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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: NDCodec Compression Factor |
| From: | Mark Rivers via Tech-talk <tech-talk at aps.anl.gov> |
| To: | "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>, "Smith, William" <william.smith at helmholtz-berlin.de> |
| Date: | Tue, 22 Mar 2022 13:10:44 +0000 |
|
Hi Will,
Note that the current location of the documentation is here: https://areadetector.github.io/master/ADCore/NDPluginCodec.html
Please send screenshots of your simDetector configuration, e.g. simDetector.adl and simDetectorSetup.adl. The performance you are seeing would be consistent with a non-zero value of the Noise parameter.
Mark
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Smith, William via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, March 22, 2022 2:03 AM To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov> Subject: NDCodec Compression Factor Hi,
I have been revisiting using the NDCodec plugin in areaDetector. I noticed that when I try to repeat the example shown here https://cars9.uchicago.edu/software/epics/NDPluginCodec.html under “Screen Shots” with the following parameters plugin
#NDCodecConfigure(const char *portName, int queueSize, int blockingCallbacks, const char *NDArrayPort, int NDArrayAddr, int maxBuffers, size_t maxMemory, int priority, int stackSize)
NDCodecConfigure("CODEC1", 20, 0, "SIM1", 0, 0, 0, 0, 0, 5)
With the same settings as is shows in the example:
Compressor: Blosc Blosc Compressor: ZSTD Blosc Comp. Level: 5 Blosc Shuffle: Bit Blosc num threads: 6
I can only achieve compression of something like 1.3 not 151.35 as is shown in the example. What might I be doing wrong?
If I use JPEG compression I can achieve higher compression ratios, e.g with JPEG quality set to 10 I get compression factor of 81.5. With anything other than JPEG, for all combinations of settings I get roughly the same compression factor between 1 and 2.
The input image is coming from the sim detector. I am using a 1024x 1024 image of UInt8 which is a single peak centred about (500,500).
There is no codec error shown. I get no error in the ioc shell.
Many thanks,
Will
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V. Aufsichtsrat: Vorsitzender Dr. Volkmar Dietz, stv. Vorsitzende Dr. Jutta Koch-Unterseher Geschäftsführung: Prof. Dr. Bernd Rech, Thomas Frederking Sitz Berlin, AG Charlottenburg, 89 HRB 5583 Postadresse: Hahn-Meitner-Platz 1 14109 Berlin Deutschland |