WCSE

Multi-point Projection Phase TOF Ranging Syst

Abstract— TOF (Time of Flight) depth detection equipment is widely used in robotics, mobile phones, and medical fields. At present, flood light emission is the mainstream phase TOF light source emission scheme because of its relatively simple design and mature algorithm. However, in some application scenarios that do not require high resolution, the energy utilization rate of the light source part of the flood-type TOF system is low, which leads to a reduction in the measurement distance, and the dense optical path will aggravate the multi-path effect. For such scenarios, this paper proposes a multi-point projection scheme suitable for phase TOF. Compared with the floodlight scheme, this scheme has the following improvements: First, by adding a special optical diffraction device to the light source part of the module, the projected light spot can be distributed according to a specific light intensity, increasing the local light spot intensity and improving the energy utilization rate of the light source; The second is to propose an effective pixel selection scheme suitable for multi-point projection TOF to reduce depth map noise; The third is to provide a depth error correction method suitable for multi-point projection TOF, so that the accuracy can reach the millimeter level. Compared with the flood-phase TOF ranging solution with the same power consumption and volume, this solution can increase the ranging range by 2 times when the accuracy is the same; at the same distance, the power consumption is reduced by 3 times.

Index Terms—time of flight, multi-point projection, phase TOF, photoelectric measurement

Xu Yuan, Lv Kang
Shenzhen Technology University, CHINA

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Cite:Xu Yuan, Lv Kang, "Multi-point Projection Phase TOF Ranging System, " Proceedings of 2022 the 12th International Workshop on Computer Science and Engineering (WCSE 2022), pp. 365-372, June 24-27, 2022.