Search found 15 matches

by ecdm2
Mon Dec 07, 2020 11:53 am
Forum: Project Discussion
Topic: AprilTag speed up with dynamic ROI
Replies: 0
Views: 131

AprilTag speed up with dynamic ROI

I have been using AprilTag tracking with the OpenMV in my work and thought I'd share a simple trick I have been using to increase the frame rate. The idea is that once you have found a tag in one frame, instead of running the algorithm on the whole of the next frame you search only a region of inter...
by ecdm2
Sat Nov 28, 2020 10:52 am
Forum: Technical Discussion
Topic: Problems cloning the repository from github
Replies: 4
Views: 102

Re: Problems cloning the repository from github

Thanks for confirming all OK at your end.

It turned out to be the parental controls on our internet provider (We are with Virgin Media in the UK.) Turned those off and all working :)
by ecdm2
Fri Nov 27, 2020 6:45 pm
Forum: Technical Discussion
Topic: Problems cloning the repository from github
Replies: 4
Views: 102

Re: Problems cloning the repository from github

Hi I followed the instructions on https://github.com/openmv/openmv/blob/master/src/README.md It has worked for me for the past couple of years without issue just suddenly stopped and I wondered if anyone else has had similar. I already tried a few fixes and nothing works. Please note I'm doing a str...
by ecdm2
Fri Nov 27, 2020 5:13 pm
Forum: Technical Discussion
Topic: Problems cloning the repository from github
Replies: 4
Views: 102

Problems cloning the repository from github

Hello I'm having problems cloning the OpenMV repository. I keep getting the following error messages: Cloning into 'openmv'... remote: Enumerating objects: 325, done. remote: Counting objects: 100% (325/325), done. remote: Compressing objects: 100% (237/237), done. error: RPC failed; curl 56 GnuTLS ...
by ecdm2
Sat Sep 28, 2019 11:45 am
Forum: Technical Discussion
Topic: The 5 VIAs just above the USB port
Replies: 7
Views: 2243

Re: The 5 VIAs just above the USB port

Great, Thanks.
by ecdm2
Sat Sep 28, 2019 11:04 am
Forum: Technical Discussion
Topic: The 5 VIAs just above the USB port
Replies: 7
Views: 2243

Re: The 5 VIAs just above the USB port

Can you supply power to VIN and have the USB connected (and supplying power) at the same time ?

Thanks
by ecdm2
Wed Aug 14, 2019 1:24 pm
Forum: Technical Discussion
Topic: Reduced Resolution WVGA modes for the MT9V034
Replies: 2
Views: 3430

Re: Reduced Resolution WVGA modes for the MT9V034

Thanks - that all looks pretty straightforward.

Ed
by ecdm2
Wed Aug 14, 2019 11:01 am
Forum: Technical Discussion
Topic: Reduced Resolution WVGA modes for the MT9V034
Replies: 2
Views: 3430

Reduced Resolution WVGA modes for the MT9V034

Hello

I'd like to use the full width of the Global Shutter (MT9V034) sensor at reduced resolution for AprilTag detection but can't see a QWVGA or QWVGA2 mode.

Is it possible to do this ?

If I need to write to the camera registers can you give me any tips / pointers ?

Ed
by ecdm2
Fri Jul 12, 2019 7:51 am
Forum: Project Discussion
Topic: Minimal detect AprilTag (don't need tag ID) with better range?
Replies: 21
Views: 10772

Re: Minimal detect AprilTag (don't need tag ID) with better range?

Is this a DRAM camera like this: https://hackaday.com/2014/04/05/taking-pictures-with-a-dram-chip/ Or is a DRAM module between the camera sensor and the mcu ? If it is between the sensor and the mcu will it slot between either the rolling or global shutter modules or is it on a board with its own se...
by ecdm2
Fri Jul 12, 2019 5:37 am
Forum: General Topics
Topic: OpenMV positioning
Replies: 2
Views: 2065

Re: OpenMV positioning

Hi, You can achieve this using AprilTags.

See:

http://docs.openmv.io/library/omv.image ... ranslation

and a calibrated camera (I calibrated mine by saving images a series of chessboard images and using OpenCV offline.)

Ed
by ecdm2
Thu Jul 11, 2019 12:58 pm
Forum: General Topics
Topic: H7 Camera Extension Cable
Replies: 3
Views: 2417

Re: H7 Camera Extension Cable

Thanks

That's great news 8-)

Ed
by ecdm2
Thu Jul 11, 2019 7:42 am
Forum: General Topics
Topic: H7 Camera Extension Cable
Replies: 3
Views: 2417

H7 Camera Extension Cable

I have found the SingTown website and would like to purchase a couple of their camera extension cables for the H7 but cannot see a way to place an international order (I'm in the UK.) I understand that they have an agreement for selling within China but this product (as far as I can tell) is only av...
by ecdm2
Thu Dec 13, 2018 6:12 am
Forum: Technical Discussion
Topic: Accessing/translating to lower level C/C++ code
Replies: 4
Views: 2733

Re: Accessing/translating to lower level C/C++ code

Link to instructions for installing firmware development environment: https://github.com/openmv/openmv/wiki I got this link off the Kickstarter campaign but it could do with being somewhere more accessible. Would it be useful to have a link to this page either under the documentation section of the ...
by ecdm2
Sun Dec 09, 2018 5:07 am
Forum: Technical Discussion
Topic: apriltag.corners() to subpixel precision ?
Replies: 3
Views: 2095

Re: apriltag.corners() to subpixel precision ?

Thank You Kwabena

I'm not that familiar with C / Cython and I'm really pressed with project demands at the moment. Ironically this looks looks like a good place to start getting familiar with the firmware.

I've submitted as an issue on GitHub for now anyway. Hope that is OK.

Best,

Ed
by ecdm2
Sat Dec 08, 2018 7:28 am
Forum: Technical Discussion
Topic: apriltag.corners() to subpixel precision ?
Replies: 3
Views: 2095

apriltag.corners() to subpixel precision ?

Hello In Olson's 2011 AprilTag paper he states that the: " ... corner estimates are accurate to a small fraction of a pixel." I've been using the apriltag.corners() to get the corner positions of the tags but they are only returned with pixel (integer) precision. Could you change this in the C/C++ f...

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