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Yonghoon Ji

9 accepted papers

2024

Acoustic-N-Point for Solving 2D Forward Looking Sonar Pose Estimation

RA-L 2024

2D forward looking sonar (FLS) has gained widespread application in underwater robotics research, primarily due to its capacity to produce high-resolution images in diverse aquatic environments. This study deals with pose estimation with given 3D positions and corresponding 2D pixels, which is a fun

Cited by 8SourceScholar
2023

Motion Degeneracy in Self-supervised Learning of Elevation Angle Estimation for 2D Forward-Looking Sonar

IROS 2023poster

2D forward-looking sonar is a crucial sensor for underwater robotic perception. A well-known problem in this field is estimating missing information in the elevation direction during sonar imaging. There are demands to estimate 3D information per image for 3D mapping and robot navigation during fly-…

Cited by 7SourceScholar
2022

Learning Pseudo Front Depth for 2D Forward-Looking Sonar-based Multi-view Stereo

IROS 2022poster

Retrieving the missing dimension information in acoustic images from 2D forward-looking sonar is a well-known problem in the field of underwater robotics. There are works attempting to retrieve 3D information from a single image which allows the robot to generate 3D maps with fly-through motion. How…

Cited by 13SourcecodeScholar
2021

Elevation Angle Estimation in 2D Acoustic Images Using Pseudo Front View

RA-L 2021

A novel method to estimate the missing dimension in 2D acoustic images for 3D reconstruction is proposed in this paper. Acoustic cameras can acquire high resolution 2D images in underwater environment insusceptible to water turbidity and light condition. However, the formulation of acoustic images l

Cited by 39SourceScholar
2020

ACMarker: Acoustic Camera-Based Fiducial Marker System in Underwater Environment

RA-L 2020

ACMarker is an acoustic camera-based fiducial marker system designed for underwater environments. Optical camera-based fiducial marker systems have been widely used in computer vision and robotics applications such as augmented reality (AR), camera calibration, and robot navigation. However, in unde

Cited by 21SourceScholar
2018

Line-Based Global Localization of a Spherical Camera in Manhattan Worlds

ICRA 2018poster

Localization is an important task for mobile service robots in indoor spaces. In this research, we propose a novel technique for indoor localization using a spherical camera. Spherical cameras can obtain a complete view of the surroundings allowing the use of global environmental information. We tak…

Cited by 22SourceScholar
2017

Lane-Change Detection Based on Vehicle-Trajectory Prediction

RA-L 2017

We propose a new detection method to predict a vehicle's trajectory and use it for detecting lane changes of surrounding vehicles. According to the previous research, more than 90% of the car crashes are caused by human errors, and lane changes are the main factor. Therefore, if a lane change can be

Cited by 126SourceScholar
2015

Fuzzy based traversability analysis for a mobile robot on rough terrain

ICRA 2015poster

We present a novel rough terrain traversability analysis method for mobile robot navigation. We focused on the scenario of mobile robot operation in a disaster environment with limited sensor data. The robot builds a map in real time and analyzes the terrain traversability of its surrounding environ…

Cited by 46SourceScholar