Philipp Fechteler
2008-Apr-11 21:55 UTC
[R] image processing and plotting at video rates ?
Hello R user
I am using R now for some time and I like it a lot. I just started a new
project where I am working with video streams at a resolution of 1024 x
768 pixels. I am reading the images out of a big raw file containing the
uncompressed data. I do this via "readBin".
As far as I have found out R has no build in support for image data to
plot. Looking at CRAN has brought up "biOps" with many basic features
for image processing as well as plotting. But the plotting speed quite
bad (for video). By just reading the image data out of the file and
plotting the image, without any further processing, I have frame rates
less then a single frame per second on a 2,4 GHz dual-core Pentium.
Here is the code I am using
for (i in 1:500)
{
img <- imagedata( array(numCols, numRows, 3),
type="rgb", ncol=numCols, nrow=numRows)
tmp <- readBin(inFD, integer(), numCols * numRows * 4, 1, FALSE)
img[,,] <- matrix(tmp, ncol=4, byrow=TRUE)[,1:3] #leaving out bgr[u]
# in future here will be a segmentation and tracking algorithm
plot( imgRotate90Clockwise( img ) )
}
Does anybody has a tip? Is there a better choice for video image
processing in R? Or, does native R support any internal speedup
possibilities?
Thank you for any help. Bye
Philipp
--
________________________________________________________________________
Dipl.-Ing. Philipp Fechteler
Department Image Processing
Fraunhofer Institute for Telecommunications
Heinrich-Hertz-Institut (HHI)
Einsteinufer 37
10587 Berlin, Germany
Phone +49 30 31002 616
Fax +49 30 31002 200
Email philipp.fechteler at hhi.fraunhofer.de
WWW http://iphome.hhi.de/fechteler
________________________________________________________________________
----
Visit us at
22. Treffpunkt Medizintechnik / Berlin, Germany / 22. May 2008
Lehrgebaeude der Charite Berlin / 9.00 - 17:30 Uhr
http://www.tsbmedici.de
ANGA Cable 2008 / Cologne, Germany / 27-29 May 2008 / Hall 10.3, Booth G38
http://www.angacable.com