用numpy/torch将圆环映射成矩形

话不多说，先上图：

img = cv2.imread('yz.jpeg',cv2.IMREAD_COLOR)
imgRGB = cv2.cvtColor(img,cv2.COLOR_BGR2RGB)
dst = cv2.resize(imgRGB, (400, 400))

Image.fromarray(circle2rectangle(dst,(200,200),200,100))

方法代码：

def circle2rectangle(img,circle_center,R,W):
    C=int(2*R*np.pi)
    rectangle = np.