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Belonging to the dynamic and real-time metrology, the key on 3D shape measurement of moving object is one-shot technology including one image acquisition, real-time processing and displaying. According to different speeds of motion, a few structured light methods such as spatial encoding, FTP, phase shifting method and spacetime stereo are introduced and summarized in the form of principle, development,...
An improved calibration algorithms have been proposed in this paper. With studying Zhang's calibration algorithm, we found that the distortion model contains only radial distortion, and the mathematical form of distortion model is not applicable. Using this model solving three-dimensional coordinates of the point in image will be calculated with greater error. The paper changed the mathematical form...
With the current commodity marker's counterfeits and inferior phenomenon, this paper presents a design of portable instrument for detecting trademark with digital watermark. The hardware structure of this detecting instrument is centering in S3C241 microprocessor, expanding peripheral interface, such as USB, human-computer interaction and so on. Detection software chooses a combination of DCT (Discrete...
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