High-speed and High-accuracy Position Sensor for 3-D Measurement Using Row Parallel Processing on the Sensor Plane
Details
In the 3-D measurement system using light projection, the sensor detects the position of the projected light on the sensor plane. The 3-D measurement system using sheet light projection can decrease frames per range map, but then the system has lower accuracy than that using spot light projection when the positions are calculated from a binary image. In this paper, we present a method of high-speed and high-accuracy position detection using row parallel processing for real-time 3-D measurement. The row parallel position detection on the sensor plane can realize high frame rate and acquire the contrast of the projected light due to searching repeatedly in one frame. By the simulation results using 0.6μm CMOS process, the frame time to acquire the position of the projected sheet light is about 17.8 μs and the sub-pixel accuracy is less than 0.1 pixel when the sensor has 256×256 pixels.
