image-js/lib/image/operator/convolutionSeparable.js

Image processing and manipulation in JavaScript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = convolutionSeparable;
var _mlConvolution = require("ml-convolution");
function convolutionSeparable(data, separatedKernel, width, height) {
  const result = new Array(data.length);
  let tmp, conv, offset, kernel;
  kernel = separatedKernel[1];
  offset = (kernel.length - 1) / 2;
  conv = new Array(width + kernel.length - 1);
  tmp = new Array(width);
  for (let y = 0; y < height; y++) {
    for (let x = 0; x < width; x++) {
      tmp[x] = data[y * width + x];
    }
    (0, _mlConvolution.directConvolution)(tmp, kernel, conv);
    for (let x = 0; x < width; x++) {
      result[y * width + x] = conv[offset + x];
    }
  }
  kernel = separatedKernel[0];
  offset = (kernel.length - 1) / 2;
  conv = new Array(height + kernel.length - 1);
  tmp = new Array(height);
  for (let x = 0; x < width; x++) {
    for (let y = 0; y < height; y++) {
      tmp[y] = result[y * width + x];
    }
    (0, _mlConvolution.directConvolution)(tmp, kernel, conv);
    for (let y = 0; y < height; y++) {
      result[y * width + x] = conv[offset + y];
    }
  }
  return result;
}