US 2006/0132867 A1Published application

Tone reproduction characteristics measuring device for color monitor

OwnerTohru Sugiyama, Tsutomu Nakagawainventors

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Abstract

The tone reproduction characteristics of a color monitor are determined at high precision by visual recognition. A pattern display means (230) displays a test pattern, comprising circular patterns (50) and a background (60), on the screen of the monitor (100) to be measured. In the background (60), a reference pattern, which is generated by a reference pattern generating means (220), is formed of a black-and-white pattern, and has a prescribed reference luminance, is displayed, and in each circular pattern (50), an even pattern with RGB tone values designated by a tone value designating means (210) is displayed. The tone of the even pattern is varied so as to vary in brightness and color by a tone value varying means (240). When the circular patterns (50) become the same in brightness and color as the background (60), an operator provides a coincidence signal to a coincidence signal input means (250). A characteristics computing means (260) computes curves, indicating the tone reproduction characteristics according to the respective colors of R, G, and B, based on the reference luminance and the corresponding tone values at this point. The circular patterns (50) are positioned at a pitch that is in accordance with the spatial frequency sensitivity of human eyes.

Claims47

Dependent claims

A device for measuring tone reproduction characteristics, which indicate a relationship between input signal tone values and actual display luminance of a color monitor (100) having a function of displaying color images using three primary colors of R, G, and B, the tone reproduction characteristics measuring device for color monitor comprising:

tone value designating means (210), designating a combination of tone values of the three primary colors, R, G, and B, for displaying an even pattern of uniform brightness and color in a first attribute region (50);
reference pattern generating means (220) generating a reference pattern in which first sub-regions (61) and second sub-regions (62) are mixed at a prescribed area ratio inside a second attribute region (60), wherein each of the three primary colors, R, G, and B take on a minimum tone value in said first sub-regions and each of the three primary colors, R, G, and B take on a maximum tone value in said second sub-regions;
pattern display means (230) defining a test pattern which is arranged from said first attribute region and said second attribute region being positioned so as to contact each other on a screen of the color monitor, and providing prescribed signals to the color monitor so that an even pattern, based on the combination of tone values designated by said tone value designating means, is displayed in said first attribute region, and said reference pattern, generated by said reference pattern generating means, is displayed in said second attribute region;
tone value varying means (240) varying respective tone values designated by said tone value designating means so as to vary a brightness and a color of the even pattern;
coincidence signal input means (250) inputting, while a varying operation by said tone value varying means is being performed, a coincidence signal indicating a recognition that said first attribute region and said second attribute region are matched in both brightness and color, from an operator who views said test pattern displayed on the screen of the color monitor;
and
characteristics computing means (260) recognizing a combination of tone values designated by said tone value designating means at a point when said coincidence signal is input, as corresponding tone values of the respective primary colors that correspond to a prescribed reference luminance in accordance with said prescribed area ratio, and determining, by computation, tone reproduction characteristics of the respective primary colors based on said reference luminance and said corresponding tone values that correspond to each other.

4 more elements

tone reproduction characteristics storage means (410) storing provisional tone reproduction characteristics;
image data storage means (420) storing image data of a sample image to be used in measurement;
image display means (430) which assumes that the tone reproduction characteristics of the color monitor are to be the provisional tone reproduction characteristics stored in the tone reproduction characteristics storage means, performs prescribed tone corrections on image data stored in the image data storage means so that the sample image will be displayed with correct tone reproduction on the color monitor, and provides corrected image data to the color monitor;
a physical output medium (520) obtained by outputting the sample image on a physical medium based on the image data stored in the image data storage means;
characteristics modifying means (440) receiving instruction inputs, for making a sample image (510) displayed on a screen (500) of the color monitor, and a sample image (530) displayed on the physical output medium (520), close in brightness and color, from an operator who visually compares the two images;
coincidence signal input means (450) inputting a coincidence signal, indicating a recognition that both of the images are matched both in brightness and color, from the operator;
and
characteristics output means (460) outputting the provisional tone reproduction characteristics, stored in the tone reproduction characteristics storage means when the coincidence signal is input, as a formal tone reproduction characteristics of the color monitor.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/559,853Filed 11 Jun 2004
Priority: JP 2003-17062316 Jun 2003
Published: 22 Jun 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G09G 5/003
Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators: details of a display…
G09G 2320/0673
Adjustment of display parameters: for control of gamma adjustment, e.g. selecting another gamma curve
G09G 2320/0693
Adjustment of display parameters: calibration of display systems
G09G
Arrangements or circuits for control of indicating devices using static means to