[Insight-developers] towards fixing bug: 9212: Exception when reading 3D image into a 2D image

[Bradley Lowekamp]

Hello,

	I am working on fixing the bug. In ImageFileReader I need to  
calculate the size of the IO buffer based on the IORegion, and I am  
missing some function or access to the information I need. I am  
proposing adding public methods to ImageIORegion and ImageIOBase:

1)

   /** Get the number of pixels contained in this region. This just
    * multiplies the size components. */
   unsigned long itk::ImageIORegion::GetNumberOfPixels( void ) const;

This methods is just copied from the ImageRegion.

2)

To calculate the buffer size I need the number of pixels and the size  
of the pixels (or the size of the components and the number of  
components). Currently, the methods ImageIOBase::GetPixelStride is  
public, but this methods need to have ComputeStride called for it it  
be useful. ( I actually think this methods should still be private ).  
We already have GetNumberOfComponents, GetImageSizeInBytes,  
GetImageSizeInPixels, and
GetImageSizeInComponents. But no way to access the size of a pixel or  
component (unless you for GetImageSizeInBytes/GetImageSizeInPixels,  
ick). I propose changing the following methods from protected to public:

   /** Compute the size (in bytes) of the pixel. For
    * example, and RGB pixel of unsigned char would have size 3 bytes.  
*/
   virtual unsigned int GetPixelSize() const;

   /** Compute the size (in bytes) of the components of a pixel. For
    * example, and RGB pixel of unsigned char would have a
    * component size of 1 byte. This method can be invoked only after
    * the component type is set. */
   virtual unsigned int GetComponentSize() const;


Thanks for your comments,
Brad





========================================================
Bradley Lowekamp
Lockheed Martin Contractor for
Office of High Performance Computing and Communications
National Library of Medicine
blowekamp at mail.nih.gov


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