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We propose a system that reduces laser display speckles by vibrating the light pipe. A small displacement of the light pipe appears to allow the total reflection of the laser, thereby resulting in a homogenized speckle field that changes with time. In this case, the speckle interference generated by the pattern projected by the laser through the light pipe destroys the spatial homogenization of the laser beams when the light pipe is vibrated. Moreover, when the light pipe begins the sequential vibration, the phases and paths of the beams are changed after the beams traverse the light pipe. Consequently, temporal speckle wavefront superposition can homogenize the luminous intensity distribution of the speckle pattern. This process reduces the speckle contrast to less than 4% while maintaining a luminous intensity of greater than 70%.

The practical ability is an important skill of college students majoring in physical education (PE). It can be subdivided into general practical ability and professional practical ability. This paper summarizes the current state of PE teaching practice in colleges, and applies classification and clustering algorithm to the comprehensive evaluation of the practical ability of PE teaching. The results show that the practical ability of PE majors is empirical, contextual, developmental, and personal. During the self-evaluation of practical ability, communication ability won the highest satisfaction among PE majors. In terms of social PE coaching ability, interpersonal communication ability won the highest satisfaction among PE majors. The research findings of this paper lay a basis for the curriculum reform of PE major, and the comprehensive evaluation of education practical ability.

Different from traditional panorama stereo acquisition technique shooting with numerous cameras, this study equips a double-symmetric prism in front of a single-lens camera to acquire images from four different angles of view, and the images acquired from the cameras every 20 degrees complete a pair of panorama stereo images with vertical angle of view ( ± 16 degrees) by image-based rendering. The panorama stereo acquisition technique reduces the number of cameras by three-fourth, and the acquired images contain vertical angles of view. Moreover, the image resolution is enhanced several times of the resolution of integral photography without moiré effect.