Victor Company of Japan, Limited

Tadayoshi Miyoshi

Itsuo Takanashi

Shintaro Nakagaki

Kenichi Miyazaki

Sumio Yokokawa

Koichiro Motoyama

Takashi Kuriyama

Ichiro Shishido

Hiroshi Nishiyama

Shigeaki Tada

Kaoru Kitami

Hiromitsu Kurokawa

Makoto Iwahara

Shigeru Kashiwagi

Masaru Osada

Hisanori Tumiyama

Koithiro Motoyama

A first set of different color signals represented in a colorimetric system is converted into a second set of different color signals represented in another colorimetric system. Predetermined main parts of the second set of the color signals are determined in response to predetermined first portions of the first set of the color signals. Calculation coefficients are determined in response to the first portions of the first set of the color signals. Predetermined subordinate parts of the second set of the color signals are calculated from predetermined second portions of the first set of the color signals and the calculation coefficients according to an interpolation. The determined main parts of the second set of the color signals and the calculated subordinate parts of the second set of the color signals are combined into a whole of the second set of the color signals. The calculation coefficients are designed so that, if the color signals in the first set vary by equal values, achromatic color data which results from the calculation lies on an achromatic color axis in a color space defined with respect to the readout data of the main parts of the second set of the color signals, and that the sum of squared errors of color conversion is minimized.

Method and apparatus for processing color signals to convert between

There is provided an improved image reader. In the image reader, light from an object is converted into an analog signal by a photoelectric converter. The signal is quantized by an A/D converter on the basis of top and bottom reference voltages to produce a digital picture signal. A digital picture signal corresponding to a dark current flowing to the photoelectric converter is stored in a memory as a dark current data. Also a digital picture signal corresponding to the optical strength of predetermined level is stored in another memory as a white level data. Then, the top and bottom reference voltages are produced which correspond to the top and bottom quantization-threshold values on the basis of the dark current and white level data, respectively. The top and bottom reference voltages are then respectively applied to the A/D converter to produce the digital picture signal without signal distortion.

Image reader

An apparatus for scanning an image, comprising a main unit body casing, a first original platen having a transparent surface on which a light-reflective original is placed, a second original platen movable in a horizontal direction inside the main unit body casing upon which platen a light-transmissive original is placed, a light source that irradiates light to the first and second original platens, an image sensor, and an optical apparatus disposed inside the body casing, and which respectively passes reflected light from the original placed on the first original platen and light transmitted through the original placed on the second original platen to the image sensor.

Image scanning apparatus

A frame of photographic film is optoelectronically scanned after development to produce an electronic image which is analayzed to determine the exposure and development conditions of the film. Tone conversion signals are generated in accordance with the analyzed conditions to convert the tone characteristics of the electronic image to optimal values and thereby compensate for non-standard exposure and development. The electronic image of the entire frame, or alternatively only a part of the electronic image corresponding to an unexposed area of the frame, may be used to determine the development conditions.

Method of reading an image recorded in a photographic film tone

In a color television camera, a light ray from an object to be taken is split into a plurality of rays to be respectively incident on two or more solid-state imaging devices each equipped with a color separation stripe filter where the imaging devices are positioned so that pixels thereof are horizontally shifted by a predetermined distance from pixels of remaining imaging devices with respect to an image applied thereto. The imaging devices are driven in a sequence, and output signals therefrom are sampled in a sequence so as to produce a single multi-color video signal by combining the plurality of sampled signal components. With this arrangement, the frequency of color signal components within the multi-color video signal is increased from the frequency of each of the output signals from the imaging device. The sampled signal components may be further sampled so that a plurality of color signals corresponding to the colors of the color stripe filters are obtained and their levels are respectively adjusted for obtaining level-adjusted color signal which are then combined to produce a single multi-color video signal.

Color TV camera with plural solid state imaging devices mutually

An image pickup device comprises an image pickup tube having a target scanned by an electron beam and a pair of electrodes which form a collimation, a voltage applying circuit for respectively applying predetermined voltages for forming the collimation to the collimation forming electrodes of the image pickup tube, and a correction voltage applying circuit for applying a correction voltage which varies the voltage ratio of the collimation forming electrodes to one of the collimation forming electrodes, upon scanning of the peripheral parts of an effective scanning surface of the target by the electron beam. The collimation is formed responsive to a voltage ratio of the voltages applied to each of the collimation forming electrodes and changed in response to the correction voltage.

Image pickup device

A color-resolving striped filter used for a camera tube comprises a plurality of groups of filter stripes. The groups are disposed in parallel and consecutively in a sequentially repeated arrangement. Each of the groups comprises six filter strips from among, a first filter stripe having a light transmission characteristic for transmitting the light of one of the three primary colors of an addition mixture color, a second filter stripe having a light transmission characteristic for transmitting the light of a mixed color which includes the primary color transmitted through said first filter stripe and one of the other two primary colors, a transparent third filter stripe for transmitting white light, and three fourth filter stripes each of which is disposed between and adjacent to the first, second, and third filter stripes. The six filter stripes of each group are arranged in parallel and consecutively in a specific sequence.

Color-resolving striped filter for camera tube

A view-finder is used for a television camera which has an image pick-up device for picking up an image of an object responsive to incident light from the object. The television camera comprises an optical system for diverging a part of a light advancing from the object to the image pick-up device. The view-finder comprises a monochrome television picture receiving device which is supplied with an output signal of the image pick-up device and displays a monochrome picture image, and an optical system for composing the picture image of the monochrome television picture receiving device and an optical color image formed by the light diverged by the diverging optical system to form an optical image to be observed.

View-finder for television camera

A horizontal deflection circuit in a television device comprises a circuit for generating a saw-tooth waveform current for horizontal deflection, a horizontal coil supplied with the saw-tooth waveform current thus generated, a saturable reactor type linearity coil having a winding connected in series with the horizontal deflection coil, and a circuit for substantially supplying a correction current to the winding of the linearity coil. The correction current thus supplied varies in response to a temperature variation so that the inductance value of the linearity coil will become constant irrespective of the temperature variation.

Horizontal deflection circuit in a television device

A color television signal generating apparatus comprises a color-resolving striped filter, in a camera tube, for separating the output signal of the camera tube into required signals. The output of the camera tube is a superimposed signal comprising a direct wave signal containing signals of the three primary colors of said addition mixture color, and a high-band signal component comprising a group of modulated color signals resulting from an amplitude modulation of a carrier wave by the signals of two primary colors other than the primary color of the light transmitted through said first filter stripe, said carrier wave having a frequency equal to a space frequency determined by the number of said groups of filter stripes, and said carrier wave also having frequency components which are higher harmonics of the frequency of said carrier wave. The color television signal generating apparatus further comprises a first separation circuit for separating and deriving, out of the output signal of the camera tube, a fundamental wave component signal in which the carrier wave having the frequency equal to the space frequency is amplitude modulated, a second separation circuit for separating and deriving, out of the output signal of the camera tube, a second harmonics wave component signal in which a carrier wave having a frequency twice the space frequency is amplitude modulated, a multiplication circuit for multiplying the output signals of the first and second separation circuits, and a circuit for separating and deriving signals of two primary colors other than the primary color transmitted through the first filter stripe, responsive to the output signals of the multiplication means and the first separation circuit.

Color television signal generating apparatus

A signal processing circuit for a color television camera has filters supplied with a multiplex input signal. The direct wave signal includes a plurality of amplitude-modulated color component signals obtained from a camera tube of a color television camera. The tube filters the high-frequency components of the input signal. Detection and processing circuits detect the output signal of the high-pass filter and produce signals having restored DC components. The circuit provides gamma correction, white clipping, linear clipping, blanking signal mixing, or like signal processing with respect to the produced signal. A low-pass filter passes the input signal from the camera tube and filters the direct wave signal of the input signal. A processing circuit processes the output signals of the low-pass filter, and a matrix circuit matrixes the output signals of the detection and processing circuits to obtain three primary color signals. A color encoder provides a composite color video signal from the three primary color signals produced by the matrix circuit.

Signal processing circuit for a color television camera

A circuit for stabilizing the black level in an output signal of a camera tube is employed in a color television camera. The camera tube has an optical filter with an optically black part extending in parallel with a beam scanning direction of the camera tube. The stabilizing circuit comprises a clamping circuit for clamping an output signal of the camera tube during a horizontal beam blanking period and for restoring a DC component of the output signal. A circuit responds to supplied sampling pulses during every vertical scanning period, for sampling and holding an output signal of the clamping circuit. A circuit feeds back a substantially negative holding voltage of the sampling and holding circuit, to the clamping circuit.

Circuit for stabilizing the black level in an output signal of a camera

An optical comb filter has a plurality of optical comb filter elements disposed successively in the advancing direction of light. The optical comb filter characteristics attenuate and remove specific space frequencies which do not have mutual relationships of odd-number multiples and frequencies of the specific space frequencies. At least one phase plate is interposed between neighboring optical comb filter elements in front and rear positions with respect to the light advancing direction. The phase plate converts a light exiting from the front filter element into a light which is divided in the rear filter element into normal light and abnormal light, exiting with mutually equal light quantity. The normal and abnormal light enters, as incident light, the rear filter element.

Optical comb filter

A color television camera has red filter stripes overlying wider blue filter stripes which in turn overlie a green filter layer. Frequency selective decoding circuitry is provided for separating the red, blue and green representative components of the camera signal.

A circuit for stabilizing electron beam focusing is used for an electromagnetic focusing type camera tube having a high voltage generating circuit for supplying electrodes of the camera tube. A focusing current is supplied to an electron beam focusing coil of the camera tube. The focusing current supply circuit comprises an operational amplifier having an output terminal to which the focusing coil is connected. A detection resistor is connected between the focusing coil and an inverting input terminal of the operational amplifier. A first resistor is connected between the voltage source and a non-inverting input terminal of the operational amplifier. A second resistor is connected between a reference voltage source and the non-inverting input terminal of the operational amplifier.

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Yokohama, Japan

Tadayoshi Miyoshi