RGB value calculation device

Patent metadata

Field	Value
Publication number	US-10222263-B2
Application number	US-201715425488-A
Country	US
Kind code	B2
Filing date	Feb 6, 2017
Priority date	Sep 10, 2014
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A microcomputer equally divides the circumference of a RGB circle into 6×n (n is an integer of 1 or more) parts, and calculates a RGB value of each divided color. (255, 0, 0) is stored as a reference RGB value of a reference color in a ROM in the microcomputer. The microcomputer 3 converts the reference RGB value depending on an angular difference on the RGB circle between a designated color whose RGB value is to be found and the reference color, and assumes the converted RGB value as a RGB value of the designated color.

First claim

The invention claimed is:

1. A RGB value calculation device for equally dividing a circumference of a RGB circle into 6×n (n is an integer of 1 or more) parts and calculating a RGB value of each divided color, the RGB color circle being a schematic graphical representation of a plurality of colors arranged around a circumference of on a circle, the device comprising:
a controller including a processor, and a memory storage device, wherein
the memory storage device is configured to store an RGB value of at least one reference color as a reference RGB value, and
the processor is configured to,
convert the reference RGB value into a converted RGB value depending on an angular difference on the RGB circle between a designated color whose RGB value is to be determined and the at least one reference color, and
set the converted RGB value as a RGB value of the designated color such that the processor determines the RGB value of the designated color without retrieving the RGB value of the designated color from a plurality of predetermined RGB values.

2. The RGB value calculation device according to claim 1 ,
wherein a RGB value in which any one of R-value, G-value, and B-value is a maximum value and the remaining two have the same value is stored as the reference RGB value of the reference color, and each of the colors is attached with a color number of an integer increasing or decreasing in one way of the circumference of the RGB circle assuming a color on a line connecting the reference color and a center of the RGB circle as a (a is any integer), and
the processor is configured to,
calculate a RGB value of a first range color number p in a first range which is within 60° in one way of the circumference from the color number a by adding V max /n×|p−a| (V max is the maximum number of representations of the R-value, the G-value, and the B-value, and p is any of the color numbers in the first range) to one predetermined value of the R-value, the G-value, and the B-value of the reference RGB value, and
when a color number m of the designated color is in the first range, set the first range color number RGB value calculated by the processor as a RGB value of the designated color.

3. The RGB value calculation device according to claim 2 ,
wherein a radius of the RGB circle is divided by the number of saturation grades r (r is an integer), and an integer increasing or decreasing toward the center of the RGB circle is attached as a saturation parameter q assuming an outermost circumference of the RGB circle as b (b is an integer),
the memory storage device is configured to store the saturation parameter q and the number of saturation grades r, and
the processor is configured to calculate a RGB value of a color number in the first range by adding (n−p)/n×V max /r×|q−b| to one predetermined value of the R-value, the G-value, and the B-value of the reference RGB value and adding V max /r×|q−b| to one of the others.

4. The RGB value calculation device according to claim 3 ,
wherein when a color number m of the designated color is in a second range to which the first range is inverted by 180°, the processor is configured to,
calculate a RGB value of a second range color number (k+a) (k is the remainder of |m−a|/n) by V max /n×k,
inverts the second range color number RGB value, and
set the RGB value of the second range color number that has been inverted to be a RGB value of the designated color.

5. The RGB value calculation device according to claim 3 ,
wherein when a color number m of the designated color is in a third or fourth range to which the first range is shifted by 120° in both ways of the circumference, the processor is configured to,
calculate a RGB value of a third range color number (k+a) (k is the remainder of |m−a|/n) by V max /n×k,
replace each R-value, G-value, and B-value of the third range color number RGB value with a different one of the R-value, G-value, and B-value, and
set the RGB value of the third range color number that has been replaced to be a RGB value of the designated color.

6. The RGB value calculation device according to claim 3 ,
wherein when a color number m of the designated color is in a fifth or sixth range to which the first range is shifted by 60° in both ways of the circumference, processor is configured to,
calculate a RGB value of a fifth range color number (k+a) (k is the remainder of |m−a|/n) by V max /n×k,
invert the fifth range color number RGB value,
replace each R-value, G-value, and B-value of the fifth range color number RGB value with a different one of the R-value, G-value, and B-value, and
set the RGB value of the fifth range color number that has been inverted and replaced to be a RGB value of the designated color.

7. The RGB value calculation device according to claim 2 ,
wherein when a color number m of the designated color is in a second range to which the first range is inverted by 180°, the processor is configured to,
calculate a RGB value of a second range color number (k+a) (k is the remainder of |m−a|/n) by V max /n×k,
invert the second range color number RGB value, and
set the RGB value of the second range color number that has been inverted to be a RGB value of the designated color.

8. The RGB value calculation device according to claim 7 ,
wherein when a color number m of the designated color is in a third or fourth range to which the first range is shifted by 120° in both ways of the circumference, the processor is configured to,
calculate a RGB value of a third range color number (k+a) (k is the remainder of |m−a|/n) by V max /n×k,
replaces each R-value, G-value, and B-value of the third range color number RGB value with a different one of the R-value, G-value, and B-value, and
set the RGB value of the third range color number that has been replaced to be a RGB value of the designated color.

9. The RGB value calculation device according to claim 7 ,
wherein when a color number m of the designated color is in a fifth or sixth range to which the first range is shifted by 60° in both ways of the circumference, processor is configured to,
calculate a RGB value of a fifth range color number (k+a) (k is the remainder of |m−a|/n) by V max /n×k,
invert the fifth range color number RGB value,
replace each R-value, G-value, and B-value of the fifth range color number RGB value with a different one of the R-value, G-value, and B-value, and
set the RGB value of the fifth range color number that has been inverted and replaced to be a RGB value of the designated color.

10. The RGB value calculation device according to claim 2 ,
wherein when a color number m of the designated color is in a third or fourth range to which the first range is shifted by 120° in both ways of the circumference, the processor is configured to,
calculate a RGB value of a third range color number (k+a) (k is the remainder of |m−a|/n) by V max /n×k,
replace each R-value, G-value, and B-value of the third range color number RGB value with a different one of the R-value, G-value, and B-value, and
set the RGB value of the third range color number that has been replaced to be a RGB value of the designated color.

11. The RGB value calculation device according to claim 10 ,
wherein when a color number m of the designated color is in a fifth or sixth range to which the first range is shifted by 60° in both ways of the circumference, processor is configured to,
calculate a RGB value of a fifth range color number (k+a) (k is the remainder of |m−a|/n) by V max /n×k,
invert the fifth range color number RGB value,
replace each R-value, G-value, and B-value of the fifth range color number RGB value with a different one of the

Assignees

• Yazaki Corp

Inventors

• Shigezane Yasuyuki

Classifications

• G01J3/462

  Computing operations in or between colour spaces; Colour management systems · CPC title

• G01J3/522

  circular colour charts · CPC title

• H05B45/20

  Controlling the colour of the light · CPC title

• G01J3/46 Primary

  Measurement of colour; Colour measuring devices, e.g. colorimeters (measuring colour temperature G01J5/60) · CPC title

• H05B37/0227

  Electricity · mapped topic