Abstract: A peak holding circuit comprises a capacitor for holding signal charges corresponding to a peak level of an input signal, and a current amplifier circuit comprising transistors connected in a triple darlington manner for supplying an output current corresponding to the held charges. An emitter of a transistor in the first stage out of the transistors connected in a darlington manner is connected to a collector of another transistor through which a collector cut-off current flows which is approximately equal to a collector cut-off current flowing through the transistor in the first stage. The other transistor has its emitter connected to ground. Therefore, the collector cut-off current flowing through the transistor in the first stage is cancelled, so that fluctuations in output current can be prevented even if a large reactive current is not allowed to flow through a transistor in the final stage out of the transistors connected in a darlington manner.

Abstract: A color temperature detecting device includes a color component detecting element for detecting electric charges for color components excited by incident light and accumulated with the lapse of time to produce color component signals, a comparison circuit for comparing the color component signals with respective given reference signals to produce discharge time length signals which correspond to the respective accumulated amounts of the electric charges, and an output part for obtaining a ratio between the color components on the basis of the discharge time length signals produced from the comparison circuit to produce a signal according to the ratio as color temperature information.

Abstract: A photographic printer has a image taking means such as a color TV camera which takes an image of each picture of a roll of film which includes different sizes of pictures such as 35 mm full-size and 35 mm half-size picture frames to provide image signals, and a memory for storing the image signals. The image signals are read from the memory and displayed as a negative image in the form of a brightness pattern on a display such as CRT. Image signals for a half-size picture are read out from the memory in a direction perpendicular to that in which image signals of a full-size picture are read out, and interpolated so as to display a negative image magnified as large as an image of a full-size picture.

Abstract: The image sensing apparatus includes a first circuit for forming a signal to control the gains of the various color signals included in the outputs of a image sensing device in accordance with the amplitudes of the color-difference signals of the various color signals, a second circuit for forming a signal to control the gains of the various color signals in accordance with the color temperature of an object to be photographed, and a gain control circuit for controlling and determining the gains of the various color signals in response to a combined output of the signals formed by the first and second circuits.

Abstract: A color slide printing method produces image signals representing a positive image of a color slide using a color TV camera, converts the positive image signals into negative image signals for each of three colors using a contrast transfer circuit, sequentially displays the negative image signals for the three colors as black-and-white negative images in a brightness pattern on a black-and-white CRT while respectively inserting red, green and blue filters, each independently of the other two, in the printing optical path. The filtered black-and-white negative images expose color photographic paper. The positive image signals are sent to a color monitor to display thereon a positive color image of the color slide for visual inspection.

Abstract: A circuit for reducing noises of a chrominance signal in a television receiver.

Abstract: A camera including a solid-state sensor (FT) of the charge transfer type, particularly a frame transfer sensor having a pick-up member (PP), a storage member (MP) and a parallel-in, series-out shift register member (SR), in which the number a of rows of radiation-sensitive pick-up elements (P) is larger than the number b of rows of storage elements (M) may be utilized for generating a picture signal which in television and cinematographic display has a picture definition in the field scanning direction which is increased by a factor of a/b.

Abstract: An apparatus for suppressing noises in a color video signal is constructed to extract a frequency band component of the color video signal, to limit the amplitude of the extracted frequency band component, and to subtract the component, which is limited in amplitude, from the color video signal. Thus, a beat component such as a beat component generated by the interference between the main carrier signal and the color carrier signal of a recording video signal is removed from a video signal obtained after demodulation.

Abstract: A recording apparatus for recording a multi-color document on a monochromatic recording medium, and an image reproducing apparatus for reproducing the multi-color image from the monochromatic recording medium. The recording apparatus includes detection equipment for detecting the color of the image recorded on the document, apparatus for monochromatically recording the document image on the recording medium, and apparatus for recording on the recording medium information corresponding to the color detected by the detection means. The image reproducing apparatus includes detection equipment for detecting the information recorded on the recording medium, and apparatus for applying to the image carrier a color corresponding to the information detected by the detection means.

Abstract: The bracket comprises a base portion, one end of the base portion is bent upward defining a wall, the upper end of the wall is bent transverse to the wall extending over the base portion. An adjusting strip is mounted on the upper wall of the base portion and a view finder support is mounted on the adjusting strip. A view finder is mounted on the view finder support. The upper wall of the base portion and the adjusting strip and the view finder support are dimensioned so that the view finder is mounted centrally over the top surface of the video camera.

Abstract: In an automatic focusing apparatus of a video camera, a first focus evaluating value which steeply changes and a second focus evaluating value which gently changes relative to the position of a lens, are detected in response to a video signal obtained in an image sensing circuit (4). A switching circuit (19) alternately selects the first and second focus evaluating values every one field to apply the same to in-focus state detecting circuits (20, 21), respectively. The in-focus state detecting circuits (20, 21), together with a focusing motor control circuit (10), perform an automatic focusing operation by hill-climbing control. In addition, a calculating circuit (22) calculates the relative ratio of the first focus evaluating value to the second focus evaluating value.

Abstract: A video signal reproducing apparatus has a filter circuit interposed in a transmission path for a reproduced luminance signal, and the characteristic of the filter circuit desirably includes a band-eliminating characteristic and a comb-filter passband characteristic which can be selectively emphasized. When the reproduced luminance signal has a normal or relatively smaller frequency bandwidth or a relatively small line correlation component, or when the level of the reproduced carrier chrominance signal is high, the band-eliminating characteristic of the filter circuit is emphasized.

Abstract: Video copying apparatus generates a color sequential video signal from originals having different spectral characteristics, such as photographic slides and negatives. The apparatus includes a color filter wheel with a plurality of color filters that are sequentially interposed into the optical path between a camera and the original. By providing separate red filters in the filter wheel, the spectral pass bands of the red filters can be matched to the separate and distinctive red spectral responses of a slide or a negative. The output color video signal is obtained from a progression of filtered image signals generated by the camera according to the type of original. In one embodiment, a succession of video fields including red image signals from both red filters is continuously applied to a framestore and the selection of the appropriate red signal is made by storing only the color video signals corresponding to the desired type of original.

Abstract: A solid state image pickup apparatus having a selector for selecting a plurality of sensor outputs through predetermined circuits includes a difference processing circuit for calculating a difference between a selected sensor signal and a reference signal selected through the same predetermined circuit as that of the selected sensor signal. The difference processing circuit includes a first holding circuit for holding the sensor signal, a second holding circuit for holding the selected reference signal, and a circuit for receiving the output signals from the first and second holding circuits and outputting a signal corresponding to a difference therebetween.

Abstract: A digital detecting or charge-discharge control circuit is useful in a video camera as a peak detector in an automatic iris control circuit, as a reference voltage generator in an automatic white balance control circuit and/or as a low pass filter in an automatic black balance control circuit. The digital detecting circuit includes multipliers for multiplying by first and second coefficients which determine charging and discharging times, respectively, and the value of such first and second coefficients are controlled or varied in accordance with the selected operating mode of the camera so that broad ranges of iris, white balance and/or black balance control can be achieved.

Abstract: An image pick-up apparatus which has an image pick-up part, a color separating filter arranged in front of the image pick-up part, a driver, a storage part and a read out part. The image pick-up part includes a plurality of horizontal line sensors. The filter has a color repetitive pattern, having a predetermined period in the horizontal direction. The driver has a plurality of states, the successive assumption of which horizontally transfers information in each line sensor at a predetermined interval. The driver is structured and arranged to operate soo that such transfer is stopped intermittently during the transfer interval. The storage part temporarily stores information transferred horizontally from each line sensor, and the read out part sequentially reads out the information in the storage part, line by line.

Abstract: A method of processing information on color images wherein light rays produced by irradiating a color document are split into light rays of two different wavelengths. The two types of light rays obtained in this way are converted into more than four types of output signals which are developed in different colors in accordance with the volumes of light and/or the wavelengths.

Abstract: A color image information processing apparatus includes a plurality of color separation circuits for separating input information into image information for the respective colors on the basis of constants and a CPU for comparing the image information for each color with a predetermined value, wherein each separation circuit changes a corresponding constant in accordance with the result of the comparison by the CPU.

Abstract: A method for selecting a limited number of presentation colors from a larger palette for a selected image. A three dimensional color histogram of said image is generated and a first color is selected based upon the color occurring most frequently in the image. Subsequent presentation colors are selected by choosing one at a time those colors having the highest weighted frequency of occurrence wherein the weighting is such that colors closest to the previously selected color are weighted very little while colors furthest away from the previously selected color are weighted the most.

Abstract: A time base corrector is comprised of a plurality of system function modules implementing the functions for time base correcting an analog composite color video signal with a stable reference video signal. The system function modules obtain control data and communicate status data to a system control through a plurality of module function registers located in each module. The module function registers are connected to and selectable by a system bus of a microprocessor. The microprocessor has the module function registers mapped as addresses in its memory space to provide an architecture for communication and control of each function module by the system control.