Patents by Inventor Dekun Zou
Dekun Zou has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9565415Abstract: Visual discomfort from depth jumps in 3D video content is reduced or avoided by detecting the occurrence of a depth jump and by changing the disparity of a group of received image frames including the frames at the depth jump in order to adjust the perceived depth in a smooth transition across the group of image frames from a first disparity value to a second disparity value. Depth jumps may be detected, for instance, when content is switched from one 3D shot to another 3D shot.Type: GrantFiled: September 13, 2011Date of Patent: February 7, 2017Assignee: THOMSON LICENSINGInventors: Tao Zhang, Shan He, Dekun Zou
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Patent number: 9299120Abstract: Implementations may relate to various aspects of modifying, or using, a coded bitstream, or to recovering watermarking information from data. In one implementation, a coded bitstream is modified to allow for the application of a watermark to the coded bitstream without changing the coding of any other syntax elements in the bitstream. This is performed by identifying conditions necessary to change a coded syntax element without disrupting the interpretation of subsequent coded elements. The coded syntax element is replaced with another coded value if the modified value generates the same decoding variables as the original value would have generated. Particular implementations focus on syntax elements coded using entropy coding, including, for example, Context-based Adaptive Binary Arithmetic Coding (CABAC). Regardless of the type of coding or watermarking, various implementations may provide for recovering watermarking information.Type: GrantFiled: November 2, 2007Date of Patent: March 29, 2016Assignee: Thomson Licensing LLCInventors: Dekun Zou, Jeffrey Adam Bloom, Peng Yin, Oscar Divorra Escoda
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Patent number: 9124771Abstract: A security method for H.264 video streams and the like is provided that comprises: coding video data with incorrect or missing bytes, whereby the coded video is corrupted or distorted; generating replacement data that corrects the coded video during decoding; and distributing the replacement data to users.Type: GrantFiled: January 28, 2011Date of Patent: September 1, 2015Assignee: THOMSON LICENSINGInventors: Dekun Zou, Wenjun Lu
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Patent number: 9113231Abstract: A method comprises accessing encoded video data; accessing a list of watermarks to the encoded video data; determining syntax elements for current blocks of video data and syntax elements of currents blocks with the watermarks; removing watermarks that cause visible artifacts based on differences in the syntax elements between the current blocks and current blocks with watermarks, thereby creating filtered list of acceptable watermarks. The method can further include determining coding variable ranges for the current block and current block with watermarks from the list; comparing the coding variable ranges for the current blocks and current blocks with watermarks from the list; and filtering out watermarks that yield coding variable ranges outside the coding variable ranges of the current blocks.Type: GrantFiled: August 17, 2009Date of Patent: August 18, 2015Assignee: Thomson LicensingInventors: Dekun Zou, Jeffrey Adam Bloom, Shan He
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Patent number: 9105091Abstract: A method for detecting and selecting watermarking in video coding is provided that comprises accessing a list of possible watermarks; generating propagation maps of modifications to the video that would be caused by applying the respective watermarks; generating a detection region responsive to each respective propagation map that includes blocks within the propagation map that collectively rank highest with respect to a selected detection criteria compared to each other region within the propagation map; selecting a threshold metric for evaluating detection regions; and removing watermarks from the list responsive to a comparison of their detection regions with the threshold metric.Type: GrantFiled: February 7, 2011Date of Patent: August 11, 2015Assignee: THOMSON LICENSINGInventors: Shan He, Dekun Zou, Jeffrey Adam Bloom
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Patent number: 9055179Abstract: Systems and methods of measuring a temporal offset between audio content and video content that employ audio fingerprints from an audio signal in the audio content, and video fingerprints from video frames in the video content. The systems obtain reference audio and video fingerprints prior to transmission of video over a media channel, and obtain target audio and video fingerprints subsequent to transmission of the video over the media channel. Each fingerprint has an associated time stamp. Using the reference and target audio fingerprints and their associated time stamps, the systems determine an audio time stamp offset. Using the reference and target video fingerprints and their associated time stamps, the systems determine a video time stamp offset. Using the audio and video time stamp offsets, the systems determine a temporal offset between the video content and the audio content introduced by the media channel.Type: GrantFiled: March 13, 2014Date of Patent: June 9, 2015Assignee: Dialogic CorporationInventors: Jeffrey A. Bloom, Dekun Zou, Ran Ding
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Patent number: 9042455Abstract: A method comprises receiving original encoded video stream as one input, accessing encoded data divided into slices which are further divided into blocks, receiving the list of possible changes or watermarks as another input, accessing at least one block, decoding each slice, setting down each slice, extracting from the list those changes that apply to the at least one block, and constructing propagation maps from inter-prediction or intra-prediction using changes for the at least one block. The method can further comprise decoding luminance data using the propagation maps, comparing the luminance data to a fidelity threshold, and applying possible changes or watermarks to those not exceeding the fidelity threshold.Type: GrantFiled: August 19, 2009Date of Patent: May 26, 2015Assignee: Thomson LicensingInventors: Shan He, Jeffrey Adam Bloom, Dekun Zou
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Patent number: 8948443Abstract: A method comprises providing a change to apply to video; dividing video into blocks; creating propagation map which captures only specific changes to blocks that would be changed by the application of the change; evaluating the change based on a luminance criterion as being a perceptible change or an imperceptible change; for propagation maps of an imperceptible change, storing the propagation map to a list, wherein the propagation map is the principle data structure to be applied to the video. The propagation map can be created by using motion vector changes associated with the change.Type: GrantFiled: August 18, 2009Date of Patent: February 3, 2015Assignee: Thomson LicensingInventors: Shan He, Jeffrey Adam Bloom, Dekun Zou
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Patent number: 8885050Abstract: Systems and methods of perceptual quality monitoring of video information, communications, and entertainment that can estimate the perceptual quality of video with high accuracy, and can be used to produce quality scores that better correlate with subjective quality scores of an end user. The systems and methods of perceptual quality monitoring of video can generate, from an encoded input video bitstream, estimates of one or more quality parameters relating to the video, such as the coding bit rate parameter, the video frame rate parameter, and the packet loss rate parameter, and provide these video quality parameter estimates to a predetermined video quality estimation model. Because the estimates of the video quality parameters are generated from the encoded input video bitstream as it is being received, the systems and methods are suitable for use as QoE monitoring tools.Type: GrantFiled: February 11, 2011Date of Patent: November 11, 2014Assignee: Dialogic (US) Inc.Inventors: Beibei Wang, Dekun Zou, Ran Ding, Tao Liu, Sitaram Bhagavathy, Niranjan Narvekar, Jeffrey A. Bloom, Glenn L. Cash
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Patent number: 8824727Abstract: A method comprises accessing changes which can be watermarks in a list for coded data, the changes having an syntax element, an original value and an candidate alternative value; determining for a subset a group of compliant changes from the changes, the complaint changes being compliant with a coding protocol such as a CABAC encoding protocol; and selecting for the subset only compliant changes that result in the subset having only one candidate alternative value for each syntax elements and result in only compliant changes also meeting at least one performance criterion. The method can include determining fidelity, recoverability, or robustness of the watermarks and removing or preventing watermarks from being in the subset based on the fidelity, recoverability, or robustness, wherein fidelity, recoverability, and robustness are performance criteria.Type: GrantFiled: August 18, 2009Date of Patent: September 2, 2014Assignee: Thomson LicensingInventors: Dekun Zou, Jeffrey Adam Bloom, Shan He
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Patent number: 8804815Abstract: Systems and methods of objective video quality measurement based on support vector machines. The video quality measurement systems can obtain information pertaining to features of a target training video, obtain corresponding information pertaining to features of a reference version of the target training video, and employ the target training features and/or the reference training features to build video quality models using such support vector machines. Based on the target training features and/or the reference training features used to build such video quality models, the video quality models can be made to conform more closely to the human visual system. Moreover, using such video quality models in conjunction with target features of a target video whose perceptual quality is to be measured, and/or reference features of a reference video, the video quality measurement systems can be employed to predict measurements of the perceptual quality of such a target video with increased accuracy.Type: GrantFiled: July 29, 2011Date of Patent: August 12, 2014Assignee: Dialogic (US) Inc.Inventors: Dekun Zou, Beibei Wang
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Patent number: 8805827Abstract: Systems and methods of identifying media content, such as video content, that employ fingerprint matching at the level of video frames. The presently disclosed systems and methods of identifying media content can extract one or more fingerprints from a plurality of video frames included in query video content, and, for each of the plurality of video frames from the query video content, perform frame-level fingerprint matching of the extracted fingerprints against fingerprints extracted from video frames included in a plurality of reference video content. Using the results of such frame-level fingerprint matching, the presently disclosed systems and methods of identifying media content can identify the query content in relation to an overall sequence of video frames from at least one of the plurality of reference content, and/or in relation to respective video frames included in a sequence of video frames from the reference content.Type: GrantFiled: August 23, 2011Date of Patent: August 12, 2014Assignee: Dialogic (US) Inc.Inventors: Sitaram Bhagavathy, Jeffrey A. Bloom, Dekun Zou, Wen Chen
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Publication number: 20140192263Abstract: Systems and methods of measuring a temporal offset between audio content and video content that employ audio fingerprints from an audio signal in the audio content, and video fingerprints from video frames in the video content. The systems obtain reference audio and video fingerprints prior to transmission of video over a media channel, and obtain target audio and video fingerprints subsequent to transmission of the video over the media channel. Each fingerprint has an associated time stamp. Using the reference and target audio fingerprints and their associated time stamps, the systems determine an audio time stamp offset. Using the reference and target video fingerprints and their associated time stamps, the systems determine a video time stamp offset. Using the audio and video time stamp offsets, the systems determine a temporal offset between the video content and the audio content introduced by the media channel.Type: ApplicationFiled: March 13, 2014Publication date: July 10, 2014Inventors: Jeffrey A. Bloom, Dekun Zou, Ran Ding
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Patent number: 8761541Abstract: Noise, either in the form of comfort noise or film grain, is added to a three dimensional image in accordance with image depth information to reduce human sensitivity to coding artifacts, thereby improving subjective image quality.Type: GrantFiled: May 11, 2010Date of Patent: June 24, 2014Assignee: Thomson NlicensingInventors: Dong Tian, Dekun Zou
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Patent number: 8717499Abstract: Systems and methods of measuring a temporal offset between audio content and video content that employ audio fingerprints from an audio signal in the audio content, and video fingerprints from video frames in the video content. The systems obtain reference audio and video fingerprints prior to transmission of video over a media channel, and obtain target audio and video fingerprints subsequent to transmission of the video over the media channel. Each fingerprint has an associated time stamp. Using the reference and target audio fingerprints and their associated time stamps, the systems determine an audio time stamp offset. Using the reference and target video fingerprints and their associated time stamps, the systems determine a video time stamp offset. Using the audio and video time stamp offsets, the systems determine a temporal offset between the video content and the audio content introduced by the media channel.Type: GrantFiled: September 2, 2011Date of Patent: May 6, 2014Assignee: Dialogic CorporationInventors: Jeffrey A. Bloom, Dekun Zou, Ran Ding
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Patent number: 8594366Abstract: A method of providing CABAC compliant changes such as watermarks comprises accessing encoded data such as video which comprise at least two blocks; creating or accessing a list of changes to the encoded data that include a direct change to a block; determining motion character or motion vector differential of non-immediate block, non-immediate blocks being adjacent to an immediate block that are immediately adjacent to the block; determining change to the immediate block based on original motion character of the block and the non-immediate block and the motion character of the block that would result from the application of the change; storing the change to the list if the change does not cause a difference to the immediate block; and evaluating other potential changes if other potential changes are available, wherein the other potential changes are subjected to the same process steps as the direct change.Type: GrantFiled: August 17, 2009Date of Patent: November 26, 2013Assignee: Thomson LicensingInventors: Dekun Zou, Jeffrey Adam Bloom, Shan He
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Patent number: 8588459Abstract: Various implementations are provided for, for example, determining watermarking data, performing the watermarking, and processing watermarked data. At least one implementation watermarks AVC bitstream that uses CAVLC entropy coding. The watermarking data may be determined in a pre-processing stage and stored for later use in watermark a bitstream. One method accesses variable-length encoded data including an encoding of information identifying an actual reference used to predictively encode an image. The encoding of the information has a particular value. The method determines an alternative value that is different from the particular value, such that the alternative value is an encoding of alternative information that identifies a different reference from the actual reference. The alternative value is for use in watermarking the variable-length encoded data.Type: GrantFiled: June 13, 2008Date of Patent: November 19, 2013Assignee: Thomson LicensingInventors: Jeffrey Adam Bloom, Dekun Zou
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Patent number: 8520075Abstract: Systems and methods of objective video quality measurement that employ a reduced-reference approach to video quality measurement. Such systems and methods of objective video quality measurement can extract information pertaining to one or more features of a target video whose perceptual quality is to be measured, extract information pertaining to one or more features of a reference video, and employ one or more prediction functions involving the target features and the reference features to provide a measurement of the perceptual quality of the target video.Type: GrantFiled: June 2, 2011Date of Patent: August 27, 2013Assignee: Dialogic Inc.Inventors: Sitaram Bhagavathy, Jeffrey A Bloom, Dekun Zou, Ran Ding, Beibei Wang, Tao Liu, Niranjan Narvekar
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Publication number: 20130162641Abstract: Visual discomfort from depth jumps in 3D video content is reduced or avoided by detecting the occurrence of a depth jump and by Input video changing the disparity of a group of received image frames including the frames at the depth jump in order to adjust the perceived depth in a smooth transition across the group of image frames from a first disparity value to a second disparity value. Depth jumps may be detected, for instance, when content is switched from one 3D shot to another 3D shot.Type: ApplicationFiled: September 13, 2011Publication date: June 27, 2013Applicant: Thomson LicensingInventors: Tao Zhang, Shan He, Dekun Zou
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Publication number: 20130057761Abstract: Systems and methods of measuring a temporal offset between audio content and video content that employ audio fingerprints from an audio signal in the audio content, and video fingerprints from video frames in the video content. The systems obtain reference audio and video fingerprints prior to transmission of video over a media channel, and obtain target audio and video fingerprints subsequent to transmission of the video over the media channel. Each fingerprint has an associated time stamp. Using the reference and target audio fingerprints and their associated time stamps, the systems determine an audio time stamp offset. Using the reference and target video fingerprints and their associated time stamps, the systems determine a video time stamp offset. Using the audio and video time stamp offsets, the systems determine a temporal offset between the video content and the audio content introduced by the media channel.Type: ApplicationFiled: September 2, 2011Publication date: March 7, 2013Inventors: Jeffrey A. Bloom, Dekun Zou, Ran Ding