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5/13/2019

Oops! They Did it Again (Manchester City)

Filed under: schestowitz.com @ 05:11 AM

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Oops! They Did it Again (Manchester City)

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4/29/2019

Comment on Working With the FRGC 3-D Faces Database – Part I by Anonymous

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3/4/2019

When Winter Feels Like Summer

Filed under: schestowitz.com @ 06:21 AM

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When Winter Feels Like Summer

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Manchester City is Now Very Well Positioned to Break More Records

Filed under: schestowitz.com @ 06:02 AM

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Manchester City is Now Very Well Positioned to Break More Records

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3/3/2019

The Man Who Burned Chelsea Manning is Bossed by Chelsea Clinton. Nowadays His Articles Are Anti-Wikileaks Tripe.

Filed under: schestowitz.com @ 08:34 AM

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The Man Who Burned Chelsea Manning is Bossed by Chelsea Clinton. Nowadays His Articles Are Anti-Wikileaks Tripe.

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2/17/2019

The Only Wikileaks ‘Collusion’ is a Trump/Pence Collusion to Have Julian Assange Arrested and Wikileaks Shut Down

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The Only Wikileaks ‘Collusion’ is a Trump/Pence Collusion to Have Julian Assange Arrested and Wikileaks Shut Down

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1/18/2019

Manchester City Football Club Treats Supporters as Marketing Material

Filed under: schestowitz.com @ 06:25 PM

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Manchester City Football Club Treats Supporters as Marketing Material

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12/7/2018

When Those Who Expose Crimes Are Treated by the State Like the Criminals

Filed under: schestowitz.com @ 06:56 PM

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When Those Who Expose Crimes Are Treated by the State Like the Criminals

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11/6/2018

Gab is Not a Site That Tolerates Nazis. It is a Nazi Site That Bans People Who Object to Nazism. It’s a Censorship Site With a Dangerous Agenda.

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Gab is Not a Site That Tolerates Nazis. It is a Nazi Site That Bans People Who Object to Nazism. It’s a Censorship Site With a Dangerous Agenda.

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10/21/2018

Comment on Amazon AWS Used for DDOS Attacks Against My Web Sites, Amazon Takes 14 Hours to Reply But Not Take Action (Updatedx5) by Onur

Filed under: Comments for schestowitz.com @ 08:49 AM

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7/18/2018

Gab Isn’t “Free Speech” But a “Safe Space” for Bigots That Censors Innocent Accounts Without Warning and Without Explanation for the Censorship

Filed under: schestowitz.com @ 07:54 AM

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Gab Isn’t “Free Speech” But a “Safe Space” for Bigots That Censors Innocent Accounts Without Warning and Without Explanation for the Censorship

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6/18/2018

Nearly a Decade in Twitter and Half a Million Tweets

Filed under: schestowitz.com @ 06:29 AM

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Nearly a Decade in Twitter and Half a Million Tweets

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12/1/2017

Comment on Mastodon is Free Software, But It Does Not Respect Free Speech (Updated) by Roy Schestowitz

Filed under: Comments for schestowitz.com @ 07:54 PM

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Comment on Mastodon is Free Software, But It Does Not Respect Free Speech (Updated) by Nathan Hawks

Filed under: Comments for schestowitz.com @ 06:07 PM

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Comment on Mastodon is Free Software, But It Does Not Respect Free Speech (Updated) by Nathan Hawks

Filed under: Comments for schestowitz.com @ 06:03 PM

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11/26/2017

Comment on Mastodon is Actually a Lot Worse Than Twitter When it Comes to Free Speech. Avoid It. by mama21mama

Filed under: Comments for schestowitz.com @ 04:26 PM

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11/25/2017

Comment on Mastodon is Actually a Lot Worse Than Twitter When it Comes to Free Speech. Avoid It. by Roy Schestowitz

Filed under: Comments for schestowitz.com @ 05:49 PM

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11/24/2017

Comment on Mastodon is Actually a Lot Worse Than Twitter When it Comes to Free Speech. Avoid It. by MSH

Filed under: Comments for schestowitz.com @ 09:46 AM

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Comment on Mastodon is Actually a Lot Worse Than Twitter When it Comes to Free Speech. Avoid It. by Roy Schestowitz

Filed under: Comments for schestowitz.com @ 08:21 AM

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Comment on Mastodon is Actually a Lot Worse Than Twitter When it Comes to Free Speech. Avoid It. by Roy Schestowitz

Filed under: Comments for schestowitz.com @ 07:43 AM

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1/1/1970

Oxford Presentation on Appearance Model and Non-rigid Registration Evaluation

As anticipated, there has been little or no activity lately. However, I presented some of the latest development at Oxford last week. The presentation slides are finally online (in a variety of formats). <ul> <li><a href="/Research/Presentations/2006/MIAS-IRC-2006/final">HTML</a></li><li> <a href="/Research/Presentations/2006/MIAS-IRC-2006/MIAS-IRC_2006-final.pdf">PDF</a></li><li> <a href="/Research/Presentations/2006/MIAS-IRC-2006/MIAS-IRC_2006-final.swf">Flash/SWF</a></li><li> <a href="/Research/Presentations/2006/MIAS-IRC-2006/MIAS-IRC_2006-final.odp">OpenDocument Presentation</a></li><li> <a href="/Research/Presentations/2006/MIAS-IRC-2006/MIAS-IRC_2006-final.ppt">PowerPoint</a></li> </ul> Regarding progress, I handed in a draft of my thesis at the end of August. I am still waiting for feedback. more

Presentations, Thesis and Halting of Technical Progress

[<em>This will be personal item rather than a technical one</em>] am attending Medical Image Understanding and Analysis 2006, which begins later today. I will present my work tomorrow. There is also the possibility of a meeting at UCL next week -- one whose aim is to unify registration, modelling, and segmentation. It is part of a long on-going effort which occupies the entire inter-disciplinary research collaboration (IRC). I write up my thesis nowadays, so it is unlikely that I will make any technical progress in the next few months. I will try to post technical items as soon as something interesting emerges. more

An Update on Publications

S of last night, a revised submission was sent to be considered for a special TMI issue on validation. This time, for a change, we included time estimates for ground-truth-free assessement on non-rigid registration in 3-D. <br><br> Concurrently, a related paper was accepted as an oral presentation in Medical Image Understanding and Analysis (MIUA) 2006. I will post a link to that paper as soon as I put it online. more

NRR Assessment: 3-D Extension and Other News

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Entropic Measures for Model and NRR Evaluation

URTHER on the subject of <a href="http://schestowitz.com/MARS/modules.php?name=News&file=article&sid=24">entropy in registration and model assessment</a>, there is finally an intent to publish a paper -- one which explains it in greater level of detail. The process involves treating non-rigid registration (NRR) results merely as correspondence. This correspondence builds an appearance model, for which an entropy can be computed. An entropy can be perceived as a measure of complexity as it corresponds to minimal message length that can <em>encapsulate</em> -- in this particular case -- a model of appearance. By computing such entropies, not only can the models be evaluated, but also the NRR algorithms from which these model were built. This essentially enables one to measure both NRR quality <em>and</em> model quality in an information-theoretic fashion. This method requires no ground-truth knowledge or manual annotation of any kind.<br><br> more

Conference Paper on Non-Rigid Registration (NRR) Validation

Our paper to <a href="http://www.biomedicalimaging.org/">ISBI 2006</a> has just been accepted and it is available on-line as well: <ul> <li><a href="/Research/Papers/2006/ISBI_2006/Final/isbi_2006.pdf">PDF</a></li> <li><a href="/Research/Papers/2006/ISBI_2006/Final/HTML">HTML</a></li> </ul> <b>Abstract</b>: E compare two methods for assessing the performance of groupwise non-rigid registration algorithms. One approach, which has been described previously, utilizes a measure of overlap between data labels. Our new approach exploits the fact that, given a set of non-rigidly registered images, a generative statistical appearance model can be constructed. We observe that the quality of the model depends on the quality of the registration, and can be evaluated by comparing synthetic images sampled from the model with the original image set. We derive indices of model specificity and generalisation that can be used to assess model/registration quality. We show that both approaches detect the loss of registration as a set of correctly registered MR images of the brain is progressively perturbed. We compare the sensitivities of the different methods and show that, as well as requiring no ground truth, our new specificity measure provides the most sensitive approach to detecting misregistration. <br> more

kNN and Entropy in Registration and Model Assessment

<b>REVIOSULY we used model indices, which we called Generalisation and Specificity, to assess the quality of appearance models, as well as the quality of non-rigid registration</b>. We have now identified a valuable surrogate to these indices: Shannon's entropy. Some work by Hero <em>et al</em>. is encouraging the use of entropic measures to assess (dis-)similarity of graphs. This is practically used as non-rigid registration similarity measures -- somewhat reminiscent of mutual information (MI). <br><br> We intend to see if an entropic measure of clouds overlap suprasses the performance of Generalisation and Specificity. We also consider image distances that are based on K nearest neighbours (kNN) or the nearest match to a pixel intensity, a map of which is shown below. Since it takes around 20 minutes to generate each of the images below, we consider this to be highly impractical. To run just a single such model evaluation, we would need over 60,000 hours of computer power. And this is 2-D only... <br><br> Extension of our approach to 3-D is foreseen nonetheless. It will probably use the methods which require only a couple of hours of computation in 2-D. Resolution 'pyramiding' (coarse-to-fine approach) can assist in terms of speed. <br> <br>Top: original image; Bottom: nearest match to pixel of greyscale value 20, 60, 100 (left-to-right) for each of the other pixels in the image more

Registration Assessment Abstract

We shall be presenting our registration assessment work this Tuesday. A camera-ready version of the accompanying 2-page abstract is available on-line: <ul> <li><a href="/Research/Papers/2005/MIAS_IRC_2005/Final/manchester_mias-irc_final.pdf">PDF</a> </li> <li><a href="/Research/Papers/2005/MIAS_IRC_2005/Final/HTML">HTML</a> </li> </ul> more

Registration Benchmark

E may soon start working in collaboration with the <a href="http://www-ipg.umds.ac.uk/mias/gridprojects/miasgrid.shtml">MIAS-Grid</a>, as well as the IRC. MIAS-Grid, where MIAS stands for Medical Images and Signals, is a project which ultimately produces an e-Science workbench for medical image analysis. To demonstrate the utility of the system, a series of use-cases is required and our code might be among these. <br><br> Essentially, the Grid might have our registration assessment algorithms re-created. It will then compartmentale the processes and carry out some analysis in a transparent way that has robust, well-understood interfaces (e.g. <a href="http://www.xmlrpc.com/">XML-RPC</a>). Subsequently, these processes can be embedded as workflows within the workbench, which might involve autonomous and powerful computers. Algorithms can easily be exchanged, thus enabling benchmarks (comparisons) to be rapidly conducted. The idea is reminiscent of the principles and rationale behind the Strategy Patten in OO programming. <br><br> <a href="/IMG/research/registration_benchmark_framework.png"></a><br> Image registration assessment: the benchmark architecture<br> Click image for full-sized version <br><br> We are not too certain about the future of this initiative and, in particular, some of the technicalities. Yet, we would feel privileged to have an opportunity to work on such modern computing architectures. Our particular set of binaries can directly benefit from parallel workflows. In short, here is the framework that can be envisioned already: <ul> <li>We are given a set of N images</li> <li>We have M such image sets</li> <li>We need to build a model for each set among these M sets. That can definitely be done in parallel and there is no apparent dependency</li> <li>We now proceed to evaluating M models and again there are no dependencies among the evaluation processes</li> </ul> To add some context, <a href="http://www.schestowitz.com/MARS/modules.php?name=News&file=article&sid=16">registration is evaluated through the construction of appearance models</a>. All in all, the process in question need not be serial and it can be handled merely (not entirely) in parallel. We can further refine speeds by treating sub-sets of data (chunks) and then aggregating the results, if needed. <br><br> This would be similar to things we have done in the past, such as deploying banaries in computer clusters, invoking them via SSH, and collecting the output later. At extremity we used <a href="http://schestowitz.com/Weblog/archives/2005/02/25/a-necessary-hog/">30 units overnight</a> to produce some urgently needed results. <br><br> more

Evaluating Appearance Models of the Face

HERE are some encouraging results (shown above), which show that we can evaluate face models quite reliably. We build <a href="http://schestowitz.com/Weblog/archives/2005/02/13/appearance-models/">appearance models</a> from a set of 68 facial images and control the quality of such models by distorting the effectiveness of manual markup. We then evaluate the models using a technique described previously in the <a href="http://schestowitz.com/MARS/modules.php?name=News&file=article&sid=19">context of MR brain datasets</a>. More technical and comprehensibe reports on face models evaluation: <ul> <li>Evaluating Registration - <b>Draft</b> (<a href="/Research/Papers/2005/Evaluating_Registration_Draft/evaluating_registration.pdf">PDF</a>, <a href="/Research/Papers/2005/Evaluating_Registration_Draft/HTML">HTML</a>)</li> <li>Generic Model Evaluation Method (<a href="/Research/Papers/2005/Generic_Model/generic_model_evaluation_method.pdf">PDF</a>)</li> </ul> more


Dynamic page set up on February 25th, 2006 Maintained by Roy Schestowitz