image-js/lib/operations/getMaskFromCannyEdge.js

Image processing and manipulation in JavaScript

import { fromMask } from '../roi/index.js';
/**
 * Creates a mask with ROI shapes with CannyEdge filter. Then these shapes
 * get "filled" through internalIds.
 * @param image - Image to get the mask with.
 * @param options - GetMaskFromCannyEdge options.
 * @returns Mask
 */
export function getMaskFromCannyEdge(image, options) {
    const kernel = options?.kernel ?? [
        [1, 1, 1],
        [1, 1, 1],
        [1, 1, 1],
    ];
    const iterations = options?.iterations ?? 1;
    let mask = image.cannyEdgeDetector();
    mask = mask.dilate({ iterations, kernel });
    const roiMap = fromMask(mask);
    const rois = roiMap.getRois({ kind: 'white' });
    for (const roi of rois) {
        const ids = new Set(roi.internalIDs.filter((value) => {
            return value < 0;
        }));
        for (let i = roi.origin.row; i < roi.origin.row + roi.height; i++) {
            for (let j = roi.origin.column; j < roi.origin.column + roi.width; j++) {
                const value = roi.getMapValue(j, i);
                if (ids.has(value)) {
                    mask.setBit(j, i, 1);
                }
            }
        }
    }
    return mask;
}
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