[Insight-users] [ITK Community] Cost function value increases

[Hana Cherif]

I get that my program does not take into account the header files from my
optimizer , as when I tried to modify the header file optimizer so that it
displays me an error !! when I did the compilation it works without any
error !

 Would you give me some hint of that please, thanks


2013/11/28 Brian Helba <brian.helba at kitware.com>

> I would try some much larger maximum step values. You program appears to
> be spending iterations while not making very much progress at the start.
>
> Also, when you're tuning things, it can be helpful to print the moving
> image parameters on each iteration, in addition to the cost function.
> On Nov 27, 2013 5:42 PM, "Hana Cherif" <hanacherif62 at gmail.com> wrote:
>
>>
>> Hello every body !
>>
>>
>> After execution of my images' registration program , using this
>> components:
>>
>> Regular Step Gradient Descent Optimizer,
>> Mean Squares Image  To Image Metric
>> Bspline interpolator
>>
>>  I get this results::
>>
>>
>> Iteration number:     Cost function value
>>
>>
>> 0                        2732.74
>> 1                        2700.84
>> 2                        2699.27
>> 3                        2701.48
>> 4                        2703.19
>> 5                        2700
>> 6                        2704.12
>> 7                        2705.1
>> 8                        2705.27
>> 9                        2705.4
>> 10                        2702.91
>> 11                        2705.15
>> 12                        2713.1
>> 13                        2720.48
>> 14                        2720
>> 15                        2715.81
>> 16                        2704.64
>> 17                        2687.46
>> 18                        2666.14
>> 19                        2639.91
>> 20                        2613.11
>> 21                        2587.55
>> 22                        2564.89
>> 23                        2546.22
>>
>> I use this parameters:
>>  optimizer->SetMaximumStepLength(0.10 );
>>  optimizer->SetMinimumStepLength( 0.05);
>>  optimizer->SetRelaxationFactor(0.5);
>>
>> My question is : as you see i the results the value of the cost function
>> increases i want to know why can be the reason of this results please!! is
>> it just a probleme of parameters??
>>
>> Thanks !
>>
>>
>>
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