High efficiency technique for coding a digital video signal
First Claim
1. A highly efficient coding apparatus for coding digital video data in the form of blocks of digital video data representing plural picture elements so as to provide compressed video data, comprising:
- first and second detecting means for detecting maximum and minimum values, respectively, of the digital video data representing the plural picture elements in each of said blocks,means for generating dynamic range information for each said block from said maximum and minimum values for the respective block,means for generating modified digital video data for each said block as the difference between each of the digital video data and one of said maximum and minimum values for said respective block,means for encoding said modified digital video data with a fixed digitized bit number less than the number of bits in said original digital video data so as to provide coded data of a reduced fixed bit length, andtransmitting means for transmitting the coded data of reduced fixed bit length and an additional code for each said respective block formed of at least two of said maximum and minimum values and a signal corresponding to said dynamic range information.
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Abstract
In an apparatus for coding digital video data in the form of blocks thereof dynamic range information is generated from maximum and minimum values of the digital video data representing plural picture elements in each block, the minimum value is substracted from each of the digital data to generate modified digital video data, the modified digital video data is encoded with a fixed digitized bit number less than that of the original digital video data, and the encoded data and an additional code for each block are transmitted, with such additional code being formed of at least two of the maximum and minimum values for the respective block and a signal corresponding to the dynamic range information for each block.
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Citations
8 Claims
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1. A highly efficient coding apparatus for coding digital video data in the form of blocks of digital video data representing plural picture elements so as to provide compressed video data, comprising:
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first and second detecting means for detecting maximum and minimum values, respectively, of the digital video data representing the plural picture elements in each of said blocks, means for generating dynamic range information for each said block from said maximum and minimum values for the respective block, means for generating modified digital video data for each said block as the difference between each of the digital video data and one of said maximum and minimum values for said respective block, means for encoding said modified digital video data with a fixed digitized bit number less than the number of bits in said original digital video data so as to provide coded data of a reduced fixed bit length, and transmitting means for transmitting the coded data of reduced fixed bit length and an additional code for each said respective block formed of at least two of said maximum and minimum values and a signal corresponding to said dynamic range information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification