In the past two years, with the development of technology, 3D face recognition technology has gradually matured. Face recognition technology provides a non-contact unlocking and authentication method with a stronger sense of technology and wide applicability, and more and more enterprises begin to adopt it. Smart door lock products with face recognition as the main recognition technology. While face recognition technology brings application convenience to door locks, it also puts forward new requirements for power consumption processing. How to achieve low power consumption processing is a problem that engineers need to solve. ToF Sensor can well assist in face recognition. Low-power processing. Next, I will introduce how ToF Sensor is suitable for smart door lock applications with face recognition.
What is ToF Sensor and what are the key parameters?
ToF stands for Time of flight. Time-of-flight technology, as the name suggests, is a technology that measures the time that light travels in the air to sense distance. It is expressed by a simple formula:
The measurement principles of ToF Sensors are the same, but the light sources used by different Sensor manufacturers are different, and the detection angle and distance are also inconsistent. Common parameters to be considered include the detection distance (Operating Range),sample Rate, Field of view,Power Consumption, understanding these parameters can basically help you choose a ToF Sensor.
How do face recognition and ToF Sensor combine?
Face recognition smart door locks are usually equipped with ToF Sensor in order to meet the needs of long-term use. The application of ToF Sensor here is mainly reflected in two aspects, one is to do human body detection, and the other is to do pre-awakening of the face recognition system. In the face recognition door lock, due to the large power consumption of the face recognition module, the dynamic power consumption current can reach hundreds of mA. The general processing is to directly power down when not in use, saving power consumption. To wake up the module through an external interrupt, you can consider using the ToF Sensor at this time. The ToF Sensor has low power consumption and can save system power consumption.
