SimpleCV Webcam Trouble.

[davef21370]

Just messing with SimpleCV edge detection and came across a small problem. The first time I run the script all is good and I get nicely defined edges but on exit the webcam stays on.
Run the script again and I just get a blank (black) window. Run it again and all works well but once more the webcam stays on and I get a blank window the next time and so on, and so on.
I've tried "del cam" and "del disp" as suggested on other forums but nothing works.
Is there a way to tidy everything up on exit ?

Code: Select all

from SimpleCV import *
import time

try:
    cam = Camera()
    disp = Display((640,480))
    
    while not disp.isDone():
        img = cam.getImage()
        edge = img.edges(t1=160)
        edge.show()
        time.sleep(0.04)

except:
    pass
        

Dave.

[davef21370]

Update. I've removed the try/except and on closing the window was presented with this error...

Code: Select all

Traceback (most recent call last):
  File "C:\Users\davef_000\Downloads\helloworld.py", line 7, in <module>
    while not disp.isDone():
  File "C:\Python27\lib\site-packages\SimpleCV\Display.py", line 650, in isDone
    self.checkEvents()
  File "C:\Python27\lib\site-packages\SimpleCV\Display.py", line 615, in checkEvents
    pressed = pg.key.get_pressed()
error: video system not initialized

so my original attempt at using "del cam" was never executed.

I now have the following which works

Code: Select all

from SimpleCV import *
import time

try:
    cam = Camera()
    disp = Display((640,480))
    
    while not disp.isDone():
        img = cam.getImage()
        img = img.flipHorizontal()
        edge = img.edges(t1=200)
        edge.show()
        time.sleep(0.04)

except:
    del cam
        

but it isn't a great fix. Any ideas ?

Dave.