Patent ID: 6324297
Filing Date: 2001-11-27
Classification: G06K,G06T

Abstract:
A skin pattern feature extracting apparatus for displaying skin pattern images and assisting an operator to input their features, comprising:perspective transformation instruction input means for inputting operator's perspective transformation instructions thereto, wherein the perspective transformation instructions comprise parameter data corresponding to an inclination angle, .phi., and a rotation angle, .theta., of a given image, and wherein the perspective transformation uses affine transformations for permitting clearer observation of the structures of a skin pattern, a first affine transformation rotating the given image by the angle .theta., resulting in an image where a direction of ridges appearing in the given image are transformed from a horizontal direction to a vertical direction, a second affine transformation compressing the resulting image in the a vertical, Y, direction by r=cos .theta., 0<r<1), where r is a compression ratio;perspective transforming means for executing perspective transformation on a given skin pattern image according to the inputted instructions; andperspective transformed image displaying means for displaying the result of the perspective transformation of the skin pattern image to the operator.