The disclosed structure achieves a desired balance between higher-rigidity and weight saving in a connection-type rocker arm which integrally rocks a plural of arm portions. The clock oscillation source is provided with an LPF and a VCO, wherein a clock signal outputted from the VCO is supplied to the STC counter and a timer within a stream multiplexing circuit. The phosphorus or arsenic is doped in an n-channel area. The servo data is transferred from the channel IC to the controller IC using one data protocol and user data is bidirectionally transferred between the channel IC and the controller IC using a different data protocol. The method comprises the following steps: projecting points of a next image to a three-dimensional space using camera parameters and depth map and projecting projected points from the three-dimensional space to reference image surface, thereby obtaining motion vectors for estimating changes between the next image and the reference image.