ToF camera is an imaging technology that emits continuous infrared light pulses of a specific wavelength to the target, receives the light signal returned by the object to be measured through a specific sensor, and calculates the flight time or phase difference of the light round-trip to obtain the 3D depth information of the object to be measured. Brightness images from ToF cameras can be quickly connected through the model.
From a technical point of view, the performance challenges faced by ToF technology in consumer electronics (virtual reality, face recognition, somatosensory interaction) and other applications are usually less difficult, and the focus is mainly on low cost, low power consumption and small size. In other respects, the requirements for measurement speed, life and resolution are not strong. But for automobile (assisted driving, face recognition, gesture recognition), industrial automation (automatic obstacle avoidance, measurement ranging, perception positioning), medical electronics (augmented reality, remote interaction), new retail (gesture recognition, passenger flow statistics, For professional-level scenarios such as behavior recognition), intelligent security (face recognition, behavior analysis), the design of the ToF sensing system not only needs to strike a balance between accuracy, range, response time, resolution, cost, power consumption, and packaging , it is also necessary to customize the design for various uncontrollable factors in different situations, the flexibility and anti-interference of the sensing system, such as adding some high-reliability filtering and anti-interference devices/modules, and loading Relevant software algorithms to ensure that the system has sufficient capacity to deal with different types of emergencies.
Taking automobile applications as an example, if ToF camera technology is used, the reversing system can detect multiple pedestrians or obstacles at different distances at the same time. After being processed by the software, it can also warn the distance with images or sounds to help drivers understand the relevant road conditions behind the car.
In the field of intelligent buildings, taking the ToF 3D automatic door solution with face recognition as an example, the traditional automatic door adopts the principle of infrared reflection, which can only detect whether there is an object in the sensing range, so that animals can also freely enter and exit the mall, causing management troubles. ToF-based solution can identify the human characteristics in the space and the relative position distance between the person and the object, and accurately distinguish the height, weight, entry and exit time and other related information of the entry and exit at the lowest cost.
In addition to fully acquiring the depth information of objects, ToF camera technology can also bring visual effects to robots in the industrial field, making them have the same sense of direction as humans. However, if lidar is used to solve the problem of autonomous obstacle avoidance of robots, the cost needs to increase a lot; the dual-camera solution requires a lot of calculations and the adjustment of the precise position of the dual-camera. So ToF camera may be the best solution, welcome to consult.
