image-js/lib/morphology/close.js

Image processing and manipulation in JavaScript

import { Image } from '../Image.js';
import { checkKernel } from '../utils/validators/checkKernel.js';
import checkProcessable from '../utils/validators/checkProcessable.js';
/**
 * In mathematical morphology, the closing of a set A by a structuring element B is the erosion of the dilation of that set (Wikipedia).
 * In image processing, closing is, together with opening, the basic workhorse of morphological noise removal.
 * Opening removes small objects, while closing removes small holes.
 * @see {@link http://docs.opencv.org/2.4/doc/tutorials/imgproc/opening_closing_hats/opening_closing_hats.html}
 * @param image - Image to process.
 * @param options - Close options.
 * @returns Closed image.
 */
export function close(image, options = {}) {
    const { kernel = [
        [1, 1, 1],
        [1, 1, 1],
        [1, 1, 1],
    ], iterations = 1, } = options;
    if (image instanceof Image) {
        checkProcessable(image, {
            bitDepth: [1, 8, 16],
            components: 1,
            alpha: false,
        });
    }
    checkKernel(kernel);
    let newImage = image;
    for (let i = 0; i < iterations; i++) {
        newImage = newImage.dilate({ kernel }).erode({ kernel });
    }
    return newImage;
}
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