Why do the results between the OCR in the Vision Assistant and a VI generated from the vision assistant might defer?

Hi everybody,
I had a problem while I was trying to run OCR on my image in my LabVIEW code. The algorithm did not detected what I was expecting on the image.
I decided to run the test on the vision assistant and it worked perfectly: I got the expected results.#
I assumed then that my code had different parameters, so I decided to generate a VI from the vision asssistant and run it on LabVIEW for the same image, just to verify.I did not change anything on the VI (all parameters are the same), and I used the same image. Surprinsingly the results are different between the assistant and the VI. That strikes me a lot! I have checked alll possible configurable parameters and they have the same values as in the Vision assistant. Does anybody have an idea about what could be the reason of this behaviour? Thanks
Regards,
Esteban

Hi Peter,
Strange. It runs here. Attached the screeshot you requested.
Regards,
Esteban
Attachments:
Capture.png ‏135 KB

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Why do the results between the OCR in the Vision Assistant and OCR in a VI generated from the vision assistant might defer?

Hi everybody,
I had a problem while I was trying to run OCR on my image in my LabVIEW code. The algorithm did not detected what I was expecting on the image.
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Regards,
Esteban

Esteban,
do you use the same images for OCR? Or do you take a new snap shot before running the OCR?
What steps of debugging did you use in LV?
Norbert
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

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sandoo8 wrote:
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Hi, it's me again. I swear, I must be destined to just use Windows machines...
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Why does the Ni-Motion Torque-Control Program give me such an oscillation???

Hello,
I really hope to find somee help here...I have a UMI-7744 and I would like to do force control for a servo motor. I have tried the NI-Motion example "Torque Cntrl Using Monitoring Force"...it seems to be quite easy - it constantly measures the current force and compares the ADC-values with the target force. The difference between the two is then new relativ position...
When I test it with an actuator that does not touch the workpiece (current force==>0N) and then tell it to apply 50N (ADC-value of ~1000) then of course it starts moving towards the workpiece, but then overshoots quite significantly when it touches it, then undershoots, then overshoots, then undershoots....etc....
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(2) I was assuming that the problem is because I load quite large relative positions (1000 - 0 = 1000) while the actuator is not yet in contact with the workpiece which then causes the overshoot when the actuator touches the workpiece. Hence, I tried limiting the relative positions to +/- 100, but it seems that it does not improve anything. The actuator still never maintains a steady force.Any idea, why limiting the relative positions does not have an effect on the oscillation??
(3) I have seen that the use a delay of 50ms. Hence every 50ms a new target position is loaded. Is there any experience of what the BEST time delay is for motion control???? Is it better to decrease the delay to adjust the relative position more often OR would this have negative effects because the moves don;t have enough time to complete??????
I am grateful for any reply...

Hi Jochen,
thanks for the clarification on the pros and cons of the two Torque control approaches...very enlightening......
To clarify my previous question: I am using the S200VTS-Servo Drive from Danaher Motion. The drive is able to run in Torque-mode, Velocity-mode and Position-mode. In the latter case it needs a "step and direction" input, instead of an analog input. My idea was to setup the S200-drive in Position-mode because in the "Torque Control using monitoring Force"-example the inner PID loop is for the position...so I thought, why shall I setup the S200-drive in torque mode, when actually the PID-loop tries to control the Position.....you know what I mean? It appeared to me, that with setting up the drive in torque mode and running the example code with the positional PID-loop I am mixing force and position....
Kind regards and thanks a lot for your efforts.
Well, let's take it like that: The second approach is ok, if the dynamics of the torque are very low. The worst case scenario for this approach is a solid actuator pressing against a solid workpiece. When these two pieces meet, a force occurrs almost instantaneously. That means, that very short move distances result in high force differences. With your current approach this means that it's very hard to control the force, as in fact the only way to generate force is to move the axis a bit. If you control the force directly instead (analog feedback), you will get a much better control behavior.
To clarify the idea behind that:
Just think of two metal plates lying on each other on the floor. Now you step on the upper metal plate. Does the upper metal plate move? No. Is there a change of the force applied to the lower plate? Yes.
To summarize: 'Torque Control using monitoring force' works best in systems with very low dynamics and a soft contact between actuator and workpiece. still all the limitations that I have mentioned in my first post are true, so I strongly recommend to use analog force feedback.
Your last statement about running the motor in position or torque mode is not clear to me. Are you referring to operation modes of your drive (by the way, which drive are you using?). In this case the clear recommendation is to configure your drive always in torque mode, regardless of the type of control provided by the 73xx device that you are using. From a drive's point of view 'torque mode' means, that the analog input voltage (command input) is converted into a proportional current signal and that's in both modes the best option.
Jochen

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Why is the AEBS bottlenecking my ReadyNAS devices leading to bad packets and TCP Retransmits?

Bad Packets Unrecovered TCP Retransmits TCP Retransmits w ReadyNAS NV NV+ and Airport Extreme Base Station 5th Generation
I got an Airport Extreme Base Station (AEBS), 5th generation this past November to bring my entire network up to gigE standards and extend my wireless range a bit. I have really liked the AEBS 5th Gen overall since I got it 3 months ago. It was easy to setup and update and things have been noticeably faster. I can also easily take my netbook, laptop, and iPad out to my shop some 80 feet away from my AEBS and still surf rather well wirelessly too. I couldn't do this even with my previous D-Link wireless-n setup.
In December I picked up an old ReadyNAS NV+ to go along with my old ReadyNAS NV. When I finally started to setup the new network for my business in February, I noticed in the logs that I was getting a large numbers of bad packets, TCP retransmits, and unrecovered TCP retransmits. Previously, I had never had errors of any sort with any older network setups using linksys, dlink and netgear routers during the last 6 years.
Eventually cables, switches, and routers can go bad which results in the errors I have been getting so I went through the "Troubleshoot My Performance Problem/Check for Network Errors" section of the link below to try and figure out what was causing my problem.
(http://www.readynas.com/?p=310#Troubleshoot)
My Initial Setup:
Airport Extreme Base Station (AEBS):
- 1 incoming Cat5e from Motorola Surfboard 6120,
- 2 Cat5e connections to my wifes work network with her business computer and VOIP phone.
- 1 Cat 5e interconnecting the AEBS to my wired network on the HP Procurve Switch.
The AEBS manages addresses via DHCP on my wired network for all of my devices on the HP Procurve 14008G Switch:
- 1 to NV
- 1 NV+
- 1 MacMini 2010
- 1 MacMini 2005
- 1 networked Epson R-3000 printer
1. Simple things first. Since I have always made all my own Cat 5e cable I figured I'd better get some better(?) cabling strait away. I went ordered new Cat 6 and Cat 6a cables to connect the NV, NV+, and my main Mac to the switch and connect the switch to the AEBS. The errors kept coming.
2. Then I separately connected each NAS unit directly to my computer by setting up the static IP on my computer first. Once I reconnected each ReadyNAS with the computer directly they defaulted to a static IP. Neither NAS had errors.
(http://sphardy.com/web/readynas/how-to-direct-connect-to-your-readynas/)
3. Errors were coming from either a bad Procurve 1400 switch or a bad AEBS. I hooked everything directly to my Airport Extreme and got lots of errors.
4. I decided to check the switch also. I altered each ReadyNAS's default static IP to one of my choosing individually. Then I hooked both ReadyNAS units to my HP Procurve 1400 switch. I hooked the switch directly to my computer and got no errors from either NAS. I continue to get no errors the next day.
5. When I first ran my tests I had Jumbo Frames turned Off. Currently, Jumbo Frames are On and there are still no errors and seems to be no slowness either.
Conclusion:
The Airport Extreme is the bottleneck causing the errors in my network.
Perhaps there is something I can alter which will rid me of the errors, but this type of error makes the AE seem to be pretty shoddy. A newer state-of-the-art router should not be bottlenecking my rather archaic slow network devices. Apparently, the 4th Gen AEBS's couldn't do Jumbo Frames, but this current model is supposed to, but I see no setting for changing the MTU.
Questions:
What could be causing the bottleneck?
Do I have a bad router?
How could I analyze this problem?
Has anyone else had similar issues and if so how were they resolved?
Current Setup:
All of my computers and NAS devices are hooked to my Procurve Switch each with its own Static IP.
The switch is working flawlessly with no Errors.
The network printer is now wireless and connected via the AEBS.
I am using wireless-n to connect to internet via the AEBS on my main machine.
I am sharing the internet connection with the other Mac Mini on the switch and any other machine I plug into the switch (not ideal).
Problem is:
I am not a systems administrator and don't really want to tinker with setting up Static IP's for the machines I hook and unhook to the switch.
I want the AEBS to manage addresses via DHCP so everything accessing my router will mindlessly be able to access all things on my network.
Can the AEBS be made to not produce errors or do I just have a lemon.

Hi Bob,
That's the strange thing. When I had both GHz channels working on one SSID, once in a while my iMAC would pick the 5 GHz channel (44 seems the best for me). I always use channel 1 for 2.4 GHz because I get the fastest speeds with it.
When the iMac would pick 5 GHz, the slowdown was very obvious. As I explained in my (long) first post, I immediately felt the difference. Now the $50K question - since the 5 GHz channel at that point was stronger than the 2.4 GHz one, why wasn't the speed faster? Why was it so slow compared to 2.4 GHz? That's what rattling my brain. If the 5 GHz signal's strong enough to get picked by my iMac, then why isn't there a commensurate speed increase? There must be something else going on here besides signal strength. If the 5 GHz spec says that I must have full strength to get 5 GHz speeds, then that makes sense. But I think it doesn't, that's why I believe I have a configuration problem somewhere, or a faulty AEBS.
I might add that my firmware's up-to-date in the AEBS and AX, and Airport Utility too.
I think heading to 4Runner's camp - even with high signal strength (and I would consider 3 of 4 bars high), the 5 GHz speeds aren't showing themselves.
Here's some snap's of my AEBX's setup:
I think my configuration's fine, although I've tried so many different options, I'm a little confused, but I know that changing the Multicast Rate doesn't have any noticeable effect on the speed. I also have "Use Wide Channels" checked, but as I said, the 5 GHz band is awfully slow for using both channels. I have set "N" only, so no "G" clients to slow it down.
Mind boggling!

MacBook Pro retina 13" (late 2013, Haswell) why is the highest resolution rendered in 3360x2100, which the system obviously can't handle?!

Hey Apple and Apple users,
I just recently switched from an MacBook Air (mid 2013) to the new Haswell MacBook Pro retina 13" (late 2013 model).
The main reason to do so was the better screen and the option to run higher scaled resolutions, as advertised.
I was willing to trade in the Air's low weight, smaller formfactor and the extra batterylife for the better screen.
When it comes to resolutions:
1280x800 is just a joke nowadays, why is the MacBook Pro still based on it? 13" and 1440x900 work quite fine...see MacBook Air.
1440x900 is okay in everyday life situations, but sometimes you just need "more space" as the third scaling option calls it as well in the display-settings.
1680x1050 on 13" can sometimes be challenging, but it is really fine if you need to work and have a lot UI elements to deal with (Photoshop etc.)
So 1680x1050 scaled on the 2560x1600 screen would be my daily driver for work. So I expected a scaling factor of "1.5238..." (2560/1680) will be used most of the time.
Frankly spoken...I am really disappointed by the 13" retina MacBook Pro and the way OS X Mavericks is handling the scaling.
It obiously works well and responsive with the 1280x800 non-scaling resolution ("best for retina, scaling factor 2: 1280 --> 2560).
Is still "okay-snappy" at 1440x900 (scaling factor 1.777...: 1440 --> 2560).
But it totally breaks down at 1680x1050 (scaling factor 1.523...: 1680 --> 2560).
I use "Mission Control" all the time and it is stuttering and slow...overall a sluggish and unbearable experience.
The same goes for Desktop-Switching by swiping the screens or resizing and moving windows and files around.
So I was wondering why...and then I noticed that when taking a screenshot of my entire screen (CMD + 3) the image size of the screenshot was 3360x2100 and not the expected 2560x1600.
This means Mavericks is not scaling the UI with the appropriate factor (see above). For retina MacBooks it ist simply rendering one pixel of the classic, non-retina Interface in now 4 pixels (2x2) and sending this straight to the screen, which then "scales" it down to the resolution it is able to display.
Why is this bothering me? – Because the machine has to do a lot more work to render the higher resolution that can't even be displayed, due to the screens limitations.
2560x1600 = 4096000 pixels = 100%
3360x2100 = 7056000 pixels = 172%
This means the MacBook has to render 72% more information than actually can be displayed on the built-in screen and are just lost.
Of course this makes the overall UI feel sluggish and idly! Especially with the not that performant Intel Iris IGP and no dedicated graphics card.
All this extra "rendering" just results in a worse battery life due to the extra work that the graphics card and CPU have to do.
First, Apple...are you serious about this?
What can we do about this?
Is there a way to have this properly scaled?
Thanks in advance to everyone.

Okay...I thought deeply about this issue.
Even looking into ways to maybe fixing this on the software side. But it occured to me that this is to deeply embedded into the system that it won't be possbile to come up with a sufficient third-party solution.taht
The problem is that there is no intermediate step inbetween "standard DPI" graphics and "HiDPI" (image-resources named "[email protected]").
But there should be one, to minimize the amount of image information that needs to be processed by the device.
This effects especially the MacBook Pro retina 13", as it has the less powerful Intel Iris IGP, when performing on the highest scaled resolution (equivalent to 1650x1080).
As well as the MacBook Pro retina 15" without a dedicated, second Graphics Unit,when performing on the highest possible scaled resolution (equivalent to 1920x1200).
Those devices don't have enough resources to handle the consequential "HiDPI" resolutions of 3360x2100 for the 13" and 3840x2400 for the 15" model.
(Comment: 3840x2400 = 9,2MP, which is more than the standard 4K resolution of 3840x2160.
I analyzed the scaling factors as follows:
Factor "2" to display 1280x800 on the 13" model and 1440x900 on the 15" model in HiDPI.
Factor "1.777..." would be required to display 1440x900 on the 2560x1600 screen of the 13" model.
Factor "1.714..." would be required to display 1650x1080 on the 2880x1800 screen of the 15" model.
Factor "1.523..." would be required to display 1650x1080 on the 2560x1600 screen of the 13" model.
Factor "1.5" would be required to display 1920x1200 on the 2800x1800 screen of the 15" model.
As all the models seem to have no problem with rendering the intermediate scaling step (1440x900 for the 13" and 1680x1050 for the 15" model) at HiDPI, hence with the scaling factor 2. There is no real need to provide the UI-elements.
But in my opinion there is a strong need for a "MidDPI" ([email protected]) intermediate step for all the UI graphic elements that wis based on the scaling factor 1.5.
This would result in the following:
13" MacBook Pro retina with 2560x1600 screen:
1280x 800 @ 2x = 2560x1600 (no surplus, native screen resolution)
1440x 900 @ 2x = 2880x1800 (the surplus of 1088000px = ~1MP can still be handled and compansated by the weak Iris IGP)
1680x1050 @ 2x = 3360x2100 (the surplus of 2960000px = ~3MP is too much for the weak Iris IGP)
NEW 1680x1050 @ 1.5x = 2520x1575 (with a small border of left=20px, bottom=13, right=20, top=12 pixels, which means ~2,2mm and ~1.3mm around the 1.5x scaled image!).
15" MacBook Pro retina with 2880x1800 screen:
1440x900 @ 2x = 2880x1800 (no surplus, native screen resolution)
1680x1050 @ 2x = 3360x2100 (the surplus of 1872000px = ~2MP can still be handled by the Iris Pro IGP)
1920x1200 @ 2x = 3840x2400 (the surplus of 4032000px = ~4MP can't be handled sufficiently by the Iris Pro IGP)
NEW 1920x1200 @ 1.5x = 2800x1800 (nu surplus, native screen resolution, no border needed!)
The big advantage is that all the graphics have already been remodeled for the HiDPI mode.
So scaling those "factor 2x" images down to "factor 1.5x" should be comparably easy!
Example:
Left: Traditional "standard DPI" icon of "all my files".
Right: "@2x.png" for the "HiDPI" modes.
Middle: "@1.5x.png" suggestions for the "MidDPI" mode; easily scaled down from the lovely HiDPI graphics.
With this simple introduction of the "MidDPI" modes a significant amount of processing power can be saved.
This not only improves battery life when driving those higher scaled resolutions, but also lets the user access those resources for what really matters: processing power for the primary job that the Mac needs to get done.
Thanks in advance.

Why do the results between the OCR in the Vision Assistant and a VI generated from the vision assistant might defer?

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