cxImageEnveloper.cpp

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/*=========================================================================
This file is part of CustusX, an Image Guided Therapy Application.

Copyright (c) 2008-2014, SINTEF Department of Medical Technology
All rights reserved.

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#include "cxImageEnveloper.h"
#include "cxImage.h"
#include "cxVolumeHelpers.h"
#include "vtkImageData.h"
#include "cxRegistrationTransform.h"
#include "cxTypeConversions.h"
#include "cxBoundingBox3D.h"
#include "cxImageTF3D.h"


namespace cx
{
ImageEnveloperPtr ImageEnveloper::create()
{
        return ImageEnveloperPtr(new ImageEnveloper());
}

ImageEnveloper::ImageEnveloper() : mMaxEnvelopeVoxels(10*1000*1000)
{

}

void ImageEnveloper::setMaxEnvelopeVoxels(long maxVoxels)
{
        mMaxEnvelopeVoxels = maxVoxels;
}

void ImageEnveloper::setImages(std::vector<ImagePtr> images)
{
        mImages = images;
}

ImagePtr ImageEnveloper::getEnvelopingImage()
{
        ImageParameters box = this->createEnvelopeParametersFromImage(mImages[0]);
        for(unsigned i = 1; i < mImages.size(); ++i)
                box = selectParametersWithSmallestExtent(box, this->createEnvelopeParametersFromImage(mImages[i]));

        box.limitVoxelsKeepBounds(mMaxEnvelopeVoxels);

        ImagePtr retval = this->createEnvelopeFromParameters(box);

        return retval;
}

ImageParameters ImageEnveloper::createEnvelopeParametersFromImage(ImagePtr img)
{
        ImageParameters retval;

        DoubleBoundingBox3D bb = findEnclosingBoundingBox(mImages, img->get_rMd().inverse());

        retval.setSpacingKeepDim(this->getMinimumSpacingFromAllImages(img->get_rMd().inverse()));
        retval.setDimKeepBoundsAlignSpacing(bb.range().array());
        retval.mParentVolume = img->getUid();

        Vector3D shift = bb.bottomLeft();

        retval.m_rMd = img->get_rMd() * createTransformTranslate(shift);

        return retval;
}

ImageParameters ImageEnveloper::selectParametersWithSmallestExtent(ImageParameters a, ImageParameters b)
{
        if (a.getVolume() <= b.getVolume())
                return a;
        else
                return b;
}

ImageParameters ImageEnveloper::selectParametersWithFewestVoxels(ImageParameters a, ImageParameters b)
{
        if (a.getNumVoxels() <= b.getNumVoxels())
                return a;
        else
                return b;
}

Eigen::Array3d ImageEnveloper::getMinimumSpacingFromAllImages(Transform3D qMr)
{
        Eigen::Array3d retval;
        retval = this->getTransformedSpacing(mImages[0]->getSpacing(), qMr * mImages[0]->get_rMd());
        for (unsigned i = 1; i < mImages.size(); ++i)
        {
                Eigen::Array3d current = this->getTransformedSpacing(mImages[i]->getSpacing(), qMr * mImages[i]->get_rMd());
                retval = retval.min(current);
        }
        return retval;
}

Eigen::Array3d ImageEnveloper::getTransformedSpacing(Eigen::Array3d spacing, Transform3D qMd)
{
        Eigen::Array3d retval;

        //Create spacing vectors in img coord syst (d)
        Vector3D sx = Vector3D(spacing[0], 0, 0);
        Vector3D sy = Vector3D(0, spacing[1], 0);
        Vector3D sz = Vector3D(0, 0, spacing[2]);

        //Transform to q coord syst
        sx = qMd.vector(sx);
        sy = qMd.vector(sy);
        sz = qMd.vector(sz);

        //Find spacing for each axis
        for (unsigned i = 0; i < 3; ++i)
        {
                retval[i] = std::max(fabs(sx[i]), fabs(sy[i]));
                retval[i] = std::max(retval[i], fabs(sz[i]));
        }

        return retval;
}

ImagePtr ImageEnveloper::createEnvelopeFromParameters(ImageParameters box)
{
        int maxRange = this->getMaxScalarRange();

        vtkImageDataPtr imageData = generateVtkImageDataUnsignedShort(box.getDim(), box.getSpacing(), maxRange, 1);

        QString uid = QString("envelope_image_%1").arg(box.mParentVolume);
        ImagePtr retval(new Image(uid, imageData));
        retval->get_rMd_History()->setRegistration(box.m_rMd);
        retval->get_rMd_History()->setParentSpace(box.mParentVolume);
        retval->setAcquisitionTime(QDateTime::currentDateTime());
        retval->setModality("SC");

        return retval;
}

int ImageEnveloper::getMaxScalarRange()
{
        int maxRange = 0;
        for (unsigned i=0; i<mImages.size(); ++i)
                maxRange = std::max<int>(maxRange, mImages[i]->getBaseVtkImageData()->GetScalarRange()[1]);
        return maxRange;
}

} // namespace cx