Cv2 minenclosingcircle

1. What is cv2 contourArea?
2. How do I close contours in OpenCV?
3. How to detect rectangle in image using OpenCV Python?
4. How do you show bounding box in OpenCV?

What is cv2 contourArea?

The extent of an object is computed as the ratio of contour area to its bounding rectangle area. So, to compute the extent, we first have to find the contour area and bounding rectangle area. The contour area of an object can be found using cv2. contourArea() function.

How do I close contours in OpenCV?

1) You can use morphological operators to close your image borders (dilate and so on). 2) You can threshold your image using Otsu methods, then finding the borders.

How to detect rectangle in image using OpenCV Python?

Python - OpenCV & PyQT5 together

If the number of vertex points in the approximate contour is 4 then we compute the aspect ratio to make a difference between the rectangle and square. If the aspect ratio is between 0.9 and 1.1 we say it is a square else a rectangle See the below pseudocode.

How do you show bounding box in OpenCV?

To draw a bounding box around an object in the given image, we make use of a function called selectROI() function in OpenCV. The image on which the bounding box is to be drawn using selectROI() function is read using imread() function.