SCALABLE CODING

摘要

The invention proposes a method of and a device for coding a signal (S) to obtain a scalable bit-stream (O). The signal (S) comprises blocks of values. Each block is represented ( 20 ) as a sequence of bit planes and the values are scanned and transmitted ( 21, 23 ) in an order of decreasing bit plane significance. For each bit plane the scanning and transmitting ( 21,23 ) are performed in a rectangular scan zone (R_MAX/C_MAX) starting from a corner of the block (usually an upper-left corner). Preferably, the scanning and transmitting ( 21,23 ) is performed on each block individually. The produced bit-stream (O) is quantized to a desired bit-rate by simple truncating ( 3 ) the bit-stream (O) at a desired position.