# US 8,542,246 B2 · Color conversion device, color conversion table and color conversion method

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- Number: US 8,542,246 B2
- Document ID: US8542246B2
- Status: Granted
- Kind: B2
- Application number: 12/921,867
- Filed: 2009-03-11
- Published: 2011-01-20
- Granted: 2013-09-24
- Earliest claimed: 2008-03-11
- Assignees: Panasonic Corporation
- Applicants: Katsuo Saigo; Hiroshi Miyai; Hisakazu Hitomi; Masanobu Inoe; Masahiro Kawashima; Akihiro Takeuchi
- Inventors: Katsuo Saigo; Hiroshi Miyai; Hisakazu Hitomi; Masanobu Inoe; Masahiro Kawashima; Akihiro Takeuchi
- Web page: https://patentgrep.com/patent/US8542246B2

## CPC

- H04N 1/6058: {Reduction of colour to a range of reproducible colours, e.g. to ink- reproducible colour gamut}
- G06T 11/10: Texturing; Colouring; Generation of textures or colours (retouching, inpainting or scratch removal G06T5/77)
- H04N 1/62: Retouching, i.e. modification of isolated colours only or in isolated picture areas only
- H04N 1/628: {Memory colours, e.g. skin or sky}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

A color conversion device generates color data in a second color gamut based on first converted color data and input color data, which are obtained from input color data in a first color gamut, and outputs the color data in the second color gamut. The color conversion device includes a first color mapping unit which generates the first converted color data by mapping the input color data into the second color gamut; a color mixing unit which generates color data by mixing the first converted color data and second converted color data at a ratio corresponding to the first color gamut and the second color gamut; and a color data output unit which outputs the color data.

## Claims

### Claim 1

A color conversion device comprising:
an obtaining unit configured to obtain input color data represented by a first color gamut;
a color mapping unit configured to generate, from the input color data, converted color data that is represented by a second color gamut and for which a chromaticity point of the input color data is maintained, the second color gamut being broader than the first color gamut;
a color mixing unit configured to generate mixed color data by mixing, while changing a mixing ratio depending on a color, the generated converted color data and the obtained input color data on which color conversion is not performed; and
an output unit configured to output the mixed color data to an external device.

### Claim 2 (depends on 1)

The color conversion device according to claim 1,
wherein the color mixing unit is configured to (1) set a mixing ratio of the converted color data from among the input color data and the converted color data, to be higher for at least color data representing human skin color, and (2) set a mixing ratio of the input color data from among the input color data and the converted color data, to be higher for at least color data representing a color at a boundary and in a vicinity of a color gamut that the external device is capable of representing.

### Claim 3 (depends on 1)

The color conversion device according to claim 1,
wherein the color mixing unit is configured to set the mixing ratio based on a difference in size between the first color gamut and the second color gamut.

### Claim 4 (depends on 2)

The color conversion device according to claim 2,
wherein the color mixing unit is configured to set the mixing ratio to be higher as a difference in size between the first color gamut and the second color gamut is greater.

### Claim 5 (depends on 1)

The color conversion device according to claim 1,
wherein the color mixing unit is configured to set a mixing ratio of the input color data and a mixing ratio of the converted color data for each of hues set in the input color data and the converted color data.

### Claim 6 (depends on 1)

The color conversion device according to claim 1,
wherein the color mixing unit is configured to set a mixing ratio of the input color data to be higher for part of the input color data and the converted color data, the part having high saturation.