Mosquito noise reduction filter in digital decoders
AssigneeLSI Corporation
InventorsHo-Ming Leung, Suryanaryana M. Potharaju
Life of this patent
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Abstract
A method for processing a compressed signal of digital video is disclosed. The method generally includes the steps of (A) generating a decompressed signal by decompressing the compressed signal of digital video, (B) generating a filtered signal by spatial filtering the decompressed signal, wherein the spatial filtering is arranged to reduce mosquito noise within the decompressed signal and (C) generating a video signal by adding synchronization information to the filtered signal, the synchronization information being suitable for synchronizing a video display to the filtered signal.
Claims18
A method for processing a compressed signal of digital video, comprising the steps of:
- (A) generating a decompressed signal by decompressing said compressed signal of digital video;
- (B) generating a first signal by spatial filtering said decompressed signal;
- (C) generating a second signal by comparing an amplitude of said first signal with a first threshold;
- (D) generating a third signal by modifying said first signal in response to said second signal;
- and
- (E) generating a video signal by subtracting said third signal from said decompressed signal to reduce mosquito noise, wherein (i) said third signal is attenuated in response to a programmable constant where said amplitude of said first signal is between said first threshold and a second threshold and (ii) said programmable constant has at most a unity value.
A system comprising:
- a memory circuit configured to buffer a compressed signal of digital video;
- and
- a processor circuit configured to (i) generate a decompressed signal by decompressing said compressed signal of digital video, (ii) generate a first signal by spatial filtering said decompressed signal, and (iii) generate a second signal by comparing an amplitude of said first signal with a first threshold, (iv) generate a third signal by modifying said first signal in response to said second signal and (v) generate a video signal by subtracting said third signal from said decompressed signal to reduce mosquito noise, wherein (a) said third signal is attenuated in response to a programmable constant where said amplitude of said first signal is between said first threshold and a second threshold and (b) said programmable constant has at most a unity value.
A system comprising:
- means for buffering a compressed signal of digital video;
- and
- means for (i) generating a decompressed signal by decompressing said compressed signal of digital video, (ii) generating a first signal by spatial filtering said decompressed signal, (iii) generating a second signal by comparing an amplitude of said first signal with a first threshold, (iv) generating a third signal by modifying said first signal in response to said second signal and (v) generating a video signal by subtracting said third signal from said decompressed signal to reduce mosquito noise, wherein (a) said third signal is attenuated in response to a programmable constant where said amplitude of said first signal is between said first threshold and a second threshold and (b) said programmable constant has at most a unity value.
Dependencies are inferred from the claim text.