camera_utilities.h

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#ifndef MULTISENSE_ROS_CAMERA_UTILITIES_H
#define MULTISENSE_ROS_CAMERA_UTILITIES_H

#include <tuple>
#include <mutex>

#include <Eigen/Core>
#include <opencv2/opencv.hpp>

#include <ros/ros.h>
#include <sensor_msgs/CameraInfo.h>

#include <multisense_lib/MultiSenseChannel.hh>
#include <multisense_lib/MultiSenseTypes.hh>

namespace multisense_ros {

enum class BorderClip {NONE, RECTANGULAR, CIRCULAR};

struct RectificationRemapT
{
    cv::Mat map1;
    cv::Mat map2;
};

template <typename T>
class BufferWrapper
{
public:
    BufferWrapper(crl::multisense::Channel* driver,
                 const T &data):
        driver_(driver),
        callback_buffer_(driver->reserveCallbackBuffer()),
        data_(data)
    {
    }

    ~BufferWrapper()
    {
        driver_->releaseCallbackBuffer(callback_buffer_);
    }

    const T &data() const noexcept
    {
        return data_;
    }

private:

    BufferWrapper(const BufferWrapper&) = delete;
    BufferWrapper operator=(const BufferWrapper&) = delete;

    crl::multisense::Channel * driver_;
    void* callback_buffer_;
    const T data_;

};

template <typename T>
constexpr Eigen::Matrix<T, 3, 1> ycbcrToBgr(const crl::multisense::image::Header &luma,
                                            const crl::multisense::image::Header &chroma,
                                            size_t u,
                                            size_t v)
{
    const uint8_t *lumaP = reinterpret_cast<const uint8_t*>(luma.imageDataP);
    const uint8_t *chromaP = reinterpret_cast<const uint8_t*>(chroma.imageDataP);

    const size_t luma_offset = (v * luma.width) + u;
    const size_t chroma_offset = 2 * (((v/2) * (luma.width/2)) + (u/2));

    const float px_y = static_cast<float>(lumaP[luma_offset]);
    const float px_cb = static_cast<float>(chromaP[chroma_offset+0]) - 128.0f;
    const float px_cr = static_cast<float>(chromaP[chroma_offset+1]) - 128.0f;

    float px_r  = px_y + 1.402f   * px_cr;
    float px_g  = px_y - 0.34414f * px_cb - 0.71414f * px_cr;
    float px_b  = px_y + 1.772f   * px_cb;

    if (px_r < 0.0f)        px_r = 0.0f;
    else if (px_r > 255.0f) px_r = 255.0f;
    if (px_g < 0.0f)        px_g = 0.0f;
    else if (px_g > 255.0f) px_g = 255.0f;
    if (px_b < 0.0f)        px_b = 0.0f;
    else if (px_b > 255.0f) px_b = 255.0f;

    return Eigen::Matrix<T, 3, 1>{static_cast<T>(px_b), static_cast<T>(px_g), static_cast<T>(px_r)};
}

void ycbcrToBgr(const crl::multisense::image::Header &luma,
                const crl::multisense::image::Header &chroma,
                uint8_t *output);

Eigen::Matrix4d makeQ(const crl::multisense::image::Config& config,
                      const crl::multisense::image::Calibration& calibration,
                      const crl::multisense::system::DeviceInfo& device_info);

sensor_msgs::CameraInfo makeCameraInfo(const crl::multisense::image::Config& config,
                                       const crl::multisense::image::Calibration::Data& calibration,
                                       const crl::multisense::system::DeviceInfo& device_info,
                                       bool scale_calibration);

RectificationRemapT makeRectificationRemap(const crl::multisense::image::Config& config,
                                           const crl::multisense::image::Calibration::Data& calibration,
                                           const crl::multisense::system::DeviceInfo& device_info);
class StereoCalibrationManger
{
public:
    EIGEN_MAKE_ALIGNED_OPERATOR_NEW

    StereoCalibrationManger(const crl::multisense::image::Config& config,
                            const crl::multisense::image::Calibration& calibration,
                            const crl::multisense::system::DeviceInfo& device_info);

    void updateConfig(const crl::multisense::image::Config& config);

    crl::multisense::image::Config config() const;

    Eigen::Matrix4d Q() const;

    double T() const;

    double aux_T() const;

    bool validAux() const;

    sensor_msgs::CameraInfo leftCameraInfo(const std::string& frame_id, const ros::Time& stamp) const;
    sensor_msgs::CameraInfo rightCameraInfo(const std::string& frame_id, const ros::Time& stamp) const;
    sensor_msgs::CameraInfo auxCameraInfo(const std::string& frame_id, const ros::Time& stamp) const;

    std::shared_ptr<RectificationRemapT> leftRemap() const;
    std::shared_ptr<RectificationRemapT> rightRemap() const;

private:

    crl::multisense::image::Config config_;
    const crl::multisense::image::Calibration calibration_;
    const crl::multisense::system::DeviceInfo& device_info_;

    //
    // Protect our cache during calibration updates

    mutable std::mutex mutex_;

    //
    // Cache for quick queries

    Eigen::Matrix4d q_matrix_;

    sensor_msgs::CameraInfo left_camera_info_;
    sensor_msgs::CameraInfo right_camera_info_;
    sensor_msgs::CameraInfo aux_camera_info_;

    std::shared_ptr<RectificationRemapT> left_remap_;
    std::shared_ptr<RectificationRemapT> right_remap_;
};

}// namespace

#endif