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Date: Mon, 01 Apr 2013 13:33:36 -0400
From: Dave Angel <davea@davea.name>
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To: python-list@python.org
Subject: Re: Error in working with Dict
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On 04/01/2013 09:50 AM, inshu chauhan wrote:
> I have this program which is working with 2 dictionaries segments,
> class_counts.. but I am getting an error mentioned below the programme.
>
> import cv
> from itertools import *
> from math import floor, sqrt, ceil
> from numpy import array, dot, subtract, add, outer, argmax, linalg as lin
>
>
> def Computesegclass(segimage, refimage):
>      f = open("Pixel_count_with_region_num_trial1.txt", "w")
>      segments = {}
>      class_count = {}
>      for y in xrange(0, segimage.height):
>          for x in xrange(0, segimage.width):
>
>              if segimage[y,x] == (0.0, 0.0, 0.0):
>                  continue
>              else:
>                  seg_color = segimage[y,x]
>                  blue = int(seg_color[0])
>                  green = int(seg_color[1])
>                  red = int(seg_color[2])
>                  region_num = blue + 256 * green + 65536 * red
>                  #print region_num
>                  segments[region_num] = segments.setdefault(region_num, 0) +
> 1
>                  #print segments
>
>                  class_color = refimage[y,x]
>
>                  if class_color == (0.0,0.0,0.0):
>                      class_number = 0      # No class
>                  elif class_color == (0.0,255.0,0.0):
>                      class_number = 1   # Trees
>                  elif class_color == (255.0, 0.0, 128.0):
>                      class_number = 2   # Buildings
>                  elif class_color == (0.0,0.0,255.0):
>                      class_number = 3    # Automobiles
>                  elif class_color == (255.0, 255.0, 0.0):
>                      class_number = 4    # Road Points
>                  elif class_color == (0.0, 64.0, 128.0):
>                      class_number = 5    # Tree trunks nad branches
>                  elif class_color == (255.0, 0.0 ,0.0):
>                      class_number = 6    # Poles
>                  elif class_color == (255.0, 0.0, 255.0):
>                      class_number = 7    # Traffic Lights
>                  else:
>                      class_number = 0     # Gray Pixel
>
>                  class_count.setdefault(region_num, [0, 0, 0, 0, 0, 0, 0,
> 0])[class_number] += 1
>              # print class_count

You do realize you ended the function when you put the following line at 
the left margin?  Perhaps you really intended to put the for loop inside 
the function?  I can't tell.

You don't call Computesegclass() till later, so how can you use its 
dicts, even if it did correctly pass them back?

> for k in sorted(class_count.iterkeys()):
>      i = argmax(class_count[k])
>      print >> f, i
>
> if __name__== "__main__":
>      segimage = cv.LoadImageM(r"C:\Users\inshu\Desktop\Masters
> Thesis\Segmentation\segmentation_numbers_00000.tif",
> cv.CV_LOAD_IMAGE_UNCHANGED)
>      refimage = cv.LoadImageM(r"C:\Users\inshu\Desktop\Masters
> Thesis\Segmentation\Hand_Classified1.tif", cv.CV_LOAD_IMAGE_UNCHANGED)
>      print segimage
>      Computesegclass(segimage, refimage)
>
>
> ERROR :
>
> Traceback (most recent call last):
>    File "C:\Users\inshu\Desktop\seg.py", line 49, in <module>
>      for k in sorted(class_count.iterkeys()):
> NameError: name 'class_count' is not defined
>
> I know this error is because I have initialized both dicts inside the
> function, But why dicts are not saved out, if I intialize the dicts outside
> the function, the processing is still done inside and end result I am
> getting is an empty dict.
>
>
> Thanks in Advance for suggestions!!!!
>
>
>


-- 
DaveA