Kohei Aarai

Kohei Aarai
Saga University

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89
Publications
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Introduction
Skills and Expertise

Publications

Publications (89)
Chapter
A challenge in multi-dimensional Web GIS over networks is inconsistency in animated display images due to differences in time intervals that occur when displaying images as a result of different spatiotemporal searches. A method to adjust and display the inconsistency is proposed. Through a simulation, one of the characteristic functions of GIS is...
Chapter
Prediction of isoflavone content in soybeans with Sentinel-2 of optical sensor data by means of regressive analysis is conducted. There is strong demand on estimation of isoflavone content for soybeans famers because the isoflavone is good for health. Soy isoflavones are a component that is abundant in the germ of soybeans. Soy isoflavones have a s...
Chapter
Circle feature extraction method from remote sensing satellite images based on polar coordinate representation of Wavelets is proposed. The conventional two dimensional wavelet transformation is not effective to extract arc and circle features form the imagery data. In order to enhance the capability in an effective manner, a polar coordinates of r...
Chapter
Sport vision based tennis player training is proposed to accelerate players’ skill-up in tennis play with instructions provided by the proposed sport vision based system. In sports, gaze, dynamic visual acuity, eye movement and viewing place are important. In sports vision, Static eyesight, Dynamic visual acuity, Contrast sensitivity, Eye movement,...
Chapter
Effectiveness of Noise Equivalent delta Temperature (NEdT) and Band 10 (8.3 μm) of Advanced Spaceborne Thermal Emission and Reflection Radiometer/Thermal Infrared Radiometer (ASTER/TIR) on SST Estimation is confirmed with MODerate resolution atmospheric TRANsmission (MODTRAN). Also, Skin Sea Surface Temperature (SSSST) estimation accuracy of ASTER/...
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A comparative study on cloud parameter estimation among GOSAT/CAI, MODIS, CALIPSO/CALIOP and Landsat-8/OLI is carried out using Laser Radar: Lidar as a truth data. Optical depth, size distribution, as well as cirrus type of clouds are cloud parameters. In particular, cirrus cloud detection is tough issue. 1.38 µm channel is required for its detecti...
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Head movement has been found to be a natural way of interaction. It can be used as an alternative control method and provides accessibility for users when used in human computer interface solutions. The combination of Head-mounted displays (HMDs) with mobile devices, provide an innovation of new low cost of human-computer interaction. Such devices...
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In this paper, a new content-based image retrieval technique using shape feature is proposed. A shape features extracted by layered structure representation has been implemented. The approach is extract feature shape by measuring the distance between centroid (center) and boundaries of the object that can capture multiple boundaries in the same ang...
Conference Paper
This paper presents the evaluation of traffic agent utilization to identify road traffic flow density. This research also proposes the concept of traffic agent as the new method for traffic monitoring and surveillance.
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Methods for wild pig identifications and discrimination of female wild pigs based on feature matching methods with acquired Near Infrared: NIR moving pictures are proposed. Trials and errors are repeated for identifying wild pigs and for discrimination of female wild pigs through experiments. As a conclusion, feature matching methods with the targe...
Article
Computer input by human eyes only is proposed for disabled and elderly persons, in particular, together with its applications to communication aid, having meal aid, information collection aid, watching TV aid, listening to radio aid, phoning aid, Electric Wheel Chair: EWC control, service robot control. Through experiments with disabled and normal...
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This research is focusing on ornamental leaf with dual functionalities, which are ornamental and medicinal functionalities. However, only few people know about the medicinal functionality of this plant. In Indonesia, this plant is also easy to find because mostly cultivates in front of the house. If its medicinal function and that easiness are take...
Conference Paper
Rescue system with vital sign, location and attitude monitoring together with traffic condition, readiness of helper in particular for disabled and elderly persons is proposed. All the sensors which allows monitoring blood pressure, body temperature, pulse rate, measuring sensor for the number of steps, calorie consumption, EEG, EMG, GPS receiver,...
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Numerical deviation based optimization method for estimation of total column CO2 measured with ground based Fourier Transformation Spectormeter: FTS data is proposed. Through experiments with aircraft based sample return data and the ground based FTS data, it is found that the proposed method is superior to the conventional method of Levenberg Marq...
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Human has a duty to preserve the nature, preserving the plant is one of the examples. This research emphasis on ornamental plant that has functionality not only as ornament plant but also as a medicinal plant. Purpose of this research is to find the best of the particular feature extraction components from several wavelet transformations. It consis...
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Speed and vibration performance as well as obstacle avoidance performance of the previously proposed Electric Wheel Chair: EWC controlled by human eyes only is conducted. Experimental results show acceptable performances of speed vibration performance as well as obstacle avoidance performance for disabled persons. More importantly, disabled persons...
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Rescue system for disabled and elderly person is proposed together with method and system for frequent health monitoring as vital signs with psychological status monitoring for search and rescue of handicapped person is proposed. Heart beat pulse rate, body temperature, blood pressure, blesses and consciousness is well known vital signs. In particu...
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The obstacle avoidance is currently treated by methods that fall into two broad categories: global and local approach. This paper considers the obstacles whose velocity and direction cannot be easily predicted. Such obstacle is called transient obstacle. To avoid such kind of obstacle, we introduce a local path planning method for a robotics by usi...
Conference Paper
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Manga comic for mobile devices is chalenging because of the limitation of device's screen size and time consuming of the process. In this paper, we proposed an efficient method for automatically creating mobile content of digital Manga comic from scanned of printed digital comic by extracting comic frame, comic balloon and Japanese character within...
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Hu man has a duty to preserve the nature, preserving the plant is one of the examp les. This research has an emphasis on ornamental plant that has functionality not only as ornament but also as medicine. Although in Indonesia, in general this plant is cultivated in front of the house; only few people know about its med icinal function. Considering...
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Feature extraction for gait recognition has been created widely. The ancestor for this task is divided into two parts, model based and free-model based. Model-based approaches obtain a set of static or dynamic skeleton parameters via modeling or tracking body components such as limbs, legs, arms and thighs. Model-free approaches focus on shapes of...
Conference Paper
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Human gait walking skeleton model is proposed together with its implementation for gender classifications. The proposed model is based on morphological operations and is similar to the conventional skeleton model which allows calculations of joint angles of human body. Also gender classification method based on the proposed human gait walking skele...
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The main problem that corresponding with breast cancer is how to deal with small calcification part inside the breast called microcalcification (MC). A breast screening examination called mammogram is provided as preventive way. Mammogram image with a considerable amount of MC or called clustered MC has been a problem for the doctor and the radiolo...
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Method for psychological status estimation by gaze location monitoring using Eye-Based Human-Computer Interaction: EBHCI is proposed. Through the experiment with English book reading of e-learning content, relation between psychological status and the distance between the correct location of English sentence reading points and the corresponding loc...
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Eye-based domestic helper is proposed for helping patient self-sufficient in hospital circumstance. This kind of system will benefit for those patient who cannot move around, it especially happen to stroke patient who in the daily they just lay on the bed. They could not move around due to the body malfunction. The only information that still could...
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Sensitivity analysis of Fourier TransformationSpectrometer: FTS against observation noise on retrievals of carbon dioxide and methane is conducted. Through experimentswith real observed data and additive noise, it is found that the allowable noise on FTS observation data is less than 2.1x10-5if estimation accuracy of total column carbon dioxide and...
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Simulation method of sea water which contains spherical and non-spherical particles of suspended solid and phytoplankton based on Monte Carlo Ray Tracing: MCRT is proposed for identifying non-spherical species of phytoplankton. From the simulation results, it is found that the proposed MCRT model is validated. Also some possibility of identificatio...
Conference Paper
An attempt is made for improvement of secret image invisibility in circulation images with dyadic wavelet based data hiding with run-length coded secret images of which location of codes are determined by random number. Through experiments, it is confirmed that secret images are almost invisible in circulation images. Also robustness of the propose...
Conference Paper
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Human Gait: HG recognition method based on wavelet transformation is proposed. Using Chinese Academy of Sciences (CASIA), the proposed method is evaluated and is compared to the conventional HG recognition method without utilizing wavelet transformation. In particular, two preprocessing methods, model based and model free methods are attempted for...
Article
Domestic robot with voice communication aid which is controlled by human eyes only is proposed for disabled and elderly persons. It allows taking a look the surroundings of the domestic robot using cameras mounted on the domestic robot. It also allows enjoying conversations with the surrounding peoples of the domestic robot using voice output capab...
Article
Breast cancer is the most frightening cancer for women in the world. The current problem that closely related with this issue is how to deal with small calcification part inside the breast called micro calcification (MC). As a preventive way, a breast screening examination called mammogram is provided. Mammogram image with a considerable amount of...
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Full-text available
System for evacuation information server and rescue system with wearable health monitoring sensor network is proposed. Experiments are conducted with the developed system through comparison between health monitored data and psychological / physical tiredness. Experimental results show relations between the monitored health conditions and psychologi...
Conference Paper
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Eye-based Human Computer Interaction (HCI) with full specification of mouse and keyboard by human eyes only is proposed for, in particular, disabled person and for input device of wearable computing. It utilizes pupil knowledge in gaze estimation process. Existing conventional eye-mouse, gaze-mouse does not robust against various types of users wit...
Conference Paper
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Blink detection is used for a variety of applications such as Human-Computer Interaction, wearable computing, etc. Blink detection method with Gabor filter is proposed to realize high accurate blink detection. The blink detection accuracy is evaluated by several people and compare to the other existing conventional methods. Through the comparison,...
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The numbers of persons who are paralyzed dependent on others due to loss of self-mobility is growing as the population ages. We have developed a wheelchair pro-totype exclusively controlled by eye and able to be used different users while proving robust against vibration, illumination change, and user movement. The keys to this flexibility are the...
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Trend analysis of Terra/ASTER/VNIR calibration data is made for finding possible causes for degradation of radiometric calibration coefficients. Two sets of photometers are equipped at just after the onboard calibration lamp and at just in front of optics entrance of the mission instrument, VNIR. Unfortunately, the later was malfunctioned 300 days...
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A sensitivity analysis is performed to investigate potential improvements to the accuracy of air temperature profile retrievals near the tropopause. A simple inversion method is employed to identify and remove redundant spectral channels from the retrievals using simulated data for the high-spectral resolution sounder AIRS (Atmospheric Infrared Sou...
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A method for reconstruction of cross-section of rainfall situations with precipitation radar data based on wavelet analysis of multi-resolution analysis (MRA) which allows extract a peak of the radar reflectivity is proposed in order to detect bright band height. It is found that the bright band height can be estimated by using the MRA with the bas...
Article
A method for estimation of sea surface temperature, ocean wind speed and water vapor with microwave radiometer data based on simulated annealing is proposed. The proposed method shows about 60% improvement of sea surface temperature estimation accuracy in comparison to the existing method using Newton’s iterative algorithm.
Conference Paper
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Clustering is commonly used for static data. After gathering data, clustering can be done to organize data into groups whose members are similar in some way. This kind of clustering may not be used for stream data which comes unpredictably. On-line clustering is a kind of clustering for dynamic data. In this paper we proposed an approach for on-lin...
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The sea surface wind speed (SSWS) derived by a microwave radiometer can be contaminated by changes of the brightness temperature owing to the angle between the sensor azimuth and the wind direction (Relative Wind Direction effect: RWD effect). We attempt to apply the method proposed by Konda and Shibata (2004) to the SSWS derived by Advanced Microw...
Article
Radiometric performance of the Advanced Spectrometer for Thermal Emission and Reflection Radiometer (ASTER) is characterized by using acquired imagery data. Noise-equivalent reflectance and temperature, sensitivity (gain), bias (offset), and modulation transfer function (MTF) are determined for the visible and near-infrared (VNIR), the shortwave in...
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This paper proposes a new approach to accelerate a construction of automatic clusters. It initiates an analyse of the moving variance of clusters for each stage of cluster construction, then observes the pattern to find the global optimum as well as avoid the local optima. Using two constraints, valley- tracing and hill-climbing, to find the global...
Conference Paper
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This paper proposed a new approach to find the global optimum of clustering. It analyzes the moving variance of clusters for each stage of cluster construction, then observes the pattern to find the global optimum as well as avoid the local optima. It introduces two constraints, valley-tracing and hill- climbing, to find the global optimum. Besides...
Conference Paper
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A new method which allows to identify any shape of cluster patterns in case of numerical clustering is proposed. The method is based on the iterative clustering construction utilizing a nearest neighbor distance between clusters to merge. The method differs from other techniques of which the cluster density is determined based on calculating the va...
Conference Paper
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This paper proposed new approach to make cluster construction automatically for normal data set. The proposed method for automatic cluster construction is based on identifying moving variance of cluster for each stage of cluster construction, then analyzing the pattern to find the global optimum. After that, this paper proposed a new formulation to...
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A joint campaign was held at Lunar Lake Playa, Nevada (USA) in June 1996 to evaluate the accuracy of reflectance-based, vicarious calibrations of Earth Observing Systems (EOS). Four groups participated in the campaign and made independent measurements of surface reflectance and atmospheric transmittance on five different days. Each group predicted...
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Radiometric calibration and algorithm validation play a vital role in the success of NASA's Earth Science Enterprise in general and the success of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER that is on the Terra platform. In order to ensure that the data from ASTER are of high quality, it is necessary to validate the r...
Article
A method for vicarious calibration of a solar reflectance radiometer through an estimation of reflectance of the test site with a high spatial-resolution radiometer onboard the same platform is proposed. Here we treat the case of the vicarious cross-calibration of ADEOS/OCTS (Advanced Earth Observing Satellite/Ocean Color and Temperature Scanner) w...
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In order to validate wind vectors derived from the NASA Scatterometer (NSCAT), two NSCAT wind products of different spatial resolutions are compared with observations by buoys and research vessels in the seas around Japan. In general, the NSCAT winds agree well with the wind data from the buoys and vessels. It is shown that the root-mean-square (rm...
Article
A comparison of the field campaign data, acquired at the test site in Tsukuba, Japan on 13 and 14 December, by the participated institutes is made for the assessment of the vicarious calibration for EOS-AM1/ASTER instrument to be launched in 1999. Solar irradiance, target spectral reflectance, etc. are acquired and compared together with calculated...
Article
Inverse problem solving methods are applicable to the image analysis and classification. This paper will review the widely used inversion problem solving methods together with a couple of examples for image analysis and classification methods with inversion.
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Describes the preflight and inflight calibration approaches used for the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). The system is a multispectral, high-spatial resolution sensor on the Earth Observing System's EOS-AM1 platform. Preflight calibration of ASTER uses well-characterized sources to provide calibration and pre...
Article
Interactive calibration method for mission instruments onboard same platform is proposed together with some examples and accuracy assessments and evaluations. A couple of examples of interactive calibration among ADEOS/AVNIR, OCTS and POLDER and between EOS-AM1/ASTER and MODIS are shown with a result of the calibration accuracy assessment. The resu...
Article
A method for interactive calibration of the sensors onboard the same platform was poposed together with an example of the calibration of the EOS-AM1 (Earth Observation Systems-AM1)/ASTER(Advanced Spaceborne Thermal Emission and Reflection Radiometer) — TIR(Thermal Infrared Raiometer) with EOS-AM1/MOIS (Moderate Resolution of Imaging Spectrometer)....
Article
Methods for ice concentration estimation with passive microwave instrument data by means of inversion techniques are proposed. The experimental results with MOS-1 (Marine Observation Satellite - 1)/MSR(Microwave Scanning Radiometer) data and MOS-1/VTIR(Visible and Thermal Infrared Radiometer) data as a truth of ice concentration, show that approxim...
Article
Preflight and in-flight radiometric calibration plans are described for the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) that is a multispectral optical imager of high spatial resolution. It is designed for the remote sensing from orbit of land surfaces and clouds, and is expected to be launched in 1998 on NASA's EOS AM-1...
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A microwave scanning radiometer is the powerful equipment for obtaining precise data of microwave-radiation however the spatial resolution is larger than many of the objects of interest within the image. If the exact antenna directional pattern and the orbit of the satellite can be known, the image reconstruction can be done exactly. Actually, it i...
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The comparison between two kinds of sea surface temperature estimation methods for multispectral (over 2 channels) TIR data are made. The first one is the conventional split window method and the second one is the newly proposed physical based method. The comparison is based on the simulated spaceborne TIMS data, three kinds of the channel selectio...
Article
To estimate the earth surface temperature and emissivity from the satellite detected non-atmospherically corrected thermal IR data, an iterative estimation method is proposed. At first, the radiative transfer equation which describes the transfer process of the radiation from the surface to the satellite is simplified into the non-linear equation....
Conference Paper
A new method for SAR image classification is proposed. The method is based on maximum likelihood decision rule with texture features and takes into account the probability density function of texture features. The experimental results show the proposed method is superior to the existing maximum likelihood method with multivariate normal distributio...
Conference Paper
The APC is the powerful technique for obtaining a precise data of microwave-radiation, though the pattern correction is much more sensitive to the footprint changes and additive noise. It is necessary to reduce the instability that is called `ill-posed problem in inverse problem', therefore an iterative algorithm for APC based on the Projection Ont...
Article
A study of the estimation of partial cloud cover within a pixel has been conducted in order to be able to use pixels partially contaminated with cloud in sea surface temperature determination.The existing estimation methods based on the least squares method with constraints of minimizing the mixing ratio and observation vector, are theoretically co...
Conference Paper
A basic concept for an interactive calibration between EOS-AM1/ASTER and MODIS is proposed together with the method for assessment of interactive calibration accuracy. The results from preliminary assessment on atmospheric transparency differences between two wavelength regions of ASTER/TIR and MODIS by using LOWTRAN-7 show the possibility of the p...
Conference Paper
A comparative study on interpolation methods, the proposed interpolation method based on Fractal model. FFT (Fast Fourier Transformation) method and Parametric Spline method has been conducted. 50 m meshed Digital Elevation Model (DEM) was sub-sampled by 5×5 results in 250 m meshed DEM. Then 250 m meshed DEM was interpolated with the aforementioned...
Article
A method for spatial resolution enhancement by means of inversion techniques is proposed. If the samples are overlapped, effective spatial resolution can be improved even if the instantaneous field of view (IFOV) of a satellite based sensor is large. Experimental results with MOS-1/VTIR data show almost twice of improvement of spatial resolution. I...
Article
An assessment of the influence of antenna pattern changes in microwave radiation estimation taking into account antenna pattern correction (APC) has been conducted. In the usual case, the antenna pattern cannot be known exactly and its changes are unknown in space. Under such conditions, the APC process is not always stable. Therefore it is importa...
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A label relaxation method with a proportional estimation of mixed pixels (mixels) which is based on inversion problem solving techniques with a previously estimated proportion of neighbouring mixels is proposed. The method allows us to check the connectivity of separated road segments which arc observed frequently in the remote sensing satellite im...
Article
A concept of a merged data set with ERS-1/ATSR, MOS-1/VTIR and NOAA/AVHRR is proposed. It is confirmed that the proposed merged data set is effective for diurnal change analysis of the sea surface temperature. The detectability of thin cirrus in the feature space consisting of 6.5 and 10.5 um channel data of MOS-1/VTIR is further confirmed.
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A new multi-criteria decision making method (Fuzzy Genetic Algorithm-Technique for Order Preference by Similarity to Ideal Solution: FGA-TOPSIS) is proposed for dealing with criteria and alternatives in a fuzzy environment. Genetic Algorithm (GA) is used to address the weights of criteria and then the best solution is determined by using the Techni...
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Referring to the Nagel–Schreckenberg's (NaSch) model, we have studied the impact of agent and diligent driver into the micro traffic model in the case of evacuation. This study is attention to the deceleration that added in the micro traffic model. The effect of deceleration to simulation for evacuation from disaster area is considered. The traffic...
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Tea estate monitoring system with ground based camera system (sensor network) and meteorological stations as well as satellite imagery data on a Geophysical Information System (GIS) is proposed. Appropriate tea estates can be found with satellite imagery data with a reference of vitality of the tea trees in tea estates derived from ground based cam...
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Method for sonification of multi-dimensional meteorological data, in particular, layered wind direction and speed data derived from Earth observation satellite data is proposed. Experimental results shows rapidly changing meteorological data can be listened with the different musical scale (melody), harmony, rhythm, and music instrument types. More...
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E-learning system with mathematical expressions and simulation capabilities is proposed. MathML based mathematical expressions and VRML and FlashMX based simulation capabilities are added to the conventional e-learning system. The experimental results show that 7-12.7% of improvement of achievement test score is observed for beginner students and a...
Article
Full-text available
Obstacle avoidance method fall into two broad categories: global path planning and local path planning. This paper considers the situation that the environment contains obstacles whose velocity and direction cannot be predicted. This type of obstacle is called transient obstacle. To avoid transient obstacles, this paper introduces a local path plan...
Article
Full-text available
Human Gait as the recognition object is the famous biometrics system recently. Many researchers had focused this issue to consider for a new recognition system. One of the important advantage in this recognition compare to other is it does not require observed subject's attention and assistance. There are many human gait datasets created within the...
Article
Full-text available
Methods for estimation of damage grade and damaged paddy field areas due to salt containing sea breeze with typhoon using remote sensing satellite imagery data is proposed. Due to a fact that Near Infrared: NIR camera data is proportional to vitality of vegetation, it is possible to estimate damage grade and damaged paddy field areas due to salt co...
Article
Full-text available
Human Gait as the recognition object is the famous biometrics system recently. Many researchers had focused this subject to consider for a new recognition system. One of the important advantage in this recognition compare to other is it does not require observed subject's attention and cooperation. There are many human gait datasets created within...