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Open AccessProceedings ArticleDOI

The Cityscapes Dataset for Semantic Urban Scene Understanding

TLDR
This work introduces Cityscapes, a benchmark suite and large-scale dataset to train and test approaches for pixel-level and instance-level semantic labeling, and exceeds previous attempts in terms of dataset size, annotation richness, scene variability, and complexity.
Abstract
Visual understanding of complex urban street scenes is an enabling factor for a wide range of applications. Object detection has benefited enormously from large-scale datasets, especially in the context of deep learning. For semantic urban scene understanding, however, no current dataset adequately captures the complexity of real-world urban scenes. To address this, we introduce Cityscapes, a benchmark suite and large-scale dataset to train and test approaches for pixel-level and instance-level semantic labeling. Cityscapes is comprised of a large, diverse set of stereo video sequences recorded in streets from 50 different cities. 5000 of these images have high quality pixel-level annotations, 20 000 additional images have coarse annotations to enable methods that leverage large volumes of weakly-labeled data. Crucially, our effort exceeds previous attempts in terms of dataset size, annotation richness, scene variability, and complexity. Our accompanying empirical study provides an in-depth analysis of the dataset characteristics, as well as a performance evaluation of several state-of-the-art approaches based on our benchmark.

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Fluid Annotation: A Human-Machine Collaboration Interface for Full Image Annotation

TL;DR: Fluid Annotation as discussed by the authors is an intuitive human-machine collaboration interface for annotating the class label and outline of every object and background region in an image, which is based on three principles: strong machine-learning aid, strong machine learning aid, and empower the annotator.
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ABMDRNet: Adaptive-weighted Bi-directional Modality Difference Reduction Network for RGB-T Semantic Segmentation

TL;DR: Zhang et al. as discussed by the authors proposed an Adaptive-weighted Bi-directional Modality Difference Reduction Network (ABMDRNet) to reduce the modality differences between RGB and thermal features.
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Monocular 3D Object Detection with Pseudo-LiDAR Point Cloud

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Physics-Based Rendering for Improving Robustness to Rain

TL;DR: A physically-based rain rendering pipeline for realistically inserting rain into clear weather images is presented, and refining existing networks with the authors' augmented images improves the robustness of both object detection and semantic segmentation algorithms.
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Depth Completion from Sparse LiDAR Data with Depth-Normal Constraints

TL;DR: A unified CNN framework is proposed that models the geometric constraints between depth and surface normal in a diffusion module and predicts the confidence of sparse LiDAR measurements to mitigate the impact of noise.
References
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Proceedings Article

Very Deep Convolutional Networks for Large-Scale Image Recognition

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What is city scene understanding?

City scene understanding involves pixel-level and instance-level semantic labeling in urban environments. The Cityscapes dataset provides a benchmark for training and testing approaches in this area.