<html>
<head>
<base href="http://fiji.sc/bugzilla/" />
</head>
<body><span class="vcard"><a class="email" href="mailto:g.landini@bham.ac.uk" title="G. Landini <g.landini@bham.ac.uk>"> <span class="fn">G. Landini</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Bug in the Intermodes algorithm of threshold"
href="http://fiji.sc/bugzilla/show_bug.cgi?id=938">bug 938</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEEDSINFO
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Bug in the Intermodes algorithm of threshold"
href="http://fiji.sc/bugzilla/show_bug.cgi?id=938#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Bug in the Intermodes algorithm of threshold"
href="http://fiji.sc/bugzilla/show_bug.cgi?id=938">bug 938</a>
from <span class="vcard"><a class="email" href="mailto:g.landini@bham.ac.uk" title="G. Landini <g.landini@bham.ac.uk>"> <span class="fn">G. Landini</span></a>
</span></b>
<pre>Hi, just a quick update. The Intermodes threshold method 'fails' in the 16bit
image because the histogram is not bimodal. The value of 525 is just the min
value of the image-1. I do not consider this is a bug because the plugin
explains the situation in the Log window.
Now, about the issue of with why this works differently with the
Adjust>Threshod command. I am almost sure that this is because that command
packs the 16bit histogram into an 8 bit space (i.e. 256 bins) and thresholds
that histogram. You get the 'correct' result by converting the image to 8 bits
and using the Auto_Threshold plugin Intermodes method (if you do it you will
find that the binary result is identical on that neuron image).
A bit counter-intuitive, but a 16bit image and the same converted to 8 bits are
not the same, and we should not expect the same result for all the methods.
I am marking this as "Invalid" as I do not think there is a bug, just a
confusing situation, but please feel free to reopen if you think otherwise.
By the way, the issue raised about line 199, I think it is correct as is. The
histogram is sequentially, so this has to be done on the the same array.
One more thing, I could add to the code to return "-1" if the method fails. Now
it returns the minimum grey value of the histogram-1. Not sure if that makes it
any clear; suggestions are welcome.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>