Visual analysis of human movement is a hot topic in the field of computer vision. A novel algorithm--column integral, speed up the head location, and has the more precision than previous algorithm. A head turning detection algorithm has been presented, which based on the color information of each space branch area and template match, and it is simple and effective. The experiment result indicate that the proposed algorithm has a good real-time performance, the improved head positioning algorithm can reduce by 1.24 ms than the similar algorithm in once position, and accuracy of the head turning detection algorithm can reach 92%.
To investigate the model of fatigue crack growth rate da/dN based on crack tip opening displacement (CTOD) as the driving parameter, the variation ranges [Formula: see text] by linear elastic fracture mechanics and [Formula: see text] by geometric principle of CTOD were deduced. The fitting relationships of [Formula: see text] and [Formula: see text] were attained through da/dN experiment by taking 17Cr16Ni2 stainless steel, and their discrepancies were compared. The results showed that at the early and middle periods, the relationships of [Formula: see text] and [Formula: see text] could be expressed by Paris law, and da/dN driven by [Formula: see text] was faster than that by [Formula: see text] notably; at the later period, the experimental data of [Formula: see text] and [Formula: see text] deviated from the fitted Paris curves and were above them with being crossed with each other; in the total variation range of CTOD, it was better to fit the relationships of [Formula: see text] and [Formula: see text] by polynomial method rather than Paris law.
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