In the mobile reception of OFDM, reception characteristics are degraded by ICI(inter-Carrier Interference). In ISDB-T, convolutional code and Reed-Solomon code as error-correcting codes are used. In this paper, decoding and encoding of the error-collecting code are operated in the iterative detection. As the results, it is possible to improve the characteristics.
We have been developing a 4K video quality evaluation equipment which compares a test (encoded) video to a reference video in real time. Our system calculates an objective quality score (DSCQS: Double Stimulus Continuous Quality Scale) frame by frame considering the characteristics of the human eye.
We have developed multiplexing and encoding technologies of multimedia services for 8K Super Hi-Vision
satellite broadcasting. We describe a “General Data Transport Method” over MMT which realizes frequent data updating by
push over broadcasting and prototype receiver installed under the method.
We have proposed
to receive content in
device function and user situation
This paper describes the method
delivered by differ
. It is
that the method is effective
We propose a method of photographs selection and layout for a photo album.Good photographs are selected using
the expression of a smile in the photograph and the composition of the photograph.Photographs in the album are arranged order
of flow of time.
We propose a color correction method for underwater images. We use an exposure bracketing imaging for
capturing appropriate color information of underwater scenes where red-components are poor. Using the obtained multi-exposed
images, we correct color of underwater images via a multi-illuminant estimation. Experimental results show the effectiveness of
We previously reported the image sensor communication system which transmits information
from a liquid crystal display (LCD) to a camera-equipped mobile device. In this system, two-dimensional
Orthogonal Frequency Division Multiplexing (OFDM) with Quadrature Phase Shift Keying (QPSK) is used
to generate information embedded images shown on the display. In this paper, usage of pilot signals is
investigated for the purpose of improving reliability of the system.
We propose a method for estimating reflectance spectra from tristimulus values by minimizing the squared
error between the original tristimulus values and their estimated ones. The proposed least squares problem has an analytic
solution. Experimental results show that the estimated reflectance spectra reproduce the original tristimulus values well.
Autonomous robots are becoming widespread and expanding their applications. For such robots, it's necessary to understand the shape of surrounding objects and the position of obstacles precisely by range sensors such as 3D Vision Sensor. When measuring distance by 3D Vision Sensor, the problem is the measurement error caused by secondary reflection light and transmitted light. We studied a method for suppressing measurement error by using additional projection patterns with thin bright bars.
An 8K 120 Hz image capturing experiment using a 133-Mpixel 60 Hz CMOS image sensor is described. To
acquire an 8K 120 Hz image, 2:1 inter-line scanning and interpolation technique with adaptive noise reduction were adapted.
Experimental results show the motion blur was improved and the resolution in the motionless area maintained compared with that
of the conventional 60 Hz scanning. The signal-to-noise ratio was improved 4.4 dB by the adaptive noise reduction technique.
In this paper we develop a prototype of a spherical audiovisual sensor. While the surrounding field of view is
observed by a spherical camera consisting of a pair of fisheye cameras, the 3D distance of the surrounding
space is coarsely
acquired by 20 ultrasonic sensors distributed on the surface of a regular icosahedron.
In this study, we propose a spectral computed tomography (CT) with reduced data traffic. Energy spectra taken
from selected pixels were combined with
conventional CT image to allow material identification
, while reducing data traffic.
pectral CT image obtained by
first generation CT
is being presented to verify our concept.
We implemented an IoT sensor for evaluating comfortability of real estate. The IoT sensor can measure temperature, humidity, illuminance, smell and acceleration, and record sound and video. From the experiment in which we set one sensor in northern and southern rooms respectively, we succeeded in visualizing that the room temperatures were very different even in the same building. From the outdoor experiment, we could measure how the vibration and noise were detected in each place.
Hilbert transform is required for Optical SSB (OSSB) modulation. We propose OSSB modulation using overlap Hilbert
transform on frequency domain. We confirmed continuous transformed waveform and improved sideband suppression in OSSB spectrum.
In this p
PLC under the impulsive noise environment is discussed
In the compensation of
it is necessary to estimate the channel
By computer simulation
scheme using scattered
pilot symbols under
BCH code and LDPC code are proposed for
mobile reception of OFDM signal, reception characteristics
In this paper, the reception
characteristics of dual
polarized MIMO ultra
error correcting code
under mobile reception are evaluate
The compensation scheme for the interference that is caused by the delayed wave over Guard Interval is proposed.
The proposed scheme is contracted by removing ISI component and extending artificial Guard Interval. In the results of computer
simulations, it is possible to improve reception characteristics by the proposed scheme.
We have studied the underwater
video transmission system for
from the submarine to the
on the sea via
the optical repeater.
This report describes a met
od to know the
of the submarine from the ship
with a laser
rangefinder on the optical receiver module.
We propose an optical transmission system for realizing TV live broadcasting from a submarine to a ship via a
repeater that has receiver modules on its spherical surface. We made a small and stable optical module that can track incident
light with wide range , and can send the submarine voice message，too.
A novel sampling strategy suitable for compressed sensing MRI (CS-MRI) is proposed. Spatial resolution of
reconstructed images is sometimes reduced due to variable density random undersampling. To improve spatial resolution in CSMRI,
oblique scanning in k-space for the read-out direction is adopted to acquire a higher spatial frequency for the phaseencoding
direction. Reconstruction experiments showed that spatial resolution can be improved without lengthening scan time.
ses a method to decide
the appropriate region
for estimating illumination light
from one image
Method of image segmentation adopts Ridge based Distribution Analysis
which is not affected by distribution of shade.
This paper proposes a measurement method of changes
of body temperature by tracking the person in thermal
images. We try to estimate more accurate changes of body temperature by
considering the influence of room
Digitized picture doesn't have texture information such as the luster. Therefore its visual appearance can't be
changed. This study proposes a method of viewpoint estimation by video image and acceleration sensor for representing texture
of big picture, and tries to represent texture.
high S/N image
imental results show
dynamic rage images
is also presented
HEVC Intra Coding requires considerable calculation. In this paper, we propose a method that accelerates Intra
coding processing by using deep learning. We have attempted to make the network models for each size of PU.
The CT images
counting type X
ray CT ha
been studied on
image quality. Compared to current
type of detector
can yield clearer CT image under low
dose. In this report, CT image
in association with the fluctuation of energy spectra
Fluorescent sensing has become widespread in healthcare or biochemistry.
, for sensing analytes labeled
fluorochromes, conventional methods require to repeat sensing them by switchi
ng optical filters. In this report, we
propose a method that can be used for simultaneously sensing
fluorochromes with multi
bandpass filters and image processing.
ray detector used for CT, material identification is not possible in widely used current mode image sensor.
To do mate
rial identification using current mode image sensor, we report a signal detection method depending on the energy of
rays with the interaction of X
ray and substance.
A flicker-free driving method at a 120-Hz frame frequency by using interlaced scanning and an electrical
shutter is proposed. This method suppresses flicker in video, which is captured at a 120-Hz frame frequency and at a
100-Hz illumination-intensity variation frequency.
In this paper, we compare four typical recommendation algorithms aiming at online lecture recommendation: collaborative filtering, matrix factorization, tf-idf, and word2vec. The experimental results using 1,958 videos in Schoo showed that the matrix factorization is the best (precision was 0.28@10), followed by collaborative filtering. On the other hand, content-based filtering did not work well for lecture recommendation.
We propose a method of extracting TV program themes. Our approach detects burst words from TV programs
and analyzes the time-series correlation between all pairs of them. In addition, we have developed a system for visualizing the
appearance frequency of the keywords on the time axis for investigating the themes.
We present visual information with auditory cues to provide enough pseudo-haptic feedback when a user grasps a virtual object with a bare hand. We examine effects of the auditory cues on perception of grasping a virtual object with a bare hand.
Online dating is a popular way to search for a partner for marriage. Based on data from dating website, we propose
an approach to evaluate people’s objective attractiveness. We predict people’s attractiveness by SVR, based on people’s profiles.
The experimental results have shown high correlations between our predicted attractiveness scores and their real values.
various computer vision application
are used as inter
mediate representation. Especially in object
recognition, attributes are defined as components of object, e.g.
Thus localized information in image is effective to
. In this paper, we evaluated the
in training attributes.
In the past, the diffuse reflection component has often been assumed to be Lambertian in many studies of
photometric and multi-view stereo, which aim to extract 3D information from images. We propose a method to correct
intensities of non-Lambertian images for directly using the existing stereo reconstruction methods. Our method obtains
Lambertian images by estimating the incident angles relative to the surface normals from a single image.
In this paper, we propose a method for simultaneously recovering the surface normals, the diffuse reflectance
parameters associated with the simplified Oren-Nayar-Wolff model, and the illumination conditions from multiple images
captured under different light dirrections.
We propose a method to estimate a position of a light source by using a single RGB-D image. First, highlights on
scene object surfaces are detected by using depth information and luminance histograms. Next, light vectors (incident angles)
are computed from normal vectors of the detected highlights and viewing vectors. Finally, the intersection of light vectors is
calculated for estimating a three-dimensional position of the light source.
In this paper, we propose a novel object tracking method to avoid tracking failures. The proposed method is
based on probabilistic state estimation, and uses Kernelized Correlation Filter (KCF) for evaluating a likelihood. The
experimental result shows that the proposed method achieves the superior performance to state-of-the-art methods.
In this paper, w
developing imaging techni
que for handing down
and skills in
propose the method that
temporally establishes correspondences between two different videos including common
manufacturing works by integrating object and motion features
mapping has been attracting attention as a method of editing appearance of objects by using
It is difficult for us to find the placement of multiple projectors which achieve
positional relationship between
greatly affects the quality of
, we propose a method to find
optimal placement of
multiple projectors for
, for finding the effective candidates of projector’s direction.