import { S as SsimOptions } from './types-ClU9XBY2.js';

/**
 * SSIM (Structural Similarity Index) with automatic downsampling
 *
 * Reference:
 * Z. Wang, A. C. Bovik, H. R. Sheikh, and E. P. Simoncelli,
 * "Image quality assessment: From error visibility to structural similarity,"
 * IEEE Transactions on Image Processing, vol. 13, no. 4, pp. 600-612, Apr. 2004.
 *
 * This implementation matches the MATLAB ssim.m reference implementation.
 */

/**
 * SSIM options
 */
interface SsimOptionsExtended extends SsimOptions {
    /** Dynamic range of the images (default: 255) */
    L?: number;
}
/**
 * Compute SSIM between two images with automatic downsampling
 *
 * @param image1 - First image data (RGBA format, 4 bytes per pixel)
 * @param image2 - Second image data (RGBA format, 4 bytes per pixel)
 * @param output - Optional output buffer for SSIM map visualization (RGBA format)
 * @param width - Image width in pixels
 * @param height - Image height in pixels
 * @param options - SSIM computation options
 * @returns SSIM score (0-1, where 1 is identical)
 *
 * @example
 * ```typescript
 * // Basic usage
 * const score = ssim(img1, img2, undefined, width, height);
 *
 * // With SSIM map output
 * const output = new Uint8ClampedArray(width * height * 4);
 * const score = ssim(img1, img2, output, width, height);
 * ```
 */
declare function ssim(image1: Uint8ClampedArray | Uint8Array | Buffer, image2: Uint8ClampedArray | Uint8Array | Buffer, output: Uint8ClampedArray | Uint8Array | Buffer | undefined, width: number, height: number, options?: SsimOptionsExtended): number;

export { type SsimOptionsExtended, ssim as default, ssim };