Method and apparatus for reduction of image data compression noise
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United States of America Patent
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May 13, 1997
Grant Date -
N/A
app pub date -
May 15, 1995
filing date -
May 15, 1995
priority date (Note) -
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Abstract
An image encoding/decoding apparatus for performing transform coding by a method in which blocking artifacts are suppressed or eliminated is disclosed in which encoded data, transmitted by the encoding apparatus, is converted into received image data terms which are subsequently overlap transformed into frequency coefficients for modification by means of a filtering operation utilizing a quantization error matrix. The quantization error matrix can be derived from quantization error data generated in the encoding unit, or can be provided as a look-up table in the decoding unit. The modified frequency coefficients are converted into reduced-noise image data terms for reconstruction into a digital image.
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