H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/30 (2006.01) H04N 1/41 (2006.01) H04N 1/64 (2006.01) H04N 7/50 (2006.01)
Patent
CA 2423165
A system and method facilitating progressively transforming and coding digital pictures is provided. The present invention via employment of a multi- resolution lapped transform provides for progressive rendering as well as mitigation of blocking artifacts and ringing artifacts as compared to many conventional compression systems. The invention includes a color space mapper, a multi-resolution lapped transform, a quantizer, a scanner and an entropy encoder. The multi-resolution lapped transform outputs transform coefficients, for example, first transform coefficients and second transform coefficients. A multi-resolution representation can be obtained utilizing second transform coefficients of the multi-resolution lapped transform. The color space mapper maps an input image to a color space representation of the input image. The color space representation of the input image is then provided to the multi-resolution lapped transform. The quantizer receives the first transform coefficients and/or the second transform coefficients and provides an output of quantized coefficients for use by the scanner and/or the entropy encoder. The scanner scans the quantized coefficients in order to produce a one-dimensional vector for use by the entropy encoder. The entropy encoder encodes the quantized coefficients received from the quantizer and/or the scanner resulting in data compression.
Microsoft Corporation
Smart & Biggar
LandOfFree
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