image-js/lib/stack/compute/sum.js

Image processing and manipulation in JavaScript

import { Image } from '../../Image.js';
import { checkProcessable } from '../utils/checkProcessable.js';
/**
 *  Returns a new 16 bits depth image with the sum of each pixel of the images of the stack.
 * @param stack - Stack to process.
 * @returns The sum image.
 */
export function sum(stack) {
    checkProcessable(stack, { sameDimensions: true, bitDepth: 8 });
    // Because 255*257 = 2**16 - 1
    if (stack.size > 257) {
        throw new Error('Maximal valid stack size is 257');
    }
    const image = stack.getImage(0);
    const dataSize = image.size * stack.channels;
    const sum = new Uint16Array(dataSize).fill(0);
    for (let i = 0; i < stack.size; i++) {
        for (let j = 0; j < image.size; j++) {
            for (let channel = 0; channel < stack.channels; channel++) {
                sum[j * stack.channels + channel] += stack.getValueByIndex(i, j, channel);
            }
        }
    }
    return new Image(image.width, image.height, {
        data: sum,
        colorModel: stack.colorModel,
        bitDepth: 16,
    });
}
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