中文说明：提取归一化中心矩——对平移和放缩有良好的不变性，我感觉比HU矩要简单可靠，请各位指正。qq254730570
English Description：
Extraction of normalized central moment -- it has good invariance to translation and zooming. I feel that it is simpler and more reliable than Hu moment. Please correct me. qq254730570