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ivibr8

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Reply with quote  #1 
Most of us are familiar with the relatively new amplified motion technology that has been posted in the past and presented at various PdM conferences.

I just came across a similar product but what really impresses me is that it can apparently utilize standard video cameras as the source.  See example here

https://www.prdistribution.com/news/motion-vibration-tracking-using-dragonvision-video-deflection-technology/4923489

I've been in contact with the local Erebssed representative to see if I could get additional information on cost and effectiveness. Will post again as I gain more information

Jim P
Alex

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Reply with quote  #2 
There is one key factor in the measurement process and that is frame rate. So you can use some mobile phone camera at 30 FPS, but then you are limited up to 15 Hz. Sure you can buy some better phone with higher frame rate, but the price could exceed the price of industrial purpose cameras. There is also a question how the standard camera saves the signal, I know many of the phone cameras change the signal form while saving. Although the competition in that field is welcome. It will lower the product price which is (too) high.
Curran919

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Reply with quote  #3 
240fps has been standard for a few years. 960fps is now on most flagship phones, though it appears to only be truly 480fps. That is still more than enough for the uses of machine vision.
Alex

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Reply with quote  #4 
And the money for the 960 fps phone is..................?
The possibility that the phone doesn't autom. save in slow motion is................?
How much phones do you know to save in true monochrome................?
Curran919

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Reply with quote  #5 

Quote:
Originally Posted by Alex
And the money for the 960 fps phone is..................?
The possibility that the phone doesn't autom. save in slow motion is................?
How much phones do you know to save in true monochrome................?


Hey! You said there was one key factor! Don't bring more factors into it! LOL.

  • About 3% the price of an RDI system
  • Is this relevant at all? You don't use machine vision during transients. Obviously there will always be user errors.
  • I wouldn't call true monochrome necessarily an advantage.

......................................!
Alex

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Reply with quote  #6 
- I was not talking about RDI system. I was talking about price comparison between mobile phones with mentioned characteristics and the industrial high speed camera such as Grasshopper which is used by RDI.
- Yes it is. How would you FFT analyse the movie saved as slowmotion? Would you say to your customer: this peak is on 4 Hz, but for real it is on 16 Hz?
- RDI says the opposite, but I soon realized you know more than that
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fburgos

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Reply with quote  #7 
what is true monochrome and what is it's advantage?

I tought the monochrome was about the fast speed sensor is monochrome.... not a feature
Alex

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Reply with quote  #8 
Fburgos, you can have let's say Samsung galaxy S9 which enables slow motion videos at 960 fps. I don't know if it offers monochrome video (first problem) but I was told that video saving on the phone is customized to be most effective in the conditions of phone characteristics. That simply means you don't get a good video quality because of compression etc...
So I was talking about industrial cameras that preserve video signal in its prime form. A computer needed for such camera recording must have very good characteristics, just look at the IRD computer characteristics. That is why those video files are many many times larger than those from the phone.
fburgos

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Reply with quote  #9 
Ok so it's about the bandwidth of data not about monochrome is best or technical better than full color (three times bigger bandwidth)
Alex

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Reply with quote  #10 
Computers have always ˝liked˝ grayscale more than color, you know what I mean [wink]
MarkL

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Reply with quote  #11 
The price I was quoted dragon vision I wouldn’t care, it’s almost 70% less the price of rdi setup and from what I’ve seen at the price point would be more than enough to get me interested.
Curran919

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Reply with quote  #12 
Quote:
Originally Posted by MarkL
The price I was quoted dragon vision I wouldn’t care, it’s almost 70% the price of rdi setup and from what I’ve seen at the price point would be more than enough to get me interested.


The dragon vision is $18k?!
MarkL

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Reply with quote  #13 
The RDI must have got a lot more expensive than I was last quoted if thats the Case Curran.

Edit-
I see where you may have mistook me, 
I meant that the dragon vision was 70% less the price of the RDI.

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