fix: format text labels as period-separated lowercase string for Grounding DINO processor

api/services/dino_service.py

@@ -21,13 +21,16 @@ class GroundingDinoService:
         Executes object detection on the PIL Image using the configured labels and thresholds.
         Returns a list of detections containing label, confidence score, and bounding boxes.
         """
-        # Format labels as expected by processor: nested list containing label strings
-        formatted_labels = [settings.TEXT_LABELS]
+        # Format labels as expected by the Grounding DINO processor:
+        # A single lowercase string containing all labels separated by periods and ending with a period.
+        text_prompt = ". ".join(settings.TEXT_LABELS).lower().strip()
+        if not text_prompt.endswith("."):
+            text_prompt += "."
         
         # Prepare inputs
         inputs = self.processor(
             images=image,
-            text=formatted_labels,
+            text=text_prompt,
             return_tensors="pt"
         ).to(self.model.device)