Patents by Inventor Francesc Subirada
Francesc Subirada 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).
-
Patent number: 7431412Abstract: A printer device comprising a mechanism adapted to generate an image on an image surface, the device comprising a sensor adapted to image a predetermined optical object located substantially on the image surface, the device being adapted to determine at least one dimension of the object's image and thereby determine the distance separating the mechanism and the image surface.Type: GrantFiled: October 29, 2004Date of Patent: October 7, 2008Assignee: Hewlett-Packard Development Company, L.P.Inventors: Carles Flotats, David Claramunt, Jose M Rio Doval, Rodrigo Ruiz, Francesc Subirada
-
Patent number: 7417768Abstract: CDE is measured for each nozzle array, to enable modification of a mapping between input image data and intended printing marks to compensate for the CDE. Printing proceeds using the modified mapping, which is either an optical-density transformation of data to printing marks or a spatial-resolution relation between image data and intended pixel grid. The density transformation preferably includes a dither mask (but can be error-diffusion thresholding instead); the resolution relation includes scaling of image data to pixel grid. For some invention forms, CDE includes printing-density defects, measured and used to derive a correction pattern—in turn used to modify halftone thresholding. For other forms CDE includes swath-height error, but still this is measured and used to derive a correction pattern etc. For still other forms, however, CDE includes swath-height error and correction takes the form of scaling.Type: GrantFiled: October 13, 2000Date of Patent: August 26, 2008Assignee: Hewlett-Packard Development Company, L.P.Inventors: David H. Donovan, Miquel Boleda, Johan Lammens, Francesc Subirada
-
Patent number: 7413276Abstract: A diagnostic technique allows an easy visual detection of poor media advance calibration. The diagnostic technique employs a print mode that prints different areas of the plot at different passes with a controlled amount of advances between them. The dot positioning error in the different areas has a non-systematic nozzle contribution, that tends to cancel out, and a systematic contribution due to the accumulative media advance error. Different patterns can be used to make the dot positioning error due to the accumulative media advance error show up. By increasing the number of media advances between the printing of sets of pixels, e.g. pixels in a horizontal line, the effect of accumulated errors and the apparent visual effect is increased.Type: GrantFiled: August 28, 2001Date of Patent: August 19, 2008Assignee: Hewlett-Packard Development Company, L.P.Inventors: Joan Manuel Garcia, Francesc Subirada
-
Patent number: 7287824Abstract: A technique for assessing nozzle health of a printhead nozzle array in a printing system includes printing a swath portion of an image, optically scanning the printed swath portion to capture a scanned image, comparing an expected image of the swath portion of the image with the scanned image, and assessing whether any nozzles of the nozzle array have malfunctioned. A sensor can be mounted on a printhead carriage to accomplish the image capture.Type: GrantFiled: July 16, 2004Date of Patent: October 30, 2007Assignee: Hewlett-Packard Development Company, L.P.Inventors: Francesc Subirada, Joan Manuel Garcia, Santiago Garcia Reyero
-
Patent number: 7216952Abstract: A multicolor-printer has at least a first and a second print station, first and second optical sensors and a surface recordings comparator. The first and second print stations are arranged to print images on a surface of a moving recording medium. The first and second optical sensors view, at the first and second print stations, an area of the recording medium surface to obtain at least one first surface recording, in a manner related to the first print station's image printing, and second surface recordings, respectively. A storage is arranged to store the first surface recording. The surface recordings comparator is arranged to test, during the recording medium movement, for correspondence of second surface recordings with the stored first surface recording.Type: GrantFiled: July 2, 2004Date of Patent: May 15, 2007Assignee: Hewlett-Packard Development Company, L.P.Inventors: David Claramunt, Carles Flotats, Jose M Rio Doval, Rodrigo Ruiz, Francesc Subirada, Marc Jansa, Xavier Soler, Fernando Juan
-
Patent number: 7207640Abstract: When condition of a printing element (e.g. inkjet nozzle) changes, essentially full mask rows invoking the element are redone from scratch, best so as to fully satisfy pixel-grid neighbor conditions. This is faster than redoing a whole mask as in prior popup or precook /reheat methods, and yields better printouts than prior row-by-row mask revision (e.g. directly replacing a weak nozzle by a good one across whole rows). This method is best independent of prior mask versions, and uses no prebuilt matrix of backup/alternate entries. The number of rows redone is typically 7% to 14% below a nominal/baseline value.Type: GrantFiled: November 20, 2004Date of Patent: April 24, 2007Assignee: Hewlett-Packard Development Company, L.P.Inventors: Santiago Garcia Reyero, Joan-Manel Garcia, Francesc Subirada
-
Patent number: 7146049Abstract: A method for image recognition. In the method, a section of an element is imaged while the element is at a first speed to obtain a first image pattern. The section of the element is also imaged while the element is at a second speed to obtain a second image pattern. The first speed differs from the second speed. In addition, the apparent speeds of the element in the first image pattern and the second image pattern are made to appear approximately the same.Type: GrantFiled: February 28, 2003Date of Patent: December 5, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Carles Flotats, David Claramunt, Jose M Rio Doval, Rodrigo Ruiz, Francesc Subirada
-
Patent number: 7111918Abstract: A media-positioning sensor assembly in one embodiment of the invention is disclosed that includes a mechanism and a media-positioning sensor. The mechanism moves back and forth over media along a first axis. The media advances past the mechanism along a second axis perpendicular to the first axis. The media-positioning sensor is situated on the mechanism and is to detect positioning of the media relative to the mechanism along at least one of the first axis and the second axis.Type: GrantFiled: August 13, 2004Date of Patent: September 26, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Carles Flotats, David Claramunt, Jose M. Rio Doval, Rodrigo Ruiz, Francesc Subirada, Joaquim Veciana, Marc Jansa
-
Patent number: 7055925Abstract: Techniques for calibrating a scanner mounted on a scanning carriage of an image forming device. In one embodiment, a method of calibrating an optical sensor of a color image forming device includes positioning a prefabricated optical sensor target at the service area of the image forming device, the target including a plurality of target patches of predetermined different colors, moving the carriage to the service area, acquiring one or more images of the plurality of target patches, and using the one or more images to perform a plurality of calibrations of the optical sensor.Type: GrantFiled: July 31, 2003Date of Patent: June 6, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Francesc Subirada, David Gaston, Oscar Ciordia
-
Publication number: 20060109294Abstract: When condition of a printing element (e.g. inkjet nozzle) changes, essentially full mask rows invoking the element are redone from scratch, best so as to fully satisfy pixel-grid neighbor conditions. This is faster than redoing a whole mask as in prior popup or precook/reheat methods, and yields better printouts than prior row-by-row mask revision (e.g. directly replacing a weak nozzle by a good one across whole rows). This method is best independent of prior mask versions, and uses no prebuilt matrix of backup/alternate entries. The number of rows redone is typically 7% to 14% below a nominal/baseline value.Type: ApplicationFiled: November 20, 2004Publication date: May 25, 2006Inventors: Santiago Garcia-Reyero, Joan-Manel Garcia, Francesc Subirada
-
Patent number: 7034279Abstract: A method and apparatus is used to detect and compensate for printhead rotation in an inkjet printer. The detecting operation includes receiving an initial image of a pattern taken from a medium as the printhead passes over the medium, receiving a subsequent image of the pattern taken from the medium as the printhead continues to pass over the medium, comparing the initial image of the pattern and the subsequent image of the pattern taken from the medium and identifying a rotation of the printhead in the inkjet printer passing over the medium if the comparison indicates the initial image of the pattern is rotated relative to the subsequent image of the pattern. The compensation operation includes modifying the timing settings associated with the firing of the nozzles in the inkjet printhead to compensate for the rotation of the printhead.Type: GrantFiled: September 25, 2003Date of Patent: April 25, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Rodrigo Ruiz, Carles Flotats, Francesc Subirada
-
Patent number: 7027076Abstract: A sensor system for detecting skew in print media along the feed path of a hardcopy device is disclosed. In one embodiment of the invention the system is arranged to generate a first image of a portion of print media at a first position along the feed path and to generate a second image of the portion of print media at a second position along the feed path, the system is arranged to compare the first and second images and thereby detect a change in the angle of skew of the media between the first and second positions.Type: GrantFiled: July 28, 2003Date of Patent: April 11, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Rodrigo Ruiz, David Claramunt, Carles Flotats, Jose M Rio Doval, Francesc Subirada, Francisco Javier Rodriguez
-
Patent number: 7023581Abstract: To compensate for color-calibration sensor drift, a measurement of bare-print-medium tonal value is taken in immediate time juxtaposition to each color test pattern; measured bare-medium tone is then used to correct color-patch readings. A line sensor or the like, on the scanning printhead carriage, is used for the reading. Preferably two such readings are taken, one at each end of each test pattern; ideally separate scans of the bare medium are taken without any test-pattern patch to develop longterm and short-term drift profiles, for refining the corrections. To compensate for calibration error due to runout in the carriage track—particularly for wide-bed printers—sensor response to bare medium is used to represent variations in carriage-to-medium spacing along the track; these variations are corrected in later sensor use.Type: GrantFiled: July 30, 2001Date of Patent: April 4, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Pau Soler, Roger Vinas, Francisco Javier Rodriguez, Francesc Subirada
-
Publication number: 20060033769Abstract: A media-positioning sensor assembly in one embodiment of the invention is disclosed that includes a mechanism and a media-positioning sensor. The mechanism moves back and forth over media along a first axis. The media advances past the mechanism along a second axis perpendicular to the first axis. The media-positioning sensor is situated on the mechanism and is to detect positioning of the media relative to the mechanism along at least one of the first axis and the second axis.Type: ApplicationFiled: August 13, 2004Publication date: February 16, 2006Inventors: Carles Flotats, David Claramunt, Jose Rio Doval, Rodrigo Ruiz, Francesc Subirada, Joaquim Veciana, Marc Jansa
-
Publication number: 20060012806Abstract: A technique for assessing nozzle health of a printhead nozzle array in a printing system includes printing a swath portion of an image, optically scanning the printed swath portion to capture a scanned image, comparing an expected image of the swath portion of the image with the scanned image, and assessing whether any nozzles of the nozzle array have malfunctioned. A sensor can be mounted on a printhead carriage to accomplish the image capture.Type: ApplicationFiled: July 16, 2004Publication date: January 19, 2006Inventors: Francesc Subirada, Joan Garcia, Santiago Reyero
-
Publication number: 20050280665Abstract: A printer device comprising a mechanism adapted to generate an image on an image surface, the device comprising a sensor adapted to image a predetermined optical object located substantially on the image surface, the device being adapted to determine at least one dimension of the object's image and thereby determine the distance separating the mechanism and the image surface.Type: ApplicationFiled: October 29, 2004Publication date: December 22, 2005Inventors: Carles Flotats, David Claramunt, Jose Rio Doval, Rodrigo Ruiz, Francesc Subirada
-
Publication number: 20050185009Abstract: A multicolor-printer has at least a first and a second print station, first and second optical sensors and a surface recordings comparator. The first and second print stations are arranged to print images on a surface of a moving recording medium. The first and second optical sensors view, at the first and second print stations, an area of the recording medium surface to obtain at least one first surface recording, in a manner related to the first print station's image printing, and second surface recordings, respectively. A storage is arranged to store the first surface recording. The surface recordings comparator is arranged to test, during the recording medium movement, for correspondence of second surface recordings with the stored first surface recording.Type: ApplicationFiled: July 2, 2004Publication date: August 25, 2005Inventors: David Claramunt, Carles Flotats, Jose Rio Doval, Rodrigo Ruiz, Francesc Subirada, Marc Jansa, Xavier Soler, Fernando Juan
-
Patent number: 6918651Abstract: A scan axis assembly for a printer comprises first and second tracks, the tracks being rigidly located relative to one another by one or more track support members, and each track being arranged to support a print carriage such that the print carriage may move along the track to traverse a print zone.Type: GrantFiled: April 28, 2003Date of Patent: July 19, 2005Assignee: Hewlett-Packard Development Company, L.P.Inventors: Jorge Menendez, Marcelo Ymbern, Francesc Subirada
-
Patent number: 6910754Abstract: By implementation of an optical scanner, the calibration of printheads of a printing mechanism may be performed in a relatively short period of time as compared to known techniques. In one respect, the time required to perform the calibration may be substantially reduced by virtue of the relatively wide field of view of the optical scanner. The relatively wide field of view generally enables for the scanning of test patterns to be performed with a relatively fewer number of scanning passes, thus reducing the time required to perform the scanning operations as well as the calibration operations. In addition, the scanning operations may yield relatively more accurate results as compared to known scanning operations. In one respect, optical scanners are capable of detecting smaller drops of ink on print media by virtue of their higher resolution capabilities.Type: GrantFiled: October 29, 2003Date of Patent: June 28, 2005Assignee: Hewlett-Packard Development Company, L.P.Inventors: David Gaston, Francesc Subirada, Xavier Soler
-
Publication number: 20050067558Abstract: A method and apparatus is used to detect and compensate for printhead rotation in an inkjet printer. The detecting operation includes receiving an initial image of a pattern taken from a medium as the printhead passes over the medium, receiving a subsequent image of the pattern taken from the medium as the printhead continues to pass over the medium, comparing the initial image of the pattern and the subsequent image of the pattern taken from the medium and identifying a rotation of the printhead in the ink-jet printer passing over the medium if the comparison indicates the initial image of the pattern is rotated relative to the subsequent image of the pattern. The compensation operation includes modifying the timing settings associated with the firing of the nozzles in the inkjet printhead to compensate for the rotation of the printhead.Type: ApplicationFiled: September 25, 2003Publication date: March 31, 2005Inventors: Rodrigo Ruiz, Carles Flotats, Francesc Subirada