107 lines
3.6 KiB
C++
107 lines
3.6 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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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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#include <cmath>
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#include "mediapipe/framework/calculator_framework.h"
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#include "mediapipe/framework/formats/rect.pb.h"
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namespace mediapipe {
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namespace {
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constexpr char kNormRectTag[] = "NORM_RECT";
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constexpr char kNormReferenceRectTag[] = "NORM_REFERENCE_RECT";
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} // namespace
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// Projects rectangle from reference coordinate system (defined by reference
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// rectangle) to original coordinate system (in which this reference rectangle
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// is defined).
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//
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// Inputs:
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// NORM_RECT - A NormalizedRect to be projected.
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// NORM_REFERENCE_RECT - A NormalizedRect that represents reference coordinate
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// system for NORM_RECT and is defined in original coordinates.
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//
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// Outputs:
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// NORM_RECT: A NormalizedRect projected to the original coordinates.
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//
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// Example config:
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// node {
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// calculator: "RectProjectionCalculator"
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// input_stream: "NORM_RECT:face_rect"
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// input_stream: "NORM_REFERENCE_RECT:face_reference_rect"
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// output_stream: "NORM_RECT:projected_face_rect"
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// }
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//
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class RectProjectionCalculator : public CalculatorBase {
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public:
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static absl::Status GetContract(CalculatorContract* cc);
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absl::Status Open(CalculatorContext* cc) override;
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absl::Status Process(CalculatorContext* cc) override;
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};
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REGISTER_CALCULATOR(RectProjectionCalculator);
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absl::Status RectProjectionCalculator::GetContract(CalculatorContract* cc) {
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cc->Inputs().Tag(kNormRectTag).Set<NormalizedRect>();
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cc->Inputs().Tag(kNormReferenceRectTag).Set<NormalizedRect>();
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cc->Outputs().Tag(kNormRectTag).Set<NormalizedRect>();
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return absl::OkStatus();
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}
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absl::Status RectProjectionCalculator::Open(CalculatorContext* cc) {
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cc->SetOffset(TimestampDiff(0));
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return absl::OkStatus();
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}
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absl::Status RectProjectionCalculator::Process(CalculatorContext* cc) {
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if (cc->Inputs().Tag(kNormRectTag).IsEmpty()) {
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return absl::OkStatus();
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}
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const auto& rect = cc->Inputs().Tag(kNormRectTag).Get<NormalizedRect>();
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const auto& reference_rect =
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cc->Inputs().Tag(kNormReferenceRectTag).Get<NormalizedRect>();
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// Project center.
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const float x = rect.x_center() - 0.5f;
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const float y = rect.y_center() - 0.5f;
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const float angle = reference_rect.rotation();
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float new_x = std::cos(angle) * x - std::sin(angle) * y;
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float new_y = std::sin(angle) * x + std::cos(angle) * y;
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new_x = new_x * reference_rect.width() + reference_rect.x_center();
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new_y = new_y * reference_rect.height() + reference_rect.y_center();
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// Project size.
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const float new_width = rect.width() * reference_rect.width();
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const float new_height = rect.height() * reference_rect.height();
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// Project rotation.
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const float new_rotation = rect.rotation() + reference_rect.rotation();
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auto new_rect = absl::make_unique<NormalizedRect>();
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new_rect->set_x_center(new_x);
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new_rect->set_y_center(new_y);
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new_rect->set_width(new_width);
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new_rect->set_height(new_height);
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new_rect->set_rotation(new_rotation);
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cc->Outputs().Tag(kNormRectTag).Add(new_rect.release(), cc->InputTimestamp());
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return absl::OkStatus();
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}
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} // namespace mediapipe
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