Claims
- 1. An image processing apparatus for performing an image process so as to visually match a material color with a light source color, comprising:input means for inputting image data regarding the light source color; and converting means for converting the image data regarding said light source color into image data regarding said material color, wherein said converting means executes a conversion process so as to satisfy a relation shown by a curve which monotonously increases and is convex upward on a coordinates plane in which a luminance of the material color is set to an axis of abscissa and a luminance of the light source color is set to an axis of ordinate.
- 2. An apparatus according to claim 1, wherein the following equations of Haubner, P are used in said conversion process of converting the luminance:H=Ct(φ)Ltn−H0(Lu, φ) H0(Lu, φ)=Ct(φ)[S0(φ)+S1(φ)Lun]where,H is sense of brightness of a stimulus Lt; Lt is luminance of an examination field of view of an apparent size, angle of view, φ, expressed by a minute; Lu is luminance of an ambient field of view having an angle of view of 180° around the examination field of view; Ct(φ), S0(φ), S1(φ) are functions, and n is a constant.
- 3. An image processing method of performing an image process so as to visually match a material color with a light source color, comprising:an input step of inputting image data regarding the light source color; and a converting step of converting the image data regarding said light source color into image data regarding the material color, wherein in said converting step, a conversion process is executed so as to satisfy a relation shown by a curve which monotonously increases and is convex upward on a coordinates plane in which a luminance of the material color is set to an axis of abscissa and a luminance of the light source color is set to an axis of ordinate.
- 4. A recording medium which stores a program to realize an image processing method of performing an image process so as to visually match a material color with a light source color, comprising:an input step of inputting image data regarding the light source color; and a converting step of converting the image data regarding said light source color into image data regarding the material color, wherein in said converting step, a conversion process is executed so as to satisfy a relation shown by a curve which monotonously increases and is convex upward on a coordinates plane in which a luminance of the material color is set to an axis of abscissa and a luminance of the light source color is set to an axis of ordinate.
Priority Claims (2)
Number |
Date |
Country |
Kind |
7-255402 |
Oct 1995 |
JP |
|
8-244845 |
Sep 1996 |
JP |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This is a divisional of application Ser. No. 08/724,463, filed on Oct. 1, 1996.
US Referenced Citations (11)
Number |
Name |
Date |
Kind |
4379292 |
Minato et al. |
Apr 1983 |
A |
4773761 |
Sugiyama et al. |
Sep 1988 |
A |
4812903 |
Wagensonner et al. |
Mar 1989 |
A |
5072305 |
Numakura et al. |
Dec 1991 |
A |
5157464 |
Laihanen |
Oct 1992 |
A |
5181105 |
Udagawa et al. |
Jan 1993 |
A |
5254978 |
Beretta |
Oct 1993 |
A |
5363197 |
Ohno et al. |
Nov 1994 |
A |
6118455 |
Hidaka et al. |
Sep 2000 |
A |
6198553 |
Yamamoto et al. |
Mar 2001 |
B1 |
6240204 |
Hidaka et al. |
May 2001 |
B1 |
Foreign Referenced Citations (1)
Number |
Date |
Country |
07258631 |
Oct 1995 |
JP |