通过局部图像增强的自动阈值选择等手段，解决视网膜血管图像与局部背景之间因灰度混同所造成的二值化困难；
It solves the difficulty in binarization due to gray level confusion between local background and image by automatic thresholding with local image enhancement.
阿特兰蒂斯穿梭机装载区局部视图，尾脊轨道操作系统打开，对接机构显现，背景是地球。
A partial view of Space Shuttle Atlantis' payload bay, vertical stabiliser, orbital manoeuvring system pods and docking mechanism are seen with the Earth in the background.
而现阶段，我国在整体教育不足、人力资源匮乏的背景下，大学毕业生就业出现了局部过度教育现象。
While at present, on the background of under-education and deficiency in the human capital, over-education occurred on graduates in our country.
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