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	<title>Cris's Image Analysis Blog</title>
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	<description>theory, methods, algorithms, applications</description>
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		<item>
		<title>How did this get published?</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/512</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/512#comments</comments>
		<pubDate>Wed, 19 Dec 2012 10:33:20 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[rants]]></category>
		<category><![CDATA[bad science]]></category>
		<category><![CDATA[dither]]></category>
		<category><![CDATA[error diffusion]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=512</guid>
		<description><![CDATA[&#8220;How did this get published?&#8221; is a question I regularly ask myself when reading new papers coming out. I just came a across another one of these jewels, and because the topic is that of a previous blog post here, I thought I&#8217;d share my frustration with you. The paper is entitled &#8220;On Perceptually Consistent [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Evaluating noise filters</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/490</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/490#comments</comments>
		<pubDate>Sat, 01 Sep 2012 19:29:56 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[tutorials]]></category>
		<category><![CDATA[bad science]]></category>
		<category><![CDATA[comparison]]></category>
		<category><![CDATA[evaluation]]></category>
		<category><![CDATA[filter]]></category>
		<category><![CDATA[MSE]]></category>
		<category><![CDATA[noise]]></category>
		<category><![CDATA[PSNR]]></category>
		<category><![CDATA[SSIM]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=490</guid>
		<description><![CDATA[Most of the new papers that I come across that propose a new or improved way of filtering out noise from images use the Peak Signal-to-Noise Ratio (PSNR) as a means to evaluate their results. It has been shown again and again that this is not a good way of evaluating the performance of a [...]]]></description>
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		<slash:comments>7</slash:comments>
		</item>
		<item>
		<title>ISMM 2013</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/478</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/478#comments</comments>
		<pubDate>Sat, 30 Jun 2012 15:48:48 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[announcements]]></category>
		<category><![CDATA[conference]]></category>
		<category><![CDATA[mathematical morphology]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=478</guid>
		<description><![CDATA[We are going to be organizing the 11th conference in a series dedicated to Mathematical Morphology. This is the main conference in the field, and many of the ideas within Mathematical Morphology were first presented there. I can&#8217;t count the number of times the proceedings for this series is mentioned in the reference list of [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Computing Feret diameters from the convex hull</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/408</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/408#comments</comments>
		<pubDate>Mon, 13 Feb 2012 16:45:41 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[algorithms]]></category>
		<category><![CDATA[area]]></category>
		<category><![CDATA[boundary]]></category>
		<category><![CDATA[chain code]]></category>
		<category><![CDATA[convex hull]]></category>
		<category><![CDATA[Feret]]></category>
		<category><![CDATA[length]]></category>
		<category><![CDATA[measure]]></category>
		<category><![CDATA[object]]></category>
		<category><![CDATA[polygon]]></category>
		<category><![CDATA[width]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=408</guid>
		<description><![CDATA[Some time ago I wrote about how to compute the Feret diameters of a 2D object based on the chain code of its boundary. The diameters we computed were the longest and shortest projections of the object. The shortest projection, or smallest Feret diameter, is equivalent to the size measured when physically passing objects through [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>DIPimage 2.4 released</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/456</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/456#comments</comments>
		<pubDate>Thu, 12 Jan 2012 12:49:35 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[announcements]]></category>
		<category><![CDATA[bsxfun]]></category>
		<category><![CDATA[DIPimage]]></category>
		<category><![CDATA[singleton dimension]]></category>
		<category><![CDATA[singleton expansion]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=456</guid>
		<description><![CDATA[I&#8217;m pleased to announce that a new version of DIPimage has been released. There&#8217;s some performance improvements, some bug fixes, and some new functions. The measure function has some new features also, that use the convex hull of the objects. The Feret measure is computed differently now, also using the convex hull. This makes this [...]]]></description>
		<wfw:commentRss>http://www.cb.uu.se/~cris/blog/index.php/archives/456/feed</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
		<item>
		<title>Scientific writing and the pronoun I</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/421</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/421#comments</comments>
		<pubDate>Wed, 05 Oct 2011 16:08:29 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[rants]]></category>
		<category><![CDATA[scientific paper]]></category>
		<category><![CDATA[scientist]]></category>
		<category><![CDATA[style]]></category>
		<category><![CDATA[writing]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=421</guid>
		<description><![CDATA[Why are scientists so scared of writing their statements in the first person? Open any journal, and look for the word &#8220;I&#8221;. Chances are, you won&#8217;t find it. You&#8217;ll see article authors jump through hoops just to avoid this word. As if it were dirty, illegal. For example, instead of a normal, complete sentence like [...]]]></description>
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		<slash:comments>4</slash:comments>
		</item>
		<item>
		<title>The convex hull of a 2D object</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/405</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/405#comments</comments>
		<pubDate>Sun, 18 Sep 2011 15:32:00 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[algorithms]]></category>
		<category><![CDATA[area]]></category>
		<category><![CDATA[boundary]]></category>
		<category><![CDATA[chain code]]></category>
		<category><![CDATA[convex hull]]></category>
		<category><![CDATA[convexity]]></category>
		<category><![CDATA[measure]]></category>
		<category><![CDATA[object]]></category>
		<category><![CDATA[polygon]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=405</guid>
		<description><![CDATA[Last year I wrote about computing the the boundary length and various other measures, given an object&#8217;s chain code. The chain code is a simple way of encoding the polygon that represents a 2D object. It is very simple to compute the object&#8217;s convex hull given this polygon. Why would I want to do that? [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Bresenham&#8217;s line drawing algorithm in any number of dimensions</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/400</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/400#comments</comments>
		<pubDate>Fri, 22 Jul 2011 09:17:10 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[algorithms]]></category>
		<category><![CDATA[Bresenham]]></category>
		<category><![CDATA[line]]></category>
		<category><![CDATA[MATLAB]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=400</guid>
		<description><![CDATA[edit: I should have called this &#8220;an algorithm that produces the same output as Bresenham&#8217;s algorithm, generalised to arbitrary dimensions&#8221; (see discussion below) J.E. Bresenham published an algorithm in 1965, which is used to draw 2D digital lines. Many people have extended the algorithm to work in 3D, and I&#8217;ve even found a website with [...]]]></description>
		<wfw:commentRss>http://www.cb.uu.se/~cris/blog/index.php/archives/400/feed</wfw:commentRss>
		<slash:comments>15</slash:comments>
		</item>
		<item>
		<title>Panoramic photograph stitching &#8212; again</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/393</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/393#comments</comments>
		<pubDate>Sun, 03 Apr 2011 11:02:11 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[tutorials]]></category>
		<category><![CDATA[panorama]]></category>
		<category><![CDATA[photography]]></category>
		<category><![CDATA[region growing]]></category>
		<category><![CDATA[stitching]]></category>
		<category><![CDATA[watershed]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=393</guid>
		<description><![CDATA[In an earlier post, I described and implemented a method, that was published recently, to stitch together photographs from a panoramic set. In a comment this morning, Panda asked about the parameters that direct the region merging in the watershed that I used. This set me to think about how much region merging the watershed [...]]]></description>
		<wfw:commentRss>http://www.cb.uu.se/~cris/blog/index.php/archives/393/feed</wfw:commentRss>
		<slash:comments>9</slash:comments>
		</item>
		<item>
		<title>Dithering</title>
		<link>http://www.cb.uu.se/~cris/blog/index.php/archives/355</link>
		<comments>http://www.cb.uu.se/~cris/blog/index.php/archives/355#comments</comments>
		<pubDate>Fri, 07 Jan 2011 09:20:04 +0000</pubDate>
		<dc:creator>Cris Luengo</dc:creator>
				<category><![CDATA[algorithms]]></category>
		<category><![CDATA[binary]]></category>
		<category><![CDATA[blue noise]]></category>
		<category><![CDATA[color map]]></category>
		<category><![CDATA[dither]]></category>
		<category><![CDATA[error diffusion]]></category>
		<category><![CDATA[halftone]]></category>
		<category><![CDATA[noise]]></category>
		<category><![CDATA[threshold]]></category>
		<category><![CDATA[white noise]]></category>

		<guid isPermaLink="false">http://www.cb.uu.se/~cris/blog/?p=355</guid>
		<description><![CDATA[First of all: Happy New Year! Over the holidays I&#8217;ve been learning about dithering, the process of creating the illusion of many grey levels using only black and white dots. This is used when displaying an image on a device with fewer than the 64 or so grey levels that we can distinguish, such as [...]]]></description>
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		<slash:comments>5</slash:comments>
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