In daily life, what we call iris refers to the muscles outside the eye that adjust the size of the pupil and control the amount of light entering the eye. It is the colored part of the eye based on the amount of melatonin.
Iris coding is an iris recognition technology. Iris recognition technology is to confirm the identity by photographing the iris of human eyes. It is a biometric-based identity authentication technology, also known as biosafety technology.
The earliest theory of iris recognition began in the early years, but the technology was not applied to commercialization until after1990s. Dr. JohnDargman of Cambridge University has become the pioneer of iris recognition in the industry and the first person to really put iris recognition technology into practice from theory.
The role of iris:
Iris is an externally visible internal organ, and qualified iris images can be obtained without relying on acquisition equipment. This recognition method is cleaner and healthier than fingerprints, hand shapes and other biological features that need contact perception, and it will not reduce the performance of imaging equipment or affect the recognition of others.
In the eye image, the areas adjacent to iris are pupil and sclera. There are obvious gray changes between them and iris region, and the two boundaries of the region are close to circular, so iris region is easy to fit, segment and normalize. Iris structure is beneficial to the pattern representation with translation, scaling and rotation invariance.