OpenCV - 循环图像作为网络摄像头输入

Question

I began using OpenCV(Python) a while ago and everything went great until now. My Webcam broke and now I cant use it to test my code. Is there a way to fake the input with a simple image? It's not perfect but should be fine for simple things until the new webcam arrives.

Let's assume I have something like this:

 windowWidth = 640 windowHeight = 840 brightness = 100 cap = cv2.VideoCapture(0) cap.set(3,windowWidth) cap.set(4,windowHeight) cap.set(10,brightness) while (cap.isOpened()): success, img = cap.read() if success== True: img = cv2.flip(img, 1) cv2.imshow("output", img) if cv2.waitKey(1)& 0xFF ==ord("q"): break

This should work fine but now with the broken camera I would like to be able to "fake" the input with an image but still be able to test it just like I would using a webcam.

Something along the lines of cap = cv2.imread(testImg.PNG) which obviously does not work. I am looking for something along the lines of maybe looping the image into the webcam input to create some sort of working setup since a video is nothing more than a lot of frames in series playing.

Any suggestions are appreciated:)

Answer 1

VideoCapture is a class to interface with video streams, and a single image is returned via call to its read() method. When you call cap = cv2.imread() , you are replacing the newly created VideoCapture instance with np.ndarray instance which is returned by cv2.imread . I believe that replacing

success, img = cap.read()

with

img = cv2.imread(testImg.PNG)

would solve your problem.