Bandwidth reduced multi-pass writing of variable gray level digital images.

摘要

User-viewable renderings of variable gray level images composed of pixels represented by binary coded codewords are written on a suitable recording medium by one or more pixel generators which have their write responses code matched to the codewords. More particularly, the write responses of the pixel generators (22a-----) are "code matched" to the codewords by cyclically and bit synchronously stepping them through a series of gray-scale values which are selected to substantially match the binary weights of the respective bits of the codewords. Such code matched pixel generators are selectively write enabled and disabled in response to the logic levels of the successive bits of the codewords that are applied to them, whereby the binary weighted writes any of them performs in response to a given codeword spatially sum to form a pixel having approximately the same gray-scale value as the given codeword.