对飞机进行边缘检测，阈值分割。从而达到图像感兴趣区域提取的目的，能使得图像中的飞机以黑白形式清晰地单独显示出来-Aircraft edge detection , thresholding . So as to achieve the purpose of extracting image regions of interest , can make the image appear as black and white aircraft clearly separate