Considerable improvements of information technologies (IT) allow consumers to enjoy various forms of multimedia services. Recently, 3D video has been established as a new format that provides more realistic and natural experiences to users by free-viewpoint TV (FTV). One of the main challenges is about rendering continuous viewpoint images using color and depth information. Thus, image interpol...

In this paper, we propose a visual assistance system that shows the scene behind a vehicle to its driver in the form of a virtual mirror by utilizing a surveillance camera. The virtual mirror will be displayed on a windshield display as if it were floating in the air in front of the vehicle. The driver entering an intersection can confirm the safety around the vehicle by checking the image in t...

Accurate sound speed estimates are desirable in a number of fields. In an effort to increase the spatial resolution of sound speed estimates, a new method is proposed for direct measurement of sound speed between arbitrary spatial locations. The method uses the sound speed estimator developed by Anderson and Trahey. Their least squares fit of the received waveform's curvature provides an estima...

In analyzing a signal, especially a non-stationary signal, it is often necessary the desired signal to be segmented into small epochs. Segmentation can be performed by splitting the signal at time instances where signal amplitude or frequency change. In this paper, the signal is initially decomposed into signals with different frequency bands using wavelet transform. Then, fractal dimension of ...

Spatial audio aims to recreate or synthesize spatial attributes when reproducing audio over loudspeakers or headphones. Such spatial attributes include, for example, locations of perceived sound sources and an auditory sense of space. This thesis focuses on new methods of spatial audio for loudspeaker listening and on measuring the quality of spatial audio by subjective and objective tests. In ...

using virtual social media and networks widely and relations based on electronic communication have transformed political and social activities in recent decades. the current essay aims to review the effects of virtual social media on the field of politics in iran. therefore, this essay propounds the questions: “how has the virtual social media caused transformation on the field of politics in ...

using virtual social media and networks widely and relations based on electronic communication have transformed political and social activities in recent decades. through this, in this essay we are going to review the effects of virtual social media on the field of politics in iran. therefore, this essay propounds the question that how has the virtual social media caused transformation on the f...

Background: Virtual education refers to a variety of teaching-learning methods that are implemented and supported electronically. The present study was conducted to determine the effects of group blogging on the attitude of nursing students towards virtual education.    Methods: This was a quasi-experimental pretest-posttest study in which all fifth-semester nursing students (n=25) w...