1、画直线
line(img: ndarray,
pt1: Sequence[int],#起点
pt2: Sequence[int],#终点
color: Sequence[float],#颜色
thickness: int = ...,#宽度
lineType: int = ...,# 线形
shift: int = ...)# 缩放比
2、画矩形
cv2.rectangle(img,(150,150),(300,300),(0,0,255),5,8)
cv2.line(img,(150,150),(300,300),(0,0,255),5,4)
cv2.rectangle(img,(150,150),(300,300),(0,0,255),5,8)
cv2.imshow("img",img)
cv2.waitKey(0)
3、画圆
circle(img: ndarray,
center: Sequence[int], #圆心
radius: int, #半径
color: Sequence[float],
thickness: int = ...,
lineType: int = ...,
shift: int = ...
cv2.circle(img,(150,150),100,(0,0,255),5,8)
4、画椭圆
ellipse(img: ndarray,
center: Sequence[int],#圆心
axes: Sequence[int],#轴半径的x与y
angle: float, #角度
startAngle: float,#起始角度
endAngle: float,#终点角度 注意是逆时针旋转的
color: Sequence[float],
thickness: int = ...,
lineType: int = ...,
shift: int = ...)
cv2.ellipse(img,(150,150),(50,150),0,0,360,(0,0,255))
5、多边形绘制
polylines(img: ndarray,
[pts]: Sequence[ndarray],#各个点的坐标,这个地方[]不能省略
isClosed: bool,
color: Sequence[float],
thickness: int = ...,
lineType: int = ...,
shift: int = ...)
pts =np.array([(250,250),(150,150),(100,50),(150,0),(250,250)],np.int32)
cv2.polylines(img,[pts],True,(0,0,255))
cv2.fillPoly(img,[pts],(0,0,255)) #填充颜色