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    • 1. 发明授权
    • Method of reading bar code
    • 阅读条码的方法
    • US06332574B1
    • 2001-12-25
    • US09438847
    • 1999-11-12
    • Hisashi ShigekusaMasami TanakaTadao Oshima
    • Hisashi ShigekusaMasami TanakaTadao Oshima
    • G06K504
    • G06K7/1092G06K7/10722G06K7/1093G06K7/14G06K7/1443G06K7/1491
    • A method of reading a bar code having guard bars at both sides thereof without fail even if the bar code image is highly distorted. An image region taken in by a CCD camera is scanned in horizontal and/or vertical directions to find out a first guard bar in the bar code. Then, a first scanning line for reading the bar code is set in a direction perpendicular to the first guard bar. The bar code is scanned along the first scanning line. If the first scanning line goes out of the bar code region, the first scanning line is traced back to a bar which is last read. Another scanning line starting from the last read bar and extending perpendicularly thereto is set to read the rest of the bar code. This process is repeated until the second guard bar is detected and a whole bar code is completely read. The first scanning line may be set, so that it only reads a predetermined number of bars and the rest of the bar code is read by new scanning lines starting from the last read bar. Alternatively, the bar code region is searched by preliminarily scanning the image region divided into plural rectangular sections. The bar code region is determined based on the number of brightness changes in each divided section. The first guard bar in the bar code can be easily found in this manner.
    • 即使条形码图像高度失真,也不会失败地读取其两侧具有保护条的条形码的方法。 通过CCD摄像机拍摄的图像区域在水平和/或垂直方向上扫描,以便在条形码中找到第一保护条。 然后,在与第一保护条垂直的方向上设置用于读取条形码的第一扫描线。 沿着第一条扫描线扫描条形码。 如果第一条扫描线超出条形码区域,则第一条扫描线将被追溯到最后读取的条形。 从最后一个读取条开始并垂直延伸的另一个扫描线被设置为读取条形码的其余部分。 重复该过程,直到检测到第二保护条,并且完全读取整个条形码。 可以设置第一扫描线,使得其仅读取预定数量的条,并且从最后读取条开始,通过新的扫描线读取其余条形码。 或者,通过预先扫描分割成多个矩形部分的图像区域来搜索条形码区域。 根据每个划分的部分中的亮度变化的数量来确定条形码区域。 条形码中的第一个保护条可以轻松地以这种方式找到。