import type { Image } from '../Image.js';
import type { Point } from '../geometry/index.js';
export interface VarianceOptions {
    /**
     * Points to calculate variance from.
     */
    points: Point[];
}
/**
 * Compute the variance of each channel of an image.
 * @see {@link https://en.wikipedia.org/wiki/Variance}
 * @param image - Image to process.
 * @param options - Variance options.
 * @returns The variance of the channels of the image.
 */
export declare function variance(image: Image, options?: VarianceOptions): number[];
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