说明：  文中根据hough变换定位条码图像后，利用双线性插值将条码旋转至水平。然后定位单个字符。用投影法识别单个字符
(According to the hough transform the barcode image positioning, the use of bilinear interpolation to the level of the bar rotation. And then positioning a single character. Projection method used to identify individual characters)