Search Results for author: Yee Hui Lee

Found 34 papers, 18 papers with code

A Depth-Adaptive Filtering Method for Effective GPR Tree Roots Detection in Tropical Area

no code implementations30 May 2023 Wenhao Luo, Yee Hui Lee, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yucel

The technique is successfully validated using SFCW GPR data from actual sites in a tropical area with different soil moisture levels, and the two-dimensional (2D) radar map of subsurface root systems is highly improved compared to existing methods.

GPR

3DInvNet: A Deep Learning-Based 3D Ground-Penetrating Radar Data Inversion

1 code implementation9 May 2023 Qiqi Dai, Yee Hui Lee, Hai-Han Sun, Genevieve Ow, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yucel

The reconstruction of the 3D permittivity map from ground-penetrating radar (GPR) data is of great importance for mapping subsurface environments and inspecting underground structural integrity.

3D Reconstruction Denoising +1

A Deep Learning-Based GPR Forward Solver for Predicting B-Scans of Subsurface Objects

no code implementations13 Jul 2022 Qiqi Dai, Yee Hui Lee, Hai-Han Sun, Jiwei Qian, Genevieve Ow, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yucel

To alleviate the computational burden, a deep learning-based 2D GPR forward solver is proposed to predict the GPR B-scans of subsurface objects buried in the heterogeneous soil.

GPR Transfer Learning

Accurate Tree Roots Positioning and Sizing over Undulated Ground Surfaces by Common Offset GPR Measurements

no code implementations27 May 2022 Wenhao Luo, Yee Hui Lee, Lai Fern Ow, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yucel

Normally, the ground surface above the tree roots is assumed to be flat, and standard processing methods based on hyperbolic fitting are applied to the hyperbolae reflection patterns of tree roots for detection purposes.

GPR

Dual-Cross-Polarized GPR Measurement Method for Detection and Orientation Estimation of Shallowly Buried Elongated Object

no code implementations17 May 2022 Hai-Han Sun, Yee Hui Lee, Wenhao Luo, Lai Fern Ow, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yucel

In addition, we present a dual-cross-polarized orientation estimation (DCPOE) algorithm to estimate the object orientation from the two cross-polarized data.

GPR Object

DMRF-UNet: A Two-Stage Deep Learning Scheme for GPR Data Inversion under Heterogeneous Soil Conditions

no code implementations16 May 2022 Qiqi Dai, Yee Hui Lee, Hai-Han Sun, Genevieve Ow, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yucel

In the first stage, a U-shape DNN with multi-receptive-field convolutions (MRF-UNet1) is built to remove the clutters due to inhomogeneity of the heterogeneous soil.

GPR

SFCW GPR tree roots detection enhancement by time frequency analysis in tropical areas

no code implementations6 Apr 2022 Wenhao Luo, Yee Hui Lee, Abdulkadir C. Yucel, Genevieve Ow, Mohamed Lokman Mohd Yusof

In high moisture tropical areas such as Singapore, tree fall due to root rot can cause loss of lives and properties.

GPR

Estimating Parameters of the Tree Root in Heterogeneous Soil Environments via Mask-Guided Multi-Polarimetric Integration Neural Network

no code implementations27 Dec 2021 Hai-Han Sun, Yee Hui Lee, Qiqi Dai, Chongyi Li, Genevieve Ow, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yucel

However, the task of estimating root-related parameters is challenging as the root reflection is a complex function of multiple root parameters and root orientations.

GPR

Monitoring Atmospheric Pollutants From Ground-based Observations

no code implementations21 Oct 2021 Nicholas Danesi, Mayank Jain, Yee Hui Lee, Soumyabrata Dev

Remote sensing analysts continuously monitor the amount of pollutants in the atmosphere.

Position

Detecting Blurred Ground-based Sky/Cloud Images

1 code implementation19 Oct 2021 Mayank Jain, Navya Jain, Yee Hui Lee, Stefan Winkler, Soumyabrata Dev

To the best of our knowledge, our approach is the first of its kind in the automatic identification of blurred images for ground-based sky/cloud images.

The Orientation Estimation of Elongated Underground Objects via Multi-Polarization Aggregation and Selection Neural Network

no code implementations29 Jan 2021 Hai-Han Sun, Yee Hui Lee, Chongyi Li, Genevieve Ow, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yucel

The horizontal orientation angle and vertical inclination angle of an elongated subsurface object are key parameters for object identification and imaging in ground penetrating radar (GPR) applications.

GPR Object

Forecasting Precipitable Water Vapor Using LSTMs

1 code implementation26 Jun 2020 Mayank Jain, Shilpa Manandhar, Yee Hui Lee, Stefan Winkler, Soumyabrata Dev

Long-Short-Term-Memory (LSTM) networks have been used extensively for time series forecasting in recent years due to their ability of learning patterns over different periods of time.

Time Series Time Series Forecasting

Subjective Quality Assessment of Ground-based Camera Images

no code implementations16 Dec 2019 Lucie Lévêque, Soumyabrata Dev, Murhaf Hossari, Yee Hui Lee, Stefan Winkler

Image quality assessment is critical to control and maintain the perceived quality of visual content.

Image Quality Assessment

Estimating Solar Irradiance Using Sky Imagers

1 code implementation11 Oct 2019 Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler

Unlike pyranometers, such sky images contain information about cloud coverage and can be used to derive cloud movement.

CloudSegNet: A Deep Network for Nychthemeron Cloud Image Segmentation

1 code implementation16 Apr 2019 Soumyabrata Dev, Atul Nautiyal, Yee Hui Lee, Stefan Winkler

In the existing literature, however, analysis of daytime and nighttime images is considered separately, mainly because of differences in image characteristics and applications.

Cloud Detection Image Segmentation +2

Analyzing Solar Irradiance Variation From GPS and Cameras

1 code implementation19 Apr 2018 Shilpa Manandhar, Soumyabrata Dev, Yee Hui Lee, Yu Song Meng

The total amount of solar irradiance falling on the earth's surface is an important area of study amongst the photo-voltaic (PV) engineers and remote sensing analysts.

High-Dynamic-Range Imaging for Cloud Segmentation

1 code implementation2 Mar 2018 Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler

It is thus difficult to capture the details of an entire scene with a regular camera in a single shot.

Benchmarking Image Generation +2

Correlating Satellite Cloud Cover with Sky Cameras

1 code implementation24 Aug 2017 Shilpa Manandhar, Soumyabrata Dev, Yee Hui Lee, Yu Song Meng

The role of clouds is manifold in understanding the various events in the atmosphere, and also in studying the radiative balance of the earth.

Study of Clear Sky Models for Singapore

1 code implementation24 Aug 2017 Soumyabrata Dev, Shilpa Manandhar, Yee Hui Lee, Stefan Winkler

The estimation of total solar irradiance falling on the earth's surface is important in the field of solar energy generation and forecasting.

Analyzing Cloud Optical Properties Using Sky Cameras

1 code implementation24 Aug 2017 Shilpa Manandhar, Soumyabrata Dev, Yee Hui Lee, Yu Song Meng

It is important to study the various cloud properties, as it impacts the total solar irradiance falling on the earth's surface.

Nighttime sky/cloud image segmentation

1 code implementation30 May 2017 Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler

An accurate segmentation of sky/cloud images is already challenging because of the clouds' non-rigid structure and size, and the lower and less stable illumination of the night sky increases the difficulty.

Image Segmentation Segmentation +1

Design of low-cost, compact and weather-proof whole sky imagers for high-dynamic-range captures

1 code implementation19 Apr 2017 Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler

Ground-based whole sky imagers are popular for monitoring cloud formations, which is necessary for various applications.

Cloud Radiative Effect Study Using Sky Camera

1 code implementation15 Mar 2017 Soumyabrata Dev, Shilpa Manandhar, Feng Yuan, Yee Hui Lee, Stefan Winkler

weather reporting, climate forecasting, and solar energy generation.

Systematic study of color spaces and components for the segmentation of sky/cloud images

1 code implementation17 Jan 2017 Soumyabrata Dev, Yee Hui Lee, Stefan Winkler

Sky/cloud imaging using ground-based Whole Sky Imagers (WSI) is a cost-effective means to understanding cloud cover and weather patterns.

Clustering Segmentation

Rough Set Based Color Channel Selection

1 code implementation3 Nov 2016 Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler

Color channel selection is essential for accurate segmentation of sky and clouds in images obtained from ground-based sky cameras.

Segmentation

Detecting Rainfall Onset Using Sky Images

no code implementations21 Oct 2016 Soumyabrata Dev, Shilpa Manandhar, Yee Hui Lee, Stefan Winkler

Ground-based sky cameras (popularly known as Whole Sky Imagers) are increasingly used now-a-days for continuous monitoring of the atmosphere.

Short-term prediction of localized cloud motion using ground-based sky imagers

no code implementations21 Oct 2016 Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler

Fine-scale short-term cloud motion prediction is needed for several applications, including solar energy generation and satellite communications.

motion prediction Optical Flow Estimation

Estimation of solar irradiance using ground-based whole sky imagers

1 code implementation8 Jun 2016 Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler

Ground-based whole sky imagers (WSIs) can provide localized images of the sky of high temporal and spatial resolution, which permits fine-grained cloud observation.

WAHRSIS: A Low-cost, High-resolution Whole Sky Imager With Near-Infrared Capabilities

1 code implementation21 May 2016 Soumyabrata Dev, Florian M. Savoy, Yee Hui Lee, Stefan Winkler

Cloud imaging using ground-based whole sky imagers is essential for a fine-grained understanding of the effects of cloud formations, which can be useful in many applications.

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