Xerox Corporation

General Electric Company

Daniel Edgardo Viassolo

Howard A Mizes

Robert P Loce

Sridhar Adibhatla

Susan June Zoltner

Brian Francis Nestico

Brent Jerome Brunell

Lalit Keshav Mestha

Yao Rong Wang

Sudhendu Rai

Eric Michael Gross

Eric Scott Hamby

R Enrique Viturro

Michael D Thompson

Lingappa K Mestha

Matthew William Wiseman

Avinash Vinayak Taware

Sohail A Dianat

Clark V Lange

Shawn Patrick Updegraff

David Allen Gutz

Yuri Gartstein

Yeqing (Juliet) Zhang

Fei Xiao

Yequing (Juliet) Zhang

A method of generating linear models for a physical system of interest is implemented in steps including, first, determining offline, a set of linear models for the physical system of interest by linearization of a nonlinear computational model of the physical system of interest at selected operating points or from desired data; second, analyzing offline, accuracy of each linear model and eliminating inaccurate linear models therefrom to provide a residual set of linear models; third, generating offline, linear models corresponding to grid points of one or more lookup tables based on the residual set of linear models; fourth, associating offline, lookup table grid points with selected scheduling variables, and fifth, generating algorithmic software for the physical system therefrom such that linear models for the physical system generated offline form the basis for online scheduling of linear models.

Real-time scheduling of linear models for control and estimation

Engine response curves (RCs) can be used for streak compensation for printed documents. A feedback control paradigm can be included to effect RC compensation. Singular Value Decomposition (SVD) can be used to represent each RC in the collection of spatial RC data as a linear combination of basis vectors. RCs are approximated by selecting the first few basis vectors, the approximation aiding in noise rejection and reducing computation in the controller by reducing dimensionality of the RC data from gray levels to the number of SVD bases selected. An optimal subset of RCs is selectable from the set of approximated RCs by clustering the SVD weights, the clustered SVD weights producing TRCs that span all engine response RCs generated by a printer. Compensation RCs are constructible using reduced number of bases and clustered SVD weights.

Methods and systems for achieving print uniformity using reduced memory or computational requirements

A method and systems for engine control of a vehicle propulsion system are provided. The system includes a plurality of engine model modules executing independently and programmed to receive engine operating condition values from a plurality of sensors positioned on an engine wherein each of the plurality of engine model modules is programmed to determine an estimate of a process parameter of a location in the engine where a sensor is not available, not present at the location, has failed, or is determined to be inaccurate. The system also includes an estimate source selector configured to determine model blending factors and a model blending module configured to determine an estimated virtual sensor value using the determined estimates from at least two of the plurality of engine model modules and the model blending factors.

Method and systems for virtual sensor selection and blending

Methods and systems achieving print uniformity using reduced memory or computational requirements

A method for estimating an operating parameter of a turbine engine is provided. The method includes receiving at least one sensor input, calculating the operating parameter using at least the one sensor input, and determining whether an anomaly is present in the calculated operating parameter using a redundancy system. An estimated operating parameter is output.

Methods and systems for estimating operating parameters of an engine

A method and system compensates for streak defects in an image formed using a raster output scanning device. A reflectance profile is generated from an image generated by the raster output scanning device. Thereafter, a difference profile is determined. The difference profile is determined based upon the generated reflectance profile and a uniform profile. A compensation profile is generated based on the determined difference profile. The compensation profile represents a change in an intensity profile for the raster output scanning device.

System and method for compensating for streaks in images using intensity variation of raster output scanner

An image processing method to reduce streaking on a printed sheet uses a negative feedback system to reduce streaking. The method scans a printed sheet to produce image data. The method further measures gray-levels of the image data and computes a compensation vector from the measured gray-levels as the difference between a nominal tonal-resproduction-curve and local tonal-reproduction-curves. The compensation vector is applied the image data to be printed. The compensation vector emphasizes ranges of frequencies sensitive of the human eye.

Active compensation of streaks using spatial filtering and feedback control

A plurality of printing jobs associated with a printing environment can be initially evaluated. Such a printing environment can be implemented as a print shop or another lean document production environment. A set of minimal resource capacities can then be calculated as a multi-objective optimization using a linear programming (LP) analysis. Alternatively, in a generalized geometrical algorithm, at least one peak-demand production rate associated with the most critical resource can first be estimated, in response to evaluating the plurality of printing jobs. Thereafter, minimal resource capacities of the plurality of resources of the printing environment can be hierarchically calculated based on estimating the previously determined peak-demand production rate of higher priority.

Methods and systems for determining resource capabilities for a lean production environment

Systems and methods of controlling banding defects on a receiving member in an imaging or printing process using a feedback and/or feedforward control technique. In one exemplary embodiment, a method of controlling banding defects on a receiving member in an imaging or printing process includes (a) determining a toner density on the receiving member, (b) automatically determining the extent of banding on the receiving member by comparing the determined toner density to a reference toner density value, and (c) automatically adjusting the toner density based on a result obtained from the comparison of the measured toner density to the reference toner density value, automatically determining the extent of banding and automatically adjusting the toner density being performed using a feedback and/or feedforward control routine or application.

Systems and methods for correcting banding defects using feedback and/or feedforward control

A printing workflow system is utilized for coordinating production of document processing jobs among a plurality of cells, where a cell is comprised of at least one device for completing the jobs. The present invention describes the architecture of such a system, and efficient methods for generating document processing job IDs and two methods for routing and scheduling document processing jobs through the cells.

Production server architecture and methods for automated control of production document management

System and method for real-time job cell-assignment using soft-computing is provided. The system includes a work-in-progress module, a load estimation module and a fuzzy inference module. Clients send jobs to the system and the system evaluates a plurality of document processing cells' capacity to process the jobs taking into consideration the cells' current workload and the cells' capacity to process the job. Specifically, the work-in-progress module determines a work-in-progress ('WIP') value for each cell that represents a current workload, and the load estimation module estimates a load value that represents how busy the cell is for jobs of a certain type. The fuzzy inference module applies the WIP and the estimated load values to a set of membership functions to associate the values with fuzzy values. The module determines merit values for the cells using the fuzzy values, and selects the cell having the largest merit value to route the job to.

System and method for real-time assignment of jobs to production cells

A method of adjusting print uniformity in a xerographic device is provided. The method includes: a) printing a test pattern, b) transferring the printed test pattern to a scanner, c) scanning the printed test pattern and detecting line information, d) communicating the detected information to a computer, e) determining measurements from the detected line information, f) calculating the difference between the measurements and target values, and g) depending on the difference, adjusting a current supplied to an individual LED of an LED printbar associated with the measurement to reduce the difference. In one aspect, a test pattern line is associated with an individual LED. In another aspect, test pattern lines are associated with two adjacent LEDs and three adjacent LEDs. In yet another aspect, the test pattern includes dotted lines. In still another aspect, the invention includes a xerographic device with an LED printbar, a computer, and a scanner device.

Method of adjusting print uniformity

This invention provides an iteratively clustered interpolation (ICI) algorithm for use with irregularly sampled color data to develop a structured inverse. This algorithm improves device independent color across devices, such as, for example, printers, scanners and displays.

Iteratively clustered interpolation for geometrical interpolation of an irregularly spaced multidimensional color space

An LED-based spectrophotometer uses a reconstruction algorithm, based on spectral information of an illumination source and a reference spectrophotometer, to convert integrated multiple illuminant measurements from a non-fully illuminant populated color sensor into a fully populated spectral curve using a reference database. A non-linear model, such as a fuzzy inference system (FIS), is used to reconstruct spectra.

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Schenectady, NY, United States of America

Daniel Edgardo Viassolo