Design And Implementation Of High Accuracy Phase TOF Camera Master Chip

With the development of computer frontier technology,three-dimensional imaging technology has been widely applied,such as artificial intelligence,driverless,virtual reality and cultural relics protection.With the increases of these application scenarios' s complexity,the requirements for depth cameras are also increasing.Mainly include: lower imaging cost,faster imaging speed,and higher imaging accuracy.However,traditional 3D imaging technology does not meet the current needs,so it is of essential to study high-cost,high frame rate and high-precision 3D imaging technology.This paper designs a TOF camera master chip based on ZYNQ platform.provides a solution for designing low-cost,high-performance TOF camera imaging system.In this paper,the principle of the imaging system of TOF camera and the error and its error correction method in the imaging process are studied.The depth calculation circuit is designed according to the imaging principle of TOF camera,and the error correction circuit is designed according to the error correction algorithm.The error correction circuit can correct the errors such as errors caused by ambient light,nonlinear offset errors,and errors caused by temperature offsets.In order to increase the speed of operation,optimize the on-chip caching scheme and the DDR storage scheme.Aiming at the requirement of higher imaging accuracy,an efficient error correction scheme is proposed.In order to make the user more intuitive to see the effect of the imaging system of the TOF camera,the data collected by the module is used to update the original data in the system in real time,and the data is transmitted to the video display end by using the HDMI interface.This topic uses the ZYNQ 7020 development board as the development platform,and the TOF camera module used is the EPC660.The camera module integrates an infrared transmitter,a TCMI transmission interface,an I2 C slave interface,an EEPROM.and requires few peripheral devices to build a full-featured TOF ranging system.The camera resolution is 320×240.The main control chip of the designed TOF camera is tested and analyzed.The TOF camera master chip designed in this paper is connected with it to form a TOF camera ranging system.The experimental results show that the TOF camera master chip designed in this paper can drive the TOF module to work normally,and output depth data in real time.The system's running frame rate reach 27 frames,and the measurement accuracy reach mm level.Compared with the software-implemented TOF camera imaging system,this imaging system designed in this paper has a higher operating frame rate.Compared with the TOF camera imaging system implemented by pure hardware ASIC,this imaging system designed in this paper has higher flexibility.