[Insight-users] How to sum pixels row-by-row?

[Ali -]

What is the best way of summing an image row-by-row? The slice-by-slice class provided in the insight journal is great, however, it does not allow input and output of different sizes. It is strange how ITK can perform so many elaborated image processings, but it takes hours to figure out how to implement some elementary matrix manipulations. I thought the inclusion of VXL in ITK means having a fast MATLAB-style image processing toolkit in c++.
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