The present invention relates to a loss encoding method for a binary image which to increase the coding efficiency lost encoded by selectively applying a loss encoding method using a conventional CR Loss encoding the binary image and the loss encoding method using the CAE probability table, the present invention is a loss encoding using the CR a binary image to be encoded in the size relationship of the amount of bits that are encoded in a manner that lost encoded using the method of loss encoding by using a CR with CAE probability table, and generating the coded it is possible to reduce the amount of bits to be transmitted by the coding efficiency nopyige loss encoding method or the CAE macroblock or VOP to choose a method for lossy coded using the probability table encoded.
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