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Fingerprint recognition technology and the future of the field of conjecture available

Since Apple released iPhone 5s fingerprint recognition technology began to enter people's lives, then this technology is a very big impression on. In the next two years, fingerprint recognition technology began in the smart phone to the explosive growth trend, fingerprint identification has become a major selling point of the mobile phone conference. So fingerprint recognition in the end is what kind of technology?

Fingerprint identification process

A typical fingerprint identification system should include: Fingerprint Sensor + feature extraction / matching module + feature template library + applications. The fingerprint matching can be divided into two steps, the first is extracted fingerprint characteristics to be verified, then the fingerprint template library and template fingerprints similarity compared to determine whether two fingerprint images from the same finger.

Fingerprint acquisition technology

Fingerprint acquisition technology development is broadly divided into three ways: optical recognition, capacitive sensors, biological radio.

1, the optical recognition

Optical recognition is older fingerprint recognition technology. The optical transmission device based on the light reflected back to the machine onto your fingers and then to get the data, and compare the database to see if the same. Optical recognition can only reach the skin's epidermis, but can not reach the dermis, and by whether the finger clean surface greater impact.

2, the capacitive sensor

Capacitance sensor identification is the use of two capacitors mounted spaced, using fingerprint irregularities, connect or disconnect the two capacitor current when the finger over the fingerprint detection equipment to detect the fingerprint data. Capacitive sensor requirements for a clean finger is still relatively high, and the sensor surface of silicon material more easily damaged. In a technical perspective, the supply of capacitive fingerprint recognition technology for Authentec, Validity, FingerPrintCardsAB (FPC), etc., Authentec Apple bought, Validity also Synaptics acquisitions. Capacitive fingerprint sensor is now the most common technique.

3, biological RF

RF sensors emit a small amount of radio frequency signals through sensors, penetrating finger epidermis lines the inner layer to obtain access to information. This method requires less finger cleanliness. RF is a relatively new technology solutions, radio frequency is capacitively, but limited to patent issues. RF type is the future direction of development.

4, ultrasonic fingerprint recognition

Ultrasonic fingerprint recognition, Qualcomm Mobile World Congress 2015 announced a 3D fingerprint technology. Capacitive sensors with Apple and Samsung GalaxyS6 TouchID use different ultrasonic fingerprint identification using ultrasound to scan fingerprints. Capacitive pressure sensor made of a two-dimensional fingerprint image, and an ultrasound scan of the fingerprint can be more in-depth analysis, even if the finger stained with dirt surface sampling also affect the ultrasound, and even penetrate beneath the surface of the skin to identify a unique fingerprint 3D feature. If your hands are water, sweat and other circumstances, still be able to accurately identify.

Fingerprint collection methods

Regardless of the acquisition, from a user point of view on the use of two kinds of entry ways: push and sliding.

1, sliding

The finger across the sensor from the system will be able to get the entire fingerprint. When a finger is pressed down, unable to complete a one-time image capture. In the acquisition of required acquisition finger across the surface of the finger across the fingerprint collected every piece of image snapshots, these snapshots then spliced ​​to form a complete image of the fingerprint.

Sliding the advantage of low cost, ease of integration, can capture a large area of ​​the image, the application of traditional feature point arithmetic, but the disadvantage is the need for the customer to have a consistent standard action to collect images experience relatively poor, not in the previous application promotion too successful.

2, push

Finger flat on the device in order to obtain a fingerprint image. Usually in order to obtain the entire fingerprint, you must use more than the finger sensor, the whole finger while pressing on the sensor. Push the advantage of the customer experience is good, it can only be used once pressed capture images, with customers in operating practices match mobile applications without education customers. Disadvantages are: high cost, integration is difficult, once acquired image area is relatively small, there is not enough feature points required by sophisticated image comparison algorithm identified.

Obviously, the user point of view, push the simplest, most convenient, after more and more mobile devices will use push-fingerprint program.

Famous fingerprint identification solutions

Famous fingerprint recognition solutions primarily AuthenTec, Synopsys Synaptics Validity, Fingerprint Cards AB, Goodix Department of Science and Technology that several top, we focus on understanding what the Department of the top science and technology, in November last year released Meizu MX4 Pro, because before carrying the world's first Set push sapphire fingerprint chip solution and concern. As Meizu MX4Pro fingerprint identification solution provider, Shenzhen A top science and technology has thus been a lot of media and consumer attention. Top Science and Technology Department of the reason why people pay attention, because the Department of Science and Technology is a top Chinese companies, fingerprint studied completely independent intellectual property rights, make people proud.

Fingerprint recognition can be applied to future areas of conjecture

1. to replace identity cards

Because in recent years, the development of fingerprint identification technology faster and faster, a variety of fingerprint technology can be applied to mobile phones or more portable devices. In recent years, frequently stolen personal identification information, and even criminals used for a variety of criminal activities. The second-generation ID card register their personal fingerprint information, the public security organs and the community can verification of fingerprints, can quickly and accurately use permits units "witnesses identity" finds, can effectively prevent fraudulent use of identity cards, as well as counterfeit happen, altered identity cards and other criminal acts, better protect citizens' legitimate rights and interests are not infringed.

According to statistics, in 2014 the national identity card registration fingerprint market will reach 500 million to 1 billion. Biometric next three years will reach tens of billions of market size, so in the near future, biometrics will act as the "main force" of identifying information, and identity card will be replaced by fingerprint lock. We can use your fingerprint to buy / receive tickets, or to accomplish a variety of things.

2. Control Smart Home

Smart Home is the future of a general orientation of technological development, we can use mobile phones and other devices to home appliances will be turned on or off, but it also raises a question worthy of discussion: how to ensure that control security information? Criminals can steal the owner of the information, and then the owner of the house doors were open / close the lead to theft of property, serious but also endanger the lives of the owner's. The introduction of fingerprint identification, so that the owner can no longer rely on easily cracked passwords, each control home appliances need only to scan their fingerprints.

To sum up

At this stage, although some software has been applied to the fingerprint identification technology (such as Paypal, QQ, etc.), but small series that fingerprint to gimmick meaning greater than the actual practical significance, fingerprint recognition and popularity of the application is a relatively long The process must be in all areas (fingerprint recognition hardware developers, application developers) can complement each other perfectly. Xiao Bian quite looking forward to fingerprint can bring more real experience, not just unlock the phone.

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