Abstract: In look-up table forming method and device, superordinate bits (4 bits) of brightness data and superordinate bits (2 bits) of each of a pair of color difference data are extracted from original image data comprising brightness data (8 bits) and a pair of color difference data (respective 8 bits) of each picture element to form entry addresses (each 8 bits) (classify the colors of an original image into 256 color blocks), a color histogram representing a frequency distribution of a color (16 bits) is formed on the basis of subordinate bits (4 bits) of the brightness data and subordinate bits (respective 6 bits) of each of the pair of the color difference data, and a color having the maximum frequency is selected as a representative color every entry address on the basis of the color histogram, thereby forming a look-up table.

Abstract: A facsimile machine including a data obtaining device which obtains a plurality of sets of own-call-number data each set of which identifies a corresponding one of a plurality of different own call numbers allotted to the facsimile machine according to a common numbering rule, each of the different own call numbers identifying the facsimile machine from other facsimile machines to which other call numbers different from the own call numbers are allotted according to the common numbering rule, a plurality of memories which are related with the different own call numbers, respectively, and in which a plurality of batches of information are stored, respectively, and a transmitter which transmits, to one of the other facsimile machines, the batch of information stored in one of the memories which corresponds to one of the different own call numbers identified by one of the sets of own-call-number data obtained by the data obtaining device.

Abstract: A circuit for error correcting a received complex data signal comprises a synchronous detector for recovering an in-phase data component from the received signal and a Hilbert transform filter for estimating the related quadrature component from the recovered in-phase data component, the recovered in-phase data component including a periodically recurring reference signal. A decision feedback loop is periodically operable in response to the reference signal for initially error correcting a selected characteristic of the received signal at a first relatively rapid rate and for subsequently error correcting the selected characteristic at a rate which is less than the first rate and which is dependent upon the estimated S/N ratio of the received signal. In one embodiment, phase errors are corrected at a rate which is also directly related to the value of the estimated quadrature component. In another embodiment, amplitude errors, e.g.

Abstract: Digital signals are generated and stored for each pixel of a frame of a preferably high definition video originated material. A computer reads the digital signals and converts them to binary image data by employing a selected look-up-table program to reassign color and black component values for each pixel. The programs applied in the component value reassignments are compiled from, and based on, comparative digital video component results of telecined film stocks' responses to selected color and grey scale gradients as charted against a selected video unit's response to the same charts under a selected number of identical lighting circumstances. The revised digital data is assembled and converted to an analog signal for a secondary modification wherein: A projector unit projects the high definition video frame through a macro lens onto a strip of exposed and processed motion picture or other photographic film of an optional grey scale gradient and thus grain pattern density.

Abstract: Protocol convertors associated with a mobile facsimile device and a fixed-end facsimile device are used to terminate the control data and image data protocols unique to each device. The protocol convertors interface with a digital RF communication system using a radio link protocol to ensure the error-free transmission of facsimile data.

Abstract: A circuit is provided for correcting an image signal received from a camera wherein the camera includes a plurality of charge coupled devices, each for providing a light signal indicative of the intensity of light incident thereon and wherein the plurality of light signals from the plurality of charge coupled devices are indicative of an image received by the camera. The correction circuit includes a gain memory for storing a plurality of gain correction factors wherein each gain correction factor is associated with a respective charge coupled device of the camera. The correction circuit further includes an offset memory for storing a plurality of offset correction factors wherein each offset correction factor is associated with a respective one of the plurality of charged coupled devices. The gain memory is responsive to a control circuit for multiplying the plurality of electric signals by the appropriate gain correction factor.

Abstract: A technique for generating a screened reproduction of an image including the steps of providing a representation of an original containing information representing the input density values of the original, storing information representing only part of at least one printing dot, and exposing a recording medium to record the image by using the stored information to compose complete printing dots depending on the input densities of the representation at the location of the printing dots. Apparatus for carrying out this and other techniques is also disclosed.

Abstract: An computer assembly having an integral video display and processor subsystem in a single enclosure is described. The assembly contains an electrically conductive safety wall inside the enclosure which separates the interior of the enclosure into a high-voltage region where the video display components are mounted, and a low-voltage region where the processor subsystem is mounted. The enclosure has a removable rear cover which allows access to the processor subsystem for upgrading memory. An electrically conductive liner is attached to the rear cover for EMI shielding of the low-voltage region.

Abstract: A method for use in a system of the type capable of manipulating digital images represented by a plurality of original image pixels is provided. In the preferred embodiment, the system has a memory for storing images and an image output terminal. Additionally, the method includes a step of deriving an intensity value for a selected output pixel in a set of output pixels from a plurality of input pixels in a set of input pixels, each of the plurality of input pixels having a corresponding intensity value contributing to the intensity value of the selected output pixel. The step of deriving the intensity value of the selected output pixel preferably comprises the steps of mapping, in the memory, the set of output pixels to the set of input pixels so that each of the plurality of input pixels is adjacent the selected output pixel, as well as reading the plurality of input pixels from the memory.

Abstract: A laser beam controller comprises a basic pulse signal generating circuit, a delay circuit, a delay control circuit, a pulse generating circuit and a laser beam generator. The basic pulse signal generating circuit generates periodically occurring basic pulse signal. The delay circuit delays the basic pulse signal. The delay control circuit controls the delay time of the basic pulse in the delay circuit according to image data. The pulse generating circuit generates an output pulse having a width corresponding to the delay time of the basic pulse signal. The laser beam generator generates a laser beam for a duration corresponding to the width of the output pulse by said pulse generating circuit. According to the controller, any desired gradation of a pixel of the image is desirably produced.

Abstract: A transmission arrangement is disclosed which facilitates compression of modem modulated facsimile signals for transmission on digital facilities. The presence of a facsimile call is detected and facsimile control messages are obtained by demodulating and interpreting the facsimile call control protocol. A controller is responsive to the obtained control messages for controlling a voiceband encoder to encode the control portion of the facsimile call and for controlling a so-called facsimile page demodulator to demodulate any facsimile page portions of the facsimile call to obtain a baseband digital bit stream. The encoded control portion of the facsimile call and the baseband digital bit stream representative of the demodulated, i.e., compressed, facsimile page portion of the facsimile call are transmitted along with control information (as side information) to a receiver.

Abstract: A color image reading apparatus includes a multi-chip image sensor having a plurality of image sensor units adapted to read a test chart comprising a color slip having a plurality of colors. A processing circuit is provided for automatically calculating color correcting coefficients, respectively, for the plurality of image sensors and storing them in memory. This will reduce problems of color reproducibility among image sensors and among image reading apparatus.

Abstract: A signal transmission system comprising an apparatus which inhibits the repeating in the opposite direction during reception and transmission of frames and which monitors the number of frames which were outputted in one direction from a repeater and the number of frames which were returned from such direction, whereby a destruction and circulation of the frame are inhibited without reducing response speed of a signal.

Abstract: A message transmission system is operative for transmitting, over a short range, information emitted by at least one transmitter to one or more receivers, the transmitter being situated in a semi-hemispherical field above the receivers. Each receiver has optics for focusing the semi-hemispherical field on multiple detector elements of an array placed in the focal plane of the optics. The elements are responsive to the transmitted signal.

Abstract: An image forming system includes a processor, a print engine and optional units. A serial signal line couples the print engine and the optional units. The processor has a command sending function of sending the print engine a command which asks the print engine whether or not the print engine can communicate with each of the optional units. The print engine has a function of managing a variety of information including data relating to status of the optional units, and a function of determining, in response to the command, as to whether each of the optional units is in a communication active state where it can communicate with the print engine on the basis of the managed information and a function of sending the processor a response which indicates information on whether each of the optional units is in the communication active state.

Abstract: A characteristics corrector in a video signal processing system is described for correcting characteristics of the video signal processing system at the time of recording and/or reproducing a video signal. The corrector includes a reference pulse generating circuit for generating reference pulses of varying amplitude corresponding to gradations from a black level to a white level of a video signal to be recorded during a blanking period of the video signal to be recorded. It further includes a pulse amplitude data generating circuit for generating quantified data used for the discrimination of the amplitudes of the reference pulses. Also, a reference data interleaving circuit is included for interleaving, as a reference data, the reference pulses and pulse amplitude data indicative of the amplitudes thereof during the blanking period.

Abstract: More efficient encoding/decoding in decomposing and recomposing a high resolution image is obtained by employing a unique prediction arrangement. The prediction arrangement determines whether high resolution pixels to be recomposed from low resolution pixels from a low resolution replica of the high resolution are so-called typically predictable or non-typically predictable by using general prediction rules. The general prediction rules are also employed to determine if any of the typically predictable high resolution pixels would be improperly recomposed. Such high resolution pixels which would be improperly recompased are identified as exceptions. It is noted that so-called supplemental information is required to properly recompose non-typically predictable pixels and typically predictable pixels which are identified as exceptions. To this end, exceptions accompany the low resolution pixel for which the corresponding high resolution pixels would otherwise be improperly recomposed.

Abstract: An image compressing device is described, which includes a circuit for dividing the binary signal into predetermined areas and for converting the binary signal into codes corresponding to predetermined patterns one for each predetermined area. It further includes a circuit for detecting a difference between the pattern corresponding to the code and the binary image signal, a multi-digit compressing circuit for compressing the code, and a binary compressing circuit for compressing the difference.

Abstract: An image reading apparatus has a CCD sensor for scanning an original image and outputting an analog image signal, an A/D converter for converting the analog image signal output from the CCD sensor into multi-value data consisting of a plurality of bits in units of pixels, and a selector for changing the number of bits of the multi-value data output from the A/D converter.

Abstract: An image reproduction apparatus capable of dividing the image of a designated area into plural areas and reproducing thus divided image on plural recording sheets, thereby allowing one to obtain a large copy when these sheets are pasted together.