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Eeg Viewer seems filtered even if filter setting is off. #413

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
In the attached screenshot, the Matlab graph shows Grid02 from Study034 from a 
2713Hz file. The IEEGViewer is supposed to have the data at 5000Hz but looks 
more filtered than the Matlab figure. Filter setting is on interpolation only.

This is consistent with what Bill Stacey found last week.

Original issue reported on code.google.com by JBWagenaar on 17 May 2013 at 6:12

Attachments:

GoogleCodeExporter commented 9 years ago 
Merging to this issue:

1. Load I007 rat data (32KHz)
2. Change filter to "linear interpolation"

The dygraph still substantially downsamples the plot. (I like this, but it's 
very misleading to users.) Compare the attached busy raw signal from MATLAB vs 
dygraph doing its maximally "busy" lin interp. Dygraph actually initially 
flashes the whole busy signal on screen, but settles on the sub. Could be that 
it adjusts for user screen resolution.

Original comment by echa...@gmail.com on 2 Jul 2013 at 3:36

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GoogleCodeExporter commented 9 years ago 
I know I talked with Zack about this. The reason it looks different is that the 
portal sends one value per horizontal pixel to the browse whereas matlab 
renders multiple pixels per horizontal pixel. One way to deal with this is to 
send a maximum and minimum per horizontal pixel instead. However, this requires 
some processing and doubles the amount of data that will be send to the portal.

Original comment by ieegpor...@gmail.com on 2 Jul 2013 at 3:47

GoogleCodeExporter commented 9 years ago 
Issue 381 has been merged into this issue.

Original comment by samd.p...@gmail.com on 24 Jul 2013 at 12:54

GoogleCodeExporter commented 9 years ago 
I believe this is the same issue that is also in 438 etc.

Original comment by zack.i...@gmail.com on 11 Oct 2013 at 5:02