Abstract: A laser transmitter utilizes a laser diode which is biased to its stimulated (laser) emission mode of operation by the application of current from a source of one or more operating voltages. The failure of any of these voltages and over temperature conditions of the laser are detected by an optical AND gate which switches the operating voltage off when any one of them is absent. The temperature of the laser is also detected and applied to one of the optos in the chain of the AND gate such that an over temperature condition also results in the switching off of the operating voltage and shut down of the laser. The temperature detection is by way of a circuit having hysteresis such that the optical AND gate is not enabled until the temperature the laser decreases below the initial cut off temperature. Operating current for biasing the laser for laser emission is applied gradually over a period from one to five seconds by connecting the switched operating voltage source to the laser through a slow start circuit.
Abstract: A telematic terminal generally used for a group 4 facsimile apparatus which produces a mixed mode document and transmits to another communication apparatus. The mixed mode document is divided into a plurality of blocks and each block of mixed mode document is judged to be constructed with a normal format or abnormal format. Since the block constructed with the abnormal format is indicated on a screen of a display unit of the telematic terminal and what kind of abnormal format the other communication apparatus can manage is transmitted, the operator can easily learn whether or not the mixed mode document can be properly transmitted to the other communication apparatus. If necessary, the operator can edit the block so that the other communication apparatus can receive the mixed mode document.
Abstract: An image processing device for converting a scanned image into a monochrome image includes a scanner for providing an image signal which is applied to a sampling and holding circuit. The output of the scanning and holding circuit is supplied to a peak hold circuit and to a comparator. The output of the peak hold circuit is also applied to the comparator and the output of the comparator is supplied to a D-type flip flop circuit, the output of which is fed back to the input to the comparator from the scanning and holding circuit. The D-type flip flop generates an alteration of black and white level signals when the output from the sampling and holding circuit is close to the threshold level whereby a printer will print alterations of black and white dots.
Abstract: A CRT display unit provides for reduced electromagnetic radiation emission by encasing a video amplifier for amplifying image signals sent from a computer and a CRT device for displaying the amplified image signals within a chassis; coating conductive films on the external and internal surfaces of the funnel section of the CRT envelope; covering the circumference of the panel section with a metal rim band; fastening the envelope to the chassis via metal fixtures installed on the rim band; electrically connecting the conductive film coated on the external surface to the rim band by means of a first conductive member; and electrically connecting the space between the rim band on the panel section fastened to the chassis via metal fixtures and the chassis using a second conductive member.
Abstract: There is disclosed an image forming apparatus for generating a printing signal having a pulse width according to image density data corresponding to an image to be formed and forming dot images on a paper, each dot image having a size corresponding to the pulse width. An integrating circuit integrates the image density data for a predetermined integration period and outputting integrated image density data, and a comparator compares the integrated image density data with a predetermined threshold data and generating a printing signal having a pulse width corresponding to the comparison result thereof.
Abstract: An image processing apparatus for processing a digital color signal, given from outside the image processing apparatus, into a digital color recording signal, comprising; a color code generator for generating a color code signal representing a color of a digital pixel image signal, and a color reproduction unit for generating a color recording signal by processing another digital pixel image signal, in which these two digital pixel image signals are processed separately.
Abstract: An exposure control device includes an area setting circuit which sets a light measuring area on a part of an image sensing plane; a judging circuit which detects a back light image plane on the basis of a difference in level between video signals corresponding to the inside and the outside of the light measuring area; a high luminance detecting circuit which detects a high luminance part of the image sensing plane on the basis of the video signals; and a control circuit arranged to have the light measuring area set on the image sensing plane excluding the high luminance part from the light measuring area by controlling the area setting circuit on the basis of the output of the high luminance detection circuit when the image sensing plane is judged to be a back light image plane by the judging circuit.
Abstract: In the apparatus described in the present invention, a control circuit substrate is arranged on the bottom portion of the apparatus body, a bottom cover capable of opening and closing the bottom portion of the apparatus serves as a support member, input/output terminals for lines to be connected to the control circuit substrate are positioned at the side of the apparatus body, and retaining frames for the input/output terminals are integrally formed with the bottom cover so as to constitute a part of the side wall of the apparatus body.
Abstract: A block judgment section judges whether a subject block including a plurality of subject pixels is a white block, a black character block or a graphic/color block, on the basis of the frequency of white subject pixels and the density distribution of grey subject pixels. A macro-correction section corrects a judgment value of a character block to that of a graphic block, or vice versa on the basis of a first judgment whether there exists a graphic area larger than a predetermined size in the blocks surrounding the subject block, and a second judgment on the ratio between character blocks and graphic blocks in the blocks directly adjoining the subject block. The macro-corrected judgment value of the subject block is used to select image data of a development color or colors required for reproducing the subject block.
Abstract: A raster output scanner interface apparatus for receiving subpixel address data and pixel video data that are synchronized with a raster output scanner on a pixel basis, and for sending video output to the raster output scanner that is synchronized with the raster output scanner on a pixel basis. The apparatus provides a programmable switch that receives as inputs both the pixel video data and the pixel video data delayed a programmable amount by a programmable delay buffer. The output of the switch is the video output that is sent to the raster output scanner. The amount of delay of the programmable buffer is programmed by a controller in response to the subpixel address data. The controller also controls the switch in response to the subpixel address data and the pixel video data.
Abstract: A real time automated interactive mass communications system provides communications between a central communications processor and groups of subscribers. Typically, each group is associated with a central office. A set of local communication processors are provided, each being in two-way communication with the central processor and each being linked to one of the central offices and being preferably on site. Each local communication processor includes a processor unit, an audio controller and a set of multi-line controllers. The audio controller takes audio messages received from the central processor and generates a train or delayed set of the messages which are supplied to each of the multi-line controllers. Each multi-line controller services a set of lines connected to the central office switch, receives telephone number data from the central communication processor, and calls the list of telephone numbers to which it has been assigned.
Abstract: A facsimile machine including a reading device for reading an original image to be transmitted, a memory for storing the read image information, a transmission device for transmitting the stored image information to an external device, a timer for detecting the elapse of a prescribed time from completion of a prescribed operation of the facsimile machine, and an erasure device for erasing the stored image information in response to the detection output of the prescribed time by the timer.
Abstract: A picture element conversion system consists of a simple electric circuit for reducing or enlarging an image at high quality. The system includes a cumulative adding unit for cumulatively adding a multiplying factor, in synchronization with clock signals, and outputting the added data and a carry signal. A contiguous picture element output unit temporarily holds a picture element data array along one of two scanning directions and outputs at least two contiguous picture element data. A typical value calculation unit divides a section defined by the contiguous picture element data into sub-sections and obtains typical values corresponding to each sub-section from the picture element data output from the contiguous picture element output unit.
Abstract: A facsimile apparatus according to the present invention handles a record paper having a predetermined length (for example, the A4 size) in size in a sub-scanning direction and has a function of reducing a received picture to a preset size. When a line number of a received picture is smaller than an effective print line number of a record sheet, even if a size is set in advance for reduction, the received picture is printed on a record sheet without being reduced.
Abstract: A memory addressing method by which it is possible to write into, or read out from, a memory a plurality of kinds of image data whose pixel data are transmitted in any of two or more different orders (sequences). In this method, a parameter can be preset in correspondence to the kind of the image data, an address value is calculated for every pixel datum on the basis of the set parameter, and each of the pixel data is written or read out by using the calculated address value.
Abstract: A calibrated scanner is disclosed. The calibrated scanner includes a sensor board with a Charge Coupled Device (CCD) having two output signals. The sensor board also includes two offset devices, a coarse offset and a fine offset, the coarse offset being connected to the two output signals, the fine offset being connected to one of the output signals. The offsets are adjusted to provide a nonclipping DC bias for the two output signals. The sensor board also includes two gain devices, one gain device being attached to each output signal. The gain devices are adjusted to balance the two output signals. After these adjustments, the saturation level of the CCD is determined. The saturation level information is then used in readjusting the gain and offset devices. After this calibration, a linear correction may be applied to the output signal of the sensor board. The linear correction is accomplished by determining dark and light values of the sensor board.
February 20, 1991
Date of Patent:
April 12, 1994
Kent Johnson, Lynn L. Ackler, David C. Jenkins, Howard H. Barney, Chris A. Brooks
Abstract: A bulletin board communication resource provides a message to communication units regarding available communication systems in a particular geographic area. The bulletin board resource also supports registration of the communication unit with one or more of these systems as selected by the communication unit.
March 9, 1993
Date of Patent:
April 5, 1994
Anthony P. Van den Heuvel, Richard A. Comroe, Arun Sobti, Anthony J. Sarli, Jr.
Abstract: A periodic pulse discrimination system particularly suitable for use with electronic article surveillance systems is capable of detecting valid tag pulses while discriminating against periodic pulses caused by resonances and interfering carriers as well as random noise. Circuitry that determines the periodicity of a pulse signal and is responsive to amplitude differences between successive detected pulses controls an adaptive threshold and sampling window to discriminate against signals having an incorrect periodicity and an inadequate envelope rise time. A notch circuit notches out pulse trains that have the correct or substantially correct periodicity but persist for a longer time period than the time period required for a tag to pass through the detection zone.
Abstract: A method and an apparatus for converting the gray images inputted from the image pickup elements into binary images without losing the shape information of the gray images. The image processing method comprises the steps of obtaining the maximum values and the minimum values of the density for each horizontal scanning line and each vertical scanning line of the inputted images, obtaining the threshold values from the adjacent maximum values and minimum values, obtaining the two type binary images for each horizontal scanning line and each vertical scanning line with the threshold values, obtaining the composed binary images with the logical product or the logical sum between the respective pixels of the above two type binary images.
Abstract: In a smoke detection system, smoke density in a sampling chamber is measured by flashing a strobe light through the chamber and sensing light flux emitted from the chamber and comparing it with light flux from the strobe light itself. The measurements are performed by peak detectors which load sample-and-hold circuits to provide steady signals. The two signals are combined in mathematical manner to compensate for zero-offset and rate error between the two signals. The combined and corrected output is used to actuate a visual alarm signal, such as a segmented bargraph display to indicate air pollution. The bargraph has programming pins for tapping off each individual bargraph segment to achieve plural preset alarm thresholds.