Blogs de Ciência

I recorded some videos more to my mastering qualify (the alphabet in Libras - Brazilian Sign Language).I'm having problems with the Scilab (it doesn't read the videos), thus I used the mplayer to extract the frames. For extract frames from a video, I use the command:>> mplayer -vo jpeg name_of_the_file.aviNow, I'm doing tests about skin segmentation. I tried threshold and clustering algorithms, but nothing works with all pictures that I have.If anyone can helps me, I will be very grateful.These are some pictures that I have:Letter 'A':Letter 'E':Letter 'I':Letter 'O':Letter 'U':

I was told that I have 1 month to complete my mastering qualification.Thus, I can't make posts frequently until the next month.But, I want to thank to readers who visited the MultiSign (yesterday I had 37 visits, see here). I'm very happy too because I saw the first place with more than 10 visits out of Brazil and Portugual, look the picture.See the west of United States (the left side).So, it's all.

Games, or any entertainment aplication, ever are questioned in Free Software, because when someone is talking about GNU/Linux and others free systems other one be the question: "I will can play the game {X}??". So is necessary to cite the incompatibilities between the systems (GNU/Linux and Window$, for example). Sometimes the emulators (as the wine) can resolves the problem, but the games are a big problem to use free software, for domestic users.Currently exists many free games, or compatible with free enviroments, that are very interesting, for example:Nexuiz;Super Tux (similar to Super Mario of SNES);America's Army;Open Arena;Tremolous;Tux Racer;Alien Arena;The Open Racing Car Simulator;Frets On Fire;Scorched 3D;Mania Drive;FreeCraft;Cube.List with many games here.I believe that money is the biggest complicating for free game developers. But I find some answers to this question:Publicity - a company can pay to the developers and the game could have advertisements of that, for example a car company (Ferrari, GM, Toyota, etc...) paid for a racer game, and all cars will be of this company."Closed" games - the game is free, so the source-code just together the program, but is possible to develop specific ...

In this post I will share knowledge about Scilab and SIVP (Scilab Image and Video Processing toolbox).To Ubuntu (and similars) users the Scilab can be downloaded and installed by package manager (synapic, apt-get, adept, ......), you just to download all files. The SIVP can be downloaded from here.To install the SIVP is very simple, only do this steps as root:Unpack the file;In shell: cd {SIVP's directory}In shell: ./configureIn shell: makeIn shell: make installAfter this proceeding, the Scilab is all set to use computational vision resources: webcam's access, files (images and videos) readers, image display, ......The SIVP uses the OpenCV API, and it can be downloaded and installed by package manager.Before of start the Scilab, test your webcam with the Camorama (it can be downloaded and installed by package manager too).This is the initial Scilab's screen:The toolboxes button is detached.To load the SIVP is only select it in toolboxes button.This code is a example to use the webcam and display the images.// Display images from webcamCam = camopen(); // open the webcam...

This is my first post in english. I like the Scilab, so it's the subject of this post.The Scilab is a simulation enviroment to numeric computation, i. e., the Scilab have many resources to solve complicated problems.Examples of aplications that I work in Scilab:Neural networks;Genetics Algorithms;Analysis os temporal series (in economy);Digital images and signals processing;Computational vision;Electromagnetism.The most important work that I developed was a new algorithm to detect and localize critical points in digital images, I have used details enhacement in this work and the classical technics uses boundary analysis.The Scilab has many toolboxes, for example: SIVP - Scilab Image and Video Processing toolbox and SWT - Scilab Wavelets Toolbox (this have functions for signals and images). The Scicos is a graphical simulation enviroment, this is on the Scilab (called by "scicos" in prompt), with the Scicos is possible to develop "getting blocks", this is a easy and fast mode to work.To finish, the Scilab is a free software and doesn't have less resources than proprietary softwares.