Atanas Gotchev
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View article: Wavefront Coding for Accommodation-Invariant Near-Eye Displays
Wavefront Coding for Accommodation-Invariant Near-Eye Displays Open
We present a new computational near-eye display method that addresses the vergence-accommodation conflict problem in stereoscopic displays through accommodation-invariance. Our system integrates a refractive lens eyepiece with a novel wave…
View article: Snapshot Hyperspectral Imaging With Co-Designed Optics, Color Filter Array, and Unrolled Network
Snapshot Hyperspectral Imaging With Co-Designed Optics, Color Filter Array, and Unrolled Network Open
We propose a novel snapshot hyperspectral imaging method that incorporates co-designed optics, a color filter array (CFA), and an unrolled post-processing network through end-to-end learning. The camera optics consists of a fixed refractiv…
View article: Spectral Rendering: From Input to Rendering Process
Spectral Rendering: From Input to Rendering Process Open
Spectral rendering encompasses methods aimed at generating synthetic imagery with realistic color expression by simulating the interaction of light with different materials and wavelengths. Unlike conventional rendering methods that use tr…
View article: Optical Aberration Analysis of Light Field Displays: A Calibration Approach for Enhanced Performance
Optical Aberration Analysis of Light Field Displays: A Calibration Approach for Enhanced Performance Open
Aberrations in the optical system of a light field (LF) display can degrade its quality and affect the focusing effects in the retinal image, formed by the superposition of multiperspective LF views. To address this problem, we propose a m…
View article: JEI Updates Research Topic Categories
JEI Updates Research Topic Categories Open
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View article: Observed optical resolution of light field display: Empirical and simulation results
Observed optical resolution of light field display: Empirical and simulation results Open
Light field (LF) displays are a promising 3D display technology to mitigate the vergence-accommodation conflict. Recently, we have proposed a simulation framework to model an LF display system. It has predicted that the in-focus optical re…
View article: CIVIT dataset: Integral microscopy with Fourier plane recording
CIVIT dataset: Integral microscopy with Fourier plane recording Open
This article describes a dataset of synthetic images representing biological scenery as captured by a Fourier Lightfield Microscope (FLMic). It includes 22,416 images related to eight scenes composed of 3D models of objects typical for bio…
View article: Optical modelling of an accommodative light field display system and prediction of human eye responses
Optical modelling of an accommodative light field display system and prediction of human eye responses Open
The spatio-angular resolution of a light field (LF) display is a crucial factor for delivering adequate spatial image quality and eliciting an accommodation response. Previous studies have modelled retinal image formation with an LF displa…
View article: Design and manufacturing of an optimized retro reflective marker for photogrammetric pose estimation in ITER
Design and manufacturing of an optimized retro reflective marker for photogrammetric pose estimation in ITER Open
Retro reflective markers can remarkably aid photogrammetry tasks in challenging visual environments. They have been demonstrated to be key enablers of pose estimation for remote handling in ITER. However, the strict requirements of the ITE…
View article: Optical modelling of accommodative light field display system and prediction of human eye responses
Optical modelling of accommodative light field display system and prediction of human eye responses Open
The spatio-angular resolution of a light field (LF) display is a crucial factor for delivering adequate spatial image quality and eliciting an accommodation response. Previous studies have modelled retinal image formation with an LF displa…
View article: Bi-directional Loop Closure for Visual SLAM
Bi-directional Loop Closure for Visual SLAM Open
A key functional block of visual navigation system for intelligent autonomous vehicles is Loop Closure detection and subsequent relocalisation. State-of-the-Art methods still approach the problem as uni-directional along the direction of t…
View article: Accuracy evaluation of methods for pose estimation from fiducial markers
Accuracy evaluation of methods for pose estimation from fiducial markers Open
Estimating the pose from fiducial markers is a widely researched topic with practical importance for computer vision, robotics and photogrammetry. In this paper, we aim at quantifying the accuracy of pose estimation in real-world scenarios…
View article: Volumetric segmentation for integral microscopy with Fourier plane recording
Volumetric segmentation for integral microscopy with Fourier plane recording Open
Light Field (LF) microscopy has emerged as a fast-growing field of interest in recent years due to its undoubted capacity of capturing in-vivo samples from multiple perspectives. In this work, we present a framework for Volume Reconstructi…
View article: Learning Wavefront Coding for Extended Depth of Field Imaging
Learning Wavefront Coding for Extended Depth of Field Imaging Open
Depth of field is an important factor of imaging systems that highly affects the quality of the acquired spatial information. Extended depth of field (EDoF) imaging is a challenging ill-posed problem and has been extensively addressed in t…
View article: Retro-Reflective-Marker-Aided Target Pose Estimation in a Safety-Critical Environment
Retro-Reflective-Marker-Aided Target Pose Estimation in a Safety-Critical Environment Open
Visual technologies have an indispensable role in safety-critical applications, where tasks must often be performed through teleoperation. Due to the lack of stereoscopic and motion parallax depth cues in conventional images, alignment tas…
View article: Separation of the Electromyographic from the Electrocardiographic Signals and Vice Versa. A Topical Review of the Dynamic Procedure
Separation of the Electromyographic from the Electrocardiographic Signals and Vice Versa. A Topical Review of the Dynamic Procedure Open
Electrocardiographic (ECG) and electromyographic (EMG) signals are inevitably and simultaneously recorded from the same electrodes and are respectively useful signal and noise in electrocardiography, and vice versa in electromyography. The…
View article: FinnForest dataset: A forest landscape for visual SLAM
FinnForest dataset: A forest landscape for visual SLAM Open
This paper presents a novel challenging dataset that offers a new landscape of testing material for mobile robotics, autonomous driving research, and forestry operation. In contrast to common urban structures, we explore an unregulated nat…
View article: Self-Supervised Light Field Reconstruction Using Shearlet Transform and Cycle Consistency
Self-Supervised Light Field Reconstruction Using Shearlet Transform and Cycle Consistency Open
The image-based rendering approach using Shearlet Transform (ST) is one of the state-of-the-art Densely-Sampled Light Field (DSLF) reconstruction methods. It reconstructs Epipolar-Plane Images (EPIs) in image domain via an iterative regula…
View article: DRST: Deep Residual Shearlet Transform for Densely Sampled Light Field Reconstruction
DRST: Deep Residual Shearlet Transform for Densely Sampled Light Field Reconstruction Open
The Image-Based Rendering (IBR) approach using Shearlet Transform (ST) is one of the most effective methods for Densely-Sampled Light Field (DSLF) reconstruction. The ST-based DSLF reconstruction typically relies on an iterative thresholdi…
View article: A General Framework for Depth Compression and Multi-Sensor Fusion in Asymmetric View-Plus-Depth 3D Representation
A General Framework for Depth Compression and Multi-Sensor Fusion in Asymmetric View-Plus-Depth 3D Representation Open
We present a general framework which can handle different processing stages of the three-dimensional (3D) scene representation referred to as “view-plus-depth” (V+Z). The main component of the framework is the relation between the depth ma…
View article: Multi-View Camera Pose Estimation for Robotic Arm Manipulation
Multi-View Camera Pose Estimation for Robotic Arm Manipulation Open
This article proposes a novel approach aimed at estimating the pose of a camera, affixed to a robotic manipulator, against a target object. Our approach provides a way to exploit the redundancy of the robotic arm kinematics by directly con…
View article: Shearlet Transform-Based Light Field Compression Under Low Bitrates
Shearlet Transform-Based Light Field Compression Under Low Bitrates Open
Light field (LF) acquisition devices capture spatial and angular information of a scene. In contrast with traditional cameras, the additional angular information enables novel postprocessing applications, such as 3D scene reconstruction, t…
View article: Design and Characterization of Light Field and Holographic Near-Eye Displays
Design and Characterization of Light Field and Holographic Near-Eye Displays Open
The light field and holographic displays constitute two important categories of advanced three-dimensional displays that are aimed at delivering all physiological depth cues of the human visual system, such as stereo cues, motion parallax,…
View article: Fast and Accurate Depth Estimation From Sparse Light Fields
Fast and Accurate Depth Estimation From Sparse Light Fields Open
We present a fast and accurate method for dense depth reconstruction from sparsely sampled light fields obtained using a synchronized camera array. In our method, the source images are over-segmented into non-overlapping compact superpixel…
View article: Depth Resolution of 3D Imaging Techniques for Target Detection in Mobile Work Machines
Depth Resolution of 3D Imaging Techniques for Target Detection in Mobile Work Machines Open
3D imaging is important for enabling autonomous operation of smart mobile work machines. Different sensing techniques have different characteristics, which affect the choice of sensors for each application. We study the depth resolution of…
View article: Photogrammetric Multi-Camera Calibration Using An Industrial Programmable Robotic Arm
Photogrammetric Multi-Camera Calibration Using An Industrial Programmable Robotic Arm Open
<p>Calibration of multiple cameras is a critical step in most vision enhancement systems. Target-based calibration approaches are known to provide accurate and stable results. However, they require manually performed capture procedur…
View article: Methods for Simultaneous Robot-World-Hand–Eye Calibration: A Comparative Study
Methods for Simultaneous Robot-World-Hand–Eye Calibration: A Comparative Study Open
In this paper, we propose two novel methods for robot-world-hand–eye calibration and provide a comparative analysis against six state-of-the-art methods. We examine the calibration problem from two alternative geometrical interpretations, …
View article: Methods for Simultaneous Robot-World Hand-Eye Calibration: A Comparative Study
Methods for Simultaneous Robot-World Hand-Eye Calibration: A Comparative Study Open
In this paper, we propose two novel methods for robot-world/hand-eye calibration and provide a comparative analysis against six state-of-the-art methods. We examine the calibration problem from two alternative geometrical interpretations, …
View article: Speckle reduction method for image-based coherent stereogram generation
Speckle reduction method for image-based coherent stereogram generation Open
We propose a speckle noise reduction method for generation of coherent holographic stereograms. The method employs densely sampled light field (DSLF) of the scene together with depth information acquired for each ray in the captured DSLF. …