[vtkusers] Some problem in using vtkImageGradient

[wang minyou]

Hello Glen,

Thank you very much  for your help.
But SetNumberOfComponents() is not a member of vtkBMPReader. I found a 
similar function SetNumberOfScalarComponents() but the error remains. What 
do you think about that?

Wang

>From: Glen Lehmann <glehmann at imaging.robarts.ca>
>To: "wang minyou" <wmy1024 at hotmail.com>
>CC: Glen Lehmann <glehmann at imaging.robarts.ca>, vtkusers at vtk.org
>Subject: Re: [vtkusers] Some problem in using vtkImageGradient
>Date: Sun, 9 May 2004 09:48:03 -0400
>
>Hello Wang,
>
>I think that your bmpReader is assuming you have data with more than 
>1 component.  Try:
>
>bmpReader->SetNumberOfComponents(1);
>
>before you get the out put of the reader.
>
>Cheers,
>Glen
>
>On May 9, 2004, at 2:47 AM, wang minyou wrote:
>
>>Hello everyone,
>>I have some problem in using vtkImageGradient. According to the 
>>example in vtk-doc, I use vtkImageGradient to do image processing. 
>>But in runtime occurs some errors in vtkOutputWindow, which 
>>says:vtkImageGradient (019200A0): Execute: input has more than one 
>>components. The input to gradient should be a single component 
>>image. Think about it. If you insist on using a color image then 
>>run it though RGBToHSV then ExtractComponents to get the V 
>>components. That's probably what you want anyhow.
>>But I want to get the Gradient of the grey level of the image.How 
>>can I do that? Has anybody
>>done similar work before? Please help me.
>>Thank you very much!
>>some codes are as follow:
>>vtkImageGaussianSmooth* 
>>pGaussianSmooth=vtkImageGaussianSmooth::New(); 
>>pGaussianSmooth->SetInput(bmpReader->GetOutput()); 
>>pGaussianSmooth->SetStandardDeviation(1.0); 
>>pGaussianSmooth->SetDimensionality(2); 
>>pGaussianSmooth->SetRadiusFactors(10,10,0);
>>vtkImageGradient* imgGradient=vtkImageGradient::New();  
>>imgGradient->SetInput(pGaussianSmooth->GetOutput());  
>>imgGradient->SetDimensionality(2);
>>vtkImageMagnitude* imgMagnitude=vtkImageMagnitude::New();  
>>imgMagnitude->SetInput(imgGradient->GetOutput());
>>
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王敏尤
wmy1024 at hotmail.com

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