Recently, wide and high-definition image projection is strongly required for making immersive environments in many kinds of application fields. Then, they tend to become huge and complex systems, and be only provided for limited users. Therefore, in this research, we propose an effective immersive projection technique with simple hardware, based on our visual characteristics. In our proposal, high-definition image projection tracing the central region of users' field-of-view with a controllable pan-tilt unit is combined with a wide view-angle and relatively low-resolution image projection covering the peripheral region of the view with simple projection systems. This architecture provides users a feeling of being surrounded with high-definition images.