| 摘要 |
A highly efficient coding apparatus for coding digital video data comprises: means for receiving the digital video data represented by respective picture element data of first predetermined bits, means for determining at least one elementary picture element for each block, means for predicting values of respective ones of subject picture element data, means for detecting respective predictive errors of the predicted values from the real values of the picture element data, means for determining if each predictive error is greater than a threshold value, means for generating flag data by the output of the determining means, means for gating the elementary picture element data and the subject picture element data for which the respective predictive errors are greater than the threshold value first and second detecting means for detecting maximum and minimum values, respectively of the output of the gating means in each of the blocks, means for generating dynamic range information for each block from the maximum and minimum values for the respective block, means for generating modified digital video data for each block as the difference between each of the output data of the gating means and one of the maximum and minimum values for the respective block, means for encoding the modified digital video data with a variable digitized bit number determined by the flag data for the respective block so as to provide coded data of variable bit length, thereby the data amount of the coded data for each block can be maintained substantially constant, and transmitting means for transmitting at least the coded data and the flag data. |
