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efinition Still Picture Filing System using image cornpression technology is describ e configuration of the system,the structure of the s picture process or, and applications are described briefly. It is concluded at the quality of the reproduced picture image is quite satisfactory when it is used as a presentation aid.

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Recently, many researchers have been studying Brain Computer Interface (BCI) by which we can operate objects with analyzing Electroencephalogram (EEG) instead of hands. One of them, by using event related synchronization from EEG during motor imagery of each hand, discriminated right or left hand's movement [1]. However, these methods enable us to discriminate only a few classes. Furthermore,

Recently, many researchers have been studying the Brain Computer Interface (BCI). As one of its input signals, the EEG activity when users do motor imagery is analyzed in frequency domain to be detected ERD or ERS. Currently, however, these analysis methods require users' long-term training to detect them and get higher EEG recognition accuracy[1]. In this paper, to avoid these problems, we consider the analysis method for the EEG activity in time domain when subjects do 4 limbs motor imagery. Further, by the feature extraction relating to Movement-Related Cortical Potential(MRCP), we assess the relationship between features and recognition accuracy.