infinitenothing
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Everything posted by infinitenothing
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IMAQdx session "Attribute updated" event
infinitenothing replied to _Mike_'s topic in Machine Vision and Imaging
Many cameras have a soft trigger function. Maybe you could count images vs soft triggers before the exposure change to figure out the exposure of each image. -
How about this:
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I'd like it if my test stations sent their test results to a web server. I'm wondering if anyone has done this. As I see it, I can probably do some port forwarding and expose a Maria/MySQL database over the internet or I could give that database a thin web interface and send the data over PUSH http requests. Are there pro/cons to one over the other? TLS is an option for either. Do you think HTTP would be more firewall friendly?
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It's always a project by project decision for me. If I need the flexibility, I'll go TS. Otherwise, it's not worth the deployment licensing hassle. Another advantage to rolling your own is you get to use LabVIEW's block diagram representation of the sequence. It's a great visual—things in parallel execute in parallel. Data flows on wires. What can I say?
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How to let the user use buttons when in the event structure
infinitenothing replied to takanoha's topic in LabVIEW General
FYI, regarding FP locking in event case: http://zone.ni.com/reference/en-XX/help/371361K-01/lvhowto/lock_fp/ -
Event structure and case structure in the same loop
infinitenothing replied to takanoha's topic in LabVIEW General
Everything in the loop must complete before it can run again. Therefore, if the case structure is in the same loop as an event structure, they have a relationship and aren't really independent. -
No not programmable I've never had a problem with self heating but I've always had really good dissipation. I think if you need a lower current, you can use the half bridge method others linked to or a programmable current source like the 9265 with a second analog input module.
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Why do you say the current would be too high with a 9219? The user manual say it would apply 2.2V which would be 400uA. I guess if you wanted a lower current you could get a current source module and measure the resulting voltage with an analog input card to get resistance.
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Background correction and normalized image
infinitenothing replied to Shaun07's topic in LabVIEW General
Try right clicking, saving the image to disk, and then drag the saved file from explorer to your block diagram. The snippet is in 2017 so if you need an earlier version you might have to ask someone to down convert it or... there's not that many blocks there, maybe you can try and recreate it.- 10 replies
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- laser beam profile
- machine vision
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LabVIEW 2017 Dynamic Event Registration Behaviour
infinitenothing replied to ShaunR's topic in LabVIEW Bugs
I guess this is a "what's new in LV" thread now. There are some performance improvements in the conditional indexing tunnels on a for loop. I think it allocates the max size and trims it at the end. The async tools are also a huge performance increase over the old VI server method. Also, DVRs now allow parallel read access which is cool. The menu plugins provided many productivity improvements. VIMs make reuse easier. Regarding the new dynamic refnum behavior, does everyone agree that the right terminal is more or less obsolete and could probably be replaced with something like a linked tunnel? Am I misunderstanding the new behavior? -
Object Names for controls in Squish (GUI Tester)
infinitenothing replied to David_L's topic in LabVIEW General
Even VI server is going to have some drawbacks like accessing latching booleans and whatnot. If anyone has and idea exchange post in support of automated GUI test, I'd kudos it. -
Background correction and normalized image
infinitenothing replied to Shaun07's topic in LabVIEW General
My example uses the second technique (subtracting a constant at IMAQ Subtract). Where are you getting these requirements from? Also, it's nice if you let us know where you've cross posted this so we don't duplicate efforts https://forums.ni.com/t5/LabVIEW/calculate-1-e-2-of-beam-intensity-profile-Measurement/td-p/3766062/page/2 https://forums.ni.com/t5/LabVIEW/Background-correction-and-Normalizing-Image/m-p/3766148#M1060967- 10 replies
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- laser beam profile
- machine vision
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Background correction and normalized image
infinitenothing replied to Shaun07's topic in LabVIEW General
That's a snippet so in theory, you should be able to just drag it into your block diagram negating the need for a VI file- 10 replies
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- laser beam profile
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Background correction and normalized image
infinitenothing replied to Shaun07's topic in LabVIEW General
Something like this?- 10 replies
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LabVIEW 2017 Dynamic Event Registration Behaviour
infinitenothing replied to ShaunR's topic in LabVIEW Bugs
The current behavior looks like the incoming reference on the left terminal overrides the previously "wired from the inside" right terminal. If that's the intended behavior, I feel like the the "right" terminal is now obsolete because of linked tunnels. -
Not sure if we're still doing this but there's another subform for ideas: https://lavag.org/forum/37-labview-feature-suggestions/
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- run once
- labview fpga
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Are you looking for an automated tool or free labor? If it's the former, I don't know of one.
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Maybe: http://zone.ni.com/reference/en-XX/help/371361H-01/lvhowto/hex_display/
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Examples on Classifier engines
infinitenothing replied to Yamada's topic in Machine Vision and Imaging
Is this what you're looking for? http://zone.ni.com/reference/en-XX/help/372916J-01/nivisionconcepts/supportvectormachines/ -
Have you tried the express VI? It looks like you don't need a shifter.
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Vision generate .exe file about camera seek
infinitenothing replied to 花落阳关's topic in LabVIEW General
I don't entirely understand what you're getting at. When you say "searching the camera" are you talking about using something like IMAQdx Enumerate Cameras? And when you say "autorun to acquire figures" do you mean you're looking to use dataflow to delay when some events happen? That seems like a general purpose labview question and not a vision question. You'll probably want to use a sequence structure or a queue. -
I'm not sure what the myRIO has built in (USBtoSerial drivers built in? CLIP?) but if you had to, you could always just program the FPGA and use a level shifter:
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Possible bug with search 1D array of refnum
infinitenothing replied to Dan Press's topic in LabVIEW General
I'm guessing that's intended behavior since the two references are "equal" (see below). The problem is "when are two references equal". Different people might have different answers. It's too bad you can't "override" the equivalence operator with a functor replacing the "heart of the algorithm" -
It's a personal preference but I don't like using delete array for that purpose because I think it's confusing. I'm sure it costs me a few milliseconds when I see it and think "why would I want to delete an element from that array?" We want code that's easy to read not easy to write right?