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by gloomyandy
Thu Apr 19, 2018 11:55 am
Forum: EV3 Software
Topic: How do I update OpenCV 2.4.11?
Replies: 5
Views: 30

Re: How do I update OpenCV 2.4.11?

Well there you go. So looks like the openCV folks don't want to be bothered with old versions and I doubt if anyone will be rushing to help get a new version of openCV running on leJOS. It is now 3 years since I originally got openCV running on leJOS on the EV3. The reality is that the EV3 is now ra...
by gloomyandy
Wed Apr 18, 2018 1:10 pm
Forum: EV3 Software
Topic: How do I update OpenCV 2.4.11?
Replies: 5
Views: 30

Re: How do I update OpenCV 2.4.11?

Sorry but I have no idea what you are talking about. Who/what does not support OpenCV 2.4.11? This is the only version of openCV supported for leJOS.
by gloomyandy
Tue Apr 17, 2018 8:31 pm
Forum: EV3 Software
Topic: OpenCV query
Replies: 5
Views: 109

Re: OpenCV query

It is here: https://sourceforge.net/p/lejos/ev3/sdcard/ci/master/tree/ But please note I will not be answering any questions on how to build it, install it or anything else. You are on your own if you decide to try and do anything with it. I have no idea if the built libs and jars for 3.0 work with ...
by gloomyandy
Mon Apr 16, 2018 5:41 pm
Forum: EV3 Software
Topic: Does Cascade Classifier work in OpenCV 2.4.11?
Replies: 5
Views: 24

Re: Does Cascade Classifier work in OpenCV 2.4.11?

Unless you really know what you are doing, having two versions of something like openCV installed is likely to cause issues or at the very least confusion. Do you really need 3.4.1? I suspect things will be much simpler if you just use the same version on the PC and your EV3. If you must use two dif...
by gloomyandy
Sun Apr 15, 2018 8:20 pm
Forum: EV3 Software
Topic: Does Cascade Classifier work in OpenCV 2.4.11?
Replies: 5
Views: 24

Re: Does Cascade Classifier work in OpenCV 2.4.11?

Are you sure you have loaded the openCV native library before trying to use any openCV objects/methods? That is the usual cause of problems like this.

https://stackoverflow.com/questions/164 ... fier-error
by gloomyandy
Sat Apr 14, 2018 6:38 pm
Forum: EV3 Software
Topic: reading and writing on SD card
Replies: 1
Views: 20

Re: reading and writing on SD card

So what have you actually tried so far? It's just a standard Linux file system you just use the standard Java file I/O operations. Oh and this is not really a development question, so I've moved it to the software section...
by gloomyandy
Mon Apr 09, 2018 11:32 pm
Forum: EV3 Software
Topic: What are the "PC Libraries"
Replies: 1
Views: 33

Re: What are the "PC Libraries"

There are many components that make up leJOS both on the PC and on the EV3, unless you intend to develop leJOS itself, it really is probably not worth trying to understand them at a low level. If you do want to do so, then all of our source code is here... https://sourceforge.net/p/lejos/ev3/code/ci...
by gloomyandy
Sun Apr 08, 2018 5:17 am
Forum: leJOS EV3 Development
Topic: LeJOS library conflict with OpenCV 3.4.1
Replies: 5
Views: 40

Re: LeJOS library conflict with OpenCV 3.4.1

Best to post in "EV3 Software", "EV3 Projects" is really intended for you to post details of completed projects and ideas about larger more complex projects. Oh and a search on "openCV" in the forum would have found... https://lejos.sourceforge.io/forum/viewtopic.php?f=...
by gloomyandy
Fri Apr 06, 2018 5:34 pm
Forum: leJOS EV3 Development
Topic: LeJOS library conflict with OpenCV 3.4.1
Replies: 5
Views: 40

Re: LeJOS library conflict with OpenCV 3.4.1

Sorry but you did post this question in the Development section of the forum (which by the way is intended for discussions on the development of leJOS). If you simply target openCV 2.4.11 then no need to worry about cross compiling. You did not really answer my question as to are you running your &q...
by gloomyandy
Fri Apr 06, 2018 3:17 pm
Forum: leJOS EV3 Development
Topic: LeJOS library conflict with OpenCV 3.4.1
Replies: 5
Views: 40

Re: LeJOS library conflict with OpenCV 3.4.1

What sort of program are you trying to build/run? Is it a program that runs on the EV3 or on your PC? For programs that run on the EV3.... You can't just use a library like openCV with leJOS. There are native parts of the library that need to be compiled for the EV3 and the OS running on it. The ver...
by gloomyandy
Wed Apr 04, 2018 2:39 pm
Forum: EV3 Software
Topic: Algorithm like a Vacuum Cleaning Robot
Replies: 2
Views: 300

Re: Algorithm like a Vacuum Cleaning Robot

I think you need to provide a little more information if you want to get any help. What is it exactly that you are trying to understand? What is it you want to do?
by gloomyandy
Tue Apr 03, 2018 8:46 am
Forum: EV3 Software
Topic: ev3 Is it possible to play back images and sounds in Lejos?
Replies: 3
Views: 54

Re: ev3 Is it possible to play back images and sounds in Lejos?

You can display images that are in the correct format (we supply a tool that will convert them) but you can not directly display say a jpg image. See: http://www.lejos.org/ev3/docs/lejos/hardware/lcd/GraphicsLCD.html#drawImage-lejos.hardware.lcd.Image-int-int-int- http://www.lejos.org/ev3/docs/lejos...
by gloomyandy
Wed Mar 28, 2018 3:59 pm
Forum: EV3 Projects
Topic: Road lane follower
Replies: 2
Views: 29

Re: Road lane follower

Oh and that sounds like an interesting project, good luck with it. I suspect you may have problems with lighting, that was certainly an issue I found with my line follower, it was very sensitive to changes on the light on the track. I look forward to seeing how you get on!
by gloomyandy
Wed Mar 28, 2018 3:57 pm
Forum: EV3 Projects
Topic: Road lane follower
Replies: 2
Views: 29

Re: Road lane follower

Sorry about the password recovery. Sourceforge no longer allows us to send emails from hosted systems like this forum. I suspect that was the source of your problem.
by gloomyandy
Sat Mar 24, 2018 8:19 pm
Forum: EV3 Software
Topic: What is the usecase for the methods: disable and enable on the sensor EV3UltrasonicSensor
Replies: 2
Views: 42

Re: What is the usecase for the methods: disable and enable on the sensor EV3UltrasonicSensor

I assume you have read the documentation? It tells you one use case, it lets you turn the LED surrounding the sensor on and off (see this now very old video...) https://www.youtube.com/watch?v=NhMYSSVzw14 turning the sensors LED on and off in this video is performed using enable/disable. However the...

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