C-cube Microsystems, Inc.

Divicom Inc.

Thomas R Ayers

Christopher Mills

Michael P Lenihan

A method and apparatus for single-buffered display capture which eliminates a 'tearing' problem inherent in certain conventional video display techniques. A video signal including a sequence of frames each having an even field and an odd field is applied to a video capture circuit. First and second sets of lines each representing a different subset of all the lines in a given even or odd field are captured in the video capture circuit and displayed by a video display circuit. The video capture circuit captures the first set of lines in an even field of the video signal during a time period in which the video display circuit displays the second set of lines in the even field. The video capture circuit also captures the second set of lines in an odd field of the video signal during a time period in which the video display circuit displays the first set of lines in the odd field. The video capture circuit utilizes an odd-numbered decimation factor to determine the first and second sets of lines from among all lines in the even and odd fields.

Processing system with single-buffered display capture

A method and apparatus for differential video data encoding which utilizes a reduced number of bits per pixel to encode chroma and luma components of a video data stream. A 4-bit absolute code is determined for a given 8-bit luma or chroma component in the data stream. The determined absolute code is indicative of a particular one of a plurality of ranges into which the given component falls. The given component is encoded using the determined absolute code if the absolute code produces a lower encoding error than a 4-bit delta code which encodes the component as a difference relative to a previously-encoded component. If the delta code produces a lower encoding error than the determined absolute code, the given component is encoded using the delta code. In a situation in which the given component is the first component of its type on a line of video, an absolute code may be used regardless of whether or not the absolute code produces a higher encoding error than the delta code.

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San Jose, CA, United States of America

Thomas R Ayers