contours, _ = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
时间: 2024-05-09 17:07:44 浏览: 28
This line of code finds the contours in a binary image.
The first argument is the binary image (thresh), which is the output of a thresholding operation.
The second argument is the contour retrieval mode, which specifies the hierarchy of contours to retrieve. cv2.RETR_TREE retrieves all of the contours and reconstructs a full hierarchy of nested contours.
The third argument is the contour approximation method, which simplifies the contour by removing redundant points. cv2.CHAIN_APPROX_SIMPLE compresses horizontal, vertical, and diagonal segments and leaves only their end points.
The function returns two values: a list of contours and the hierarchy of contours. The contours are represented as a list of points, where each point is a tuple of (x, y) coordinates. The hierarchy is represented as an array of four values: [Next, Previous, First Child, Parent].