图像修复： 通过先验知识，找到被绿色点污损的区域，以此建立起无损区域蒙版，从区域外层逐步向内层修复被损的像素点，当污损点在非平滑区域的时候，选择出原图纸最佳的颜色过渡路径，用此路径上的值进行填充。-Image restoration: By prior knowledge was found defaced Green Point area, in order to establish non-destructive regional masks, gradually repair t