CODEWITHSUNDEEP
pythonopencv
user5569788
user5569788

Reputation:

Only do action if rectangle exists in OpenCV

I'm learning OpenCV (and Python) and have managed to get OpenCV to detect my nose and move the mouse using the movement of my nose, but since it looses track of my nose often I want it to fall back to moving using my face instead of my nose if needed. I've managed to draw rectangles around my face and my nose in video.

I tried being cheeky and just putting the loop for my face rectangle in "if cv2.rectangle" (for the nose), but it is always true. My question is how can I create a test to see if nose is detected fallback to move mouse with face, and if nose is re-detected go back to using the nose.

My loops as of now 

  # Here we draw the square around the nose, face and eyes that is detected.
    for (x,y,w,h) in nose_rect:
        cv2.rectangle(frame, (x,y), (x+w,y+h), (0,0,255), 3)
        if cv2.rectangle:
            m.move(x * 4, y * 4) # TODO: Write and if that goes into face if nose is not visible
            break
        else:
            for (x, y, w, h) in face_rect:
                cv2.rectangle(frame, (x, y), (x + w, y + h), (0, 255, 0), 3)
                break

    for (x,y,w,h) in eye_rect:
        cv2.rectangle(frame, (x,y), (x+w,y+h), (205,0,0), 3)
        break

I can post my entire program if that helps, I've tried doing a bunch of the OpenCV official tutorials but did not managed to find an answer to my question there.

Thank you for all replies!

PS: I'm using Python 3.5

Upvotes: 2

Views: 788

Answers (1)

Udayraj Deshmukh
Udayraj Deshmukh

Reputation: 1914

Here's the snippet you should use in your code-

    if(len(nose_rect)>0): 
        print ("Only Nose")
        for (x,y,w,h) in nose_rect:
            cv2.rectangle(frame, (x,y), (x+w,y+h), (0,0,255), 3)
            #Here we say that m (the variable created before, should move the mouse using the x, and y variable from the nose rect.
            # We have acellerated movement speed by 4 to make it possible to navigate the cursor through the whole screen.
            m.move(x * 4, y * 4) # TODO: Write and if that goes into face if nose is not visible
    elif (len(face_rect)>0):
        print ("Only Face")
        for (x,y,w,h) in face_rect:
            cv2.rectangle(frame, (x,y), (x+w,y+h), (0,255,0), 3)
    elif (len(face_rect)>0):
        print ("Only Eye")
        for (x,y,w,h) in eye_rect:
            cv2.rectangle(frame, (x,y), (x+w,y+h), (205,0,0), 3)
    else:
        print ("Nothing detected.")

Also, for waiting use the time.sleep() method

    time.sleep(0.001) # Waiting 1 millisecond to show the next frame.
    if (cv2.waitKey(1) & 0xFF == ord('q')):#exit on pressing 'q'
     break

Upvotes: 1

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