OpenCV-Python是旨在解決計算機視覺問題的Python綁定庫。cv2.ellipse()
方法用於在任何圖像上繪製橢圓。
用法: cv2.ellipse(image, centerCoordinates, axesLength, angle, startAngle, endAngle, color [, thickness[, lineType[, shift]]])
參數:
image:它是要在其上繪製橢圓的圖像。
centerCoordinates:它是橢圓的中心坐標。坐標表示為兩個值的元組,即(X坐標值,Y坐標值)。
axesLength:它包含兩個變量的元組,分別包含橢圓的長軸和短軸(長軸長度,短軸長度)。
angle:橢圓旋轉角度,以度為單位。
startAngle:橢圓弧的起始角度,以度為單位。
endAngle:橢圓弧的終止角度,以度為單位。
color:它是要繪製的形狀邊界線的顏色。對於BGR,我們通過一個元組。例如:(255,0,0)為藍色。
thickness:是形狀邊界線的粗細像素。厚度-1像素將用指定的顏色填充形狀。
lineType:這是一個可選參數,它給出了橢圓邊界的類型。
shift:這是一個可選參數。它表示中心坐標中的小數位數和軸的值。
返回值:它返回一個圖像。
用於以下所有示例的圖像:
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)
輸出:
示例2:
使用-1 px的厚度和30度的旋轉。
# 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)
輸出:
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