[vtkusers] Readers read image with some kind of reveral?

[ChenDawnWind]

Thanks.But even if i set up FileLowerLeftOn. The contour still fliped.Here are the codes i used, is there any problem? 
	vtkSmartPointer<vtkJPEGReader> jpegReader =		vtkSmartPointer<vtkJPEGReader>::New();  	jpegReader->FileLowerLeftOn();	jpegReader->SetFilePrefix("C:/Users/DawnWind/Desktop/000/");	jpegReader->SetFilePattern("%s%d.jpg");	jpegReader->SetDataByteOrderToLittleEndian();	jpegReader->SetDataSpacing(2.0 / 3, 2.0 / 3, 1); 	jpegReader->SetFileNameSliceSpacing(1); 	jpegReader->SetDataExtent(0, 209, 0, 209, 0, 0);	jpegReader->Update(); 

The full codes please see the attachments in
Re: [vtkusers] vtkPointWidget set the right position‏from Chen DawnWind (cybfly1 at hotmail.com)
Thanks.
DawnWind.ChenCSU

> From: david.gobbi at gmail.com
> Date: Tue, 16 Apr 2013 15:30:34 -0600
> To: vtkusers at vtk.org
> Subject: Re: [vtkusers] Readers read image with some kind of reveral?
> 
> On Tue, Apr 16, 2013 at 10:17 AM, David Doria <daviddoria at gmail.com> wrote:
> > On Tue, Apr 16, 2013 at 11:45 AM, ChenDawnWind <cybfly1 at hotmail.com> wrote:
> >> Hi everyone,
> >> when i use the reader such as vtkJPEGReader to read one image file(see
> >> attachment) and extract the contour of
> >> the img, then read the result output and print the points with OpenCV.
> >> Then i found the image was not the way it used to be.
> >> In the attachment the original image is number 1, and the contour image is
> >> number 2.
> >> It is clear that the image reversal in some way.
> >> Cause i have to set the point of the contour in the 3D model,
> >> with this revesal the calculated center of the white target in the the
> >> original image was not suit the reveral image 2.
> >> So i wanna know is there any way to avoid this revesal and to read file as
> >> it used to be?
> >> Thanks!
> >>
> >> DawnWind.Chen
> >> CSU
> >
> >
> > It looks to me like you are just viewing the points from a different
> > viewpoint. If you want to change the view on the VTK side of things,
> > check out:
> > http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/vtkCamera
> >
> > for how to position and aim the camera.
> >
> > David
> 
> I don't think this is a camera issue.  The vtkJPEGReader does in fact
> flip the image.  In JPEG the first pixel is at the upper left corner
> of the image, while VTK's 2D coordinate system (the one used for
> vtkActor2D) has the first pixel at the lower left corner of the
> renderer.  The reader flips the image so that it appears the right way
> up on the screen when displayed with vtkImageViewer.  This flip of
> course means that the coordinates of any points that you get from
> contouring the image will be flipped top-to-bottom.
> 
> For some readers, you can call FileLowerLeftOn() to stop the reader
> from flipping the image.
> 
>  - David
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