/**
 * This module provides utility functions for analyzing image properties.
 * !IMPORTANT: Ensure ImageProcessor.initRuntime() has been called successfully
 * once before using any functions from this module.
 */
import type { Canvas } from "./index";
/**
 * Options for calculating mean Lab lightness.
 */
export interface CalculateMeanLightnessOptions {
    /** The canvas containing the image to be processed. */
    canvas: Canvas;
    /** The target dimensions for analysis (resizes internally). */
    dimension: {
        width: number;
        height: number;
    };
}
/**
 * Calculates the mean normalized lightness of an image using the L channel of the Lab color space.
 * Lightness is normalized based on the image's own maximum lightness value before averaging.
 *
 * @param options - Configuration options.
 * @returns Mean normalized lightness (0-1).
 * @throws Error if OpenCV operations fail.
 */
export declare function calculateMeanNormalizedLabLightness(options: CalculateMeanLightnessOptions): number;
/**
 * Calculates the mean pixel value of the image after converting it to grayscale.
 *
 * @param canvas - The source canvas to be processed.
 * @returns Mean grayscale value (typically 0-255).
 * @throws Error if OpenCV operations fail.
 */
export declare function calculateMeanGrayscaleValue(canvas: Canvas): number;