http://pmeerw.dyndns.org/blog/index.atom Peter Meerwald http://pmeerw.dyndns.org/blog/index.atom pmeerw@pmeerw.net Copyright 2007-2009 Peter Meerwald PyBlosxom http://pyblosxom.sourceforge.net/ 1.4.3 01/10/2008 2009-11-01T20:26:10Z http://pmeerw.dyndns.org/blog/2009/11/01/mobilecam-wm 2009-11-01T20:26:10Z 2009-11-01T20:26:10Z <p> Experimental setup: <ul> <li>A watermark is embedded in a 480x272 color image (at approx. 43 dB PSNR) with no preceptual distortion. <li>The image is displayed with 2x scale-up factor on a TFT display. <li>The screen is photographed with two cameras: a Canon IXUS70 (roughly 7.1 MP) and a Nokia 6300i (2 MP) mobile phone. <li>The target images are manually registered (cropped, rotated, scaled) without holding on to accurate affine distortion compensation. No 'trapeze adjustment' has been performed (don't know how to do that with Gimp <img class="smiley" src="/images/smileys/happy.gif" alt=":-)" />. <li>Presence of the watermark can be easily detected in the registered image while guaranteeing a low probability of false-positive detection (Pfp = 1e-6). </ul> </p> Here are the test images (click on the thumbnails for full-size images): <p> <table border="1"> <thead> <tr> <th colspan="2">Canon IXUS70</th> <th colspan="2">Nokia 6300i</th> </tr> <tr> <td>Captured<br>3072x2304</td> <td>Registered<br>480x272</td> <td>Captured<br>1600x1200</td> <td>Registered<br>480x272</td> </tr> </thead> <tbody> </tr> <tr> <td><a href="/blog/images/IMG_3725.JPG"><img src="/blog/images/sIMG_3725.JPG"></a><br>IMG_3725.JPG</td> <td><a href="/blog/images/rIMG_3725.png"><img src="/blog/images/srIMG_3725.jpg"></a><br>rIMG_3725.png</td> <td><a href="/blog/images/Image0007.jpg"><img src="/blog/images/sImage0007.jpg"></a><br>Image0007.jpg</td> <td><a href="/blog/images/rImage0007.png"><img src="/blog/images/srImage0007.jpg"></a><br>rImage0007.png</td> </tr> <tr> <td><a href="/blog/images/IMG_3727.JPG"><img src="/blog/images/sIMG_3727.JPG"></a><br>IMG_3727.JPG</td> <td><a href="/blog/images/rIMG_3727.png"><img src="/blog/images/srIMG_3727.jpg"></a><br>rIMG_3727.png</td> <td><a href="/blog/images/Image0008.jpg"><img src="/blog/images/sImage0008.jpg"></a><br>Image0008.jpg</td> <td><a href="/blog/images/rImage0008.png"><img src="/blog/images/srImage0008.jpg"></a><br>rImage0008.png</td> </tr> <tr> <td><a href="/blog/images/IMG_3728.JPG"><img src="/blog/images/sIMG_3728.JPG"></a><br>IMG_3728.JPG</td> <td><a href="/blog/images/rIMG_3728.png"><img src="/blog/images/srIMG_3728.jpg"></a><br>rIMG_3728.png</td> <td><a href="/blog/images/Image0009.jpg"><img src="/blog/images/sImage0009.jpg"></a><br>Image0009.jpg</td> <td><a href="/blog/images/rImage0009.png"><img src="/blog/images/srImage0009.jpg"></a><br>rImage0009.png</td> </tr> </tbody> </table> </p> http://pmeerw.dyndns.org/blog/2009/10/19/holux_m241 2009-10-19T11:46:27Z 2009-10-19T11:46:27Z <p> Got a <a href="http://www.holux.com/JCore/en/products/products_content.jsp?pno=341">Holux M-241</a> GPS logger. Now the software stack is missing, or isn't it? </p> http://pmeerw.dyndns.org/blog/2009/10/19/nexys2 2009-10-19T11:31:12Z 2009-10-19T11:31:12Z <p> Got <a href="http://digilentinc.com/Products/Detail.cfm?NavPath=2,400,789&Prod=NEXYS2">nexys2</a> FPGA board from <a href="http://www.digilentinc.com">Digilent</a> (under their academic program). Let's see if I get it to work (with Linux)... </p> http://pmeerw.dyndns.org/blog/2009/10/18/twitterenh 2009-10-18T12:08:09Z 2009-10-18T12:08:09Z <p> My blog is now <a href="http://twitter.com">twitter</a>-enhanced and shows my latest five <a href="http://twitter.com/pmeerw">tweets</a>. </p> <p> Thanks to <a href="http://myopicvoid.org/">Devon Meunier</a> for <a href="http://github.com/meunierd/meunierd-uoft/blob/master/pybltwitter/pybltwitter.py">pybltwitter.py</a>! </p> http://pmeerw.dyndns.org/blog/2009/10/12/wmblog 2009-10-12T14:24:04Z 2009-10-12T14:24:04Z <p> ... <a href="http://watermaskedcucumbers.blogspot.com/">The Watermasked Cucumbers and their watermarking blog</a>! </p> <p> I wonder who is blogging there :) well, not too much </p>