H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33
H04N 7/12 (2006.01) G06T 9/00 (2006.01) H04N 1/40 (2006.01) H04N 1/41 (2006.01) H04N 7/26 (2006.01)
Patent
CA 1223336
Abstract of the Disclosure In the transmission of PCM coded picture elements (pels), the level value of each pel of an image is quantized in accordance with one-of-a-plurality of quantization schemes which is determined by the quantized level values of adjacent neighbor pels. Each of the quantization schemes is configured from the relative frequency of occurrence of each pel level value for a given combination of neighbor pel level values. Various embodiments may involve grey-level values of each pel of an image, the three-dimensional red, green and blue level values of an image quantized in accordance with a three- dimension quantization scheme determined by the three- dimensional quantized level values of adjacent neighbor pels, or three-dimensional color values which a pre- quantizer quantizes and linearizes into one-dimension which are then conditionally quantized using one- dimensional grey-level techniques.
474739
Bell Communications Research Inc.
Ridout & Maybee Llp
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