Correction curve generating method, image processing method, image display unit, and storage medium

• US 20020094123A1
• Filed: 09/12/2001
• Published: 07/18/2002
• Est. Priority Date: 09/13/2000
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Nippon Kanzai Company Limited
• Inventors: Kanai, Masashi
• Granted Patent: US 6,990,234 B2
• Time in Patent Office: Days
• US Class Current: 382/167
• 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

It is intended to provide an image processing method, an image display unit, and a storage medium, capable of effecting an appropriate color reproduction even with a change in color of a projection plane.

In an image display unit according to the present invention which applies a desired image processing to inputted image data and then displays the image, a reflection characteristic for each color component of an output provided from the image display unit and reflected by a predetermined projection plane and a reflection characteristic for each color component of the output from the image display unit and reflected by a reference projection plane are measured by a measuring means. Further, by a correction curve generating means there is generated a correction curve for correcting the inputted image data so as to eliminate a difference between the measured rejection characteristic for each color component reflected by the predetermined projection plane and the reflection characteristic for each color component reflected by the reference projection plane. With the correction curve, an image processing is performed for the image data inputted to the image display unit, taking into account the characteristic of the projection plane on which an output from the image display unit is projected.

Claims

1. A method for generating a correction curve for correcting image data inputted to an image display unit, taking into account characteristics of a projection plane on which an output from said image display unit is projected said method comprising:

a measuring step of measuring a reflection characteristic for each color component of an output provided from said image display unit and reflected by a predetermined projection plane and a reflection characteristic for each color component of the output provided from said image display and reflected by a reference projection plane; and

a correction curve generating step of generating a correction curve for correcting the inputted image data so as to eliminate a difference between the measured reflection characteristic for each color component reflected by the predetermined projection plane and a reflection characteristic for each color component reflected by a reference projection plane.

2. An image processing method for image data inputted to an image display unit, taking into account characteristics of a projection plane with an output from said image display unit projected thereon, wherein said method corrects input image data by using a correction curve for eliminating a difference between a reflection characteristic for each color component of an output provided from said image display unit and reflected by a predetermined projection plane and a reflection characteristic for each color component of the output provided from said image display and reflected by a reference projection plane.

3. An image processing method according to claim 2, which uses a plurality of correction curves for a plurality of projection planes.

4. An image processing method according to claim 2, wherein the amount of correction of input image data corrected by said correction curve(s) is adjustable.

5. An image processing method according to claim 2, wherein said correction curve(s) is subjected to a rounding process in a high graduation region.

6. An image processing method according to claim 5, wherein the degree of said rounding process is adjustable.

7. An image processing method according to claim 3, including a selection step of selecting one correction curve from among said plural correction curves on the basis of a reflection characteristic for each color component reflected by a projection plane, and wherein an image processing is performed for input image data on the basis of the selected correction curve.

8. An image processing method according to claim 7, further including a step of inputting the reflection characteristic for each color component reflected by the projection plane in said selection step.

9. A image processing method according to claim 7, further including a step of measuring the reflection characteristic for each color component reflected by the projection plane in said selection step.

10. An image display unit for performing an image processing for an inputted image data, taking into account characteristics of a projection plane, wherein said image display unit corrects input image data by using a correction curve for eliminating a difference between a reflection characteristic for each color component of an output provided from said image display unit and reflected by a predetermined projection plane and a reflection characteristic for each color component of the output provided from said image display and reflected by a reference projection plane.

12. An image display unit according to claim 10, which uses a plurality of correction curves for a plurality of projection planes.

14. An image display unit according to claim 10, wherein the amount of correction of input image data corrected by said correction curve(s) is adjustable.

15. An image display unit according to claim 10, wherein said correction curve(s) is subjected to a rounding process in a high graduation region.

11. An image display unit for performing an image processing for an inputted image data, taking into account characteristics of a projection plane, wherein the image display unit performs the image processing for the inputted data based on a correction curve, which is sequentially generated by sequentially repeating a method for generating the correction curve comprising:

a measuring step of measuring a reflection characteristic for each color component of an output provided from said image display unit and reflected by a predetermined projection plane and a reflection characteristic for each color component of the output provided from said image display and reflected by a reference projection plane; and

a correction curve generating step of generating a correction curve for correcting the inputted image data so as to eliminate a difference between the measured reflection characteristic for each color component reflected by the predetermined projection plane and a reflection characteristic for each color component reflected by a reference projection plane.

16. An image display unit according to claim 15, wherein the degree of said rounding process is adjustable.

17. An image display unit according to claim 12, including a selection means of selecting one correction curve from among said plural correction curves on the basis of a reflection characteristic for each color component reflected by a projection plane, and wherein an image processing is performed for input image data on the basis of the selected correction curve.

18. An image display unit according to claim 17, further including a means of inputting the reflection characteristic for each color component reflected by the projection plane in said selection means.

19. An image display unit according to claim 17, further including a means of measuring the reflection characteristic for each color component reflected by the projection plane in said selection means.

13. An image display unit for performing an image processing for an inputted image data, taking into account characteristics of a projection plane, wherein the image display unit comprises a storage means for storing a plurality of correction curves, which are generated by repeating a method for generating the correction curve with respect to a plurality of projection plane, comprising:

a measuring step of measuring a reflection characteristic for each color component of an output provided from said image display unit and reflected by a predetermined projection plane and a reflection characteristic for each color component of the output provided from said image display and reflected by a reference projection plane; and

a correction curve generating step of generating a correction curve for correcting the inputted image data so as to eliminate a difference between the measured reflection characteristic for each color component reflected by the predetermined projection plane and a reflection characteristic for each color component reflected by a reference projection plane.

20. A computer-readable medium having a program of instructions for execution by the computer to perform an image processing for image data inputted to an image display unit, taking into account characteristics of a projection plane with an output from said image display unit projected thereon, wherein said image processing corrects input image data by using a correction curve fox eliminating a difference between a reflection characteristic for each color component of an output provided from said image display unit and reflected by a predetermined projection plane and a reflection characteristic for each color component of the output provided from said image display and reflected by a reference projection plane.

21. A computer-readable medium according to claim 20, which uses a plurality of correction curves for a plurality of projection planes.

22. A computer-readable medium according to claim 20, wherein the amount of correction of input image data corrected by said correction curve(s) is adjustable.

23. A computer-readable medium according to claim 20, wherein said correction curve(s) is subjected to a rounding process in a high graduation region.

24. A computer-readable medium according to claim 28, wherein the degree of said rounding process is adjustable.

25. A computer-readable medium according to claim 21, including a selection processing of selecting one correction curve from among said plural correction curves on the basis of a reflection characteristic for each color component reflected by a projection plane, and wherein an image processing is performed for input image data on the basis of the selected correction curve.

26. A computer-readable medium according to claim 25, further including a processing of inputting the reflection characteristic for each color component reflected by the projection plane in said selection processing.

27. A computer-readable medium according to claim 25, further including a processing of measuring the reflection characteristic for each color component reflected by the projection plane in said selection processing.

29. A computer-readable medium according to claim 28, which uses a plurality of correction curves for a plurality of projection planes.

30. A computer-readable medium according to claim 28, wherein the amount of correction of input image data corrected by said correction curve(s) is adjustable.

31. A computer-readable medium according to claim 28, wherein said correction curve(s) is subjected to a rounding process in a high graduation region.

32. A computer-readable medium according to claim 31, wherein the degree of said rounding process is adjustable.

28. A computer-readable medium storing a correction curve for performing an image processing for image data inputted to an image display unit, taking into account characteristics of a projection plane with an output from said image display unit projected thereon, wherein said correction curve eliminates a difference between a reflection characteristic for each color component of an output provided from said image display unit and reflected by a predetermined projection plane and a reflection characteristic for each color component of the output provided from said image display and reflected by a reference projection plane.