Research About The 3-D Vision System Of The LED Production Equipment

LED(Light Emitting Diode), it’s a semiconductor component that can transform electric energy into light. LED has the advantages of high efficiency, low power consumption, small volume, long service life, no pollution, and convenient assembly, LED is known as the fourth generation light source. Many precision electronic equipments have been used in the production of the LED products. Based on the analyzing on the LED Mix powder machine and the LED THT machine, two similar requirements for both machines were found.(1) Both the LED Mix powder machine and the LED THT machine need to build a 3-d vision system to assist the system control. Such as in the LED mix powder machine system, need to move the dropper close to the edge of the cube, and in the THT machine system, need the LED to be pre-detection and to be put through the hole correctly. all the above operations need to capture the 3-d information to assist the control of the robot arm.(2) As Traditional LED Mix powder machine and LED THT machine need to use two industry-camera to build the stereo system, the equipmentis expensive and have low real-time performance. to develop a low cost and strong real-time performance embedded system to implement the 3-d vision system is in demand.As the above two demands, a set of binocular vision hardware platform for precise electronic equipment is designed, the platform use dual-core DSP as control core, to implement the cost control. A binocular vision system to realize the three-dimensional information acquisition was built. As the system is a dual-core system, it’s real-time performance is superior. Through the design of the binocular vision hardware platform for precise electronic equipment. the application of binocular vision system using in precision electronic equipment was researched. In this paper, the research mainly focused on the following aspects:(1) According to the demand of the system, the hardware system was designed and the mainly hardware-chip was selected. including the selection of processor and sensor, the hardware design of power supply module and the Ethernet module of the DSP main board, and the design of the camera module.(2) the software frame based on ucos-ii embedded operating system is set up, the task scheduling of the system was analyzed. To exploit the advantage of the ADSP-BF609, the dual-core DSP chip, to full, the Multi-core Communications API(MCPAI) and the design method of the parallel algorithm is researched, Basing on the research, the parallel algorithm of the Fast Fourier Transformation(FFT) was realized, and through the experiment of the algorithm, the brilliant performance of the dual-core was proved.(3) As the binocular calibration and the binocular rectification play an important role in binocular vision system, the binocular calibration and the binocular rectification was realized on the 3-d vision hardware platform that was designed in this paper.(4) The stereo match algorithm was studied, A method of under polar constraints based on canny edge feature and region growing match stereo match algorithm was proposed. The algorithm realize the stereo match on the stereo image of the Mix powder Dropper, and get the disparity map.