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The Harvesters

Pieter Bruegel the Elder, The Harvesters, 1565, (c) The Metropolitan Museum of Art

https://readthedocs.org/projects/harvesters/badge/?version=latest

About Harvester

Harvester is a Python library that aims to make the image acquisition process in your computer vision application breathtakingly easy. Like the peasants/harvesters in the above drawing, it gathers the image data as its harvest and fills up your bucket/buffer.

You can freely use, modify, distribute Harvester under Apache License-2.0 without worrying about the use of your software: personal, internal or commercial.

Tasks Harvester Does for You

The main features of Harvester are:

  • Image acquisition through GenTL Producers
  • Multiple loading of GenTL Producers in a single Python script
  • GenICam feature node manipulation

Note that the second item implies you can involve various types of transport layers in your Python script. Each transport layer has own advantages and disadvantages and you should choose appropriate one based on your application's requirement. You just need to acquire images for some purposes and the GenTL Producers deliver the images somehow. It truly is the great benefit of the GenTL Standard! And of course, not only GenTL Producers but Harvester offer you a way to manipulate multiple GenICam compliant entities such as a camera in a single Python script with an intuitive manner.

Need a GUI?

Do you need a GUI? Harvester has a sister project that is called Harvester GUI. Please visit there if you are interested in it:

https://github.com/genicam/harvesters_gui

Image data visualizer

Asking Questions

We have prepared an FAQ page. Perhaps your issue could be resolved just reading through it:

https://github.com/genicam/harvesters/wiki/FAQ

If any article was not mentioning about the issue you are facing, please try to visit the following page and check if there's a ticket that is relevant to the issue. If nothing has been mentioned yet, feel free to create an issue ticket so that we can help you:

https://github.com/genicam/harvesters/issues

Links

Documentation https://harvesters.readthedocs.io/en/latest/
Digital Object Identifier https://zenodo.org/record/3554804#.Xd4HSi2B01I
EMVA website https://www.emva.org/standards-technology/genicam/genicam-downloads/
Harvester GUI https://github.com/genicam/harvesters_gui
Issue tracker https://github.com/genicam/harvesters/issues
PyPI https://pypi.org/project/harvesters/
Source repository https://github.com/genicam/harvesters

Harvester on IPython

The following code block shows Harvester is running on IPython. An acquired image is delivered as the payload of a buffer and the buffer can be fetched by calling the fetch method of the ImageAcquirer class. Once you get an image you should be able to immediately start image processing. If you're running on the Jupyter notebook, you should be able to visualize the image data using Matplotlib. This step should be helpful to check what's going on your trial in the image processing flow.

(genicam) kznr@Kazunaris-MacBook:~% ipython
Python 3.6.6 |Anaconda, Inc.| (default, Jun 28 2018, 11:07:29)
Type 'copyright', 'credits' or 'license' for more information
IPython 6.5.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: from harvesters.core import Harvester

In [2]: import numpy as np  # This is just for a demonstration.

In [3]: h = Harvester()

In [4]: h.add_file('/Users/kznr/dev/genicam/bin/Maci64_x64/TLSimu.cti')

In [5]: h.update()

In [6]: len(h.device_info_list)
Out[6]: 4

In [7]: h.device_info_list[0]
Out[7]: {'display_name': 'TLSimuMono (SN_InterfaceA_0)', 'id_': 'TLSimuMono', 'model': 'TLSimuMono', 'serial_number': 'SN_InterfaceA_0', 'tl_type': 'Custom', 'user_defined_name': 'Center', 'vendor': 'EMVA_D', 'version': '1.2.3'}

In [8]: ia = h.create(0)

In [9]: ia.remote_device.node_map.Width.value = 8

In [10]: ia.remote_device.node_map.Height.value = 8

In [11]: ia.remote_device.node_map.PixelFormat.value = 'Mono8'

In [12]: ia.start()

In [13]: with ia.fetch() as buffer:
    ...:     # Let's create an alias of the 2D image component:
    ...:     component = buffer.payload.components[0]
    ...:
    ...:     # Note that the number of components can be vary. If your
    ...:     # target remote device transmits a multi-part information, then
    ...:     # you'd get two or more components in the payload. However, now
    ...:     # we're working with a remote device that transmits only a 2D image.
    ...:     # So we manipulate only index 0 of the list object, components.
    ...:
    ...:     # Let's see the acquired data in 1D:
    ...:     _1d = component.data
    ...:     print('1D: {0}'.format(_1d))
    ...:
    ...:     # Reshape the NumPy array into a 2D array:
    ...:     _2d = component.data.reshape(
    ...:         component.height, component.width
    ...:     )
    ...:     print('2D: {0}'.format(_2d))
    ...:
    ...:     # Here are some trivial calculations:
    ...:     print(
    ...:         'AVE: {0}, MIN: {1}, MAX: {2}'.format(
    ...:             np.average(_2d), _2d.min(), _2d.max()
    ...:         )
    ...:     )
    ...:
1D: [123 124 125 126 127 128 129 130 124 125 126 127 128 129 130 131 125 126
 127 128 129 130 131 132 126 127 128 129 130 131 132 133 127 128 129 130
 131 132 133 134 128 129 130 131 132 133 134 135 129 130 131 132 133 134
 135 136 130 131 132 133 134 135 136 137]
2D: [[123 124 125 126 127 128 129 130]
 [124 125 126 127 128 129 130 131]
 [125 126 127 128 129 130 131 132]
 [126 127 128 129 130 131 132 133]
 [127 128 129 130 131 132 133 134]
 [128 129 130 131 132 133 134 135]
 [129 130 131 132 133 134 135 136]
 [130 131 132 133 134 135 136 137]]
AVE: 130.0, MIN: 123, MAX: 137

In [14]: ia.stop()

In [15]: ia.destroy()

In [16]: h.reset()

In [17]: quit
(genicam) kznr@Kazunaris-MacBook:~%

Terminology

Before start talking about the detail, let's take a look at some important terminologies that frequently appear in this document. These terminologies are listed as follows:

  • The GenApi-Python Binding: A Python module that communicates with the GenICam GenApi reference implementation.
  • A GenTL Producer: A library that has C interface and offers consumers a way to communicate with cameras over physical transport layer dependent technology hiding the detail from the consumer.
  • The GenTL-Python Binding: A Python module that communicates with GenTL Producers.
  • Harvester: An image acquisition engine.
  • Harvester GUI: A Harvester-based graphical user interface.
  • A GenICam compliant device: It's typically a camera. Just involving the GenICam reference implementation, it offers consumers a way to dynamically configure/control the target remote devices.

The following diagram shows the hierarchy and relationship of the relevant modules:

Module hierarchy

Getting Started with Harvester

Are you ready to start working with Harvester? You can learn some more topics on these pages:

  • INSTALL.rst: Learn how to install Harvester and its prerequisites.
  • TUTORIAL.rst: Learn how Harvester can be used on a typical image acquisition workflow.

Open Source Resources

Harvester uses the following open source libraries/resources:

Acknowledgement

The following individuals have directly or indirectly contributed to the development activity of Harvester; they truly are wonderful GenICam colleagues:

Rod Barman, Stefan Battmer, David Beek, Jan Becvar, David Bernecker, Chris Beynon, Eric Bourbonnais, Benedikt Busch, George Chamberlain, Thomas Detjen, Friedrich Dierks, Dana Diezemann, Emile Dodin, Reynold Dodson, Sascha Dorenbeck, Jozsa Elod, Erik Eloff, Katie Ensign, Andreas Ertl, James Falconer, Werner Feith, Maciej Gara, Andreas Gau, Sebastien Gendreau, Francois Gobeil, Werner Goeman, Jean-Paul Goglio, Markus Grebing, Eric Gross, Ioannis Hadjicharalambous, Uwe Hagmaier, Tim Handschack, Christopher Hartmann, Reinhard Heister, Gerhard Helfrich, Jochem Herrmann, Heiko Hirschmueller, Tom Hopfner, David Hoese, Karsten Ingeman Christensen, Severi Jaaskelainen, Alfred Johannesson, Mattias Johannesson, Mark Jones, Mattias Josefsson, Martin Kersting, Stephan Kieneke, Tom Kirchner, Lutz Koschorreck, Frank Krehl, Maarten Kuijk, Max Larin, Ralf Lay, Min Liu, Sergey Loginonvskikh, Thomas Lueck, Alain Marchand, Rocco Matano, Masahide Matsubara, Stephane Maurice, Robert McCurrach, Mike Miethig, Thies Moeller, Roman Moie, Katsura Muramatsu, Marcel Naggatz, Hartmut Nebelung, Damian Nesbitt, Quang Nhan Nguyen, Klaus-Henning Noffz, Jonas Olofsson, Neerav Patel, Jan Pech, Merlin Plock, Joerg Preckwinkel, Benjamin Pussacq, Dave Reaves, Thomas Reuter, Gordon Rice, Andreas Rittinger, Ryan Robe, Nicolas P. Rougier, Felix Ruess, Matthias Schaffland, Michael Schmidt, Jan Scholze, Martin Schwarzbauer, Rupert Stelz, Madhura Suresh, Chendra Hadi Suryanto, Andrew Wei Chuen Tan, Timo Teifel, Albert Theuwissen, Laval Tremblay, Tim Vlaar, Silvio Voitzsch, Stefan Von Weihe, Frederik Voncken, Roman Wagner, Ansger Waschki, Anne Wendel, Michael Williamson, Jean-Michel Wintgens, Manfred Wuetschner, Jang Xu, Christoph Zierl, Sebastian Yap, and Juraj Zopp