Look-up table forming method and device

Details Look-up table forming method and device Look-up table forming method and device

1995-11-22

1998-05-05

Coles, Jr., Edward L.

Image analysis

Histogram processing

382162, G06K 900

Patent

active

057487715

ABSTRACT:
In look-up table forming method and device, superordinate bits (4 bits) of brightness data and superordinate bits (2 bits) of each of a pair of color difference data are extracted from original image data comprising brightness data (8 bits) and a pair of color difference data (respective 8 bits) of each picture element to form entry addresses (each 8 bits) (classify the colors of an original image into 256 color blocks), a color histogram representing a frequency distribution of a color (16 bits) is formed on the basis of subordinate bits (4 bits) of the brightness data and subordinate bits (respective 6 bits) of each of the pair of the color difference data, and a color having the maximum frequency is selected as a representative color every entry address on the basis of the color histogram, thereby forming a look-up table.

REFERENCES:
patent: 4941037 (1990-07-01), Sasaki et al.
patent: 5347374 (1994-09-01), Fuss et al.
patent: 5377025 (1994-12-01), Spaulding et al.
patent: 5608851 (1997-03-01), Kobayashi

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