Patents by Inventor Seiichi Mita
Seiichi Mita 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: 10502832Abstract: In an object recognition apparatus, a range point acquirer irradiates each of irradiation areas arranged in a horizontally and vertically extending grid and forming a detection area for detecting a target with laser light and receives the reflected light from the respective irradiation areas, thereby acquiring a plurality of range points representing per-irradiation area coordinates of the target. A noise remover is configured to, based on either or both of degrees of angle proximity and degrees of distance proximity between a plurality of subject range points to be determined whether to be a noise point, of the plurality of range points, as viewed from a reference point, determine whether or not each of the subject range points is a noise point, and remove the noise point from the plurality of range points. An object recognizer uses the plurality of range points other than the noise points to recognize the object.Type: GrantFiled: February 26, 2016Date of Patent: December 10, 2019Assignees: DENSO CORPORATION, TOYOTA SCHOOL FOUNDATIONInventors: Hossein Tehrani Niknejad, Utsushi Sakai, Takashi Ogawa, Seiichi Mita, Qiwei Xie
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Patent number: 10043106Abstract: A corresponding point searching method searches corresponding points in plural images, acquired by in-vehicle cameras, for each pixel in a reference image by using a predetermined first method, for example, the Viterbi algorithm. The method searches corresponding points in the plural images for each pixel in the reference image by using a predetermined second method, for example, an optical flow method. The method detects whether or not a search accuracy of the corresponding points in each region divided in the reference image obtained by the predetermined first method is not less than a reference value. When not less than the reference value, the method selects the corresponding points obtained by the predetermined first method. When less than the reference value, the searching method selects the corresponding points obtained by the predetermined second method. The searching method provides the corresponding points between the plural images with a high accuracy.Type: GrantFiled: June 2, 2016Date of Patent: August 7, 2018Assignees: DENSO CORPORATION, TOYOTA SCHOOL FOUNDATIONInventors: Kazuhisa Ishimaru, Noriaki Shirai, Hossein Tehrani Niknejad, Seiichi Mita, Qiwei Xie, Qian Long
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Patent number: 9796378Abstract: When a travel path is to be generated for a vehicle, road surface lines (white lines, etc.) delimiting the traffic lane of the vehicle, and also external objects in the vehicle environment, are detected and registered as respective obstacles. Specific points are defined at appropriate locations on each obstacle, and the travel path is generated by connecting respective mid-point positions between opposed pairs of specific points, each pair defined on respective ones of an opposed (left-side, right-side) pair of the registered obstacles.Type: GrantFiled: January 14, 2014Date of Patent: October 24, 2017Assignee: DENSO CORPORATIONInventors: Tomohiko Tsuruta, Yusuke Ueda, Takeshi Hatoh, Takayuki Kondoh, Naoya Inoue, Hossein Tehrani Niknejad, Seiichi Mita
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Publication number: 20170201736Abstract: A range correction device includes an image acquiring unit, a collimating unit, a disparity calculating unit, and an updating unit. The image acquiring unit acquires stereo images formed of a plurality of simultaneously captured images. The collimating unit collimates the stereo images acquired by the image acquiring unit, using a correction parameter for correcting a vertical displacement between stereo images. The disparity calculating unit calculates a distribution of horizontal disparities between the stereo images from the stereo images collimated by the collimating unit. The updating unit calculates a distribution of vertical displacements between the stereo images on the basis of the stereo images and the distribution of horizontal disparities calculated by the disparity calculating unit and updates the correction parameter on the basis of the distribution of the calculated vertical displacements.Type: ApplicationFiled: June 17, 2015Publication date: July 13, 2017Inventors: Kazuhisa Ishimaru, Hossein Tehrani Niknejad, Seiichi Mita, Qian Long
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Publication number: 20170064286Abstract: A parallax detection device receives right side image and a left side image, makes right and left low resolution images, and divides the right low resolution image into blocks composed of pixels. For every block, the device detects a parallax of the block by searching the block in the left low resolution image having the region the same as the region of the block of the right low resolution image by using a dynamic programming method. The device divides the right side image into blocks, and searches a resolution corresponding block in the left side image having the region the same as the region of the block for every block by using a block matching method to detect a parallax of the block. The device limits the searching range of the resolution corresponding block in the left side image based on the parallax detection result obtained by the dynamic programming method.Type: ApplicationFiled: August 18, 2016Publication date: March 2, 2017Inventors: Kazuhisa Ishimaru, Noriaki Shirai, Seiichi Mita, Qian Long
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Publication number: 20160358325Abstract: A corresponding point searching method searches corresponding points in plural images, acquired by in-vehicle cameras, for each pixel in a reference image by using a predetermined first method, for example, the Viterbi algorithm. The method searches corresponding points in the plural images for each pixel in the reference image by using a predetermined second method, for example, an optical flow method. The method detects whether or not a search accuracy of the corresponding points in each region divided in the reference image obtained by the predetermined first method is not less than a reference value. When not less than the reference value, the method selects the corresponding points obtained by the predetermined first method. When less than the reference value, the searching method selects the corresponding points obtained by the predetermined second method. The searching method provides the corresponding points between the plural images with a high accuracy.Type: ApplicationFiled: June 2, 2016Publication date: December 8, 2016Inventors: Kazuhisa Ishimaru, Noriaki Shirai, Hossein Tehrani Niknejad, Seiichi Mita, Qiwei Xie, Qian Long
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Publication number: 20160252617Abstract: In an object recognition apparatus, a range point acquirer irradiates each of irradiation areas arranged in a horizontally and vertically extending grid and forming a detection area for detecting a target with laser light and receives the reflected light from the respective irradiation areas, thereby acquiring a plurality of range points representing per-irradiation area coordinates of the target. A noise remover is configured to, based on either or both of degrees of angle proximity and degrees of distance proximity between a plurality of subject range points to be determined whether to be a noise point, of the plurality of range points, as viewed from a reference point, determine whether or not each of the subject range points is a noise point, and remove the noise point from the plurality of range points. An object recognizer uses the plurality of range points other than the noise points to recognize the object.Type: ApplicationFiled: February 26, 2016Publication date: September 1, 2016Inventors: Hossein Tehrani Niknejad, Utsushi Sakai, Takashi Ogawa, Seiichi Mita, Qiwei Xie
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Publication number: 20140200801Abstract: When a travel path is to be generated for a vehicle, road surface lines (white lines, etc.) delimiting the traffic lane of the vehicle, and also external objects in the vehicle environment, are detected and registered as respective obstacles. Specific points are defined at appropriate locations on each obstacle, and the travel path is generated by connecting respective mid-point positions between opposed pairs of specific points, each pair defined on respective ones of an opposed (left-side, right-side) pair of the registered obstacles.Type: ApplicationFiled: January 14, 2014Publication date: July 17, 2014Applicant: DENSO CORPORATIONInventors: Tomohiko Tsuruta, Yusuke Ueda, Takeshi Hatoh, Takayuki Kondoh, Naoya Inoue, Hossein Tehrani Niknejad, Seiichi Mita
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Patent number: 8117518Abstract: In a data recovery processing, the conventional overhead, primarily, latency due to a rotational recording media is removed. Secondary, in a signal processing or in a recording and reproducing apparatus, reliability of data reproduction is improved by repeatedly processing data. These processing are achieved that input signal, i.e., raw analog signal read from the recording media is digitized to be stored in a secondary storage such as a memory or a FIFO memory. The apparatus includes a signal processing circuit to repeatedly process the stored digital signal in the secondary storage. When detecting data, operation of the circuit is efficiently controlled by a change over detector parameters, in which characteristics for the detecting performance. Resultantly, data recovery processing speed is increased and reliability of data reproduced is improved.Type: GrantFiled: December 21, 2007Date of Patent: February 14, 2012Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Terumi Takashi, Seiichi Mita, Atsushi Saito
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Publication number: 20080178060Abstract: In a data recovery processing, the conventional overhead, primarily, latency due to a rotational recording media is removed. Secondary, in a signal processing or in a recording and reproducing apparatus, reliability of data reproduction is improved by repeatedly processing data. These processing are achieved that input signal, i.e., raw analog signal read from the recording media is digitized to be stored in a secondary storage such as a memory or a FIFO memory. The apparatus includes a signal processing circuit to repeatedly process the stored digital signal in the secondary storage. When detecting data, operation of the circuit is efficiently controlled by a change over detector parameters, in which characteristics for the detecting performance. Resultantly, data recovery processing speed is increased and reliability of data reproduced is improved.Type: ApplicationFiled: December 21, 2007Publication date: July 24, 2008Inventors: Terumi Takashi, Seiichi Mita, Atsushi Saito
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Patent number: 7334165Abstract: In a data recovery processing, the conventional overhead, primarily, latency due to a rotational recording media is removed. Secondary, in a signal processing or in a recording and reproducing apparatus, reliability of data reproduction is improved by repeatedly processing data. These processing are achieved that input signal, i.e., raw analog signal read from the recording media is digitized to be stored in a secondary storage such as a memory or a FIFO memory. The apparatus includes a signal processing circuit to repeatedly process the stored digital signal in the secondary storage. When detecting data, operation of the circuit is efficiently controlled by a change over detector parameters, in which characteristics for the detecting performance. Resultantly, data recovery processing speed is increased and reliability of data reproduced is improved.Type: GrantFiled: November 15, 2005Date of Patent: February 19, 2008Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Terumi Takashi, Seiichi Mita, Atsushi Saito
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Patent number: 7296215Abstract: In one embodiment, a symbol error correction encoder effects block interleaving on recording data and thereafter performs first error correction encoding on the recording data. Next, a symbol error correction encoder performs encoding on the whole block. A reproducing processing circuit outputs likelihood information of respective bits. A first error correction decoder corrects a random error produced upon recording and reproduction, using the likelihood information. Since it is possible to make an improvement in performance with respect to the random error by repetitive decoding at this time, the post-correction data is returned to the reproducing processing circuit. After the completion of such repetitive processing, the data is digitized and subjected to an error correction in symbol unit by a hard determination, and outputted to a symbol error correction decoder.Type: GrantFiled: August 18, 2004Date of Patent: November 13, 2007Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Morishi Izumita, Terumi Takashi, Hideki Sawaguchi, Seiichi Mita
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Patent number: 7199955Abstract: In a coding method which does not restrict a run length of “1” while data is recorded/reproduced, there are such a drawback that when an error correction is carried out, a total number of error data to be corrected is increased, and also errors of not-detectable data are increased. While data is coded, a continuous number of “1” contained in a code word is limited, and then an error correction is carried out inside a coding/decoding process operation. Thus, a recording/reproducing apparatus having a small number of decoding errors is available.Type: GrantFiled: January 22, 2004Date of Patent: April 3, 2007Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Akihiko Hirano, Seiichi Mita, Yoshiju Watanabe
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Patent number: 7046745Abstract: In a data demodulating method, predetermined input data is demodulated based upon a response characteristic of the partial response class 4; the demodulated input data is discrete-filtered to thereby produce filtering data; and the filtering data is maximum likelihood-decoded to thereby produce asymmetrical response data. Further, a magnetic recording/reproducing apparatus is arranged by using this data demodulating method.Type: GrantFiled: November 13, 2001Date of Patent: May 16, 2006Assignee: Hitachi, Ltd.Inventors: Seiichi Mita, Hideki Sawaguchi, Naoya Kobayashi, Masaharu Kondo
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Patent number: 7028214Abstract: In a data recovery processing, the conventional overhead, primarily, latency due to a rotational recording media is removed. Secondary, in a signal processing or in a recording and reproducing apparatus, reliability of data reproduction is improved by repeatedly processing data. These processing are achieved that input signal, i.e., raw analog signal read from the recording media is digitized to be stored in a secondary storage such as a memory or a FIFO memory. The apparatus includes a signal processing circuit to repeatedly process the stored digital signal in the secondary storage. When detecting data, operation of the circuit is efficiently controlled by a change over detector parameters, in which characteristics for the detecting performance. Resultantly, data recovery processing speed is increased and reliability of data reproduced is improved.Type: GrantFiled: July 29, 2002Date of Patent: April 11, 2006Assignee: Hitachi, Ltd.Inventors: Terumi Takashi, Seiichi Mita, Atsushi Saito
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Publication number: 20060069945Abstract: In a data recovery processing, the conventional overhead, primarily, latency due to a rotational recording media is removed. Secondary, in a signal processing or in a recording and reproducing apparatus, reliability of data reproduction is improved by repeatedly processing data. These processing are achieved that input signal, i.e., raw analog signal read from the recording media is digitized to be stored in a secondary storage such as a memory or a FIFO memory. The apparatus includes a signal processing circuit to repeatedly process the stored digital signal in the secondary storage. When detecting data, operation of the circuit is efficiently controlled by a change over detector parameters, in which characteristics for the detecting performance. Resultantly, data recovery processing speed is increased and reliability of data reproduced is improved.Type: ApplicationFiled: November 15, 2005Publication date: March 30, 2006Inventors: Terumi Takashi, Seiichi Mita, Atsushi Saito
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Patent number: 6873665Abstract: A digital magnetic recording/reproducing apparatus includes an LVA (List Viterbi Algorithm) detector which produces first to nth best sequences (n>1) of a decoded result, and replaces a likelihood ratio and a path memory of the ith best sequence (i=2, 3, . . . , n) with those of the (2i?1)th best sequence when contents of path memories of the (i?1)th and ith best sequences are equal to each other and an absolute value of a difference between likelihood ratios of the (i?1)th and (2i?1)th best sequences is smaller than a decision threshold. Alternatively, the LVA detector initializes a likelihood ratio of the ith best sequence to be a likelihood ratio of the (i?1)th best sequence with a constant difference value added thereto when contents of path memories of the (i?1)th and ith best sequences are equal to each other.Type: GrantFiled: June 25, 2001Date of Patent: March 29, 2005Assignee: Hitachi, Ltd.Inventors: Naoya Kobayashi, Seiichi Mita, Masaharu Kondo, Hideki Sawaguchi, Takashi Moriyasu
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Publication number: 20050044468Abstract: In one embodiment, a symbol error correction encoder effects block interleaving on recording data and thereafter performs first error correction encoding on the recording data. Next, a symbol error correction encoder performs encoding on the whole block. A reproducing processing circuit outputs likelihood information of respective bits. A first error correction decoder corrects a random error produced upon recording and reproduction, using the likelihood information. Since it is possible to make an improvement in performance with respect to the random error by repetitive decoding at this time, the post-correction data is returned to the reproducing processing circuit. After the completion of such repetitive processing, the data is digitized and subjected to an error correction in symbol unit by a hard determination, and outputted to a symbol error correction decoder.Type: ApplicationFiled: August 18, 2004Publication date: February 24, 2005Applicants: Hitachi Global Storage Technologies, Japan, Ltd., Toyota Technological InstituteInventors: Morishi Izumita, Terumi Takashi, Hideki Sawaguchi, Seiichi Mita
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Patent number: 6842875Abstract: A signal processing apparatus capable of reducing burst error generation, and a highly reliable data recording/reproducing apparatus using this signal processing apparatus. This signal processing apparatus has a simple error detection/correction circuit provided just before a modulated code demodulator, thereby correcting error of a pattern easy to occur in a maximum likelihood decoder. The simple error detection/correction circuit is an error detection/correction circuit using a linear error correction code, for example, an error correction code (CRCC) formed of a cyclic code. Thus the number of burst errors after the modulated code demodulator can be decreased.Type: GrantFiled: October 15, 2002Date of Patent: January 11, 2005Assignee: Hitachi, Ltd.Inventors: Masaharu Kondo, Seiichi Mita
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Publication number: 20040156136Abstract: In a coding method which does not restrict a run length of “1” while data is recorded/reproduced, there are such a drawback that when an error correction is carried out, a total number of error data to be corrected is increased, and also errors of not-detectable data are increased. While data is coded, a continuous number of “1” contained in a code word is limited, and then an error correction is carried out inside a coding/decoding process operation. Thus, a recording/reproducing apparatus having a small number of decoding errors is available.Type: ApplicationFiled: January 22, 2004Publication date: August 12, 2004Inventors: Akihiko Hirano, Seiichi Mita, Yoshiju Watanabe