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john-okeefe
ffaceaf962
Implement a comprehensive panel detection system for manga and comics with automatic fallback chain for maximum compatibility. Core detector (detector.js): - PanelDetector class with in-memory caching - Lazy-loading of OpenCV and TensorFlow.js - Validation logic to filter poor detections - Cache management to avoid re-detection OpenCV edge detection (opencv.js): - Canny edge detection for panel boundaries - Contour finding with bounding box extraction - Size and aspect ratio filtering - Reading order sorting (top-to-bottom, left-to-right) ML-based detection (coco-ssd.js): - COCO-SSD pre-trained model integration - Object detection for irregular panel layouts - Rectangular filtering for panel-like regions - Handles edge cases where edge detection fails Grid-based fallback (grid.js): - Lightweight 3x3 grid detection - Empty cell detection via alpha channel analysis - Adjacent panel merging algorithm - Always works as final fallback The detection pipeline tries OpenCV first (fast, accurate), falls back to ML detection if validation fails, and uses grid detection as ultimate baseline.