python opencv 鼠标提取矩形（Rectangle）ROI

方法：获取鼠标点击事件

代码

# import the necessary packages
import argparse
import cv2
# initialize the list of reference points and boolean indicating
# whether cropping is being performed or not
refPt = []
cropping = False
def click_and_crop(event, x, y, flags, param):# grab references to the global variablesglobal refPt, cropping# if the left mouse button was clicked, record the starting# (x, y) coordinates and indicate that cropping is being# performedif event == cv2.EVENT_LBUTTONDOWN:refPt = [(x, y)]cropping = True# check to see if the left mouse button was releasedelif event == cv2.EVENT_LBUTTONUP:# record the ending (x, y) coordinates and indicate that# the cropping operation is finishedrefPt.append((x, y))cropping = False# draw a rectangle around the region of interestcv2.rectangle(image, refPt[0], refPt[1], (0, 255, 0), 2)cv2.imshow("image", image)# construct the argument parser and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--image", required=True, help="Path to the image")
args = vars(ap.parse_args())
# load the image, clone it, and setup the mouse callback function
image = cv2.imread(args["image"])
clone = image.copy()
cv2.namedWindow("image")
cv2.setMouseCallback("image", click_and_crop)
# keep looping until the 'q' key is pressed
while True:# display the image and wait for a keypresscv2.imshow("image", image)key = cv2.waitKey(1) & 0xFF# if the 'r' key is pressed, reset the cropping regionif key == ord("r"):image = clone.copy()# if the 'c' key is pressed, break from the loopelif key == ord("c"):break
# if there are two reference points, then crop the region of interest
# from teh image and display it
if len(refPt) == 2:roi = clone[refPt[0][1]:refPt[1][1], refPt[0][0]:refPt[1][0]]cv2.imshow("ROI", roi)cv2.waitKey(0)
# close all open windows
cv2.destroyAllWindows()

结果

参考资料

https://github.com/xuyangcao/random_walker_gui
Capturing mouse click events with Python and OpenCV

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python opencv 鼠标提取矩形（Rectangle）ROI

参考资料

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