CN110610114B - Optical fingerprint identification method - Google Patents
Optical fingerprint identification method Download PDFInfo
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- CN110610114B CN110610114B CN201810612274.4A CN201810612274A CN110610114B CN 110610114 B CN110610114 B CN 110610114B CN 201810612274 A CN201810612274 A CN 201810612274A CN 110610114 B CN110610114 B CN 110610114B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 title claims abstract description 16
- 239000011521 glass Substances 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Abstract
The invention relates to an optical fingerprint identification method, which is used for capturing fingerprint images outside a fingerprint contact surface and using the non-contact captured images for fingerprint identification; or capturing the fingerprint images of the contact surface and the outside of the contact surface, and using the captured images of the contact surface and the outside of the contact surface for fingerprint identification.
Description
Technical Field
The invention relates to the technical field of fingerprint identification, in particular to an optical fingerprint identification method.
Background
The current fingerprint recognition schemes include optical technology, silicon technology (capacitive/radio frequency), ultrasonic technology, and the like. Optical technology employs optical imaging devices based on the principle of total reflection of light (FTIR). The light irradiates the glass surface pressed with the fingerprint, the reflected light is obtained by the image sensor, and the quantity of the reflected light depends on the depths of fingerprint ridges and valleys pressed on the glass surface and the grease and moisture between the skin and the glass. Light rays are reflected to the image sensor after being emitted to the center of the valley through the glass and then are totally reflected at the interface between the glass and the air, and the light rays emitted to the ridge are not totally reflected but are absorbed by the contact surface of the ridge and the glass or are diffusely reflected to the other center, so that an image of the fingerprint is formed on the image sensor. The existing fingerprint identification method has slow fingerprint identification speed, and is difficult to meet the requirements. Therefore, a new optical fingerprint acquisition device is needed to solve the problems of low fingerprint identification and unlocking speed in the prior art.
Disclosure of Invention
The invention aims to provide an optical fingerprint identification method which improves the unlocking speed of an optical fingerprint.
In order to solve the above technical problems, the present invention provides an optical fingerprint identification method, including:
capturing a fingerprint image outside the contact surface of the fingerprint, and using the non-contact captured image for fingerprint identification;
or capturing the fingerprint images of the contact surface and the outside of the contact surface, and using the captured images of the contact surface and the outside of the contact surface for fingerprint identification.
Optionally, a fingerprint identification module is used for acquiring fingerprint images, and a plurality of fingerprint images are captured and acquired through automatic focusing of the fingerprint identification module.
Optionally, the fingerprint identification module splices the plurality of fingerprint images to obtain clear and complete fingerprint images.
Optionally, the fingerprint identification module includes an image sensor and a proximity sensor, the proximity sensor obtains a distance between the fingerprint and a surface of the fingerprint identification module, and when the distance is out of a preset range, the image sensor is in a low-frame-rate low-power-consumption mode, and does not capture a fingerprint image; and when the distance is within a preset range, the image sensor is in a high-frame-rate high-power-consumption mode, and fingerprint images are captured.
Optionally, the fingerprint identification module further comprises a voice coil motor, and when the distance is within a preset range, the image sensor captures a fingerprint image and feeds the fingerprint image back to the voice coil motor, and automatic focusing is started.
Optionally, the preset range is 1 cm-10 cm.
Compared with the prior art, the optical fingerprint identification method has the following beneficial effects:
in the invention, in the process of fingerprint unlocking, capturing a fingerprint image outside a fingerprint contact surface, and using the non-contact captured image for fingerprint identification; and capturing fingerprint images on the contact surface and the outside of the contact surface, and using the captured images on the contact surface and the outside of the contact surface for fingerprint identification to improve the speed of fingerprint unlocking.
Drawings
FIG. 1 (a) is a schematic diagram of an embodiment of the present invention when the finger print is not in contact;
FIG. 1 (b) is a schematic diagram of finger contact according to an embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present invention may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, which are only examples for convenience of illustration, and should not be construed as limiting the scope of the invention.
In order to make the above objects, features and advantages of the present invention more comprehensible, the following detailed description of the optical fingerprint identification method of the present invention refers to the accompanying drawings.
Referring to fig. 1 (a), the optical fingerprint recognition method of the present invention captures a fingerprint image by using a fingerprint recognition module 10, wherein the fingerprint recognition module 10 includes an image sensor for acquiring a fingerprint image on a finger 20, captures a fingerprint image outside a contact surface of the fingerprint when the fingerprint does not contact the fingerprint recognition module 10, and uses the non-contact captured image for fingerprint recognition.
Specifically, the fingerprint recognition module 10 in the present invention has a Voice Coil Motor (VCM) structure, and is capable of Auto focusing (Auto Focus), when the finger 20 approaches the fingerprint recognition module 10, a plurality of fingerprint images are captured and acquired through the Auto focusing function of the fingerprint recognition module, and the fingerprint images are spliced to obtain a clear and complete fingerprint image, and the fingerprint image is used for fingerprint recognition and unlocking, and the unlocking is completed when the finger does not contact the fingerprint recognition module.
In addition, the fingerprint recognition module 10 includes a proximity sensor (not shown in the figure), and the proximity sensor obtains a distance H between the fingerprint and the surface of the fingerprint recognition module, and when the distance H is outside a preset range, for example, the preset range is 1cm to 10cm. The image sensor is in a low frame rate low power mode and does not capture fingerprint images. When the distance is within a preset range H, the image sensor is in a high-frame-rate high-power-consumption mode, and captures fingerprint images, so that power consumption can be saved. Of course, the preset range in the present invention is not limited to this, and may be, for example, 10cm or more, which is also within the scope of the present invention.
Further, when the distance is within the preset range H, the image sensor captures fingerprint images and feeds the fingerprint images back to the voice coil motor, automatic focusing of the voice coil motor is started, further continuous capturing is carried out on the fingerprint images, the captured fingerprint images are spliced to obtain clear and complete fingerprint images, and the fingerprint identification process is completed. According to the fingerprint unlocking method and device, when the fingerprint identification module is not contacted with the finger, the fingerprint identification process can be completed, fingerprint unlocking is performed, unlocking time is shortened, and fingerprint unlocking speed is greatly improved.
With continued reference to fig. 1 (b), another fingerprint identification method of the present invention includes capturing fingerprint images of a contact surface and a contact surface of a fingerprint, that is, capturing fingerprint images of a finger when the finger does not contact the fingerprint identification module and capturing fingerprint images of the finger when the finger contacts the fingerprint identification module, respectively, using the captured images of the contact surface and the contact surface for fingerprint identification, for example, stitching a plurality of fingerprint images obtained when the finger does not contact and when the finger contacts, and using the stitched images for fingerprint unlocking, while ensuring speed and accuracy of fingerprint identification.
In summary, in the fingerprint unlocking process, the fingerprint image outside the contact surface of the fingerprint is captured, and the non-contact captured image is used for fingerprint identification; and capturing fingerprint images on the contact surface and the outside of the contact surface, and using the captured images on the contact surface and the outside of the contact surface for fingerprint identification to improve the speed of fingerprint unlocking.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (3)
1. An optical fingerprint identification method is characterized in that:
the fingerprint recognition module is adopted to capture fingerprint images of the contact surface and the outside of the contact surface respectively, namely, fingerprint images when the finger does not contact the fingerprint recognition module and fingerprint images when the finger contacts the fingerprint recognition module are captured respectively, and a plurality of captured images outside of the contact surface and the outside of the contact surface are spliced for fingerprint recognition; the fingerprint identification module comprises an image sensor and a proximity sensor, wherein the fingerprint image capturing mode outside the contact surface is as follows: the method comprises the steps that a proximity sensor obtains the distance between a fingerprint and the surface of a fingerprint identification module, and when the distance is out of a preset range, an image sensor is in a low-frame-rate low-power consumption mode and does not capture a fingerprint image; when the distance is within a preset range, the image sensor is in a high-frame-rate high-power-consumption mode, and a fingerprint image is captured; the fingerprint identification module further comprises a voice coil motor, and when the distance is within a preset range, the image sensor captures a fingerprint image and feeds the fingerprint image back to the voice coil motor to start automatic focusing.
2. The method for recognizing optical fingerprints according to claim 1, wherein the fingerprint recognition module is used to acquire fingerprint images, and the plurality of fingerprint images are captured and acquired by auto-focusing of the fingerprint recognition module.
3. The method for recognizing an optical fingerprint according to claim 1, wherein the predetermined range is 1cm to 10cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810612274.4A CN110610114B (en) | 2018-06-14 | 2018-06-14 | Optical fingerprint identification method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810612274.4A CN110610114B (en) | 2018-06-14 | 2018-06-14 | Optical fingerprint identification method |
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| CN110610114A CN110610114A (en) | 2019-12-24 |
| CN110610114B true CN110610114B (en) | 2024-01-16 |
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