Patent ID: 8639052

Claim:
An image projection apparatus comprising: a calculation unit configured to calculate a reduction ratio of an input image based on a projection angle of the image projection apparatus; a band limiting unit configured to use a cutoff frequency to apply a low-pass filter to the input image; a reduction processing unit configured to produce a reduced image by performing reduction processing with respect to the input image which has undergone an application of the low-pass filter by the band limiting unit using the reduction ratio calculated by the calculation unit; and an edge enhancement unit configured to set a frequency characteristic of a bandpass filter based on the cutoff frequency used by the band limiting unit to apply a low-pass filter to the input image, and perform, using the frequency characteristic, edge enhancement processing with respect to the image reduced by the reduction processing unit, wherein trapezoidal distortion of a projection image, projected from the image projection apparatus, due to a projection angle of the image projection apparatus is reduced and the input image and the projection image become more geometrically similar.