Method and system for identifying fingerprint
View Patent ↗The invention discloses a method and system for identifying fingerprint. The method comprises: S 1 : adjusting a camera to focus the camera on a lens; S 2 : capturing continuously by the camera fingerprint images formed by a finger pressing the lens, and sending the fingerprint images to an image processing module; and S 3 : processing the fingerprint images by the image processing module so as to acquire fingerprints. In this way, only a common camera is required for acquiring the fingerprint according to the invention, which is easy to operate at a low cost.
1. A method for identifying fingerprint, comprising:
S 1 : adjusting a camera to focus the camera on a lens;
S 2 : capturing continuously by the camera preview fingerprint images formed by a finger pressing the lens, and sending a fingerprint image to an image processing module; and
S 3 : processing the fingerprint image by the image processing module so as to authenticate the fingerprint;
wherein, step S 2 specifically comprises:
S 20 : determining by the camera whether a brightness component value Y is smaller than a preset value, according to the YUV format;
executing S 23 of capturing the fingerprint image by the camera and sending the fingerprint image to the image processing module, if the brightness component value Y is smaller than the preset value;
otherwise, executing S 24 of capturing continuously by the camera the preview fingerprint images formed by the finger pressing the lens, and returning to the execution of S 20 .
2. The method for identifying a fingerprint according to claim 1 , wherein, before step S 3 , the method further comprises:
S 31 : adhering an anti-fingerprint film on the outside of the lens.
3. The method for identifying a fingerprint according to claim 1 , wherein, before step S 2 , the method further comprises:
S 21 : setting the camera to be in a continuous previewing state; and
S 22 : connecting the camera to the image processing module via a CSI interface.
4. The method for identifying a fingerprint according to claim 1 , wherein, step S 3 specifically comprises:
S 32 : converting the fingerprint image into a black-and-white gray-scale image by the image processing module and performing binarization on the black-and-white gray-scale image so as to obtain a black-and-white texture image;
S 33 : extracting feature values of the black-and-white texture image and sending the feature values to a system backstage for comparison;
S 34 : authenticating the fingerprint according to the comparison result.
5. A system for identifying fingerprint, comprising a camera, a lens and an image processing module, the system performing the following steps:
S 1 : adjusting the camera to focus the camera on the lens;
S 2 : capturing continuously by the camera preview fingerprint images formed by a finger pressing the lens, and sending a fingerprint image to the image processing module; and
S 3 : processing the fingerprint image by the image processing module so as to authenticate the fingerprint;
wherein, step S 2 specifically comprises:
S 20 : determining by the camera whether a brightness component value Y is smaller than a preset value, according to the YUV format;
executing S 23 of capturing the fingerprint image by the camera and sending the fingerprint image to the image processing module, if the brightness component value Y is smaller than the preset value;
otherwise, executing S 24 of capturing continuously by the camera the preview fingerprint images formed by the finger pressing the lens, and returning to the execution of S 20 .
6. The system for identifying fingerprint according to claim 5 , wherein, before step S 3 , the following step is further included:
S 31 : adhering an anti-fingerprint film on the outside of the lens.
7. The system for identifying fingerprint according to claim 5 , wherein, before step S 2 , the following step is further included:
S 21 : setting the camera to be in a continuous previewing state; and
S 22 : connecting the camera to the image processing module via a CSI interface.
8. The system for identifying fingerprint according to claim 5 , wherein, step S 3 specifically comprises:
S 32 : converting the fingerprint image into a black-and-white gray-scale image by the image processing module and performing binarization on the black-and-white gray-scale image so as to obtain a black-and-white texture image;
S 33 : extracting feature values of the black-and-white texture image and sending the feature values to a system backstage for comparison;
S 34 : authenticating the fingerprint according to the comparison result.