OpenCV-Python is a library of Python bindings designed to solve computer vision problems. cv2.ellipse() method is used to draw a ellipse on any image.
Syntax: cv2.ellipse(image, centerCoordinates, axesLength, angle, startAngle, endAngle, color [, thickness[, lineType[, shift]]])
Parameters:
image: It is the image on which ellipse is to be drawn.
centerCoordinates: It is the center coordinates of ellipse. The coordinates are represented as tuples of two values i.e. (X coordinate value, Y coordinate value).
axesLength: It contains tuple of two variables containing major and minor axis of ellipse (major axis length, minor axis length).
angle: Ellipse rotation angle in degrees.
startAngle: Starting angle of the elliptic arc in degrees.
endAngle: Ending angle of the elliptic arc in degrees.
color: It is the color of border line of shape to be drawn. For BGR, we pass a tuple. eg: (255, 0, 0) for blue color.
thickness: It is the thickness of the shape border line in px. Thickness of -1 px will fill the shape by the specified color.
lineType: This is an optional parameter.It gives the type of the ellipse boundary.
shift: This is an optional parameter. It denotes the number of fractional bits in the coordinates of the center and values of axes.Return Value: It returns an image.
Image used for all the below examples:
Example #1:
# Python program to explain cv2.ellipse() method # importing cv2 import cv2 # path path = r'C:\Users\Rajnish\Desktop\neveropen\Lazyroar.png' # Reading an image in default modeimage = cv2.imread(path) # Window name in which image is displayedwindow_name = 'Image' center_coordinates = (120, 100) axesLength = (100, 50) angle = 0 startAngle = 0 endAngle = 360 # Red color in BGRcolor = (0, 0, 255) # Line thickness of 5 pxthickness = 5 # Using cv2.ellipse() method# Draw a ellipse with red line borders of thickness of 5 pximage = cv2.ellipse(image, center_coordinates, axesLength, angle, startAngle, endAngle, color, thickness) # Displaying the image cv2.imshow(window_name, image) |
Output:
Example #2:
Using thickness of -1 px and rotation of 30 degrees.
# Python program to explain cv2.ellipse() method # importing cv2import cv2 # pathpath = r'C:\Users\Rajnish\Desktop\neveropen\Lazyroar.png' # Reading an image in default modeimage = cv2.imread(path) # Window name in which image is displayedwindow_name = 'Image' center_coordinates = (120, 100) axesLength = (100, 50) angle = 30 startAngle = 0 endAngle = 360 # Blue color in BGRcolor = (255, 0, 0) # Line thickness of -1 pxthickness = -1 # Using cv2.ellipse() method# Draw a ellipse with blue line borders of thickness of -1 pximage = cv2.ellipse(image, center_coordinates, axesLength, angle, startAngle, endAngle, color, thickness) # Displaying the imagecv2.imshow(window_name, image) |
Output:
