US Patent No. 9,916,811

COLOR CONVERSION DATA GENERATION DEVICE, COLOR CONVERSION DATA GENERATION METHOD, AND DISPLAY DEVICE


Patent No. 9,916,811
Issue Date March 13, 2018
Title Color Conversion Data Generation Device, Color Conversion Data Generation Method, And Display Device
Inventorship Katsuyuki Matsui, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 9,916,811

1. A color conversion data generation device for generating correction values to be set on a three-dimensional lookup table
(3D LUT) circuit having interpolation characteristics, the color conversion data generation device comprising:
an acquisition unit that acquires end point correction values for correcting a color of at least one end point of a red, green,
and blue (RGB) color space, the at least one end point being a point where each tone value of red, green, and blue in the
RGB color space is a minimum value or a maximum value;

an end point color correction value generation unit that corrects the color of the at least one end point using the acquired
end point correction values, to generate end point color correction values;

a normalization unit that normalizes an intermediate color in the RGB color space using a normalization coefficient, the normalization
coefficient being defined according to the intermediate color;

an interpolation unit that interpolates the normalized intermediate color using the generated end point color correction values
by interpolation characteristic same as the interpolation characteristics of the 3D LUT circuit, to generate temporary correction
values; and

an inverse normalization unit that inverse-normalizes the generated temporary correction values using an inverse normalization
coefficient, to generate correction values of the intermediate color, the inverse normalization coefficient being defined
according to the normalization coefficient.