CorrespondenceChecker.h

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// The MIT License (MIT)
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#pragma once

#include <vector>
#include <memory>
#include <string>
#include <Eigen/Core>

#include <Open3D/Registration/TransformationEstimation.h>

namespace open3d {

namespace geometry {
class PointCloud;
}

namespace registration {
class CorrespondenceChecker {
public:
    CorrespondenceChecker(bool require_pointcloud_alignment)
        : require_pointcloud_alignment_(require_pointcloud_alignment) {}
    virtual ~CorrespondenceChecker() {}

public:
    virtual bool Check(const geometry::PointCloud &source,
                       const geometry::PointCloud &target,
                       const CorrespondenceSet &corres,
                       const Eigen::Matrix4d &transformation) const = 0;

public:
    bool require_pointcloud_alignment_;
};

class CorrespondenceCheckerBasedOnEdgeLength : public CorrespondenceChecker {
public:
    CorrespondenceCheckerBasedOnEdgeLength(double similarity_threshold = 0.9)
        : CorrespondenceChecker(false),
          similarity_threshold_(similarity_threshold) {}
    ~CorrespondenceCheckerBasedOnEdgeLength() override {}

public:
    bool Check(const geometry::PointCloud &source,
               const geometry::PointCloud &target,
               const CorrespondenceSet &corres,
               const Eigen::Matrix4d &transformation) const override;

public:
    double similarity_threshold_;
};

class CorrespondenceCheckerBasedOnDistance : public CorrespondenceChecker {
public:
    CorrespondenceCheckerBasedOnDistance(double distance_threshold)
        : CorrespondenceChecker(true),
          distance_threshold_(distance_threshold) {}
    ~CorrespondenceCheckerBasedOnDistance() override {}

public:
    bool Check(const geometry::PointCloud &source,
               const geometry::PointCloud &target,
               const CorrespondenceSet &corres,
               const Eigen::Matrix4d &transformation) const override;

public:
    double distance_threshold_;
};

class CorrespondenceCheckerBasedOnNormal : public CorrespondenceChecker {
public:
    CorrespondenceCheckerBasedOnNormal(double normal_angle_threshold)
        : CorrespondenceChecker(true),
          normal_angle_threshold_(normal_angle_threshold) {}
    ~CorrespondenceCheckerBasedOnNormal() override {}

public:
    bool Check(const geometry::PointCloud &source,
               const geometry::PointCloud &target,
               const CorrespondenceSet &corres,
               const Eigen::Matrix4d &transformation) const override;

public:
    double normal_angle_threshold_;
};

}  // namespace registration
}  // namespace open3d