voluptasquisquam/src/image/filter/blurFilter.js

Image processing and manipulation in JavaScript

import convolutionFft from '../operator/convolutionFft';

/**
 * Apply a filter to blur the image
 * @memberof Image
 * @instance
 * @param {object} options
 * @param {number} [options.radius=1] : number of pixels around the current pixel to average
 * @return {Image}
 */
// first release of mean filter
export default function blurFilter(options = {}) {
    let {radius = 1} = options;
    this.checkProcessable('meanFilter', {
        components: [1],
        bitDepth: [8, 16]
    });

    if (radius < 1) {
        throw new Error('Number of neighbors should be grater than 0');
    }

    let n = 2 * radius + 1;
    let size = n * n;
    let kernel = new Array(size);

    for (let i = 0; i < kernel.length; i++) {
        kernel[i] = 1;
    }

    return convolutionFft.call(this, kernel);
}