Patents by Inventor Pi Sheng Chang
Pi Sheng Chang 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: 9369702Abstract: A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes encoding the position of non-zero-valued coefficients in an ordered series of quantized transform coefficients of a block of image data, including encoding events using variable length coding using a plurality of variable length code mappings that each maps events to codewords, the position encoding including switching between the code mappings based on the context. The coding method further includes encoding amplitudes of the non-zero-valued coefficients using variable dimensional amplitude coding in the reverse order of the original ordering of the series.Type: GrantFiled: February 20, 2014Date of Patent: June 14, 2016Assignee: Cisco Technology, Inc.Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Publication number: 20150253890Abstract: Asymmetric scanning logic implements asymmetric panel scanning by scanning some rows on a touch panel more frequently than other rows. Note that although an entire row at a time may be driven, if only particular pixels in the row are of interest (e.g., included in any region of interest for focused asymmetric scanning), then circuitry may power down the receivers for the columns in which the pixels exist to save power. The asymmetric scanning logic facilitates focused attention to specific areas of interest on the touch panel, to compensate, for example, for high noise or low signal strength in those areas of interest.Type: ApplicationFiled: March 25, 2015Publication date: September 10, 2015Inventors: David A. Sobel, Sumant Ranganathan, Tianhao Li, John S. Walley, Glen Weaver, Kerrynn Jacques de Roche, Pi Sheng Chang
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Publication number: 20150242021Abstract: Control circuitry for a touch panel includes a touch panel interface, a memory comprising touch positioning logic, and a controller in communication with the memory and the touch panel interface. The controller is operable, when the touch positioning logic is executed, to perform selected processing of the touch panel, including scanning a touch panel and determining a touch panel blob resulting from a touch, obtaining blob characteristics of the touch panel blob, and determining a position of the blob relative to the touch panel based on the blob characteristics. The blob characteristics can be adjusted to more accurately position the blob in circumstances where the blob is located near the edge of the touch panel, is in close proximity to another blob, or when the touch panel has variation in the received signal noise.Type: ApplicationFiled: May 14, 2015Publication date: August 27, 2015Inventors: Glen Weaver, Sumant Ranganathan, Federicao Santiago Cattivelli, Tianhao Li, Bhupesh Kharwa, Satish Vithal Joshi, Kerrynn Jacques de Roche, Pi Sheng Chang
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Patent number: 9058078Abstract: Control circuitry for a touch panel includes a touch panel interface, a memory comprising touch positioning logic, and a controller in communication with the memory and the touch panel interface. The controller is operable, when the touch positioning logic is executed, to perform selected processing of the touch panel, including scanning a touch panel and determining a touch panel blob resulting from a touch, obtaining blob characteristics of the touch panel blob, and determining a position of the blob relative to the touch panel based on the blob characteristics. The blob characteristics can be adjusted to more accurately position the blob in circumstances where the blob is located near the edge of the touch panel, is in close proximity to another blob, or when the touch panel has variation in the received signal noise.Type: GrantFiled: March 12, 2012Date of Patent: June 16, 2015Assignee: Broadcom CorporationInventors: Glen Weaver, Sumant Ranganathan, Federico Santiago Cattivelli, Tianhao Li, Bhupesh Kharwa, Satish Vithal Joshi, Kerrynn Jacques de Roche, Pi Sheng Chang
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Patent number: 9001072Abstract: Asymmetric scanning logic implements asymmetric panel scanning by scanning some rows on a touch panel more frequently than other rows. Note that although an entire row at a time may be driven, if only particular pixels in the row are of interest (e.g., included in any region of interest for focused asymmetric scanning), then circuitry may power down the receivers for the columns in which the pixels exist to save power. The asymmetric scanning logic facilitates focused attention to specific areas of interest on the touch panel, to compensate, for example, for high noise or low signal strength in those areas of interest.Type: GrantFiled: March 9, 2012Date of Patent: April 7, 2015Assignee: Broadcom CorporationInventors: David A. Sobel, Sumant Ranganathan, Tianhao Li, John S. Walley, Glen Weaver, Kerrynn Jacques de Roche, Pi Sheng Chang
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Publication number: 20140169453Abstract: A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes encoding the position of non-zero-valued coefficients in an ordered series of quantized transform coefficients of a block of image data, including encoding events using variable length coding using a plurality of variable length code mappings that each maps events to codewords, the position encoding including switching between the code mappings based on the context. The coding method further includes encoding amplitudes of the non-zero-valued coefficients using variable dimensional amplitude coding in the reverse order of the original ordering of the series.Type: ApplicationFiled: February 20, 2014Publication date: June 19, 2014Applicant: Cisco Technology Inc.Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Patent number: 8670485Abstract: A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes encoding the position of non-zero-valued coefficients in an ordered series of quantized transform coefficients of a block of image data, including encoding events using variable length coding using a plurality of variable length code mappings that each maps events to codewords, the position encoding including switching between the code mappings based on the context. The coding method further includes encoding amplitudes of the non-zero-valued coefficients using variable dimensional amplitude coding in the reverse order of the original ordering of the series.Type: GrantFiled: September 4, 2012Date of Patent: March 11, 2014Assignee: Cisco Technology, Inc.Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Patent number: 8576915Abstract: Particular embodiments include a method, an apparatus, and logic embodied in tangible computer-readable medium that when executed carries out a method of encoding an ordered sequence of quantized transform coefficients of a block of image data. One embodiment is a context adaptive variable length coding method that includes position coding the positions of zero-valued and non-zero valued coefficients by either a mixed method that encodes either the run length of zeroes preceding a non-zero coefficient or the run length of nonzero-valued coefficients preceding a zero-valued coefficients. Another includes position coding that uses a variable length code for two parameters respectively indicating the number of zero-valued coefficient positions and nonzero-valued coefficient positions still to be coded.Type: GrantFiled: March 21, 2012Date of Patent: November 5, 2013Assignee: Cisco Technology, Inc.Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Patent number: 8520965Abstract: A coding method for an ordered series of quantized transform coefficients of a block of image data, including a context adaptive position coding process to encode the position of clusters of non-zero-valued coefficients, e.g., a multidimensional position coder that uses one of a plurality of code mappings selected according to at least one criterion including at least one context-based criterion, and an amplitude encoding process to encode any amplitudes remaining to be coded, the amplitude coding using one or a plurality of amplitude code mappings selected according to at least one criterion, including a context-based criterion. A context-based selection criterion means a criterion that during encoding is known or derivable from one or more previously encoded items of information. Also a coding apparatus, a decoding apparatus, a computer readable medium configured with instructions that when executed implement a coding method, and another medium for a decoding method.Type: GrantFiled: June 13, 2012Date of Patent: August 27, 2013Assignee: Cisco Technology, Inc.Inventors: Junlin Li, Ghassan AlRegib, Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Publication number: 20130176274Abstract: Asymmetric scanning logic implements asymmetric panel scanning by scanning some rows on a touch panel more frequently than other rows. Note that although an entire row at a time may be driven, if only particular pixels in the row are of interest (e.g., included in any region of interest for focused asymmetric scanning), then circuitry may power down the receivers for the columns in which the pixels exist to save power. The asymmetric scanning logic facilitates focused attention to specific areas of interest on the touch panel, to compensate, for example, for high noise or low signal strength in those areas of interest.Type: ApplicationFiled: March 9, 2012Publication date: July 11, 2013Applicant: Broadcom CorporationInventors: David A. Sobel, Sumant Ranganathan, Tianhao Li, John S. Walley, Glen Weaver, Kerrynn Jacques de Roche, Pi Sheng Chang
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Publication number: 20130176275Abstract: Control circuitry for a touch panel includes a touch panel interface, a memory comprising touch positioning logic, and a controller in communication with the memory and the touch panel interface. The controller is operable, when the touch positioning logic is executed, to perform selected processing of the touch panel, including scanning a touch panel and determining a touch panel blob resulting from a touch, obtaining blob characteristics of the touch panel blob, and determining a position of the blob relative to the touch panel based on the blob characteristics. The blob characteristics can be adjusted to more accurately position the blob in circumstances where the blob is located near the edge of the touch panel, is in close proximity to another blob, or when the touch panel has variation in the received signal noise.Type: ApplicationFiled: March 12, 2012Publication date: July 11, 2013Applicant: Broadcom CorporationInventors: Glen Weaver, Sumant Ranganathan, Federico Santiago Cattivelli, Tianhao Li, Bhupesh Kharwa, Satish Vithal Joshi, Kerrynn Jacques De Roche, Pi Sheng Chang
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Publication number: 20130010860Abstract: A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes encoding the position of non-zero-valued coefficients in an ordered series of quantized transform coefficients of a block of image data, including encoding events using variable length coding using a plurality of variable length code mappings that each maps events to codewords, the position encoding including switching between the code mappings based on the context. The coding method further includes encoding amplitudes of the non-zero-valued coefficients using variable dimensional amplitude coding in the reverse order of the original ordering of the series.Type: ApplicationFiled: September 4, 2012Publication date: January 10, 2013Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Publication number: 20120257839Abstract: A coding method for an ordered series of quantized transform coefficients of a block of image data, including a context adaptive position coding process to encode the position of clusters of non-zero-valued coefficients, e.g., a multidimensional position coder that uses one of a plurality of code mappings selected according to at least one criterion including at least one context-based criterion, and an amplitude encoding process to encode any amplitudes remaining to be coded, the amplitude coding using one or a plurality of amplitude code mappings selected according to at least one criterion, including a context-based criterion. A context-based selection criterion means a criterion that during encoding is known or derivable from one or more previously encoded items of information. Also a coding apparatus, a decoding apparatus, a computer readable medium configured with instructions that when executed implement a coding method, and another medium for a decoding method.Type: ApplicationFiled: June 13, 2012Publication date: October 11, 2012Inventors: Junlin Li, Ghassan AlRegib, Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Patent number: 8265162Abstract: A coding method, apparatus, and medium with software encoded thereon to implement a coding method. The coding method includes encoding the position of non-zero-valued coefficients in an ordered series of quantized transform coefficients of a block of image data, including encoding events using variable length coding using a plurality of variable length code mappings that each maps events to codewords, the position encoding including switching between the code mappings based on the context. The coding method further includes encoding amplitudes of the non-zero-valued coefficients using variable dimensional amplitude coding in the reverse order of the original ordering of the series.Type: GrantFiled: January 18, 2008Date of Patent: September 11, 2012Assignee: Cisco Technology, Inc.Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Publication number: 20120189222Abstract: Particular embodiments include a method, an apparatus, and logic embodied in tangible computer-readable medium that when executed carries out a method of encoding an ordered sequence of quantized transform coefficients of a block of image data. One embodiment is a context adaptive variable length coding method that includes position coding the positions of zero-valued and non-zero valued coefficients by either a mixed method that encodes either the run length of zeroes preceding a non-zero coefficient or the run length of nonzero-valued coefficients preceding a zero-valued coefficients. Another includes position coding that uses a variable length code for two parameters respectively indicating the number of zero-valued coefficient positions and nonzero-valued coefficient positions still to be coded.Type: ApplicationFiled: March 21, 2012Publication date: July 26, 2012Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Patent number: 8204327Abstract: A coding method for an ordered series of quantized transform coefficients of a block of image data, including a context adaptive position coding process to encode the position of clusters of non-zero-valued coefficients, e.g., a multidimensional position coder that uses one of a plurality of code mappings selected according to at least one criterion including at least one context-based criterion, and an amplitude encoding process to encode any amplitudes remaining to be coded, the amplitude coding using one or a plurality of amplitude code mappings selected according to at least one criterion, including a context-based criterion. A context-based selection criterion is meant a criterion that during encoding is known or derivable from one or more previously encoded items of information. Also a coding apparatus, a decoding apparatus, a computer readable medium configured with instructions that when executed implement a coding method, and another medium for a decoding method.Type: GrantFiled: December 16, 2008Date of Patent: June 19, 2012Assignee: Cisco Technology, Inc.Inventors: Junlin Li, Ghassan AlRegib, Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Patent number: 8144784Abstract: Particular embodiments include a method, an apparatus, and logic embodied in tangible computer-readable medium that when executed carries out a method of encoding an ordered sequence of quantized transform coefficients of a block of image data. One embodiment is a context adaptive variable length coding method that includes position coding the positions of zero-valued and non-zero valued coefficients by either a mixed method that encodes either the run length of zeroes preceding a non-zero coefficient or the run length of nonzero-valued coefficients preceding a zero-valued coefficients. Another includes position coding that uses a variable length code for two parameters respectively indicating the number of zero-valued coefficient positions and nonzero-valued coefficient positions still to be coded.Type: GrantFiled: July 9, 2007Date of Patent: March 27, 2012Assignee: Cisco Technology, Inc.Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang
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Patent number: 8135071Abstract: A method, and apparatus, and logic encoded in one or more computer-readable tangible medium to carry out a method. The method is to code an ordered sequence of quantized transform coefficients of a block of image data using a hybrid coding method that includes determining a breakpoint location in the sequence between a low-frequency region and a high-frequency region; coding the low-frequency region using a selected low-frequency variable length coding method; coding the high-frequency region using a selected high-frequency variable length coding method; and coding the location of the breakpoint. The breakpoint location is determined as a function of properties of neighboring blocks such that little if any information needs to be sent to a decoder about the breakpoint of a block or multi-block partition, and the decoder can use the properties of neighboring blocks to determine the breakpoint used to code a to-be-decoded sequence or sequences of a block or a multi-block partition.Type: GrantFiled: March 15, 2007Date of Patent: March 13, 2012Assignee: Cisco Technology, Inc.Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang, John A. Toebes
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Patent number: 8126062Abstract: A method, and apparatus, and logic encoded in one or more computer-readable tangible medium to carry out a method. The method is to code a plurality of ordered sequences of quantized transform coefficients of a corresponding plurality of blocks of image data using a hybrid coding method that includes determining a breakpoint location in the sequence between a low frequency region and a high frequency region; coding the low-frequency region using a selected low-frequency variable length coding method; coding the high-frequency region using a selected high-frequency variable length coding method; and coding the location of the breakpoint. The plurality of blocks include adjacent blocks and form a multi-block partition. The breakpoint location is determined as a function of the sequences of the multi-block partition such that different multi-block partitions can have different breakpoints.Type: GrantFiled: March 15, 2007Date of Patent: February 28, 2012Assignee: Cisco Technology, Inc.Inventors: Dihong Tian, Wen-hsiung Chen, Pi Sheng Chang, John A. Toebes
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Patent number: 8121427Abstract: A method, and apparatus, and logic encoded in one or more computer-readable tangible medium to carry out a method of determining a breakpoint position in an ordered sequence of quantized transform coefficients of a block of image data for a hybrid variable length coding the ordered sequence. The breakpoint location in the sequence is between a low-frequency region and a high-frequency region. The hybrid variable length coding method includes coding the low-frequency region using a selected low-frequency variable length coding method; coding the high-frequency region using a selected high-frequency variable length coding method; and coding the position in the sequence of the breakpoint. The breakpoint location is determining uses a relatively simple and fast method based on pre-defined cost criteria. A method is included that instead of coding the breakpoint separately, codes the breakpoint jointly with coefficient events.Type: GrantFiled: December 20, 2007Date of Patent: February 21, 2012Assignee: Cisco Technology, Inc.Inventors: Dihong Tian, Pi Sheng Chang, Wen-hsiung Chen