Fingerprint sensor (also known as fingerprint sensor) is the key device for fingerprint automatic acquisition. Fingerprint sensor by sensing principle, that is, fingerprint imaging theory and technology, is divided into optical fingerprint sensor, semiconductor capacitive sensor, semiconductor thermal sensor, semiconductor pressure sensor, ultrasonic sensor and RF RF sensor. Fingerprint sensor manufacturing technology is a comprehensive, high technical complexity, manufacturing technology difficult high-tech.
Semiconductor fingerprint sensor because of its complex manufacturing processes, sensing unit per unit area, including high-end IC design technology, large scale integrated circuit manufacturing technology, IC chip packaging technology, so the semiconductor fingerprint sensor is almost all developed by the IC technology countries or Regions, such as the United States, Europe, Taiwan and other places designed and manufactured. A less than 0.5 square centimeter of the chip surface integrates more than 10,000 semiconductor sensing unit. Internal also includes an automatic gain circuit and logic control chip, as well as serial, parallel, USB and other interface circuits. The current semiconductor fingerprint sensor sensitivity, resolution has reached 500dpi or more. Its function has exceeded a single sensing capability, coupled with the software, can be used as omnidirectional navigator.
Although fingerprinting technology has matured, image processing and pattern recognition technology have been well solved, but in fact, as the core technology of fingerprinting there are still many unsolved problems, especially the incomplete, dirty fingerprinting identification Is not satisfactory in terms of robustness and adaptability. Fingerprint identification systems will further broaden their use with the advent of smaller and cheaper fingerprint input devices, more computationally powerful and less expensive hardware, and the widespread use of the Internet, where , The application algorithm that can adapt to the online online fingerprint automatic identification system needs to be further improved, and the integrated application of multiple fingerprint identification methods and the integrated application including the identification of multiple biometrics including fingerprints will also be the direction of future research and development. In recent years, Research on foreign fingerprinting has another trend of warming, so the next few years is still an important and challenging topic of pattern recognition research.
Geppy Parziale, a biometric certification specialist at InvasiveCode Inc., posted on the site an in-depth explanation of fingerprinting and explains why fingerprinting is a proven authentication solution. Fingerprint recognition technology is the most important sensor. Recognition of the quality of the most dependent on the sensor to capture the quality of the fingerprint image, the less noise, the higher the quality. The core technology of the production sensor can make the captured fingerprint photos have noise and errors, which can affect the recognition effect. In this case, the correct fingerprint may not be identified or the wrong fingerprint is identified, and both cases are very serious.
Parziale also shared his concerns about the sensor, especially the issue of life. In everyday life, the situation is very complicated, users often use the hand to complete various tasks, access to different items. The material above these things will accumulate in the skin of the fingers, when you touch the fingerprint sensor, these substances will be attached to the sensor. In addition, sweat and oils from the skin can affect the sensor.
Various substances, sweat and grease will reduce the life of the sensor. We also need to consider that users will place the iPhone in a variety of places, such as "dirty" pockets, on different surfaces, in humid, overheated, undercooled or overdried environments. These factors will accelerate the decay process of the sensor. Of course, the sensor's performance may vary depending on how well Apple specializes in hardware.
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