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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 | 'use client' import { useCallback, useEffect, useRef, useState } from 'react' import { QuadDetector, QuadTracker, captureVideoFrame, loadImageToCanvas, getFallbackCorners, type Corner, type QuadDetectionOptions, type QuadDetectionResult, type TrackedQuadResult, } from '@/lib/vision/quadDetection' // Re-export types for convenience export type { Corner, DetectedQuad, TrackedQuad, QuadDetectionOptions, QuadDetectionResult, TrackedQuadResult, } from '@/lib/vision/quadDetection' // Re-export utility functions export { loadImageToCanvas, captureVideoFrame, orderCorners, distance, } from '@/lib/vision/quadDetection' /** * React hook for quad detection in static images. * * Provides lazy loading of OpenCV and simple detection API. * * @example * ```tsx * function ImageScanner() { * const { isReady, detect, extract, load } = useQuadDetection() * * const handleImage = async (file: File) => { * await load() * const canvas = await loadImageToCanvas(file) * if (!canvas) return * * const result = detect(canvas) * if (result.bestQuad) { * const extracted = extract(canvas, result.bestQuad.corners) * } * } * } * ``` */ export function useQuadDetection(options?: QuadDetectionOptions) { const [isLoading, setIsLoading] = useState(false) const [isReady, setIsReady] = useState(QuadDetector.isLoaded()) const [error, setError] = useState<string | null>(null) const detectorRef = useRef<QuadDetector | null>(QuadDetector.getInstance()) const optionsRef = useRef(options) // Update options ref when they change useEffect(() => { optionsRef.current = options }, [options]) /** * Load OpenCV and initialize detector. * Safe to call multiple times - returns immediately if already loaded. */ const load = useCallback(async (): Promise<boolean> => { if (detectorRef.current) return true setIsLoading(true) setError(null) try { detectorRef.current = await QuadDetector.load() setIsReady(true) return true } catch (err) { const message = err instanceof Error ? err.message : 'Failed to load OpenCV' setError(message) console.error('QuadDetector load failed:', err) return false } finally { setIsLoading(false) } }, []) /** * Detect quads in a canvas. * Returns null if detector is not loaded. */ const detect = useCallback((canvas: HTMLCanvasElement): QuadDetectionResult | null => { if (!detectorRef.current) return null return detectorRef.current.detect(canvas, optionsRef.current) }, []) /** * Detect quads in an image file. * Automatically loads the detector if needed. */ const detectInImage = useCallback( async ( source: File | HTMLCanvasElement ): Promise<{ detected: boolean corners: Corner[] sourceCanvas: HTMLCanvasElement }> => { // Ensure loaded await load() // Get canvas let canvas: HTMLCanvasElement | null if (source instanceof File) { canvas = await loadImageToCanvas(source) } else { canvas = source } if (!canvas) { // Return fallback const fallbackCanvas = document.createElement('canvas') fallbackCanvas.width = 100 fallbackCanvas.height = 100 return { detected: false, corners: getFallbackCorners(100, 100), sourceCanvas: fallbackCanvas, } } // Detect const detector = detectorRef.current if (!detector) { return { detected: false, corners: getFallbackCorners(canvas.width, canvas.height), sourceCanvas: canvas, } } const result = detector.detect(canvas, optionsRef.current) return { detected: result.detected, corners: result.bestQuad?.corners ?? getFallbackCorners(canvas.width, canvas.height), sourceCanvas: canvas, } }, [load] ) /** * Extract a quad region using perspective transform. */ const extract = useCallback( (canvas: HTMLCanvasElement, corners: Corner[]): HTMLCanvasElement | null => { if (!detectorRef.current) return null return detectorRef.current.extract(canvas, corners) }, [] ) /** * Analyze document orientation. */ const analyzeOrientation = useCallback((canvas: HTMLCanvasElement): 0 | 90 | 180 | 270 => { if (!detectorRef.current) return 0 return detectorRef.current.analyzeOrientation(canvas) }, []) /** * Rotate a canvas. */ const rotate = useCallback( (canvas: HTMLCanvasElement, degrees: 0 | 90 | 180 | 270): HTMLCanvasElement => { if (!detectorRef.current) return canvas return detectorRef.current.rotate(canvas, degrees) }, [] ) /** * Get OpenCV reference (for advanced use). */ const getCV = useCallback(() => { return detectorRef.current?.getCV() ?? null }, []) return { /** Whether OpenCV is currently loading */ isLoading, /** Whether the detector is ready to use */ isReady, /** Error message if loading failed */ error, /** Load OpenCV (call before using detect/extract) */ load, /** Detect quads in a canvas */ detect, /** Detect quads in an image file (auto-loads) */ detectInImage, /** Extract a quad region */ extract, /** Analyze document orientation */ analyzeOrientation, /** Rotate a canvas */ rotate, /** Get OpenCV reference */ getCV, /** Get the detector instance */ detector: detectorRef.current, } } /** * React hook for quad tracking in camera feeds. * * Provides frame-to-frame tracking with stability detection. * * @example * ```tsx * function CameraScanner() { * const { isReady, processFrame, isStable, isLocked, tracker } = useQuadTracking() * const videoRef = useRef<HTMLVideoElement>(null) * const overlayRef = useRef<HTMLCanvasElement>(null) * * useEffect(() => { * if (!isReady) return * * const loop = () => { * const frame = captureVideoFrame(videoRef.current!) * if (frame && overlayRef.current) { * const result = processFrame(frame) * tracker.drawOverlay(overlayRef.current, result, frame.width, frame.height) * } * requestAnimationFrame(loop) * } * requestAnimationFrame(loop) * }, [isReady]) * } * ``` */ export function useQuadTracking(options?: QuadDetectionOptions) { const [isLoading, setIsLoading] = useState(false) const [isReady, setIsReady] = useState(false) const [error, setError] = useState<string | null>(null) const [isStable, setIsStable] = useState(false) const [isLocked, setIsLocked] = useState(false) const detectorRef = useRef<QuadDetector | null>(null) const trackerRef = useRef<QuadTracker | null>(null) const optionsRef = useRef(options) // Update options when they change useEffect(() => { optionsRef.current = options trackerRef.current?.setOptions(options ?? {}) }, [options]) /** * Load OpenCV and initialize tracker. */ const load = useCallback(async (): Promise<boolean> => { if (trackerRef.current) return true setIsLoading(true) setError(null) try { detectorRef.current = await QuadDetector.load() trackerRef.current = new QuadTracker(detectorRef.current, optionsRef.current) setIsReady(true) return true } catch (err) { const message = err instanceof Error ? err.message : 'Failed to load OpenCV' setError(message) console.error('QuadTracker load failed:', err) return false } finally { setIsLoading(false) } }, []) /** * Process a video frame and update tracking. */ const processFrame = useCallback((frame: HTMLCanvasElement): TrackedQuadResult | null => { if (!trackerRef.current) return null const result = trackerRef.current.processFrame(frame) setIsStable(result.isStable) setIsLocked(result.isLocked) return result }, []) /** * Process video element directly (convenience method). */ const processVideo = useCallback( (video: HTMLVideoElement, overlayCanvas?: HTMLCanvasElement): TrackedQuadResult | null => { const frame = captureVideoFrame(video) if (!frame) return null const result = processFrame(frame) if (overlayCanvas && result && trackerRef.current) { trackerRef.current.drawOverlay(overlayCanvas, result, video.videoWidth, video.videoHeight) } return result }, [processFrame] ) /** * Reset tracking state. */ const reset = useCallback(() => { trackerRef.current?.reset() setIsStable(false) setIsLocked(false) }, []) /** * Get current best quad corners. */ const getBestCorners = useCallback((): Corner[] | null => { return trackerRef.current?.getBestCorners() ?? null }, []) /** * Get the last stable frame. */ const getLastStableFrame = useCallback((): HTMLCanvasElement | null => { return trackerRef.current?.getLastStableFrame() ?? null }, []) /** * Get OpenCV reference. */ const getCV = useCallback(() => { return detectorRef.current?.getCV() ?? null }, []) return { /** Whether OpenCV is currently loading */ isLoading, /** Whether the tracker is ready */ isReady, /** Error message if loading failed */ error, /** Load OpenCV (call before processing frames) */ load, /** Process a canvas frame */ processFrame, /** Process video element directly */ processVideo, /** Reset tracking state */ reset, /** Whether detection is stable */ isStable, /** Whether detection is locked */ isLocked, /** Get current best corners */ getBestCorners, /** Get last stable frame */ getLastStableFrame, /** Get OpenCV reference */ getCV, /** Get detector instance */ detector: detectorRef.current, /** Get tracker instance */ tracker: trackerRef.current, } } export default useQuadDetection |