| 摘要 |
The invention concerns a method of compressing and transmitting digital data, in particular images, at a constant bit rate, the method comprising the following steps: splitting input data into blocks of data, applying an orthogonal or bi-orthogonal transform (12) to each block, quantizing (14) the coefficients obtained by applying the transform, entropically coding (20) the quantized coefficients, temporarily saving the data resulting from coding in a buffer memory (18), removing a particular number of bits from the memory for each block of digital data, and adjusting the quantizing step by applying a control function (50) to obtain, after coding, a number of bits close to the number of bits removed from the memory for each block of data. The control function (50) takes account of the data bit rate measured for at least the preceding block.
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