[ITK-users] [ITK] Bug in itkMattesMutualInformationImageToImageMetric.hxx ?

[Ivan Setiawan]

Hi Brad, Bill,

Following your suggestions, I've changed the initial ImageTrueMin to NumericTraits::NonpositiveMin().
Also, I've change the initial ImageTrueMax to NumericeTraits::max(), to unify it with the above.
Three files were modified.


This is the first time for me to submit a patch, and I don't know the best-fit reviewers, so I chose both of you.

Thank you and best regards,
Ivan Setiawan


----- Original Message -----
>From: Bradley Lowekamp <blowekamp at mail.nih.gov>
>To: Bill Lorensen <bill.lorensen at gmail.com> 
>Cc: Ivan Setiawan <ivans at yahoo.co.jp>; insight-users <insight-users at itk.org>
>Date: 2015/5/1, Fri 21:16
>Subject: Re: [ITK] [ITK-users] Bug in itkMattesMutualInformationImageToImageMetric.hxx ?
> 
>Hello,
>
>The numeric_limits::lowest() seems to be a new C++11 method [1].
>
>I believe NumericTraits::NonpositiveMin() will work.
>
>Thanks for finding this issue! Please include a test :)
>
>Brad
>
>
>[1] http://en.cppreference.com/w/cpp/types/numeric_limits/lowest
>
>On May 1, 2015, at 8:04 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>
>> Looks like you found a bug. Please submit a patch through gerrit:
>> http://www.itk.org/Wiki/ITK/Git/Develop
>> 
>> Thanks
>> 
>> 
>> On Fri, May 1, 2015 at 2:54 AM, Ivan Setiawan <ivans at yahoo.co.jp> wrote:
>>> Hi all,
>>> My name is Ivan, and currently I am developing an image registration
>>> software based on ITK.
>>> Thank you for providing such a good library!
>>> 
>>> I think, I found a bug for determining the voxel's value range in
>>> itkMattesMutualInformationImageToImageMetric.hxx.
>>> 
>>> In the ::Initialize(void) method, the initial value of
>>> this->m_FixedImageTrueMax and this->m_MovingImageTrueMax should be set to
>>>    std::numeric_limits<typename TFixedImage::PixelType>::lowest()  /* i.e.,
>>> the most negative value, = -340282346638528860000000000000000000000.000000
>>> for float-type image */
>>> instead of
>>>    std::numeric_limits<typename TFixedImage::PixelType>::min() /* =
>>> 1.17549e-038 for float-type image. */
>>> 
>>> The code lines are:
>>>    this->m_FixedImageTrueMax = std::numeric_limits<typename
>>> TFixedImage::PixelType>::min(); // should be lowest() instead of min()?
>>>    this->m_MovingImageTrueMax = std::numeric_limits<typename
>>> TMovingImage::PixelType>::min(); // should be lowest() instead of min()?
>>> 
>>> Problem will not appear when using short-type image, but when a float-type
>>> image with all negative voxel's value is used as input, then the initial
>>> m_FixedImageTrueMax will NOT be updated to the correct negative maximum
>>> value.
>>> 
>>> Could you please tell me your opinion?
>>> 
>>> Thank you very much for your attention.
>>> 
>>> Best regards,
>>> Ivan
>>> 
>>> 
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>> 
>> 
>> -- 
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