With currently existing spot centroiding algorithm

image with discrete noise pixel cannot be processed directly. In this paper

a new centroiding algorithm and its FPGA implementation that is immune to noise pixel is proposed. This algorithm does not depend on noise pre-process or post-process to eliminate noise pixel. Background pixel

noise pixel and spot pixel is marked differently. Each pixel is marked after it is compared with neighbouring pixel. At the same time

centroid parameters that is belong to same spot is accumulated

while noise pixel is bypassed. Compared with currently existing algorithm

this method takes full advantage of the parallel processing ability of FPGA. Centroid coordinates extracting and noise pixel eliminating runs simultaneously with picture output. The extra memory for picture pre-process is not needed and storage space is saved. This algorithm provides an effective way to process high-brightness image with discreet noise spot that is caused by long exposure time.