Device and method for analyzing and reconstructing three-dimensional fingerprints by using condensed micro-droplets
A micro-droplet and fingerprint technology, which is applied to cleaning methods using liquids, optical devices, chemical instruments and methods, etc., can solve the problems of low accuracy, duplication, fragility, etc., achieve compact and simple devices, and improve refrigeration performance. , The effect of the simple detection method
Pending Publication Date: 2022-01-28
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology
However, the traditional fingerprint identification technology is to obtain two-dimensional fingerprint images and process and identify them. Although two-dimensional fingerprint identification has been proved to be an efficient and accurate identification method, there are still some inherent disadvantages: such as being affected by light Serious; human factors such as finger stains, scars, dryness, and humidity during collection will affect the recognition accuracy; there is a risk of being copied
These three technologies have their own advantages and disadvantages. The optical type is cheap, but the accuracy is not high; the capacitive type is small, but relatively fragile; the ultrasonic type is high in accuracy, but the cost is high
The above three methods obtain two-dimensional fingerprint information, and there is no mature technology for obtaining three-dimensional fingerprint information in the market
Method used
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Embodiment 1
[0049] Step (1): Take a piece of 3×3cm 2 Silicon wafers were ultrasonically cleaned by an ultrasonic cleaner for 10 minutes. Subsequently, the ultrasonically cleaned samples were rinsed with isopropanol (IPA) and deionized water in sequence, and dried with nitrogen.
[0050] Step (2): Use isopropyl alcohol (IPA) and deionized water to clean the oil stains in the fingerprint 7, and dry the fingerprint 7 with nitrogen.
[0051] Step (3): Place the silicon chip in step (1) on the semiconductor cooling chip 2, the working environment temperature is 20°C, and the relative humidity is 60%, then the temperature of the cold end of the semiconductor cooling chip 2 is set to the real-time dew point temperature of 12°C, Press the clean finger cleaned and dried in step (2) on the silicon wafer, and use a CCD camera to record the water drops 4 generated between the fingerprints 7 .
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The invention relates to analysis and reconstruction of three-dimensional fingerprints, in particular to a device and method for analyzing and reconstructing three-dimensional fingerprints by means of condensed micro-droplets, and the device comprises a fingerprint pressing block and a semiconductor chilling plate. The fingerprint pressing block is arranged on one side of the cold end of the semiconductor chilling plate, and the method comprises the following steps that S1, the fingerprint pressing block is cleaned and dried, and the fingerprint pressing block is arranged on one side of the cold end of the semiconductor chilling plate; S2, fingerprints are cleaned and dried, and the fingerprints are pressed on a fingerprint pressing block; and S3, a two-dimensional fingerprint image is recorded, the size of a water drop generated between fingerprints is measured, and a three-dimensional fingerprint image is constructed according to the obtained two-dimensional fingerprint image and the size of the water drop. Compared with the prior art, the method has the advantages that the three-dimensional fingerprint is analyzed and reconstructed by using the condensed micro-droplets, high-precision and low-cost three-dimensional fingerprint construction is realized, and the method can be used for personal information identification and criminal investigation.
Description
technical field [0001] The invention relates to an analysis and reconstruction of a three-dimensional fingerprint, in particular to a device and method for analyzing and reconstructing a three-dimensional fingerprint by using condensed micro-droplets. Background technique [0002] Fingerprint identification technology or fingerprint identification technology is to match a person with his fingerprints, and by comparing his fingerprints with pre-saved fingerprints, his true identity can be verified. It is precisely because the skin texture of each person (including fingerprints) is different in pattern, breakpoint and intersection point and remains unchanged throughout life, so relying on this uniqueness and stability, fingerprint recognition technology can be created. [0003] Fingerprint identification technology widely exists in our daily life. Public security criminal police can use it to arrest criminals, and ordinary citizens can use it to protect their information secur...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G06V40/13G01B11/02B08B3/08B08B3/12F25B21/02
CPCG01B11/02B08B3/12B08B3/08F25B21/02
Inventor 赵玉刚顾恬张晓东
Owner UNIV OF SHANGHAI FOR SCI & TECH