document-scanner-vue/dist/utils/imageProcessing.d.ts

Vue 3 Document Scanner with OpenCV.js - Mobile optimized with camera/gallery support

import { Point, Corners } from '../types';
/**
 * Sorts corners to ensure consistent order: top-left, top-right, bottom-right, bottom-left
 * This prevents unexpected rotations/flips when user adjusts corners manually
 * @param {Point[]} corners - Array of 4 corner points in any order
 * @returns {Point[]} - Sorted corners in consistent order
 */
export declare function sortCornersForConsistentOrientation(corners: Point[]): Point[];
/**
 * Transforms corner coordinates to match a rotated image's coordinate system.
 * @param {ReadonlyArray<Point>} corners - Original corner coordinates (should be a readonly array of 4 points)
 * @param {number} rotationAngle - Rotation angle in degrees (90, 180, 270)
 * @param {number} originalWidth - Width of the original image
 * @param {number} originalHeight - Height of the original image
 * @returns {Corners | null} - Transformed corner coordinates for the rotated image as a Corners type, or null if input is invalid.
 */
export declare function transformCornersForRotation(corners: ReadonlyArray<Point>, rotationAngle: number, originalWidth: number, originalHeight: number): Corners | null;
/**
 * Transforms display corner coordinates (relative to a rotated image) back to base coordinates (relative to 0-degree image).
 * This is the inverse of transformCornersForRotation.
 * @param {ReadonlyArray<Point>} displayCorners - Corner coordinates relative to the currently rotated image view.
 * @param {number} currentRotation - The rotation angle of the current view (0, 90, 180, 270 degrees).
 * @param {number} originalWidth - Width of the original (0-degree) image.
 * @param {number} originalHeight - Height of the original (0-degree) image.
 * @returns {Corners | null} - Transformed base corner coordinates, or null if input is invalid.
 */
export declare function transformDisplayCornersToBase(displayCorners: ReadonlyArray<Point>, currentRotation: number, originalWidth: number, originalHeight: number): Corners | null;
/**
 * Calculates the area of a quadrilateral defined by four points using the Shoelace formula.
 * Assumes points are ordered (e.g., TL, TR, BR, BL).
 * @param {ReadonlyArray<Point>} points - Array of 4 corner points.
 * @returns {number} - The area of the quadrilateral.
 */
export declare function calculateAreaFromPoints(points: ReadonlyArray<Point>): number;
/**
 * Generates default square corners for an image with a specific pixel inset.
 * @param {number} imageWidth - The width of the image.
 * @param {number} imageHeight - The height of the image.
 * @param {number} insetPixels - The inset in pixels from each edge.
 * @returns {Corners} - An array of 4 Point objects representing the corners (TL, TR, BR, BL).
 */
export declare function generateDefaultCornersPx(imageWidth: number, imageHeight: number, insetPixels: number): Corners;
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