如何在python上从for循环加载数据？

Question

你好，我试着合并检测.多尺度机智计算历史代码。我试着运行这个程序，但是我不能在for in循环中访问'w'。？？在

import cv2
import numpy as np 
from matplotlib import pyplot as plt
import time
import sys
import serial

#execfile("/home/arizal/Documents/Sorting Jeruk/motor1.py")

#ser = serial.Serial('/dev/ttyACM0', 9600)

#Cascade jeruk
jeruk_cascade = cv2.CascadeClassifier('cascade.xml')

camera = cv2.VideoCapture(1)

base1 = cv2.imread('base11.jpg')
base2 = cv2.imread('base22.jpg')
base3 = cv2.imread('base33.jpg')

#Set hist parameters
hist_height = 64
hist_width = 256
nbins = 32
bin_width = hist_width/nbins
hrange = [0,180]
srange = [0,256]
ranges = hrange+srange                                  # ranges = [0,180,0,256]

#Create an empty image for the histogram
e = np.zeros((hist_height,hist_width))
#print ("h : ",h)
#print type(h)

#x=1

这是为了检测.多尺度循环

^{pr2}$

这对于级联循环，对于在对象上给出矩形标记

    # add this
    for (x,y,w,h) in jeruks:

        cv2.rectangle(img,(x,y),(x+w,y+h),(17,126,234),2)
        font = cv2.FONT_HERSHEY_SIMPLEX
        cv2.putText(img,'Jeruk',(x+w,y+h), font, 1, (17,126,234), 2, cv2.LINE_AA) #---write the text

        roi_gray = cam[y:y+h, x:x+w]
        roi_color = img[y:y+h, x:x+w]

当目标被探测到时计算直方图

    if w > 250 :
        print ('w', w)

        histcam = cv2.calcHist([cam], [0], None, [nbins], [0,256])
        cv2.normalize(histcam,histcam, hist_height, cv2.NORM_MINMAX)
        hist=np.int32(np.around(histcam))

但我有个错误：

 Traceback (most recent call last):
   File "/home/arizal/Documents/Sorting Jeruk/doalcoba.py", line 65, in      <module>
     if w > 250 :
 NameError: name 'w' is not defined

有人能帮我吗？在

Answer 1

我觉得你的代码有问题。在法典中-

for (x,y,w,h) in jeruks:
    ....

以及

^{pr2}$

在相同的缩进水平。(x,y,w,h)仅对for循环可用，不在循环之外。修复缩进-

for (x,y,w,h) in jeruks:
    ....
    if w > 250 :
        print ('w', w)

如果行得通请告诉我