Xerox Corporation

Other

Thomas I Yeh

Francis Kapo Tse

George W Lahue

Ramesh Nagarajan

Aron Nacman

Barbara Lynn Farrell

Anthony Michael Frumusa

Nancy R Kelly

Kenneth D Romano

Richard S Fox

Clifford K Friend

Timothy A Cole

Andre M Blaakman

Leo R Farnand

Peter T Palamar

A method for optimizing the performance of a time-critical computation component for a real-time interactive application includes the use of an algorithm having a precise logical thread and at least one fast estimation logical thread. The computation errors generated by the fast estimation thread are imperceptible by humans and are frame specific such that the errors are corrected within a graphical frame's time by the data from the precise logical thread.

Optimization of time-critical software components for real-time interactive applications

The background grey-level of a document is determined based on the gain of the document. A histogram is generated and compressed. The standard deviation of the distribution curve of the compressed histogram is determined. A gain factor is determined using the mean and standard deviation. Using the background grey-level, the dynamic range of the document is adjusted.

Method for determining document background for adjusting the dynamic range of an image of the document

A system and process prints a high resolution image on a high addressable image output terminal by converting an image at one resolution to an image having a lower resolution in a fast-scan direction and a higher resolution in a pixel depth direction. The converted image is then processed and binarized prior to being printed on a high addressable printer. The system or process utilizes a conversion circuit which includes a two-bit per pixel packing circuit, a scanline buffer circuit, a logic circuit, and a look-up table. The conversion circuit initially converts the image into an image having a lower resolution in the fast-scan direction and a higher pixel depth resolution. Thereafter, the image is further converted to an image having a lower resolution in the slow-scan direction and a higher pixel depth resolution. This conversion of a high resolution image to a lower resolution is carried without any substantial lost to the image content data.

Method and system for performing perspective projection conversion

There is provided an image data shifting system for a document processing system including a scanning device for reading a document including one or more hardcopy pages and converting the hardcopy pages to corresponding electronic pages with each electronic page being represented by image data. Each hardcopy page is scanned as a series of scanlines and the scanner generates a signal prior to scanning each scanline. Each scanline read by the scanner is stored in memory as image data representative of one of the electronic pages. The image shifting system includes a detector for detecting a first signal generated by the scanner and a second signal generated by the scanner. The image shifting system further includes a write control system for causing a plurality of fill pixels to be written consecutively into the memory, in response to detecting the first signal, so that upon subsequently writing image data corresponding with a portion of one of the electronic pages into the memory, in response to detecting the second signal, the presence of the consecutively written fill pixels causes the image data corresponding with the portion to be shifted relative to a position that the image data corresponding with the portion originally possessed in the one of the electronic pages.

Image shifting system for use in a document processing system

An apparatus for processing an input image, represented by an input bit stream including a plurality of first bit sets, is provided. The apparatus includes a device for processing the input bit stream in such a manner that each of the first bit sets is represented by a second bit set with each of the second bit sets having less bits than each of the first bit sets and a selected number of bits in the input bit stream, corresponding to image-related information, being discarded as a result of the encoding. The apparatus is provided with an electronic volatile memory for storing a resulting encoded bit stream and a bit stream analyzer for analyzing the stored encoded bit stream to generate positional signals. The apparatus is further provided with a reconstruction circuit for reconstructing the stored encoded bit stream, by reference to the positional signals. The reconstruction circuit operates in such a manner that, upon outputting an image representation of the reconstructed bit stream, the outputted image includes at least a part of the discarded, image-related information.

Apparatus and method for encoding and reconstructing image data

A system electronically registers an image on an input document. The system includes a scanner for generating an image data stream representing an electronic image of the image on the input document and an edge detecting circuit for detecting edge data within the image data stream. A circuit calculates a skew angle of the input document based on the detected edge data and rotates the electronic image based on the calculated skew angle to register the electronic image with an output medium. The system also includes a non-image area generating circuit for generating areas in the electronic image which correspond to non-image areas based on the calculated skew and detected edge data. The skew calculation, rotation operation and the non-image area generation is based the electronic detection of the corners and center of the leading edge of the document being scanned.

Electronic image registration for a scanner

There is provided a control apparatus for a printing machine located in a building with a portion of the building being characterized by an environmental state. The printing machine includes a print machine component, while the control apparatus includes a communication line, operatively coupled with the printing machine, across which signals are transmitted. A sensing arrangement, communicating with the communication line, transmits a signal, representative of the environmental state of the building portion, across the communication line. An interface receives and converts the signal to a control signal, the control signal being used to control the print machine component.

Apparatus and method for controlling a printing machine

A system controls a transformer having a primary coil. A pulse is applied to an inverter associated with the primary coil, whereby a leading edge of the pulse creates in the primary coil a tank circuit current of an initial polarity in a tank circuit inherent to the transformer. The tank circuit is seen from an effective inductance in series with the primary coil, the effective inductance including a leakage inductance of the primary coil, and an effective capacitance in parallel with the primary coil, the effective capacitance including a parasitic capacitance of the transformer. A trailing edge of the pulse occurs when the tank circuit current is different from the initial polarity.

Control system and method for a minimizing power loss in transformer

A charging device for producing a voltage potential on a photoconductive member including a corona generator for charging a portion of the image receptor to a substantially uniform potential; a corona generating potential source electrically connected to the corona generator; a sensor for determining the potential on the image receptor; and a microprocessor including an analog to digital converter interconnected to the corona generating potential source; the sensor; and the controller for regulation of the potential on the image receptor.

Growing community of inventors

Penfield, NY, United States of America

Thomas I Yeh