[Insight-users] fast binary dilate image filter

[Gaetan Lehmann]

Hi Jerome,

I'm again working on binary dilate filter.

I don't understand what the last part of the code is for.

  while( !ouRegIndexIt.IsAtEnd() )
    {
    // Retrieve index of current output pixel
    IndexType currentIndex  = ouRegIndexIt.GetIndex();
    for( vecIt = vecBeginIt; vecIt != vecEndIt; ++vecIt )
      {
      // Translate
      IndexType translatedIndex = currentIndex - *vecIt;
 
      // translated index now is an index in input image in the 
      // output requested region padded. Theoretically, this translated
      // index must be inside the padded region.
      // If the pixel in the input image at the translated index
      // has a value equal to the dilate one, this means
      // that the output pixel at currentIndex will be on in the output.
      if( inputRegionForThread.IsInside( translatedIndex ) && 
input->GetPixel( translatedIndex ) == foregroundValue )
        {
        ouRegIndexIt.Set( foregroundValue );
        break; // Do not need to examine other offsets because at least one
        // input pixel has been translated on current output pixel.
        }
      }

    ++ouRegIndexIt;
    progress.CompletedPixel();
    }



In fact, if I drop this part, I get the same output image. Can you explain me 
the role of this code ?

Thanks,

Gaetan

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