Hewlett-Packard Development Company, L.p.

Purdue Research Foundation

Albert Parra

Jan Philip Allebach

Mark Edward Shaw

A method is disclosed. In the method, color differences are calculated between a current video frame and a motion predicted version of the current video frame based on a human visual system's ability to perceive the color differences. Also, information in a difference frame is discarded based on the color differences. The difference frame includes differences between the current video frame and the motion predicted version of the current video frame.

Techniques for video compression

Disclosed are techniques for video stream compression. A motion predicted frame and a current frame of video data are converted from a source color space to a perceptual color space. A delta (&#x394;) frame is calculated between the current frame and the motion predicted frame. Input color difference values between the current frame and the motion predicted frame are determined and mapped to a normalized output to create a tone mapped color difference image. The tone mapped color difference image and &#x394; frame are multiplied to obtain a weighted &#x394; frame. &#x394; loss is calculated as the difference between the weighted &#x394; frame and the &#x394; frame. A variance map of the motion predicted frame is multiplied by the &#x394; loss to obtain a &#x394; preservation map. The weighted &#x394; frame and &#x394; preservation map are summed to obtain a modified &#x394; frame which may be transformed, quantized and encoded.

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West Lafayette, IN, United States of America

Albert Parra