Xerox Corporation

Corning Incorporated

Yeqing Zhang

Robert P Loce

Howard A Mizes

Martin Edward Banton

Beilei Xu

Michael Branciforte

Raja Bala

Jeffrey J Folkins

Leon C Williams

Helen HaeKyung Shin

Susan June Zoltner

Lalit Keshav Mestha

Zhigang Fan

Steven Jay Harrington

R Enrique Viturro

Patricia Joanne Donaldson

Luo Cheng

Wencheng Wu

Yao Rong Wang

Edul N Dalal

Ernest I Esplin

Douglas N Curry

Gaurav Sharma

Peter A Crean

Fritz F Ebner

Jeng-nan Shiau

Clara Cuciurean-Zapan

William A Fuss

Michael C Mongeon

Meng Yao

John A Durbin

Graham Stephen Pennington

Norman W Zeck

Christine Ann Steurrys

Nancy Beth Goodman

James Bruce Campbell

Bhaskar T Ramakrishnan

Steven Van Cleve Korol

George Laurens Taylor

Andrew S Yeh

James R Low

James D Buehler

Joel Chan

Lisa Marie Schmidt

David Alan Tence

Alex Scott Brougham

Ngoc-Diep Nguyen

Russell J Watt

Russell Wayne Madara

Hak Chuah Sim

Matthew Hudson Dixon

Kenneth Ralph Chamberlain

Katie Maria Teslow

Steve P Hoover

Gehl Kristine Sluder

Kelly D Sims

DiRisio Carlo Richard

Frey Julie Charmaine

Imaging-based methods for detecting defects in an extruded cellular ceramic article having a web array are disclosed. The methods may include capturing a digital image of the web array to establish an intensity-based initial web array representation. The methods also may include performing an intensity threshold process on the initial web array representation to define an intensity-based high-resolution web array representation having sub-pixel resolution, and performing piecewise cubic spline fits to define corresponding web skeletons. The method may also include comparing intensities of the high-resolution web array representation along the web skeletons to a threshold intensity to determine the defect locations and sizes. The methods can be applied to determining the size and location of skin defects as well.

Imaging-based methods for detecting and measuring defects in extruded cellular ceramic articles

An embodiment generally relates to systems and methods for determining cell phone usage automatically by individuals operating vehicles. A processing module can process multi-spectral images or videos of individuals and detect different regions in the image such as face regions, hand regions, and cell phone regions. Further, the processing module can analyze the regions based on locations and numbers of skin pixels and cell phone pixels to determine if the individual is holding his or her cell phone near his or her face. Based on the analysis, it can be determined whether the individual is operating the cell phone. Further, the analysis can yield a confidence level associated with the cell phone usage.

Systems and methods for detecting cell phone usage by a vehicle operator

A method for calibrating in situ a plurality of printheads in an imaging device has been developed. Firing signals operate a plurality of printheads to form ink test patterns on an image receiving member. Reflectance measurements of light reflected from the test patterns and optical density measurements for a portion of the patterns formed by only one printhead in the plurality of printheads are used to adjust the firing signals and enable the printheads to print within a predetermined range about an average reflectance value and a predetermined optical density.

System and method for compensating for drift in multiple printheads in an inkjet printer

In situ calibration of multiple printheads to reference ink targets

A method for process direction registration in an inkjet printer includes ejecting ink drops from a first inkjet at less than a maximum operating rate onto an image receiving surface moving in a process direction. The method includes generating image data samples of the image receiving surface including the ink drops. The method further includes identifying a center of the ink drops in the process direction with reference to the image data samples and storing a time offset value in a memory to correct an identified process direction offset between the identified center of the ink drops and another identified center of ink drops that are ejected by another inkjet.

System and method for process direction registration of inkjets in a printer operating with a high speed image receiving surface

A method of operating a printer enables the mass of the ink drops ejected by the printheads in the printer to maintained in an optimal range without measuring the drop mass being ejected by the inkjets in the printheads. After calibration of the printheads, the printheads are operated with electrical signals having different peak-to-peak voltages. The number of inoperable inkjets for each printhead is determined from image data of the ejected ink on the image receiving member and the number of inoperable inkjets for each printhead is compared to a predetermined threshold. The peak-to-peak voltage for the electrical signals used to operate a printhead is adjusted with reference to the number of inoperable inkjets and the predetermined threshold.

Method and system for adjusting printhead voltage parameters in an inkjet printer

A test pattern printed by printheads in an inkjet printer enables image analysis of the test pattern that identifies positions of the printheads and the inkjets operating in the printheads. The test pattern includes a plurality of arrangements of dashes, each arrangement of dashes having a predetermined number of rows and a predetermined number of columns, each dash in a row of dashes in the arrangement of dashes being separated by a first predetermined distance and each dash in a column of dashes in the arrangement of dashes being separated by a second predetermined distance, each dash in a column of an arrangement of dashes being ejected by a single inkjet ejector in a printhead of the inkjet printer, and a plurality of unprinted areas interspersed between the plurality of arrangements of dashes.

Test pattern effective for coarse registration of inkjet printheads and methods of analysis of image data corresponding to the test pattern in an inkjet printer

This closure provides image processing methods and apparatus for corner enhancing a digital image for rendering on an image output device. According to an exemplary method, the method determines whether or not image pixels are associated with a corner as a function of the USAN values generated for the image pixels. Subsequently, one or more pixels associated with a corner are modified to render a corner enhanced image.

SUSAN-based corner sharpening

Compensation for rendering device non-uniformities is provided for halftoned images. A spatially dependent tone reproduction curve (TRC) provides compensation values. Pixel location information is used to access TRC values. For example, the values are modification values. The modification values are added to the pixel values to generate combined values. Quantization is applied to the combined values to prepare compensated image data for rendering. For example, Rank Ordered Error Diffusion is applied to the combined values. The combined values may include diffused error from previously processed pixels. Gray values may be estimated for the respective pixels. The estimated gray values may be used to access compensation information from a TRC that is both spatially and gray value dependent. Mathematical basis decomposition is used to reduce TRC memory requirements. For example, Discrete Cosine Transformation, Singular Value Decomposition or Principal Component Analysis is used to determine a compact form for the TRC.

Uniformity compensation in halftoned images

A method enables an inkjet printing system to attenuate image noise in an image of a test strip obtained as print media bearing the test strip travels over a roller in the printing system. The method includes illuminating blank media as the media travels over a rotating member, generating electrical signals corresponding to light reflected by the blank media as the blank media travels over the rotating member, converting the electrical signals to image data of the blank media, printing a test strip on media, illuminating the media as the media on which the test strip is printed travels over the rotating member, generating electrical signals corresponding to light reflected by the media as the media on which the test strip is printed travels over the rotating member, converting the electrical signals to image data of the media on which the test strip is printed, modifying the image data of the media on which the test strip is printed with the image data of the blank media, and storing the modified image data in memory.

System and method for attenuating rotating member contamination affecting uniformity measurements in an inkjet imaging device

A method evaluates image quality in an ink printing system and generates data values for altering the operation of the ink printing system. The method includes generating an ink image on an ink image receiving member that corresponds to a digital image stored in the ink printing system, generating a scanned image signal corresponding to the ink image, generating firing signal waveform adjustments and image data adjustments with reference to the scanned image signal corresponding to the ink image, and operating a printhead in an ink imaging system with reference to the firing signal waveform adjustments and the image data adjustments.

System and method for adjusting operation of printheads in an ink printing device

A printer operating method enables a controller to identify process direction errors in an optical imaging system. The method includes identifying a printhead roll error for each printhead in a plurality of printheads in a printer, moving each printhead by an amount that corrects the printhead roll error for the corresponding printhead, generating a plurality of dashes on media with the plurality of printheads as the media moves past the plurality of printheads, identifying a position for each dash in the process direction from image data of the plurality of dashes on the media, identifying a displacement in the process direction for each optical detector in a linear array of optical detectors used to generated the image data of the plurality of dashes, the displacement being identified with reference to the identified positions for the dashes, and operating the printer to compensate for the identified displacements of the optical detectors.

Method and system for measuring and compensating for process direction artifacts in an optical imaging system in an inkjet printer

A color correction method includes for each of a plurality of color separations of a digital image, establishing a tone reproduction curve in the form of a vector. The vector is a function of a plurality of basis vectors. The basis vectors account for colorant interactions between a primary colorant with which the color separation is to be rendered and at least one secondary colorant with which at least a second of the plurality of color separations is to be rendered. The vector includes modified input values corresponding to input values for the color separation which vary, depending on the input values of at least the second color separation. For a pixel of interest in the digital image, a modified input value for the color separation which corresponds to the input value of the given color separation is identified from the vector.

Color compensation of images

A system removes a light sensor artifact from a light sensor in a printer that is used to obtain reflectance measurements from test patterns printed on an image substrate. The system includes a print head for ejecting a plurality of pixels having a first single color in a test pattern onto an image substrate, a light source for illuminating the test pattern on the image substrate with a light, a light sensor for measuring reflectance of the first portion of the test pattern with reference to a light having a color that is non-complementary to the first single color of the test pattern, measuring reflectance of the first portion of the test pattern with reference to a light that is complementary to the first single color of the test pattern, and measuring reflectance of the second portion of the test pattern with reference to the complementary light, the second portion including an area that overlaps the first portion of the test pattern, and a sensor controller configured to scale the reflectance of the first portion measured with reference to the non-complementary light to minimize a difference between the reflectance of the first portion measured with reference to the complementary light and the reflectance of the second portion measured with reference to the complementary light in the overlapped area.

System and method for calibrating a printing system to compensate for sensor artifact using non-complementary illuminations of test patterns on an image substrate

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Penfield, NY, United States of America

Yeqing Zhang