Method of reducing mosquito noise generated during decoding proc

Details Method of reducing mosquito noise generated during decoding proc Method of reducing mosquito noise generated during decoding proc

1995-11-21

1998-05-19

Coles, Sr., Edward L.

Image analysis

Image compression or coding

Including details of decompression

358432, 382232, H04N 5210, H04N 140

Patent

active

057546991

ABSTRACT:
A device for decoding coded image data to generate decoded image data by applying inverse orthogonal transformation to each block into which the coded image data is divided includes a quantization-information detecting unit detecting block-quantization-step-size information indicative of quantization step sizes used for a given block, and a frequency-characteristic modifying unit modifying high frequency components of the decoded image data for the given block based on the block-quantization-step-size information, the high frequency components having frequencies higher than a predetermined frequency.

REFERENCES:
patent: 5241387 (1993-08-01), Fujikawa et al.
patent: 5434677 (1995-07-01), Oikawa
patent: 5535013 (1996-07-01), Murata
Yasuyuki Nakajima, "Postprocessing Algorithms for Noise Reduction of MPEG Coded Video", Technical Report of IEICE, IE94-7, DSP94-7(1994-04), pp. 45-51, 1994.
Masahiko Achiha et al., "Image Quality Improving Circuit", Broadcasting Technology, 1992.2, pp. 141-147, 1992.

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