Improved Harris algorithm within scale-invariance

Based on the SIFT recognition method, this solution is to obtain the natural features in computer vision recognition and matching by means of the Gauss pyramid, DOG pyramid, their differential functions appoximated instead of σ²▽²G to achieve the scale invariance practice. Through the Harris corner detection algorithm for the corresponding transformation formula, and the Gauss pyramids, DOG pyramid, the modified algorithm obtain a certain degree of scale invariance. This improved algorithm can be used either to supplement characteristics of the SIFT algorithm, and can also be used as a separately kind of scale invariance of the feature recognition algorithm.