Using the 3D particle tracking velocimetry(3D PTV) technique,six runs of experiments on saltating motion of bed-load particles were performed with steady uniform flows with various particle diameters,densities and hydraulic gradients.

Based on the RS-232 communication protocol of DM642,the structure and working principle of the control sys- tem for the dual CCD synchronous movement are analyzed in detail.

Binocular vision research is one of the most active branches of computer vision research, including many research aspects such as dual channel video acquisition, dual CCD synchronous movement control, feature extraction, image matching, object localization and depth measurement.

A distributed servo control scheme based on CAN bus is presented,for the strict demand of motion synchronization among multi-axis of a servo system,a novel protocol model named "communication by time-sharing and executing on synchronization" is brought forward,and by this protocol,the motion synchronization among multi-axis depends less on the bandwidth of field-bus.