Method for correcting an image, storage medium and projection device

A non-transitory computer storage medium storing computer executable instructions which, when executed by one or more processors, cause the one or more processors to:

• determine, in a region in which a projection image projected by a projection device overlaps with a projected image projected through the grating by detection light output from the projection device, diffraction spots having a diameter not equal to a preset value as target diffraction spots, wherein the projection device comprises a grating and a light generation component;
• determine a group of target diffraction spots continuously arranged in a horizontal or vertical direction, as well as diffraction spots having a diameter equal to the preset value that are respectively located on both sides of the group of target diffraction spots, as a region to be corrected;
• determine an angle αi between a plane of an ith diffraction spot and a plane of an (i+1)th diffraction spot that are adjacent in the horizontal or vertical direction in the region to be corrected, wherein i=1, 2, . . . , N, and N is the total number of spots in the region to be corrected;
• and
• determine a corrected projection length of the (i+1)th diffraction spot according to the preset value and angles α1 to αi.

A projection device comprising:

• a grating, a light generation component, a processor, and a storage medium configured to store computer executable instructions;
• wherein the processor is configured to execute the computer executable instructions to:
• determine, in a region in which a projection image projected by the projection device overlaps with a projected image projected through the grating by detection light output from the projection device, diffraction spots having a diameter not equal to a preset value as target diffraction spots;
• determine a group of target diffraction spots continuously arranged in a horizontal or vertical direction, as well as diffraction spots having a diameter equal to the preset value that are respectively located on both sides of the group of target diffraction spots, as a region to be corrected;
• determine an angle αi between a plane of an ith diffraction spot and a plane of an (i+1)th diffraction spot that are adjacent in the horizontal or vertical direction in the region to be corrected, wherein i=1, 2, . . . , N, and N is the total number of spots in the region to be corrected;
• and
• determine a corrected projection length of the (i+1)th diffraction spot according to the preset value and angles α1 to αi.