Projector, display system, image correction method, and colorimetric method

A display system comprising:

• a first projector including
• a first projection section,
• a first spectral imaging section having a first imaging element and a first spectral element, and
• a first control section configured to determine a color and a gray level of an image to be projected by the first projection section, then make the first projection section project the image corresponding to the color and the gray level determined, set a measurement condition determined based on the color of the image determined to the first spectral imaging section, and then make the first spectral imaging section take the image projected by the first projection section to obtain first taken image information;
• and
• a second projector including
• a second projection section,
• a second spectral imaging section having a second imaging element and a second spectral element, and
• a second control section configured to determine a color and a gray level of an image to be projected by the second projection section, then make the second projection section project the image corresponding to the color and the gray level determined, set a measurement condition determined based on the color of the image determined to the second spectral imaging section, and then make the second spectral imaging section take the image projected by the second projection section to obtain second taken image information, wherein
• the first control section changes at least one of the color and the gray level of the image to be projected by the first projection section a plurality of times to obtain a plurality of pieces of the first taken image information output by the first spectral imaging section,
• the second control section changes at least one of the color and the gray level of the image to be projected by the second projection section a plurality of times to obtain a plurality of pieces of the second taken image information output by the second spectral imaging section, and
• the first control section generates a first correction parameter used to correct an image to be projected by the first projector and a second correction parameter used to correct an image to be projected by the second projector based on the plurality of pieces of the first taken image information obtained, and the plurality of pieces of the second taken image information received from the second control section.

An image correction method in a display system including a first projector having a first projection section and a first spectral imaging section having a first imaging element and a first spectral element, and a second projector having a second projection section and a second spectral imaging section having a second imaging element and a second spectral element, the method comprising:

• a first determination step of determining a color and a gray level of an image to be projected by the first projection section in the first projector;
• a first projection step of making the first projection section project an image corresponding to the color and the gray level determined in the first projector;
• a first acquisition step of setting a measurement condition determined based on the color of the image determined to the first spectral imaging section, and then making the first spectral imaging section take the image projected by the first projection section to obtain first taken image information in the first projector;
• a second determination step of determining a color and a gray level of an image to be projected by the second projection section in the second projector;
• a second projection step of making the second projection section project an image corresponding to the color and the gray level determined in the second projector;
• a second acquisition step of setting a measurement condition determined based on the color of the image determined to the second spectral imaging section, and then making the second spectral imaging section take the image projected by the second projection section to obtain second taken image information in the second projector;
• and
• a generation step of generating a first correction parameter used to correct an image to be projected by the first projector and a second correction parameter used to correct an image to be projected by the second projector in the first projector, wherein
• in the first projector, at least one of the color and the gray level of the image to be projected by the first projection section is changed a plurality of times in the first determination step, the first projection section is made to project the images with the color and the gray level at least one of which was changed in the first projection step, and the first spectral imaging section is made to take the images projected by the first projection section to obtain a plurality of pieces of the first taken image information in the first acquisition step,
• in the second projector, at least one of the color and the gray level of the image to be projected by the second projection section is changed a plurality of times in the second determination step, the second projection section is made to project the images with the color and the gray level at least one of which was changed in the second projection step, and the second spectral imaging section is made to take the images projected by the second projection section to obtain a plurality of pieces of the second taken image information in the second acquisition step, and
• in the first projector, the first correction parameter and the second correction parameter are generated in the generation step based on the plurality of pieces of the first taken image information obtained, and the plurality of pieces of the second taken image information received from the second projector.

A colorimetric method of performing colorimetry with a spectral imaging device including an imaging element and a spectral element, the method comprising:

• an imaging step of taking an image displayed with the spectral imaging device while changing a spectral wavelength of the spectral element at first wavelength intervals within a wavelength range set based on the image to generate imaging data;
• a calculation step of calculating estimation values of spectra at second wavelength intervals shorter than the first wavelength interval based on the imaging data generated in the imaging step and an estimation matrix used for estimation of the spectra;
• and
• a generation step of generating a correction parameter used to correct an image datum which an image to be displayed derives from based on the estimation values of the spectra calculated in the calculation step.