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# zmqimage.py -- classes to send, receive and display cv2 images via zmq
#     based on serialization in pyzmq docs and pyzmq/examples/serialization

'''
PURPOSE:
    These classes allow a headless (no display) computer running OpenCV code
    to display OpenCV images on another computer with a display.
    For example, a headless Raspberry Pi with no display can run OpenCV code
    and can display OpenCV images on a Mac with a display.
USAGE:

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imagezmq: Transporting OpenCV images

Introduction

imagezmq is a set of Python classes that transport OpenCV images from one computer to another using PyZMQ messaging. For example, here is a screen on a Mac computer showing simultaneous video streams from 8 Raspberry Pi cameras:

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More details about the multiple RPi video streaming example

The beginning of the README.rst for this GitHub repository showed a screenshot of a Mac computer displaying simultaneous video streams from 8 Raspberry Pi cameras:

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Using imagezmq in Distributed Computer Vision Projects

The test programs show how imagezmq can be used to capture images on Raspberry Pi computers, send them to a Mac via imagezmq and then display them on the Mac. The ability for one hub to gather and process images from multiple sources allows computer vision pipelines to distribute vision processing across multiple computers.

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API and Usage Examples

The API for imagezmq consists of 2 classes with 2 methods each. The ImageSender class has 2 methods: one for sending an OpenCV image and one for sending a jpg compressed OpenCV image. The ImageHub class has 2 methods: one for receiving an OpenCV image and one for receiving a jpg compressed OpenCV image.

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yin-yang-ranch: Software & Raspberry Pis that Manage a Farm

Introduction

yin-yang-ranch is a collection of Python programs and Rasperry Pi hardware to help manage a small urban permaculture farm. The 2 acre farm is an ongoing science project to build living soil, capture rain in barrels, and grow a

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#imagenode.py snippet
#  (all the imports, logging setup hidden for now)
settings = Settings()  # get settings for node cameras, ROIs, GPIO
node = ImageNode(settings)  # start ZMQ, cameras and other sensors
# forever event loop
while True:
    node.get_sensor_data()  # grab camera images and other sensor data
    node.process_sensor_data()  # detect motion, etc.
    while len(node.msg_q) > 0:
        try:

jeffbass

imagezmq: Transporting OpenCV images

imagezmq is a set of Python classes that transport OpenCV images from one computer to another using PyZMQ messaging. For example, here is a screen on a Mac computer showing simultaneous video streams from 8 Raspberry Pi cameras:

jeffbass

Dependencies and Installation

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jeffbass

"""test sending a jpg buffer and check type & size of buffer

A simple test program that creates an image, then converts it to a
jpg_buffer and checks the type(), ndim, size and shape of the jpg_buffer.

This program tests some imports and some OpenCV functions, as well.

Open Source Licensed under MIT License (MIT)
Copyright (c) 2020, Jeff Bass, [email protected]
"""