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authorEric Dao <eric@erickhangdao.com>2025-03-10 17:54:31 -0400
committerEric Dao <eric@erickhangdao.com>2025-03-10 17:54:31 -0400
commitab224e2e6ba65f5a369ec392f99cd8845ad06c98 (patch)
treea1e757e9341863ed52b8ad4c5a1c45933aab9da4 /python/openvino/runtime/common/demo_utils/include/utils/nms.hpp
parent40da1752f2c8639186b72f6838aa415e854d0b1d (diff)
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+/*
+// Copyright (C) 2021-2022 Intel Corporation
+//
+// 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.
+*/
+
+#pragma once
+
+#include "opencv2/core.hpp"
+#include <numeric>
+#include <vector>
+
+struct Anchor {
+ float left;
+ float top;
+ float right;
+ float bottom;
+
+ float getWidth() const {
+ return (right - left) + 1.0f;
+ }
+ float getHeight() const {
+ return (bottom - top) + 1.0f;
+ }
+ float getXCenter() const {
+ return left + (getWidth() - 1.0f) / 2.0f;
+ }
+ float getYCenter() const {
+ return top + (getHeight() - 1.0f) / 2.0f;
+ }
+};
+
+template <typename Anchor>
+std::vector<int> nms(const std::vector<Anchor>& boxes, const std::vector<float>& scores,
+ const float thresh, bool includeBoundaries=false) {
+ std::vector<float> areas(boxes.size());
+ for (size_t i = 0; i < boxes.size(); ++i) {
+ areas[i] = (boxes[i].right - boxes[i].left + includeBoundaries) * (boxes[i].bottom - boxes[i].top + includeBoundaries);
+ }
+ std::vector<int> order(scores.size());
+ std::iota(order.begin(), order.end(), 0);
+ std::sort(order.begin(), order.end(), [&scores](int o1, int o2) { return scores[o1] > scores[o2]; });
+
+ size_t ordersNum = 0;
+ for (; ordersNum < order.size() && scores[order[ordersNum]] >= 0; ordersNum++);
+
+ std::vector<int> keep;
+ bool shouldContinue = true;
+ for (size_t i = 0; shouldContinue && i < ordersNum; ++i) {
+ auto idx1 = order[i];
+ if (idx1 >= 0) {
+ keep.push_back(idx1);
+ shouldContinue = false;
+ for (size_t j = i + 1; j < ordersNum; ++j) {
+ auto idx2 = order[j];
+ if (idx2 >= 0) {
+ shouldContinue = true;
+ auto overlappingWidth = std::fminf(boxes[idx1].right, boxes[idx2].right) - std::fmaxf(boxes[idx1].left, boxes[idx2].left);
+ auto overlappingHeight = std::fminf(boxes[idx1].bottom, boxes[idx2].bottom) - std::fmaxf(boxes[idx1].top, boxes[idx2].top);
+ auto intersection = overlappingWidth > 0 && overlappingHeight > 0 ? overlappingWidth * overlappingHeight : 0;
+ auto overlap = intersection / (areas[idx1] + areas[idx2] - intersection);
+
+ if (overlap >= thresh) {
+ order[j] = -1;
+ }
+ }
+ }
+ }
+ }
+ return keep;
+}