公开(公告)号：US09704201B2

公开(公告)日：2017-07-11

申请号：US14446938

申请日：2014-07-30

Applicant: Xerox Corporation

Inventor： Orhan Bulan ,  Aaron M. Burry ,  Abu S. Islam ,  Peter Paul ,  David Martin Todd Jackson

IPC: G06K9/00 ,  G06Q40/08 ,  G06K9/32 ,  G06K9/46

CPC classification number: G06Q40/08 ,  G06K9/3258 ,  G06K9/4661

Abstract: A video sequence can be continuously acquired at a predetermined frame rate and resolution by an image capturing unit installed at a location. A video frame can be extracted from the video sequence when a vehicle is detected at an optimal position for license plate recognition by detecting a blob corresponding to the vehicle and a virtual line on an image plane. The video frame can be pruned to eliminate a false positive and multiple frames with respect to a similar vehicle before transmitting the frame via a network. A license plate detection/localization can be performed on the extracted video frame to identify a sub-region with respect to the video frame that are most likely to contain a license plate. A license plate recognition operation can be performed and an overall confidence assigned to the license plate recognition result.

公开(公告)号：US20160035037A1

公开(公告)日：2016-02-04

申请号：US14446938

申请日：2014-07-30

Applicant: Xerox Corporation

Inventor： Orhan Bulan ,  Aaron M. Burry ,  Abu S. Islam ,  Peter Paul ,  David Martin Todd Jackson

IPC: G06Q40/08 ,  G06K9/32 ,  G06K9/34

CPC classification number: G06Q40/08 ,  G06K9/3258 ,  G06K9/4661

Abstract: A video sequence can be continuously acquired at a predetermined frame rate and resolution by an image capturing unit installed at a location. A video frame can be extracted from the video sequence when a vehicle is detected at an optimal position for license plate recognition by detecting a blob corresponding to the vehicle and a virtual line on an image plane. The video frame can be pruned to eliminate a false positive and multiple frames with respect to a similar vehicle before transmitting the frame via a network. A license plate detection/localization can be performed on the extracted video frame to identify a sub-region with respect to the video frame that are most likely to contain a license plate. A license plate recognition operation can be performed and an overall confidence assigned to the license plate recognition result.

Abstract translation: 可以通过安装在位置的图像捕获单元以预定的帧率和分辨率连续地获取视频序列。 当在车牌识别的最佳位置检测到车辆时，可以通过检测与车辆相对应的车队和图像平面上的虚拟线路，从视频序列中提取视频帧。 在通过网络发送帧之前，可以修剪视频帧以消除相对于类似车辆的假正和多帧。 可以对所提取的视频帧执行车牌检测/定位，以识别相对于最可能包含车牌的视频帧的子区域。 可以执行车牌识别操作，并且得到分配给牌照识别的总体置信度。