Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
2001-09-12
2004-09-14
Luu, Matthew (Department: 2672)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C345S600000, C345S690000
Reexamination Certificate
active
06791565
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a correction curve generating method, an image display method, an image display unit, and a storage medium, capable of correcting the influence of an external environment on output image.
2. Description of the Related Art
In case of using an image display unit such as a projector, it is important that an image intended by a producer be reproducible even if an external environment changes. As such a way of thinking of adjusting the visibility of image, there is known a way of thinking called color management in which input and output characteristics of a device are managed to reproduce color. But a concrete color management method taking changes of a working environment into account has not been made clear. Particularly, unless a change in brightness or color of external illumination, or color of projection plane is taken into account as a change of a working environment, it is difficult to make an appropriate reproduction of color. Generally, as the brightness of external illumination increases, the contrast of an output image in an image display unit decreases, making an appropriate color reproduction impossible. For example, even in case of displaying the same white, the displayed white may look somewhat yellowish, depending on the type of a projection plane used.
SUMMARY OF INVENTION
The present invention has been accomplished for solving the above-mentioned problem and it is an object of the invention to provide a correction curve generating method, an image processing method, an image display unit, and a storage medium, capable of making an appropriate color reproduction even with a change in external environment.
According to the present invention as described in claim
1
, a method for generating correction curves for correcting image data inputted to an image display unit, includes: a 1
st
correction curve generating step of generating a 1
st
correction curve based on an tone reproduction characteristic in an illuminated surround of the image display unit under illumination of a predetermined luminance value, the tone reproduction characteristic in an illuminated surround having been approximated to an tone reproduction characteristic in a dark surround of the image display unit; a 2
nd
correction curve generating step of generating a 2
nd
correction curve for eliminating a difference between 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 provided from the image display and reflected by a reference projection plane; and a 3
rd
correction curve generating step of generating a 3
rd
correction curve which eliminates a difference in color components ratios of a predetermined external illumination.
According to the thus constructed method for generating correction curves for correcting image data inputted to an image display unit, a 1
st
correction curve is generated by a 1
st
correction curve generating step based on an tone reproduction characteristic in an illuminated surround of the image display unit under illumination of a predetermined luminance value, the tone reproduction characteristic in an illuminated surround having been approximated to an tone reproduction characteristic in a dark surround of the image display unit. By a 2
nd
correction curve generating step, generated is a 2
nd
correction curve for eliminating a difference between 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 provided from the image display and reflected by a reference projection plane. By a 3
rd
correction curve generating step, generated is a 3
rd
correction curve which eliminates a difference in color components ratios of a predetermined external illumination.
According to the present invention as described in claim
2
, a method for performing an image processing for image data inputted to an image display unit, uses a 1
st
correction curve based on an tone reproduction characteristic in an illuminated surround of the image display unit under illumination of a predetermined luminance value, the tone reproduction characteristic in an illuminated surround having been approximated to an tone reproduction characteristic in a dark surround of the image display unit; a 2
nd
correction curve for eliminating a difference between 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 provided from the image display and reflected by a reference projection plane; and a 3
rd
correction curve which eliminates a difference in color components ratios of a predetermined external illumination.
The present invention as described in claim
3
, is the method according to claim
2
, wherein an image processing for image data using the 3
rd
correction curve is performed after an image processing for image data using the 1
st
correction curve and the 2
nd
correction curve.
The present invention as described in claim
4
, is the method according to claim
2
, having a plurality of 1
st
correction curves obtained using different the predetermined luminance values.
The present invention as described in claim
5
, is the method according to claim
2
, wherein the desired input tone range includes a middle tone range and the vicinity thereof.
The present invention as described in claim
6
, is the method according to claim
2
, wherein the tone reproduction characteristic in a dark surround and the tone reproduction characteristic in an illuminated surround are normalized to a predetermined luminance range, and in the desired input tone range of input image data the normalized tone reproduction characteristic in an illuminated surround is approximated to the normalized tone reproduction characteristic in a dark surround.
The present invention as described in claim
7
, is the method according to claim
2
, wherein the degree of approximation is adjustable.
The present invention as described in claim
8
, is the method according to claim
4
, including a 1
st
selection step of selecting one of plural 1
st
correction curves on the basis of a luminance value of external illumination, and wherein the input image data is subjected to an image processing on the basis of the selected 1
st
correction curve.
According to the present invention as described in claim
9
, the method according to claim
8
, further includes a step of inputting the luminance value of external illumination used in the 1
st
selection step.
According to the present invention as described in claim
10
, the method according to claim
8
, further includes a step of measuring the luminance value of external illumination used in the 1
st
selection step.
According to the present invention as described in claim
11
, an image processing method according to claim
2
, uses a plurality of 2
nd
correction curves for a plurality of projection planes.
The present invention as described in claim
12
, is an image processing method according to claims
2
, wherein the amount of correction of input image data corrected by the 2
nd
correction curve(s) is adjustable.
According to the present invention as described in claim
13
, an image processing method according to claim
11
, includes a 2
nd
selection step of selecting one 2
nd
correction curve from among the plural 2
nd
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 2
nd
correction curve.
According to the present invention as described in claim
14
, an image processing method according to claim
13
, further includes a ste
Lowe Hauptman Gilman & Berner
Luu Matthew
Seiko Epson Corporation
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