image-js/lib/featureMatching/utils/compareIntensity.js

Image processing and manipulation in JavaScript

import { sum } from '../../utils/geometry/points.js';
/**
 * Compare the intensity of two pixels of a GREY image.
 * @param image - Source image of the pixels.
 * @param p1 - First point.
 * @param p2 - Second point.
 * @param options - Options.
 * @returns Wether p1 is darker that p2.
 */
export function compareIntensity(image, p1, p2, options = {}) {
    const { origin = image.getCoordinates('center') } = options;
    const absoluteP1 = sum(p1, origin);
    const absoluteP2 = sum(p2, origin);
    const intensity1 = image.getValueByPoint(absoluteP1, 0);
    const intensity2 = image.getValueByPoint(absoluteP2, 0);
    return intensity1 < intensity2;
}
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