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# Copyright (c) 2022 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.
def bbox_area(src_bbox):
if src_bbox[2] < src_bbox[0] or src_bbox[3] < src_bbox[1]:
return 0.
else:
width = src_bbox[2] - src_bbox[0]
height = src_bbox[3] - src_bbox[1]
return width * height
def jaccard_overlap(sample_bbox, object_bbox):
if sample_bbox[0] >= object_bbox[2] or \
sample_bbox[2] <= object_bbox[0] or \
sample_bbox[1] >= object_bbox[3] or \
sample_bbox[3] <= object_bbox[1]:
return 0
intersect_xmin = max(sample_bbox[0], object_bbox[0])
intersect_ymin = max(sample_bbox[1], object_bbox[1])
intersect_xmax = min(sample_bbox[2], object_bbox[2])
intersect_ymax = min(sample_bbox[3], object_bbox[3])
intersect_size = (intersect_xmax - intersect_xmin) * (
intersect_ymax - intersect_ymin)
sample_bbox_size = bbox_area(sample_bbox)
object_bbox_size = bbox_area(object_bbox)
overlap = intersect_size / (
sample_bbox_size + object_bbox_size - intersect_size)
return overlap