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Version History and Changelog

All notable changes the imagenode project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Ongoing Development

  • Improving documentation content, layout, arrangement and flow.
  • Developing a "large image buffer" using the new Python 3.8 SharedMemory class. The idea: have the camera capture main thread put images in a very large (up to available memory; could be 3GB on RPi 4 models). Allow sending of images in a separate multiprocessing process that empties the buffer by sending images via imageZMQ. The advantage over the existing send_threading option would be using a 2nd process (and a different RPi core) rather than a 2nd thread running on the same core to send images.
  • Adding the ability to capture images from stored image files as a substitute for capturing images from a camera. Will allow testing and tuning of options from real world images gathered by imagenodes scattered around the farm. The existing stored image library is large and could potentially be used for adding machine learning capability to the RPi imagenodes.

0.3.0 - 2020-12-19

Improvements

  • Added a REP_watcher yaml option which tests for REP-sent-but-no-timely-REQ received. This eliminated the need for signal.SIGALRM, which does not work in Python threads, such as when the send_threading yaml option is used. The new REP_watcher option defaults to True.
  • Added the sending of a startup event message that is sent each time the imagenode is restarted.
  • Added code and docs to support DHT11 & DHT22 temperature / humidity sensors (Thanks to @sbkirby.)
  • Added yaml options, code and docs for the full range of PiCamera settings (Thanks to @sbkirby.)
  • Added a receive_test.py program to enable FPS timed testing of different SendQueue alternatives. Made the receive_test.py Windows friendly by eliminating dependence on Linux signal SIGALRM.

Changes and Bugfixes

  • Made the detect_motion method work with both OpenCV v3.x and v4.x findContours() method. This method returns tuples of 2 or 3 values depending on the openCV version. The imagenode detect_motion method now works correctly with both OpenCV versions.

0.2.1 - 2020-07-10

Improvements

  • Added send_threading option to allow image sending to hub to happen in a separate thread. When this option is specified in the yaml settings file, camera capture and detection take place in the main thread and sending images via imageZMQ happens in a separate thread.
  • Reorganized previous docs/release-history.rst into this more standardized HISTORY.md file.
  • Updated Research and Development Roadmap.

Changes and Bugfixes

  • Fixed broken cv2.findCountours() when upgrading to OpenCV 4.x
  • Multiple fixes to all documentation files.

0.1.0 - 2019-01-30

Improvements

  • Added stall_watcher option and functionality to monitor whether main imagenode process has "stalled". End program if stall detected. Uses systemd service unit to restart after exit. Added the imagenode.service example systemd service unit file to main repository directory.
  • Added Release and Version History.
  • Added Research and Development Roadmap.

Changes and Bugfixes

  • Multiple fixes to all documentation files.

0.0.2 - 2018-12-15

Improvements

  • Added exposure_mode option to allow choosing PiCamera exposure_mode. Very helpful with Infrared PiCamera "Noir" and infrared lights.

Changes and Bugfixes

  • Conditionally import GPIO only if needed. Fixes import error when GPIO pins not used, or when running NOT on a Raspberry Pi.
  • Fixed a number of documentation broken links and formatting errors.
  • Multiple fixes to all documentation files.
  • Restructured test files & testing documentation to make them consistent.

0.0.1 - 2018-11-15

  • First commit to GitHub
  • Major refactoring after 13 months of testing previous version.
  • Includes motion detector, light detector, temperature sensor, LED light control via GPIO pins.

0.0.0 - 2017-10-09

  • First early prototype of imagenode running on 2 RPi's with 1 imagehub.

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