[ITK-users] HistogramEqualization in ITK

[Francois Budin]

Correction on the last line of what I sent:
    itk.ImageFileWriter.New(myFilter,FileName=filename).Update()

On Thu, Apr 13, 2017 at 9:06 AM, Francois Budin <francois.budin at kitware.com>
wrote:

> Hello Wang,
>
> One good way to explore the parameters to figure out which set gives you
> the result you want would be to write a short Python script:
> reader=itk.ImageFileReader[itk.Image[itk.UC,2]].New(
> FileName="/home/fbudin/Downloads/chest.png")
> myFilter=itk.AdaptiveHistogramEqualizationImageFilter.New(reader)
> for alpha in range(0,11):
>   for beta in range(0,11):
>     myFilter.SetAlpha(alpha*.1)
>     myFilter.SetBeta(beta*.1)
>     filename="/tmp/myFilter"+str(alpha)+"_"+str(beta)+".png"
>     itk.ImageFileWriter.New(hm,FileName=filename).Update()
>
> I was not able to generate an image that looked exactly like the "opencv"
> image you sent, but that may be due to:
> -The implementation of this algorithm in OpenCV is different
> -The difference of the output is only due to different visualization
> parameters (Window/Level settings that are different for the different
> images).
>
> Hope this helps,
> Francois
>
> On Thu, Apr 13, 2017 at 8:25 AM, wangtaoiz <wangtao_ at sjtu.edu.cn> wrote:
>
>> Dear all
>>   I want to use itk::AdaptiveHistogramEqualizationImageFilter to do a
>> HistogramEqualization filter on a image as follow:
>> <http://itk-users.7.n7.nabble.com/file/n38108/snipaste20170413_200959.png
>> >
>> So I set the parameters SetAlpha(0.5), SetBeta(0.5), the result is as
>> follow:
>> <http://itk-users.7.n7.nabble.com/file/n38108/snipaste20170413_201446.png
>> >
>> but actually the result I want is showed as follow (which is generated by
>> opencv cvEqualizeHist() function):
>> <http://itk-users.7.n7.nabble.com/file/n38108/snipaste20170413_201132.png
>> >
>> So I want to ask you if I can get that HistogramEqualization result by
>> ITK?
>>
>> Thanks a lot
>> Wang
>>
>>
>>
>> --
>> View this message in context: http://itk-users.7.n7.nabble.c
>> om/HistogramEqualization-in-ITK-tp38108.html
>> Sent from the ITK - Users mailing list archive at Nabble.com.
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