Opencv：用python导入highgui

Question

使用以下代码：

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()

Traceback（最近一次调用最后一次）： 文件“pycam.py”，第 21 行，位于 重复（） 文件“pycam.py”，第 12 行，重复 c = highgui.cvWaitKey(10) NameError：未定义全局名称“highgui” 清理了相机。

Answer 1

新的 API 发生了相当多的变化。以下内容将起作用：

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()

这是一种更简单、更清晰的语法！

Answer 2

这意味着 highgui 不存在。尝试通过以下方式导入：from opencv import *。

如果这不起作用，请尝试检查您的 opencv 安装。