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2. 发明授权

US6135353A 2-dimensional code reader 有权
标题翻译：二维码阅读器
公开(公告)号：US6135353A
公开(公告)日：2000-10-24
申请号：US176432
申请日：1998-10-21
申请人： Koji Konosu , Akio Sugiura , Tadao Nojiri , Kunihiro Motizuki
发明人： Koji Konosu , Akio Sugiura , Tadao Nojiri , Kunihiro Motizuki
IPC分类号： G06K7/00 , G06K7/10
CPC分类号： G06K7/10722
摘要： A 2-dimensional code reader includes a camera for scanning a surface which carries a 2-dimensional code thereon, an amplifier for amplifying electric signals fed from the camera, a device for identifying a code-region out of the scanned surface and a device for detecting information contained in the 2-dimensional code. The amplifying rate or gain is controlled according to a signal level representing a brightness of the identified code-region, not depending on a brightness of a whole scanned surface. The amplifier may includes an automatic gain controller which controls the amplifying rate according to the brightness of the whole scanned surface. In this case, the amplifying rate is adjusted based on an areal ratio of the code-region to the whole scanned surface area to obtain a clear image of the code, irrespective of the brightness of the scanned surface. Some symbol marks may be included in the 2-dimensional code in order to effectively identify the code-region on the scanned surface.
摘要翻译：二维码读取器包括用于扫描其上携带二维码的表面的照相机，用于放大从相机馈送的电信号的放大器，用于识别扫描表面之外的码区域的装置，以及用于检测包含在二维码中的信息。根据表示所识别的码区域的亮度的信号电平来控制放大率或增益，而不依赖于整个扫描表面的亮度。放大器可以包括自动增益控制器，其根据整个扫描表面的亮度来控制放大率。在这种情况下，无论扫描面的亮度如何，基于代码区域与整个扫描表面积的面积比调整放大率，以获得代码的清晰图像。为了有效地识别被扫描表面上的代码区，可以在二维码中包含一些符号标记。

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