Image Input and Output

AMMA now includes a comprehensive mechanism for reading and writing objects from and to files in a uniform and transparent fashion. It is based around two global functions: Load and Save. In particular, there is a set of routines to handle a variety of image file formats, together with the ability to convert between several different pixel representations.

The generic load/save mechanism is described here. In order to invoke the libraries specific to image I/O, you need to:

• insert this header file:

  #include "amma/DP/FileFormatIO.hh"
  

• add this library in the defs.mk:

  USESLIBS = DPImageIO ....
  

The generic load/save call can then be used in the usual way, either by declaring the namespace:

ImageC<RealT> im;
using namespace StdIO;
Load ("fred.pgm", im);

StdIO::Load ("fred.pgm", im);

To find what file formats and conversions are available, use the /vol/vssp/local/amma/bin/conv tool, with the following options:

-lf - list all known file formats

-lc - list all known conversions

-lt - list all known classes (?)

Creating image converters

ImageC< DoubleImageValueT> DPConvByteImageCT2DoubleImageCT(const ImageC< ByteGreyValueT> &dat)  
{ 
  ImageC< DoubleImageValueT> ret(dat.Rectangle());
  for(Image2IterC< DoubleImageValueT,ByteGreyValueT> it(ret,dat);it.IsElm();it.Next()) 
    it.Data1() = (DoubleImageValueT) it.Data2();
  return ret;
}

DP_REGISTER_CONVERTION(ByteImageCT2DoubleImageCT, 1);

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