cv2.ellipse()
OpenCV-Python是旨在解决计算机视觉问题的Python绑定库。cv2.ellipse()方法用于在任何图像上绘制椭圆。
cv2.ellipse(image, centerCoordinates, axesLength, angle, startAngle, endAngle, color [, thickness[, lineType[, shift]]])
参数：
image:它是要在其上绘制椭圆的图像。
centerCoordinates:它是椭圆的中心坐标。坐标表示为两个值的元组，即(X坐标值，Y坐标值)。
axesLength:它包含两个变量的元组，分别包含椭圆的长轴和短轴(长轴长度，短轴长度)。
angle:椭圆旋转角度，以度为单位。
startAngle:椭圆弧的起始角度，以度为单位。
endAngle:椭圆弧的终止角度，以度为单位。
color:它是要绘制的形状边界线的颜色。对于BGR，我们通过一个元组。例如：(255，0，0)为蓝色。
thickness:是形状边界线的粗细像素。厚度-1像素将用指定的颜色填充形状。
lineType:这是一个可选参数，它给出了椭圆边界的类型。
shift:这是一个可选参数。它表示中心坐标中的小数位数和轴的值。
返回值：它返回一个图像。
用于以下所有示例的图像：
示例1:
# Python program to explain cv2.ellipse() method # importing cv2 import cv2 # path path = r'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png' # Reading an image in default mode image = cv2.imread(path) # Window name in which image is displayed window_name = 'Image' center_coordinates = (120, 100) axesLength = (100, 50) angle = 0 startAngle = 0 endAngle = 360 # Red color in BGR color = (0, 0, 255) # Line thickness of 5 px thickness = 5 # Using cv2.ellipse() method # Draw a ellipse with red line borders of thickness of 5 px image = cv2.ellipse(image, center_coordinates, axesLength, angle, startAngle, endAngle, color, thickness) # Displaying the image cv2.imshow(window_name, image)
输出：
示例2:
使用-1 px的厚度和30度的旋转。
# Python program to explain cv2.ellipse() method # importing cv2 import cv2 # path path = r'C:\Users\Rajnish\Desktop\geeksforgeeks\geeks.png' # Reading an image in default mode image = cv2.imread(path) # Window name in which image is displayed window_name = 'Image' center_coordinates = (120, 100) axesLength = (100, 50) angle = 30 startAngle = 0 endAngle = 360 # Blue color in BGR color = (255, 0, 0) # Line thickness of -1 px thickness = -1 # Using cv2.ellipse() method # Draw a ellipse with blue line borders of thickness of -1 px image = cv2.ellipse(image, center_coordinates, axesLength, angle, startAngle, endAngle, color, thickness) # Displaying the image cv2.imshow(window_name, image)
输出：
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