update the codebase poc ver1

workspace/sprint_1_2/CODEBASE/infra/tests/test_1_model.py

@@ -28,6 +28,17 @@ def preprocess_224(img: Image.Image) -> np.ndarray:
     arr = np.expand_dims(arr, axis=0)  # Add batch dim -> NCHW
     return arr
 
+def preprocess_512(img: Image.Image) -> np.ndarray:
+    """Preprocesses image to NCHW FP32 [1, 3, 512, 512] matching ResNet50 input requirements"""
+    img_resized = img.resize((512, 512), Image.Resampling.BILINEAR)
+    arr = np.asarray(img_resized).astype(np.float32) / 255.0
+    mean = np.array([0.485, 0.456, 0.406], dtype=np.float32)
+    std = np.array([0.229, 0.224, 0.225], dtype=np.float32)
+    arr = (arr - mean) / std
+    arr = arr.transpose(2, 0, 1)  # HWC -> CHW
+    arr = np.expand_dims(arr, axis=0)  # Add batch dim -> NCHW
+    return arr
+
 def softmax(x: np.ndarray) -> np.ndarray:
     e = np.exp(x - np.max(x))
     return e / np.sum(e)