OpenCV with Logitech Pro 4000 on the Raspberry Pi

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It looks like some OS related issue. Are you sure, that all needed drivers are loaded and works properly. OpenCV uses standard V4L and V4L2 interfaces for cameras. Is it properly enabled on your platform?

For me,

import cv2.cv

is not working. Try :

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

while(True):
    #capture frame-by-frame
    ret = cap.set(3,160) #set Width 
    ret = cap.set(4, 120) #set Heigth
    #ret = cap.set(5, .0) NOT working on Logitech QuickCam: No FPS setting :(
    ret, frame = cap.read()

    #our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    #Display the resulting frame
    cv2.imshow('frame', gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()