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公开(公告)号：US07907795B2
公开(公告)日：2011-03-15
申请号：US11772546
申请日：2007-07-02
IPC分类号： G06K9/36
CPC分类号： H04N1/00681 , G06K9/3216 , H04N1/00702 , H04N1/00737 , H04N1/00761 , H04N1/00779
摘要： A system (100) and a method (500) are described for determining a two-dimensional position of a location in an image. The method (500) starts by imaging (510) a two-dimensional pattern (440). The two-dimensional pattern comprises a plurality of at least partially overlapping two-dimensional sub-patterns (410, 420, 430). The sub-patterns (410, 420, 430) repeat with different spatial periods to form the two-dimensional pattern, and the spatial period of the sub-patterns are anharmonic. A two-dimensional offset for each of the sub-patterns is then determined (540) at the location in the image formed by the imaging. The two-dimensional position is determined from said two-dimensional offsets.
摘要翻译： 描述了用于确定图像中的位置的二维位置的系统（100）和方法（500）。 方法（500）通过成像（510）二维图案（440）开始。 二维图案包括多个至少部分重叠的二维子图案（410,420,430）。 子图案（410,420,430）以不同的空间周期重复以形成二维图案，并且子图案的空间周期是非均匀的。 然后在由成像形成的图像中的位置处确定（540）每个子图案的二维偏移。 从所述二维偏移确定二维位置。
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公开(公告)号：US07853098B2
公开(公告)日：2010-12-14
申请号：US10555446
申请日：2004-07-02
IPC分类号： G06K9/32
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：US20090021551A1
公开(公告)日：2009-01-22
申请号：US12122270
申请日：2008-05-16
申请人： Peter Alleine Fletcher , Steven Parker , Ben Yip , Scott Alexander Rudkin , Kieran Gerard Larkin , Stephen James Hardy , Takeshi Yazawa
发明人： Peter Alleine Fletcher , Steven Parker , Ben Yip , Scott Alexander Rudkin , Kieran Gerard Larkin , Stephen James Hardy , Takeshi Yazawa
IPC分类号： B41J29/393
CPC分类号： B41J29/393
摘要： A method (300) is described of determining characteristic of an ink jet printer (15). A chart containing multiple regions or patches is printed (320) on a print medium (115) using the ink jet print (15). The chart includes at least a first region printed using a first set of nozzles, and at least a second region printed using a second set of nozzles. The first and second sets of nozzles are a predetermined distance apart in the printer head of the printer (15). The printing of the first and second regions is also separated by a print medium advance operation equal to the predetermined distance. This causes the first and second regions to be aligned in the direction of the print medium advance operation. The chart is then imaged using scanner (16) chart to form a chart image. The positions of the regions appearing in the chart image are next determined (340). The spatial alignment characteristic of the printer is calculated from the distance, in the medium advance direction, between said first and second regions.
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公开(公告)号：US08939540B2
公开(公告)日：2015-01-27
申请号：US12122270
申请日：2008-05-16
申请人： Peter Alleine Fletcher , Steven Parker , Ben Yip , Scott Alexander Rudkin , Kieran Gerard Larkin , Stephen James Hardy , Takeshi Yazawa
发明人： Peter Alleine Fletcher , Steven Parker , Ben Yip , Scott Alexander Rudkin , Kieran Gerard Larkin , Stephen James Hardy , Takeshi Yazawa
IPC分类号： B41J29/393
CPC分类号： B41J29/393
摘要： A method (300) is described of determining characteristic of an ink jet printer (15). A chart containing multiple regions or patches is printed (320) on a print medium (115) using the ink jet print (15). The chart includes at least a first region printed using a first set of nozzles, and at least a second region printed using a second set of nozzles. The first and second sets of nozzles are a predetermined distance apart in the printer head of the printer (15). The printing of the first and second regions is also separated by a print medium advance operation equal to the predetermined distance. This causes the first and second regions to be aligned in the direction of the print medium advance operation. The chart is then imaged using scanner (16) chart to form a chart image. The positions of the regions appearing in the chart image are next determined (340). The spatial alignment characteristic of the printer is calculated from the distance, in the medium advance direction, between said first and second regions.
摘要翻译： 描述了确定喷墨打印机（15）的特性的方法（300）。 使用喷墨打印（15）将包含多个区域或贴片的图形打印（320）在打印介质（115）上。 该图表包括使用第一组喷嘴打印的至少第一区域，以及使用第二组喷嘴打印的至少第二区域。 第一组和第二组喷嘴在打印机（15）的打印头中间隔预定距离。 第一和第二区域的打印也通过等于预定距离的打印介质提前操作来分离。 这使得第一和第二区域在打印介质提前操作的方向上对准。 然后使用扫描仪（16）图表将图表成像，以形成图表图像。 接下来确定出现在图表图像中的区域的位置（340）。 打印机的空间对准特性是从介质前进方向到所述第一和第二区域之间的距离来计算的。
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公开(公告)号：US08441697B2
公开(公告)日：2013-05-14
申请号：US12785042
申请日：2010-05-21
IPC分类号： H04N1/04
CPC分类号： H04N1/00002 , H04N1/00013 , H04N1/00031 , H04N1/00045 , H04N1/00053 , H04N1/00058 , H04N1/00068 , H04N1/00087 , H04N1/0009
摘要： A method determines displacements between pixels in a captured image of a reference pattern and corresponding pixels in the reference pattern including the steps of capturing the image of the reference pattern having a source pattern modulated by a plurality of carrier frequencies in a corresponding plurality of directions in the source pattern, demodulating at least three of the carrier frequencies in the captured image to form an amplitude image and a wrapped phase image for each of the carrier frequencies, and combining the wrapped phase images weighted by the amplitude images to determine the displacements between pixels in the captured image and corresponding pixels in the reference pattern.
摘要翻译： 一种方法确定参考图案的拍摄图像中的像素与参考图案中的对应像素之间的位移，包括以下步骤：捕获具有由相应多个方向上的多个载波频率调制的源图案的参考图案的图像 源图案，解调拍摄图像中的至少三个载波频率，以形成用于每个载波频率的振幅图像和包裹相位图像，以及组合由振幅图像加权的被包裹的相位图像，以确定像素之间的位移 在捕获的图像和参考图案中的相应像素。
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公开(公告)号：US07711140B2
公开(公告)日：2010-05-04
申请号：US11108712
申请日：2005-04-19
IPC分类号： G06K9/00
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，将关于要记录的N级图像的（在步骤2303中）解析为具有N个可能值的主要分量的图像的像素，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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公开(公告)号：US20090003601A1
公开(公告)日：2009-01-01
申请号：US12145963
申请日：2008-06-25
申请人： Stephen James Hardy , Kieran Gerard Larkin , Stephen Farrar , Peter Alleine Fletcher , Tuan Quang Pham
发明人： Stephen James Hardy , Kieran Gerard Larkin , Stephen Farrar , Peter Alleine Fletcher , Tuan Quang Pham
IPC分类号： H04L9/10
CPC分类号： G09C5/00
摘要： A method and system is disclosed for authenticating a physical medium (1405). The method starts by retrieving (1406) a reference digital signature (1412) previously determined (1403) based upon visual characteristics of an area (1402) of a reference physical medium (1400). A candidate digital signature (1415) is determined based upon visual characteristics of an area (1408) of the physical medium (1405), the area (1408) of the physical medium (1405) being at least partly corresponding to the area (1402) of the reference physical medium (1400). Weight values associated with different parts of at least one of the areas (1402 and 1408) are determined (201). Finally, the candidate digital signature (1415) is compared (1420) with the reference digital signature (1412), wherein the contributing of the parts in the comparison (1420) is based upon the weight values.
摘要翻译： 公开了用于认证物理介质（1405）的方法和系统。 该方法通过基于参考物理介质（1400）的区域（1402）的视觉特征来检索（1406）先前确定的参考数字签名（1402）（1403）。 基于物理介质（1405）的区域（1408）的视觉特性确定候选数字签名（1415），物理介质（1405）的区域（1408）至少部分地对应于区域（1402） 的参考物理介质（1400）。 确定与区域（1402和1408）中的至少一个区域的不同部分相关联的重量值（201）。 最后，将候选数字签名（1415）与参考数字签名（1412）进行比较，其中比较（1420）中的部分的贡献基于权重值。
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公开(公告)号：US07313249B2
公开(公告)日：2007-12-25
申请号：US10660623
申请日：2003-09-12
IPC分类号： G06K9/00
CPC分类号： G06T1/0064 , G06T2201/0052 , H04N19/467
摘要： A method (200) is disclosed of detecting one or more patterns embedded in an image. Each pattern embedded in the image has been formed from a one-dimensional basis function. The method (200) starts by calculating (210) a projective transform of the image. A 1-D correlation is then calculated (220) between the projective transform and the basis function for a selection of angles. Finally, one or more peaks of the correlation are found (230). The position of each of the peaks provides spatial parameters of one of the one or more embedded patterns.
摘要翻译： 公开了一种检测图像中嵌入的一个或多个图案的方法（200）。 图像中嵌入的每个图案已经由一维基函数形成。 方法（200）通过计算（210）图像的投影变换来开始。 然后计算投影变换和角度选择的基函数之间的一维相关性（220）。 最后，发现一个或多个相关峰（230）。 每个峰的位置提供一个或多个嵌入图案之一的空间参数。
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公开(公告)号：US08090218B2
公开(公告)日：2012-01-03
申请号：US10598939
申请日：2005-03-30
IPC分类号： G06K9/36
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：US20100302606A1
公开(公告)日：2010-12-02
申请号：US12785042
申请日：2010-05-21
CPC分类号： H04N1/00002 , H04N1/00013 , H04N1/00031 , H04N1/00045 , H04N1/00053 , H04N1/00058 , H04N1/00068 , H04N1/00087 , H04N1/0009
摘要： Disclosed is a method (700) for determining displacements between pixels in a captured image (601) of a reference pattern (501) and corresponding pixels in the reference pattern (501), said method comprising the steps of capturing the image (601) of the reference pattern (501) comprising a source pattern modulated by a plurality of carrier frequencies in a corresponding plurality of directions in the source pattern, demodulating (930) at least three of the carriers in the captured image (601) to form an amplitude image (1041) and a wrapped phase image (1100) for each of the carrier frequencies, and combining (1220) the wrapped phase images (1100) weighted by the amplitude images (1041) to determine said displacements between pixels in the captured image (601) and corresponding pixels in the reference pattern (501).
摘要翻译： 公开了一种用于确定参考图案（501）的捕获图像（601）中的像素与参考图案（501）中的对应像素之间的位移的方法（700），所述方法包括以下步骤：捕获图像（601）的图像 参考图案（501）包括由源图案中的相应多个方向上的多个载波频率调制的源图案，解调（930）拍摄图像（601）中的至少三个载波以形成幅度图像 （1041）和用于每个载波频率的包裹相位图像（1100），并且组合（1220）由幅度图像（1041）加权的包裹相位图像（1100），以确定捕获图像中的像素之间的所述位移（601 ）和参考图案（501）中的对应像素。
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