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