US 12,200,410 B2
Projection system and color calibration method thereof
Chun-Lin Chien, Hsin-Chu (TW); and Yu-Wen Lo, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Jun. 16, 2022, as Appl. No. 17/841,693.
Claims priority of application No. 202110671026.9 (CN), filed on Jun. 17, 2021.
Prior Publication US 2022/0408066 A1, Dec. 22, 2022
Int. Cl. H04N 9/31 (2006.01)
CPC H04N 9/3182 (2013.01) [H04N 9/3194 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A projection system, comprising a projection device, a camera device, and a processing circuit, wherein
the projection device is configured to project an on-screen display (OSD) menu, wherein the OSD menu comprises options of target selection and calibration;
after the option of target selection is chosen, the projection device projects a projection image having a plurality of regions, one of the plurality of regions of the projection image is configured to be selected as a reference calibration region, and at least one color value of the reference calibration region serves as at least one target value;
after the option of calibration is chosen, the projection device projects a calibration projection image, the calibration projection image comprises a plurality of calibration regions, wherein the plurality of calibration regions of the calibration projection image respectively correspond to the plurality of regions of the projection image,
the camera device is configured to capture the calibration projection image to form a captured image, and
the processing circuit is coupled to the projection device and the camera device and configured to perform a color calibration operation to calibrate color uniformity of the calibration projection image, wherein the processing circuit drives the projection device to project the calibration projection image according to at least one color gain value of each of the calibration regions, drives the camera device to capture the calibration projection image to form the captured image and calculates at least one color value of each of the calibration regions of the calibration projection image in the captured image, and updates the at least one color gain value of each of the calibration regions to the projection device, so that the at least one color value of each of the calibration regions of an entire projection image projected by the projection device approaches the at least one target value,
wherein a color of a background of the calibration projection image is black, a color of the calibration regions is white, and the processing circuit does not calculate any color value of the background of the calibration projection image in the captured image.