Patent ID: 8630506

Claim:
An image correcting device for creating a corrected image through geometrical correction of an input image, comprising: an input interface configured to input the input image; a memory configured to store the input image; a geometrical correcting circuit configured to subject the input image stored in the memory to geometrical correction by: calculating a pair of angles (θ, φ) which corresponds to each pixel position (u, v) on an output image as the corrected image; calculating a light direction (X, Y, Z) based on a line of intersection between a plane obtained by rotating a YZ plane by the angle θ about Y axis and a plane obtained by rotating an XZ plane by the angle φ about X axis, in a three dimensional Cartesian coordinate system with an origin at a projection center of the input image; calculating a position on the input image corresponding to the light direction, as a resampling position; and associating the resampling position with the pixel position on the output image; and an output interface configured to output the input image corrected by the geometrical correcting circuit, as the corrected image, wherein a ratio of a first angle change rate of each of the angles (θ, φ) at the edge of the output image to a second angle change rate of each of the angles (θ, φ) at the center of the output image is within a predetermined numerical range.