/**
 * Implementation of Viola-Jones classifier
 *
 * Copyright (C) 2014 Ivar Clemens
 */
import { Image } from '../core/Image';
import { CascadeInterface } from './Cascade';
import { IntegralImage } from './IntegralImage';
/**
 * Suggests the scales at which the HaarClassifier should run
 */
export declare function GetHaarScales(cascade: CascadeInterface, imageOrWidth: Image | number, height?: number, scaleUpdate?: number): number[];
/**
 * Caches some parameters that are affected by scale
 */
export interface HaarCascadeCache {
    scale: number;
    width: number;
    height: number;
    invArea: number;
}
/**
 * Implements the haar classifier
 */
export declare class HaarClassifier {
    private _integralImage;
    private _cascade;
    private _stages;
    private _scale;
    private _cache;
    readonly integralImage: IntegralImage;
    readonly cache: HaarCascadeCache;
    readonly width: number;
    readonly height: number;
    scale: number;
    /**
     * Create new cascade, optionally specifying a scale factor
     */
    constructor(cascade: CascadeInterface, scale?: number);
    setImage(image: Image): void;
    detectObject(minX?: number, maxX?: number, minY?: number, maxY?: number, stepX?: number, stepY?: number): number[][];
    /**
     * Updated cached values after the scale factor changes.
     */
    private updateCache();
}