Abstract: An image processing apparatus has a memory device for storing pixel image data, including both halftone image data such as data of image of a photograph having a gradation, and line image text data such as data, containing characters. The storage is conducted on the basis of blocks each having a predetermined number of pixels. The mean information quantity of the halftone image data per pixel stored in the memory means is not greater than the information quantity of the line image data per pixel stored in the memory means. The halftone image data is compressed on the basis of blocks. Therefore, both the halftone image data and line image data can be stored in a small memory by using common addresses, without causing any degradation of the image quality.

Abstract: An apparatus receptive of illumination light from an illumination light source for providing a color image on a projection lens includes three displays responsive to a video signal for modulating incident lights to display respective component images, a first dichroic layer for separating the illumination light into a first component light and a first mixed light of different wavelength regions to give the first component light to one of the displays, a second dichroic layer for separating the mixed light into second and third component lights of different wavelength regions to give the second and third component lights to other two of the displays respectively, a third dichroic layer for synthesizing, out of the first, second and third information lights from the displays, the first and second information light, and a fourth dichroic layer for further synthesizing the light synthesized by the third dichroic layer with the third information light.

Abstract: A color video signal recorder is arranged to record on one and the same recording medium first and second signals which are obtained by frequency dividing at different phases the frequency modulation wave of a frequency modulated color video signal which includes a luminance signal and a carrier chrominance signal.

Abstract: An image recording control apparatus analyzes color image data outputted by a host computer and determines whether image data of each recording color component of a printing device is present. If there is a color component for which image data is not present, an image recording process based upon this color component is skipped. As a result, a meaningless recording process is no longer performed even if the side transmitting the recording data does not apply special processing to the recording data about to be transmitted.

Abstract: An apparatus for recording, on a recording medium, still image signal corresponding to a single still image in a predetermined time. The apparatus has a function for producing a warning when an instruction for recording a next still image is given before the predetermined time elapses after the commencement of recording of the preceding still image.

Abstract: This disclosure relates to an image forming apparatus in which an image is formed by deflecting a light beam a minute distance in a sub-scanning direction every pixel of image data. By controlling the emission intensity of the light beam utilizing a .gamma. correction, and by controlling the emission time of the light beam utilizing PWM control, the beam spot can be adjusted to control the dot size of the image. Accordingly, the dot density in image formation can be raised by minute deflection in the sub-scanning direction, and the reproducibility of characters and graphics is improved, particularly in the oblique direction. Furthermore, tone reproducibility of multi-tone image data is enhanced by minute deflection in the sub-scanning direction and adjustment of image dot size.

Abstract: An image signal processing apparatus inputs a video signal, delays it by one field using a field memory, multiplies the delayed signal by a value K (K less than 1), adds the output from the multiplication to the input signal and supplies the sum to the field memory. The level of the signal read out from the field memory is compared with a predetermined value, and based on the result of that comparison, the video signal being input is substantially inhibited from being supplied to the adding means. The signal obtained by multiplying the immediately-preceding field signal by k, and the present-field signal, are cyclically added, so that the amplitude can be gradually increased. The comparison inhibits addition of a new field signal when the level of that stored in the field memory has reached a predetermined level.

Abstract: A video signal recording apparatus which records a video signal on a recording medium after separating a fixed time portion of an input video signal and extending the time axis of the separated video signal.

Abstract: A still image signal recording and reproducing apparatus wherein still image signals, mark signals and moving image signals are recorded on respective different regions on a tape-shaped recording medium. A still image reproducer is provided for reproducing the still image signals and a mark reproducer is provided for reproducing the mark signals. A feeding device is provided for feeding the recording medium longitudinally thereof at a predetermined speed during reproduction of the still image by the still image reproducer. A searching unit is provided for causing the feeder to feed the recording medium at a speed greater than the predetermined speed while causing the mark reproducer to reproduce the mark signals, wherein the searching unit causes the feeding device to reduce the speed of the recording medium, in response to the reproduction of the mark signals by the mark reproducer, during the feed of the recording medium at the speed greater than the predetermined speed.

Abstract: A recording and/or reproducing apparatus is arranged to simultaneously record on a recording medium a plurality of divided signals which are inverted at different timing points from each other according to the inverting timing of an angle modulated information signal; to reproduce the plurality of divided signal simultaneously from the recording medium; to obtain a restored signal which is inverted according to every inverting timing of the plurality of divided signals reproduced from the recording medium; and to correct the time base of at least one of the plurality of reproduced divided signals on the basis of the restored signal.

Abstract: An apparatus for receiving the illumination light from an illumination light souce and for providing a color image on a projection lens includes three displays responsive to a video signal for modulating incident light to display respective component images. Also included are a first dichroic layer for separating the illumination light into a first light component and a first mixed light of different wavelengths to transmit the first light component to one of the displays, a second dichroic layer for separating the mixed light into second and third light component of different wavelengths to transmit the second and third light component to the other two of the displays, respectively, a third dichroic layer for combining the first and second information lights from the first two displays, and a fourth dichroic layer for further combining the information light combined by the third dichroic layer with a third information light from the third display.

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 wide band video signal recording apparatus is arranged to simultaneously record, on a recording medium, multi-channel video signals which are obtained by frequency modulating a luminance signal included in a wide band video signal; by frequency dividing the frequency modulated luminance signal at different phases thereof to obtain multi-channel luminance signals; and by multiplexing a carrier chrominance signal included in the video signal with the low band of at least one of the multi-channel luminance signals.

Abstract: A solid-state image pick-up apparatus for gradually reading out the data of picture elements residing within a range of addresses set according to a given clock signal is provided with means for making constant the read-out amount of the picture element data irrespective of the extent of the set address range, so that the image pick-up magnification is variable by changing the address range.

Abstract: A picture output device of the present invention receives inputs in the form of a first picture signal with n horizontal scanning lines within the vertical scanning period or a second picture signal with m (m>n) horizontal scanning lines within the vertical scanning period, wherein the first picture signal after received is converted in the number of lines within the vertical scanning period to m, and a picture based on either one of the thus-converted first picture signal and the second picture signal is displayed.

Abstract: Liquid jet apparatus comprises: a liquid jet head having an electrical-mechanical transducing element to discharge a liquid; a drive circuit for supplying a driving signal to the electrical-mechanical transducing element; a directional coupling circuit provided between the electrical-mechanical transducing element and the drive circuit; and a detecting circuit for detecting an electric power which is generated in the electrical-mechanical transducing element through the directional coupling circuit.

Abstract: A dropout compensation circuit for a video reproduction system includes a signal generating circuit for generating sum and difference signals corresponding to the sum and difference of the input chrominance and luminance signals, and for adding the difference and sum signals, after delaying the difference signal by one horizontal scanning period, to produce an output signal whose crosstalk component is eliminated, a signal separating circuit adapted to separate the chrominance and luminance signals from the delayed difference signal after delaying the delayed difference signal by one horizontal scanning period, and a signal selecting circuit adapted to supply the chrominance and luminance signals of the signal separating circuit to the signal generating circuit when it is determined that the reproduction signal is dropped out.

Abstract: A color separation circuit includes a comb filter for generating output signals corresponding to the sum of and difference between a composite input video signal and a signal prepared by delaying the composite input video signal by one horizontal scanning time period. The difference signal from the comb filter is sampled at timings with a phase difference of 90.degree. of a chrominance signal contained therein. By passing through a low-pass filter the signal sampled at a timing corresponding to the 33.degree. phase in each cycle of to chrominance signal, an EQ-chrominance signal is obtained. By passing through a low-pass filter the signal sampled at a timing corresponding to the 123.degree. phase in each cycle of the chrominance signal, an EI-chrominance signal is obtained.

Abstract: There is provided a double balance type switching circuit including a switching control signal generator; a first differential amplifier formed of first and second transistors; a second differential amplifier connected between the collector of the first transistor and a power supply terminal and formed of third and fourth transistors whose bases are respectively connected to the first and second output terminals of the switching control signal generator; and a third differential amplifier connected between the collector of the second transistor and the power supply terminal and formed of fifth and sixth transistors whose bases are respectively connected to the first and second output terminals of the switching control signal generator.

Abstract: A DC level clamping circuit comprising a differential amplifier circuit constituted by a pair of transistors, a signal source, a first capacitor connected between the signal source and a first input terminal of the amplifier circuit, a second capacitor connected between the ground and a second input terminal of the amplifier circuit and having substantially the same capacity as the first capacitor, a pulse generator, a DC power source and first and second switching elements. The first switching element is connected between the DC power source and the first input terminal of the amplifier circuit, and the second switching element between the DC power source and the second input terminal of the amplifier circuit. These switching elements are controlled by the pulses from the pulse generator in a similar manner.