Patents by Inventor Masako Asamura
Masako Asamura 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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Publication number: 20080151103Abstract: A video signal processing apparatus, which can prevent degradation of picture quality in converting an interlaced scan video signal to a progressive scan video signal, includes an interframe correlation detection means (11); an interfield correlation detection means (12); a field resolution determination means (13) which generates a signal (filhv) indicative of a degree of high frequency components existing in a field; a pull-down sequence detection means (14) which generates a telecine detection signal (tci) indicating whether or not an input video signal is any of 2-3 pull-down telecine video signal and 2-2 pull-down telecine video signal and also generates a mixing ratio signal (tcmix) indicative of a mixing ratio used at the time of interpolation processing; an interpolation signal generation means (110) which mixes a plurality of kinds of interpolation signals (Im, It) in accordance with the telecine detection signal (tci) and the mixing ratio signal (tcmix); and a rate doubling conversion means (9) whicType: ApplicationFiled: November 21, 2005Publication date: June 26, 2008Inventors: Masako Asamura, Koji Minami, Chihiro Sakuwa, Toshihiro Gai
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Patent number: 7369746Abstract: Data separating means extracts intra-frame or intra-field encoded blocks from an intra-frame or intra-field encoded, and inter-frame or inter-field encoded digital video signal, and a digital audio signal contained in an input bit stream. Error correction code appending means appends error correction codes to the extracted intra-encoded blocks. Recording means records the data having the error correction code appended, in special replay data recording areas predefined on the magnetic recording tape. During fast replay or slow replay, error correction is achieved even for the replay signal with a low output level and a poor symbol rate.Type: GrantFiled: October 30, 2001Date of Patent: May 6, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tomohiro Ueda, Taketoshi Hibi, Junko Ishimoto, Masako Asamura, Nobuyoshi Okumura, Sadayuki Inoue, Tohru Inoue, Ken Onishi
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Publication number: 20080062101Abstract: A gray-scale conversion means (10) converts the gray scale of an input video signal (100) as necessary, and outputs the video signal with the converted gray scale. A statistical processing means (13) detects a statistical property of each field or frame of the input video signal; a scene change detection means (16) detects scene changes in the input video signal. A conversion characteristic determination means (22) determines the gray-scale conversion characteristic according to outputs of the statistical processing means (13) and the scene change detection means (16). The gray-scale correction increases contrast regardless of image content, and enables faster response to changes in image content.Type: ApplicationFiled: February 16, 2005Publication date: March 13, 2008Inventors: Koji Minami, Chihiro Sakuwa, Toshihiro Gai, Masako Asamura
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Patent number: 7280709Abstract: In the conversion of a video signal from interlaced to progressive scanning, the value of each pixel on an interpolated scan line is calculated by a procedure that includes calculating similarity values for pairs of pixel blocks located in point-symmetrical positions on opposite sides of the interpolated pixel; deciding whether similar edges are present in corresponding positions in the two pixel blocks constituting each pixel block pair; selecting an interpolation direction corresponding to the most similar pixel block pair among the pixel block pairs in which the similar edges are present; and using the pixels disposed at or closest to the centers of the two pixel blocks in this pixel block pair as reference pixels. Restricting diagonal interpolation directions to pixel block pairs in which similar edges are present improves the accuracy of the interpolation direction.Type: GrantFiled: December 23, 2003Date of Patent: October 9, 2007Assignee: Mitsubishi Electric CorporationInventors: Koji Minami, Masako Asamura, Chihiro Sakuwa, Toshihiro Gai
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Publication number: 20070229709Abstract: A video noise reducer processes a frame difference signal equal to the difference between the video signal of the current frame and the video signal of the preceding frame or the difference between the video signal of the current frame and the noise-reduced video signal of the preceding frame to obtain a motion detection signal and a noise detection signal. The difference between the motion detection signal and the noise detection signal is then processed to obtain a recursion coefficient. The frame difference signal is multiplied by the recursion coefficient and the resulting product is additively combined with the video signal of the current frame to reduce noise without generating significant motion artifacts.Type: ApplicationFiled: March 16, 2007Publication date: October 4, 2007Inventors: Masako Asamura, Koji Minami, Chihiro Sakuwa, Toshihiro Gai
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Patent number: 7174090Abstract: In a digital VTR having a certain recording bit rate, within a range not higher than a remaining data rate after recording the bit stream, first HP data D1 is recorded in first specific regions, and second HP data D2 is recorded in second specific regions in specific tracks. In middle-speed and high-speed fast replay, the magnetic tape is transported continuously at a middle-speed or high-speed higher than the standard speed for normal replay, and the first HP data D1 is used in common, and at a low-speed fast replay of about twice the normal speed, the speed of the magnetic tape is alternated between a speed near the standard speed for normal replay, and a speed near the low-speed fast, and at the speed near the standard speed, the second HP data disposed in the second specific regions in the specific tracks and the first HP data disposed in the first specific regions in the specific tracks are both replayed.Type: GrantFiled: May 6, 2004Date of Patent: February 6, 2007Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Satoshi Kurahashi, Tomohiro Ueda, Taketoshi Hibi, Tatsuo Yamasaki, Junko Ishimoto, Tohru Inoue, Ken Onishi
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Publication number: 20060290818Abstract: A video signal processing circuit that uses a prescribed clock signal to process a digitized composite video signal. A clock generating means (2) generates the prescribed clock signal; a burst phase detecting means (3) detects color subcarrier phase information (p) in each line of the composite video signal; a phase difference calculation means (4) finds the phase difference between phase information (p) from the burst phase detecting means and a prescribed reference phase; a sampling phase conversion means (8) corrects the sampling phase of the composite video signal according to phase corrections (?b, ?t) obtained from the phase difference calculation means (4); a Y/C separation means (9) separates the luminance and chrominance signals from the composite video signal output from the sampling phase conversion means (8). Excellent two- or three-dimensional Y/C separation can be obtained regardless of the television broadcast system, even from a non-standard signal.Type: ApplicationFiled: August 25, 2004Publication date: December 28, 2006Inventors: Masako Asamura, Yoshito Suzuki, Toshihiro Gai, Koji Minami, Masaki Yamakawa
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Patent number: 7146044Abstract: A color conversion device and method are provided in which six hues and inter-hue areas are corrected independently, and the conversion characteristics can be changed flexibly, and which does not require a large-capacity memory. Coefficients of second-order and first-order calculation terms relating to the respective hues, first-order calculation term using comparison-result data relating to the respective inter-hue areas, and product terms based on the comparison-result data and the hue data are changed so as to change the target hue or inter-hue area, without influencing other hues or inter-hue areas.Type: GrantFiled: June 8, 2004Date of Patent: December 5, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Shuichi Kagawa, Yoshiko Hatano, Hiroaki Sugiura
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Patent number: 6977964Abstract: A digital VTR for magnetically recording and replaying a bit stream, includes a detector, an extractor, a mode designator, and an output unit. The detector detects intra-picture data in the bit stream being replayed from tracks in a magnetic medium. The extractor extracts the intra-picture data from the bit stream based on output from the detector. The mode designator designates one of a normal replay and a slow replay as a replay mode. The slow replay is replay performed at a speed slower than normal replay. The output unit stores the extracted intra-picture data, and outputs only the extracted intra-picture data as replay picture data when the slow replay mode is designated.Type: GrantFiled: March 31, 2000Date of Patent: December 20, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Satoshi Kurahashi, Tomohiro Ueda, Taketoshi Hibi, Tatsuo Yamasaki, Junko Ishimoto, Tohru Inoue, Ken Onishi
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Publication number: 20050185925Abstract: In a digital VTR having a certain recording bit rate, within a range not higher than a remaining data rate after recording the bit stream, first HP data D1 is recorded in first specific regions, and second HP data D2 is recorded in second specific regions in specific tracks. In middle-speed and high-speed fast replay, the magnetic tape is transported continuously at a middle-speed or high-speed higher than the standard speed for normal replay, and the first HP data D1 is used in common, and at a low-speed fast replay of about twice the normal speed, the speed of the magnetic tape is alternated between a speed near the standard speed for normal replay, and a speed near the low-speed fast, and at the speed near the standard speed, the second HP data disposed in the second specific regions in the specific tracks and the first HP data disposed in the first specific regions in the specific tracks are both replayed.Type: ApplicationFiled: April 27, 2005Publication date: August 25, 2005Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Satoshi Kurahashi, Tomohiro Ueda, Taketoshi Hibi, Tatsuo Yamasaki, Junko Ishimoto, Tohru Inoue, Ken Onishi
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Patent number: 6904167Abstract: A color conversion device and method are provided in which six hues and inter-hue areas are corrected independently, and the conversion characteristics can be changed flexibly, and which does not require a large-capacity memory. Coefficients of second-order and first-order calculation terms relating to the respective hues, first-order calculation term using comparison-result data relating to the respective inter-hue areas, and product terms based on the comparison-result data and the hue data are changed so as to change the target hue or inter-hue area, without influencing other hues or inter-hue areas.Type: GrantFiled: September 8, 2003Date of Patent: June 7, 2005Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Shuichi Kagawa, Yoshiko Hatano, Hiroaki Sugiura
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Publication number: 20040246546Abstract: In the conversion of a video signal from interlaced to progressive scanning, the value of each pixel on an interpolated scan line is calculated by a procedure that includes calculating similarity values for pairs of pixel blocks located in point-symmetrical positions on opposite sides of the interpolated pixel; deciding whether similar edges are present in corresponding positions in the two pixel blocks constituting each pixel block pair; selecting an interpolation direction corresponding to the most similar pixel block pair among the pixel block pairs in which the similar edges are present; and using the pixels disposed at or closest to the centers of the two pixel blocks in this pixel block pair as reference pixels. Restricting diagonal interpolation directions to pixel block pairs in which similar edges are present improves the accuracy of the interpolation direction.Type: ApplicationFiled: December 23, 2003Publication date: December 9, 2004Inventors: Koji Minami, Masako Asamura, Chihiro Sakuwa, Toshihiro Gai
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Patent number: 6829062Abstract: By changing coefficients of second-order and first-order calculation terms relating to respective hues, and first-order calculation terms in the form of comparison-result data relating to respective inter-hue areas, only the target hue or inter-hue area among the six hues of red, blue, green, yellow, cyan, and magenta, and the six inter-hue areas can be varied, without affecting other hues and inter-hue areas. Thus, the six hues and six inter-hue areas can be corrected independently, and the large-capacity memory is not required.Type: GrantFiled: June 13, 2002Date of Patent: December 7, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Shuichi Kagawa, Yoshiko Hatano, Hiroaki Sugiura, Kazuya Maeshima, Takashi Okamoto
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Publication number: 20040223642Abstract: A color conversion device and method are provided in which six hues and inter-hue areas are corrected independently, and the conversion characteristics can be changed flexibly, and which does not require a large-capacity memory. Coefficients of second-order and first-order calculation terms relating to the respective hues, first-order calculation term using comparison-result data relating to the respective inter-hue areas, and product terms based on the comparison-result data and the hue data are changed so as to change the target hue or inter-hue area, without influencing other hues or inter-hue areas.Type: ApplicationFiled: June 8, 2004Publication date: November 11, 2004Inventors: Masako Asamura, Shuichi Kagawa, Yoshiko Hatano, Hiroaki Sugiura
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Publication number: 20040202452Abstract: In a digital VTR having a certain recording bit rate, within a range not higher than a remaining data rate after recording the bit stream, first HP data D1 is recorded in first specific regions, and second HP data D2 is recorded in second specific regions in specific tracks. In middle-speed and high-speed fast replay, the magnetic tape is transported continuously at a middle-speed or high-speed higher than the standard speed for normal replay, and the first HP data D1 is used in common, and at a low-speed fast replay of about twice the normal speed, the speed of the magnetic tape is alternated between a speed near the standard speed for normal replay, and a speed near the low-speed fast, and at the speed near the standard speed, the second HP data disposed in the second specific regions in the specific tracks and the first HP data disposed in the first specific regions in the specific tracks are both replayed.Type: ApplicationFiled: May 6, 2004Publication date: October 14, 2004Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Satoshi Kurahashi, Tomohiro Ueda, Taketoshi Hibi, Tatsuo Yamasaki, Junko Ishimoto, Tohru Inoue, Ken Onishi
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Publication number: 20040202451Abstract: In a digital VTR having a certain recording bit rate, within a range not higher than a remaining data rate after recording the bit stream, first HP data D1 is recorded in first specific regions, and second HP data D2 is recorded in second specific regions in specific tracks. In middle-speed and high-speed fast replay, the magnetic tape is transported continuously at a middle-speed or high-speed higher than the standard speed for normal replay, and the first HP data D1 is used in common, and at a low-speed fast replay of about twice the normal speed, the speed of the magnetic tape is alternated between a speed near the standard speed for normal replay, and a speed near the low-speed fast, and at the speed near the standard speed, the second HP data disposed in the second specific regions in the specific tracks and the first HP data disposed in the first specific regions in the specific tracks are both replayed.Type: ApplicationFiled: May 6, 2004Publication date: October 14, 2004Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Satoshi Kurahashi, Tomohiro Ueda, Taketoshi Hibi, Tatsuo Yamasaki, Junko Ishimoto, Tohru Inoue, Ken Onishi
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Patent number: 6766049Abstract: A color conversion device and method are provided in which six hues and inter-hue areas are corrected independently, and the conversion characteristics can be changed flexibly, and which does not require a large-capacity memory. Coefficients of second-order and first-order calculation terms relating to the respective hues, first-order calculation term using comparison-result data relating to the respective inter-hue areas, and product terms based on the comparison-result data and the hue data are changed so as to change the target hue or inter-hue area, without influencing other hues or inter-hue areas.Type: GrantFiled: July 8, 1999Date of Patent: July 20, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Shuichi Kagawa, Yoshiko Hatano, Hiroaki Sugiura
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Publication number: 20040051890Abstract: A color conversion device and method are provided in which six hues and inter-hue areas are corrected independently, and the conversion characteristics can be changed flexibly, and which does not require a large-capacity memory. Coefficients of second-order and first-order calculation terms relating to the respective hues, first-order calculation term using comparison-result data relating to the respective inter-hue areas, and product terms based on the comparison-result data and the hue data are changed so as to change the target hue or inter-hue area, without influencing other hues or inter-hue areas.Type: ApplicationFiled: September 8, 2003Publication date: March 18, 2004Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Shuichi Kagawa, Yoshiko Hatano, Hiroaki Sugiura
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Publication number: 20030152265Abstract: A color conversion device and method are provided in which six hues and inter-hue areas are corrected independently, and the conversion characteristics can be changed flexibly, and which does not require a large-capacity memory. Coefficients of second-order and first-order calculation terms relating to the respective hues, first-order calculation term using comparison-result data relating to the respective inter-hue areas, and product terms based on the comparison-result data and the hue data are changed so as to change the target hue or inter-hue area, without influencing other hues or inter-hue areas.Type: ApplicationFiled: July 8, 1999Publication date: August 14, 2003Inventors: MASAKO ASAMURA, SHUICHI KAGAWA, YOSHIKO HATANO, HIROAKI SUGIURA
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Publication number: 20030016373Abstract: By changing coefficients of second-order and first-order calculation terms relating to respective hues, and first-order calculation terms in the form of comparison-result data relating to respective inter-hue areas, only the target hue or inter-hue area among the six hues of red, blue, green, yellow, cyan, and magenta, and the six inter-hue areas can be varied, without affecting other hues and inter-hue areas. Thus, the six hues and six inter-hue areas can be corrected independently, and the large-capacity memory is not required.Type: ApplicationFiled: June 13, 2002Publication date: January 23, 2003Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Masako Asamura, Shuichi Kagawa, Yoshiko Hatano, Hiroaki Sugiura, Kazuya Maeshima, Takashi Okamoto