The most serious problem for patients suffered from ALS (Amyotrophic Lateral Sclerosis), paralysis or tracheotomy is the lack of communication with others. As they cannot talk, important signs are missed or ignored.In this study we paid attention to patient's eye blinking and have developed a communication system. It is because that most patients can move their eyelids.There are some similar systems. However, almost all these systems require to set some sensors on the patient, and hence these systems are not suitable for long-term monitoring. In our new system, patients' blinkings are detected thorough the visualsensing system developed before, which can execute real-time subtraction of images upon motion picture from CCD camera.
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