imagedata stream

shu_higashiyama · March 8, 2021, 6:19pm

I asked about the directory of the previous image file.
But is my recognition incorrect and sending JPEG data via USB is wrong?
If my recognition is correct I was thinking that it can be checked on a serial monitor, but I can not confirm it.
Please tell me how you are sending camera data

Thank you

kwagyeman · March 8, 2021, 6:19pm

Hi, the camera sends a JPEG data stream over serial to the computer. You can use these scripts to see our protocol:

github.com

openmv/openmv/blob/master/tools/pyopenmv_fb.py

#!/usr/bin/env python2
# This file is part of the OpenMV project.
#
# Copyright (c) 2013-2021 Ibrahim Abdelkader <iabdalkader@openmv.io>
# Copyright (c) 2013-2021 Kwabena W. Agyeman <kwagyeman@openmv.io>
#
# This work is licensed under the MIT license, see the file LICENSE for details.
#
# An example script using pyopenmv to grab the framebuffer.

import sys
import numpy as np
import pygame
import pyopenmv
from time import sleep

script = """
# Hello World Example
#
# Welcome to the OpenMV IDE! Click on the green run arrow button below to run the script!

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github.com

openmv/openmv/blob/master/tools/pyopenmv.py

#!/usr/bin/env python2
# This file is part of the OpenMV project.
#
# Copyright (c) 2013-2021 Ibrahim Abdelkader <iabdalkader@openmv.io>
# Copyright (c) 2013-2021 Kwabena W. Agyeman <kwagyeman@openmv.io>
#
# This work is licensed under the MIT license, see the file LICENSE for details.
#
# Openmv module.

import struct
import sys,time
import serial
import platform
import numpy as np
from PIL import Image

__serial = None
__FB_HDR_SIZE   =12

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If you need robust multi-platform code then you’d have to look at how our IDE does it which is much more battle hardened.

shu_higashiyama · March 8, 2021, 6:19pm

Thank you for your quick response
I compiled pyopenmv.py
ImportError: no module named ‘serial’ occurs
Other errors also occur
I think that there are missing files or misconfiguration
Please point out.

kwagyeman · March 8, 2021, 6:19pm

Hi,

sudo pip install pyserial

That’s said, have you run python programs on a Linux device before? You may wish to reference some tutorial stuff. Using those scripts is for advanced users who know what they are doing.

shu_higashiyama · March 8, 2021, 6:19pm

Thank you for your reply

I did it according to your advice

python test2.py
The compile error no longer occurred when I ran it.
Use version python 37-32 (windows 7ver.)

However, on Open MV IDE
ImportError: no module named ‘serial’
Has occurred

Please tell me the setting of Open MV IDE

Thank you

kwagyeman · March 8, 2021, 6:19pm

Those script aren’t runnable in OpenMV IDE. They are designed to be run on the linux computer by CPython.

shu_higashiyama · March 8, 2021, 6:19pm

Thank you for your support

As you gave me advice
Running two files on Ubuntu on Linux
I was able to display the camera image.

But serial data stream
I have not confirmed until

Please advice again.

Thank you

kwagyeman · March 8, 2021, 6:20pm

Hi, you can dump the serial data stream by using this code:

Just execute it in the loop:

github.com

openmv/openmv/blob/master/tools/pyopenmv.py#L179



def arch_str():
    __serial.write(struct.pack("<BBI", __USBDBG_CMD, __USBDBG_ARCH_STR, 64))
    return __serial.read(64).split('\0', 1)[0]

if __name__ == '__main__':
    if len(sys.argv)!= 3:
        print ('usage: pyopenmv.py <port> <script>')
        sys.exit(1)

    with open(sys.argv[2], 'r') as fin:
        buf = fin.read()

    disconnect()
    init(sys.argv[1])
    stop_script()
    exec_script(buf)
    tx_len = tx_buf_len()
    time.sleep(0.250)
    if (tx_len):
        print(tx_buf(tx_len).decode())

See the 3 lines.