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/*
-----------------------------------------------------------------------
Copyright 2012 iMinds-Vision Lab, University of Antwerp
Contact: astra@ua.ac.be
Website: http://astra.ua.ac.be
This file is part of the
All Scale Tomographic Reconstruction Antwerp Toolbox ("ASTRA Toolbox").
The ASTRA Toolbox is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The ASTRA Toolbox is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
-----------------------------------------------------------------------
$Id$
*/
using namespace astra;
template <typename Policy>
void CFanFlatBeamLineKernelProjector2D::project(Policy& p)
{
projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
0, m_pProjectionGeometry->getDetectorCount(), p);
}
template <typename Policy>
void CFanFlatBeamLineKernelProjector2D::projectSingleProjection(int _iProjection, Policy& p)
{
projectBlock_internal(_iProjection, _iProjection + 1,
0, m_pProjectionGeometry->getDetectorCount(), p);
}
template <typename Policy>
void CFanFlatBeamLineKernelProjector2D::projectSingleRay(int _iProjection, int _iDetector, Policy& p)
{
projectBlock_internal(_iProjection, _iProjection + 1,
_iDetector, _iDetector + 1, p);
}
//----------------------------------------------------------------------------------------
// PROJECT BLOCK
template <typename Policy>
void CFanFlatBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
{
// variables
float32 sin_theta, cos_theta, inv_sin_theta, inv_cos_theta, S, T, t, I, P, x, x2;
float32 lengthPerRow, updatePerRow, inv_pixelLengthX, lengthPerCol, updatePerCol, inv_pixelLengthY;
int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector, x1;
bool switch_t;
const CFanFlatProjectionGeometry2D* pProjectionGeometry = dynamic_cast<CFanFlatProjectionGeometry2D*>(m_pProjectionGeometry);
const CFanFlatVecProjectionGeometry2D* pVecProjectionGeometry = dynamic_cast<CFanFlatVecProjectionGeometry2D*>(m_pProjectionGeometry);
float32 old_theta, theta, alpha;
const SFanProjection * proj = 0;
// loop angles
for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
// get theta
if (pProjectionGeometry) {
old_theta = pProjectionGeometry->getProjectionAngle(iAngle);
}
else if (pVecProjectionGeometry) {
proj = &pVecProjectionGeometry->getProjectionVectors()[iAngle];
old_theta = atan2(-proj->fSrcX, proj->fSrcY);
if (old_theta < 0) old_theta += 2*PI;
} else {
assert(false);
}
switch_t = false;
if (old_theta >= 7*PIdiv4) old_theta -= 2*PI;
if (old_theta >= 3*PIdiv4) {
old_theta -= PI;
switch_t = true;
}
// loop detectors
for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) {
iRayIndex = iAngle * m_pProjectionGeometry->getDetectorCount() + iDetector;
// POLICY: RAY PRIOR
if (!p.rayPrior(iRayIndex)) continue;
// get values
if (pProjectionGeometry) {
t = -pProjectionGeometry->indexToDetectorOffset(iDetector);
alpha = atan(t / pProjectionGeometry->getSourceDetectorDistance());
t = sin(alpha) * pProjectionGeometry->getOriginSourceDistance();
}
else if (pVecProjectionGeometry) {
float32 detX = proj->fDetSX + proj->fDetUX*(0.5f + iDetector);
float32 detY = proj->fDetSY + proj->fDetUY*(0.5f + iDetector);
alpha = angleBetweenVectors(-proj->fSrcX, -proj->fSrcY, detX - proj->fSrcX, detY - proj->fSrcY);
t = sin(alpha) * sqrt(proj->fSrcX*proj->fSrcX + proj->fSrcY*proj->fSrcY);
} else {
assert(false);
}
if (switch_t) t = -t;
theta = old_theta + alpha;
// precalculate sin, cos, 1/cos
sin_theta = sin(theta);
cos_theta = cos(theta);
inv_sin_theta = 1.0f / sin_theta;
inv_cos_theta = 1.0f / cos_theta;
// precalculate kernel limits
lengthPerRow = m_pVolumeGeometry->getPixelLengthY() * inv_cos_theta;
updatePerRow = sin_theta * inv_cos_theta;
inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX();
// precalculate kernel limits
lengthPerCol = m_pVolumeGeometry->getPixelLengthX() * inv_sin_theta;
updatePerCol = cos_theta * inv_sin_theta;
inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY();
// precalculate S and T
S = 0.5f - 0.5f * ((updatePerRow < 0) ? -updatePerRow : updatePerRow);
T = 0.5f - 0.5f * ((updatePerCol < 0) ? -updatePerCol : updatePerCol);
// vertically
if (old_theta <= PIdiv4) {
// calculate x for row 0
P = (t - sin_theta * m_pVolumeGeometry->pixelRowToCenterY(0)) * inv_cos_theta;
x = (P - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX;
// for each row
for (row = 0; row < m_pVolumeGeometry->getGridRowCount(); ++row) {
// get coords
x1 = int((x > 0.0f) ? x : x-1.0f);
x2 = x - x1;
x += updatePerRow;
if (x1 < -1 || x1 > m_pVolumeGeometry->getGridColCount()) continue;
// left
if (x2 < 0.5f-S) {
I = (0.5f - S + x2) / (1.0f - 2.0f*S) * lengthPerRow;
if (x1-1 >= 0 /*&& x1-1 < m_pVolumeGeometry->getGridColCount()*/) {//x1 is always less than or equal to gridColCount because of the "continue" in the beginning of the for-loop
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1-1);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I);
p.pixelPosterior(iVolumeIndex);
}
}
if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) {
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, I);
p.pixelPosterior(iVolumeIndex);
}
}
}
// center
else if (x2 <= 0.5f+S) {
if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) {
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow);
p.pixelPosterior(iVolumeIndex);
}
}
}
// right
else if (x2 <= 1.0f) {
I = (1.5f - S - x2) / (1.0f - 2.0f*S) * lengthPerRow;
if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) {
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, I);
p.pixelPosterior(iVolumeIndex);
}
}
if (/*x1+1 >= 0 &&*/ x1+1 < m_pVolumeGeometry->getGridColCount()) {//x1 is always greater than or equal to -1 because of the "continue" in the beginning of the for-loop
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1+1);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I);
p.pixelPosterior(iVolumeIndex);
}
}
}
}
}
// horizontally
//else if (PIdiv4 <= old_theta && old_theta <= 3*PIdiv4) {
else {
// calculate point P
P = (t - cos_theta * m_pVolumeGeometry->pixelColToCenterX(0)) * inv_sin_theta;
x = (m_pVolumeGeometry->getWindowMaxY() - P) * inv_pixelLengthY;
// for each col
for (col = 0; col < m_pVolumeGeometry->getGridColCount(); ++col) {
// get coords
x1 = int((x > 0.0f) ? x : x-1.0f);
x2 = x - x1;
x += updatePerCol;
if (x1 < -1 || x1 > m_pVolumeGeometry->getGridRowCount()) continue;
// up
if (x2 < 0.5f-T) {
I = (0.5f - T + x2) / (1.0f - 2.0f*T) * lengthPerCol;
if (x1-1 >= 0 /*&& x1-1 < m_pVolumeGeometry->getGridRowCount()*/) {//x1 is always less than or equal to gridRowCount because of the "continue" in the beginning of the for-loop
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1-1, col);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I);
p.pixelPosterior(iVolumeIndex);
}
}
if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) {
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, I);
p.pixelPosterior(iVolumeIndex);
}
}
}
// center
else if (x2 <= 0.5f+T) {
if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) {
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol);
p.pixelPosterior(iVolumeIndex);
}
}
}
// down
else if (x2 <= 1.0f) {
I = (1.5f - T - x2) / (1.0f - 2.0f*T) * lengthPerCol;
if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) {
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, I);
p.pixelPosterior(iVolumeIndex);
}
}
if (/*x1+1 >= 0 &&*/ x1+1 < m_pVolumeGeometry->getGridRowCount()) {//x1 is always greater than or equal to -1 because of the "continue" in the beginning of the for-loop
iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1+1, col);
// POLICY: PIXEL PRIOR + ADD + POSTERIOR
if (p.pixelPrior(iVolumeIndex)) {
p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I);
p.pixelPosterior(iVolumeIndex);
}
}
}
}
} // end loop col
// POLICY: RAY POSTERIOR
p.rayPosterior(iRayIndex);
} // end loop detector
} // end loop angles
}
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