Search found 9 matches

by ecdm2
Wed Aug 14, 2019 1:24 pm
Forum: Technical Discussion
Topic: Reduced Resolution WVGA modes for the MT9V034
Replies: 2
Views: 2682

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: 2682

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: 16
Views: 5836

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: 1392

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: 1667

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: 1667

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: 2014

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: 1449

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: 1449

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...

Go to advanced search