Image correction apparatus that performs color matching between multiple image pickup apparatuses that take image of display apparatus, image pickup system, control method, and storage medium

An image pickup system that includes a plurality of image pickup apparatuses, a display apparatus, and an image correction apparatus communicatively connected to the image pickup apparatuses and the display apparatus, the image pickup system comprising:

• at least one memory that stores a set of instructions;
• and
• at least one processor that is configured to, based on the instructions,
• cause each of the plurality of image pickup apparatuses to:
• pick up a display image displayed on a display surface of a display unit in accordance with a shooting instruction and generate a first picked-up image;
• and
• subject the generated first picked-up image to correction based on color/brightness correction values,
• wherein each of the plurality of image pickup apparatuses receives the shooting instruction, sends the first picked-up image to the image correction apparatus, receives the color/brightness correction values, and sends a second picked-up image obtained by subjecting the first picked-up image to the correction to the image correction apparatus, and
• cause the image correction apparatus to:
• store viewing angle correction values for use in correcting viewing angle characteristics resulting from positions of the plurality of image pickup apparatuses with respect to the display screen of the display unit to a predetermined viewing angle characteristic;
• and
• after displaying the display image on the display screen of the display unit, send shooting instruction to the plurality of image pickup apparatuses, receive the plurality of first picked-up images sent from the plurality of image pickup apparatuses, send the color/brightness correction values to the plurality of image pickup apparatuses, and receive the plurality of second picked-up images sent from the plurality of image pickup apparatuses,
• wherein the image correction apparatus
• upon receiving the plurality of first picked-up images, generates a plurality of corrected images by subjecting the plurality of first picked-up images to correction using the viewing angle correction values,
• calculates color correction values for use in color matching between the plurality of corrected images,
• calculates color/brightness correction values for use in color/brightness matching between the plurality of first picked-up images using the color correction values and the viewing angle correction values, and
• upon receiving the plurality of second picked-up images sent from the plurality of image pickup apparatuses, generates an image including the plurality of second picked-up images and sends an instruction to display the generated image to the display apparatus.

A control method for an image correction apparatus that performs color matching between a plurality of image pickup apparatuses, using a plurality of picked-up images which are generated by the plurality of image pickup apparatuses shooting a display image on a display screen of a display unit, the control method comprising:

• storing viewing angle correction values for use in correcting viewing angle characteristics resulting from positions of the plurality of image pickup apparatuses with respect to the display screen of the display unit, to a predetermined viewing angle characteristic;
• subjecting the display images in the plurality of picked-up images to correction using the viewing angle correction values to generate a plurality of corrected images;
• calculating color correction values for use in color matching between the plurality of corrected images,
• after displaying, on the display screen, a first pattern image in an area where the display image is displayed, detecting the first pattern image from each of a plurality of other picked-up images generated by causing the plurality of images pickup apparatuses to shoot the displayed first pattern image;
• calculating the viewing angle correction values to be stored from the plurality of first pattern images detected from the plurality of other picked-up images;
• after displaying a second pattern image as the display image on the display screen, detecting the second pattern image from each of the plurality of picked-up images generated by causing the plurality of images pickup apparatuses to shoot the displayed second pattern;
• and
• subjecting the plurality of second pattern images detected from the plurality of picked-up images to correction using the calculated viewing angle correction values, to generate the plurality of corrected images for use in calculating the color correction values.

A computer-readable non-transitory storage medium storing a computer-executable program for executing a control method for an image correction apparatus that performs color matching between a plurality of image pickup apparatuses, using a plurality of picked-up images which are generated by the plurality of image pickup apparatuses shooting a display image on a display screen of a display unit, the control method comprising:

• storing viewing angle correction values for use in correcting viewing angle characteristics resulting from positions of the plurality of image pickup apparatuses with respect to the display screen of the display unit, to a predetermined viewing angle characteristic;
• subjecting the display images in the plurality of picked-up images to correction using the viewing angle correction values to generate a plurality of corrected images;
• calculating color correction values for use in color matching between the plurality of corrected images,
• after displaying, on the display screen, a first pattern image in an area where the display image is displayed, detecting the first pattern image from each of a plurality of other picked-up images generated by causing the plurality of images pickup apparatuses to shoot the displayed first pattern image;
• calculating the viewing angle correction values to be stored from the plurality of first pattern images detected from the plurality of other picked-up images;
• after displaying a second pattern image as the display image on the display screen, detecting the second pattern image from each of the plurality of picked-up images generated by causing the plurality of images pickup apparatuses to shoot the displayed second pattern;
• and
• subjecting the plurality of second pattern images detected from the plurality of picked-up images to correction using the calculated viewing angle correction values, to generate the plurality of corrected images for use in calculating the color correction values.