A TDI CCD based method for light target location in large field of view

In this paper, the method of two TDI (Time Delay Integration) CCD intersection is proposed to achieve the location of light target in a large field. Frame difference method combined with OTSU threshold segmentation algorithm is proposed to identify the image with light target. Besides, in order to reduce the storage capacity, we carry out binarization processing on target image. For getting the position of the light target in target image, the grayscale centroid algorithm is presented. In this paper, TDI CCD with high-speed and high-sensitivity is utilized as image sensor, and MATLAB is selected as image processing software. In our test, we carry on image processing by using the above algorithm with the images of 8192*32 pixels acquired from the 320m*240m field by two TDI CCD cameras in MATLAB. With the method of intersection of two TDI CCD, the location error is within 5% compared with the result achieved by total station instrument.