US Patent No: 5,721,788

Number of patents in Portfolio can not be more than 2000

Method and system for digital image signatures

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A method and system for embedding signatures within visual images in both digital representation and print or film. A signature is inseparably embedded within the visible image, the signature persisting through image transforms that include resizing as well as conversion to print or film and back to digital form. Signature points are selected from among the pixels of an original image. The pixel values of the signature points and surrounding pixels are adjusted by an amount detectable by a digital scanner. The adjusted signature points form a digital signature which is stored for future identification of subject images derived from the image. In one embodiment, a signature is embedded within an image by locating relative extrema in the continuous space of pixel values and selecting the signature points from among the extrema. Preferably, the signature is redundantly embedded in the image such that any of the redundant representations can be used to identify the signature. Identification of a subject image includes ensuring that the subject image is normalized with respect to the original image or the signed image. Preferably, the normalized subject image is compared with the stored digital signature.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
INTERACTIVE HOME SYSTEMSBEAVERTON, OR10

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nitzberg, Mark J Cambridge, MA 17 1417
Powell, Robert D Issaquah, WA 21 1381

Cited Art Landscape

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* Cited By Examiner

Patent Citation Ranking

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L-1 Identify Solutions (1)
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MULTIMEDIA WATERMARKING, LLC (1)
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WISTARIA TRADING LTD (66)
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7,095,874 Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data 65 2003
7,287,275 Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth 51 2003
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7,761,712 Steganographic method and device 46 2005
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8,467,525 Steganographic method and device 2 2010
8,307,213 Method and system for digital watermarking 10 2010
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8,265,278 System and methods for permitting open access to data objects and for securing data within the data objects 10 2010
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8,473,746 Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth 0 2011
8,739,295 Secure personal content server 0 2012
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7,185,358 Method and apparatus for preventing reuse of text, images and software transmitted via networks 14 2000
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6,922,693 Method and system for copy protection of images displayed on a computer monitor 13 2000
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7,068,811 Protecting images with image markings 17 2002
6,614,915 Image capture and marking 25 2002
7,136,503 Encoding hidden data 8 2005
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7,593,545 Determining whether two or more creative works correspond 5 2008
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6,400,827 Methods for hiding in-band digital data in images and video 125 1999
6,343,138 Security documents with hidden digital data 240 1999
6,311,214 Linking of computers based on optical sensing of digital data 658 1999
7,055,034 Method and apparatus for robust embedded data 29 1999
* 6,879,701 Tile-based digital watermarking techniques 132 1999
* 6,700,990 Digital watermark decoding method 181 1999
6,408,331 Computer linking methods using encoded graphics 144 1999
* 6,636,615 Methods and systems using multiple watermarks 192 1999
* 6,307,949 Methods for optimizing watermark detection 127 1999
6,587,821 Methods for decoding watermark data from audio, and controlling audio devices in accordance therewith 97 1999
6,542,618 Methods for watermark decoding 84 1999
6,539,095 Audio watermarking to convey auxiliary control information, and media embodying same 94 1999
* 6,381,341 Watermark encoding method exploiting biases inherent in original signal 184 1999
6,363,159 Consumer audio appliance responsive to watermark data 170 1999
7,044,395 Embedding and reading imperceptible codes on objects 119 1999
* 6,408,082 Watermark detection using a fourier mellin transform 213 1999
6,286,036 Audio- and graphics-based linking to internet 233 1999
6,577,746 Watermark-based object linking and embedding 110 1999
6,560,349 Audio monitoring using steganographic information 105 1999
7,522,728 Wireless methods and devices employing steganography 20 2000
6,330,335 Audio steganography 206 2000
6,983,051 Methods for audio watermarking and decoding 79 2000
6,574,350 Digital watermarking employing both frail and robust watermarks 217 2000
6,625,297 Self-orienting watermarks 63 2000
* 6,289,108 Methods for detecting alteration of audio and images 156 2000
* 6,614,914 Watermark embedder and reader 581 2000
6,965,682 Data transmission by watermark proxy 78 2000
6,608,919 Method and apparatus for encoding paper with information 17 2000
* 6,353,672 Steganography using dynamic codes 147 2000
6,266,430 Audio or video steganography 221 2000
6,868,497 Method and apparatus for automatic ID management 25 2000
6,963,884 Recoverable digital content degradation: method and apparatus 5 2000
* 6,611,607 Integrating digital watermarks in multimedia content 259 2000
7,945,781 Method and systems for inserting watermarks in digital signals 32 2000
* 6,775,392 Computer system linked by using information in data objects 173 2000
* 6,590,996 Color adaptive watermarking 251 2000
6,567,533 Method and apparatus for discerning image distortion by reference to encoded marker signals 146 2000
6,553,129 Computer system linked by using information in data objects 224 2000
7,346,184 Processing methods combining multiple frames of image data 27 2000
* 6,424,725 Determining transformations of media signals with embedded code signals 159 2000
8,094,949 Music methods and systems 12 2000
6,631,198 Perceptual modeling of media signals based on local contrast and directional edges 27 2000
6,411,725 Watermark enabled video objects 369 2000
* 6,681,029 Decoding steganographic messages embedded in media signals 210 2000
6,788,800 Authenticating objects using embedded data 123 2000
6,542,620 Signal processing to hide plural-bit information in image, video, and audio data 111 2000
* 6,714,683 Wavelet based feature modulation watermarks and related applications 66 2000
6,647,128 Method for monitoring internet dissemination of image, video, and/or audio files 194 2000
6,965,873 Electronic commerce using optical input device 37 2000
* 6,683,966 Watermarking recursive hashes into frequency domain regions 88 2000
6,512,837 Watermarks carrying content dependent signal metrics for detecting and characterizing signal alteration 119 2000
8,103,542 Digitally marked objects and promotional methods 8 2000
7,346,776 Authenticating media signals by adjusting frequency characteristics to reference values 22 2000
6,757,406 Steganographic image processing 69 2001
6,567,535 Steganographic system with changing operations 53 2001
6,430,302 Steganographically encoding a first image in accordance with a second image 155 2001
* 6,522,771 Processing scanned security documents notwithstanding corruptions such as rotation 80 2001
6,760,463 Watermarking methods and media 145 2001
6,829,368 Establishing and interacting with on-line media collections using identifiers in media signals 292 2001
7,072,487 Watermark detection using adaptive color projections 20 2001
* 2001/0010,730 Steganographic messaging through imagery 22 2001
7,111,168 Digital watermarking systems 40 2001
6,580,808 Method and apparatus for discerning image distortion by reference to encoded marker signals 136 2001
7,127,744 Method and apparatus to protect media existing in an insecure format 59 2001
7,051,086 Method of linking on-line data to printed documents 165 2001
7,373,513 Transmarking of multimedia signals 17 2001
* 2002/0009,208 Authentication of physical and electronic media objects using digital watermarks 224 2001
* 6,590,997 Files and methods employing common information in both header and steganographic embedding 105 2001
7,958,359 Access control systems 6 2001
7,366,908 Digital watermarking with content dependent keys and autocorrelation properties for synchronization 14 2001
7,098,931 Image management system and methods using digital watermarks 27 2001
6,675,146 Audio steganography 125 2001
* 6,560,350 Methods for detecting alteration of audio 38 2001
6,542,927 Linking of computers based on steganographically embedded digital data 285 2001
6,721,440 Low visibility watermarks using an out-of-phase color 132 2001
6,771,796 Methods for identifying equipment used in counterfeiting 50 2001
6,959,386 Hiding encrypted messages in information carriers 66 2001
* 6,590,998 Network linking method using information embedded in data objects that have inherent noise 85 2001
7,362,781 Wireless methods and devices employing steganography 30 2001
6,763,123 Detection of out-of-phase low visibility watermarks 109 2001
7,116,781 Counteracting geometric distortions in watermarking 93 2001
7,058,697 Internet linking from image content 129 2001
* 2002/0078,146 Internet linking from audio and image content 12 2001
6,718,046 Low visibility watermark using time decay fluorescence 125 2001
7,277,468 Measuring quality of service of broadcast multimedia signals using digital watermark analyses 25 2001
8,332,478 Context sensitive connected content 14 2001
6,993,149 Embedding digital watermarks in spot colors 10 2001
6,920,232 Watermark encoding using arbitrary features 89 2001
7,607,016 Including a metric in a digital watermark for media authentication 23 2001
6,970,573 Self validating security documents utilizing watermarks 95 2001
6,738,495 Watermarking enhanced to withstand anticipated corruptions 105 2001
6,744,906 Methods and systems using multiple watermarks 91 2001
6,728,390 Methods and systems using multiple watermarks 105 2001
7,050,603 Watermark encoded video, and related methods 128 2001
7,289,643 Method, apparatus and programs for generating and utilizing content signatures 221 2001
* 6,519,352 Encoding and decoding in accordance with steganographically-conveyed data 71 2002
6,763,124 Embedding digital watermarks in spot colors 29 2002
7,437,430 Network linking using index modulated on data 66 2002
6,654,480 Audio appliance and monitoring device responsive to watermark data 82 2002
7,054,463 Data encoding using frail watermarks 63 2002
6,850,626 Methods employing multiple watermarks 79 2002
6,804,376 Equipment employing watermark-based authentication function 50 2002
7,111,170 Distributed system for responding to watermarked documents 93 2002
6,912,295 Enhancing embedding of out-of-phase signals 30 2002
6,891,959 Hiding information out-of-phase in color channels 28 2002
6,804,377 Detecting information hidden out-of-phase in color channels 55 2002
6,917,724 Methods for opening file on computer via optical sensing 172 2002
6,694,042 Methods for determining contents of media 129 2002
6,694,043 Method of monitoring print data for text associated with a hyperlink 138 2002
6,567,780 Audio with hidden in-band digital data 77 2002
6,647,129 Method and system for encoding image and audio content 117 2002
7,171,018 Portable devices and methods employing digital watermarking 134 2002
7,519,819 Layered security in digital watermarking 18 2002
7,043,052 Digital authentication with analog documents 55 2002
6,754,377 Methods and systems for marking printed documents 86 2002
6,978,036 Tamper-resistant authentication techniques for identification documents 70 2002
7,039,214 Embedding watermark components during separate printing stages 24 2002
6,869,023 Linking documents through digital watermarking 42 2002
6,647,130 Printable interfaces and digital linking with embedded codes 172 2002
* 7,103,197 Arrangement for embedding subliminal data in imaging 48 2002
* 6,922,480 Methods for encoding security documents 28 2002
6,700,995 Applying digital watermarks using dot gain correction 99 2002
6,718,047 Watermark embedder and reader 144 2002
7,113,596 Embedding information related to a subject of an identification document in the identification document 65 2002
7,113,614 Embedding auxiliary signals with multiple components into media signals 210 2002
7,054,465 Data hiding method and system for embedding and extracting information in signals 124 2002
7,720,249 Watermark embedder and reader 51 2002
7,224,819 Integrating digital watermarks in multimedia content 118 2002
8,505,108 Authentication using a digital watermark 2 2002
7,577,841 Watermark placement in watermarking of time varying media signals 5 2002
* 6,768,808 Encoding and decoding methods in which decryption data is conveyed steganographically within audio or visual content 67 2002
7,158,654 Image processor and image processing method 93 2003
6,768,809 Digital watermark screening and detection strategies 121 2003
6,804,378 Methods and products employing biometrics and steganography 38 2003
7,113,615 Watermark embedder and reader 129 2003
7,308,110 Methods for marking images 92 2003
7,263,203 Digital watermarks 63 2003
7,502,937 Digital watermarking security systems 17 2003
* 2004/0128,512 Digital watermarking systems 36 2003
7,499,564 Methods for decoding watermark data from audio, and controlling audio devices in accordance therewith 55 2003
7,181,022 Audio watermarking to convey auxiliary information, and media embodying same 86 2003
* 7,003,132 Embedding hidden auxiliary code signals in media 67 2003
8,190,901 Layered security in digital watermarking 6 2003
6,917,691 Substituting information based on watermark-enable linking 27 2003
7,286,684 Secure document design carrying auxiliary machine readable information 58 2003
* 2004/0125,125 Embedded data windows in audio sequences and video frames 26 2003
7,391,880 Color adaptive watermarking 99 2003
* 2004/0125,983 Color adaptive watermarking 25 2003
6,987,862 Video steganography 111 2003
7,567,721 Digital watermarking of low bit rate video 15 2003
7,050,201 Method and apparatus for encoding paper with information 4 2003
* 6,975,746 Integrating digital watermarks in multimedia content 128 2003
7,770,013 Digital authentication with digital and analog documents 29 2003
7,016,516 Authentication of identification documents 57 2003
* 2004/0153,649 Digital authentication with digital and analog documents 107 2003
8,438,395 Digitally watermarking documents associated with vehicles 0 2003
6,993,153 Self-orienting watermarks 8 2003
7,088,844 Perceptual modeling of media signals based on local contrast and directional edges 16 2003
* 2004/0136,565 Perceptual modeling of media signals based on local contrast and directional edges 2 2003
8,543,823 Digital watermarking for identification documents 1 2003
7,986,806 Paper products and physical objects as means to access and control a computer or to navigate over or act as a portal on a network 23 2004
* 2005/0013,462 Paper products and physical objects as means to access and control a computer or to navigate over or act as a portal on a network 82 2004
RE40919 Methods for surveying dissemination of proprietary empirical data 90 2004
8,243,980 Image processing using embedded registration data to determine and compensate for geometric transformation 6 2004
* 2004/0264,733 Image processing using embedded registration data to determine and compensate for geometric transformation 84 2004
7,027,614 Hiding information to reduce or offset perceptible artifacts 110 2004
7,152,786 Identification document including embedded data 22 2004
8,094,869 Fragile and emerging digital watermarks 9 2004
7,436,976 Digital watermarking systems and methods 24 2004
7,760,902 Content objects with computer instructions steganographically encoded therein, and associated methods 21 2004
7,164,413 Enhanced input peripheral 48 2004
7,706,565 Multi-channel digital watermarking 12 2004
7,139,408 Transform domain watermarking of image signals 83 2004
7,537,170 Machine-readable security features for printed objects 89 2004
7,305,104 Authentication of identification documents using digital watermarks 102 2004
7,515,733 Methods and arrangements employing digital content items 85 2005
7,424,131 Authentication of physical and electronic media objects using digital watermarks 98 2005
* 2005/0135,656 Authentication of physical and electronic media objects using digital watermarks 1 2005
8,108,484 Fingerprints and machine-readable codes combined with user characteristics to obtain content or information 2 2005
7,177,443 Method and apparatus for associating identifiers with content 86 2005
8,127,137 Watermark payload encryption for media including multiple watermarks 7 2005
7,876,899 Recoverable digital content degradation: method and apparatus 2 2005
* 2005/0262,162 Recoverable digital content degradation: method and apparatus 12 2005
7,321,667 Data hiding through arrangement of objects 52 2005
* 2005/0207,615 Data hiding through arrangement of objects 1 2005
7,738,673 Low visible digital watermarks 98 2005
7,587,601 Digital watermarking methods and apparatus for use with audio and video content 47 2005
8,429,205 Associating data with media signals in media signal systems through auxiliary data steganographically embedded in the media signals 1 2005
8,204,222 Steganographic encoding and decoding of auxiliary codes in media signals 11 2005
8,891,811 Hierarchical watermark detector 0 2005
* 8,005,254 Background watermark processing 5 2005
7,567,686 Hiding and detecting messages in media signals 61 2005
7,444,392 Registering with computer systems 87 2005
7,269,275 Physical objects and validation of physical objects 55 2005
7,643,649 Integrating digital watermarks in multimedia content 102 2005
7,239,734 Authentication of identification documents and banknotes 71 2005
* 7,242,790 Video steganography 57 2005
7,536,555 Methods for audio watermarking and decoding 68 2006
7,313,251 Method and system for managing and controlling electronic media 100 2006
7,330,563 Documents, articles and authentication of documents and articles 17 2006
8,095,795 Methods and apparatus for robust embedded data 6 2006
7,995,790 Digital watermark detection using predetermined color projections 6 2006
7,992,003 Methods and systems for inserting watermarks in digital signals 9 2006
7,483,547 Perceptual modeling of media signals for data hiding 5 2006
8,626,666 Confirming physical custody of objects 0 2006
7,602,940 Steganographic data hiding using a device clock 48 2006
7,602,977 Digital watermarks 49 2006
7,690,041 Associating first and second watermarks with audio or video content 5 2006
7,949,147 Watermarking compressed data 26 2006
8,250,660 Digital watermarking applications 1 2006
7,806,322 Authentication methods and systems including embedded auxiliary data 24 2006
7,930,546 Methods, systems, and sub-combinations useful in media identification 30 2007
7,991,184 Apparatus to process images and video 0 2007
7,639,837 Identification documents and authentication of such documents 53 2007
7,486,799 Methods for monitoring audio and images on the internet 115 2007
7,715,446 Wireless methods and devices employing plural-bit data derived from audio information 20 2007
7,702,511 Watermarking to convey auxiliary information, and media embodying same 50 2007
7,555,785 Method and apparatus for content management 14 2007
7,359,528 Monitoring of video or audio based on in-band and out-of-band data 76 2007
* 7,433,491 Method and apparatus for associating identifiers with content 84 2007
7,987,094 Audio encoding to convey auxiliary information, and decoding of same 2 2007
7,724,919 Methods and systems for steganographic processing 53 2007
7,349,555 Documents and apparatus to encode documents 35 2007
7,362,879 Substituting objects based on steganographic encoding 21 2007
7,427,030 Security features for objects and method regarding same 88 2007
7,676,059 Video steganography or encoding 48 2007
7,460,726 Integrating steganographic encoding in multimedia content 87 2007
7,570,784 Identification and protection of security documents 48 2007
7,415,129 Providing reports associated with video and audio content 112 2007
7,444,000 Content identification, and securing media content with steganographic encoding 90 2007
7,796,826 Digital watermarks 48 2007
7,656,930 Assessing quality of service using digital watermark information 21 2007
* 8,027,663 Wireless methods and devices employing steganography 2 2007
7,787,653 Methods for controlling rendering of images and video 92 2007
8,301,893 Detecting media areas likely of hosting watermarks 1 2007
7,555,139 Secure documents with hidden signals, and related methods and systems 64 2007
8,391,541 Steganographic encoding and detecting for video signals 1 2007
8,355,514 Audio encoding to convey auxiliary information, and media embodying same 5 2007
7,508,955 Authentication of objects using steganography 83 2007
7,724,920 Digital authentication with analog documents 21 2007
* 7,620,200 Authentication of identification documents 25 2007
7,711,143 Methods for marking images 99 2007
7,697,719 Methods for analyzing electronic media including video and audio 109 2007
7,532,741 Data hiding in media 50 2008
8,126,272 Methods combining multiple frames of image data 8 2008
8,098,882 Perceptability model applied to watermark signals 0 2008
8,023,692 Apparatus and methods to process video or audio 8 2008
7,773,770 Substituting or replacing components in media objects based on steganographic encoding 5 2008
7,756,290 Detecting embedded signals in media content using coincidence metrics 90 2008
8,606,715 Systems and methods facilitating communication with remote computers 0 2008
8,959,352 Transmarking of multimedia signals 0 2008
7,693,300 Color image or video processing 85 2008
7,672,477 Detecting hidden auxiliary code signals in media 50 2008
7,762,468 Readers to analyze security features on objects 85 2008
8,300,274 Process for marking substrates with information using a texture pattern and related substrates 0 2008
7,747,038 Method and apparatus for associating identifiers with content 86 2008
7,564,992 Content identification through deriving identifiers from video, images and audio 102 2008
7,987,245 Internet linking from audio 6 2008
7,602,978 Deriving multiple identifiers from multimedia content 94 2008
7,751,588 Error processing of steganographic message signals 90 2008
9,117,268 Out of phase digital watermarking in two chrominance directions 0 2008
7,751,596 Methods and arrangements employing digital content items 106 2009
7,822,226 Perceptual modeling of media signals for data hiding 3 2009
7,983,443 Methods for managing content using intentional degradation and insertion of steganographic codes 1 2009
8,316,239 Decoding information to allow access to computerized systems 0 2009
8,023,694 Systems and methods using identifying data derived or extracted from video, audio or images 3 2009
7,953,270 Methods and arrangements employing digital content items 33 2009
8,345,316 Layered security in digital watermarking 0 2009
7,831,062 Arrangement of objects in images or graphics to convey a machine-readable signal 43 2009
8,051,294 Methods for audio watermarking and decoding 2 2009
7,957,553 Digital watermarking apparatus and methods 20 2009
8,000,518 Methods, objects and apparatus employing machine readable data 0 2009
8,185,967 Method and apparatus for content management 5 2009
8,009,893 Security document carrying machine readable pattern 3 2009
7,970,167 Deriving identifying data from video and audio 27 2009
8,638,978 Digital watermarking of low bit rate video 0 2009
8,055,012 Hiding and detecting messages in media signals 2 2009
8,103,879 Processing audio or video content with multiple watermark layers 2 2009
* 8,073,193 Methods and systems for steganographic processing 0 2009
7,974,439 Embedding hidden auxiliary information in media 4 2009
8,036,419 Digital watermarks 3 2009
8,014,562 Signal processing of audio and video data, including deriving identifying information 2 2009
7,961,949 Extracting multiple identifiers from audio and video content 24 2009
8,051,295 Benchmarks for digital watermarking 5 2009
8,199,969 Out of phase digital watermarking in two chrominance directions 9 2009
8,509,474 Digital watermarking methods, apparatus and systems 1 2009
8,280,101 Identification documents and authentication of such documents 0 2009
8,107,674 Synchronizing rendering of multimedia content 12 2010
8,116,516 Controlling use of audio or image content 2 2010
8,130,811 Assessing quality of service using digital watermark information 0 2010
8,515,120 Steganographic encoding and decoding 2 2010
8,165,341 Methods and apparatus to process imagery or audio content 7 2010
8,095,989 Associating first and second watermarks with audio or video content 2 2010
8,165,342 Color image or video processing 3 2010
8,155,378 Color image or video processing 4 2010
8,010,632 Steganographic encoding for video and images 1 2010
8,023,695 Methods for analyzing electronic media including video and audio 4 2010
8,068,679 Audio and video signal processing 3 2010
8,170,273 Encoding and decoding auxiliary signals 0 2010
8,055,013 Conveying auxilliary data through digital watermarking 19 2010
8,369,363 Wireless methods and devices employing plural-bit data derived from audio information 0 2010
8,411,898 Digital authentication with analog documents 1 2010
8,014,563 Methods and systems for steganographic processing 0 2010
8,050,451 Electronic forms using indicia, sometimes hidden indicia 1 2010
8,027,509 Digital watermarking in data representing color channels 7 2010
8,103,053 Method and apparatus for associating identifiers with content 0 2010
8,184,849 Error processing of steganographic message signals 2 2010
8,027,510 Encoding and decoding media signals 1 2010
8,144,924 Content objects with computer instructions steganographically encoded therein, and associated methods 0 2010
8,123,134 Apparatus to analyze security features on objects 2 2010
8,150,032 Methods for controlling rendering of images and video 1 2010
8,483,426 Digital watermarks 0 2010
8,078,697 Network linking methods and apparatus 2 2010
8,213,674 Perceptual modeling of media signals for data hiding 0 2010
8,175,329 Authentication of physical and electronic media objects using digital watermarks 0 2010
8,515,121 Arrangement of objects in images or graphics to convey a machine-readable signal 0 2010
8,681,980 Recoverable digital content degradation 1 2011
8,184,851 Inserting watermarks into portions of digital signals 1 2011
8,521,850 Content containing a steganographically encoded process identifier 1 2011
8,190,713 Controlling a device based upon steganographically encoded data 2 2011
8,391,545 Signal processing of audio and video data, including assessment of embedded data 0 2011
8,644,548 Digital watermarks 0 2011
8,543,661 Fingerprints and machine-readable codes combined with user characteristics to obtain content or information 1 2011
8,763,144 Associating first and second watermarks with audio or video content 0 2012
8,792,675 Color image or video processing 0 2012
8,719,958 Method and apparatus for content management 0 2012
8,660,298 Encoding in two chrominance directions 0 2012
8,908,908 Steganographic encoding and decoding 0 2013
8,913,780 Digital watermarking methods, apparatus and systems 0 2013
8,983,120 Steganographic encoding and decoding 0 2013
8,744,120 Steganographic encoding and decoding 2 2013
 
L-1 Secure Credentialing (1)
7,963,449 Tamper evident adhesive and identification document including same 1 2010
* Cited By Examiner