High efficiency coding apparatus
First Claim
1. A highly efficient coding apparatus for coding digital video in a block format allowing video data compression for transmission by data transmission means having a predetermined transmission capacity, comprising:
- first detecting means for detecting a maximum value of the digital video data of plural picture elements in a block;
second detecting means for detecting a minimum value of said digital video data of plural picture elements in said block;
means for subtracting said minimum value from the digital video data for each of said picture elements to generate modified digital video data;
means for generating a distribution table of said dynamic range informatin during a predetermined period;
means for determining an encoding bit number for each block during said predetermined period from said distribution table and said predetermined transmission capacity of said data transmission means;
encoding means for encoding said modified digital video data with said encoding bit number andmeans for transmitting an output of said encoding means, a first additional code for each block formed of at least two of said maximum value, minimum value and a signal based on said dynamic range information, and a second additional code for each said predetermined period.
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Abstract
In an apparatus for coding digital video data in a block format, the dynamic range information is generated from maximum and minimum values of plural picture elements in a block, and the minimum value is subtracted from each of the digital data to generate modified digital video data. A distribution table of the dynamic range information during a predetermined period, such as plural fields, is generated, and the encoding bit number for each block is determined based on the distribution table and the capacity of the transmission line such as a VTR. The modified data is encoded with such encoding bit number and transmitted with a first additional code per block formed of the minimum value and a signal based on the dynamic range information and with a second additional code for the predetermined period.
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Citations
6 Claims
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1. A highly efficient coding apparatus for coding digital video in a block format allowing video data compression for transmission by data transmission means having a predetermined transmission capacity, comprising:
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first detecting means for detecting a maximum value of the digital video data of plural picture elements in a block; second detecting means for detecting a minimum value of said digital video data of plural picture elements in said block; means for subtracting said minimum value from the digital video data for each of said picture elements to generate modified digital video data; means for generating a distribution table of said dynamic range informatin during a predetermined period; means for determining an encoding bit number for each block during said predetermined period from said distribution table and said predetermined transmission capacity of said data transmission means; encoding means for encoding said modified digital video data with said encoding bit number and means for transmitting an output of said encoding means, a first additional code for each block formed of at least two of said maximum value, minimum value and a signal based on said dynamic range information, and a second additional code for each said predetermined period. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification