Hi Han,<br><br>Reading pixels values from an image using a const iterator shouldn't change the pixel values in that image.<br><br>1) What are you using to visualize your image ?<br>2) Is visualization the only mean that led you to conclude that your image is brighter ?<br>
3) Have you computed (objective) intensity statistics with the ImageCalculator or<br> with the StatisticsImageFilter ?<br><br><br>Please post your code...<br><br><br> Thanks<br><br><br> Luis<br><br><br>---------------------------------------------------------<br>
<div class="gmail_quote">On Thu, Jan 22, 2009 at 8:32 PM, Han D. F <span dir="ltr"><<a href="mailto:jlu_hdf@126.com">jlu_hdf@126.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div> </div>
<div> hello ,</div>
<div> </div>
<div>I just use </div>
<div>
<p>itk::ImageRegionConstIterator</p>
<p>ImageRegionIterator</p>
<p>to connect two 3d volumes to one 3d volume</p>
<p> I find the original iamges are more bright than the new volume.</p>
<p>I can not explain the fact.</p>
<p>The original images are 16 bit unsigned short. as</p>
<p><font color="#0000ff">typedef</font> <font color="#0000ff">signed</font> <font color="#0000ff">short</font> InputPixelType;</p>
<p><font color="#0000ff">typedef</font> <font color="#0000ff">signed</font> <font color="#0000ff">short</font> OutputPixelType;</p>
<p><font color="#0000ff">const</font> <font color="#0000ff">unsigned</font> <font color="#0000ff">int</font> Dimension = 3;</p>
<p>I also define the input and output image type as unsigned short.</p>
<p>if there is something i missing?</p>
<p>why they are different?</p>
<p>best</p>
<p>hdf</p>
<p> </p>
<p> </p></div><br><br><span title="neteasefooter"><hr>
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<br></blockquote></div><br>