Theerawit Wilaiprasitporn

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In this paper, we present an unsharp masking-based approach with subsequent bilateral filtering stage to noise smoothing of ultrasound (US) image. At our first processing stage, we propose image segmentation via EM to segregate two pixels populations instead of separating original image into the low- and high-frequency components. Our proposed method then(More)
In this study, we propose visual stimulation based on the primary colors (red, green, and blue) in order to investigate the characteristics of the P300 response. Eleven healthy volunteers participated in our experiment, and their brain signals were recorded by electroencephalography (EEG). Using two basic measures referred to as `on-peak' and `off-peak' for(More)
Electrooculography (EOG) enables users to use specific eye movements as inputs for various applications, without using their fingers. However, online classification of such signals often requires long or sophisticated calibration procedures and multiple electrodes, which makes the resulting systems not practical for everyday use. To this end, a(More)
This research demonstrates the orientation-modulated attention effect on visual evoked potential. We combined this finding with our previous findings about the motion-modulated attention effect and used the result to develop novel visual stimuli for a personal identification number (PIN) application based on a brain-computer interface (BCI) framework. An(More)
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