Patent ID: 8511835
Filing Date: 2013-08-20
Classification: G06T

Abstract:
1. An image processing apparatus comprising: a unit which generates an inverse projection image by performing inverse projection transformation for an input image by using an inverse matrix of a projection transformation matrix which enlarges a size of the input image; a first calculation unit which, when a position of a pixel of interest on the input image is transformed into a position of an inverse projection pixel of interest on the inverse projection image by the inverse projection transformation, calculates a ratio of a distance between pixels around the position of the inverse projection pixel of interest to a distance between pixels around the position of the pixel of interest; a second calculation unit which calculates filter coefficients for a low-pass filter using a product of a Nyquist frequency of the input image and the ratio as a cutoff frequency; and a filter unit which calculates a sum of results obtained by multiplying pixel values of pixels in a pixel array including the position of the pixel of interest in the input image by the filter coefficients, as a pixel value at the position of the pixel of interest in an image having undergone filter processing.