Accurate Real-Time Implementation of Dynamic Light Spot Center Extraction Based on FPGA

High speed and accurate extraction of light spot center coordinate is very important for an optical detection system. A center-extracted method based on FPGA by combining the Kalman filter with the Hessian matrix is proposed for the implementation of real-time light spot processing. The proposed method reduces the searching area and the number of Gaussian convolutions greatly, and improves the speed of extraction. The experiment shows that it is a more efficient method than before, using less logic resources but enhancing the processing speed greatly, and the accuracy of results can reach the magnitude of sub-pixel. The RMS error of light spot center is 0.3 pixels, and the processing time for a 1024×512 image is 1.21 ms.