bvg意味着我们想要一个垂直方向的条形图，而且其中的柱形条是分组的(而非堆叠的)。

BVG means we want a bar chart that is vertically-oriented and the bars are grouped (as opposed to stacked).

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该算法首先对输入图像进行小波变换，在对小波变换后的垂直方向上的高频分量图进行二值化及规则限制。

Firstly, the input image is decomposed using wavelet. Then sub-image which corresponds to high frequency in vertical direction is binarised. Finally, prior knowledge is used to locate the text region.

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图3为如图1所示的空气清洁器在垂直操作方向上的左侧截面正视图；

FIG. 3 is a left side cross-sectional elevation view of the air purifier shown in FIG. 1 in the vertical operating orientation;

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