Patent ID: 7577278
Filing Date: 2009-08-18
Classification: G06K

Abstract:
1. A method of filtering an image with bar-shaped structures by means of Gabor filters, which are formed in the spatial domain by a two-dimensional Gaussian bell-shaped curve on which a cosine function is superimposed in a main direction, characterized in that; an image is captured by a sensor and buffered in a buffer, using a program that is stored in a program memory, the image, which is buffered in the buffer, is divided into a plurality of original, non-overlapping tiles of a known side length, using the program that is stored in the program memory, a predominant direction of the bar-shaped structures is determined for each tile and the filtration is undertaken in such a way that one tile at a time is rotated until the predominant direction lies at right angles to the main direction of the Gabor filter, using the program that is stored in the program memory, one filtration takes place in the main direction and another filtration takes place at right angles to this; wherein in order to filter a tile of said known side length, that does not overlap with adjacent tiles, a larger tile is formed that partially overlaps the adjacent tiles and is of a size having a diagonal of at least double the known side length of the original tile, and after the rotation, a block having a diagonal corresponding to the larger tile is buffered and filtration of the buffered block is performed in a square having a side length corresponding to at least a diagonal of said original tile; and using the program that is stored in the program memory, the filtered tile is rotated back again to obtain a filtered tile of said known side length.