When transformed and quantized blocks of picture data are encoded, a block being constituted by a matrix of coefficients, the events within each block to be encoded comprise firstly a run indicating the number of zero-coefficients in the block between a current non-zero coefficient and the previous non-zero coefficient, and secondly, the size of the current non-zero coefficient of the block. Each event is in accordance with the invention completed by adding a third parameter which indicates whether the current non-zero coefficent is the last non-zero coefficent of the block. Hence, each event is represented as a three-dimensional quantity.
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