나가서 설명하자면 NameError : 전역 이름 'initialZ은'

Question

는 오류 표시

Traceback (most recent call last): 
    File "C:\Python27\sample\sample1.py", line 119, in <module> 
    Position(np.array(list(threshold))) 
    File "C:\Python27\sample\sample1.py", line 57, in Position 
    print " Z = " ; print initialZ 
NameError: global name 'initialZ' is not defined 

코드

import cv2 
import numpy as np 
H_MIN = 0; 
H_MAX = 256; 
S_MIN = 0; 
S_MAX = 256; 
V_MIN = 0; 
V_MAX = 256; 
lastX = -1 
lastY = -1 

def nothing(x): 
    pass 

def morphOps(thresh): 

    #create structuring element that will be used to "dilate" and "erode" image. 
    #the element chosen here is a 3px by 3px rectangle 

    erodeElement = cv2.getStructuringElement(cv2.MORPH_RECT, (3,3)); 
    #dilate with larger element so make sure object is nicely visible 
    dilateElement = cv2.getStructuringElement(cv2.MORPH_RECT,(8,8)); 

    cv2.erode(thresh,thresh,erodeElement); 
    cv2.erode(thresh,thresh,erodeElement); 

    cv2.dilate(thresh,thresh,dilateElement); 
    cv2.dilate(thresh,thresh,dilateElement); 

i = 0 

def initialValue(z): 
    global i 

    if i == 0: 
     initialZ = z 
     i = i + 1 
     return initialZ 

def Position(thresh): 
    #moments are used to identify the shapes of the tracked image 
     mu = cv2.moments(thresh,True); 
     mx = mu['m10'] 
     my = mu['m01'] 
     area = mu['m00'] 

     if(area>100): 
     X = mx/area; 
     Y = my/area; 
     Z = area; 

     initialValue(Z) 
     print " Z = " ; print initialZ 

     if lastX>=0 & lastY>=0 & X>=0 & Y>=0 : 
      print X ,Y, Z 
      dX = X - 325; 
      dY = 233 - Y; 
      dZ = Z - initialZ; 
      print " dX = "; print dX 
      print " dY = "; print dY 
      print " dZ = "; print dZ 

     lastX=X; 
     lastY=Y; 

videoCapture = cv2.VideoCapture('E:\Intern MNIT(gait motions)\Sample video.mp4') 
fps = videoCapture.get(cv2.cv.CV_CAP_PROP_FPS) 
print 'Frame per seconds : '; print fps 

while 1 : 
    frame,cameraFeed = videoCapture.read() 
    HSV = cv2.cvtColor(cameraFeed,cv2.COLOR_BGR2HSV); 
    #cv2.imshow('ORIGINAL' ,cameraFeed) 
    #cv2.imshow('HSV' ,HSV) 
    # define range of color in HSV 
    lower = np.array([0,0,0]) 
    upper = np.array([256,256,256]) 

    #thresholding image 
    threshold = cv2.inRange(HSV,lower,upper) 

    #call morphOps function 
    morphOps(np.array(list(threshold))) 

    #cv2.imshow('Threshold Image' ,threshold) 

    #call Position Function 
    Position(np.array(list(threshold))) 

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


videoCapture.release()  
cv2.destroyAllWindows() 

Answer 1

와

initialValue(Z) 
    print " Z = " ; print initialZ 

를 교체 정의되지 않은

initialZ = initialValue(Z) 
    print " Z = " ; print initialZ 

Answer 2

이것은 파이썬에서 전역 변수를 정의하는 방법입니다.

#!/usr/bin/env python 

def main(): 
    compute_something() 
    global i_am_global 
    #use this variable anywhere now. 
if __name__ = "__main__" 
main()