import type { BarcodeScannerFormatProfile } from './scannerFormats.js';
import './scannerNativeTypes.js';
export interface StillDecodeResult {
    readonly payload: string;
    readonly engine: 'zbar-wasm' | 'zxing' | 'native-detector';
}
/**
 * Grayscale → contrast stretch → Otsu binarization → optional 2× upscale.
 */
export declare function preprocessStillImageData(source: ImageData, upscale: boolean): ImageData;
export declare function decodeBarcodeFromImageFile(file: File, formatProfile?: BarcodeScannerFormatProfile): Promise<StillDecodeResult | null>;
export declare function decodeBarcodeFromVideoFrame(video: HTMLVideoElement, formatProfile?: BarcodeScannerFormatProfile, canvas?: HTMLCanvasElement): Promise<StillDecodeResult | null>;
//# sourceMappingURL=decodeStillImage.d.ts.map