# Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import os import numpy as np import xml.etree.ElementTree as ET from ppdet.core.workspace import register, serializable from .dataset import DataSet import logging logger = logging.getLogger(__name__) @register @serializable class VOCDataSet(DataSet): """ Load dataset with PascalVOC format. Notes: `anno_path` must contains xml file and image file path for annotations. Args: dataset_dir (str): root directory for dataset. image_dir (str): directory for images. anno_path (str): voc annotation file path. sample_num (int): number of samples to load, -1 means all. use_default_label (bool): whether use the default mapping of label to integer index. Default True. with_background (bool): whether load background as a class, default True. label_list (str): if use_default_label is False, will load mapping between category and class index. """ def __init__(self, dataset_dir=None, image_dir=None, anno_path=None, sample_num=-1, use_default_label=False, with_background=True, label_list='label_list.txt'): super(VOCDataSet, self).__init__( image_dir=image_dir, anno_path=anno_path, sample_num=sample_num, dataset_dir=dataset_dir, with_background=with_background) # roidbs is list of dict whose structure is: # { # 'im_file': im_fname, # image file name # 'im_id': im_id, # image id # 'h': im_h, # height of image # 'w': im_w, # width # 'is_crowd': is_crowd, # 'gt_class': gt_class, # 'gt_score': gt_score, # 'gt_bbox': gt_bbox, # 'difficult': difficult # } self.roidbs = None # 'cname2id' is a dict to map category name to class id self.cname2cid = None self.use_default_label = use_default_label self.label_list = label_list def load_roidb_and_cname2cid(self): anno_path = os.path.join(self.dataset_dir, self.anno_path) image_dir = os.path.join(self.dataset_dir, self.image_dir) # mapping category name to class id # if with_background is True: # background:0, first_class:1, second_class:2, ... # if with_background is False: # first_class:0, second_class:1, ... records = [] ct = 0 cname2cid = {} if not self.use_default_label: label_path = os.path.join(self.dataset_dir, self.label_list) if not os.path.exists(label_path): raise ValueError("label_list {} does not exists".format( label_path)) with open(label_path, 'r') as fr: label_id = int(self.with_background) for line in fr.readlines(): cname2cid[line.strip()] = label_id label_id += 1 else: cname2cid = pascalvoc_label(self.with_background) with open(anno_path, 'r') as fr: while True: line = fr.readline() if not line: break img_file, xml_file = [os.path.join(image_dir, x) \ for x in line.strip().split()[:2]] if not os.path.exists(img_file): logger.warn( 'Illegal image file: {}, and it will be ignored'.format( img_file)) continue if not os.path.isfile(xml_file): logger.warn('Illegal xml file: {}, and it will be ignored'. format(xml_file)) continue tree = ET.parse(xml_file) if tree.find('id') is None: im_id = np.array([ct]) else: im_id = np.array([int(tree.find('id').text)]) objs = tree.findall('object') im_w = float(tree.find('size').find('width').text) im_h = float(tree.find('size').find('height').text) if im_w < 0 or im_h < 0: logger.warn( 'Illegal width: {} or height: {} in annotation, ' 'and {} will be ignored'.format(im_w, im_h, xml_file)) continue gt_bbox = [] gt_class = [] gt_score = [] is_crowd = [] difficult = [] for i, obj in enumerate(objs): cname = obj.find('name').text _difficult = int(obj.find('difficult').text) x1 = float(obj.find('bndbox').find('xmin').text) y1 = float(obj.find('bndbox').find('ymin').text) x2 = float(obj.find('bndbox').find('xmax').text) y2 = float(obj.find('bndbox').find('ymax').text) x1 = max(0, x1) y1 = max(0, y1) x2 = min(im_w - 1, x2) y2 = min(im_h - 1, y2) if x2 > x1 and y2 > y1: gt_bbox.append([x1, y1, x2, y2]) gt_class.append([cname2cid[cname]]) gt_score.append([1.]) is_crowd.append([0]) difficult.append([_difficult]) else: logger.warn( 'Found an invalid bbox in annotations: xml_file: {}' ', x1: {}, y1: {}, x2: {}, y2: {}.'.format( xml_file, x1, y1, x2, y2)) gt_bbox = np.array(gt_bbox).astype('float32') gt_class = np.array(gt_class).astype('int32') gt_score = np.array(gt_score).astype('float32') is_crowd = np.array(is_crowd).astype('int32') difficult = np.array(difficult).astype('int32') voc_rec = { 'im_file': img_file, 'im_id': im_id, 'h': im_h, 'w': im_w, 'is_crowd': is_crowd, 'gt_class': gt_class, 'gt_score': gt_score, 'gt_bbox': gt_bbox, 'difficult': difficult } if len(objs) != 0: records.append(voc_rec) ct += 1 if self.sample_num > 0 and ct >= self.sample_num: break assert len(records) > 0, 'not found any voc record in %s' % ( self.anno_path) logger.debug('{} samples in file {}'.format(ct, anno_path)) self.roidbs, self.cname2cid = records, cname2cid def pascalvoc_label(with_background=True): labels_map = { 'aeroplane': 1, 'bicycle': 2, 'bird': 3, 'boat': 4, 'bottle': 5, 'bus': 6, 'car': 7, 'cat': 8, 'chair': 9, 'cow': 10, 'diningtable': 11, 'dog': 12, 'horse': 13, 'motorbike': 14, 'person': 15, 'pottedplant': 16, 'sheep': 17, 'sofa': 18, 'train': 19, 'tvmonitor': 20 } if not with_background: labels_map = {k: v - 1 for k, v in labels_map.items()} return labels_map