-
公开(公告)号：US10313615B2
公开(公告)日：2019-06-04
申请号：US15444516
申请日：2017-02-28
Applicant: Hitachi Kokusai Electric, Inc.
Inventor： Kazuhiko Nakamura
Abstract: There is disclosed an image processing method in which a video signal is inputted from an imaging optical system in which astigmatism remains, and is displayed on a two-dimensional display apparatus. Based on the circumferential direction modulation factor and radial direction modulation factor of a lens used in the imaging optical system, a signal including the amount of vertical or horizontal modulation factor correction proportional to an nth power (n is an integer greater than 1) of a distance from a center position of a screen of the two-dimensional display apparatus is outputted for at least one vertical or horizontal frequency of the two-dimensional display apparatus.
-
公开(公告)号：US09995931B2
公开(公告)日：2018-06-12
申请号：US15464901
申请日：2017-03-21
Applicant: Hitachi Kokusai Electric, Inc.
Inventor： Kazuhiko Nakamura
CPC classification number: G02B27/0068 , G02B17/02 , H04N5/04 , H04N5/208 , H04N5/3572 , H04N9/045 , H04N9/646 , H04N2209/042
Abstract: An imaging device is implemented that corrects contour distortion of the telephoto and wide-angle ends of zoom lens and a reflex lens where the way the contour is distorted significantly differs between the centerward and receding directions. A UHDTV imaging device with a landscape aspect ratio such as 16:9 uses a high-power zoom lens or a reflex lens, obtains type information and aperture ratio information of the lens, obtains and stores coma aberration information of the lens, and individually and independently calculates the amounts of left and right horizontal contour correction in proportion to a distance from the center of a screen (h−H/2), based on the obtained type information and aperture ratio information of the lens and the stored coma aberration information, and individually and independently performs left and right horizontal contour correction, using one of multi-stage horizontal contour correction, multi-stage vertical contour correction, and multi-stage oblique contour correction.
-
Patent Agency Ranking
3.发明授权公开(公告)号：US09319002B2
公开(公告)日：2016-04-19
申请号：US14428518
申请日：2013-06-04
Applicant: HITACHI KOKUSAI ELECTRIC INC.
Inventor： Nobuo Hirose , Kazuhiko Nakamura
CPC classification number: H03F1/0211 , H03F1/0227 , H03F1/32 , H03F1/3241 , H03F3/24 , H04B1/0475 , H04B2001/0425 , H04L27/2614 , H04L27/367
Abstract: The purpose of the invention is to reduce Cartesian loop transmission delay for compensating the distortion occurring in a high-frequency power amplifier and make the distortion compensation converge quickly, thereby increasing the efficiency. A transmission device has: a high-frequency power amplifier; a pre-distortion compensation circuit for independently generating the coefficients of the distortion compensation signal for each order of the odd and even symmetric distortions of the high-frequency power amplifier; a means for varying the power supply voltage of the high-frequency power amplifier with an orthogonal modulation OFDM input signal; a digital frequency converter; a high-frequency band ADC; and a high-frequency band DAC. In the transmission device, an error distortion compensation signal is created from the output of the high-frequency power amplifier and the orthogonal modulation OFDM input signal, and a delay device is inserted at the previous stage of a distortion compensation circuit, said delay device having a delay equivalent to a time constant for varying the power supply voltage of the high-frequency power amplifier with the orthogonal modulation OFDM input signal.
Abstract translation: 本发明的目的是减少用于补偿在高频功率放大器中发生的失真的笛卡尔回路传输延迟，并使失真补偿快速收敛，从而提高效率。 传输装置具有：高频功率放大器; 预失真补偿电路，用于独立地生成高频功率放大器的奇数和偶数对称失真的每个阶数的失真补偿信号的系数; 用正交调制OFDM输入信号改变高频功率放大器的电源电压的装置; 数字变频器; 高频带ADC; 和高频带DAC。 在发送装置中，从高频功率放大器的输出和正交调制OFDM输入信号产生误差补偿信号，在失真补偿电路的前一级插入延迟器，所述延迟器具有 延迟等于用正交调制OFDM输入信号改变高频功率放大器的电源电压的时间常数。
-
4.发明申请公开(公告)号：US20150236655A1
公开(公告)日：2015-08-20
申请号：US14428518
申请日：2013-06-04
Applicant: HITACHI KOKUSAI ELECTRIC INC.
Inventor： Nobuo Hirose , Kazuhiko Nakamura
CPC classification number: H03F1/0211 , H03F1/0227 , H03F1/32 , H03F1/3241 , H03F3/24 , H04B1/0475 , H04B2001/0425 , H04L27/2614 , H04L27/367
Abstract: The purpose of the invention is to reduce Cartesian loop transmission delay for compensating the distortion occurring in a high-frequency power amplifier and make the distortion compensation converge quickly, thereby increasing the efficiency. A transmission device has: a high-frequency power amplifier; a pre-distortion compensation circuit for independently generating the coefficients of the distortion compensation signal for each order of the odd and even symmetric distortions of the high-frequency power amplifier; a means for varying the power supply voltage of the high-frequency power amplifier with an orthogonal modulation OFDM input signal; a digital frequency converter; a high-frequency band ADC; and a high-frequency band DAC. In the transmission device, an error distortion compensation signal is created from the output of the high-frequency power amplifier and the orthogonal modulation OFDM input signal, and a delay device is inserted at the previous stage of a distortion compensation circuit, said delay device having a delay equivalent to a time constant for varying the power supply voltage of the high-frequency power amplifier with the orthogonal modulation OFDM input signal.
Abstract translation: 本发明的目的是减少用于补偿在高频功率放大器中发生的失真的笛卡尔回路传输延迟，并使失真补偿快速收敛，从而提高效率。 传输装置具有：高频功率放大器; 预失真补偿电路，用于独立地生成高频功率放大器的奇数和偶数对称失真的每个阶数的失真补偿信号的系数; 用正交调制OFDM输入信号改变高频功率放大器的电源电压的装置; 数字变频器; 高频带ADC; 和高频带DAC。 在发送装置中，从高频功率放大器的输出和正交调制OFDM输入信号产生误差补偿信号，在失真补偿电路的前一级插入延迟器，所述延迟器具有 延迟等于用正交调制OFDM输入信号改变高频功率放大器的电源电压的时间常数。
-
公开(公告)号：US11006061B2
公开(公告)日：2021-05-11
申请号：US16322281
申请日：2017-06-12
Applicant: HITACHI KOKUSAI ELECTRIC INC.
Inventor： Tadaaki Yanagi , Kazuhiko Nakamura , Kentaro Suguro , Kazuyoshi Sato
IPC: H04N5/365
Abstract: In an image correction method and an image capture device, a one-frame addition average calculation unit calculates a one-frame addition average value. If the one-frame addition average value falls within an appropriate range, a determination circuit inputs image data for one frame to an adder and the adder adds the image data to a cumulative correction value to update the correction value. The updated correction value is stored in a frame memory. If the one-frame addition average value is outside the appropriate range, the image data for one frame is discarded. After updating the cumulative correction value until the number of updates reaches a prescribed number, an FPN correction value is calculated by dividing the cumulative correction value stored in the frame memory by the prescribed number, and an image is corrected by subtracting the FPN correction value from the image data inputted at the time of imaging.
-
公开(公告)号：US10348984B2
公开(公告)日：2019-07-09
申请号：US15507285
申请日：2015-08-24
Applicant: HITACHI KOKUSAI ELECTRIC INC.
Inventor： Kazuhiko Nakamura
Abstract: The purpose of the present invention is to correct the reduced degree of modulation in a diagonal direction in a four-plate camera having a frame memory and R, G1, G2, and B image pickup elements among which two green image pickup elements (G1, G2) shift pixels diagonally. This image pickup method is provided for an image pickup device having two green image pickup elements, a red image pickup element, and a blue image pickup element among which the two green image pickup elements shift pixels diagonally. The method includes, with respect to a contour correction target pixel, generating a diagonal contour correction signal from respective image signals of two diagonally upper left pixels, two diagonally upper right pixels, two diagonally lower left pixels, and two diagonally lower right pixels, and adding the diagonal contour correction signal to an image signal of the contour correction target pixel.
-
公开(公告)号：US10321024B2
公开(公告)日：2019-06-11
申请号：US15509503
申请日：2014-09-26
Applicant: HITACHI KOKUSAI ELECTRIC INC.
Inventor： Kazuhiko Nakamura
Abstract: A color-separation optical system for image capture includes three rolling shutter CMOS image capturing elements of B, G and R, respectively capturing: an image of B at the speed of an integer N multiple of the number of output picture frames, an image of G at the speed of an integer M multiple of N+1, and an image of R at the speed of the integer M multiple of N+1. The vertical synchronization phases of the captured image frames of B, G and R, are offset by approximately half the vertical synchronization period of an even multiple of speed such that the center phases of the captured image frames of B, G and R have approximately the same vertical synchronization phase. A picture to be output uses the vertical effective pictures of the captured image frames having approximately the same vertical synchronization phase.
-
-
-
-
-
-
Search Results
7
records
(took 0.02 seconds)
