Color reproducing system for reproducing a color of an object under illumination light

A color reproduction system which can sense a predetermined object as a color image, perform color correction of the sensed color image, and perform data transfer through a line, comprising:

• a color camera for sensing the object under photographing illumination light;
• a simplified spectrophotometer for measuring a spectrum of the photographing illumination light;
• an illumination light calorimeter for measuring tristimulus values of observation illumination light on an object observation side, and transferring the tristimulus value data of the observation illumination light to a color correction device through a line;
• a color correction device for calculating tristimulus values of the object under the virtual illumination light spectrum generated on the basis of the transferred tristimulus values of the observation illumination light, and converting the tristimulus values into a monitor signal by using monitor profile data;
• and
• a monitor for displaying a color image including an object image color-corrected by the color correction device.

A color reproduction system which can sense a predetermined object as a color image, perform color correction of the sensed color image, and perform data transfer through a line, comprising:

• a color camera for sensing the object under photographing illumination light;
• a simplified spectrophotometer for measuring a spectrum of the photographing illumination light;
• an illumination light colorimeter for measuring tristimulus values of observation illumination light on an object observation side, and transferring the tristimulus value data of the observation illumination light to a color correction device through a line;
• a color correction device for calculating tristimulus values of the object under the virtual illumination light spectrum generated on the basis of the transferred tristimulus values of the observation illumination light, and converting the tristimulus values into a monitor signal by using monitor profile data;
• and
• a monitor for displaying a color image including an object image color-corrected by the color correction device;
• wherein the color correction device comprises:
• a storage device storing a basis function ρ of a daylight spectrum, monitor profile data MTP, color matching function data CMF, and spectral sensitivity data h of the RGB color camera in advance;
• a virtual illumination light spectrum calculator for calculating virtual illumination light spectrum data OS from tristimulus values IXYZ of observation illumination light measured by the illumination light colorimeter and the basis function ρ from the storage device;
• a spectral reflectance calculator for calculating spectral reflectance data f of the object from object characteristic data σ and the spectral sensitivity data h from the storage device, RGB image data CRGB input from the RGB color camera, and a photographing illumination light spectrum from a simplified spectrophotometer;
• a tristimulus value calculator for calculating tristimulus value data OXYZ of the object from the color matching function data CMF from the storage device, the virtual illumination light spectrum data OS from the virtual illumination light spectrum calculator, and the spectral reflectance data f from the spectral reflectance calculator;
• and
• an output signal calculator for calculating the RGB image data CRGB serving as the monitor signal from the monitor profile data MTP from the storage device and the tristimulus value data OXYZ from the tristimulus value calculator.

A color reproduction system which can sense a predetermined object as a color image, perform color correction of the sensed color image, and perform data transfer through a line, comprising:

• a color camera for sensing the object under photographing illumination light;
• a simplified spectrophotometer for measuring a spectrum of the photographing illumination light;
• an illumination light colorimeter for measuring tristimulus values of observation illumination light on an object observation side, and transferring the tristimulus value data of the observation illumination light to a color correction device through a line;
• a color correction device for calculating tristimulus values of the object under the virtual illumination light spectrum generated on the basis of the transferred tristimulus values of the observation illumination light, and converting the tristimulus values into a monitor signal by using monitor profile data;
• and
• a monitor for displaying a color image including an object image color-corrected by the color correction device;
• wherein the color correction device comprises:
• a storage device storing the monitor profile data MTP, a color matching function data CMF, and a spectral sensitivity data h of the RGB color camera in advance;
• a virtual illumination light spectrum calculator for calculating a conversion matrix MTX from the tristimulus values IXYZ of the observation illumination light measured by the illumination light measuring device, the monitor profile data MTP from the storage device, and the color matching function data CMF;
• a tristimulus value calculator for calculating the tristimulus value data OXYZ of the object from the conversion matrix MTX from the virtual illumination light spectrum calculator and the RGB image data CRGB input from the RGB color camera;
• and
• an output signal calculator for calculating RGB image data CRGB serving as the monitor signal from the monitor profile data MTP from the storage device and the tristimulus value data OXYZ from the tristimulus value calculator.

A color reproduction system which can sense a predetermined object as a color image, perform color correction of the sensed color image, and perform data transfer through a line, comprising:

• a color camera for sensing the object under photographing illumination light;
• a simplified spectrophotometer for measuring a spectrum of the photographing illumination light;
• an illumination light colorimeter for measuring tristimulus values of observation illumination light on an object observation side, and transferring the tristimulus value data of the observation illumination light to a color correction device through a line;
• a color correction device for calculating tristimulus values of the object under the virtual illumination light spectrum generated on the basis of the transferred tristimulus values of the observation illumination light, and converting the tristimulus values into a monitor signal by using monitor profile data;
• and
• a monitor for displaying a color image including an object image color-corrected by the color correction device;
• wherein the color correction device comprises:
• a storage device storing object characteristic data σ, monitor profile data MTP, color matching function data CMF, standard illumination light spectrum data SS, tristimulus values JXYZ of standard illumination light, and spectral sensitivity data h of the RGB color camera;
• a spectral reflectance calculator for calculating spectral reflectance data f of the object from the object characteristic data σ and spectral sensitivity data h from the storage device, RGB image data CRGB input from the RGB color camera, and photographing illumination light spectrum data MS from the simplified spectrophotometer;
• a tristimulus value calculator for calculating tristimulus values SXYZ of the object under standard illumination light from the spectral reflectance data f from the spectral reflectance calculator and the color matching function data CMF and standard illumination light spectrum data SS from the storage device;
• a corresponding color calculator for calculating tristimulus values CXYZ of a corresponding color of the object from the tristimulus values SXYZ from the tristimulus value calculator, tristimulus values JXYZ of standard illumination light from the storage device, and tristimulus values RXYZ of observation illumination light from the illumination light calorimeter;
• and
• an output signal calculator for calculating RGB image data CRGB serving as the monitor signal from the tristimulus values CXYZ from the corresponding color calculator and the monitor profile data MTP from the storage device.