Patents by Inventor Kanji Mihara

Kanji Mihara 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).

  • Patent number: 8982946
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: March 17, 2015
    Assignee: Sony Corporation
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Patent number: 8948251
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: February 3, 2015
    Assignee: Sony Corporation
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Patent number: 8938000
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: January 20, 2015
    Assignee: Sony Corporation
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Patent number: 8934536
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: January 13, 2015
    Assignee: Sony Corporation
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Patent number: 8687690
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: April 1, 2014
    Assignee: Sony Corporation
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Patent number: 8638849
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: January 28, 2014
    Assignee: Sony Corporation
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Publication number: 20110080943
    Abstract: A video data compression apparatus with which compressed video data of suitable amounts of data can be produced and the time required for processing is short. The apparatus approximates a real difficulty data Dj indicating the difficulty of the pattern of each picture by the ME residual, flatness, and intra AC and further calculates the target amount of data Tj of the compressed video data from the approximated real difficulty data Dj. An encoder performs compression and coding so that the amount of data of the compressed video data becomes substantially the target amount of data Tj.
    Type: Application
    Filed: December 14, 2010
    Publication date: April 7, 2011
    Inventors: Kanji MIHARA, Takuya Kitamura, Takao Suzuki
  • Patent number: 7881373
    Abstract: A video data compression apparatus with which compressed video data of suitable amounts of data can be produced and the time required for processing is short. The apparatus approximates a real difficulty data Dj indicating the difficulty of the pattern of each picture by the ME residual, flatness, and intra AC and further calculates the target amount of data Tj of the compressed video data from the approximated real difficulty data Dj. An encoder performs compression and coding so that the amount of data of the compressed video data becomes substantially the target amount of data Tj.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: February 1, 2011
    Assignee: Sony Corporation
    Inventors: Kanji Mihara, Takuya Kitamura, Takao Suzuki
  • Patent number: 7469007
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Grant
    Filed: January 14, 2003
    Date of Patent: December 23, 2008
    Assignee: Sony Corporation
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Patent number: 7460597
    Abstract: An encoding apparatus and method prevents image deterioration generated by repeatedly performing encoding and decoding by using a quantization matrix for quantization which is different from a quantization matrix for inverse quantization. In the encoding apparatus, a matrix selector selects a first quantization matrix in accordance with the complexity of an encoded picture pattern, and supplies a quantizer with information on the selected first quantization matrix. A matrix unit rewrites, by information on a second quantization matrix, the information described in an encoded stream output from a variable length code unit so that a quantization matrix to be used for inverse quantization is a second quantization matrix different from the first quantization matrix.
    Type: Grant
    Filed: March 10, 2005
    Date of Patent: December 2, 2008
    Assignee: Sony Corporation
    Inventor: Kanji Mihara
  • Publication number: 20080232464
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Application
    Filed: July 17, 2007
    Publication date: September 25, 2008
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Publication number: 20080013625
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Application
    Filed: July 17, 2007
    Publication date: January 17, 2008
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Publication number: 20080013626
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Application
    Filed: July 17, 2007
    Publication date: January 17, 2008
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Publication number: 20080013627
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Application
    Filed: July 17, 2007
    Publication date: January 17, 2008
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Publication number: 20080008237
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Application
    Filed: July 17, 2007
    Publication date: January 10, 2008
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Patent number: 7313184
    Abstract: When repeatedly performing compression and encoding of video data, automatically detecting a previous picture type at an encoder side and performing the compression and encoding by matching GOP phases. A motion compensation unit 240 to a DCT unit 244 perform motion compensation, DCT, etc. on input video data to generate DCT coefficients. A back search unit 248 detects whether or not there is a relative minimum in the sum of remainders of the results of division by the quantization steps of the DCT coefficients, judges that the picture having the relative minimum has been compressed and encoded to an intra-picture in the previous compression and encoding, and judges the structure of the GOPs (a number N of pictures and an interval M of P pictures) at the previous compression and encoding.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: December 25, 2007
    Assignee: Sony Corporation
    Inventor: Kanji Mihara
  • Publication number: 20070263719
    Abstract: The present invention provides a transcoder having a MPEG decoder and a MPEG encoder, for changing a GOP structure and the bit rate of an encoded bitstream obtained as a result of an encoding process. The MPEG encoder receives a past encoding parameters generated at a past encoding process as a history information, and performs a present encoding process by using the past encoding parameters selectively so that the present encoding process is optimized. Furthermore, the encoder describe the past encoding parameters into the encoded bitstream as the history information so as to reuse the history information in advance encoding process. The picture quality of the video data does not deteriorate even if decoding and encoding processes are carried out repeatedly by the transcoder.
    Type: Application
    Filed: July 17, 2007
    Publication date: November 15, 2007
    Inventors: Katsumi Tahara, Yoshihiro Murakami, Takuya Kitamura, Kanji Mihara
  • Patent number: 7154949
    Abstract: In a quantizing circuit 15, DCT coefficients output from a DCT circuit 14 are quantized with the quantizing step corresponding to a quantizing index supplied from a quantizing index determining circuit 25. In the quantizing index determining circuit 25, the quantizing index is determined on the basis of a first variable corresponding to an occurrence code amount as a data accumulative amount of a buffer 17 and a second variable corresponding to the activity of macroblocks output from an activity detection circuit 24. In this case, the quantizing index determining circuit 25 adaptively sets a fixing mode for fixing the first variable or a variable mode for making variable the first variable.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: December 26, 2006
    Assignee: Sony Corporation
    Inventor: Kanji Mihara
  • Patent number: 7050495
    Abstract: In the video data compression apparatus 1, the host computer 20 controls the operation of the constituent parts of the video data compression apparatus 1. Further, the host computer 20 receives the amount of data of the compressed video data generated by preliminarily compressing and coding the noncompressed video data VIN by the encoder 162 of the simplified two pass processing unit 16, the value of the direct current component (DC component) of the video data after the DCT processing, and the power value of the alternating current component (AC component) via a control signal C16 and calculates the difficulty of the pattern of the compressed video data based on these received values. Further, the host computer 20 allocates the target amount of data Tj of the compressed video data generated by the encoder 18 via the control signal C18 for every picture based on the calculated difficulty, sets the same in the quantization circuit 168 (FIG.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: May 23, 2006
    Assignee: Sony Corporation
    Inventors: Kanji Mihara, Takuya Kitamura, Takao Suzuki
  • Patent number: 7035334
    Abstract: The present invention employs a statistical multiplexing method to enable suitable assignment of a target code rate to each program data. A controller (3) acquires encoding difficulty (Di) of each program from each of image encoders (2i). In accordance with an equation for transforming the encoding difficulty (Di) into a bit rate, the controller (3) calculates a temporary bit rate (Tmp_Ratei). Moreover, the controller (3) causes the sum of the target bit rates (Target_Ratei) to satisfy a predetermined allowable value by correcting the temporary bit rate (Tmp_Ratei) so as to determine a final target bit rate (Target_Ratei) and inputing the final target bit rate (Target_Ratei) to each of the image encoders (2i).
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: April 25, 2006
    Assignee: Sony Corporation
    Inventors: Kanji Mihara, Takuya Kitamura