/**
 * Utility functions for image processing
 */
import { Box, Point } from '../types/types';
type DownscaleInput = HTMLImageElement | HTMLVideoElement | HTMLCanvasElement;
export declare class ImageUtils {
    /**
     * Crops a face from an image based on the bounding box
     * @returns An object containing the cropped canvas and the top-left offset used
     */
    static cropFace(canvas: HTMLCanvasElement, box: Box, margin?: number): {
        croppedCanvas: HTMLCanvasElement;
        offsetX: number;
        offsetY: number;
    };
    /**
     * Draws facial landmarks on a canvas
     */
    static drawLandmarks(canvas: HTMLCanvasElement, points: Point[], color?: string, size?: number): void;
    /**
     * Draws a bounding box on a canvas
     */
    static drawBox(canvas: HTMLCanvasElement, box: Box, color?: string, lineWidth?: number): void;
    /**
     * Converts an image or video to canvas
     */
    static elementToCanvas(element: HTMLImageElement | HTMLVideoElement | HTMLCanvasElement): HTMLCanvasElement;
    /**
     * Downscales an image element to a target width, maintaining aspect ratio.
     * Only works in browser environments.
     * @param element The input image, video, or canvas.
     * @param targetWidth The desired width for the downscaled image.
     * @returns Object containing the downscaled canvas and the scaling factor used.
     */
    static downscaleImage(element: DownscaleInput, targetWidth: number): {
        downscaledCanvas: HTMLCanvasElement;
        scaleFactor: number;
    };
}
export {};