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# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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def bbox_area(src_bbox):
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if src_bbox[2] < src_bbox[0] or src_bbox[3] < src_bbox[1]:
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return 0.
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else:
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width = src_bbox[2] - src_bbox[0]
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height = src_bbox[3] - src_bbox[1]
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return width * height
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def jaccard_overlap(sample_bbox, object_bbox):
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if sample_bbox[0] >= object_bbox[2] or \
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sample_bbox[2] <= object_bbox[0] or \
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sample_bbox[1] >= object_bbox[3] or \
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sample_bbox[3] <= object_bbox[1]:
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return 0
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intersect_xmin = max(sample_bbox[0], object_bbox[0])
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intersect_ymin = max(sample_bbox[1], object_bbox[1])
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intersect_xmax = min(sample_bbox[2], object_bbox[2])
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intersect_ymax = min(sample_bbox[3], object_bbox[3])
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intersect_size = (intersect_xmax - intersect_xmin) * (
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intersect_ymax - intersect_ymin)
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sample_bbox_size = bbox_area(sample_bbox)
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object_bbox_size = bbox_area(object_bbox)
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overlap = intersect_size / (
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sample_bbox_size + object_bbox_size - intersect_size)
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return overlap
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