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Chianti

This is a Python library for loading and augmenting training data asynchronously in the background. It is primarily geared towards pipelines for semantic segmentation where you have a source image and a densely annotated target image.

The library consists of four major components:

A set of image loaders that provide the raw image data.
A set of iterators that determine the order in which we iterate over a given dataset
A set of augmentors for synthetically increasing the diversity of the data set.
A data provider that connects all components and returns batches of augmented images.

Installation

You need to have OpenCV and Boost installed.

$ sudo apt-get install libopencv-dev libboost-all-dev

Check out the repository.

$ git clone https://github.com/TobyPDE/chianti

Now, change into the directory and create a build folder.

$ cd chianti
$ mkdir build
$ cd build

Depending on your Python version (2.7 or 3.4), execute one of the two following commands

$ cmake .. -Dpython_version=2 -DCMAKE_BUILD_TYPE=Release

$ cmake .. -Dpython_version=3 -DCMAKE_BUILD_TYPE=Release

Build the library and the Python bindings.

$ make -j

Install the library system-wide.

$ sudo make install

Documentation

Read here: http://chianti.readthedocs.io/en/latest/

Usage

Assume that files is a list of filename tuples. The first entry of each entry is the filename of the source image while the second entry is the target filename. Then the following creates a new data provider that iterates in epochs randomly over files. The pre-processing step consists of subsampling the images by a factor of 4.

batch_size = 3
num_classes = 19
return pychianti.DataProvider(
    pychianti.Augmentor.Subsample(4),
    pychianti.Loader.RGB(),
    pychianti.Loader.Label(),
    pychianti.Iterator.Sequential(files),
    batch_size,
    num_classes)

License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.