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Zhaocan Li,Guoqin Wu,Yunfang Liu,Jianmin Yu 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
The grain refinement and second phases evolution of Mg-13Gd-4Y-2Zn-0.4Zr sheet during the rotary forward extrusion(RFE) process were investigated. The microstructures were observed by using optical microscopy, scanning electron microscopy,electron backscatter diffraction, X-ray diffractometer, and transmission electron microscope. The result shows, the modifiedcellular automata model fully considers the influence of long-period stacking ordered phase on the dislocation density,which can predict the grain size evolution of Mg-Gd-Y-Zn-Zr alloy during the RFE process, and the relative error can becontrolled within 10%. With the increase of RFE revolutions, the average grain size firstly decreases quickly (RFE1–RFE25),and then increased gradually (RFE25–RFE100). The decreased grain size is related to the enhanced dynamic recrystallizationprocess as the c-axis of most grains is rotated continuously to a transverse direction and more random texture types areformed. The increase in grain size is linked with the solid solution of the second phase, and the limitation on grain growthdue to the pinning effect of the second phase almost disappears. In the early stage (RFE1–RFE25), the contribution percentageof grain refinement and solid solution strengthening to microhardness improvement is 180.6% and 61.7%, respectively. In the subsequent stage (RFE25–RFE100), the dislocation density strengthening and solid solution strengthening accountsfor 60% and 440% of the increase in microhardness, respectively.
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Hole-filling Based on Disparity Map for DIBR
( Ran Liu ),( Hui Xie ),( Fengchun Tian ),( Yingjian Wu ),( Guoqin Tai ),( Yingchun Tan ),( Weimin Tan ),( Bole Li ),( Hengxin Chen ),( Liang Ge ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.10
Due to sharp depth transition, big holes may be found in the novel view that is synthesized by depth-image-based rendering (DIBR). A hole-filling method based on disparity map is proposed. One important aspect of the method is that the disparity map of destination image is used for hole-filling, instead of the depth image of reference image. Firstly, the big hole detection based on disparity map is conducted, and the start point and the end point of the hole are recorded. Then foreground pixels and background pixels are distinguished for hole-dilating according to disparity map, so that areas with matching errors can be determined and eliminated. In addition, parallaxes of pixels in the area with holes and matching errors are changed to new values. Finally, holes are filled with background pixels from reference image according to these new parallaxes. Experimental results show that the quality of the new view after hole-filling is quite well; and geometric distortions are avoided in destination image, in contrast to the virtual view generated by depth-smoothing methods and image inpainting methods. Moreover, this method is easy for hardware implementation.
ScienceON
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