Hitachi, Ltd.

Hitachi Denshi Kabushiki Kaisha

Hitachi Medical Corporation

Hitachi Denshi Kabushiki Kaisha & Hitachi

Hitchi Electronics Ltd.

Shusaku Nagahara

Kazuhiro Sato

Kenji Takahashi

Toshiyuki Akiyama

Morishi Izumita

Naoki Ozawa

Koji Kudo

Masuo Umemoto

Iwao Takemoto

Masaharu Kubo

Seiichi Mita

Norio Koike

Masanori Sato

Takashi Nakamura

Toshihisa Tsukada

Akira Sasano

Toru Baji

Eiichi Maruyama

Masanori Maruyama

Shigeki Nishizawa

Haruhisa Ando

Nobukazu Doi

Kazuo Sato

Takuya Imaide

Hideaki Yamamoto

Tadaaki Hirai

Yoshitoshi Ito

Yukio Takasaki

Shinya Ohba

Yoshinori Imamura

Itaru Mimura

Toshifumi Ozaki

Masaaki Nakai

Katsumi Takami

Satoshi Suzuki

Akira Hashimoto

Akihiko Kougami

Shigeyuki Ikeda

Nobuo Murata

Kazuhiro Satou

Saburo Ataka

Tsutomu Fujita

Hideo Onodera

Noriaki Honma

Takeo Nishimura

Mamoru Nonaka

Norio Kokie

Chikafusa Hirano

Toru Kirino

Masanori Hombaugh

Masahiro Achiha

Masanori Honbo

In medical image treating systems, especially when an X-ray image intensifier and TV camera are used, video signals composed of available video signals containing specified image information and unavailable video signals containing no such image information are output from the TV camera. Only the digital video signals of the converted digital video signals corresponding to the available video signals are treated and the digital video signals after treatment are recorded and reproduced with a recording device.

Digital recording and playback system for X-ray video signals

The chromatic aberration of the lens of a multi-tube color TV camera is separated into a linear component and a non-linear component. Horizontal and vertical deflection correction waveforms are generated in accordance with these two components. These two correction waveforms are superimposed onto horizontal and vertical deflection waveforms employed to deflect electron beams in said camera tubes. A registration error caused by the chromatic aberration of the lens is corrected with high accuracy by employing these correction waveforms.

Multi-tube color TV camera in which linear and non-linear components of

A camera tube device for use in, for example, a television camera comprises a cathode emitting electrons, and a first grid and a second grid having respective apertures for converging the electrons emitted from the cathode into a fine electron beam. The aperture of the second grid is sufficiently smaller than that of the first grid and plays an important role for the formation of the electron beam. The electron beam scans a target carrying a charge pattern corresponding to the luminous intensity of an object. Voltages applied to the first and second grids are controlled so as to provide the electron beam quantity corresponding to the luminous intensity of the object forming the charge pattern of the target.

Apparatus for controlling the electron beam in a television camera tube

In an image pickup tube including a cathode, a first grid electrode disposed as a next stage of the cathode and provided with an aperture, a second grid electrode disposed as a next stage of the first grid electrode and provided with an aperture, and a photoconductive target, the first grid electrode is operated by a voltage positive with respect to the cathode. To control the amount of the electron beam of the image pickup tube, a voltage corresponding to a signal current obtained from the photoconductive target of the image pickup tube or to a return beam from the photoconductive target is applied to the second grid electrode in such a manner that a polarity of the applied voltage is opposite to a polarity of a signal charge generated on the photoconductive target.

Method of and apparatus for controlling amount of electron beam in image

An analog signal is stored in an analog memory device, while lower bits of a digital signal obtained by digitizing the analog signal is stored in a digital memory device. An analog signal reproduced from the analog memory device is corrected on the basis of a digital signal reproduced from the digital memory device. The corrected reproduced signal is stored in the memory device again, whereby a recursive storage system is constructed. A signal component degraded by noise in the analog storage is corrected with the digital signal, with the result that storage and reproduction of favorable signal-to-noise ratio are realized.

Signal storage system

A spatial frequency filter apparatus for suppressing spurious signals of the type generated in a color television camera incorporating a mosaic color encoding filter for multiplexing color signals includes two double refraction plates for filtering natural light introduced through a lens system in both the horizontal and vertical directions and an optical plate, such as a quarter wavelength plate or a rotatory polarization plate, interposed between the two double refraction plates. By causing natural light to transmit through the two double refraction plates and the optical plate before being introduced to the mosaic color encoding filter, the spurious signals are suppressed, whereby false color which may otherwise make an appearance at the contours of an image picked up by the color television camera can be significantly reduced.

Optical filter for color imaging device

A solid-state imaging device comprises a number of photodiodes arrayed in horizontal rows and vertical columns, a first output circuit for sequentially reading out signal charges from those photodiodes which are arrayed on odd-numbered horizontal rows, a second output circuit for sequentially reading out signal charges from the photodiodes arrayed on the even-numbered horizontal rows, a synchronizing pulse generator for synchronizing operation of the first and second output circuits, a first subtracting circuit for determining the difference between the output signals of the first and second output circuits in odd-numbered field, and a second subtracting circuit for determining the difference between the output signals of the first and second output circuits in even-numbered field. The outputs of the first and second subtracting circuit are alternately extracted in synchronism with the synchronizing pulse produced by the synchronizing pulse generator. The solid-state imaging device is made immune to the smear phenomenon. The invention can be advantageously applied to the solid-state imaging device of CCD type as well as MOS type.

Solid-state imaging device including noise subtraction with polarity

Disclosed is a solid-state imaging device wherein optical information of a number of photo-electric conversion elements arranged in a matrix is read into vertical signal lines by a vertical shift register and then the optical information on the vertical signal lines is horizontally scanned by a horizontal register of a charge transfer device. Bias charge storage means and quasi-signal sweep-out drains are disposed between the horizontal register and the vertical signal lines, and a bias charge input means is arranged in the horizontal register. In order to ensure high efficiency in transferring signals between the vertical lines to the storage means, the sweep-out drains and the charge transfer device, it is arranged for bias charges to be provided at each stage of transfer. Thus, bias charges supplied from the storage means are used to transfer charges from the vertical lines to the storage means. Similarly bias charges directly injected from the quasi-signal sweep-out drains are used to sweep out quasi-signals from the storage means to the quasi-signal sweep-out drains. Finally bias charges supplied from the bias charge input means of the charge transfer device are used to read signals from the storage means into the charge transfer device. By virtue of this, the sweep-out efficiency of the quasi-signals from the capacitances which supply the bias charges and a read-out efficiency of the signal charges are enhanced and a high quality of video signal is produced.

Solid-state imaging device with high quasi-signal sweep-out efficiency

In a solid state imaging device in which two signals on two horizontal scanning lines are read out simultaneously for easy image enhancement, the two signals read from the two horizontal scanning lines are subtracted from each other while they are added together, and the difference signal is added to the sum signal so as to produce a video signal subject to the image enhancement. As a solid state image sensor, a MOS type image sensor as well as a CCD, CID or CC type image sensor may be used.

Solid state imaging device

A magnetic recording method for digital signals, and more particularly to a magnetic head driving current waveform wherein digital signals to be recorded on a magnetic tape at a high density have the waveform of the head driving current shaped in order to reduce the degradation of the waveform. That is, in a case where the period of the current reversal of the driving current is long and continues for at least 1.5 times the bit period, the amplitude of the current in the rise part of the wave is made small. The driving current of this waveform has a reduced waveform degradation, and the magnetic recording at the high density becomes possible.

Magnetic recording method for digital signal

In a solid state color imaging system comprising a two-dimensional array of photoelectric devices, the photoelectric device in one of two adjacent rows are displaced with respect to those in the other row in the horizontal direction by half a horizontal pitch of the photoelectric devices, and the respective color filter elements associated with three photoelectric devices adjacent to one another in the two rows have such spectrum characteristics that the sum of outputs from the three photoelectric devices substantially corresponds to a luminance signal, whereby Moire is suppressed and high quality color pictures are obtained.

Solid state color imaging system

Disclosed is a solid state television camera with solid state image sensor for converting an optical image into electrical signals, which is comprised of a pulse generator for generating a train of pulses with a frequency equal to the horizontal scanning frequency of a television system, a frequency divider for frequency-dividing the pulse train into a signal with a frequency substantially equal to the vertical scanning frequency alternately in two modes of l/n and l/n+l (where n is a positive integer), and a selective circuitry for forming a train of pulses with a desired vertical scanning frequency on the basis of the pulse trains derived from the pulse generator and the frequency divider.

Pulse generating circuit for a television camera using solid state image

The present invention relates to a color imaging device which suppresses false color signals appearing in an area where the difference of brightnesses is great in the horizontal or vertical direction. When the correlation between picture elements adjacent in the vertical direction is little and the false signal appears in a boundary part in the vertical direction, the false signal is detected, whereupon a color signal is demodulated by utilizing the correlation between the signals of picture elements in the horizontal direction. On the other hand, when the correlation between picture elements adjacent in the horizontal direction is little and the false signal appears in a boundary part in the horizontal direction, the false signal is detected, whereupon a color signal is demodulated by utilizing the correlation between the signals of picture elements in the vertical direction. As a result, the moire phenomenon attributed to the false color signals can be conspicuously reduced. While embodiments of the present invention refer to color imaging devices which employ MOS type solid-state imaging devices, the invention is also applicable to an imaging device which employs CCDs and a color image pickup tube which separates colors by means of a mosaic color filter.

Color imaging device

A color imaging apparatus having a plurality of image pickup tubes which pick up respective optical images of primary colors separated from one optical image includes a registration control circuit which operates to hold a picture of high quality at all times by controlling the registration of the images of the respective image pickup tubes on a real time basis during the operation of the camera. To this end a circuit detects those local image signals which satisfy predetermined requisites which are most favorable for use as reference signals to control the registration and these detected image signals are temporarily stored so as to be used for the registration operation. The most favorable requisites of the local image areas selected for registration control are (1) those having no movement, (2) those having a contour which is sharp and (3) those having a chroma which is low.

Color imaging apparatus

This invention relates to a solid-state imaging apparatus wherein photo signals are read out through MOS type FETs from photosensors such as photodiodes arrayed in two dimensions in large numbers, and consists in remarkably enhancing the signal-to-noise ratio of an output signal by reducing or eliminating noise components to mix into the photo signals. The analysis of the noise components has revealed the correlation in which the noise component in a certain polarity develops in the opposite polarity again after a period that is shorter than one horizontal scanning period by the duration of one horizontal scanning pulse. With note taken of the correlation, a solid-state imaging apparatus comprising a processing circuit which includes a delay circuit and an adder circuit and which cancels the noise is provided.

Noise reducer for a solid state imager

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Hachioji, Japan

Shusaku Nagahara