Add embedding model selection and comparison test scripts

- Update DetectLogosDETR to support both CLIP and DINOv2 models
  - Rename clip_model parameter to embedding_model
  - Add model type detection for different embedding extraction
  - DINOv2 uses CLS token, CLIP uses get_image_features()
- Add -e/--embedding-model argument to test_logo_detection.py
- Include model name in file output header
- Add run_threshold_tests.sh for testing various threshold/margin values
- Add run_model_comparison.sh for comparing CLIP vs DINOv2 models

test_logo_detection.py

@@ -203,6 +203,13 @@ def main():
         default=0.5,
         help="DETR detection confidence threshold (default: 0.5)",
     )
+    parser.add_argument(
+        "-e", "--embedding-model",
+        type=str,
+        default="openai/clip-vit-large-patch14",
+        help="Embedding model for feature extraction (default: openai/clip-vit-large-patch14). "
+             "Supports CLIP models (openai/clip-*) and DINOv2 models (facebook/dinov2-*)",
+    )
     parser.add_argument(
         "-s", "--seed",
         type=int,
@@ -302,10 +309,11 @@ def main():
         logger.info(f"Loaded {len(cache)} cached embeddings")
 
     # Initialize detector
-    logger.info("Initializing logo detector...")
+    logger.info(f"Initializing logo detector with embedding model: {args.embedding_model}")
     detector = DetectLogosDETR(
         logger=logger,
         detr_threshold=args.detr_threshold,
+        embedding_model=args.embedding_model,
     )
 
     # Load ground truth (both mappings)
@@ -633,18 +641,20 @@ def write_results_to_file(
     lines = [
         "=" * 70,
         f"TEST: {args.matching_method.upper()} MATCHING",
+        f"Model: {args.embedding_model}",
         f"Method: {method_desc}",
         "=" * 70,
         f"Date: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}",
         "",
         "Configuration:",
+        f"  Embedding model:           {args.embedding_model}",
         f"  Reference logos:           {num_logos}",
         f"  Refs per logo:             {args.refs_per_logo}",
         f"  Total reference embeddings:{total_refs}",
         f"  Positive samples/logo:     {args.positive_samples}",
         f"  Negative samples/logo:     {args.negative_samples}",
         f"  Test images processed:     {num_test_images}",
-        f"  CLIP threshold:            {args.threshold}",
+        f"  Similarity threshold:      {args.threshold}",
         f"  DETR threshold:            {args.detr_threshold}",
     ]