Environment-compliant image display system and program

• US 20020015043A1
• Filed: 07/30/2001
• Published: 02/07/2002
• Est. Priority Date: 07/31/2000
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Matsuda, Hideki
• Granted Patent: US 6,847,374 B2
• Time in Patent Office: Days
• US Class Current: 345/596
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 5/00 Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators image data processing or generation, in general G06T
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables
• CPC Class Codes: H04N 1/407 Control or modification of tonal gradation or of extreme levels, e.g. background level
• CPC Class Codes: H04N 1/4074 using histograms
• CPC Class Codes: H04N 5/202 Gamma control circuits for controlling camera response irrespective of the scene brightness H04N23/82
• CPC Class Codes: H04N 5/58 in dependence upon ambient light
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 9/73 Colour balance circuits, e.g. white balance circuits or colour temperature control camera processing pipelines for colour balance H04N23/88

Abstract

To provide an environment-compliant image display system and program, there is provided a color control processing update section which corrects colors by adjusting a LUT in a 3D-LUT storage section and corrects brightness by adjusting γ values in a 1D-LUT storage section, to increase an output value in at least a lower grayscale range when the environment is affected by ambient light, based on environmental information that has been obtained by a colored-light sensor.

Claims

1. An environment-compliant image display system which corrects an image, based on environmental information that expresses visual environment in an area in which the image is displayed, and displays the image;

the image display system comprising;

correction means which corrects input-output characteristic data for display that is used by a means for displaying the image, the correction being in such a manner as to increase an output value in at least a lower grayscale range when the environment is affected by ambient light, based on the environmental information.

2. The image display system as defined in claim 1,

wherein the correction means corrects the input-output characteristic data by performing a predetermined calculation using parameters that differ between a lower grayscale range and a grayscale range other than the lower grayscale range.

3. The image display system as defined in claim 2,

wherein the correction means corrects the input-output characteristic data by performing a predetermined calculation based on a difference between a brightness value for actual environment which is comprised within the environmental information, and a brightness value for an ideal environment.

4. The image display system as defined in claim 3,

wherein the correction means performs gamma correction as at least part of the correction of the input-output characteristic data.

5. The image display system as defined in claim 4,

wherein the correction means corrects color modification information that is stored in a predetermined storing region, in such a manner that a color temperature of the image to be displayed is adjusted, based on a brightness value for the actual environment that is comprised within the environmental information.

6. The image display system as defined in claim 5,

wherein the color modification information is a three-dimensional look-up table.

7. An environment-compliant image display system which corrects an image, based on environmental information that expresses visual environment in an area in which the image is displayed, and displays the image;

the image display system comprising;

a correction section which corrects input-output characteristic data for display that is used by a means for displaying the image, the correction being in such a manner as to increase an output value in at least a lower grayscale range when the environment is affected by ambient light, based on the environmental information.

8. A program embodied on an information storage medium or in a carrier wave, the program for correcting an image, based on environmental information that expresses visual environment in an area in which the image is displayed, and displaying the image;

the program implementing in a computer;

correction means for correcting input-output characteristic data for display that is used by a means for displaying the image, the correction being in such a manner as to increase an output value in at least a lower grayscale range when the environment is affected by ambient light, based on the environmental information.

9. The program as defined in claim 8,

wherein the correction means corrects the input-output characteristic data by performing a predetermined calculation using parameters that differ between a lower grayscale range and a grayscale range other than the lower grayscale range.

10. The program as defined in claim 9,

wherein the correction means corrects the input-output characteristic data by performing a predetermined calculation based on a difference between a brightness value for actual environment which is comprised within the environmental information, and a brightness value for an ideal environment.

11. The program as defined in claim 10,

wherein the correction means performs gamma correction as at least part of the correction of the input-output characteristic data.

12. The program as defined in claim 11,

wherein the correction means corrects color modification information that is stored in a predetermined storing region, in such a manner that a color temperature of the image to be displayed is adjusted, based on a brightness value for the actual environment that is comprised within the environmental information.

13. The program as defined in claim 12,

wherein the color modification information is a three-dimensional look-up table.