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1. 发明授权

US06515770B1 Dither mask generation with calibration-independent number of threshold levels 有权
标题翻译：具有校准无关数阈值电平的抖动掩码生成
公开(公告)号：US06515770B1
公开(公告)日：2003-02-04
申请号：US09270042
申请日：1999-03-16
申请人： Ravishankar Rao , Gerhard R. Thompson , Charles P. Tresser , Chai W. Wu
发明人： Ravishankar Rao , Gerhard R. Thompson , Charles P. Tresser , Chai W. Wu
IPC分类号： G06K1500
CPC分类号： H04N1/4051 , H04N1/4078
摘要： Calibrated dither masks adaptable to most printers are constructed in such a way that the threshold values can be adapted to a printer so that said printer can print the originally intended number of distinct tone levels. This adaptation can be done computationally so that the time it takes is not prohibitive. Furthermore, the resulting calibrated dither mask is such that there is no need for a tone reproduction curve in the halftoning process.
摘要翻译：适用于大多数打印机的校准的抖动掩码被构造成使得阈值可以适应于打印机，使得所述打印机可以打印原始预期数量的不同色调级别。这种适应可以在计算上完成，所以它所需的时间并不太高。此外，所得到的校准抖动掩模使得在半色调处理中不需要色调再现曲线。

2. 发明授权

US06714318B1 Dithering method and apparatus for multitone printers 有权
标题翻译：多色打印机的抖动方法和装置
公开(公告)号：US06714318B1
公开(公告)日：2004-03-30
申请号：US09412645
申请日：1999-10-05
申请人： Charles H. Morris, III , Joan L. Mitchell , Chai W. Wu , Gerhard R. Thompson , Charles P. Tresser , Nenad Rijavec
发明人： Charles H. Morris, III , Joan L. Mitchell , Chai W. Wu , Gerhard R. Thompson , Charles P. Tresser , Nenad Rijavec
IPC分类号： H04N140
CPC分类号： H04N1/40087
摘要： Digital halftoning techniques in printers which construct and utilize a mask in a dithering algorithm for a multitone printer are generalized by using a decision matrix in conjunction with a dithering matrix. For each pixel in the image, pixel grey value and a mask threshold value are obtained. Based on these values, a decision is made on the grey level to be printed at each pixel. For extensions to multiple component color images, each component is treated independently as if it were a grey scale image. The mask threshold values and sizes are likely to be tuned per component and therefore different.
摘要翻译：通过使用结合抖动矩阵的决策矩阵来推广在多音频打印机的抖动算法中构造和利用掩码的打印机中的数字半色调技术。对于图像中的每个像素，获得像素灰度值和掩码阈值。基于这些值，对要在每个像素上打印的灰度级进行判定。对于多组分彩色图像的扩展，每个组件被独立地处理，就像它是灰度图像一样。掩模阈值和尺寸可能会被调整到每个组件，因此不同。

3. 发明授权

US06597813B1 Masks with modulated clustering and aperiodicity and rescaling of masks 有权
标题翻译：具有调制聚类和非周期性和面罩重新缩放的面具
公开(公告)号：US06597813B1
公开(公告)日：2003-07-22
申请号：US09265861
申请日：1999-03-11
申请人： Mikel J. Stanich , Gerhard R. Thompson , Charles P. Tresser , Chai W. Wu
发明人： Mikel J. Stanich , Gerhard R. Thompson , Charles P. Tresser , Chai W. Wu
IPC分类号： G06K936
CPC分类号： H04N1/4051
摘要： A technique combines most of the advantages of both blue noise and clustering in generating a partially clustered aperiodic mask and using it in a dither array algorithm for halftoning, such that the amount of clustering can be modulated. A method to create an enlarged partially clustered aperiodic dither mask, appearing as a modulated version of a periodic enlargement of original mask, is used when the original mask generates patterns that are not visually pleasing or the original mask doesn't generate enough distinct grey levels. The method of halftoning of grey scale images utilizes a pixel-by-pixel comparison of the image against a partially clustered aperiodic mask in which the clustered aperiodic mask is comprised of a partly random and partly deterministic single valued function which is designed to produce visually pleasing dot configurations when thresholded at any level of grey. A method for changing a number of distinct grey levels a mask can produce to be used in halftoning of grey scale images produces advantages for some printing devices.
摘要翻译：一种技术将蓝噪声和聚类的大部分优点结合在生成部分聚集的非周期性掩模中，并将其用于用于半色调的抖动阵列算法中，使得可以调制聚类量。当原始掩模产生不令人满意的图案或者原始掩模不产生足够的不同灰度级时，使用一种形成放大的部分聚集的非周期性抖动掩模的方法，作为原始掩模的周期性放大的调制版本。灰度图像的半色调的方法利用图像与部分聚集的非周期掩模的逐像素比较，其中聚集的非周期性掩模由部分随机和部分确定性的单值函数组成，其被设计为产生视觉上令人满意的在任何灰度级别进行阈值处理时的点配置。用于改变掩模可以产生用于灰度图像的半色调的不同灰度级数的方法为一些打印设备产生了优势。

4. 发明授权

US06834344B1 Semi-fragile watermarks 失效
标题翻译：半脆弱水印
公开(公告)号：US06834344B1
公开(公告)日：2004-12-21
申请号：US09398203
申请日：1999-09-17
申请人： Gaurav Aggarwal , Pradeep K. Dubey , Ashutosh Kulshreshtha , Marco Martens , Charles P. Tresser , Chai W. Wu
发明人： Gaurav Aggarwal , Pradeep K. Dubey , Ashutosh Kulshreshtha , Marco Martens , Charles P. Tresser , Chai W. Wu
IPC分类号： H04L900
CPC分类号： G06T1/005 , G06T1/0042 , H04N1/32144 , H04N1/32154 , H04N2201/327
摘要： A method is presented for marking high-quality digital images with a robust and invisible watermark. It requires the mark to survive and remain detectable and authenticatable through all image manipulations that in themselves do not damage the image beyond useability. These manipulations include JPEG “lossy” compression and, in the extreme, the printing and rescanning of the image. The watermark also has the property that it can detect if the essential contents of the image has changed. The first phase of the method comprises extracting a digest or number N from the image so that N only (or mostly) depends on the essential information content, such that the same number N can be obtained from a scan of a high quality print of the image, from the compressed form of the image, or in general, from the image after minor modifications (introduced inadvertently by processing, noise etc.). The second phase comprises the marking. This can be done in form of an invisible robust watermark, or in form of some visible signature or watermark.
摘要翻译：提出了一种用强大且不可见的水印标记高质量数字图像的方法。它需要标记生存，并通过所有图像操作保持可检测和可认证，这本身不会损害图像超出可用性。这些操作包括JPEG“有损”压缩，在极端情况下，打印和重新扫描图像。该水印还具有可以检测图像的基本内容是否已改变的属性。该方法的第一阶段包括从图像中提取摘要或数字N，使得仅N（或主要地）取决于基本信息内容，使得可以从扫描的高质量打印获得相同数量N 图像，从图像的压缩形式，或一般来说，从稍后修改的图像（通过处理，噪声等无意中引入）。第二阶段包括标记。这可以以不可见的鲁棒水印的形式或以一些可见的签名或水印的形式来完成。

5. 发明授权

US06807634B1 Watermarks for customer identification 失效
标题翻译：水印用于客户识别
公开(公告)号：US06807634B1
公开(公告)日：2004-10-19
申请号：US09449618
申请日：1999-11-30
申请人： Gordon W. Braudaway , Marco Martens , Frederick C. Mintzer , James B. Shearer , Charles P. Tresser , Chai W. Wu
发明人： Gordon W. Braudaway , Marco Martens , Frederick C. Mintzer , James B. Shearer , Charles P. Tresser , Chai W. Wu
IPC分类号： H04L900
CPC分类号： G06T1/0071 , H04N1/32 , H04N1/32144 , H04N1/32304 , H04N1/32352 , H04N2201/3236 , H04N2201/324 , H04N2201/327
摘要： A digital watermarking method encodes different pairs of watermarks into each of a plurality of images offered for use by a vendor. The watermarks in each pair are derived from two separate collections of watermarks and sufficiently different so as to prevent false positives. Because each pair of watermarks is assigned to a different customer relative to a particular image, unauthorized use of a digital image sold to a customer may be determined by locating the associated pair of watermarks assigned to the customer in the image. Collusion detection is also realized by forming each pair of masks from sub-collections of masks which are detectable in an image formed by combining the same images sold to one or more customers.
摘要翻译：数字水印方法将不同的水印对编码为提供供供应商使用的多个图像中的每一个。每对中的水印从两个独立的水印集合中得到，并且具有足够的不同，以防止误报。因为每一对水印被分配给相对于特定图像的不同客户，可以通过在图像中定位分配给客户的相关联的一对水印来确定销售给客户的数字图像的未经授权的使用。通过从通过组合销售给一个或多个客户的相同图像形成的图像中可检测到的掩模的子集合形成每对掩模也可实现共谋检测。

6. 发明授权

US06501390B1 Method and apparatus for securely determining aspects of the history of a good 有权
标题翻译：用于安全地确定商品历史的方面的方法和装置
公开(公告)号：US06501390B1
公开(公告)日：2002-12-31
申请号：US09228231
申请日：1999-01-11
申请人： Timothy J. Chainer , Claude A. Greengard , William R. Pulleyblank , Charles P. Tresser , Chai W. Wu
发明人： Timothy J. Chainer , Claude A. Greengard , William R. Pulleyblank , Charles P. Tresser , Chai W. Wu
IPC分类号： G08B2100
CPC分类号： G06K19/07381 , A61M5/5086 , A61M2205/27 , A61M2205/273 , A61M2205/6054 , G06K19/0717 , G06K19/0723 , G06K19/073 , G06K19/07372 , G07F9/02 , G07G1/0054
摘要： The present invention provides methods and apparatus to detect and reliably record the physical history of a product including effects due to one or more of the following: 1) product use 2) handling 3) tampering and 4) environment of the product (as changes in the environment, such as excessive temperatures, humidity, or shocks, can result in degradation to a product). The apparatus includes a “smart card”, or, more generally, “smart token”, in combination with one or more sensors which record the external influences on the product and/or the environment and records those changes in an encrypted form. This information can then be verified by any individual who is equipped with a (possibly public) decryption key, but capability to modify this information, depending on the application, is restricted to those with access to the encrypting key. Furthermore, the apparatus contains authentication information which can be reliably verified, in particular to confirm that the apparatus is attached to the product it supposed to be attached to.
摘要翻译：本发明提供了检测和可靠地记录产品的物理历史的方法和装置，其包括以下一个或多个的影响：1）产品使用2）处理3）篡改和4）产品的环境（如环境，如过高的温度，湿度或冲击，可能导致产品退化）。该装置包括与记录对产品和/或环境的外部影响并以加密形式记录这些改变的一个或多个传感器相结合的“智能卡”或更一般地，“智能令牌”。然后，可以由配备（可能是公共）解密密钥的任何个人验证该信息，但是根据应用来修改该信息的能力仅限于具有访问加密密钥的用户。此外，该装置包含能够被可靠地验证的认证信息，特别是确认该装置附着在其应该附着的产品上。

7. 发明授权

US06275599B1 Compressed image authentication and verification 失效
标题翻译：压缩图像认证和验证
公开(公告)号：US06275599B1
公开(公告)日：2001-08-14
申请号：US09143354
申请日：1998-08-28
申请人： Roy L. Adler , Bruce P. Kitchens , Charles P. Tresser , Chai W. Wu
发明人： Roy L. Adler , Bruce P. Kitchens , Charles P. Tresser , Chai W. Wu
IPC分类号： G06K900
CPC分类号： G06T1/0042 , G06T2201/0052 , G06T2201/0053
摘要： A watermarking method involves mostly invisible artifacts and is sensitive to any modification of the picture at the level of precision rendered by the compressed version of the image. The image is compressed according to a known compression standard, such as the JPEG standard, and with a fixed quality setting. Using the JPEG standard, the original image is cut into blocks to which the Discrete Cosine Transform (DCT) is applied and the DCT coefficients quantized. The watermark according to the invention is applied to the quantized DCT coefficients. This is done using an encryption function, such as a secret key/public key algorithm. The JPEG compression is then completed using a lossless compression scheme, such as Huffman coding, to produce the compressed and watermarked image. Authentication of the compressed and watermarked image begins with a lossless decompression scheme to obtain the set of quantized DCT coefficients. The coefficients are authenticated, and the DCT output of each block is dequantized. If necessary, an inverse DCT is applied to each block to output the decompressed watermarked image.
摘要翻译：水印方法主要涉及不可见的伪像，并且对图像的压缩版本呈现的精度水平对图像的任何修改都敏感。图像根据已知的压缩标准（例如JPEG标准）被压缩，并且具有固定的质量设置。使用JPEG标准，原始图像被切割成应用了离散余弦变换（DCT）并且DCT系数被量化的块。根据本发明的水印被应用于量化的DCT系数。这是使用加密功能完成的，例如秘密密钥/公钥算法。然后使用诸如霍夫曼编码的无损压缩方案完成JPEG压缩，以产生压缩和加水印的图像。压缩和加水印图像的认证以无损解压缩方案开始，以获得量化的DCT系数集合。系数被认证，并且每个块的DCT输出被去量化。如果需要，对每个块应用逆DCT以输出解压缩的水印图像。

8. 发明授权

US06450403B1 Method and apparatus for depositing ordinary checks from home or office 有权
标题翻译：从家庭或办公室存放普通支票的方法和装置
公开(公告)号：US06450403B1
公开(公告)日：2002-09-17
申请号：US09989697
申请日：2001-11-21
申请人： Marco Martens , Charles P. Tresser , Robert J. von Gutfeld , Chai W. Wu
发明人： Marco Martens , Charles P. Tresser , Robert J. von Gutfeld , Chai W. Wu
IPC分类号： G06F1760
CPC分类号： G06Q20/04 , G06K7/10861 , G06Q20/042
摘要： An apparatus and method allow to deposit ordinary checks from home or office. A special scanner is used to scan an endorsed check for deposit. The check may have printed thereon encryptions in at least selected locations. Scanning the endorsed check with the scanner to generates a digitized version of the check. The scanner virtually partitions the digitized version of the check into a plurality of regions. These regions may be stripes or zones. Each region is successively examined to extract from the digitized version of the check information from that region. The information extracted from a region is encrypted and transmitted to a bank. Upon acknowledgment from the bank, at least some of the regions of the plurality of regions voided by a form of indelible but non-invasive (e.g. allowing reading after voiding) marking such as punched holes, burned areas, overprinting of a pattern. The processing by the scanner continues until all regions have been processed. This progressively voiding scheme is an important security feature of the invention. The scanner is preferably contained in a secure housing with an encryption processor and the housing preferably includes an arrangement for detecting tampering and preventing normal operation if tampering is detected.
摘要翻译：一种装置和方法允许从家庭或办公室存放普通支票。使用特殊扫描仪扫描支票支票以进行存款。该检查可以在至少选定的位置上印刷有加密。用扫描仪扫描已核准的支票，以生成支票的数字化版本。扫描仪将支票的数字化版本实际上分成多个区域。这些区域可以是条纹或区域。连续检查每个区域以从该区域的检查信息的数字化版本中提取。从区域提取的信息被加密并传送到银行。在来自银行的确认之后，多个区域的至少一些区域通过不可磨灭但非侵入性的形式（例如，允许在排空之后读取）标记被消除，例如冲孔，烧焦区域，图案的套印。扫描仪继续处理，直到所有区域都被处理。这种逐渐排空方案是本发明的重要的安全特征。扫描器优选地包含在具有加密处理器的安全壳体中，并且壳体优选地包括用于检测篡改并且如果检测到篡改则防止正常操作的装置。

9. 发明授权

US6055065A Printer independent halftone image rendering 失效
标题翻译：打印机独立的半色调图像渲染
公开(公告)号：US6055065A
公开(公告)日：2000-04-25
申请号：US132881
申请日：1998-08-12
申请人： Ravishankar Rao , Gerhard Robert Thompson , Charles P. Tresser , Chai Wah Wu
发明人： Ravishankar Rao , Gerhard Robert Thompson , Charles P. Tresser , Chai Wah Wu
IPC分类号： H04N1/405 , H04N1/407 , G06F15/00
CPC分类号： H04N1/405 , H04N1/4078
摘要： A method and apparatus for matching the print outputs of two printers having different characteristics. For the purpose of laser printing, or more generally for reproduction on any printing device with limited number of printing levels, a color or grayscale image has to be transformed into an array of printing decisions at each pixel of the output image. Sometimes this array is the only available representation of the original image. One may desire to print this array on a printer with different characteristics from the printer for which the array was originally prepared. The method and apparatus solve this problem by generating a printing decision matrix which takes into account the differences between the two printers.
摘要翻译：一种用于匹配具有不同特征的两台打印机的打印输出的方法和装置。为了激光打印的目的，或者更通常地，在具有有限数量的打印级别的任何打印设备上再现，颜色或灰度图像必须被变换成输出图像的每个像素处的打印决定的阵列。有时这个数组是原始图像的唯一可用表示。可能希望在具有与原始准备阵列的打印机不同的特征的打印机上打印该阵列。该方法和装置通过产生考虑到两个打印机之间的差异的打印决策矩阵来解决这个问题。

10. 发明授权

US06982625B2 Event-recorder for transmitting and storing electronic signature data 有权
公开(公告)号：US06982625B2
公开(公告)日：2006-01-03
申请号：US10720352
申请日：2003-11-25
申请人： Timothy J. Chainer , Claude A. Greengard , Charles P. Tresser , Chai W. Wu
发明人： Timothy J. Chainer , Claude A. Greengard , Charles P. Tresser , Chai W. Wu
IPC分类号： G05B23/02
CPC分类号： G07C5/085 , G07C5/008 , G07C5/0858 , G08G1/205
摘要： An electronic event recorder for attachment to a vehicle is provided which can broadcast encrypted signature and data, thereby leaving behind an electronic version of a “fingerprint” in the event of an accident or traffic violation. The fingerprint, captured by an external data acquisition system or another vehicle so equipped, provides a history of events related to the vehicle. The event recorder is preferably integrated on a smart card and housed in a tamper proof casing. In a first mode of operation, monitoring stations along the roadways periodically send an interrogation signal, such as when radar detects that the vehicle is speeding. Upon receiving the interrogation signal the smart card transmits the vehicle's signature information to the monitoring station where it is time and date stamped along with the speed of the vehicle. In a second mode of operation, when a sensor detects a sudden or violent acceleration or deceleration, such as occurs during a collision, a smart card mounted in each car will exchange signature information automatically. This is particularly useful when the collision occurs in a parking lot when one of the hit vehicles is typically unattended.

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