Adaptive Threshold in JavaScript. Both in Node.js and browser.
$ npm install adaptive-threshold
I made it as an ndarray module. So, the simplest usage is with get-pixels and save-pixels as below.
const fs = require('fs')
const savePixels = require('save-pixels')
const getPixels = require('get-pixels')
const adaptiveThreshold = require('adaptive-threshold')
getPixels('src.png', (err, pixels) => {
if (err) {
console.error(err)
return
}
let thresholded = adaptiveThreshold(pixels)
savePixels(thresholded, 'png').pipe(fs.createWriteStream('dist.png'))
})
Returns a thresholded ndarray.
pixels
- an ndarray whose shape is [width, height, channels].options.size
- the size of neighbourhood area.options.compensation
- a constant which is subtracted from the mean.