42 Result(s)
within
Chapter
Ryo Furukawa
English
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Chapter and Conference Paper
AutoEnhancer: Transformer on U-Net Architecture Search for Underwater Image Enhancement
Deep neural architecture plays an important role in underwater image enhancement in recent years. Although most approaches have successfully introduced different structures (e.g., U-Net, generative adversarial...
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Chapter
Unexpected Pitfalls of Bitcoin
The Bitcoin blockchain achieves a strong tamper resistance by exploiting cryptographic technologies.
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Chapter and Conference Paper
GCN-Calculated Graph-Feature Embedding for 3D Endoscopic System Based on Active Stereo
One of the promising fields for active-stereo sensors is medical applications such as 3D endoscope systems. For such systems, robust correspondence estimation between the detected patterns and the projected pa...
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Chapter and Conference Paper
Dense Pixel-Wise Micro-motion Estimation of Object Surface by Using Low Dimensional Embedding of Laser Speckle Pattern
This paper proposes a method of estimating micro-motion of an object at each pixel that is too small to detect under a common setup of camera and illumination. The method introduces an active-lighting approach...
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Chapter
Light Source
To build an active-lighting system, selection and configuration of light sources are crucial. In this chapter, we categorize existing light sources based on several criteria and explain the principles and mech...
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Chapter
Robot Vision, Autonomous Vehicles, and Human Robot Interaction
Sensors are indispensable to robots. Active-lighting sensors, for example, work in a robust manner, even under severe conditions. They are utilized heavily for various robot tasks, such as object localization/...
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Chapter
Geometry
A common objective for using active-lighting techniques is to measure 3D geometric properties (e.g., shapes, positions, normals) of real scenes. Thus, 3D geometrical modeling of 3D scenes and measurement devic...
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Chapter
Structured Light
The structured light method is a very popular way to find correspondences between coordinates of a camera image and those of a projector image. This method class uses spatial or temporal image patterns as clue...
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Chapter
Photometric Estimation
Previous chapters considered methods of estimating geometric shape information by using active-lighting methods, which provide photometric characteristics of the target scene and light sources. Because depen...
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Chapter
E-Heritage
is a valuable asset left to us by our ancestors. Unfortunately, cultural heritage is routinely lost via natural disasters (e.g., earthquakes and tsunami) and man-made disasters (e.g., arson and mischief). Phy...
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Chapter
Photometry
Active-lighting sensors project light onto target objects or the scenes to obtain photometric measurements of the reflected light, including travel time and return angle. Therefore, understanding these sensor ...
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Chapter
Sensor
To retrieve light and reflectance information from the real world, a wide variety of sensors have been developed for specific purposes. Among them, the RGB camera, which is the most similar to the human eye, i...
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Chapter
Photometric Stereo
Shading on a surface provides strong cues for us to perceive the 3D shape of an object. The study of computationally inferring a 3D shape from shading cues originated with shape from shading (Horn in Shape from s...
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Chapter
Other Shape Reconstruction Techniques
In the previous chapters, the photometric stereo and structured light methods were introduced. Although these two methods have been well studied in the computer vision field, other optical phenomena are used t...
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Chapter
Biomedical Application
For medical diagnoses and treatments, basic and clear information, including heart rate, blood pressure, X-ray imagery, etc., of a subject is essential. Thus, a huge amount of sensing technologies have been re...
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Chapter
Visualization/AR/VR/MR Systems
As is shown in previous chapters, active lighting is a powerful tool that satisfies various demands. Succeeding chapters provide several application examples of active lighting. Projecting active-lighting imag...
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Chapter and Conference Paper
Robust Structured Light System Against Subsurface Scattering Effects Achieved by CNN-Based Pattern Detection and Decoding Algorithm
To reconstruct 3D shapes of real objects, a structured-light technique has been commonly used especially for practical purposes, such as inspection, industrial modeling, medical diagnosis, etc., because of sim...
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Chapter and Conference Paper
Wide-Area Shape Reconstruction by 3D Endoscopic System Based on CNN Decoding, Shape Registration and Fusion
For effective in situ endoscopic diagnosis and treatment, dense and large areal shape reconstruction is important. For this purpose, we develop 3D endoscopic systems based on active stereo, which projects a grid ...
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Chapter and Conference Paper
Auto-calibration Method for Active 3D Endoscope System Using Silhouette of Pattern Projector
In this paper, we develop an active stereo system for endoscope which requires auto-calibration, because a micro pattern projector is inserted through the instrument channel during an operation and cannot be f...
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Chapter and Conference Paper
3D Endoscope System Using Asynchronously Blinking Grid Pattern Projection for HDR Image Synthesis
3D endoscopic systems have been researched and developed to measure the actual shape and size of living tissues for the purpose of remote surgery and diagnosis, to name a few. For such systems, active stereo t...
