import { CBARProcessNode } from "./CBARProcessNode";
import { CBARFrame } from "../CBARFrame";
import { Point } from "mirada";
import { CBARPipeline } from "./CBARPipeline";
import * as gm from "gammacv";
declare type OpticalFlowPoint = {
    point: Point;
    frameTime: number;
    frameIndex: number;
};
export declare class OpticalFlowFeature {
    private _currentPosition;
    cluster?: OpticalFlowCluster | undefined;
    constructor(_currentPosition: OpticalFlowPoint, cluster?: OpticalFlowCluster | undefined);
    readonly id: number;
    status?: number;
    error?: number;
    verified: number;
    private _previousPosition?;
    get currentPosition(): Point;
    get previousPosition(): Point | undefined;
    get direction(): {
        x: number;
        y: number;
    } | undefined;
    update(point: OpticalFlowPoint): void;
}
export declare class OpticalFlowCluster {
    roi: gm.Rect;
    qualityLevel: number;
    minFeatures: number;
    constructor(roi: gm.Rect, qualityLevel: number, minFeatures?: number);
    readonly id: number;
    features: OpticalFlowFeature[];
}
export declare type OpticalFlowResult = {
    points: OpticalFlowFeature[];
    removed: OpticalFlowFeature[];
};
export declare type OpticalFlowConfig = {
    maxPoints: number;
    qualityLevel: number;
    minDistance: number;
    windowSize: number;
    updateFrequency: number;
    findNewFrequency: number;
    cleanupFrequency: number;
};
export declare class CBAROpticalFlowNode extends CBARProcessNode {
    private _prevFrame?;
    private _features;
    private _clusters;
    private _gotLastFeaturesIndex;
    constructor(context: CBARPipeline, _config?: OpticalFlowConfig);
    config: OpticalFlowConfig;
    trackRegion(cluster: OpticalFlowCluster): OpticalFlowCluster;
    untrackRegion(cluster: OpticalFlowCluster): void;
    get trackedRegions(): OpticalFlowCluster[];
    private getNewFeatures;
    private status;
    private err;
    private prevPoints;
    private nextPoints;
    private updateFeatures;
    private cleanupFeatures;
    get features(): OpticalFlowFeature[];
    private _needsCleanup;
    update(frame: CBARFrame): void;
    debug(canvas: HTMLCanvasElement): void;
    destroy(): void;
}
export {};