<br>Just a quick follow up on our discussion regarding the performance<br>of conversion between color systems.<br><br>Here is a profile that we got for another project where we are using the<br>FFMPEG library for compressing and decompressing video sequences.
<br><br><br>In that particular case we have:<br><br>1) Image size 1024 x 768 pixels, greyscale, 1 byte per pixel<br><br>2) Computer<br>2.1) Dell Precision 450 workstation<br>2.2) with dual processor Intel Xeon at 2.4GHz
<br>2.3) with 3Gb of RAM<br>2.4) Linux Debian<br>2.5) Using the gcc compiler with -O3<br><br><br>With this configuration it takes 30 milliseconds to do <br>the following:<br><br>0) Copy the input image into another buffer
<br>1) Convert the grayscale image into YUV,<br>2) Compress the image using the Flash video codec<br>3) Decompress the image using the Flash video codec<br>4) Convert the decompressed image back from YUV to grayscale.<br>
<br><br>We have not profiled the conversion in isolation, but the <br>fact that two color format conversions plus video <br>compression and decompression fit in 30 milliseconds, <br>give us some indication on how much the color format
<br>conversion alone could take.<br><br><br> Luis<br><br><br><br>---------------------------------------------------<br><div><span class="gmail_quote">On 3/29/07, <b class="gmail_sendername">Patrick Cheng</b> <<a href="mailto:cheng@isis.georgetown.edu">
cheng@isis.georgetown.edu</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi everybody,<br><br>Here is the minutes for discussion on VideoGrabber continued from last week:
<br><br><a href="http://public.kitware.com/IGSTKWIKI/index.php/Minutes_032907">http://public.kitware.com/IGSTKWIKI/index.php/Minutes_032907</a><br><br>Patrick<br>_______________________________________________<br>IGSTK-Developers mailing list
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</a><br></blockquote></div><br>