diff --git a/preprocess_imagenet_using_opencv/code_axs.py b/preprocess_imagenet_using_opencv/code_axs.py
index 6b24eeb..0abdcfa 100755
--- a/preprocess_imagenet_using_opencv/code_axs.py
+++ b/preprocess_imagenet_using_opencv/code_axs.py
@@ -6,9 +6,22 @@
 import sys
 import shutil
 
-def generate_file_list(supported_extensions, calibration_dir=None, index_file=None, first_n=None, first_n_insert=None, images_directory=None,):
-    original_file_list = os.listdir(images_directory)
-    sorted_filenames = [filename for filename in sorted(original_file_list) if any(filename.lower().endswith(extension) for extension in supported_extensions) ]
+def get_files_from_subdirs(directory, supported_extensions):
+    all_files = []
+    for entry in os.listdir(directory):
+        entry_path = os.path.join(directory, entry)
+        if os.path.isdir(entry_path):
+            for filename in os.listdir(entry_path):
+                if any(filename.lower().endswith(ext) for ext in supported_extensions):
+                    all_files.append(os.path.join(entry, filename))
+    return sorted(all_files)
+
+def generate_file_list(supported_extensions, flat_dataset_structure, calibration_dir=None, index_file=None, first_n=None, first_n_insert=None, images_directory=None,):
+    if flat_dataset_structure:
+        original_file_list = os.listdir(images_directory)
+        sorted_filenames = [filename for filename in sorted(original_file_list) if any(filename.lower().endswith(extension) for extension in supported_extensions) ]
+    else:
+        sorted_filenames = get_files_from_subdirs(images_directory, supported_extensions)
 
     if index_file:
         index_file = os.path.join(calibration_dir, index_file)
@@ -124,6 +137,7 @@ def preprocess_files(selected_filenames, images_directory, destination_dir, crop
         elif normalayout:
             image_data = norma_layout(image_data, data_type, data_layout, subtract_mean, given_channel_means, normalize_symmetric)
 
+        input_filename = os.path.basename(input_filename)
         output_filename = input_filename.rsplit('.', 1)[0] + '.' + new_file_extension if new_file_extension else input_filename
 
         output_filename_calib = input_filename.rsplit('.', 1)[0] + '.' + new_file_extension + '.raw'
diff --git a/preprocess_imagenet_using_opencv/data_axs.json b/preprocess_imagenet_using_opencv/data_axs.json
index 49aa7a1..28ac334 100644
--- a/preprocess_imagenet_using_opencv/data_axs.json
+++ b/preprocess_imagenet_using_opencv/data_axs.json
@@ -95,5 +95,6 @@
     "convert_to_unsigned": true,
     "interpolation_method": "INTER_AREA",
     "dataset_name": "imagenet",
+    "flat_dataset_structure": true,
     "file_name": "preprocessed"
 }