Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1990-01-02
1992-09-22
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
340793, 358 80, H04N 964
Patent
active
051501996
ABSTRACT:
A method for converting video RGB values developed in a digital video color analysis system into standard tristimulus or CIELAB values or the like comprises empirically determining separate RGB and XYZ color values for a plurality of colors; determining by regression analysis the value of X as a function of R, the value of Y as a function of G, and the value of Z as a function of B, using only gray scale colors where the RGB values are approximately the same; determining the X value by further regression analysis determined to find X as a function of the previously computed values of the multiple variable X, Y and Z, using color values including colors where the RGB values are not identical; determining an intermediate value of Y in the same manner as the foregoing value of X; performing an additional regression analysis to find a second intermediate value of Y as a function of the second intermediate value of Y; determining an error value representative of the difference between Y and the first intermediate value of Y and performing a regression analysis to determine the error value as a function of the value of the red chroma; and subtracting the red chroma function from the second intermediate value of Y to obtain the value of Y corresponding to the measured RGB values. The X, Y, and Z values thus determined are representative of video RGB values for the same colors with a high degree of accuracy.
REFERENCES:
patent: 4481529 (1984-11-01), Kerlin
patent: 4641971 (1987-02-01), Korth
patent: 4688031 (1987-08-01), Haggerty
Hughes Dana N.
Kuchta Steven L.
Shoemaker Martin L.
Burgess Glenton B.
Groody James J.
Megatronics, Inc.
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