[Octave-patch-tracker] [patch #8612] impyramid.m for image package

[Carnë Draug]

Update of patch #8612 (project octave):

                  Status:                    None => Done                   
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #6:

> When I look at the Matlab documentation for impyramid (see
http://de.mathworks.com/help/images/ref/impyramid.html ) then I read
"Reduction and expansion take place only in the first two dimensions."
>
> To me this says that it is alright to always do the reduction and filtering
process ONLY to the dimensions 1 and 2 of any given input. The other possible
dimensions should probably be kept intact during this procedure. But in Matlab
this function impyramid is NOT ment to reduce an ND image along the third or
fourth dimension at all! 

You are right. I missed that note on the Matlab documentation. So we 're kinda
limited there.

I have pushed the original function (after small style changes):

http://hg.code.sf.net/p/octave/image/rev/1f6389a88846

I then replaced the usage of imfilter with padarray and convn so it accepts
arrays of any dimensions (but still only reduces/expands) the first 2.

http://hg.code.sf.net/p/octave/image/rev/460dfaf2673c

I then added a bunch of more tests.

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