OECD and UNESCO classify cross-border education into three types, population flow, program flow and institution flow.

OECD和UNESCO将跨境教育区分为人员流动、项目流动和机构流动三种方式。

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To classify different segmented regions as text regions or non-text regions, two features of the black to white pixel ratio (BWR) and the cross-count (CC) of pixels were used for the classifications.

对分割后的图像，本文采用黑白像素比（BWR）及黑白像素交替变换数（CC）两个特征进行进一步的分类。

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