Patent ID: 7630584
Filing Date: 2009-12-08
Classification: G06T

Abstract:
1. An image processing apparatus for receiving an inputted image, which is taken by using a converging lens group having an optical zoom mechanism, and for correcting distortion of the image, the image processing apparatus comprising: zoom position acquiring means for acquiring a zoom position representing a lens position condition of the optical zoom mechanism on taking an inputted image; zooming-direction decoding means for decompressing correction parameters associated to the zoom position, which is acquired by the zoom position acquiring means, according to a zoom compression parameter, into which the correction parameters for distortion correction corresponding to each lens position condition is compressed by utilizing zoom partitioning points at which lens position conditions of the optical zoom mechanism are sequentially partitioned into plural levels that are set between a wide-end and a tele-end and that include both the ends; image correction means for correcting distortion of the inputted image according to the correction parameter decompressed by the zooming-direction decoding means; parameter storing means having two storage areas for storing the zoom compression parameter; parameter selecting means for selecting the zoom compression parameter, which is necessary for interpolation calculation by the zooming-direction decoding means, according to chance of the zoom position; storage area selecting means for selecting the storage area that stores the zoom compression parameter selected by the parameter selecting means; and phase calculation means for calculating a relative position of the zoom position which is located between the zoom partitioning points corresponding to the zoom compression parameter selected by the parameter selecting means, as a phase coefficient, wherein the zooming-direction decoding means performs interpolation calculation according to the zoom compression parameter read from the storage areas and to the phase coefficient calculated by the phase calculation means.