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Date: Thu, 18 Apr 2013 19:28:16 +0530
Subject: Working with lists within Dictionaries
From: inshu chauhan <insideshoes@gmail.com>
To: "python-list@python.org" <python-list@python.org>
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Hello Everyone,

I am trying to work with lists and dictionaries together.
In the following code I have to access pixels in a segmented image through
a dictionary. But the problem is when I am trying to update the list
through dict it is giving me this error of tuple, ofcourse because list
indices should be integer.

THE CODE IS :
import cv
def access_segments(segimage, data):
    print segimage
    segments = {}
    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])
                reg_num = blue + 256 * green + 65536 * red
                point = data[y,x]
                segments.setdefault(reg_num, [])[point] += point

    for p in sorted(segments.iterkeys()):
        points = (segments[p])
        print len(points)
        print points

if __name__== "__main__":
    data = cv.Load(r"C:\Users\inshu\Desktop\Masters
Thesis\data\xyz_00000.yml")
    segimage = cv.LoadImageM(r"C:\Users\inshu\Desktop\Masters
Thesis\Segmentation\segmentation_numbers_00000.tif",
cv.CV_LOAD_IMAGE_UNCHANGED)
    access_segments(segimage, data)


THE ERROR IS:

<cvmat(type=42424010 8UC3 rows=3000 cols=3000 step=9000 )>

Traceback (most recent call last):
  File "C:\Users\inshu\Desktop\test_reading .py", line 27, in <module>
    access_segments(segimage, data)
  File "C:\Users\inshu\Desktop\test_reading .py", line 16, in
access_segments
    segments.setdefault(reg_num, [])[point] += point
TypeError: list indices must be integers, not tuple

How can I access the data without getting this error ? the points have x,
y, z co-ordinates.

Thanks In Advance for your suggestions.

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello Everyone,=A0<div><br></div><div style>I am trying to=
 work with lists and dictionaries together.=A0</div><div style>In the follo=
wing code I have to access pixels in a segmented image through a dictionary=
. But the problem is when I am trying to update the list through dict it is=
 giving me this error of tuple, ofcourse because list indices should be int=
eger.=A0</div>
<div style><br></div><div style>THE CODE IS :</div><div style><div>import c=
v</div><div>def access_segments(segimage, data):</div><div>=A0 =A0 print se=
gimage</div><div>=A0 =A0 segments =3D {}</div><div>=A0 =A0 for y in xrange(=
0, segimage.height):</div>
<div>=A0 =A0 =A0 =A0 for x in xrange(0, segimage.width):</div><div>=A0 =A0 =
=A0 =A0 =A0 =A0 if segimage[y,x] =3D=3D (0.0, 0.0, 0.0):</div><div>=A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 continue</div><div>=A0 =A0 =A0 =A0 =A0 =A0 else:</d=
iv><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 seg_color =3D segimage[y,x]</div>
<div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 blue =3D int(seg_color[0])</div><div>=
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 green =3D int(seg_color[1])</div><div>=A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 red =3D int(seg_color[2])</div><div>=A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 reg_num =3D blue + 256 * green + 65536 * red</div>
<div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 point =3D data[y,x]</div><div>=A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 segments.setdefault(reg_num, [])[point] +=3D point<=
/div><div>=A0 =A0 =A0 =A0 =A0 =A0=A0</div><div>=A0 =A0 for p in sorted(segm=
ents.iterkeys()):</div><div>=A0 =A0 =A0 =A0 points =3D (segments[p])</div>
<div>=A0 =A0 =A0 =A0 print len(points)</div><div>=A0 =A0 =A0 =A0 print poin=
ts</div><div><br></div><div>if __name__=3D=3D &quot;__main__&quot;:</div><d=
iv>=A0 =A0 data =3D cv.Load(r&quot;C:\Users\inshu\Desktop\Masters Thesis\da=
ta\xyz_00000.yml&quot;)</div>
<div>=A0 =A0 segimage =3D cv.LoadImageM(r&quot;C:\Users\inshu\Desktop\Maste=
rs Thesis\Segmentation\segmentation_numbers_00000.tif&quot;, cv.CV_LOAD_IMA=
GE_UNCHANGED)</div><div>=A0 =A0 access_segments(segimage, data)</div><div>=
=A0 =A0=A0</div>
<div><br></div><div style>THE ERROR IS:</div><div style><br></div><div styl=
e><div>&lt;cvmat(type=3D42424010 8UC3 rows=3D3000 cols=3D3000 step=3D9000 )=
&gt;</div><div><br></div><div>Traceback (most recent call last):</div><div>=
=A0 File &quot;C:\Users\inshu\Desktop\test_reading .py&quot;, line 27, in &=
lt;module&gt;</div>
<div>=A0 =A0 access_segments(segimage, data)</div><div>=A0 File &quot;C:\Us=
ers\inshu\Desktop\test_reading .py&quot;, line 16, in access_segments</div>=
<div>=A0 =A0 segments.setdefault(reg_num, [])[point] +=3D point</div><div>T=
ypeError: list indices must be integers, not tuple</div>
</div><div style><br></div><div style>How can I access the data without get=
ting this error ? the points have x, y, z co-ordinates.</div><div style><br=
></div><div style>Thanks In Advance for your suggestions.=A0</div></div></d=
iv>

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