Patents by Inventor Edul N. Dalal
Edul N. Dalal has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8652574Abstract: A light-magenta radiation-curable gel ink including at least one curable monomer, at least one organic gellant, at least one photoinitiator, and a colorant. The colorant includes a magenta colorant, a hue-adjusting colorant that absorbs light having a wavelength of from about 400 to about 500 nm, and an optional shade-adjusting colorant that absorbs light having a wavelength of from about 600 to about 700 nm.Type: GrantFiled: January 19, 2010Date of Patent: February 18, 2014Assignee: Xerox CorporationInventors: Edul N. Dalal, Daryl W. Vanbesien, Karen A. Moffat, Michelle N. Chretien, Barkev Keoshkerian, Richard P. N. Veregin, Jordan H. Wosnick, Valerie M. Farrugia
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Patent number: 8652575Abstract: A light-cyan solid ink including an ink vehicle and a colorant. The colorant includes a cyan colorant, a hue-adjusting colorant that absorbs light having a wavelength of from about 500 to about 600 nm, and an optional shade-adjusting colorant that absorbs light having a wavelength of from about 400 to about 500 nm.Type: GrantFiled: January 19, 2010Date of Patent: February 18, 2014Assignee: Xerox CorporationInventors: Daryl W. Vanbesien, Edul N. Dalal, Karen A. Moffat, Raymond W. Wong, C. Geoffrey Allen, Maria Mihaela Birau, Richard P. N. Veregin, Jordan H. Wosnick, Valerie M. Farrugia
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Patent number: 8649054Abstract: A method for performing color registration on template media having template markings thereon comprises sensing the template media using a sensor to obtain first image data; printing a test pattern on the template media; sensing the template media along with the test pattern printed thereon using the sensor to obtain second image data; determining an output image data of the test pattern from the first image data, the second image data, and an estimated image data of the template media with the test pattern printed thereon; determining process direction and cross-process direction misregistrations from the output image data; and adjusting printheads based on the process direction and the cross-process direction misregistrations to provide adjusted color registration on subsequent template media. The estimated image data is representative of light scatter from the test pattern and light absorption by the test pattern.Type: GrantFiled: May 3, 2010Date of Patent: February 11, 2014Assignee: Xerox CorporationInventors: Wencheng Wu, Edul N. Dalal
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Publication number: 20140002661Abstract: A method for detecting camera degradation and faults comprises identifying a plurality of cameras comprising a camera network, collecting at least one system metric indicative of the camera's performance, analyzing the system metrics according to at least one of a plurality diagnostics layers comprising an individual diagnostic layer, a network diagnostic layer, and a pair diagnostic layer, and identifying a fault condition indicative of a faulty camera in the camera network according to the diagnostic layers.Type: ApplicationFiled: June 29, 2012Publication date: January 2, 2014Applicant: XEROX CORPORATIONInventors: Wencheng Wu, Edul N. Dalal
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Publication number: 20130343645Abstract: When an imaging device receives an image file that includes a color barcode, a processor of the imaging device and/or a remote processor may decode the barcode by identifying informational elements and calibration elements in the barcode. When the calibration elements are detected, one or more color model parameters are determined, and a color model is developed. When an informational element is then detected, a color value is determined for the informational element, the color model is applied using the color model parameters to yield an adjusted color value for the informational element, and the adjusted color value is used to decode the color barcode.Type: ApplicationFiled: June 26, 2012Publication date: December 26, 2013Applicant: XEROX CORPORATIONInventors: Edul N. Dalal, Wencheng Wu
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Publication number: 20130340639Abstract: An approach is provided for generating a printing member. The approach involves determining one or more image areas associated with printing one or more images, the one or more image areas being positioned on a surface of a substrate. The approach also involves determining a liquid interaction behavior of at least the surface of substrate is one of hydrophobic or hydrophilic. The approach further involves causing, at least in part, a substance that is the other of the determined liquid interaction behavior of the surface of the substrate to be applied to the one or more image areas on the surface of the substrate by a jetting process. In one embodiment, the printing member is mounted inside a printing system when the substance is applied. In one embodiment, the surface may be completely or partially cleaned and a new image created by another application of the substance.Type: ApplicationFiled: June 21, 2012Publication date: December 26, 2013Applicant: XEROX CORPORATIONInventors: Edul N. DALAL, Dan René RASMUSSEN
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Patent number: 8605268Abstract: A sensor used for determining area coverages of each colorant in a printed image is provided. The sensor includes a plurality of sensing elements for determining area coverages of each colorant in a printed image that includes a plurality of colorants including a black colorant. One of the sensing elements is an infrared sensing element configured to measure infrared reflection, and the others of the sensing elements are each configured to detect a visible color.Type: GrantFiled: March 2, 2011Date of Patent: December 10, 2013Assignee: Xerox CorporationInventors: Wencheng Wu, Edul N. Dalal, Beilei Xu
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Patent number: 8571268Abstract: What is disclosed is a novel system and method for determining printer performance in terms of image quality (IQ) on-paper using on-belt measurements. First, image noise is measured via sensing of single-separation device-dependent colors on an imaging member for a target marking device. Such single-separation device-dependent colors, in one embodiment, comprise cyan, magenta, yellow and black. A predictive correlation model is used to project the image noise of the single-separation device-dependent colors when printed on a substrate. A noise prediction model is used to estimate image noise performance values of multi-separation device-dependent colors on a substrate from the projected single-separation device-dependent colors on a substrate. In one embodiment, the predictive correlation model comprises a separation-dependent polynomial equation. The estimated image noise performance values on a substrate are used to determine image quality metric of the target marking device.Type: GrantFiled: March 19, 2010Date of Patent: October 29, 2013Assignee: Xerox CorporationInventors: Wencheng Wu, Edul N. Dalal
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Patent number: 8571269Abstract: What is disclosed is a system and method for image quality (IQ) defect detection via classification of halftone dots present on customer prints. In one embodiment, spatially-varying thresholds are applied on the sensed image in order to classify the halftone dots for IQ defect detection. The resolving power of the sensor is characterized and the sensor responses to patches printed with the print device are characterized. A de-blurring filter is designed which is appropriate for compensating the characterized resolving power of the sensor. Image enhancement is applied to the image using the de-blurring filter. Halftone dots present on the prints are classified by analyzing the enhanced image with the results of the sensor response characterization. Once classified, single separation halftone dot images can be more readily analyzed for defects. The present method allows sensor resolution as low as the size of the halftone dots of the printer under test.Type: GrantFiled: March 16, 2011Date of Patent: October 29, 2013Assignee: Xerox CorporationInventors: Wencheng Wu, Beilei Xu, Edul N. Dalal
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Publication number: 20130261960Abstract: A system and method for informing commuters of real-time time of arrival and cost information with respect to one or more routes prior to commencement of a trip. Reserved lane information (e.g., toll charge, traffic speeds in the reserved and general lanes, etc.) can be integrated with a data feed provided to, for example, navigation enabled devices such as in-car guidance systems or mobile phones. Time of arrival information with respect to the destination can be provided based on wireless data indicative of traffic conditions and highway speed limit information. Additionally, real-time toll charges can be provided to the commuter for multiple routes.Type: ApplicationFiled: March 29, 2012Publication date: October 3, 2013Applicant: XEROX CORPORATIONInventors: Wencheng Wu, Edul N. Dalal
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Patent number: 8531743Abstract: A system and method detect missing inkjets in an inkjet image generating system. The system and method generate digital images of printed documents that do not have test pattern data within them. The digital images are processed to detect light streaks and the positions of the light streaks are correlated to inkjet positions in printheads. Identification of the ink color associated with the correlated inkjet positions are obtained with analysis of color separated images and/or color errors.Type: GrantFiled: October 18, 2010Date of Patent: September 10, 2013Assignee: Xerox CorporationInventors: Wencheng Wu, Edul N. Dalal
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Patent number: 8531734Abstract: What is disclosed is a system and method for improving image quality of a color of interest using a cluster model in a color printing system involving the following. First, one or more image quality attributes are selected for a target color marking device. A cluster model is received which comprises a plurality of clusters with each cluster having an associated transform. The cluster model is used to estimate an image quality parameter. The image quality parameter is used to select colorant sets and thereby to improve the image quality in the marking device. Various embodiments of the use of cluster models are disclosed.Type: GrantFiled: February 8, 2011Date of Patent: September 10, 2013Assignee: Xerox CorporationInventors: Lalit Keshav Mestha, Edul N. Dalal, Wencheng Wu
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Patent number: 8531731Abstract: What is disclosed is a novel system and method for determining printer performance in terms of image quality defects over a large complex set of conditions based on measurements taken over a small simple set of conditions, thus reducing the amount of time, effort, and wasted paper required to obtain the data. The present system and method effectively utilizes a predictive model that predicts noise measurements of multi-separations from those of single-separation colors and/or a subset of the multi-separations. Because a model is used to comprehend color performance over the entire gamut, the number of patches is reduced. This reduction enables the method to be used within a machine to dynamically characterize the device's image quality performance. Various embodiments have been disclosed.Type: GrantFiled: March 19, 2010Date of Patent: September 10, 2013Assignee: Xerox CorporationInventors: Wencheng Wu, Edul N. Dalal
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Patent number: 8520276Abstract: Methods and systems are disclosed which are capable of efficiently performing color management of a variable gloss color printing system. The methods and systems select at least one set of the linear color values corresponding to the color profile for the printing device (at the nominal gloss condition). The linear color values selected comprise those obtained from color values corresponding to each node of the color profile at the nominal gloss condition. In a colorimetric embodiment, the linear color values can comprise: tristimulus values XYZ; red, green, blue (RGB); or luminance component Y, and two chromatic components C1 and C2 (YCC). In a reflectance embodiment, the linear color values comprise reflectance spectra. This exemplary method adds an offset term to each of the linear color values to produce a corresponding set of modified linear color values, and generates a color profile for the printing device at the desired gloss condition based on the modified linear color values.Type: GrantFiled: May 26, 2011Date of Patent: August 27, 2013Assignee: Xerox CorporationInventors: Edul N. Dalal, Wencheng Wu
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Publication number: 20130215207Abstract: An integrated apparatus comprises a sheet supply maintaining cut sheets of media and a printing device positioned to receive the cut sheets of media from the sheet supply. The sheet supply may comprise a plurality of sheet feeders. The printing device places markings on the cut sheets of media. Further, this apparatus includes an adhesive applicator positioned to apply adhesive to one side of the sheets to produce labels; and a roll apparatus maintaining a continuous supply roll of backing media. The roll apparatus is positioned to receive the labels from the adhesive applicator, and the backing media is positioned within the roll apparatus to contact the adhesive-applied side of the labels.Type: ApplicationFiled: February 17, 2012Publication date: August 22, 2013Applicant: Xerox CorporationInventors: Edul N. Dalal, Barry P. Mandel
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Publication number: 20130191014Abstract: A system and method which detects and uses a point of contact between a vehicle's tire and the pavement as a reference point to improve the accuracy of vehicle speed detection in a motorized vehicle speed detection system. In one embodiment, a plurality of infrared images of a moving vehicle are received. Each of the images is separated in time by known intervals. The images are captured using an infrared camera which can be a single-band or multi-band camera which operates in an infrared wavelength band selected to enhance a contrast between the vehicle's tires and the road surface. For each image, a point of contact is determined where a same tire contacts the road surface. These points and the time interval separations are used to calculate the vehicle's speed. An alert signal is initiated to a traffic enforcement authority if the speed exceeds the road's speed limit.Type: ApplicationFiled: January 24, 2012Publication date: July 25, 2013Applicant: XEROX CORPORATIONInventors: Edul N. Dalal, Wencheng Wu
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Patent number: 8493621Abstract: A method for optimally using color patch codes or color barcodes for transmitting machine-readable information, via device characterization, is disclosed to comprise characterizing a printing device and optionally a sensing device for identifying a number of recognizably spaced printer output colors; deriving a code book, by relating the printer output colors and their corresponding input values to information elements; and using the code book for encoding and decoding the information to be transmitted. The recognizably spaced printer output colors are in terms of a color space relevant to a color patch code or color barcode sensing device, and are related to the corresponding marking device input values.Type: GrantFiled: August 5, 2009Date of Patent: July 23, 2013Assignee: Xerox CorporationInventors: Wencheng Wu, Edul N. Dalal
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Patent number: 8488191Abstract: What is disclosed is a novel system and method for determining color profiles based upon optimizing output image spatial noise. For each of a number of selected output colors, spatial noise values for a set of device-dependent color specifications that produce the selected output color are iteratively determined. The set of device-dependent color specifications is generated by varying a subset of colorants in the device-dependent color specifications while changing the remaining colorants to maintain the selected output color. The iterative process improves the spatial noise value, as determined by a spatial noise model, of the device-dependent color specifications that correspond to the selected output color. When an optimum spatial noise value is found, the device-dependent color specification having that spatial noise value is selected as the mapping for the selected device-independent color specification. Various embodiments are disclosed.Type: GrantFiled: March 19, 2010Date of Patent: July 16, 2013Assignee: Xerox CorporationInventors: Edul N. Dalal, Wencheng Wu, Martin S. Maltz
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Patent number: 8477370Abstract: What is disclosed is a novel system and method for determining color profiles based upon optimizing image output color stability. For each of a number of selected output colors, color stability values for a set of device-dependent color specifications that produce the selected output color are iteratively determined. The set of device-dependent color specifications is generated by varying a subset of colorants in the device-dependent color specifications while changing the remaining colorants to maintain the selected output color. The iterative process improves the color stability value, as determined by a color stability model, of the device-dependent color specifications that correspond to the selected output color. When an optimum color stability value is found, the device-dependent color specification having that color stability value is selected as the mapping for the selected device-independent color specification. Various embodiments are disclosed.Type: GrantFiled: March 19, 2010Date of Patent: July 2, 2013Assignee: Xerox CorporationInventors: Edul N. Dalal, Wencheng Wu, Martin S. Maltz
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Patent number: 8477372Abstract: What is disclosed is a novel system and method for determining a printer metric in terms of image quality (IQ) over a large complex set of conditions based upon measurements taken over a small simple set of conditions while compensating for printer drift. The present system and method effectively utilizes a predictive model that predicts noise measurements of multi-separations from those of single-separation colors and/or a subset of the multi-separations. Because a model is used to comprehend the metric over the entire gamut, the number of patches is reduced. This reduction enables the method to be used within a machine to dynamically characterize the device's image quality metric. Various embodiments have been disclosed.Type: GrantFiled: May 18, 2010Date of Patent: July 2, 2013Assignee: Xerox CorporationInventors: Wencheng Wu, Edul N. Dalal