matlab图像处理求取叶片面积，包含去噪，二值化，连通域标记，去除小面积- MATLAB image processing to obtain blade area, including denoising, two value, connected domain labeling, removal of small area

包括面积、周长、矩形度、伸长度，用平面波展开法计算二维声子晶体带隙,在MATLAB中求图像纹理特征。- Including the area, perimeter, rectangular, elongation, Computation Method D phononic bandgap plane wave, In the MATLAB image texture feature.