| 摘要 |
The method for coding a digital image comprising macroblocks in binary flow includes a step of estimating (EST) the reconstruction capacity for macroblocks by an error-concealment procedure, a step of deciding (DEC) the exclusion of coding a macroblock as a function of the capacity for reconstructing the macroblock, and a step of introducing a resynchronization marker (MARK) into the binary flow following the exclusion of one or more macroblocks. The decision step includes a sub-step of evaluating (EVAL) the decrease of binary flow caused by the exclusion of macroblocks, and the decision is based on a criterion of the decrease. The method includes a step of computing (CAL) the rate of output binary flow for making the exclusion decision. The macroblocks which are not excluded are inserted into the video data packet at an acceptance step (BC). A coder for coding a digital image comprising macroblocks in binary flow comprises an estimation module, a decision module, a decision module, and a module for introducing the resynchronization marker. A binary flow comprising the coded data of a digital image in macroblocks is such that the macroblocks are not coded in at least one point of binary flow, and the noncoded macroblocks have the capacity for reconstruction by the error-concealment procedure. A method for decoding a binary flow comprising the coded data of a digital image comprising macroblocks includes a step of detecting the noncoded macroblocks and a step for activating the error-concealment procedure, where the detection step includes a sub-step of detecting nonregular intervals between the resynchronization markers. A decoder for decoding a binary flow comprising the coded data comprises a detection module and an error-concealment module. A computer program for a coder comprises a set of functions and a collective resource for the functions access, that is a set of instructions which are loaded into the coder for executing the coding method. A computer program for a decoder comprises a set of functions and a collective resource for the functions access, that is a set of instructions which are loaded into the decoder for executing the decoding method.
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