What is iris detection?

As we all know, the structure of the human eye is composed of sclera, iris, pupil lens, retina and other parts. The iris is one of the most important parts of the human eye. It not only allows the human body to see light, but also can be used for human identity recognition. Therefore, based on its principle, researchers have developed iris detection technology for medical research, which is mainly used to detect and identify the human iris, and then use medical principles to diagnose and treat people with eye diseases.

How to do iris detection

1. Image acquisition: Use specific digital camera equipment to capture the entire eye of a person, and transfer the captured image to a computer for storage through an image acquisition card.

2. Image preprocessing Since the captured eye images contain a lot of redundant information and cannot meet the requirements in terms of clarity, they need to be preprocessed including image smoothing, edge detection, image separation and other operations.

3. Feature extraction: Unique feature points are extracted from the separated iris image through a certain algorithm and encoded.

4. Feature matching compares and verifies the feature code with the iris image feature code stored in the database in advance, so as to achieve the purpose of recognition.

Pros and Cons of Iris Detection

Advantages: No direct contact is required; cannot be copied and is unique; the equipment requires no maintenance and is highly efficient; the recognition speed is fast.

Disadvantages: high cost and difficult to promote; the lens has a high probability of producing image distortion, resulting in reduced sampling reliability; requires a combination of software and hardware; needs to be within a specified distance.

The development of iris detectors

1. Purely optical instruments

As the earliest iris detection instrument, it initially used an ordinary magnifying glass and required external ambient light as the light source. Therefore, insufficient ambient light had a great impact on the detection and also placed high demands on the iris technician. With the popularization of the application, professional iris instruments have emerged. They still use purely optical magnifying glasses, but are equipped with detection lights so that iridologists can observe the iris clearly.

2. Optical + electronic instruments With the development of electronic technology, the original optical instruments have been combined with electronic technology to develop into the second-generation iris meter. The iris meter lens is composed of optical components, and electronic components complete the signal collection/conversion and even temporary storage functions, which are then displayed through a display instrument.

3. Optics + Electronics + Computer Technology

The emergence of computers has greatly promoted the development of society and brought iris scanners into the era of intelligence, allowing more people to easily master the application of iris diagnosis. No professional training required: computer automatic diagnosis and analysis (iris wizard), no need to memorize iris spectrum; can store customer files, test data, and print diagnosis reports; uses USB interface to connect to computer, no external power supply required, can be used with laptop in various environments