It solves the difficulty in binarization due to gray level confusion between local background and image by automatic thresholding with local image enhancement.

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；

youdao

And,each player's observations and interactions with the local people vary greatly, depending on his background.

VOA: standard.2009.11.05

The complex piece of legislation included an interim provision that directed state and local officials to conduct background checks for prospective handgun purchasers.

NEWYORKER: Partners

The biggest bombshell in the new guidelines is that businesses complying with state or local laws that require employee background checks can still be targeted for EEOC lawsuits.

WSJ: James Bovard: Perform Criminal Background Checks at Your Peril

The Church says it is committed to reserving at least 25% of places in its new schools for pupils from the local neighbourhood regardless of faith background, and, in practice it says, most new Church of England schools reserve less than 50% for Christian applicants.

BBC: Bishop: 'Open school access, even if standards fall'