Design And Implementation Of High Precision TOF 3D Depth Camera

In recent years,with the rapid development of digital imaging technology and microelectronic technology,3D imaging system based on TOF technology is greatly paid attention by the academic and industrial circles,and has become one of the most important topic in the field of depth acquisition.Compared with other depth acquisition methods,TOF technology has the advantages of simple principle,strong anti-jamming ability,high imaging accuracy,good portability and easy integration.It has been widely used in human-computer interaction,robot navigation,virtual reality and other fields.In this paper,the engineering realization technology of TOF camera is studied and explored.The main research work is as follows:(1)The hardware design of TOF 3D depth imaging system has been completed.The programmable multi-channel power management circuit is designed,which successfully solves the complicated power supply problem of the system.The power control circuit of the camera is designed,which solves the power allocation problem of the camera in different applications and reduces the power consumption of the camera.The high frequency and large current laser driving circuit is designed to ensure the stable output of high frequency modulated pulse.The phase offset calibration circuit is designed,including temperature calibration circuit and path delay calibration circuit,which improves the measurement accuracy of TOF camera.ESD,undervoltage,overvoltage,current limiting protection circuit and power monitoring circuit are designed to improve the stability and reliability of TOF camera.The main circuit of TOF camera is designed,including TOF sensor circuit,TFC controller circuit,DDR2 memory and related configuration circuit.Optical design of the TOF camera is optimized,and a laser diffusing diffuser is added to the optical path to reduce the fluctuation of the light intensity,which avoids the influence of the laser speckle on the imaging quality and improves the measurement accuracy of the TOF camera.(2)The communication architecture and firmware design of TOF camera has been completed.The camera communication architecture is designed with the USB2.0 controller as the core,which includes the 9-slave IIC communication circuit and the Slave FIFO asynchronous communication circuit,it solves the problem of real-time configuration of each chip and real-time transmission of depeh data.Firmware of TFC controller and USB2.0 controller are also designed to ensure the normal operation of the camera.(3)A TOF 3D depth imaging system is built.After hardware testing,all the circuits of the camera can work effectively and the waveforms of the key signals are normal.At the same time,the imaging performance of TOF camera is tested in a variety of complex scenes.The experimental results show that the imaging accuracy,frame rate,measurement distance and other related parameters of TOF camera can meet the expected design requirements.