2-D image correlation tracking is a key factor for the 1m optical system on SST (Space Solar Telescope) to reach its 0.1″spatial resolution.The image correlation algorithm's FPGA implementation methods are introduced:2×2 radix butterfly-algorithm
modular structure
two levels infinite state machine
dynamic block float-point
and parallel processing sequence.Only 713us is needed to realize a 32×32 image correlation algorithm on XCV800 FPGA chip with 20MHz clock.Tracking precision is better than 1/50 pixel.