公开(公告)号：US06042012A

公开(公告)日：2000-03-28

申请号：US162350

申请日：1998-09-28

申请人： Bryan L. Olmstead ,  Michael J. Ahten ,  Bruce E. Paris ,  Jorge L. Acosta ,  James W. Ring ,  Paul R. Huss ,  Jon P.C. Williams ,  Alexander M. McQueen ,  Randy L. Person

发明人： Bryan L. Olmstead ,  Michael J. Ahten ,  Bruce E. Paris ,  Jorge L. Acosta ,  James W. Ring ,  Paul R. Huss ,  Jon P.C. Williams ,  Alexander M. McQueen ,  Randy L. Person

IPC分类号： G06K7/00 ,  G06K7/10

CPC分类号： G06K7/10851 ,  G06K7/10702 ,  G06K7/10722 ,  G06K7/10752 ,  G06K7/10811 ,  G06K7/10881

摘要： A method and apparatus for reading bar codes or other images while reducing or eliminating the need for self-generated illumination. An image reader is preferably embodied as a handheld unit and comprises an efficient optical collection system including an aperture with a high aspect ratio and/or a multi-focal lens or lenses. An optically transmissive spacer affixed to the front of the handheld unit allows ambient light to be collected at close range, and a diffuser may be used to reflect ambient light from the handheld unit to provide additional illumination at close range. A masked CCD detector with rectangular pixels receives collected light and is coupled to an adaptive exposure circuit for preventing saturation of the CCD detector at high illumination levels. A correlated double sampling circuit coupled to the adaptive exposure circuit rejects common mode noise and allows operation in lower light levels. The correlated double sampling circuit is connected to a signal processor which uses a derivative based technique for detecting edges of the image. A decoder uses the edge detection information to decode encoded information from the image.

摘要翻译： 一种在减少或消除对自发光的需要的同时读取条形码或其他图像的方法和装置。 图像读取器优选地被实现为手持单元，并且包括具有高纵横比的孔和/或多焦点透镜或透镜的有效的光学收集系统。 固定在手持单元前部的光学透射间隔件允许在近距离范围内收集环境光，并且漫射器可用于反射来自手持单元的环境光，以在近距离范围内提供额外的照明。 具有矩形像素的屏蔽CCD检测器接收收集的光并且耦合到自适应曝光电路，以防止CCD检测器在高照明水平下的饱和。 耦合到自适应曝光电路的相关双采样电路拒绝共模噪声并且允许在较低的光级别下操作。 相关双采样电路连接到使用基于导数的技术来检测图像边缘的信号处理器。 解码器使用边缘检测信息来解码来自图像的编码信息。

公开(公告)号：US6073851A

公开(公告)日：2000-06-13

申请号：US162349

申请日：1998-09-28

申请人： Bryan L. Olmstead ,  Michael J. Ahten ,  Bruce E. Paris ,  Jorge L. Acosta ,  James W. Ring ,  Paul R. Huss ,  Jon P. C. Williams ,  Alexander M. McQueen ,  Randy L. Person

发明人： Bryan L. Olmstead ,  Michael J. Ahten ,  Bruce E. Paris ,  Jorge L. Acosta ,  James W. Ring ,  Paul R. Huss ,  Jon P. C. Williams ,  Alexander M. McQueen ,  Randy L. Person

IPC分类号： G06K7/00 ,  G06K7/10

CPC分类号： G06K7/10851 ,  G06K7/10702 ,  G06K7/10722 ,  G06K7/10752 ,  G06K7/10811 ,  G06K7/10881

摘要： A method and apparatus for reading bar codes or other images while reducing or eliminating the need for self-generated illumination. An image reader is preferably embodied as a handheld unit and comprises an efficient optical collection system including an aperture with a high aspect ratio and/or a multi-focal lens or lenses. An optically transmissive spacer affixed to the front of the handheld unit allows ambient light to be collected at close range, and a diffuser may be used to reflect ambient light from the handheld unit to provide additional illumination at close range. A masked CCD detector with rectangular pixels receives collected light and is coupled to an adaptive exposure circuit for preventing saturation of the CCD detector at high illumination levels. A correlated double sampling circuit coupled to the adaptive exposure circuit rejects common mode noise and allows operation in lower light levels. The correlated double sampling circuit is connected to a signal processor which uses a derivative based technique for detecting edges of the image. A decoder uses the edge detection information to decode encoded information from the image.

摘要翻译： 一种在减少或消除对自发光的需要的同时读取条形码或其他图像的方法和装置。 图像读取器优选地被实现为手持单元，并且包括具有高纵横比的孔和/或多焦点透镜或透镜的有效的光学收集系统。 固定在手持单元前部的光学透射间隔件允许在近距离范围内收集环境光，并且漫射器可用于反射来自手持单元的环境光以在近距离范围内提供额外的照明。 具有矩形像素的屏蔽CCD检测器接收收集的光并且耦合到自适应曝光电路，以防止CCD检测器在高照明水平下的饱和。 耦合到自适应曝光电路的相关双采样电路拒绝共模噪声并且允许在较低的光级别下操作。 相关双采样电路连接到使用基于导数的技术来检测图像边缘的信号处理器。 解码器使用边缘检测信息来解码来自图像的编码信息。

公开(公告)号：US5814803A

公开(公告)日：1998-09-29

申请号：US576203

申请日：1995-12-21

申请人： Bryan L. Olmstead ,  Michael J. Ahten ,  Bruce E. Paris ,  Jorge L. Acosta ,  James W. Ring ,  Paul R. Huss ,  Jon P.C. Williams ,  Alexander M. McQueen ,  Randy L. Person

发明人： Bryan L. Olmstead ,  Michael J. Ahten ,  Bruce E. Paris ,  Jorge L. Acosta ,  James W. Ring ,  Paul R. Huss ,  Jon P.C. Williams ,  Alexander M. McQueen ,  Randy L. Person

IPC分类号： G06K7/00 ,  G06K7/10

CPC分类号： G06K7/10851 ,  G06K7/10702 ,  G06K7/10722 ,  G06K7/10752 ,  G06K7/10811 ,  G06K7/10881

摘要： A method and apparatus for reading bar codes or other images while reducing or eliminating the need for self-generated illumination. An image reader is preferably embodied as a handheld unit and comprises an efficient optical collection system including an aperture with a high aspect ratio and/or a multi-focal lens or lenses. An optically transmissive spacer affixed to the front of the handheld unit allows ambient light to be collected at close range, and a diffuser may be used to reflect ambient light from the handheld unit to provide additional illumination at close range. A masked CCD detector with rectangular pixels receives collected light and is coupled to an adaptive exposure circuit for preventing saturation of the CCD detector at high illumination levels. A correlated double sampling circuit coupled to the adaptive exposure circuit rejects common mode noise and allows operation in lower light levels. The correlated double sampling circuit is connected to a signal processor which uses a derivative based technique for detecting edges of the image. A decoder uses the edge detection information to decode encoded information from the image.

摘要翻译： 一种在减少或消除对自发光的需要的同时读取条形码或其他图像的方法和装置。 图像读取器优选地被实现为手持单元，并且包括具有高纵横比的孔和/或多焦点透镜或透镜的有效的光学收集系统。 固定在手持单元前部的光学透射间隔件允许在近距离范围内收集环境光，并且漫射器可用于反射来自手持单元的环境光以在近距离范围内提供额外的照明。 具有矩形像素的屏蔽CCD检测器接收收集的光并且耦合到自适应曝光电路，以防止CCD检测器在高照明水平下的饱和。 耦合到自适应曝光电路的相关双采样电路拒绝共模噪声并且允许在较低的光级别下操作。 相关双采样电路连接到使用基于导数的技术来检测图像边缘的信号处理器。 解码器使用边缘检测信息来解码来自图像的编码信息。