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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：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：US07539354B2
公开(公告)日：2009-05-26
申请号：US11195644
申请日：2005-08-03
IPC分类号： G06K9/36
CPC分类号： G06K9/522
摘要： A method of generating a matching key for an image is disclosed. The matching key is substantially invariant to rotation, scale and translation. The method starts by forming a spatial domain representation of the image that is substantially invariant to translation of the image. Rotation and/or scaling in the spatial domain representation is next transformed 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 for the image.
摘要翻译： 公开了一种生成图像匹配密钥的方法。 匹配键对于旋转，缩放和平移几乎是不变的。 该方法通过形成图像的空间域表示开始，该图像的图像的翻译基本上是不变的。 随后将空间域表示中的旋转和/或缩放转换为转换以形成变换图像。 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的匹配键。
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公开(公告)号：US07532768B2
公开(公告)日：2009-05-12
申请号：US10569972
申请日：2004-11-04
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，仿射失真可以被反转（418）。
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公开(公告)号：US07158653B2
公开(公告)日：2007-01-02
申请号：US10323776
申请日：2002-12-20
IPC分类号： G06K9/00
CPC分类号： G06T1/0028 , G06T2201/0051 , H04N1/32203 , H04N1/32208 , H04N1/32288 , H04N21/8358
摘要： A method (750) of encoding a value is disclosed. In one implementation the value is encoded into an image (700). The method (750) operates by defining (403) a first ordered set of positions; determining (405) a number of marks for encoding the value in the ordered set of positions; determining (409) a selection of the first ordered set of positions using combinatorial theory with the number of marks and the number of positions in the first ordered set of positions for encoding the value; and placing (411) marks at the selection of the first ordered set of positions. Preferably the value is encoded by encoding a base value and an offset value, the base value is encoded by the number of marks, and the offset value is encoded by the selection of positions. Preferably the marks are basis patterns forming a watermark (710). A method is also disclosed of encoding the number of basis patterns used in the watermark (710), which comprises the steps of defining a further ordered set of positions in the image; and adding a mark to the image at one of the further ordered set of positions, the mark at the one position encoding the number of basis patterns used in the watermark (710).
摘要翻译： 公开了一种编码值的方法（750）。 在一个实现中，该值被编码成图像（700）。 方法（750）通过定义（403）第一有序位置集合来操作; 确定（405）用于对所述有序位置集合中的值进行编码的数量的标记; 使用组合理论确定（409）所述第一有序位置集合的选择，所述组合理论具有用于对所述值进行编码的所述第一有序位置集合中的标记数和位置数; 以及在选择第一有序位置集合时放置（411）标记。 优选地，通过对基本值和偏移值进行编码来编码该值，该基值由标记数量编码，并且该偏移值由位置的选择进行编码。 优选地，标记是形成水印的基本图案（710）。 还公开了一种编码在水印（710）中使用的基本模式的数量的方法，其包括以下步骤：在图像中定义另外有序的位置集合; 以及在所述另外有序的位置集合之一的图像中添加标记，所述标记在所述一个位置处编码在水印中使用的基本图案的数量（710）。
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公开(公告)号：US20100156987A1
公开(公告)日：2010-06-24
申请号：US12635788
申请日：2009-12-11
IPC分类号： B41J29/393 , G06K15/02
CPC分类号： B41J29/393 , G06K15/02 , G06K15/027 , H04N1/6033
摘要： Methods (700), apparatuses, systems (500) and computer program products for measuring spatial characteristics of an inkjet printer (200, 300) are disclosed. Group of marks (810/815) of a first predetermined pattern are printed (720) on a print medium (230) using a first group of nozzles (420). Groups of marks (820/825) of a second predetermined pattern are printed (720) using a second group of nozzles (420). A region of overlap of the printed groups of marks is formed. At least a portion of the print medium (230) having printed groups of marks is imaged. From the region of overlap, first and second groups of marks from the first and second printed patterns are selected (740). For each group of marks, a position representative of that group is determined An offset for measuring spatial characteristics of the printer (200, 300) between the first and second printed patterns is determined (750) dependent upon the representative position of each of the first and second group of marks.
摘要翻译： 公开了用于测量喷墨打印机（200,300）的空间特性的方法（700），装置，系统（500）和计算机程序产品。 使用第一组喷嘴（420）将第一预定图案的标记组（810/815）打印（720）在打印介质（230）上。 使用第二组喷嘴（420）打印（720）第二预定图案的标记组（820/825）。 形成印刷标记组的重叠区域。 具有打印的标记组的打印介质（230）的至少一部分成像。 从重叠区域，选择来自第一和第二印刷图案的第一组和第二组标记（740）。 对于每组标记，确定表示该组的位置。根据第一和第二印刷图案中的每一个的代表位置来确定用于测量第一和第二印刷图案之间的打印机（200,300）的空间特性的偏移（750） 和第二组标记。
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