Including Wi-Fi functionality, mobile phone makes it possible to access internet via public wireless LAN services. However, there have been reported for some trouble on Wi-Fi networking by mobile phones and difficulties of their operation and settings. Our actual experiments at access points and our handlings of operating systems implemented in mobile phones clarify those problems. They are discussed from the users' point of view.
In personalization information interchange, some functional properties, e.g., font and ringtone require to be represented using multi-dimensional property values. In order to realize an alternative representation of those property values, property value reference information (a set of characteristic information) should be indispensable. This paper proposes property value reference information to interchange an illumination pattern and ringtone of mobile phones.
Recently, in diagnosis of pulmonary embolism and pulmonary tumor, CT images are used mainly. In the diagnosis of pulmonary embolism, the information of pulmonary arteries is important, and in the discrimination of the benign and malignant pulmonary tumors, the information of pulmonary veins is important. But it is impossible to distinguish easily between pulmonary arteries and pulmonary veins, because there are not differences of pulmonary arteries and pulmonary veins on CT values. We have developed a CAD system for classifying pulmonary arteries and pulmonary vessels and bronchial tubes using this relationship. We examined and compared lung blood vessels tracing originally by guidance of the doctor with the lung blood vessels distinguished by this method.
A color appearance model is very useful to reproduce color images of an imaged object under various illumination conditions, i.e., under various luminance levels and spectral power distributions. For this purpose, it is necessary to estimate spectral reflectances of an object being imaged at the spatial resolution of a camera pixel and to reproduce a color image of it under various illuminations using a color appearance model. Multi-band images of three different art paintings were captured by a multispectral camera and those image data were used to recover the spectral reflectances of the paintings. This paper describes the experimental results on the performance a color appearance which is called as CIECAM02.
The impression of an art painting largely changes with illuminations. It is required to accurately recover the spectral reflectances of the painting at the spatial resolutions of camera pixel in order to reproduce realistic color images of it under various illuminations. In this study, the experimental results on the spectral reflectances recovered by the use of color image data are described. Usually a color in a painting is not uniform in the two dimensional space, therefore it is very difficult to compare a measured and a recovered spectral reflectance since the measured spectral reflectance by a instrument is the average of the value over an area use for a measurement. This paper describes the experimental results on the comparison between the measured spectral reflectance and the average of the spectral reflectances recovered by plural pixels within the area.
In recent years, 3DCG character animation has been widely used in various fields. 3DCG character animation has time-line data. It is difficult to represent content of 3DCG character animation accurately using 2D image. Therefore, many methods to represent 3DCG character animation as 2D image have been suggested. However, there are few discussing on the viewpoint that is important for representing 3DCG character animation using 2D image. In this paper, we propose a method of locating optimal viewpoint that is easy to understand a motion of character. Our method illustrates the character and arrows that represent direction of motion from optimal viewpoint that the character and arrows is viewable well and a motion of character is understandable.
Particle filter is well known as a robust object tracking algorithm based on prediction with many distributed particles and is widely used for many practical applications. However, since conventional methods use one state transition model, the tracking accuracy is decreased for the objects with irregular motion. This paper proposes an adaptive particle filter based on inter-frame displacement which targets for irregular moving object tracking of vertical direction. By changing a state transition model based on inter-frame displacement associated with gravitational acceleration, the proposed method makes it possible to track stably even if the object suddenly change its direction. Evaluation results with a software simulation shows that the proposed method attains high tracking accuracy for a toss-up scene in volleyball compared with conventional ones.
Digital image processing has become a differentiating technology in a digital camera system, because of the recent progress in both of image processing algorithms and the semiconductor technology performing them. Not only basic functions such as demosaicing, noise reduction, tone management and high dynamic range imaging , but also face detection related functions, image stabilization based on image restoration and moving object tracking capabilities are developed and widely used. Engineers are still working to improve them and to create new image processing functions. In this lecture, I talk about the image processing technology used in the digital camera in order to accelerate the development.