[英]How to capture a 500 images from a video through webcam in opencv python?
我正在使用以下代码从网络摄像头捕获图像。 但我只需要在点击时捕获一些图像。
# Opens the inbuilt camera of laptop to capture video.
cap = cv2.VideoCapture(0)
i = 0
while(cap.isOpened()):
ret, frame = cap.read()
# This condition prevents from infinite looping
# incase video ends.
if ret == False:
break
# Save Frame by Frame into disk using imwrite method
cv2.imwrite('Frame'+str(i)+'.jpg', frame)
i += 1
cap.release()
cv2.destroyAllWindows()```
假设你想要 500 张图片添加:
...
i+=1
if (i+1)%500==0:
break
那很容易。 您可以使用k = cv2.waitKey(1)
并检查按下了哪个按钮。 这是一个简单的例子:
import cv2
def main():
cap = cv2.VideoCapture(0)
if not cap.isOpened(): # Check if the web cam is opened correctly
print("failed to open cam")
return -1
else:
print('webcam open')
for i in range(10 ** 10):
success, cv_frame = cap.read()
if not success:
print('failed to capture frame on iter {}'.format(i))
break
cv2.imshow('click t to save image and q to finish', cv_frame)
k = cv2.waitKey(1)
if k == ord('q'):
print('q was pressed - finishing...')
break
elif k == ord('t'):
print('t was pressed - saving image {}...'.format(i))
image_path = 'Frame_{}.jpg'.format(i) # i recommend a folder and not to save locally to avoid the mess
cv2.imwrite(image_path, cv_frame)
cap.release()
cv2.destroyAllWindows()
return
if __name__ == '__main__':
main()
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