Transfering images from the usb OpenMV camera to the computer using PyCharm IDE

OpenMV Boards
1

Dear all,

We are using your camera for pattern matching and visualization,

I am trying to transfer images from the usb to the computer using this program open in PyCharm :

The following program has been loaded on the microcontroller camera : “image_transfer_jpg_as_the_remote_device_for_your_computer.py” on the OpenMV Cam

When trying to execute the program on PyCharm, i have the following error, I don’t know what I can do,

Would you have an idea ?

Thank you very much,

Best regards,

Wil.

Traceback (most recent call last):
File “C:/Users/Perso/WIL/14 - PROJECT21/PROJECT0/Image_processing/OpenMV_camera.py”, line 7, in
import io, pygame, rpc, serial, serial.tools.list_ports, socket, struct, sys
File “C:\Users\Perso\WILFRID\05 - TECHNICAL\Arduino_Python\Real_time2\venv\lib\site-packages\rpc_init_.py”, line 6, in
from rpc import jsonrpc, thrifty
File “C:\Users\Perso\WIL\05 - TECHNICAL\Arduino_Python\Real_time2\venv\lib\site-packages\rpc\jsonrpc.py”, line 12, in
from rpc import exceptions, clients, servers, chains
File “C:\Users\Perso\WIL\05 - TECHNICAL\Arduino_Python\Real_time2\venv\lib\site-packages\rpc\servers.py”, line 126
print ‘closes!’
^
SyntaxError: Missing parentheses in call to ‘print’. Did you mean print(‘closes!’)?

2

I think it’s importing some other RPC library.

3

Thank you for your answer : i ever installed the rpc package through “pip install rpc command”… :wink: what kind of rpc library you think we could add ?

4
5

Hello Kwagyema,
Thank you for your answer,
Now using your recommendations, I have the following sytnax error :

line 29, in
interface = rpc.rpc_usb_vcp_master(port=input())
AttributeError: module ‘rpc’ has no attribute ‘rpc_usb_vcp_master’

Thank you for your help !

6

Are you actually including the right rpc library?

If you are going to attach to the camera via python from the PC it’s expected you know what you are doing.

7

Are you actually including the right rpc library? → i have installed a package called rpc but seems not to be the good one,
Sorry but could you indicate me how can i install the rpc library for the OpenMV camera?
Thank you for your answer.

8

The camera has the rpc library on it. On the PC you just need the rpc.py file linked to above…

I pointed you to a desktop version of the library. You just put it into the same folder as the script you are writing for your desktop device.

9

Hello Kwagyeman,

Thank you for your precisions,

I refer to this following topic, since I have the same results of black window.

I have tested the 2 remote control configurations giving the same results :

  • jpg image transfer
  • streaming jpg image transfer

Let me know if you need more details on my configuration,

Thank you very much for your help !

10

It seems I have to debug this code some more, I’ll see if I can fix it.

11

Hello Kwagyeman,
That is very kind of you, thank you very much !
I look forward to hearing from you :wink:

12

Dear Kwagyeman,

Would you have any solution to the current issue ?

Thank you for your answer,

Best regards,

13

Sorry, I haven’t gotten to it yet.

14

Dear Kwagyeman,

Any news on this topic ? in a first approach, I just want to collect images (not necessary to have a video flux) of the OpenMV camera on my PC for post processing,

Thank you very much for your efforts, see you !

15

I’m way to backed up.

However, there’s another way to do this…

So, you can just print() the jpeg image. It’s a byte array.

E.g.

img = img.compress()
print(len)
print(img.bytearray())

Then on the desktop you can just look for the length bit.

However, this is hard to sync up with.

If you are willing to write some code then a much better method is to use the jpeg compressed for IDE tooling:

print(img.compressed_for_ide())

This will emit a jpeg image that has been formatted in a way where you can pick it out of a serial stream.

Here’s the code how to decode it:

Note all is needed from the above method. But, it’s like a shift register for the bytes coming in. You can do something similar in python.