Encoding and decoding color image data based on mean luminance a

Details Encoding and decoding color image data based on mean luminance a Encoding and decoding color image data based on mean luminance a

1995-08-23

1997-04-08

Johns, Andrew

Image analysis

Color image processing

Compression of color images

382233, 382237, H04N 1102, G06K 900

Patent

active

056195915

ABSTRACT:
A method for encoding and decoding still video frames, and a sequence of frames of digitized motion picture video data, using inter-frame analysis. Sequences of frames are encoded by first subdividing each frame within a set of adjacent frames into a plurality of blocks, each corresponding to at least one other block within at least one adjacent frame, so as to create a group of corresponding of blocks. A luminance component of each pixel within each group of corresponding blocks is averaged to generate a mean luminance value for each group of corresponding blocks. An upper color value for each group of corresponding blocks is determined, as well as a lower color value. A one-bit value is assigned to each pixel within each block. The one-bit value is set to a first binary level when the luminance component of an associated pixel value is greater in magnitude than the corresponding mean luminance value. The one-bit value is set to a second binary level when the luminance component of an associated pixel value is not greater in magnitude than the corresponding mean luminance value. In this manner, sets of adjacent frames may be represented in encoded form by a one-bit per pixel matrix, with a single upper color value and a single lower color value for each group of blocks.

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