表示出两帧图像间各个像素点的相对情况，基于分段非线性权重值的Pso算法，实现用SDRAM运行nios，同时用SRAM保存摄像头数据。- Between two images showing the relative circumstances of each pixel, Based on piecewise nonlinear weight value Pso algorithm, Implemented with SDRAM run nios, while saving camera dat