Post-processing method and apparatus for use in an image signal

Details Post-processing method and apparatus for use in an image signal Post-processing method and apparatus for use in an image signal

1995-06-29

1996-09-10

Metjahic, Safet

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348625, 382262, 382272, H04N 521

Patent

active

055550282

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 filter for filtering target pixel data in the stored decoded image data to thereby produce filtered target pixel data, wherein the target pixel data represents the value of a pixel to be filtered; a calculator for calculating an absolute difference value between an original target pixel data and the filtered target pixel data; a first circuit for selectively generating a first or a second threshold value based on the decoded image data and the target pixel data; a second circuit for updating the stored target pixel data with the filtered target pixel data if the absolute difference value is smaller than the generated threshold value; and a third circuit for sequentially updating the stored target pixel value with corrected target pixel data T times if the absolute difference value is equal to or larger than the generated threshold value.

REFERENCES:
patent: 5280350 (1994-01-01), DeHaan
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/Transform Coding; IEEE Transactions on Communications vol. Com-33, No. 12, Dec. 1985; S. Ericsson .

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