diff options
Diffstat (limited to 'cuda/2d/par_bp.cu')
| -rw-r--r-- | cuda/2d/par_bp.cu | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/cuda/2d/par_bp.cu b/cuda/2d/par_bp.cu index 21484b1..3bf78ee 100644 --- a/cuda/2d/par_bp.cu +++ b/cuda/2d/par_bp.cu @@ -176,7 +176,7 @@ __global__ void devBP_SART(float* D_volData, unsigned int volPitch, float offset const float fT = fX * angle_cos - fY * angle_sin + offset; const float fVal = tex2D(gT_projTexture, fT, 0.5f); - // NB: The 'scale' constant in devBP has been folded into fOutputScale by the caller here + // NB: The 'scale' constant in devBP is cancelled out by the SART weighting D_volData[Y*volPitch+X] += fVal * fOutputScale; } @@ -280,7 +280,8 @@ bool BP_SART(float* D_volumeData, unsigned int volumePitch, float angle_scaled_cos = angles[angle].fRayY / d; float angle_scaled_sin = -angles[angle].fRayX / d; // TODO: Check signs float angle_offset = (angles[angle].fDetSY * angles[angle].fRayX - angles[angle].fDetSX * angles[angle].fRayY) / d; - fOutputScale *= sqrt(angles[angle].fRayX * angles[angle].fRayX + angles[angle].fRayY * angles[angle].fRayY) / abs(d); + // NB: The adjoint scaling factor from regular BP is cancelled out by the SART weighting + //fOutputScale *= sqrt(angles[angle].fRayX * angles[angle].fRayX + angles[angle].fRayY * angles[angle].fRayY) / abs(d); dim3 dimBlock(g_blockSlices, g_blockSliceSize); dim3 dimGrid((dims.iVolWidth+g_blockSlices-1)/g_blockSlices, |