Alfredo Pérez’s Blog

Waterfall

I will start uploading to my gallery the pictures from Geiranger, so, pay attention.

By the way, I have realized that not many people consider the image of the right side as a link to my gallery, so I have made it more explicit and I have also changed the CSS for the selected link.

Ver mapa más grande

Due to some work requirements I needed to install LAMP (Linux Apache Mysql y Php) over Windows (some new headache).

I downloaded, installed and configured the last version of every service without problems ( no comparison with sudo apt-get install mysql-server php5-mysql ).

When I try to test if the configuration is working I write a “phpinfo.php” file with the content:
< ? phpinfo() ? >

But when I open the page http://localhost/phpinfo.php I find that it’s completely empty.

So, I started looking into the log and restarting services/os until I think about changing the test code for:

< ? php phpinfo() ? >

which happened to work properly.

The problem was that one of the configuration options of php.ini, short_open_tag (that states if the short form of the opening tag “< ?” can be used instead of the complete form “< ? php” . Until now, this value was true by default, but it has been changed to false, so that the short tag was not recognized by the php module.

The reason for this is to allow the use of other tags starting with “< ?” like ‘< ?xml’ (in fact it’s still possible to use them by < ? echo ‘< ?xml’; ? >).

The general recommendation is to use always the complete form if it is necessary to have a portable code, because it is quite probable that otherwise, in a future, trying to run the code will not work.

Biological Photography Contest 2008

21 Weeks of Biology.

 It seems I was right, using chrominance was a better way to detect a hand instead of just intensity.

Right now I’m a little bit busy with a small project for computer vision. It’s about a program that recognizes different things through the web cam, things like circles or my hand.

For example, here, the program is successfully recognizing a circle sketched in the blackboard and the rounded shape of the camera objective. However, only some times it recognizes correctly the two small circles.

And here, the program is bounding the shape of my hand. This is the first version and is not working so smoothly, but I’m sure that it will work better with a color difference than with intensity.

Last friday we could observe a Northern Light from the bridge in Trondheim. It was there for more than half an hour and we saw it from the best place in the city.

During the last week it has been quite cold here in Trondheim. We have reached -12ºC. Here is the proof.

Lytte meg: “God Påske”