Finger print detection apparatus and detection method thereof
First Claim
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1. A finger print detection method, comprising:
- accessing a part of an input image to generate a checked image;
summing pixel numbers of pixels having gray levels larger than a smallest gray level out of all gray levels in all pixels and smaller than a largest gray level out of all gray levels in all pixels in the checked image to obtain a detected pixel number; and
determining the checked image is a finger print when the detected pixel number is larger than a reference value.
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Abstract
The finger print detection method includes: accessing a part of an input image to generate a checked image; setting a gray level range, wherein each of a gray level of the gray level rang is larger than a minimum gray level and smaller than a maximum gray level; obtaining a detected pixel number of the checked image corresponding to all of the gray levels within the gray level range; and, checking whether the detected pixel number is larger than a product value of a preset ratio and a total pixel number of the checked image or not to determine whether the checked image is a finger print or not.
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Citations
16 Claims
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1. A finger print detection method, comprising:
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accessing a part of an input image to generate a checked image; summing pixel numbers of pixels having gray levels larger than a smallest gray level out of all gray levels in all pixels and smaller than a largest gray level out of all gray levels in all pixels in the checked image to obtain a detected pixel number; and determining the checked image is a finger print when the detected pixel number is larger than a reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A finger print detecting apparatus, comprising:
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a detected pixel number generator, accessing a part of an input image to generate a checked image, and obtaining a detected pixel number of the checked image by summing pixel numbers of pixels having gray levels larger than a smallest gray level out of all gray levels in all pixels and smaller than a largest gray level out of all gray levels in all pixels in the checked image; a reference value generator, generating a reference value by multiplying a preset ratio and a total pixel number of the checked image; a first comparator, coupled to the detected pixel number generator and the reference value generator, and comparing the detected pixel number and the reference value to determine whether the checked image is a finger print or not, wherein, if the detected pixel number is larger than the reference value, the checked image is determined to be the finger print by the first comparator. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification