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Intelligent Identification Filter
We are an optical bandpass filter manufacturer in China. Our optical filter is one of the precision photoelectric thin film components. Its main principle is to realize the high transmission or high reflection effect of a specific band light source through special optical design and help terminal products complete the extraction, screening, and transformation of biological information and the acquisition of 3D depth of field information. If you are interested in our products, Welcome to contact us.
As the current mainstream 3D vision technology, TOF and structured light have different principles, but their core components are basically the same. A biometric filter (also known as a "narrow-band filter") is an important part of them. In addition, for binocular infrared stereo imaging technology, iris recognition, vein recognition, and other biometric technologies, the biometric filter is also an essential key component.
The biometric filter is one of the precision photoelectric thin film components. Its main principle is to realize the high transmission or high reflection effect of a specific band light source through special optical design and help terminal products complete the extraction, screening, and transformation of biological information and the acquisition of 3D depth of field information.
Biometric filter definition
To obtain the position and depth of field information of objects, electronic devices need to use infrared light of a specific wavelength as the sensing medium. Therefore, it is necessary to remove the infrared ray of the interference frequency band contained in the sunlight and retain the infrared light of a specific frequency band (such as 940nm) that is relatively weak in the surface sunlight. The use of a biometric filter can allow the infrared light of the above specific frequency band to pass through, so it is also called a narrow-band filter.
The biometric filter is one of the precision photoelectric thin film components. Its main principle is to realize the high transmission or high reflection effect of a specific band light source through special optical design and help terminal products complete the extraction, screening, and transformation of biological information and the acquisition of 3D depth of field information.
Biometric filter function
Different from biometric filters, infrared cut-off filters are optical films with high and low refractive index alternately plated on optical substrates such as white glass, blue glass, or resin sheet by using precision optical coating technology. Infrared cut-off filters can realize optical filters with high transmittance in the visible light region (400-630nm) and cut-off in the near-infrared light region (700-1100nm), and eliminate the impact of infrared light on imaging by realizing the cut-off in the near-infrared light region.
In contrast to the transmission frequency band of the infrared cut-off filter, the biometric filter only allows the infrared light of a specific frequency band (e.g. 940nm) and realizes the high transmission or high reflection effect of the light source of a specific frequency band through special optical design. The biometric filter allows smartphones, AR/VR devices, etc. to obtain the 3D depth of field information carried by the infrared light of a specific frequency band and helps electronic products complete the extraction of biological information Screening and transformation, as well as the acquisition of 3D depth of field information, to achieve 3D face recognition, iris recognition, gesture recognition, and other biometric functions.
