How to choose the ideal 3D depth camera

Mar 19, 2022

Application of 3D depth camera has become more common around us. In industrial scenarios, such as grabbing and unloading, welding, grinding and cutting in automated factories, product testing in the production process, and depalletizing and other applications. On the consumer side, face recognition access control installed in high-speed rail stations,residential schools etc, dental model scanning, and 3D reconstruction before and after facial beauty in the medical beauty industry. It can be seen that the selection of 3D depth camera occupies an important position in the development and deployment of visual projects.
How to better choose a suitable 3D depth camera , first of all, we need to know what are the main principles of 3D cameras, what are the advantages and disadvantages of different working principles, and what are the main features and important parameters of 3D cameras from different manufacturers. Only by having an in-depth understanding of these contents can we select a suitable 3D depth camera for the project and accelerate the implementation of the project.
3D depth camera working distance and depth of field
Working distance refers to the distance between the closest end of the 3D depth camera and the farthest distance from the surface of the object to be measured, and the depth of field refers to the difference between the working distance of the closest end and the farthest end;
For the selection of depth of field, take ordinary deep frame grabbing as an example, define the size of the material frame as length and width = 500mm*500mm*1000mm, and the point cloud in the W and H directions needs to cover 700mm*500mm, we need to select the model. Determine the working distance of the camera when it can meet this field of view. At the same time, adding the height of the material frame under this distance is the actual height of the camera, and the height of the material frame is the depth of field we need when selecting a camera. In the selection of large depth of field cameras, 3D depth camera with MEMS galvanometers as the projection core components have the characteristics of large depth of field, with a maximum depth of field of 2 meters, which can meet application scenarios such as large-scale depalletizing.

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