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

1996-04-29

1998-03-31

Rogers, Scott A.

Image analysis

Image enhancement or restoration

Image filter

382268, 348607, 348625, 358463, G06T 500, G06K 940, G06K 944, H04N 1409, H04N 521

Patent

active

057347573

ABSTRACT:
A post-processing filtering apparatus for use in an image signal decoding system, capable of improving the image quality of the system, comprises: memory means for storing the decoded image data of the current frame; a buffer for storing a target pixel data; means for filtering target pixel data to provide filtered target pixel data; means for adding a predetermined threshold to the target pixel data, thereby providing an upper value; first comparison means for comparing the filtered target pixel data with the upper value to provide a first selection signal; first selection means for selecting, in response to the first selection signal, the target pixel data stored at the buffer or the filtered target pixel data; means for subtracting the predetermined threshold from the target pixel data, thereby providing a lower value; second comparison means for comparing either the filtered target pixel data or the target pixel data selected at the first selection means, with the lower value to provide a second selection signal; second selection means for selecting, in response to the second selection signal, the target pixel data, or either the filtered target pixel data or the target pixel data selected at the first selection means, to thereby provide a filtered result; and means for updating the target pixel data stored at the memory means with the filtered result.

REFERENCES:
patent: 4953114 (1990-08-01), Sato
patent: 5384849 (1995-01-01), Jeong
patent: 5454051 (1995-09-01), Smith
patent: 5555029 (1996-09-01), Kim

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