Move post processing to separate utility

frigate/detectors/plugins/onnx.py

@@ -1,6 +1,5 @@
 import logging
 
-import cv2
 import numpy as np
 from pydantic import Field
 from typing_extensions import Literal
@@ -10,7 +9,7 @@ from frigate.detectors.detector_config import (
     BaseDetectorConfig,
     ModelTypeEnum,
 )
-from frigate.util.model import get_ort_providers
+from frigate.util.model import get_ort_providers, post_process_yolov9
 
 logger = logging.getLogger(__name__)
 
@@ -81,39 +80,8 @@ class ONNXDetector(DetectionApi):
                 ]
             return detections
         elif self.onnx_model_type == ModelTypeEnum.yolov9:
-            # see https://github.com/MultimediaTechLab/YOLO/blob/main/yolo/utils/bounding_box_utils.py#L338
             predictions: np.ndarray = tensor_output[0]
-            predictions = np.squeeze(predictions).T
-            scores = np.max(predictions[:, 4:], axis=1)
-            predictions = predictions[scores > 0.4, :]
-            scores = scores[scores > 0.4]
-            class_ids = np.argmax(predictions[:, 4:], axis=1)
-
-            # Rescale box
-            boxes = predictions[:, :4]
-
-            input_shape = np.array([self.w, self.h, self.w, self.h])
-            boxes = np.divide(boxes, input_shape, dtype=np.float32)
-            indices = cv2.dnn.NMSBoxes(
-                boxes, scores, score_threshold=0.4, nms_threshold=0.4
-            )
-            detections = np.zeros((20, 6), np.float32)
-            for i, (bbox, confidence, class_id) in enumerate(
-                zip(boxes[indices], scores[indices], class_ids[indices])
-            ):
-                if i == 20:
-                    break
-
-                detections[i] = [
-                    class_id,
-                    confidence,
-                    bbox[1] - bbox[3] / 2,
-                    bbox[0] - bbox[2] / 2,
-                    bbox[1] + bbox[3] / 2,
-                    bbox[0] + bbox[2] / 2,
-                ]
-
-            return detections
+            return post_process_yolov9(predictions, self.w, self.h)
         else:
             raise Exception(
                 f"{self.onnx_model_type} is currently not supported for rocm. See the docs for more info on supported models."

frigate/util/model.py

@@ -4,6 +4,8 @@ import logging
 import os
 from typing import Any
 
+import cv2
+import numpy as np
 import onnxruntime as ort
 
 try:
@@ -14,6 +16,43 @@ except ImportError:
 
 logger = logging.getLogger(__name__)
 
+### Post Processing
+
+
+def post_process_yolov9(predictions: np.ndarray, width, height) -> np.ndarray:
+    predictions = np.squeeze(predictions).T
+    scores = np.max(predictions[:, 4:], axis=1)
+    predictions = predictions[scores > 0.4, :]
+    scores = scores[scores > 0.4]
+    class_ids = np.argmax(predictions[:, 4:], axis=1)
+
+    # Rescale box
+    boxes = predictions[:, :4]
+
+    input_shape = np.array([width, height, width, height])
+    boxes = np.divide(boxes, input_shape, dtype=np.float32)
+    indices = cv2.dnn.NMSBoxes(boxes, scores, score_threshold=0.4, nms_threshold=0.4)
+    detections = np.zeros((20, 6), np.float32)
+    for i, (bbox, confidence, class_id) in enumerate(
+        zip(boxes[indices], scores[indices], class_ids[indices])
+    ):
+        if i == 20:
+            break
+
+        detections[i] = [
+            class_id,
+            confidence,
+            bbox[1] - bbox[3] / 2,
+            bbox[0] - bbox[2] / 2,
+            bbox[1] + bbox[3] / 2,
+            bbox[0] + bbox[2] / 2,
+        ]
+
+    return detections
+
+
+### ONNX Utilities
+
 
 def get_ort_providers(
     force_cpu: bool = False, device: str = "AUTO", requires_fp16: bool = False