¡Hola, Mundo!

Pixel, Resolution, PPI (Pixels Per Inch), DPI (Dots Per Inch)

Pixel The pictures on the computers are represented by dots. The fundamental unit of anything you see on any computer is the DOT, refers to them as pixels or PEL. So everything you see boils down to a dot or a collection of dots.Resolution For a given image, the number of dots horizontally versus the number of cots vertically.DPI (Dots Per Inch) When printing an image, pixels are converted into..

sed Stream Editor.Instead of opening a file manually in a visual text editor (like nano or vim), sed accepts an input stream (a text file or output piped from another command), processes it line-by-line according to specified rules, and outputs the result. For example,sed -n '1,100p' file -n : don't automatically print every line'1,100p' = print (p) lines 1 through 100-Rni -R Recursive-n Show..

GCC GCC stands for GNU Compiler Collection. It is a collection of compilers commonly used on Linux.GNU and Linux are not the same thing, but they work together to create a complete operating system. G++ It is the GNU C++ Compiler, which is a widely used, open-source compiler tool invoked via the command-line to translate C++ source code into executable programs or libraries. It is part of the G..

-type f f : a regular file-type f ↑ file For example,find . -type f return:./Main.cpp./CMakeLists.txt./Settings/FocalLength.txt-type d d : directory For example,find . -type d return:../Settings./Utils./Data./build| This is called a pipe. It takes the output of the command on the left and passes it as input to the command on the right:command A | command B │ ↑ └───────..

Why do we need Bundle Adjustment? \(P =\begin{bmatrix}X \\Y \\Z\end{bmatrix}\),- A camera observes that corner at an image location:\(p_{\mathrm{observed}} =\begin{bmatrix}u \\v\end{bmatrix}\),- Given the camera intrinsics and the estimated relative pose between the camera and board, we can mathematically project the 3D point into the image:\(P_{3D}\rightarrow\mathrm{Transform}\rightarrow\mathrm..