1. A method of video coding that transforms a first block of residual pixel values of moving pictures by an integer-transform function generating a corresponding second block of integer-transform coefficients followed by quantifying the integer-transform coefficients using quantization intervals defined by a number of decision values, said method comprising: transforming the first block by a binary-transform function generating a corresponding third block of binary-transform coefficients; and defining the second block to include only zeros if one or more binary-transform coefficients of lowest coordinates in the third block are less than a predefined threshold.