def METHOD_NAME(in_path):
    img_files = []
    sf_files = []
    bbox_files = []
    depth_list = []
    for (dirpath, dirnames, filenames) in os.walk(in_path):
        for file in filenames:
            filename, ext = os.path.splitext(file)
            ext = str.lower(ext)
            if ext == '.bmp':
                img_files.append(os.path.join(dirpath, file))
            # if ext == '.jpg' or ext == '.jpeg' or ext == '.gif' or ext == '.png' or ext == '.pgm':
            elif "sf" in filename:
                sf_files.append(os.path.join(dirpath, file))
            elif ext == '.xml' or ext == '.gt' or ext == '.txt':
                bbox_files.append(os.path.join(dirpath, file))
            elif "depth" in filename:
                depth_list.append(os.path.join(dirpath, file))
            elif ext == '.zip':
                continue
    img_files.sort()
    sf_files.sort()
    bbox_files.sort()
    depth_list.sort()
    return img_files, sf_files, bbox_files, depth_list