JeVois Tech Zone - Recent questions and answers

How to solve this Error: ModuleNotFoundError: No module named 'torch._C'

Sat, 14 Aug 2021 09:50:30 +0000

Hello. I have the following problem:

In my Python Software I use : from detecto import core, utils, visualize

After this I imediately receive this error:

ERR Log::warnAndIgnoreException: Caught exception from the Python interpreter:

ERR Log::warnAndIgnoreException: Python traceback (most recent calls last):

ERR Log::warnAndIgnoreException: File /jevois/modules/Dambrowsky/PythonTest/PythonTest.py

ERR Log::warnAndIgnoreException: Line 166, in process:

ERR Log::warnAndIgnoreException: File /usr/lib/python3.7/site-packages/detecto/core.py

ERR Log::warnAndIgnoreException: Line 4, in <module>:

ERR Log::warnAndIgnoreException: File /usr/lib/python3.7/site-packages/torch/__init__.py

ERR Log::warnAndIgnoreException: Line 79, in <module>:

ERR Log::warnAndIgnoreException: ModuleNotFoundError: No module named 'torch._C'

I have installed the following Libraries:

hell pip list

Package Version

--------------------- ---------------

arrow 0.10.0

asn1crypto 0.24.0

async-timeout 3.0.1

attrs 18.2.0

backcall 0.1.0

beautifulsoup4 4.5.3

bitstring 3.1.5

cached-property 1.4.0

cbor 1.0.0

certifi 2018.11.29

cffi 1.11.2

characteristic 14.3.0

chardet 3.0.4

constantly 15.1.0

cryptography 2.3.1

cycler 0.10.0

daemonize 2.4.7

DataProperty 0.29.1

decorator 4.0.11

detecto 1.2.1

humanize 0.5.1

idna 2.8

iowait 0.2

ipython-genutils 0.2.0

json-schema-validator 2.4.1

jsonmodels 2.4

jsonschema 2.5.1

kiwisolver 1.3.1

Logbook 1.4.3

lxml 4.3.3

markdown2 2.3.6

matplotlib 3.4.2

mbstrdecoder 0.2.2

more-itertools 4.0.1

msgpack 0.6.1

multidict 4.5.2

numpy 1.16.3

pandas 1.1.0

path.py 10.5

pathtools 0.1.2

pathvalidate 0.16.0

pexpect 4.6.0

pickleshare 0.7.4

Pillow 8.3.0

pip 19.1

ply 3.11

posix-ipc 1.0.4

protobuf 3.6.0

psutil 5.6.2

ptyprocess 0.5.1

py 1.8.0

py-ubjson 0.12.0

pycparser 2.19

pycrypto 2.6.1

pyinotify 0.9.6

pylibdmtx 0.1.9

pylru 1.0.9

pyparsing 3.0.0b2

pytablereader 0.15.0

python-dateutil 2.8.0

PyTrie 0.3.1

pytz 2018.9

PyYAML 4.2b4

requests 2.21.0

scandir 1.9.0

schedule 0.6.0

scipy 1.3.0

see 1.4.1

semver 2.8.1

setuptools 41.0.1

sh 1.12.14

simplegeneric 0.8.1

simplejson 3.11.1

SimpleSQLite 0.15.0

six 1.12.0

sortedcontainers 2.1.0

tabledata 0.0.5

tempora 1.7

torch 1.1.0

torchvision 0.3.0a0+bbd363c

tqdm 4.61.2

traitlets 4.3.2

typepy 0.0.20

ujson 1.35

urllib3 1.24.2

uvloop 0.12.2

validators 0.12.2

visitor 0.1.3

Whoosh 2.7.4

xlrd 1.0.0

It looks like the Library torch._C is not available. Is there anybody who can help me?

Thank you very much.

Peter Dambrowsky

How to uninstall a Library from the Linux partition of the microSD

Tue, 10 Aug 2021 07:26:15 +0000

When I have installed a Library with the Inventor using a .whl file (it is functioning only with the inventor under Ubuntu) and I want do delete it later, how do I have to do it. Is there a special shell command? I tried to do it directly under usr/lib/python3.7/site-packages on the microSD Linux partition. But here I could see, that I have not the rights to delete something.

An answer would realy help me.

Best regards

Peter

Answered: Problem when installing customized module to jevois

Tue, 09 Mar 2021 08:48:06 +0000

I have no idea about this but in this situation you get help with expert and resolve your problems.

Answered: How to create an own MobileNetSSD caffe model

Sat, 09 Jan 2021 09:12:42 +0000

Up ! Artificial Intelligence is hard !

Answered: By now, is it possible to read IMU raw data using python?

Sat, 09 Jan 2021 09:11:58 +0000

Yes it's possible but, go show tutorial, python is hard to use !

Answered: For DemoArUco, how do you measure marker size?

Sat, 09 Jan 2021 09:11:19 +0000

You measure the Size " ML " Go indeed include the border !

Answered: Strange Arduino pins in the visually-guided toy robot tutorial

Thu, 29 Oct 2020 14:14:23 +0000

I think you need to find another arduino wth tx/rx with different pins to control your motor.

What are the units of the absolute exposure "absexp" setting for the camera?

Fri, 23 Oct 2020 21:18:44 +0000

Is absolute exposure (absexp) in units of uS (microseconds) or 100uS? I see some cameras use 100uS but I can't confirm if this is true for JeVois.

absexp can be set from 1 to 1259 in JeVois Inventor. I looked at the datasheet for the camera sensor (ov7725 in my case) but I can't relate this back to any numbers I see there such as "Electronic Exposure Up To 510:1". Thanks!

Answered: Jevois-inventor does not load camera, 1.15 firmware, Latest Ubuntu 20 Virtualbox with 1.15

Mon, 14 Sep 2020 21:56:23 +0000

Hum, interesting, probably a bug in VirtualBox for Mac. You did install the extension pack, right?

Can you give us more parameters for your Mac? like OS version and Virtualbox version?

In the meantime, there is no advantage in running the inventor in VirtualBox, you should just run the native MacOS version and remove your USB filters. The workflow then typically is:

- install a USB filter in VirtualBox so that your USB-to-SD adapter gets attached to the virtual machine. Delete the filters you had for JeVois and its serial-over-USB.

- develop code in the linux virtual machine

- flash it to microSD

- insert microSD into JeVois

- start native MacOS JeVois Inventor and connect camera

Answered: How can I determine whether active cooling is necessary for my application?

Mon, 14 Sep 2020 21:49:48 +0000

Yes, the fan is just connected to 5V and always on at full speed. We had some PWM speed modulation hardware logic on a previous version of the board, but that one had other issues, so finally we decided to roll back the design for mass production.

Making a guess based on CPU usage is the best. Anything below 300% should be no problem using a large heatsink like we used in that doc page you mention. We had a deep net running at 375% CPU (i.e., almost loading all 4 cores to the max) and that was stable with the heatsink.

I see DemoArUco around 220% CPU in the screenshots here: http://jevois.org/moddoc/DemoArUco/modinfo.html

So it should be no problem. Make sure you have a good thermal contact with the heatsink. You may want to spread the glue on the chip with a screwdriver or such so that it fully covers the whole chip before applying the heatsink.

Answered: please moderate this message so I can post.

Fri, 28 Aug 2020 21:39:10 +0000

just found this now buried among 600 spam post attempts... I believe you need one more approved one before you get out of moderation.

Answered: support for data matrix / small 2D barcode

Wed, 24 Jun 2020 22:40:17 +0000

I remember working on this a while back but I am not sure I ever converged... Can you please check this:

http://jevois.org/moddoc/PyDMTX/modinfo.html

with a recent JeVois version (like 1.14.0). The fact that there is no screenshot means maybe it is not fully working yet. Basically we need to install libdmtx and pydmtx on the platform hardware. As far as I remember, it is quite slow, so maybe that is why we did not complete it.

Answered: Using tensorflow in python

Wed, 24 Jun 2020 22:34:45 +0000

This is not supported, though you should be able to run your model using Python OpenCV, see for example

http://jevois.org/moddoc/PyClassificationDNN/modinfo.html

http://jevois.org/moddoc/PyDetectionDNN/modinfo.html

Unfortunately cross-compiling TF is becoming increasingly difficult because of their bazel build system, but we will look into whether we could compile the python bindings into our TF module.

Answered: Headless jevois : frame to Serial

Wed, 24 Jun 2020 22:31:12 +0000

In no-USB on, you also need to issue a "streamon" command once your module is configured and ready to start work. Before that, it is just waiting idle. Please see

http://jevois.org/tutorials/ProgrammerPythonSaveImages.html

for example.

Answered: Using tensorflow within a python module

Wed, 24 Jun 2020 22:27:52 +0000

We do not support TF directly in Python on JeVois, only C++ for now. However, maybe using OpenCV would help (you should be able to run TF models using the OpenCV framework). That one is fully accessible from Python.

Answered: what is the best way to locate a red laser pointer spot using jevois ?

Wed, 24 Jun 2020 22:24:44 +0000

Maybe this could help?

https://answers.opencv.org/question/52754/laser-pointer-detect-and-track/

looks like the best way would be to use an optical filter in front of the lens of JeVois. With that, the basic ObjectTracker module should work ok.

Answered: Is it possible to send both image and IMU data back to host computer through USB cable?

Wed, 27 May 2020 09:33:08 +0000

I had the same problem, I was searching for a better way to send the IMU data without the coupling of the image data. I watched a lot of youtube tutorials, but I didn't found anything that could help to answer this question, but take a lot to this webpage: https://www.techradar.com/reviews/nordvpn, maybe you will find something. I didn't try yet, but my friend recommended to search there.

Answered: I am not able to add jevois repository and install jevois on ubuntu 18.04

Tue, 12 May 2020 07:48:17 +0000

yes, so sorry, the certificate expired and I had to go to the server physically today to renew it. Please try again, it should work now.

Answered: Not able to install developer software the quick way as given in jevois.usc.edu

Tue, 12 May 2020 07:47:57 +0000

yes, so sorry, the certificate expired and I had to go to the server physically today to renew it. Please try again, it should work now.

camera fails to connect to mac inventor

Sat, 09 May 2020 22:12:43 +0000

I have two new JeVois cameras and I cannot get either one of them to connect to my MacBook Pro workstation with Inventor. I have the latest SD flashed and have the camera connected to separate power with more than enough power. The camera boots up and the indicator light is green and then turns orange. I am using a JeVois Y cable with USB B for the power and micro USB plugged into a micro USB to USB B adapter to connect with the Mac. Inventor is up and running when I plug in the camera to the Mac, waiting for a connection. But the camera never connects. Photobooth and StreamLabs OBS both do not see a second camera other than the laptop built in camera. What other troubleshooting can I do?

Answered: Possible software error in the JeVois cam A33

Wed, 15 Apr 2020 11:25:46 +0000

I found a solution to send date and time from an Arduino Mega about some seconds after power on (the red led has to be on)

You have to do it with this Arduino software:

#define JeVois Serial2 // for example com2

  JeVois.begin(115200);     //Verbindung mit JeVois-Kamera
  JeVois.setTimeout(1000000);

  JeVois.println("date " + DatumZeit);

And now very important:

In the variable DatumZeit has to be the actual date and time with a string like this "date 041112302020.00" it means "date MMDDhhmmCCYY.ss" M = Month, D = Day, h = hour, m = minute, CC = the first 2 digits of the year, YY = the last 2 digits of the year and .ss = seconds (I use here always 00).

Only this way functions perfect.

Best regards

Peter Dambrowsky

Answered: Jevois daemon hangs (solid green) upon Jevois-Inventor startup

Sun, 05 Apr 2020 17:17:09 +0000

If all else fails (and we found that it did), a reflashing of the Jevois sd card should hopefully do the trick.

We never found the source of the ambiguous error, but after reflashing the sd card, adding the same modules and jevois core code changes we had made previously, we found the camera was recognised by webcam viewing software (and jevois inventor) again.

Actual FOV of standard lens

Sat, 04 Apr 2020 22:54:42 +0000

I have an A33 Jevois camera with standard lens. I'm trying to use this camera for mapping/SLAM purposes, so I need to get FOV relatively accurately. Checking online, there appears to be conflicting specs on this, where the FOV is stated as either 60^o or 65^o (here http://jevois.org/doc/Lenses.html and here https://www.jevoisinc.com/pages/hardware).

I decided to take the camera to the Vicon motion capture room to see if I could validate either of these figures.

I calculated the FOV by determining the horizontal length a known object was in the camera image, then knowing exactly how far away the camera was from that object, I could calculate the FOV. The figure I kept realising was just shy of 51^o (well short of the 60^o - 65^o).

Have you guys done any testing to determine the effective FOV of this device?

Answered: How to get Serial data from jevois to NodeMCU ?

Fri, 03 Apr 2020 14:21:21 +0000

It seems that it's not possible to use both RxTx pins and serial monitor. It works using following code:

#include <ESP8266WiFi.h>
#include <ESP8266httpUpdate.h>
#define INLEN 256

char instr[INLEN + 1];

const char* ssid = "SSID";
const char* password = "PWD";
const int led=2;

void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.waitForConnectResult() != WL_CONNECTED) {
delay(1000);
ESP.restart();
}
}

void loop() {
digitalWrite(led, LOW);
Serial.println("info");

String val = "test=";

while (Serial.available()) {
val.concat((char)Serial.read());
}

HTTPClient http; //Declare object of class HTTPClient
http.begin("http://192.168.1.33/duino/read_post_request.php");
http.addHeader("Content-Type", "application/x-www-form-urlencoded");
int httpCode = http.POST(val);
http.end();
digitalWrite(led, HIGH);
delay(1000);
}

Answered: how to detect a laser pointer spot (650 nm) using jevois ?

Fri, 03 Apr 2020 09:38:59 +0000

You could try coding your own python module to detect your laser spot.

Using cv2.inRange you can detect red blobs in the camera image. Have a look here https://stackoverflow.com/questions/42840526/opencv-python-red-ball-detection-and-tracking and https://www.pyimagesearch.com/2015/09/14/ball-tracking-with-opencv/ to put you on rails.

Answered: I am trying cause my Arduino UNO to trigger the recording of Video through the Save Video Module in Jevois.

Wed, 11 Mar 2020 21:04:11 +0000

You need to remove the "setpar serout" that is in most of your strings. Basically, you should println() this to JeVois:

setmapping2 YUYV 640 480 30.0 JeVois SaveVideo

to setup, then

streamon

to start video streaming, etc

Answered: Object detection

Wed, 11 Mar 2020 20:58:02 +0000

The ObjectDetect module http://jevois.org/moddoc/ObjectDetect/modinfo.html has several parameters you can tune if your objects are not detected with the default settings. The default settings assume that your object has unique texture elements, and will not work well with objects that are very simple, e.g., a white square object.

First try higher "distthresh". This is how similar keypoints must be between learned image and current image.

Then try to broaden the range for "goodpts", this is how many matching key points are needed between learned image and current image.

Then try to lower "hessian" which controls how sharp keypoints have two be to be considered.

Answered: How can I store a Video frame by frame to the sdcard of my A33 cam

Wed, 11 Mar 2020 20:51:19 +0000

Looks like you are opening "cap" as a video capture device but that is not available in JeVois modules.

The core JeVois software does the capture for you. All you need is to write a process() function that will be called each time a new frame is available from the sensor. In that function you can save your frames. Make sure you make "out" a class data member of your module so that it persists across multiple calls to process()

Have a look here for some guidance:

http://jevois.org/tutorials/ProgrammerInvHello.html

http://jevois.org/doc/ModulePythonTutorial.html

Start with the code for Hello. Open "out" (renamed self.out) in __init__ of the module). Then in process() add your "out.write(frame)". I recommend that you use an absolute path for your saved video (e.g., /jevois/myvideo.avi)

Answered: DemoSaliency headless

Wed, 11 Mar 2020 20:43:04 +0000

You need to create your own module for that, or add headless capability and whiteness computation to ours.

Starting from http://jevois.org/basedoc/jvpkg_2modules_2JeVois_2DemoSaliency_2DemoSaliency_8C_source.html

you would copy the whole process() function into a new version that does not have a second arg for the output frame. This is the function you need for headless operation. Then delete everything related to drawing the output composite display. Then add your whiteness evaluation code.

Here are a few pointers to get started:

http://jevois.org/tutorials/ProgrammerSetup.html

http://jevois.org/doc/ModuleTutorial.html

http://jevois.org/tutorials/UserHeadless.html

Answered: How to detect new objects in Jevois inventor

Wed, 11 Mar 2020 20:34:20 +0000

Oh, it should be either in the "Console" tab of JeVois Inventor (easiest), or in a terminal connected to JeVois over serial port.

Does the jevois-inventor provides the feature to flash the current time off host computer

Fri, 06 Mar 2020 17:09:45 +0000

Hello, I am looking for a python program to take the date and time from the host computer and send it to the Jevois A33 cam ( like I can do it in the console with the comand "date 2020.03.06-15:30:00".

I want to do this with a program line in Python on ervery start of the Cam.

Please help me.

Regards

Peter

Answered: Update the time in jevois each time automatically.

Mon, 02 Mar 2020 14:33:03 +0000

Please tell me more how the jevois-inventor can flash the current time from the host computer.

Thank you.

Regards Peter

Answered: Jevois doesn't work after Raspberry PI reboots

Mon, 17 Feb 2020 18:11:45 +0000

Looks like jevois is getting confused somehow. Maybe you have some program like modemmanager (which is on Ubuntu) running on your Pi, which sends some modem probes over the USB-to-Serial port of JeVois on boot?

Looks like ModemManager is available on RPi, maybe you have it installed? Can you try sudo apt purge modemmanager and/or inspect your dmesg logs to see whether there is anything about modem, or ttyACM0 or such?

Answered: How do I save JeVois camera images on my arduino

Fri, 14 Feb 2020 00:38:23 +0000

Have a look at http://jevois.org/qa/index.php?qa=3879

Answered: How do I save pictures if it's hooked up to a microcontroller

Fri, 14 Feb 2020 00:37:06 +0000

Try our SaveVideo module, and see here for a tutorial:

http://jevois.org/moddoc/SaveVideo/modinfo.html

http://jevois.org/tutorials/User120fps.html

That will save on the microSD inside JeVois.

Answered: Saving video directly to a PC

Tue, 11 Feb 2020 21:53:44 +0000

yes, AmCap works, or guvcview on linux can also save video.

Answered: Read Only File System after sendSerial?

Tue, 11 Feb 2020 21:52:54 +0000

Can you use an absolute path when you open the file, like "/jevois/targetData.txt"?

It might be that for some strange reason you do not always end up being in the module's directory as you should be (maybe something funny going on during instantiation of a python module, the constructor may be called before we change directory to the module's directory). The /jevois partition should be writable.

Or, in the inventor console, try

shell dmesg

and look for messages that would signal some disk error and re-mounting read-only. Or try

shell touch /jevois/hello

and then

shell ls /jevois

and see if you get errors and whether the file was created.

If that does not help, we have had strange situations also (but hard to reproduce) when trying to save python code to SD repeatedly and across multiple days. I think it might have to do with date and pycache. And maybe a broken pycache triggers the remount to read-only. So I would recommend the following: after JeVois boots up, fire up the inventor and go to the System tab and set the date/time on the camera to that of your host. Then you should have no problem editing, etc. My guess about this is that since by default jevois starts on Jan 1, 1970 (since there is no battery for the clock), depending on when you edit and try to save, you may end up with saving the source python file earlier than you did last time you booted up JeVois, and so now you end up with the compiled python code in pycache being in the future compared to the time at which you save your source python file. That may upset python.

Answered: Darknet YOLO Freezing

Tue, 11 Feb 2020 21:30:08 +0000

Are you moving your camera? If so, you may have some connectivity issues at the mini-USB connector of JeVois. This connector was not designed for mechanical stress. Usually when we run demos, we mount the camera on a tripod and tie the USB cable to the legs of the tripod, so that there will be no mechanical stress or motion at the mini-USB connector. We have cameras running for months non-stop like that. I just confirmed that YOLO (1280x480 YUYV) is running fine and is not running out of memory, etc, it is stable here.

Also see other posts about freezing, in particular: you could also have a bad USB cable (we have had a few of those), or you can use some camera mount with strain relief, available on thingiverse.com (search for "jevois").

Answered: Jevois-daemon freezing after ~2 seconds

Tue, 11 Feb 2020 21:23:14 +0000

Yes, we have seen similar things using virtual box on MacOS just recently.

Could you please try to shut down your virtual box completely (to make sure it releases the USB ports) and then get the native MacOS version of JeVois Inventor (or OBS Studio or Webcamoid) and see whether that works? In our testing it did work. So we concluded something was going on with virtual box, maybe the video drivers or such. We updated to the latest virtual box and latest extension pack and rebooted the host (yes, this is needed, even on Mac), and the problem was gone somehow...

Answered: How to fix "Are you using old TFLite binary with newer model?"

Fri, 31 Jan 2020 02:22:14 +0000

Darn, we are kind of stuck at TF 1.9.9, please see the exact version in

https://github.com/jevois/jevoisbase/blob/master/Contrib/reinstall.sh

we get this exact version (the long number is the commit ID on GitHub):

get_github tensorflow tensorflow 25c197e02393bd44f50079945409009dd4d434f8

And then we compile only the C++ source files we need (discarding anything that would try to open a window and such), and those get integrated into libjevjoisbase, please see here, section about TensorFlow:

https://github.com/jevois/jevoisbase/blob/master/CMakeLists.txt

We have tried to update to a newer version but their build system has changed and we have not yet been able to track down what exactly gets compiled and how through their bazel-based build. If you can somehow figure out an updated list of sources for the one that starts at line 378 of the above CMakeLists.txt, then we can try that update to a newer tensorflow again.

Otherwise, maybe you can make your model work under TF 1.9.9?

Answered: Sending commands from python to serial command line

Fri, 31 Jan 2020 02:13:21 +0000

This is not supported. Just to give you the historical background: we started with a C++ core framework. In there, all one can access, from within a vision module, all core functionality (like list the mappings, etc) by calling the appropriate functions on the JeVois Engine object (which is always at the root of a vision pipeline). Then we added the command-line interface as a way for the host computer to also access some of the core functions, over a serial port. Finally we added python support on top of the C++ core, with some direct bindings from the core to the Python side of things, shown here:

http://jevois.org/doc/ProgrammerPython.html

(see section on Python bindings provided by jevois core).

Now we did not provide a python binding for something like listmappings because a vision module (the python code you are writing) should not need to know that. It should work just for whatever mappings it can support, and the host computer is in charge of picking a mapping (and hence a vision module) it wants to run. If listmappings is indeed what you want, then can you tell us why you would need it? From within a vision module, you should never have to worry about that list. If you want something else, maybe we can add a python binding for that?

In the meantime, the best way to quickly solve your problem is to have your host computer issue some commands to the jevois command-line interface, for example like here:

http://jevois.org/tutorials/UserPanTilt.html

if you scroll down to the first piece of source code, line 43 the Arduino sends this to the JeVois camera:

SERIAL.println("setpar serlog None");

to configure it.

Or in this one:

http://jevois.org/tutorials/UserColorTracking.html

some python program running on the host sends some commands to JeVois as the sliders in the Python GUI are moved around.

Answered: Issue in running custom Tensorflow network

Tue, 28 Jan 2020 21:58:55 +0000

VGG-16 may indeed be too big for JeVois.

Can you email us your model files and params.cfg to jevois.org@gmail.com? We can try to load it here with a USB-to-serial diagnostic cable plugged in and we can tell you if the camera runs out of memory.

Answered: JeVois A33 powers up but LED stays green

Tue, 28 Jan 2020 21:55:22 +0000

You can diagnose boot if you have a USB to serial cable connected to the 4-pin serial port of JeVois. First you edit boot options on the SD card to enable serial console. Then you should see boot messages. See here:

http://jevois.org/doc/Debugging.html

(edit uEnv.txt in the BOOT partition and uncomment the second set of kernel parameters, then launch some terminal program on your host, selecting the port of your USB-to-Serial cable and 115200 bauds).

But usually the problem is either a bad USB cable, weak USB port on the host, or the SD card is not fully inserted into JeVois (try to use a credit card to push it in all the way, just beware that if you slip, it will fly out, so be ready to catch it).

Answered: Tensorflow lite Object Detection

Tue, 28 Jan 2020 21:49:45 +0000

Looks like you have 4 output arrays, but TensorFlowEasy only works with 1 output. So you would have to create your own JeVois module to handle your output format. The easiest is to use OpenCV and Python. Skip the conversion to TFlite for now as I am not sure how well that works with OpenCV. Just use your baseline trained TF network. Then look at these two:

For recognition only (identify what is in the image): jevois module PyClassifcationDNN

http://jevois.org/basedoc/jvpkg_2modules_2JeVois_2PyClassificationDNN_2PyClassificationDNN_8py_source.html

For detection + identification (find bounding boxes around objects and identify the objects): jevois module PyDetectionDNN

http://jevois.org/basedoc/jvpkg_2modules_2JeVois_2PyDetectionDNN_2PyDetectionDNN_8py_source.html

You can edit those modules in JeVois Inventor and adapt them to your particular output format.

Answered: Any OpenCV Python demo to stream data directly from JeVois as a UVC camera?

Tue, 28 Jan 2020 18:50:43 +0000

yes, there is no separate python-libjevois, both the C++ code and the python bindings are in libjevois.so

as far as a demo to behave like a dumb camera, start with the Python Sandbox module:

http://jevois.org/basedoc/jvpkg_2modules_2JeVois_2PythonSandbox_2PythonSandbox_8py_source.html

and just replace line 62 with:

outimg = inimg

which will simply copy the image from the sensor (inning) to the one that is sent over USB to the host computer (outimg).

Answered: I've added a custom C++ module and JeVois Inventor can't connect to the camera

Tue, 28 Jan 2020 18:43:57 +0000

hum, that is very strange. Can you email us more info about your setup? I am guessing you have an entry for your module in videomappings.cfg already? One possibility is that on some machines (MacOS, Windows), the camera drivers get confused when trying to select among several video modes that only differ by their frame rate. This is not a problem when using guvcview, webcamoid, etc but it is a problem when using the Qt camera stack, which we use in the inventor. So maybe disable in videomappings.cfg any other modes that have the same output resolution but different frame rates.

Answered: JeVois Frequently Freezing

Tue, 28 Jan 2020 18:40:33 +0000

Usually, this could be either a problem with the USB cable, or with the connectors. The mini-USB connector on the camera is not designed to handle mechanical stress. If you are moving the camera around to look at various objects, it can sometimes disconnect (even though the connector is still plugged in, the connection gets temporarily broken). Usually when we give demos where the camera moves a lot, we mount it on a tripod and we secure the USB cable to one leg of the tripod so that it will not move at all at the connector when the tripod is moved. Some First Robotics teams have designed mounts with strain relief. Look for 'jevois' at thingiverse.com, for example this one:

https://www.thingiverse.com/thing:2734559

which also has a mount for a ring of LEDs (for night/IR vision).

If the problem occurs when the camera is not moving at all, then the next likely cause is a bad USB cable. We have had a few reports of bad cables. We have changed cable brand since then but maybe try another cable if you have one around.

Answered: Jevois is not detected by Linux (Ubuntu 18.04.3 LTS)

Fri, 10 Jan 2020 18:36:22 +0000

Maybe something happened to your camera or to your USB cable? If you have another USB cable, please try this. Otherwise please email us at jevoisinc@gmail.com and we will help you.

Answered: Green light remains on, fan turns on, camera not detected by Windows

Fri, 10 Jan 2020 18:35:07 +0000

If the card is fully inserted and you see no orange flash, maybe there is an issue with your JeVois unit. It is quite rare though as every unit is tested twice at the factory. Please email us at jevoisinc@gmail.com and we will help you.

On rare occasions, also the USB cable may be bad, so if you have another one please try this.

Answered: I need a program in Phyton to integrate some more pictures.

Fri, 10 Jan 2020 18:33:06 +0000

You need to do that offline using whichever method is recommended for that particular network. Once it is retrained, you can copy the weight files to your microSD and edit the config file for your module to load that network by default.

For mobilenet + SSD Caffe model, you would usually use this module:

http://jevois.org/moddoc/DetectionDNN/modinfo.html

http://jevois.org/moddoc/PyDetectionDNN/modinfo.html

For the latter (Python version), you can just edit the Python code in JeVois inventor, add a new block like this one:

elif (model == 'MobileNetV2SSD'):

classnames = '/jevois/share/darknet/yolo/data/coco.names'

modelname = '/jevois/share/opencv-dnn/detection/ssd_mobilenet_v2_coco_2018_03_29.pb'

configname = '/jevois/share/opencv-dnn/detection/ssd_mobilenet_v2_coco_2018_03_29.pbtxt'

with the correct locations for the 3 files: List of class names, weight file, model file.