As you iterate the image, check to see if you're on the grid. If you are, then set and iterate the neighborhood. Something like:<div><br></div><div>while(!it.IsAtEnd())</div><div> {</div><div> index = it.GetIndex();</div>
<div> if( (index[0] % 2 == 0) && (index[1] % 3 == 0) ) // or whatever</div><div> {</div><div> neighborhoodIt.SetLocation(index);</div>
<div> // iterateTheNeighborhood</div><div> .</div><div> .</div><div> .</div><div> }</div><div><br></div><div> ++it;</div><div> }<br><br><div class="gmail_quote">On Wed, Feb 16, 2011 at 12:40 PM, linjiao <span dir="ltr"><<a href="mailto:jiao.lin@gmail.com" target="_blank">jiao.lin@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Have a question regarding neighborhood iterator. My understanding is that<br>
after creating a neighborhood iterator, one can move the center of a<br>
neighborhood around an image region by increment the iterator:<br>
<br>
while (!it.IsAtEnd()) {<br>
...<br>
++it;<br>
}<br>
<br>
Each increment will bring the center to the next pixel in the image region.<br>
I am now wondering if it is possible to define a "grid" in the image region,<br>
and only let the center to move to the next pixel in that grid.<br>
<br>
So for example, we have a 10X10 image, right now we can define a<br>
neighborhood iterator whose center walks like this<br>
<br>
(0,0), (1,0), (2,0), .... (9,0), (0,1), (1,1) ....<br>
<br>
I am wondering if we can define a neighborhood iterator whose center walks<br>
in 2 steps in x direction, and 3 steps in y direction<br>
<br>
(0,0), (2,0), (4,0), ... (8,0), (0,3), (2,3), (4,3), ...<br>
<br>
Any hints are very appreciated.<br>
<br>
--Jiao<br>
--<br>
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