From 16430239d04ff738a21146c410918c285552543f Mon Sep 17 00:00:00 2001
From: Willem Jan Palenstijn <Willem.Jan.Palenstijn@cwi.nl>
Date: Wed, 23 Mar 2016 15:50:24 +0100
Subject: Add relaxation parameters to SIRT3D

---
 cuda/3d/astra3d.cu | 13 +++++++++++++
 cuda/3d/astra3d.h  |  2 ++
 cuda/3d/sirt3d.cu  |  8 +++++++-
 cuda/3d/sirt3d.h   |  5 +++++
 4 files changed, 27 insertions(+), 1 deletion(-)

(limited to 'cuda')

diff --git a/cuda/3d/astra3d.cu b/cuda/3d/astra3d.cu
index 8328229..5670873 100644
--- a/cuda/3d/astra3d.cu
+++ b/cuda/3d/astra3d.cu
@@ -267,6 +267,7 @@ public:
 	float fOriginDetectorDistance;
 	float fSourceZ;
 	float fDetSize;
+	float fRelaxation;
 
 	SConeProjection* projs;
 	SPar3DProjection* parprojs;
@@ -311,6 +312,8 @@ AstraSIRT3d::AstraSIRT3d()
 	pData->parprojs = 0;
 	pData->fOutputScale = 1.0f;
 
+	pData->fRelaxation = 1.0f;
+
 	pData->initialized = false;
 	pData->setStartReconstruction = false;
 
@@ -389,6 +392,14 @@ bool AstraSIRT3d::enableSuperSampling(unsigned int iVoxelSuperSampling,
 	return true;
 }
 
+void AstraSIRT3d::setRelaxation(float r)
+{
+	if (pData->initialized)
+		return;
+
+	pData->fRelaxation = r;
+}
+
 bool AstraSIRT3d::enableVolumeMask()
 {
 	if (pData->initialized)
@@ -448,6 +459,8 @@ bool AstraSIRT3d::init()
 	if (!ok)
 		return false;
 
+	pData->sirt.setRelaxation(pData->fRelaxation);
+
 	pData->D_volumeData = allocateVolumeData(pData->dims);
 	ok = pData->D_volumeData.ptr;
 	if (!ok)
diff --git a/cuda/3d/astra3d.h b/cuda/3d/astra3d.h
index 2782994..2137587 100644
--- a/cuda/3d/astra3d.h
+++ b/cuda/3d/astra3d.h
@@ -68,6 +68,8 @@ public:
 	bool enableSuperSampling(unsigned int iVoxelSuperSampling,
 	                         unsigned int iDetectorSuperSampling);
 
+	void setRelaxation(float r);
+
 	// Enable volume/sinogram masks
 	//
 	// This may optionally be called before init().
diff --git a/cuda/3d/sirt3d.cu b/cuda/3d/sirt3d.cu
index 484521e..713944b 100644
--- a/cuda/3d/sirt3d.cu
+++ b/cuda/3d/sirt3d.cu
@@ -59,6 +59,8 @@ SIRT::SIRT() : ReconAlgo3D()
 
 	useMinConstraint = false;
 	useMaxConstraint = false;
+
+	fRelaxation = 1.0f;
 }
 
 
@@ -89,6 +91,8 @@ void SIRT::reset()
 	useVolumeMask = false;
 	useSinogramMask = false;
 
+	fRelaxation = 1.0f;
+
 	ReconAlgo3D::reset();
 }
 
@@ -196,6 +200,8 @@ bool SIRT::precomputeWeights()
 		// scale pixel weights with mask to zero out masked pixels
 		processVol3D<opMul>(D_pixelWeight, D_maskData, dims);
 	}
+	processVol3D<opMul>(D_pixelWeight, fRelaxation, dims);
+
 
 	return true;
 }
@@ -307,7 +313,7 @@ bool SIRT::iterate(unsigned int iterations)
 	}
 #endif
 
-
+		// pixel weights also contain the volume mask and relaxation factor
 		processVol3D<opAddMul>(D_volumeData, D_tmpData, D_pixelWeight, dims);
 
 		if (useMinConstraint)
diff --git a/cuda/3d/sirt3d.h b/cuda/3d/sirt3d.h
index bb3864a..5e93deb 100644
--- a/cuda/3d/sirt3d.h
+++ b/cuda/3d/sirt3d.h
@@ -48,6 +48,9 @@ public:
 	// init should be called after setting all geometry
 	bool init();
 
+	// Set relaxation factor. This may be called after init and before iterate.
+	void setRelaxation(float r) { fRelaxation = r; }
+
 	// setVolumeMask should be called after init and before iterate,
 	// but only if enableVolumeMask was called before init.
 	// It may be called again after iterate.
@@ -91,6 +94,8 @@ protected:
 	float fMinConstraint;
 	float fMaxConstraint;
 
+	float fRelaxation;
+
 	cudaPitchedPtr D_maskData;
 	cudaPitchedPtr D_smaskData;
 
-- 
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