[英]Extract part of a image using openCV
Give this a go给这个 go
import cv2 as cv import numpy as np img = cv.imread('airplane.png') cv.imshow('Original', img) blank = np.zeros(img.shape[:2], dtype='uint8') center_coordinates = (144, 233) radius = 10 mask = cv.circle(blank, center_coordinates, radius, 255, -1) masked = cv.bitwise_and(img, img, mask=mask) cv.imshow('Output', masked) cv.waitKey(0)
import cv2
import argparse
ref_point = []
crop = False
def shape_selection(event, x, y, flags, param):
global ref_point, crop
if event == cv2.EVENT_LBUTTONDOWN:
ref_point = [(x, y)]
elif event == cv2.EVENT_LBUTTONUP:
ref_point.append((x, y))
cv2.rectangle(image, ref_point[0], ref_point[1], (0, 255, 0), 2)
cv2.imshow("image", image)
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--image", required = True, help ="Path to the image")
args = vars(ap.parse_args())
image = cv2.imread(args["image"])
clone = image.copy()
cv2.namedWindow("image")
cv2.setMouseCallback("image", shape_selection)
while True:
cv2.imshow("image", image)
key = cv2.waitKey(1) & 0xFF
if key == ord("r"):
image = clone.copy()
elif key == ord("c"):
break
if len(ref_point) == 2:
crop_img = clone[ref_point[0][1]:ref_point[1][1], ref_point[0][0]: ref_point[1][0]]
cv2.imshow("crop_img", crop_img)
cv2.waitKey(0)
cv2.destroyAllWindows()
try this it will work试试这个它会工作
If you want to crop the logo out using OpenCV's cropping tool如果您想使用 OpenCV 的裁剪工具裁剪徽标
import cv2
img = cv2.imread("fight plane.png")
crop_img = img[y:y+h, x:x+w]
cv2.imshow("cropped", crop_img)
cv2.waitKey(0)
Take coordinates.取坐标。 It is extremely easy.这非常容易。 There is another question by the topic over here - How to crop an image in OpenCV using Python这里的主题还有另一个问题 - How to crop an image in OpenCV using Python
Use cv2.selectROI function使用 cv2.selectROI function
cv2.namedWindow('ROI')
# define area by mouse
r=cv2.selectROI('ROI', img,False,False)
imROI = img[int(r[1]):int(r[1]+r[3]), int(r[0]):int(r[0]+r[2])]
cv2.destroyWindow('ROI')
cv2.imshow("ROI", imROI)
cv2.waitKey(0)
cv2.destroyAllWindows()
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