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公开(公告)号:US20060050985A1
公开(公告)日:2006-03-09
申请号:US11195644
申请日:2005-08-03
申请人: Stephen Hardy , Peter Fletcher , Kieran Larkin , Ian Gibson
发明人: Stephen Hardy , Peter Fletcher , Kieran Larkin , Ian Gibson
IPC分类号: G06K9/36
CPC分类号: G06K9/522
摘要: A method (500) of generating a matching key (599) for an image (501) is disclosed. The matching key (599) is substantially invariant to rotation, scale and translation. The method (500) starts by forming a spatial domain representation of the image (501) that is substantially invariant to translation of the image (501). Rotation and/or scaling in the spatial domain representation is next transformed (580) into translation to form a transformed image. A representation of the transformed image is then formed that is substantially invariant to translation of the transformed image. The representation of the transformed image is the matching key (599) for the image (501).
摘要翻译: 公开了一种生成图像(501)的匹配键(599)的方法(500)。 匹配键(599)对于旋转,缩放和平移几乎是不变的。 方法(500)通过形成对图像的翻译基本上不变的图像(501)的空间域表示开始。 随后将空间域表示中的旋转和/或缩放变换(580)到转换中以形成变换图像。 然后形成变换图像的表示,其对于变换图像的平移是基本上不变的。 变换图像的表示是图像(501)的匹配键(599)。
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公开(公告)号:US20070122060A1
公开(公告)日:2007-05-31
申请号:US10555446
申请日:2004-07-02
申请人: Stephen Hardy , Peter Fletcher , Kieran Larkin
发明人: Stephen Hardy , Peter Fletcher , Kieran Larkin
IPC分类号: G06K9/36
CPC分类号: G06T7/32
摘要: A method (200) of determining at least rotation and scale parameters of a transformation relating two images is disclosed. The method (200) starts by forming a spatial domain representation of each of the images that is invariant to translation of the images. A correlation in the log-polar domain is next performed between the representations. After detecting a magnitude peak in the correlation, the method (200) determines the rotation and scale parameters from the position of the magnitude peak.
摘要翻译: 公开了至少确定关于两个图像的变换的旋转和缩放参数的方法(200)。 方法(200)通过形成对图像的翻译不变的每个图像的空间域表示开始。 接下来在表示之间执行对数极域中的相关性。 在相关性中检测到幅度峰值之后,方法(200)从幅度峰值的位置确定旋转和比例参数。
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公开(公告)号:US20080019611A1
公开(公告)日:2008-01-24
申请号:US10598939
申请日:2005-03-30
申请人: Kieran Larkin , Peter Fletcher , Stephen Hardy
发明人: Kieran Larkin , Peter Fletcher , Stephen Hardy
IPC分类号: G06K9/32
CPC分类号: G06T7/001 , G06K9/6203 , G06T7/32 , G06T7/33
摘要: A method (1000) of measuring performance parameters of an imaging device (120, 160) is disclosed. The method (1000) maintains a test pattern image (1005), the test pattern image (1005) comprising alignment features and image analysis features. A test chart (110, 170) containing a representation of the test pattern image is next imaged using the imaging device (120, 160) to form a second image (1010). The test pattern image (1005) and the second image (1010) are then registered using region based matching (1035) operating on the alignment features. Finally, the performance parameters are measured by analysing (1060) the image analysis features.
摘要翻译: 公开了一种测量成像装置(120,160)的性能参数的方法(1000)。 方法(1000)维持测试图案图像(1005),测试图案图像(1005)包括对准特征和图像分析特征。 接下来,使用成像装置(120,160)对包含测试图案图像的表示的测试图(110,170)进行成像,以形成第二图像(1010)。 然后使用在对准特征上操作的基于区域的匹配(1035)来登记测试图案图像(1005)和第二图像(1010)。 最后,通过分析(1060)图像分析特征来测量性能参数。
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公开(公告)号:US20060157574A1
公开(公告)日:2006-07-20
申请号:US11305897
申请日:2005-12-19
申请人: Stephen Farrar , Stephen Hardy , Peter Fletcher , Kieran Larkin , Eric Cheung , Stephen Ecob
发明人: Stephen Farrar , Stephen Hardy , Peter Fletcher , Kieran Larkin , Eric Cheung , Stephen Ecob
IPC分类号: G06K19/06
CPC分类号: G06F21/608 , G06F21/64 , G06K19/06037 , G06K19/06046
摘要: A method, apparatus and computer program for generating a barcode (200) representing one or more portions of data is disclosed. A block-based correlatable pattern of data is generated and the generated data patterns are arranged according to a predetermined arrangement. The one or more portions of data are interdispersed with the arranged data patterns to generate the barcode (200).
摘要翻译: 公开了一种用于生成表示一个或多个数据部分的条形码(200)的方法,装置和计算机程序。 产生基于块的相关的数据模式,并且根据预定的布置来排列生成的数据模式。 数据的一个或多个部分与布置的数据图案分散以产生条形码(200)。
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公开(公告)号:US20070092159A1
公开(公告)日:2007-04-26
申请号:US10569972
申请日:2004-11-04
申请人: Kieran Larkin , Peter Fletcher
发明人: Kieran Larkin , Peter Fletcher
CPC分类号: G06T1/0064 , G06T7/32 , G06T2207/20164
摘要: A method (400) is disclosed for estimating an affine relation between a first image and a second image. The first and second images each have at least 4 non-parallel lines therein. The method (400) starts by identifying (406) sets of intersection points of the lines appearing in each of the images. The method (400) then determines (412) whether a relation between intersection points exists. If the relation exists then the first and second images are affine related and the affine distortion may be inverted (418).
摘要翻译: 公开了一种用于估计第一图像和第二图像之间的仿射关系的方法(400)。 第一和第二图像各自在其中具有至少4个非平行线。 方法(400)通过识别(406)出现在每个图像中的线的交集点开始。 方法(400)然后确定(412)是否存在交点之间的关系。 如果存在关系,则第一和第二图像是仿射相关的,并且仿射失真可以被反转(418)。
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公开(公告)号:US20050111691A1
公开(公告)日:2005-05-26
申请号:US10499141
申请日:2002-12-18
申请人: Kieran Larkin , Peter Fletcher
发明人: Kieran Larkin , Peter Fletcher
CPC分类号: G06K9/6203 , G06F17/15
摘要: A method (200) of enhanced peak detection in a correlation signal (g(x)) is disclosed. The method (200) comprises identifying (215) in the correlation signal (g(x)) positions where the modulus value of the correlation signal is above a first predetermined value. Each of the identified positions is then processed by forming (220) a sub-signal from the correlation signal by isolating a region of samples, the region comprising substantially equal numbers of samples on opposite sides of the identified position. The sub-signal is then up-sampled (221, 222, 225) to a higher resolution using Fourier interpolation. The up-sampled sub-signal is searched (230) for a peak value, and when the peak value is greater than a second predetermined value, parameters associated with the peak value is stored (236).
摘要翻译: 公开了一种在相关信号(g(x))中增强峰值检测的方法(200)。 方法(200)包括在相关信号(g(x))中识别(215)相关信号的模数值高于第一预定值的位置。 然后通过分离样本区域来形成(220)来自相关信号的子信号来处理所识别的位置,所述区域包括在所识别的位置的相对侧上基本上相等数量的样本。 然后使用傅立叶插值将子信号上采样(221,222,225)到更高的分辨率。 搜索上采样子信号(230)的峰值,并且当峰值大于第二预定值时,存储与峰值相关联的参数(236)。
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公开(公告)号:US20050242568A1
公开(公告)日:2005-11-03
申请号:US11108712
申请日:2005-04-19
申请人: Timothy Long , Peter Fletcher , Stephen Hardy
发明人: Timothy Long , Peter Fletcher , Stephen Hardy
CPC分类号: G07D7/20
摘要: An anti-tampering method for processing documents is disclosed. The method comprises, in regard to an encoding step, the steps of resolving (in a step 2303) in regard to an N-level image to be recorded, a pixel of the image into a major component having N possible values, selecting (in the step 2303) a pattern element depending upon the major component and the position of the pixel in the image, and recording the selected pattern element (in a step 2308) onto a transfer medium. In regard to a corresponding decoding step the method comprises extracting (in a step 2405) from the recorded document, a retrieved pattern element for said pixel, determining a pattern element (in a step 2407) depending upon a major component extracted from the retrieved pattern element and the position of the pixel on the recorded document, and comparing (in a step 2409) the retrieved pattern element and the said determined pattern element.
摘要翻译: 公开了一种处理文件的防篡改方法。 该方法包括关于编码步骤的步骤(在步骤2303中)将要记录的N级图像解析为图像的像素为具有N个可能值的主要分量,选择(在 步骤2303)取决于图像中的主要成分和像素的位置的图案元素,并将所选择的图案元素(在步骤2308中)记录到转印介质上。 关于相应的解码步骤,该方法包括从记录的文档中提取(在步骤2405中),用于所述像素的检索的图案元素,根据从检索的图案提取的主要成分来确定图案元素(在步骤2407中) 元素和记录文档上的像素的位置,并且(在步骤2409中)比较检索到的图案元素和所确定的图案元素。
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