Error in working with Dict

[inshu chauhan]

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
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!!!!
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