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Re: [Imgcif-l] High speed image compression
- To: The Crystallographic Binary File and its imgCIF application to image data <imgcif-l@iucr.org>
- Subject: Re: [Imgcif-l] High speed image compression
- From: Nicholas Sauter <nksauter@lbl.gov>
- Date: Thu, 28 Jul 2011 12:06:28 -0700
- In-Reply-To: <4E31AE8C.8040405@rayonix.com>
- References: <4E31AE8C.8040405@rayonix.com>
Justin, Just some comments based on our experience...first, I haven't tried the compression extensively, just the decompression. But I've found Graeme's decompression code to be significantly faster than the CBF library, first because it is buffer-based instead of file-based, and also because it hard-codes some assumptions about data depth. I'd be happy to examine this in more detail if there is some way to share your code example... Nick On Thu, Jul 28, 2011 at 11:46 AM, Justin Anderson <justin@rayonix.com>wrote: > Hello all, > > I have run Graeme's byte offset code on a 4k x 4k (2 byte depth) Gaussian > noise image and found it to compress the image in around 150 ms (64-bit > RHEL, Pentium D 3.46GHz). Using CBF library with byte offset compression, I > find the compression takes around 125 ms. > > This will be too slow to keep up with our high speed CCD cameras. We are > considering parallelizing the byte offset routine by operating on each line > of the image individually. Note that this would mean that a given > compressed image would be stored differently than via the whole image > algorithm. > > Has anyone been thinking about this already or does anyone have any > thoughts? > > Regards, > > Justin > > -- > Justin Anderson > Software Engineer > Rayonix, LLC > justin@rayonix.com > 1880 Oak Ave. #120 > Evanston, IL, USA 60201 > PH:+1.847.869.1548 > FX:+1.847.869.1587 > > > _______________________________________________ > imgcif-l mailing list > imgcif-l@iucr.org > http://scripts.iucr.org/mailman/listinfo/imgcif-l > > -- Nicholas K. Sauter, Ph. D. Computer Staff Scientist/Engineer Physical BioSciences Division Lawrence Berkeley National Laboratory 1 Cyclotron Rd., Bldg. 64R0121 Berkeley, CA 94720-8118 (510) 486-5713 _______________________________________________ imgcif-l mailing list imgcif-l@iucr.org http://scripts.iucr.org/mailman/listinfo/imgcif-l
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