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1. 发明授权

US5651075A Automated license plate locator and reader including perspective distortion correction 失效
标题翻译：自动牌照定位器和阅读器，包括透视失真校正
公开(公告)号：US5651075A
公开(公告)日：1997-07-22
申请号：US521197
申请日：1995-08-30
申请人： James F. Frazier , Craig C. Reinhart , James F. Alves
发明人： James F. Frazier , Craig C. Reinhart , James F. Alves
IPC分类号： G06K9/32 , G06K9/42 , G06K9/64 , G06K9/00
CPC分类号： G06K9/6202 , G06K9/3258 , G06K9/42 , G06K2209/15
摘要： An automated license plate locator and reader (10) which provides novel methods for 1) correcting for perspective distortion (16), 2) locating the license plate (20), 3) reading the license plate (22) and 4) improving the confidence rating of the output signal (228). The novel method for accommodating a wide range of viewing geometries involves warping the image to eliminate perspective distortion of the plate resulting from roadside camera placement. The novel method for locating plates involves correlating an "idealized" edge template of a license plate with an edge-enhanced version of the image. Edge enhancement and shadow reduction is achieved by applying a Laplacian operator over the input image. Performance is further improved by filtering out distracting edges within the resulting correlation surface and then locating the highest peaks within this filtered correlation surface. The location of the highest peaks provides the location of the plate. The novel method for reading the license plates involves performing a modified binary correlation of an image of the plate with reference characters to provide output signals indicative of the symbols on the plate. This output is correlated with valid license plate signals to improve the confidence rating thereof.
摘要翻译：一种自动化牌照定位器和读取器（10），其提供用于1）校正透视失真（16）的新方法，2）定位车牌（20），3）读取车牌（22）和4）提高置信度输出信号的额定值（228）。用于适应宽范围的观看几何形状的新颖方法涉及扭曲图像以消除由路边相机放置产生的板的透视变形。用于定位板的新颖方法涉及将牌照的“理想化”边缘模板与图像的边缘增强版本相关联。通过在输入图像上应用拉普拉斯算子来实现边缘增强和阴影减少。通过滤除所得到的相关表面内的分心边缘，然后在该滤波的相关表面内定位最高峰，进一步提高性能。最高峰的位置提供了板的位置。用于读取车牌的新颖方法涉及用参考字符执行板的图像的修改的二进制相关性，以提供指示板上符号的输出信号。该输出与有效的牌照信号相关，以提高其信心等级。

2. 外观设计

USD269817S Aircraft tail position light 失效
公开(公告)号：USD269817S
公开(公告)日：1983-07-19
申请号：US204572
申请日：1980-11-06
申请人： James F. Frazier
设计人： James F. Frazier

3. 发明授权

US4803644A Alignment mark detector for electron beam lithography 失效
标题翻译：用于电子束光刻的对准标记检测器
公开(公告)号：US4803644A
公开(公告)日：1989-02-07
申请号：US778572
申请日：1985-09-20
申请人： James F. Frazier , Oberdan W. Otto , John Pasiecznik, Jr.
发明人： James F. Frazier , Oberdan W. Otto , John Pasiecznik, Jr.
IPC分类号： H01J37/304 , G01B15/00 , G01N23/00
CPC分类号： H01J37/3045
摘要： A hardware system is disclosed for detecting alignment marks on a substrate in connection with electron beam lithography. The system is considerably faster than prior software approaches. A scanning signal derived from backscattered electrons as the beam scans the substrate is stored and updated in a set of shift registers as scanning proceeds. The signals in the scanning shift registers are compared with a predetermined reference signal, corresponding to the expected scanning signal when the beam traverses an edge of an alignment mark, stored in another set of shift registers. A correlation is obtained between the scanning and reference signals by multiplying the values of the corresponding cells in the scanning and reference registers, and accumulating and weighting the result. The locations of the maximum positive and negative correlations, and hence the locations of the opposed edges of the alignment mark, are obtained by means of a timing mechanism coordinated with the scanning.
摘要翻译：公开了用于检测与电子束光刻有关的衬底上的对准标记的硬件系统。该系统比以前的软件方法快得多。随着扫描进行，随着扫描基板的反向散射电子的扫描信号被存储并更新在一组移位寄存器中。当存储在另一组移位寄存器中时，将扫描移位寄存器中的信号与预定的参考信号进行比较，该参考信号对应于期望的扫描信号，当波束穿过对准标记的边缘时。通过将扫描和参考寄存器中的相应单元格的值相乘，并对结果进行累积和加权，在扫描和参考信号之间获得相关性。通过与扫描协调的定时机制来获得最大正和负相关的位置以及因此对准标记的相对边缘的位置。

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