On 20/11/14 08:40, Markus Metz wrote:
On Wed, Nov 19, 2014 at 2:04 PM, Moritz Lennert
<[email protected]> wrote:
On 18/11/14 09:47, Markus Metz wrote:
On Sun, Nov 16, 2014 at 3:21 AM, Vaclav Petras <[email protected]>
wrote:
Hi,
I executed the examples in i.cluster and i.maxlik manuals and also the
following i.segment command:
i.segment group=lsat7_2002@w1-imagery output=lsat7_2002_segments
threshold=0.5 goodness=lsat7_2002_segments_goodness
(using the imagery group created in i.cluster example, otherwise
unrelated)
I looked at goodness from i.segment and then reject from i.maxlik. I
noticed
that there is some correlation between these two. Well, this is quite
okay
since they are using same pixel values. However, then I noticed that low
values of goodness (-5000, ...)
i.segment's goodness estimate is supposed to be in the range [0,1].
Fixed in r62793,4. Can you test again?
Could you explain / put into the manual the explanation of the calculation /
meaning of this goodness of fit ?
Done in r62830:
The goodness of fit for each pixel is calculated as 1 - distance
of the pixel to the object it belongs to. The distance is calculated
with the selected similarity method. A value of 1 means
identical values, perfect fit, and a value of 0 means maximum possible
distance, worst possible fit.
Thanks !
:-)
Moritz
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