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Bm and A1Bm phenotypes are the most frequent ABO variants in the Japanese population. The B antigen on Bm red blood cells is only detectable by adsorption and elution tests, and plasma B‐transferase activity is usually detected at half or less levels compared with that of common B. Recently, a B allele lacking an erythroid cell‐specific transcription enhancer in intron 1 of the ABO gene was identified...
This paper proposes a method for estimating extrinsic camera parameters using video images and position data acquired by GPS. In conventional methods, the accuracy of the estimated camera position largely depends on the accuracy of GPS positioning data because they assume that GPS position error is very small or normally distributed. However, the actual error of GPS positioning easily grows to the...
Hyperspectral imaging sensors suffer from spectral and spatial misregistrations. These artifacts prevent the accurate acquisition of the spectra and thus reduce classification accuracy. The main objective of this work is to detect and correct spectral and spatial misregistrations of hyperspectral images. The Hyperion visible near-infrared (VNIR) subsystem is used as an example. An image registration...
Accuracy of digital elevation model (DEM) obtained by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) that has along-track stereovision is investigated. The pointing offset and stability of the radiometer is one cause of the geometric deviation of the ASTER DEM attached with orthorectified image. The correction methodology to be implemented to the data processing is suggested...
Surface completion is a technique for filling missing regions in 3D models measured by range scanners and videos. Conventionally, although missing regions were filled with the similar shape in a model, the completion process was fairly inefficient because the whole region in the model was searched for the similar shape. In this paper, the completion is efficiently performed using principal curvatures...
In annotation overlay applications using augmented reality (AR), view management is widely used for improving readability and intelligibility of the annotations. In order to recognize the visible portions of objects in the user's view, the positions, orientations, and shapes of the objects should be known in the case of conventional view management methods. However, it is difficult for a wearable...
This paper presents a telepresence system for a ride, such as on a roller coaster, using a motion platform that can provide a seated user with the sensation of inertial force. Most conventional studies using a motion platform with a few degrees of freedom have not generated an inertial force when a ride accelerates, because a motion platform cannot simulate the same motion of a real roller coaster...
In the field of computer vision, many kinds of camera parameter estimation methods have been proposed. As one of these methods, an extrinsic camera parameter estimation method that uses pre-constructed feature landmark database has been studied. In this method, extrinsic camera parameters of video images are estimated from correspondences between landmarks and image features. Although this method...
3D mesh models generated with range scanner or video images often have holes due to many occlusions by other objects and the object itself. This paper proposes a novel method to fill the missing parts in the incomplete models. The missing parts are filled by minimizing the energy function, which is defined based on similarity of local shape between the missing region and the rest of the object. The...
This paper describes photometric registration for augmented reality (AR) using a high-dynamic-range (HDR) image. In photorealistic AR, estimating the lighting environment of virtual objects is difficult because of low dynamic range cameras. In order to overcome this problem, we propose a method that estimates the lighting environment from an HDR image and renders virtual objects using an HDR environment...
Several human navigation services are currently available on the cellular phones that uses embedded GPS and 2-D map. However, 2-D map based human navigation is not always easy to understand for users because that is not intuitive. In order to realize more intuitive human navigation, AR (augmented reality) based navigation where guiding information is overlaid in the real image is expected to be the...
This paper describes a real-time pre-visualization method using augmented reality techniques for videographers. It enables them to test camera work without real actors in a real environment. As a substitute for real actors, virtual ones are superimposed on a live video in real-time according to a real camera motion and an illumination condition. The key technique of this method is real-time motion...
This paper proposes an accurate geometric registration method by estimating blur effects from a degraded image with image markers for augmented reality. A small and inexpensive camera used in augmented reality systems sometimes captures degraded images because its focus and/or iris are fixed. This degradation of a captured image affects the accuracy of the detected positions of feature points in the...
This paper proposes a novel method for estimating depth without similarity measures such as SSD and NCC. Our idea for estimating a depth map is very simple; only counting interest points in images is integrated with the framework of multi-baseline stereo. Even by a simple algorithm, depth can be determined without computing similarity measures such as SSD and NCC that have been used for conventional...
This paper describes a method for constructing feature landmark database using omnidirectional videos and GPS positions acquired in outdoor environments. The feature landmark database is used to estimate camera positions and postures for various applications such as augmented reality systems and self-localization of robots and automobiles. We have already proposed a camera position and posture estimation...
This paper investigates the problem of object surface reflectance modeling, which is sometimes referred to as inverse reflectometry, for photorealistic rendering and effective multimedia applications. A number of methods have been developed for estimating object surface reflectance properties in order to render real objects under arbitrary illumination conditions. However, it is still difficult to...
Recently, the concept of behavioral media using a mobile robot has emerged in tele-robotics, where the mobile robot behaves as a user's second body or an agent in a remote site. An important issue in behavioral media is how to control the robot intuitively immersing a user into a remote site. This paper describes a new approach which combines locomotion interface and immersive projection display of...
Photometric registration is as important as geometric registration to generate a seamless augmented reality scene. Especially the difference in image quality between a real image and virtual objects caused by defocusing and motion blurring in capturing a real scene image easily exhibits the seam between real and virtual worlds. To avoid this problem in video see-through augmented reality, it is necessary...
This paper describes a localization method with wearable electromagnetic sensor and orientation sensor for wearable computer users. Many user localization methods have been investigated to realize location-based services in a wide environment. The localization methods usually employ a hybrid approach in which user's position is estimated by using positioning infrastructures and dead reckoning such...
This paper proposes a method for reconstructing a 3D scene structure by using the images reflected in a spherical mirror. In our method, the mirror is moved freely within the field of view of a camera in order to observe a surrounding scene virtually from multiple viewpoints. The observation scheme, therefore, allows us to obtain the wide-angle multi-viewpoint images of a wide area. In addition, the...
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