05/04/2020
Structured light cameras are widely used in many occasions. You can find it everywhere in our daily life. When you go to a store, you will see a face-recognition cash register. Also when you step into a supermarket like Jack Ma's Hema, you can easily find the cameras are equipped in the payment machines. Others like McDonald's , KFC and some fast-food restaurants also adopt 3D face-recognition payment solutions. Usually the payment process will be done within 3 seconds, it helps largely increase the efficiency and convenience of people's daily payments.
Why are structured light cameras so effective?
A structured light camera includes five main parts:
1. A dot projector which emits over 30,000 infrared rays to your face;
2. An IR camera bonded with infrared sensor chip, it captures the infrared dot matrix ,and build an infrared image and transmits the data to the main chip.
3. A flood illuminator that strengthen the invisable infrared light in dark enviroment.
4. An RGB camera that capture a 2D color image.
5. An image process chip. To synthesize the 2D color image and 3D infrared model under the algorithm and output the final 3D model.
The sensing of structured light is fast. We can divide it into 4 steps:
1. RGB camera capture an RGB image.
2. The projector emits over 30,000 infrared rays encoded with array parameters, and the flood illuminator lights up the face. So that there come deformed light spots on the face.
3. The IR camera capture and trace the deformation of each infrared light spot, and comparing with the original array parameters. Through computation of algorithm, it acquires the depth information on the face.
4. By comparing the 2D and infrared 3D model, the image process chip will synthesize the data and output the 3D model.
The main chip on the board will recogize human faces by comparing with the information in database. The whole process will be finished in seconds.
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