Image correction apparatus and image correction method

An image correction method, comprising:

• extracting, by a processor, a region in which a hand is captured in an image;
• obtaining, by the processor, a shift amount from a point on the image corresponding to an optical axis of an imaging unit included in an image acquiring device for generating the image to a reference point having a predetermined positional relationship with the region in which the hand is captured;
• calculating, by the processor, an inclination correction angle by which a plane in parallel to an imaging plane of the imaging unit is rotated to be orthogonal to a direction directing from the imaging unit toward a point in the real space corresponding to the reference point in accordance with the shift amount;
• calculating, by the processor, in accordance with the inclination correction angle, a correction amount for placing the hand to face the imaging unit;
• correcting, by the processor, for each pixel included in a region in which the hand is captured in the image, an estimated coordinate representing a position of a point in a real space calculated based on the pixel in accordance with the correction amount;
• and
• projecting, by the processor, each of the points after the correction on a corrected image to generate the corrected image.

A non-transitory computer-readable recording medium having recorded thereon a computer program for image correction, the computer program causing a computer to execute a process comprising:

• extracting a region in which a hand is captured in an image;
• obtaining a shift amount from a point on the image corresponding to an optical axis of an imaging unit included in an image acquiring device for generating the image to a reference point having a predetermined positional relationship with the region in which the hand is captured;
• calculating an inclination correction angle by which a plane in parallel to an imaging plane of the imaging unit is rotated to be orthogonal to a direction directing from the imaging unit toward a point in the real space corresponding to the reference point in accordance with the shift amount;
• calculating, in accordance with the inclination correction angle, a correction amount for placing the hand to face the imaging unit;
• correcting, for each pixel included in a region in which the hand is captured in the image, an estimated coordinate representing a position of a point in a real space calculated based on the pixel in accordance with the correction amount;
• and
• projecting each of the points after the correction on a corrected image to generate the corrected image.