ELM做的文字识别，有文字库，识别精度非常高-handwriting cognification by Extreme Learning Machine

案例26 粒子群算法的寻优算法-非线性函数极值寻优-26 cases of particle swarm algorithm optimization extreme- nonlinear function optimization algorithm

尺度不变特征转换算法（sift）在空间尺度中寻找极值点，具有位置、尺度、旋转不变性，可正常运行-Scale Invariant Feature Transform algorithm (sift) looking at the spatial scale of the extreme points, with the position, scale and rotation invariance, the normal operation