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sed, -Rni, pgrep, -a, -f, -i

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, G++, -j, nproc

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..

Series: Lucid Multi-Camera Synchronization — Part 1 of 3Mode 1: Hardware Trigger Only (No PTP)This post explains Trigger-only multi-camera capture using lucid_sync_trigger_only.py with Lucid GigE cameras and the Arena SDK on Linux. All cameras expose on the same electrical trigger pulse; PTP is not used.Script: lucid_sync_trigger_only.py in GitHub1. Concept — What is “trigger only”?In trigger-on..