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Digital Image Correlation in Python

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# µDIC: A Python toolkit for Digital Image Correlation (DIC)
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## Overview
This project aims at providing a “batteries included” toolkit for digital image correlation in Python. 
The functionality you need to perform digital image correlation on experimental data as well as for doing virtual experiments are included.

![alt text](https://raw.githubusercontent.com/PolymerGuy/muDIC/master/documentation/examples/figures/GIF.gif)![alt text](https://raw.githubusercontent.com/PolymerGuy/muDIC/master/documentation/examples/figures/GIF_mesh.gif)

Typical usage is demonstrated in the examples located in the /Examples folder.

This toolkit includes the following:
* Image reader tools
* Virtual lab
    * Speckle image generators
    * Image deformation tools
    * Noise injection
    * Image down-sampling
* B-spline finite elements
    * Arbitrary polynomial order
    * Knot vectors can be manipulated
* Meshing tools:
    * A light weight GUI for structured meshing
* Image correlation routines:
    * Non linear least squares solver
* Post processor
    * Calculates most popular strain measures
    * Light weight visualization
* Logging
 
## Release notes
The following changes were done in version 0.2.0:
* Added Q4 element support
* Q4 elements are now the default
* Removed uneccessary scaling when images are deformed using displacement functions
* Added quiver plots for displacements
* Python 2.7 is no longer supported
* Removed Perlin noise support as the package is only available for Python 2.7
* Various bug fixes (See commit history)

## Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.
### Prerequisites
This toolkit is tested on Python 3.7 and need all dependencies listen in requirements.txt

### Installing

#### Installing by a package manager:
Make sure you have Python 3 installed with pip and virtualenv

Make new folder and use a terminal to make a virtual environment:
```
$ python -m venv env
$ source env/bin/activate #On Linux and Mac OS
$ env\Scripts\activate.bat #On Windows
```
We can now install µDIC inside this environment using pip
```
$ pip install muDIC
```
Now, lets run all the tests included by using nosetests
```
$ nosetests muDIC
```

#### Installing by cloning the repos:
Start to clone this repo to your preferred location:
```
$ cd /path/to/project/
$ git init
$ git clone https://github.com/PolymerGuy/muDIC.git
```

We recommend that you always use virtual environments, either by virtualenv or by Conda env

Virtual env:
```
$ cd /path/to/muDIC
$ python -m venv env
$ source ./env/bin/activate #On Linux and Mac OS
$ env\Scripts\activate.bat #On Windows
$ pip install -r requirements.txt
```

## Running the tests

The tests should always be launched to check your installation.

If you installed by a package manager:
```
$ nosetests muDIC #Note capital cases
```

If you cloned the repo:
```
$ cd /path/to/muDIC/
$ nosetests
```

## Documentation
Documentation is found here: [Read the docs](https://mudic.readthedocs.io/en/latest/)

## Our motivation
The motivation for this work was the need for a transparent code which could be modified and extended easily, without digging deep into C or C++ source code. The implementation is pure python with the exception of third-party packages such as Scipy, Numy etc.

## Contributing
Clone the repository, add your changes, add new tests and you are ready for a pull request

## Authors
* **Sindre Olufsen** - *Implementation* - [PolymerGuy](https://github.com/polymerguy)
* **Marius Endre Andersen** - *Wrote the Matlab code which was the starting point for this project*

## License
This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details

## Citing this project
This project is described in the following paper and citation is highly appreciated
[µDIC: An open-source toolkit for digital image correlation](https://doi.org/10.1016/j.softx.2019.100391)

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