Color calibration device, color calibration system, color calibration hologram, color calibration method, and program

A color calibration system, comprising:

• a color calibration hologram that emits diffracted light at different frequencies corresponding to an observation angle;
• a spectral distribution calculation unit that obtains respective spectral distribution of the diffracted light from the color calibration hologram;
• a camera sensitivity function estimation unit that estimates spectral sensitivity of an imaging device from the respective spectral distribution of the diffracted light and each captured image of the diffracted light;
• and
• a color calibration unit that calibrates difference in color of a first imaging device relative to a second imaging device different from the first imaging device using the estimated spectral sensitivity.

A color calibration method, calibrating colors in a captured image of a first imaging device between different imaging devices using a hologram emitting diffracted light at different frequencies corresponding to an observation angle, the color calibration method comprising:

• a step of calculating diffracted light spectral distribution to obtain respective diffracted light spectral distribution of the diffracted light from the hologram;
• a step of estimating a spectral sensitivity to estimate spectral sensitivity of the imaging device from the respective diffracted light spectral distribution of the diffracted light and each captured image of the diffracted light;
• and
• a step of calibrating colors to calibrate difference in color of the first imaging device relative to a second imaging device different from the first imaging device using the estimated spectral sensitivity.

A program causing a computer to execute an operation to calibrate colors in a captured image of a first imaging device between different imaging devices using a hologram emitting diffracted light at different frequencies corresponding to an observation angle, the program causing the computer to operate as:

• a diffracted light spectral distribution calculation means to obtain respective diffracted light spectral distribution of the diffracted light from the hologram;
• a spectral sensitivity estimation means to estimate spectral sensitivity of the imaging device from the respective diffracted light spectral distribution of the diffracted light and each captured image of the diffracted light;
• and
• a color calibration means to calibrate difference in color of the first imaging device relative to a second imaging device different from the first imaging device using the estimated spectral sensitivity.