opencv的：進口highgui與蟒蛇

Question

用下面的代碼：

import cv 

cv.NamedWindow("w1", cv.CV_WINDOW_AUTOSIZE) 
camera_index = 0 
capture = cv.CaptureFromCAM(camera_index) 

def repeat(): 
    global capture #declare as globals since we are assigning to them now 
    global camera_index 
    frame = cv.QueryFrame(capture) 
    cv.ShowImage("w1", frame) 
    c = highgui.cvWaitKey(10) 
    if(c=="n"): #in "n" key is pressed while the popup window is in focus 
    camera_index += 1 #try the next camera index 
    capture = cv.CaptureFromCAM(camera_index) 
    if not capture: #if the next camera index didn't work, reset to 0. 
     camera_index = 0 
     capture = cv.CaptureFromCAM(camera_index) 

while True: 
    repeat() 

回溯（最近通話最後一個）： 文件 「pycam.py」，第21行，在 重複（） 文件「pycam。 py「，第12行，重複 c = highgui.cvWaitKey（10） NameError：全局名稱'highgui'未定義 已清理攝像頭。

Answer 1

這意味着highgui不存在。嘗試以這種方式導入：from opencv import *。

如果這不起作用，請嘗試並檢查您的opencv安裝。

Answer 2

新API已經發生了很多變化。以下將起作用：

import cv 

cv.NamedWindow("w1", cv.CV_WINDOW_AUTOSIZE) 
camera_index = 0 
capture = cv.CaptureFromCAM(camera_index) 

def repeat(): 
    global capture #declare as globals since we are assigning to them now 
    global camera_index 
    frame = cv.QueryFrame(capture) 
    cv.ShowImage("w1", frame) 
    c = cv.WaitKey(10) 
    if(c=="n"): #in "n" key is pressed while the popup window is in focus 
    camera_index += 1 #try the next camera index 
    capture = cv.CaptureFromCAM(camera_index) 
    if not capture: #if the next camera index didn't work, reset to 0. 
     camera_index = 0 
     capture = cv.CaptureFromCAM(camera_index) 

while True: 
    repeat() 

這是一個更簡單，更乾淨的語法！