Patents by Inventor Dov Rosenfeld
Dov Rosenfeld 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: 8494295Abstract: Disclosed are apparatuses, computer readable storage media with instructions that carry out methods, and methods of (a) coding quantized transform coefficients as occur in image compression to form codewords, and (b) decoding a bitstream comprising the codewords. The coding combines a position identifying method to identify the relative position of clusters of consecutive non-zero-valued quantized transform coefficients, an amplitude event identifying method to identify amplitude events in the clusters of non-zero-valued quantized transform coefficients, and a coding method to code the position events, amplitude events, and signs of the amplitudes in the clusters. The coding method is particularly applicable to an ordered series of quantized transform coefficients where clusters are likely-to-occur.Type: GrantFiled: February 16, 2012Date of Patent: July 23, 2013Assignee: Cisco Technology, Inc.Inventors: Wen-hsiung Chen, Fang Wu, John A. Toebes, Dov Rosenfeld, Gregory D. Pelton
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Publication number: 20120148171Abstract: Coding quantized transform coefficients as occur in image compression to form codewords, and decoding a bitstream comprising the codewords. The coding combines a position identifying method to identify the relative position of clusters of consecutive non-zero-valued quantized transform coefficients, an amplitude event identifying method to identify amplitude events in the clusters of non-zero-valued quantized transform coefficients, and a coding method to code the position events, amplitude events, and signs of the amplitudes in the clusters. The coding method is particularly applicable to an ordered series of quantized transform coefficients where clusters are likely-to-occur.Type: ApplicationFiled: February 16, 2012Publication date: June 14, 2012Inventors: Wen-hsiung Chen, Fang Wu, John A. Toebes, Dov Rosenfeld, Gregory D. Pelton
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Patent number: 8131096Abstract: Coding quantized transform coefficients as occur in image compression combines a position identifying method to identify the relative position of clusters of consecutive non-zero-valued coefficients, an amplitude event identifying method to identify amplitude events in the clusters of non-zero-valued coefficients, and a coding method to code the position events, amplitude events, and signs of the amplitudes in the clusters. The method is particularly applicable to a series of quantized transform coefficients where clusters are likely-to-occur.Type: GrantFiled: March 5, 2011Date of Patent: March 6, 2012Assignee: Cisco Technology, Inc.Inventors: Wen-hsiung Chen, Fang Wu, John A. Toebes, Dov Rosenfeld, Gregory D. Pelton
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Publication number: 20110150352Abstract: Coding quantized transform coefficients as occur in image compression combines a position identifying method to identify the relative position of clusters of consecutive non-zero-valued coefficients, an amplitude event identifying method to identify amplitude events in the clusters of non-zero-valued coefficients, and a coding method to code the position events, amplitude events, and signs of the amplitudes in the clusters. The method is particularly applicable to a series of quantized transform coefficients where clusters are likely-to-occur.Type: ApplicationFiled: March 5, 2011Publication date: June 23, 2011Inventors: Wen-hsiung Chen, Fang Wu, John A. Toebes, Dov Rosenfeld, Gregory D. Pelton
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Patent number: 7912306Abstract: Coding quantized transform coefficients as occur in image compression combines a position identifying method to identify the relative position of clusters of consecutive non-zero-valued coefficients, an amplitude event identifying method to identify amplitude events in the clusters of non-zero-valued coefficients, and a coding method to code the position events, amplitude events, and signs of the amplitudes in the clusters. The method is particularly applicable to a series of quantized transform coefficients where clusters are likely to occur.Type: GrantFiled: November 25, 2009Date of Patent: March 22, 2011Assignee: Cisco Technology, Inc.Inventors: Wen-hsiung Chen, Fang Wu, John A. Toebes, Dov Rosenfeld, Gregory D. Pelton
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Patent number: 7796825Abstract: For data compressed using the first compression method that includes codewords generated by variable length coding sets of quantized transform coefficients using a first variable length coding method, decoding the codewords to create ordered sets of quantized transform coefficients, each created set forming an ordered series of quantized transform coefficients, and re-encoding the created ordered sets of quantized transform coefficients using a second variable length coding method to produce a re-coded set of codewords. The second variable length coding method produces shorter codewords, on average, than the first variable length coding method. The decoding and re-encoding is a lossless process such that no additional quantization or other errors are introduced to the received data by the method.Type: GrantFiled: February 16, 2007Date of Patent: September 14, 2010Assignee: Cisco Technology, Inc.Inventors: Wen-hsiung Chen, Dov Rosenfeld
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Publication number: 20100067814Abstract: Coding quantized transform coefficients as occur in image compression combines a position identifying method to identify the relative position of clusters of consecutive non-zero-valued coefficients, an amplitude event identifying method to identify amplitude events in the clusters of non-zero-valued coefficients, and a coding method to code the position events, amplitude events, and signs of the amplitudes in the clusters. The method is particularly applicable to a series of quantized transform coefficients where clusters are likely to occur.Type: ApplicationFiled: November 25, 2009Publication date: March 18, 2010Inventors: Wen-hsiung Chen, Fang Wu, John A. Toebes, Dov Rosenfeld, Gregory D. Pelton
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Patent number: 7680349Abstract: Coding quantized transform coefficients as occur in image compression combines a position identifying method to identify the relative position of clusters of consecutive non-zero-valued coefficients, an amplitude event identifying method to identify amplitude events in the clusters of non-zero-valued coefficients, and a coding method to code the position events, amplitude events, and signs of the amplitudes in the clusters. The method is particularly applicable to a series of quantized transform coefficients where clusters are likely to occur.Type: GrantFiled: March 20, 2006Date of Patent: March 16, 2010Assignee: Cisco Technology, Inc.Inventors: Wen-hsiung Chen, Fang Wu, John A. Toebes, Dov Rosenfeld, Gregory D. Pelton
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Patent number: 7471840Abstract: A method, apparatus, and carrier medium to encode a series of quantized transform coefficients. The method includes identifying events that each includes a run of zero-valued coefficients preceding a run of one or more non-zero-valued coefficients, and for each such event, jointly encoding the run lengths of the preceding run of zero-valued coefficients and the following run of non-zero-valued coefficients with a codeword, such that for at least some events, relatively more likely-to-occur pairs of runlengths are encoded by a shorter codeword than relatively less likely-to-occur runlengths. The method further includes encoding each amplitude in the run of consecutive non-zero-valued coefficients, and encoding the signs of such coefficients. The method is applicable to encoding a region in the series where there is likely to be a cluster of non-zero-valued coefficients.Type: GrantFiled: August 18, 2004Date of Patent: December 30, 2008Assignee: Cisco Technology, Inc.Inventors: John A. Toebes, Wen-hsiung Chen, Fang Wu, Dov Rosenfeld
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Publication number: 20080199088Abstract: For data compressed using the first compression method that includes codewords generated by variable length coding sets of quantized transform coefficients using a first variable length coding method, decoding the codewords to create ordered sets of quantized transform coefficients, each created set forming an ordered series of quantized transform coefficients, and re-encoding the created ordered sets of quantized transform coefficients using a second variable length coding method to produce a re-coded set of codewords. The second variable length coding method produces shorter codewords, on average, than the first variable length coding method. The decoding and re-encoding is a lossless process such that no additional quantization or other errors are introduced to the received data by the method.Type: ApplicationFiled: February 16, 2007Publication date: August 21, 2008Inventors: Wen-hsiung Chen, Dov Rosenfeld
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Publication number: 20070019877Abstract: Coding quantized transform coefficients as occur in image compression combines a position identifying method to identify the relative position of clusters of consecutive non-zero-valued coefficients, an amplitude event identifying method to identify amplitude events in the clusters of non-zero-valued coefficients, and a coding method to code the position events, amplitude events, and signs of the amplitudes in the clusters. The method is particularly applicable to a series of quantized transform coefficients where clusters are likely to occur.Type: ApplicationFiled: March 20, 2006Publication date: January 25, 2007Inventors: Wen-hsiung Chen, Fang Wu, John Toebes, Dov Rosenfeld, Gregory Pelton
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Publication number: 20060039621Abstract: A method, apparatus, and carrier medium to encode a series of quantized transform coefficients. The method includes identifying events that each includes a run of zero-valued coefficients preceding a run of one or more non-zero-valued coefficients, and for each such event, jointly encoding the run lengths of the preceding run of zero-valued coefficients and the following run of non-zero-valued coefficients with a codeword, such that for at least some events, relatively more likely-to-occur pairs of runlengths are encoded by a shorter codeword than relatively less likely-to-occur runlengths. The method further includes encoding each amplitude in the run of consecutive non-zero-valued coefficients, and encoding the signs of such coefficients. The method is applicable to encoding a region in the series where there is likely to be a cluster of non-zero-valued coefficients.Type: ApplicationFiled: August 18, 2004Publication date: February 23, 2006Inventors: John Toebes, Wen-hsiung Chen, Fang Wu, Dov Rosenfeld
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Patent number: 6690747Abstract: A method for generating a reference signal from a modulated signal transmitted to a communications station that includes an array of antenna elements and spatial processing means including: separating from the signals received at the antenna elements a copy signal corresponding to the signal transmitted by a particular remote station using an initial spatial weight vector corresponding to the particular remote station; determining from the terminal copy signal a reference signal having substantially the same frequency offset and time alignment as the received antenna signals; and computing a new spatial weight vector by optimizing a cost function, the cost function using the received antenna signals and the reference signal. For demodulation, the method further includes extracting the symbols of the modulated signal.Type: GrantFiled: June 6, 2001Date of Patent: February 10, 2004Assignee: ArrayComm, Inc.Inventors: Paul Petrus, Alain M. Chiodini, Mitchell D Trott, David M. Parish, Michael Youssefmir, Dov Rosenfeld
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Publication number: 20010031022Abstract: A method for generating a reference signal from a modulated signal transmitted to a communications station that includes an array of antenna elements and spatial processing means including: separating from the signals received at the antenna elements a copy signal corresponding to the signal transmitted by a particular remote station using an initial spatial weight vector corresponding to the particular remote station; determining from the terminal copy signal a reference signal having substantially the same frequency offset and time alignment as the received antenna signals; and computing a new spatial weight vector by optimizing a cost function, the cost function using the received antenna signals and the reference signal. For demodulation, the method further includes extracting the symbols of the modulated signal.Type: ApplicationFiled: June 6, 2001Publication date: October 18, 2001Inventors: Paul Petrus, Alain M. Chiodini, Mitchell D. Trott, David M. Parish, Michael Youssefmir, Dov Rosenfeld
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Patent number: 6275543Abstract: A method for generating a reference signal from a modulated signal transmitted to a communications station that includes an array of antenna elements and spatial processing means including: separating from the signals received at the antenna elements a copy signal corresponding to the signal transmitted by a particular remote station using an initial spatial weight vector corresponding to the particular remote station; determining from the terminal copy signal a reference signal having substantially the same frequency offset and time alignment as the received antenna signals; and computing a new spatial weight vector by optimizing a cost function, the cost function using the received antenna signals and the reference signal. For demodulation, the method further includes extracting the symbols of the modulated signal.Type: GrantFiled: September 15, 1998Date of Patent: August 14, 2001Assignee: ArrayComm, Inc.Inventors: Paul Petrus, Alain M. Chiodini, Mitchell D. Trott, David M. Parish, Michael Youssefmir, Dov Rosenfeld
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Patent number: 6204875Abstract: A method and system for exposing a light sensitive material using device for forming a row of spots of light onto the light sensitive material located on a focal plane, device for modulating each of the spots according to imaging data so that at any point of time, the row of spots forms a data pattern according to the imaging data, device for generating relative motion between the imaging mechanism and the light sensitive material on the focal plane, the direction of motion substantially parallel to the direction of the row of spots on the light sensitive material; and data synchronizing device for shifting the imaging data into the modulating device at a rate determined by the speed of relative motion to maintain the image of any data pattern substantially stationary on the light sensitive material.Type: GrantFiled: October 7, 1998Date of Patent: March 20, 2001Assignee: Barco Graphics, NVInventors: Ronny A. De Loor, Dov Rosenfeld
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Patent number: 4165462Abstract: A gamma-ray source distribution in the body is imaged onto a detector using an array of apertures. The transmission of each aperture is modulated using a code such that the individual views of the source through each aperture can be decoded and separated. The codes are chosen to maximize the signal to noise ratio for each source distribution. These codes determine the photon collection efficiency of the aperture array. Planar arrays are used for volumetric reconstructions and circular arrays for cross-sectional reconstructions.Type: GrantFiled: May 5, 1977Date of Patent: August 21, 1979Inventors: Albert Macovski, Dov Rosenfeld