The iris is a ring of tissue between the white sclera and the black pupil of the human eye and contains the most abundant texture information. In terms of appearance, the iris is composed of many glands, folds, pigment spots, etc. It is one of the most unique structures in the human body.
The iris has many inherent advantages as an identity:
1) Uniqueness. Because there are many randomly distributed details of the iris image, the uniqueness of the iris pattern is created. The iris phase feature proposed by Prof. John Daugman of the University of Cambridge in the United Kingdom confirmed that the iris image has 244 independent degrees of freedom, that is, the average amount of information per square millimeter is 3.2 bits. In fact, using pattern recognition method to extract image features is a lossy compression process, which can predict the information capacity of iris texture much larger than this. The iris details are mainly determined by the random factors of the embryonic development environment. There are significant differences between the iris images of the right and left eyes of cloned humans, twins, and the same person. The uniqueness of the iris lays the foundation for high-precision identification. The test results of the National Physical Laboratory in the UK show that iris recognition is the lowest error rate among various biometric identification methods.
2) Stability: The iris develops from the 3rd month of the embryonic stage of the baby, and the main texture of the iris has been formed by the 8th month. Unless it is subjected to eye-threatening surgery, it will remain unchanged for the rest of the life. Due to the protection of the cornea, the fully developed iris is not easily harmed by the outside world.
3) Non-contact, the iris is an externally visible internal organ. You do not need to closely follow the acquisition device to obtain a qualified iris image. The recognition method is more clean and hygienic than the fingerprint, hand shape, etc. The device affects other people's identification.
4) Facilitate signal processing. The pupil and sclera are in the area of ​​the eye image and adjacent to the iris. There are significant grayscale changes in the iris and the iris region. The boundaries of the region are close to circular, so the iris region is easy to fit and split. One. The iris structure facilitates the realization of a mode expression with translation, scaling and rotation invariance.
5) Anti-counterfeiting is good, the radius of the iris is small, the Chinese iris image is dark brown under visible light, and no texture information is visible. The acquisition of an image with a clear iris texture requires a dedicated iris image acquisition device and the user's cooperation. It is difficult to steal other people's iris images under normal circumstances. In addition, the eye has many optical and physiological properties that can be used for living body iris detection.
Iris recognition determines the identity of people by comparing the similarities between the features of the iris images. The core of the iris recognition is the use of pattern recognition, image processing, and other methods to describe and match the iris features of human eyes so as to achieve automatic personal identity authentication.
The process of iris recognition technology is generally divided into four steps: iris image acquisition, image preprocessing, feature extraction, and feature matching.
In all biometric technologies including fingerprints, iris recognition is the most accurate one currently used. Iris recognition technology has been rapidly developed with its advantages of high accuracy, non-contact acquisition, and ease of use. It is widely considered to be the most promising biometric authentication technology in the 21st century. Future security, defense, and e-commerce are many. The application of this field will inevitably focus on iris recognition technology. This trend has gradually begun to appear in various applications around the world, and the market has a very broad application prospect.
The iris has many inherent advantages as an identity:
1) Uniqueness. Because there are many randomly distributed details of the iris image, the uniqueness of the iris pattern is created. The iris phase feature proposed by Prof. John Daugman of the University of Cambridge in the United Kingdom confirmed that the iris image has 244 independent degrees of freedom, that is, the average amount of information per square millimeter is 3.2 bits. In fact, using pattern recognition method to extract image features is a lossy compression process, which can predict the information capacity of iris texture much larger than this. The iris details are mainly determined by the random factors of the embryonic development environment. There are significant differences between the iris images of the right and left eyes of cloned humans, twins, and the same person. The uniqueness of the iris lays the foundation for high-precision identification. The test results of the National Physical Laboratory in the UK show that iris recognition is the lowest error rate among various biometric identification methods.
2) Stability: The iris develops from the 3rd month of the embryonic stage of the baby, and the main texture of the iris has been formed by the 8th month. Unless it is subjected to eye-threatening surgery, it will remain unchanged for the rest of the life. Due to the protection of the cornea, the fully developed iris is not easily harmed by the outside world.
3) Non-contact, the iris is an externally visible internal organ. You do not need to closely follow the acquisition device to obtain a qualified iris image. The recognition method is more clean and hygienic than the fingerprint, hand shape, etc. The device affects other people's identification.
4) Facilitate signal processing. The pupil and sclera are in the area of ​​the eye image and adjacent to the iris. There are significant grayscale changes in the iris and the iris region. The boundaries of the region are close to circular, so the iris region is easy to fit and split. One. The iris structure facilitates the realization of a mode expression with translation, scaling and rotation invariance.
5) Anti-counterfeiting is good, the radius of the iris is small, the Chinese iris image is dark brown under visible light, and no texture information is visible. The acquisition of an image with a clear iris texture requires a dedicated iris image acquisition device and the user's cooperation. It is difficult to steal other people's iris images under normal circumstances. In addition, the eye has many optical and physiological properties that can be used for living body iris detection.
Iris recognition determines the identity of people by comparing the similarities between the features of the iris images. The core of the iris recognition is the use of pattern recognition, image processing, and other methods to describe and match the iris features of human eyes so as to achieve automatic personal identity authentication.
The process of iris recognition technology is generally divided into four steps: iris image acquisition, image preprocessing, feature extraction, and feature matching.
In all biometric technologies including fingerprints, iris recognition is the most accurate one currently used. Iris recognition technology has been rapidly developed with its advantages of high accuracy, non-contact acquisition, and ease of use. It is widely considered to be the most promising biometric authentication technology in the 21st century. Future security, defense, and e-commerce are many. The application of this field will inevitably focus on iris recognition technology. This trend has gradually begun to appear in various applications around the world, and the market has a very broad application prospect.
PDC cutters for geology and mining series have high abrasion resistance and impact resistance through adopting advanced international technology. Meanwhile we have improved the structure of interface combination between polycrystalline diamond layer and tungsten carbide substrate which can improve the distribution of stress and make the interface firm and steady. So this series of production are reliable, durable for years while high cost -effective
Geological Exploration,High-End Pdc Cutter,Pdc Cutters For Minining,High Abrasion Resistance Pdc Cutter
HENAN YALONG DIAMOND TOOLS CO.,LTD , https://www.pdcpcbncutter.com