Last day I wrote an article about converting images to line-drawings using Python and OpenCV.
https://blog.pyrospect.com/2019/01/how-to-convert-photo-images-to.html
I like Python as a programming language and I believe OpenCV matches best with Python, though the main language for my personal projects is Javascript, I was looking for a way to do the same thing using Javascript and Node.js.
First I've tried OpenCV.js, the officially supported Javascript bindings for OpenCV,
but somehow it didn't work on my machine.
https://docs.opencv.org/3.4.5/d5/d10/tutorial_js_root.html
I found other image processing libraries not using OpenCV, and they looked useful for other purposes, but for the purpose this time, it seemed using OpenCV is the best.
https://github.com/oliver-moran/jimp
https://github.com/lovell/sharp
http://aheckmann.github.io/gm/
I finally chose "opencv4nodejs", a Node.js module that works as Javascript binding for OpenCV alternative. And this worked perfectly well.
https://www.npmjs.com/package/opencv4nodejs
This library provides OpenCV functions as Javascript functions with more Object Oriented style to make it easy to use in Javascript programs.
Here is the source code for Node.js, which I rewrote from my Python program in the article above:
The "opencv4nodejs" module downloads OpenCV when installing from NPM, so you don't have to install Python and OpenCV.
npm install --save opencv4nodejs
