image-js/src/stack/utility/averageImage.js

Image processing and manipulation in JavaScript

import Image from '../../image/Image';

/**
 * @memberof Stack
 * @instance
 * @return {Image}
 */
export default function averageImage() {
  this.checkProcessable('averageImage', {
    bitDepth: [8, 16],
  });

  let data = new Uint32Array(this[0].data.length);
  for (let i = 0; i < this.length; i++) {
    let current = this[i];
    for (let j = 0; j < this[0].data.length; j++) {
      data[j] += current.data[j];
    }
  }

  let image = Image.createFrom(this[0]);
  let newData = image.data;

  for (let i = 0; i < this[0].data.length; i++) {
    newData[i] = data[i] / this.length;
  }

  return image;
}