MantisBT - ITK |
| View Issue Details |
|
| ID | Project | Category | View Status | Date Submitted | Last Update |
| 0004962 | ITK | | public | 2007-05-02 10:45 | 2007-09-17 10:20 |
|
| Reporter | Ivan Macia | |
| Assigned To | Julien Jomier | |
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | fixed | |
| Platform | | OS | | OS Version | |
| Product Version | | |
| Target Version | | Fixed in Version | | |
| Resolution Date | |
| Sprint | |
| Sprint Status | |
|
| Summary | 0004962: Error in normalization in itk::GaussianDerivativeSpatialFunction |
| Description | In file itkGaussianDerivativeSpatialFunction when using m_Normalized to calculate a gaussian of unit area, the normalization factor seems to be wrong. According to what I expect (see attached document) the lines
if (m_Normalized)
{
prefixDenom = m_Sigma[0]*m_Sigma[0]*m_Sigma[0];
for(unsigned int i = 1; i < VImageDimension; i++)
{
prefixDenom *= m_Sigma[i]*m_Sigma[i]*m_Sigma[i];
}
prefixDenom *= 2 * 3.1415927;
}
should be replaced by
if (m_Normalized)
{
prefixDenom = m_Sigma[m_Direction]*m_Sigma[m_Direction]
for(unsigned int i = 0; i < VImageDimension; i++)
prefixDenom *= m_Sigma[i];
prefixDenom *= vcl_pow( 2 * 3.1415927, VImageDimension / 2.0);
}
Also in line 78 multiplying by 2 at the beginning is not correct. |
| Steps To Reproduce | |
| Additional Information | |
| Tags | No tags attached. |
| Relationships | |
| Attached Files |  NormalizedGaussianDerivatives.pdf (21,791) 1969-12-31 19:00
https://public.kitware.com/Bug/file/988/NormalizedGaussianDerivatives.pdf |
|
| Issue History |
| Date Modified | Username | Field | Change |
| 2007-09-17 10:20 | Luis Ibanez | Note Added: 0009016 | |