Method and apparatus for visual lossless image syntactic encoding
View Patent ↗An encoder includes a receiver and an encoder. The receiver receives frames of a video signal and the encoder pre-processes the video signal such that a video compression encoder can compress the video signal at least two times more than the video compression encoder can without the preprocessing operation.
1. An encoder comprising:
a receiver which receives frames of a video signal; and
an encoder which pre-processes said video signal such that a video compression encoder can compress said video signal in a visually lossless way two to five times more than said video compression encoder can without said preprocessing.
2. An encoder according to claim 1 , and also comprising a thresholder which identifies a plurality of visual perception threshold levels to be associated with the pixels of said video signal, wherein said threshold levels define contrast levels above which a human eye can distinguish a pixel from among its neighboring pixels of said video signal.
3. An encoder according to claim 2 and additionally comprising: a filter which divides a video frame into portions having different detail dimensions; and an associator, utilizing said threshold levels and said detail dimensions, which associates said pixels of said video frame into subclasses, wherein each subclass includes pixels related to the same detail and which generally cannot be distinguished from each other.
4. An encoder according to claim 3 and also comprising an intensity alterer which alters the intensity of each pixel of said video frame according to its subclass.
5. An encoder comprising:
a receiver which receives frames of a video signal;
a thresholder which identifies a plurality of visual perception threshold levels to be associated with the pixels of said video signal, wherein said threshold levels define contrast levels above which a human eye can distinguish a pixel from among its neighboring pixels of said video signal; and
an encoder which pre-processes said video signal for compression at least by changing pixels in ways that said human eye cannot distinguish and which provides said pre-processed video signal to a video compression encoder for visual lossless compression of at least two times more than said video compression encoder can do without said preprocessing.