Use of Erosion Filter

[georg.viehoever]

Hi,

I would like to apply an ErosionFilter (http://pixinsight.com/developer/pcl/doc/html/classpcl_1_1ErosionFilter.html) to a 3x3 neigbourhood in a whole image.

- From the documentation, it is not clear to me how to best do this, since it appears to work on a linear memory region (which 3x3 pixel data is not).
- Do I always have to copy the data in a suitable layout? How to handle the border of an image?

Thanks.
Georg

[Carlos Milovic]

Hi Georg

This code is for a median filter, but is quite the same thing for erosion.

Code: [Select]

void NoiseReduction( image_array ratio, pcl_bool issmall )
{
MedianFilter M;
BoxStructure sK(3);
BoxStructure lK(5);

MorphologicalTransformation MT(M,sK);
if (!issmall)
MT.SetStructure( lK );

for (int i = 0; i < ratio.Length(); i++)
MT >> ratio[i];

    Console().Flush();
    ProcessInterface::ProcessEvents();
}
You just have to change "MedianFilter M;"  for "ErosionFilter M;" and you are ready to go. They are all defined in MorphologicalOperator.h. Also, look at the StructuringElement.h file for the predefined shapes.

[georg.viehoever]

Thanks !  8)
Just what I need.
Georg