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I have posted a couple of programs over at the Gambas One forum. Both are in support of answers I've given at DSP.stackexchange.
The first let's you measure angles of edges quite accurately in an image.
https://forum.gambas.one/viewtopic.php?f=4&t=707
https://dsp.stackexchange.com/questions/58226/auto-detection-of-rotation-angle-on-arbitrary-image-with-orthogonal-features
The second is intended to find the areas of a photo that are in focus, but the main takeaway is the ability to turn a photo into what appears to be a drawing.
https://forum.gambas.one/viewtopic.php?f=4&t=711
https://dsp.stackexchange.com/questions/58341/after-advice-about-detecting-focus-quality-of-objects-in-a-photo-detected-using
You don't need to install Gambas to look at the code. The source files are plain text and located in a hidden directory called ".src". You do need to install it to run the programs. (PPA: gambas-team/gambas3) It is open source, this message ain't spam, it's a favor to you.
Ced
Do you advise me to use YoloV3?
I'm an experienced programmer and a mathematician, so I like to do things my own way. I've "reinvented many wheels", "improved many wheels", and used others' "wheels". Which to do depends on circumstances and "the cost" of using pre-existing "wheels".
For rapid desktop application development in Linux, I can whole-heartedly recommend Gambas. It's open source. The downside is that it isn't that widely used, nor cross-platform. Since it is a BASIC dialect, it is quite easy to learn, yet it is very very rich. Rich enough that it is my preferred platform. I can always write a C shared library and call it easily if needed.