[Insight-users] Re: Importing image data from a byte array

[Chris Farmer]

Hi.  I've seen all the ImageFileReader stuff, but I don't have a file,
and I'd prefer not to create one.  Ever.  I've built the source tree and
have run many of the examples, and I can certainly get my example PNG
files into an itk Image and back out again in any of various formats
using the standard reader/writer classes.  Maybe I'm pre-optimizing
unnecessarily here, but it seemed reasonable to me to expect that I
could just use my in-memory representation of a PNG in one way or
another.  In the application I'm trying to put together, throughput is
probably the most important factor, so writing a potentially large
buffer to a file just so I can read it again into some other buffer
seems quite wasteful.

Thanks,
Chris


 

-----Original Message-----
From: Andinet Enquobahrie [mailto:andinet.enqu at kitware.com] 
Sent: Wednesday, September 07, 2005 3:56 PM
To: Chris Farmer
Cc: insight-users at itk.org
Subject: Re: [Insight-users] Re: Importing image data from a byte array

Chris Farmer wrote:

>This makes perfect sense.  I was trying this since others suggested the
>ImportImageFilter as a way to get PNG data into an itk image.  Now I'm
>back to square one... is there a straightforward way to get PNG data
(or
>some other non-raw image format) from a byte array into an itk Image?
>
>
>  
>
All you need is

typedef itk::Image<PixelType, Dimension> ImageType;
typedef itk::ImageFileReader <ImageType> ReaderType;
ReaderType::Pointer reader = ReaderType::New();
reader.SetFilename(inputFilename);
reader->Update();

// The ImageFileReader class determines the image format from the file 
extension and then points to the approrpriate ImageIO

There is a whole chapter on data representation  in the ITK software 
guide. You might want to take a look at that for detailed explanation.

http://www.itk.org/ItkSoftwareGuide.pdf

and there are several IO examples in the main source tree

Insight/Examples/IO

-Andinet



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