Television – Bandwidth reduction system – Data rate reduction
Patent
1997-05-28
1998-07-28
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348408, 348384, 348420, 382239, H04N 732, H04N 730
Patent
active
057868573
ABSTRACT:
An image-processing system in which harmful noises of image compression are effectively removed. The image processing system includes a transformation device for receiving m pixels.times.n lines of image information from an input and converting the image information via discrete cosine transformation to data represented in the frequency domain. A quantizer unit forms quantized data based on the frequency domain data received from the transformation device. A reverse quantization unit provides reverse quantized frequency domain data from the quantized data received from the quantizer unit. A second transformation device is connected to the reverse quantization unit for transforming the reverse quantized frequency domain data via inverse discrete cosine transformation to image information. A filtering unit is connected to the second transformation device for filtering the image information from the second transformation device based on the non-zero coefficient parameter. The image processing system is effective for reducing mosquito and block noises in compressed image information.
REFERENCES:
patent: 5311310 (1994-05-01), Jozawa et al.
patent: 5315326 (1994-05-01), Sugiyama
patent: 5321440 (1994-06-01), Yanagihara et al.
patent: 5359676 (1994-10-01), Fan
patent: 5379122 (1995-01-01), Eschbach
patent: 5479211 (1995-12-01), Fukuda
Chin Tommy P.
Donaldson Richard L.
Kempler William B.
Le Vu
Texas Instruments Incorporated
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