Method and device for the reduction of noise generated by a digital image encoder/decoder operating by blocks
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United States of America Patent
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Feb 20, 1990
Grant Date -
N/A
app pub date -
Aug 25, 1988
filing date -
Oct 31, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a method for the reduction of the noise generated during the encoding/decoding of digitized images operating by blocks. To reduce the faults visible in the restored image, the method consists in filtering the image by using a filtering window, for example with dimensions of 3.times.3 pixels, which scans the image, the current point being the central point of this window, and in determining, for each point, the mean of the values associated wih the points of this window, and in determining for the current point, from this mean and from a characteristic value of the operating status of the encoder, a filtering parameter which can be used to determine the filtered value associated with the current point. The invention can be applied to the resutitution of block encoded images especially in digitalized video tape-recorders.
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