How to determine if a pixel is inside a contour?

1. How do you check if a point is inside a contour?
2. How do you make contours in Opencv?

How do you check if a point is inside a contour?

To determine if a point is inside, outside, or on the edge of a shape you can check if the point is within a contour using cv2. pointPolygonTest() . The function returns +1 , -1 , or 0 to indicate if a point is inside, outside, or on the contour, respectively.

How do you make contours in Opencv?

To draw the contours, cv. drawContours function is used. It can also be used to draw any shape provided you have its boundary points. Its first argument is source image, second argument is the contours which should be passed as a Python list, third argument is index of contours (useful when drawing individual contour.