Research Of Vision Measurement System Based On Embedded Technology

Nowadays, the theory research of the vision measurement focuses on the pc vision system. But in the actual application, the embedded system tends to take place of the pc vision system. Because of the variety of the hard platform, there is little mature embedded vision measurement arithmetic and because of the cross development environment, it increases the difficulties to develop a mature vision measurement system.On the condition of the specific lighting, a vision measurement of circular accessories with the precision of sub-pixel is realized on the DM642 DSP hard platform. The main research is described as follow:(1) The basic structure of the embedded vision measurement system is analyzed and one embedded vision system to measure a circular accessory in real time is selected.(2) Comparing with several common arithmetic of edge detection, a sobel operator is selected to get the general location of the circle edge. By analyzing the two common methods of sub-pixel location, the cubic fit is adopted to increase the measurement precision of the edge point of circle. The diameter of circle and the position of the center is fixed by the circle fit through searching eight edge point ofcircle.(3) Under the same environment, the vision measurement arithmetic proposed is validated by using the ppt embedded vision platform of high performance to get the image and matlab to imitate. The imitation result proves the proposed arithmetic in this paper meets the requirement of sub-pixel precision.(4) The vision measurement of the circular accessory is realized under the embedded DSP platform. The vision measurement arithmetic of DSP is optimized to make sure the whole processing speed of the vision measurement arithmetic meet the time requirement of industry measurement.(5) The encryption is used to the whole vision measurement system to protect the copyright of the system effectively by the combination of the hardware and software.Undcr the testing in the lab, the circular accessory can bc real-time measured by the embedded vision measurement system of this paper and it also can meet the requirement of the industry measurement on the precision and speed. This system makes a good foundation on the futurc vision product and has the wide application foreground and market value.