cv2 getTrackbarPos不工作

在python 2.7.12中使用opencv3.1作爲cv2。我現在遇到的問題是，雖然我遵循了多套指令，似乎都使用與我自己相同的設置，或者至少有一個非常類似的指令。我主要是通過這兩個例子：openCV.org和CodeGenerater's Blogspot tutorial。我不忘記做一個回調函數或使用cv2.getTrackbarPos。我覺得在我做的或圖像顯示循環中的特定順序一定有問題。這裏是我有什麼，它diaplays與最初的TrackBar門檻的形象，但不更新與跟蹤條回調的圖像：cv2 getTrackbarPos不工作

import cv2 


#write simple callback function to pass trackbar position as *arg  
def callback(*arg): 
    pass 

#create display window for image 
cv2.namedWindow('frame') 

#read in image 
img = cv2.imread(r'/home/Usr/Documents/Aerial-Images/images_with_targets/Flight_4/target_10.jpg',0) 

#instantiate trackbar that goes in our named window and uses callback function 
cv2.createTrackbar('thresh2','frame',5,15,callback) 

#initialize thresholds 
thresh1=11 
thresh2=5 

#loop really just runs until the escape key causes a break 
while(True): 

    #sets threshold 2 to trackbar position 
    thresh2=cv2.getTrackbarPos('thresh2','frame') 
    #apply laplacian filter to ehance edge gradients 
    th = cv2.Laplacian(img,cv2.CV_8UC1) 
    #binarize image with adaptive threshold 
    th = cv2.adaptiveThreshold(th,255,cv2.ADAPTIVE_THRESH_GAUSSIAN_C,cv2.THRESH_BINARY_INV,thresh1,thresh2) 

    #show filtered image 
    cv2.imshow('frame',th) 
    #waits for escape key then breaks out of loop 
    if cv2.waitKey(0) & 0xFF == ord('q'): 
     break 


#close our display window  
cv2.destroyallwindows()

來源

2016-09-07 ThisGuyCantEven

答案是真的很簡單。在查看一些舊的代碼我寫的，我意識到我需要改變從0到1的等待鍵：

if cv2.waitKey(0) & 0xFF == ord('q'): 
    break

成爲

if cv2.waitKey(1) & 0xFF == ord('q'): 
    break

我沒有看到的是，我忘了駝峯cv2.destroyAllWindows什麼，這讓我覺得顯示器循環還在運行，但實際上並沒有。

來源

2016-09-30 17:46:40 ThisGuyCantEven

cv2 getTrackbarPos不工作

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