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https://github.com/fabianschenk/REVO

Robust Edge-based Visual Odometry (REVO)
https://github.com/fabianschenk/REVO

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Robust Edge-based Visual Odometry (REVO)

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# Robust Edge-based Visual Odometry (REVO)



**Please note that the code is still in the testing phase.**



In this work, we present a robust edge-based visual odometry (REVO) system for RGBD sensors. Edges are more stable under varying lighting conditions than raw intensity values, which leads to higher accuracy and robustness in scenes, where feature- or photoconsistency-based approaches often fail. The results show that our method performs best in terms of trajectory accuracy for most of the sequences indicating that edges are suitable for a multitude of scenes.



## If you use this work, please cite any of the following publications:

* **Combining Edge Images and Depth Maps for Robust Visual Odometry**, Schenk Fabian, Fraundorfer Friedrich, BMVC 2017, [pdf](https://pure.tugraz.at/portal/files/10383987/0661.pdf),[video](https://youtu.be/uj3rRyqSEnQ)

* **Robust Edge-based Visual Odometry using Machine-Learned Edges**, Schenk Fabian, Fraundorfer Friedrich, IROS 2017, [pdf](https://pure.tugraz.at/portal/files/11216598/schenk_paper_final.pdf), [video](https://youtu.be/PUTV9vsdpbA)



## License

REVO is licensed under the [GNU General Public License Version 3 (GPLv3)](http://www.gnu.org/licenses/gpl.html).



If you want to use this software commercially, please contact us.

## Building the framework

So far, the framework has only been built and tested on the following system.

### Requirements

* [Ubuntu 16.04, 15.10, 17.04](https://www.ubuntu.com/)

* [OpenCV > 3](http://opencv.org/)

* [Eigen > 3.3](http://eigen.tuxfamily.org/index.php?title=Main_Page)



[Sophus](https://github.com/strasdat/Sophus) is now part of this repository (in thirdparty/Sophus).



Building on Windows and backwards compatibility might be added in the future.



### Optional

Set the optional packages in the cmake-gui

* [Pangolin](https://github.com/stevenlovegrove/Pangolin)  (for graphical viewer)

* Intel RealSense ZR300 (see below)

* Orbbec Astra Pro (see below)



### Build commands

```bash

git clone REVO

cd REVO

mkdir build

cd build

cmake . ..

make -j

```



## How to reproduce the results from the paper

### [TUM dataset](https://vision.in.tum.de/data/datasets/rgbd-dataset)

Download the sequence you want to test and specify the "associate.txt" file in the dataset_tumX.yaml settings file.



To generate an "associate.txt" file, first download the "associate.py" script from [TUM RGBD Tools](https://svncvpr.in.tum.de/cvpr-ros-pkg/trunk/rgbd_benchmark/rgbd_benchmark_tools/src/rgbd_benchmark_tools/) and then run

```bash

python associate.py DATASET_XXX/rgb.txt DATASET_XXX/depth.txt > associate.txt

```

in the folder, where your dataset is.

 

In the "REVO" directory:

```bash

build/REVO config/revo_settings.yaml config/dataset_tum1.yaml

```

For evaluation of the absolute trajectory error (ATE) and relative pose error (RPE) download the corresponding scripts from [TUM RGBD Tools](https://svncvpr.in.tum.de/cvpr-ros-pkg/trunk/rgbd_benchmark/rgbd_benchmark_tools/src/rgbd_benchmark_tools/).

## Supported Sensors

REVO supports three different sensors at the moment:

* [Orbbec Astra Pro Sensor](https://orbbec3d.com/product-astra-pro/)

* [Orbbec Astra Sensor](https://orbbec3d.com/product-astra/)

* [Intel Realsense ZR300 (other versions are untested!)](https://click.intel.com/intelr-realsensetm-development-kit-featuring-the-zr300.html)



For the Intel sensor set "WITH_REALSENSE", for the Orbbec Astra Pro set "WITH_ORBBEC_FFMPEG" (recommended) or "WITH_ORBBEC_UVC" (not recommended, requires third party tools) and for the non-pro Orbbec Astra set "WITH_ORBBEC_OPENNI"!

**Note:** Make sure that you set the USB rules in a way that the sensor is accessible for every user (default is root only).



REVO can be compiled for all three sensors only if WITH_REALSENSE, WITH_ORBBEC_FFMPEG and WITH_ORBBEC_OPENNI are set.

If WITH_ORRBEC_UVC is set, there is a conflict with the librealsense!

To solve this issue, use WITH_ORBBEC_FFMPEG!



The sensor to be used is determined from the INPUT_TYPE set in the second config file.

For Orbbec Astra Pro INPUT_TYPE: 1, for Intel Realsense INPUT_TYPE: 2 and for Orbbec Astra INPUT_TYPE: 3.



Example config files for all three sensors can be found in the config directory!

### Intel RealSense ZR300

Install [librealsense](https://github.com/IntelRealSense/librealsense), set the intrinsic parameters in the config file.

This framework was tested with the Intel RealSense ZR300.



### Orbbec Astra Sensor

The (non-pro) Orbbec Astra Sensor can be fully accessed by Orbbec's OpenNI driver.

First [download the openni driver](https://orbbec3d.com/develop/#registergestoos) and choose the correct *.zip file that matches your architecture, e.g. OpenNI-Linux_x64-2.3.zip. 

Extract it and copy libOpenNI2.so and the "Include" and "OpenNI2" folder to REVO_FOLDER/orbbec_astra_pro/drivers. 



### Orbbec Astra Pro Sensor

#### With FFMPEG

The standard OpenNI driver can only access the depth stream of the [Orbbec Astra Pro Sensor](https://orbbec3d.com/product-astra-pro/), thus we have to access the color stream via FFMPEG.

Install the newest FFMPEG version

```bash

sudo apt install ffmpeg

```

or download from [FFMPEG Github](https://www.ffmpeg.org/download.html).

#### With LibUVC (not recommended)

The standard OpenNI driver can only access the depth stream of the [Orbbec Astra Pro Sensor](https://orbbec3d.com/product-astra-pro/), thus we have to access the color stream like a common webcam.

*Note: We use libuvc because the standard webcam interface of [OpenCV](http://opencv.org/) buffers the images and doesn't always return the newest image.*



First [download the openni driver](https://orbbec3d.com/develop/#registergestoos) and choose the correct *.zip file that matches your architecture, e.g. OpenNI-Linux_x64-2.3.zip. 

Extract it and copy libOpenNI2.so and the "Include" and "OpenNI2" folder to REVO_FOLDER/orbbec_astra_pro/drivers. 



Then install [Olaf Kaehler's fork of libuvc](https://github.com/olafkaehler/libuvc) by performing the following steps in the main directory.

```bash

cd ThirdParty

git clone https://github.com/olafkaehler/libuvc

cd libuvc

mkdir build

cd build

cmake . ..

make -j

make install

```

## Troubleshooting

### Sophus

There was a problem with the old REVO version and a new Sophus version that introduced orthogonality checks for rotation matrices. 

If you face such an error, simply check out the current version of REVO.

### Orbbec with LIBUVC and Intel Realsense

If WITH_ORRBEC_UVC is set, there is a conflict with the librealsense! To solve this issue, use WITH_ORBBEC_FFMPEG!