Abstract: A color processing method utilizing a plurality of devices having different color spaces as one virtual device. A scanner inquires a computer of color space and presence/absence of a color conversion function. If the computer has the color space conversion function, the scanner transmits color image data with parameters for converting the data into data of the color space of the computer. Inversely, the computer inquires the printer of color space and presence/absence of a color space conversion function. If the printer has the color space conversion function, the computer transmits color image data with parameters obtained from operation of parameters for converting the color space of the image data into the color space of the printer and the parameters received from the scanner.

Abstract: An image processing apparatus eliminates problems encountered in binarizing processing when an A/D-converted multivalued frame image is entered continuously and the image is displayed continuously on a binary-image display device. In terms of binarizing processing, the error-diffusion method provides excellent results. However, when processing according to this method is applied as is to each frame image, rapidly shifting noise is produced on the display screen owing to the A/D conversion characteristics, etc. This occurs because individual frames are binarized independently. The invention reduces the occurrence of this noise by making the present frame of data reflect the preceding frame of data, i.e., by applying hysteresis of image data of the preceding frame to image data of the present frame when the present frame is binarized.

Abstract: This invention provides a method and an apparatus for synthesizing two image signals, at least one of which is run-length coded, at a high speed.

Abstract: An image forming apparatus includes a device for setting the apparatus in a check mode to check a state of the apparatus and for selectively executing one of a plurality of check operations. In one aspect, each check operation is set using a commonly provided numeral key, and the check mode is unconditionally released using a clear key. In another aspect, one of the check modes includes a test movement of a movable member used in image formation. In still other aspects, sheet transporting operations are controlled based on the location of a sheet jam, or based on the selection of a sheet sorter. The state of each of the image formation devices is checked even if an improper state has already been detected, plural error states are repeatedly displayed in a specific order, and a display unit is commonly used.

Abstract: An image forming apparatus includes a detector for measuring the surface potential of a photosensitive member on which an electrostatic latent image is formed and a controller which regulates image formation plural times in accordance with the measured surface potential based on the length of time between image formations. In another aspect, the image forming apparatus includes a light source and a setting device for manually setting the quantity of light therefrom between a maximum and minimum value. A test sample of a predetermined optical density is arranged to be illuminated by the light source so as to produce a test light for projection onto a recording medium. A detector detects an electrical surface condition of the test-lighted recording medium. In response to the detected electrical surface conditions, and a controller regulates the image formation in accordance with the detector.

Abstract: An image processing system of the invention has a reader which reads out an image of an original, a page memory which stores image information of the original in the form of electric signals, a disk memory which stores part or all of the image information in the disk memory and also stores image processing information, an image processing section, a digitizer for the operator to input the image processing information, a CRT which displays input information or corrections in conversation language, a DMA controller, and a printer. The image processing system of the invention is capable of DMA transfer without the intermediacy of a CPU. Fewer addresses are required for readout of the image information from the memory, and high speed image processing is achieved.

Abstract: An image forming apparatus includes an image forming mechanism, an input device for setting image formation data necessary to command desired image formation, first and second displays for displaying the data input through the input device and for indicating that the apparatus is ready to form images, respectively, a starter for commanding image formation to commence, a timer, and a controller. The timer controls the first display to return the image formation data to predetermined values if the starter has not been actuated during a predetermined time interval. The controller controls the image forming mechanism to form an image according to the displayed data if the starter is actuated after the ready indication, controls the input device to allow the input of data even before the ready indication in which case the timer begins to time after the ready indication, and controls the timer to reset if new image formation data is input during the predetermined time.

Abstract: An image processing apparatus comprises a memory for dividing an input image data into a plurality of blocks and storing information on the image data of each block, a plurality of processing circuits for processing the input image data in predetermined processing methods, a plurality of delay circuits for delaying the image data processed by the processing circuits, and a selector for selecting one of the delay circuits in accordance with the output of the memory.

Abstract: An image processing system of the invention has a reader which reads out an image of an original, a page memory which stores image information of the original in the form of electric signals, a disk memory which stores part or all of the image information in the disk memory and also stores image processing information, an image processing section, a digitizer for the operator to input the image processing information, a CRT which displays input information or corrections in conversation language, a DMA controller, and a printer. The image processing system of the invention is capable of DNA transfer without the intermediacy of a CPU. Fewer addresses are required for readout of the image information from the memory, and high speed image processing is achieved.

Abstract: This invention provides a method and an apparatus for synthesizing two image signals, at least one of which is run-length coded, at a high speed.

Abstract: An image processing apparatus has analog image signal generator converter for converting an analog image signal generated by said analog image generator to a digital image signal, a comparator for comparing said image signal with a predetermined reference, and a controller for controlling the image signal in accordance with an output of the comparator to maintain a level or again of the image signal at a constant level.

Abstract: A data decoding apparatus decodes MH codes having different code lengths in real time and at high speed. The apparatus has an image memory, a tristate buffer group, a parallel to serial converter, code length and run length decode ROMs, and a PAL group if desired. The tristate buffer from which the next code is to be read out can be selected immediately after decoding a given code in accordance with the code length of the given code. The PAL group is used to detect an end of line if an error occurs in a given line. The error can be eliminated with one line.

Abstract: A color image processing system comprises a plurality of color image data generators each for generating color image data for different colors and a plurality of memories each for storing the color image data generated for each color by one of the color image data generators. A writing control device independently controls the speed at which color image data is written into respective ones of the plurality of memories. This control device includes an address counter for determining writing addresses of respective ones of the plurality of memories, a clock pulse generator, and a clock pulse control device for variably controlling the number of clock pulses supplied to the first address counter for determining the rate at which the writing addresses are determined. A read out device reads out the color image data stored in each of the memories and a recording device records the color image data for each color in response to output from the read out device.

Abstract: A binary digitizing apparatus in which the white and the black levels of the input signals are measured for determining a reference value, and thus determined reference value is used for binary digitizing the input signals.

Abstract: An image processing apparatus has analog image signal generator converter for converting an analog image signal generated by said analog image generator to a digital image signal, a comparator for comparing said image signal with a predetermined reference, and a controller for controlling the image signal in accordance with an output of the comparator to maintain a level or a gain of the image signal at a constant level.

Abstract: A data communication system with plural terminals in which efficient data communication without collision can be ensured by transferring the right of communication from one station to another in a determined procedure and by detecting a station which has joined the system at an intermediate timing by means of a particular command.

Abstract: An image reading device, comprising a circuit for adding a correction voltage to the output voltage of a solid-state imaging device and a circuit for maintaining the correction voltage so as to obtain a video signal of a constant voltage level for a given image density.

Abstract: This invention provides an image reproduction device having a horizontal coordinate memory, a vertical coordinate memory and a domain code memory which comprise respectively a RAM, horizontal and vertical counters, horizontal and vertical coordinate comparators, an addressable latch for the horizontal coordinate comparator and an addressable latch for the vertical coordinate comparator, gate circuits and an A/D converter. The image reproduction device prevents recording in black of a portion surrounding the original when the size of a recording medium is larger than that of the original, thus preventing poor appearance of the image reproduced on recording medium.

Abstract: Disclosed is an original reading device in which, of first and second areas of the portion to be read of an original to be read which adjoin each other with a boundary therebetween, the first area is projected upon a first image pick-up element by a first lens and the second area is projected upon a second image pick-up element by a second lens, whereby the first area and the second area are read by the first element and the second element, respectively. The first and second lenses are disposed at positions corresponding to positions more toward the boundary between the first and second areas than the centers of the first and second areas.

Abstract: An image signal processing apparatus provides both improved tonal rendition and resolving power by utilizing a dither matrix in which dither data indicating threshold values are formed by a dither matrix divided into plural sub-dither matrices for providing dither data arranged in a low spatial frequency and such dither data are compared with the density signals from an image.