Human tactile perception has important characteristics, which are self-reference and bidirectionality. Self-reference indicates that tactile stimuli by the same object are different from other persons. It is an important factor for evaluating tactile sensations. Bidirectionality indicates that we adjust touch motion according to objects. It contributes the enhancement of the sensing capability. In this paper, tactile sensing considering self-reference and bidirectionality is presented. A prototype of the sensor is developed. Then, experiments are carried out on the valuation of roughness on the curved surface. Result shows the validity of the sensing and potential of its application.