| 摘要 |
<p>A high efficiency coding apparatus for coding digital video data in a block format allowing video data compression, characterised by… first (32) and second (33) detecting means for detecting respective extreme values of the digital video data of plural picture elements in said block; the extreme value detected by the first detecting means being the maximum of said values, and that detected by the second detecting means being the minimum;… means for generating dynamic range information (4) of the block from said maximum and minimum values;… means (45) for forming the difference between one of said extreme values from each of the digital video data to generate modified digital video data;… means for generating a distribution table (5) of said dynamic range information during a predetermined period;… means for determining an encoding bit number for each block during said predetermined period from said distribution table and a capacity of data transmission means;… encoding means (7) for encoding said modified digital video data with the bit number determined by said determining means; and… transmitting means for transmitting an output of said encoding means, a first additional code per 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.</p> |
