Computer vision #2 | Image acquisition, characterization and interpretation

From the moment an image is captured until some information is inferred, various subprocesses are at work. These process the image as a set of pixels to classify and interpret different groups of pixels based on certain criteria. In short, they try to “identify” which objects are contained in a given scene.

Computer vision #1 | A brief introduction to computer vision

This is the first "chapter" of what will be a small series about computer vision—a very extensive area of technological knowledge that has caught my attention. I do not plan to follow a content script, so I will decide what to publish as time goes on. I am dedicating a lot of effort and care to studying it, so I hope that, as a reader, you enjoy it, share it, and, above all, learn something new each time.

Figure 1. Real-time social distancing monitoring in COVID times
Source: deepnote.com

The origin of the so-called 'bugs'

We have all heard of bugs: errors in software that prevent or disrupt its correct behavior. But how did this term come about? There is certainly not much relation between a bug and a problem. And although for some people there is, I am referring to other types of mishaps.

Decrypt HTTPS (TLS) traffic using the SSL Key Log File | Wireshark @Windows 10

To go through the following practice, services offered by a network traffic capturer will be required. I opted for Wireshark, which can be downloaded from its official site https://www.wireshark.org/#download. It is easy to install and free to use.

An implementation for UDP & SYN Stealth (TCP) port scan | Scapy - Ubuntu 18.04

Every result obtained from the port scanning scripts will be compared to Nmap's to ensure they work correctly.

Installing Scapy software through the command $ sudo apt install python-scapy is necessary. Once installed, it can be launched by entering $ sudo scapy, although we will not use Scapy that way in this post.

'ps' system call implementation in xv6 operating system | Operating Systems - Sevilla's University

Under the pretext of a school volunteer project, I chose to dig into xv6 OS to understand how processes work in a given operating system. First, I had to download every tool needed to launch xv6 from Windows 10's command line. I also had to download xv6 itself.

Breve introducción a los sistemas DAC (Direct Air Capture)

Los sistemas Direct Air Capture (DAC) pretenden capturar el dióxido de carbono (CO2) presente en el ambiente. Actuando como una especie de filtros de aire, estos pueden almacenar el CO2 capturado para su posterior y útil uso en otras áreas, o bien inyectarlo bajo tierra; concretamente a partir de los 800 metros de profundidad, el CO2 se comprime en un material mucho más denso (que ocupa menos espacio).

Efecto de la presión en el CO2

Medidas de seguridad avanzadas en comunicaciones entre UAV y GCS basadas en MAVLink

Recientemente he llevado a cabo un esfuerzo de investigación y desarrollo acerca de cómo podrían protegerse las comunicaciones en vehículos aéreos no tripulados (UAV). Llegué a la conclusión de que un cifrado de extremo a extremo entre el UAV y su estación de control en tierra (GCS) sería una solución bastante interesante.

Modelo de comunicación cifrada extremo a extremo

CMake: cómo usar include en nuestro CMakeLists.txt

¡Solo un pequeño tip sobre cómo incluir unos archivos .cmake dentro otros!

Espero que sea de ultilidad ;).

Ejecutar comandos de Git desde un archivo CMake (git clone)

En grandes proyectos donde tengamos submódulos de Git, ¡esto puede ser interesante!

Cómo crear un proyecto básico usando CMake y C++

Os dejo una pequeña demostración de cómo configurar un proyecto básico de C++ usando CMake.

Aunque, al principio, CMake parezca muy difícil de gestionar o simplemente entender, la verdad es que cuando se clarifican algunos conceptos, se hace muy ameno e incluso se agradece el usarlo en grandes proyectos.