Fingerprint direction field obtaining method based on structure tensor
A technology of structure tensor and acquisition method, applied in the field of image processing, can solve problems such as large amount of calculation and unsatisfactory speed performance
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[0036] In order to describe content of the present invention conveniently, at first some prior art terms are described:
[0037] Fingerprints: bumpy lines on the skin on the front of the ends of fingers.
[0038] Grayscale image: An image that contains only brightness information without any other color information.
[0039] First-order grayscale difference: In a grayscale image, the grayscale difference of adjacent pixels in a certain direction is used as the first-order difference value; the first-order difference can highlight the vertical edge information of the image, which is convenient for edge extraction.
[0040] Gradient image: a matrix composed of the gradient at each pixel in the image; the gradient reflects the degree of change of the pixels in the image, and is usually used to detect the edge of the image.
[0041] Structure tensor: The structure tensor is a symmetrical two-dimensional positive definite matrix, which comes from the analytical solution of the non...
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