image-js/lib/featureMatching/keypoints/getIntensityCentroid.js

Image processing and manipulation in JavaScript

import { getIntensityMoment } from './getIntensityMoment.js';
/**
 * Compute the intensity centroid of an image for each channel relatively to the center of the image.
 * Original article: {@link https://doi.org/10.1006/cviu.1998.0719}.
 * @see {@link https://en.wikipedia.org/wiki/Image_moment}
 * @param image - Image to process.
 * @returns The intensity centroid of each channel of the image.
 */
export function getIntensityCentroid(image) {
    const moment10 = getIntensityMoment(image, 1, 0);
    const moment01 = getIntensityMoment(image, 0, 1);
    const moment00 = getIntensityMoment(image, 0, 0);
    const centroid = [];
    for (let channel = 0; channel < image.channels; channel++) {
        if (moment00[channel] === 0) {
            centroid.push({
                column: 0,
                row: 0,
            });
        }
        else {
            centroid.push({
                column: moment10[channel] / moment00[channel],
                row: moment01[channel] / moment00[channel],
            });
        }
    }
    return centroid;
}
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