This paper proposes a joint image segmentation and motion estimation technique for very low bit rate video coder. In the region-based coding, a segmentation algorithm is indispensable. Motivated by the observations of the conventional algorithm, we propose a jointly optimized image segmentation and motion estimation algorithm. In our algorithm, the input image is split into quad-tree structure, and the split regions are merged by greedy merging algorithm(GMA). In each step of GMA, two regions which have the minimum cost are merged. Since we have chosen the cost as the increase of DFD energy, the image is segmented into a set of regions with minimum DFD energy. By the computer simulation, we show the segmentation results have much lower DFD energy compared to the block-based motion estimation.
Vibro ripper worked by high frequency vibration is developed to do rock fragmentation and work of ripper is the different concept with other existing breakers. The gear box-shank welded joint of vibro ripper is very important part to deliver vibromotive force to tooth, so this part should endure high frequency vibration environments. The purposes of this study are to choose the optimal welding conditions for fatigue strength. The conditions were made using three kind of shank materials and two kind of filler metals. Shank materials are Hadox-hituf, Posten80 and AR400, and filler metals are CSF-71T and CSF-81T. The fatigue test was conducted each condition. Fracture surface was observed to estimate fracture characteristics of welded joint using SEM.
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