DATA ENCODING SYSTEM

摘要

Pixel data are encoded as grouping element data devoid of end of line indications. Input data analysing means is arranged to generate digits which are representative both of data distributions and data occurrences and processing means identify groupings of digits of mutually similar value. In one embodiment the image is analysed for determining the occurrences of value 0, value 1, ..., value 15 of the pixels and these values are ranked according to their occurrence figures. Values which occur most frequently are coded with relatively many "0" bits and values which occur less frequently are coded with relatively many "1" bits. The bit planes are then entropy encoded. Also each bit plane can be encoded by encoding the positions and sizes of squares of elements of bit value "1".