it means to walk a block on sidewalks.
what does it mean to walk a block?
sidewalks
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a pixel image is divided into blocks of typically 4×4 pixels. for each block the mean and standard deviation of the pixel values are calculated; these statistics generally change from block to block. the pixel values selected for each reconstructed, or new, block are chosen so that each block of the btc compressed image will have (approximately) the same mean and standard deviation as the corresponding block of the original image. a two level quantization on the block is where we gain the compression and is performed as follows:





















































formula_1
block truncation coding