Conditional quantization grey level and color image coding appar

Details Conditional quantization grey level and color image coding appar Conditional quantization grey level and color image coding appar

1984-06-01

1986-09-23

Lall, Parshotam S.

Boots, shoes, and leggings

358260, 358261, 382 52, H04N 712, H04N 140

Patent

active

046139486

ABSTRACT:
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 that 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 that a prequantizer quantizes and linearizes into one-dimension that are then conditionally quantized using one-dimensional grey-level techniques.

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U.S. patent application Ser. No. 505,885, filed Jun. 20, 1983 by H. Gharavi.
IEE Proc., vol. 127, Pt. F, No. 5, Oct. 1980, pp. 405-409.

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