image-js/lib/morphology/morphologicalGradient.js

Image processing and manipulation in JavaScript

import { Image } from '../Image.js';
import { subtract } from '../compare/index.js';
import { checkKernel } from '../utils/validators/checkKernel.js';
import checkProcessable from '../utils/validators/checkProcessable.js';
/**
 * In mathematical morphology and digital image processing, a morphological gradient is the difference between the dilation and the erosion of a given image. It is an image where each pixel value (typically non-negative) indicates the contrast intensity in the close neighborhood of that pixel. It is useful for edge detection and segmentation applications.
 * @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 - Morphological gradient hat options.
 * @returns The processed image.
 */
export function morphologicalGradient(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++) {
        const dilatedImage = newImage.dilate({ kernel });
        const erodedImage = newImage.erode({ kernel });
        newImage = subtract(dilatedImage, erodedImage, { absolute: true });
    }
    return newImage;
}
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