ankurguria / Semantic-Segmentation-Off-Road-Robotics-RELLIS-3D

Semantic Segmentation of a multi-modal dataset for Off-Road Robotics (RELLIS-3D)

Semantic Segmentation of a multi-modal dataset for Off-Road Robotics (RELLIS-3D)

• Paper

Author

• Ankur Guria

Detailed REPORT of out project

Objective

In this project, we have tried to perform semantic segmentation i.e. pixel-wise classification of a digital image to partition it into multiple segments, of a multimodal dataset collected in an off-road environment, RELLIS-3D, which contains annotations for 13,556 LiDAR scans and 6,235 images. We have used the images only. The data was collected on the Rellis Campus of Texas A&M University. It comprises 20 classes viz. sky, grass, tree, bush, concrete, mud, person, puddle, rubble, barrier, log, fence, vehicle, object, pole, water, asphalt, and building. Our objective is to design a lightweight (computationally less expensive) algorithm to solve the above problem to be able to get higher frames per second while running the algorithm in real-time.

DATASET

Code: Please send an email stating your purpose @ [e-mail]

Approach schematic

Experiment (best performance)

• We used DeepLabV3Plus and FPN for the 3-class segmentation.
• Trained DeepLabV3Plus, FPN, and LinkNet separately for the Traversable class segmentation.
• We experimented with weighted averaging and stacking ensembling techniques to combine the predictions of the sub-models.
• DeepLabV3Plus and FPN were implemented as meta-learners in stacking.
• Tversky loss, Focal Tversky loss, and Dice loss functions were tried in both the 3-class segmentation, base learner, and meta-learner network of stacking ensembles.

Results

Predictions

References:

• Liang-Chieh Chen, Yukun Zhu, George Papandreou, Florian Schroff, and Hartwig Adam: Encoder-Decoder with Atrous Separable Convolution for Semantic Image Segmentation: arXiv: 1802.02611
• Abhishek Chaurasia, Eugenio Culurciello: LinkNet: Exploiting Encoder Representations for Efficient Semantic Segmentation: arXiv: 1707.03718
• Tsung-Yi Lin, Piotr Dollar, Ross Girshick, Kaiming He, Bharath Hariharan, and Serge Belongie: Feature Pyramid Networks for Object Detection: arXiv: 1612.03144
• Hengshuang Zhao, Jianping Shi, Xiaojuan Qi, Xiaogang Wang, Jiaya Jia: Pyramid Scene Parsing Network: arXiv: 1612.01105: Riyaz Sikora, O'la Hmoud Al-laymoun: A Modified Stacking Ensemble Machine Learning Algorithm Using Genetic Algorithms