Hewlett-packard Development Company, L.p.

Hewlett-packard Company

Curtis J Behrend

Jeffrey C Madsen

Long C Doan

Kyi Thu Maung

Thaddie Natalaray

Kevin Lo

Arthur H Barnes

Robert Warren Beauchamp

Robert D Haselby

Jack H Schmidt

Keng Leong Ng

Matthew Douglas Reier

Patrick J Chase

Morad M Samii

Gareth Ryan Kelly

Stephane Belmon

James C Albritton-Mcdonald

U Kyaw Thu Ra

Keng-Leong Ng

Jim Albritton-Mcdonald

Tok Wee Hien

Jeoffrey Goh

Yeo Meng Hui

Hin Peng Teoh

Lam Siew Hong

Jeoffrey Goh Choon Kiat

Thong Wei Leong

Chiam Ter Wei

According to an example, a scanner apparatus may include a housing, a scan panel positioned on the housing and a lid rotatably mounted to the housing. The lid may be moved between a closed position and an open position, in which in the closed position, the lid covers the scan panel and in the open position, the lid is extended away from the scan panel. The scanner apparatus may also include an optical sensor to detect media placed on the scan panel and a media engine to determine whether the optical sensor has detected a media on the scan panel while the lid is in the open position.

Scanner apparatus having an optical sensor

A scanner assembly includes an automatic document feeder and a first scanner. The automatic document feeder defines a media pathway that includes an input portion and an output portion having an exit roller. The first scanner is positioned along the media pathway upstream from the exit roller. In a first assembled configuration, the assembly is configured to scan both a first side and a second side of the media via the first scanner. In a second assembled configuration, the assembly additionally includes a second scanner positioned along the output portion and interposed between the first scanner and the exit roller. In the second configuration, the assembly is configured to scan the first side of media via the first scanner and to scan the second side of media via the second scanner.

Configurable scanner assembly

An automatic document feeding device including a pick motor coupled with a pick assembly, a deskew motor coupled with a deskew assembly, a sensor assembly coupled with a main media path and the deskew motor, and a feed motor coupled with a feed assembly. The deskew motor drives the deskew assembly, the deskew assembly deskewing the media sheet and moving the media sheet from the pick assembly to the feed assembly, the deskew assembly moving independently of the pick assembly and the feed assembly. The sensor assembly includes a plurality of sensors. The sensor assembly senses the media sheet moving along the main media path and sends at least one signal to a computer. The computer, based on the at least one signal, sends, an activation signal to at least one of the pick, deskew and feed motors and the first scanner.

Automatic document feeder

A method for rendering an image for a staggered color graphics display comprises calculating first and second color values for each pixel or dot. The first color value is based on a portion of the image corresponding to a first dot, and the second color value is based on a portion of the image corresponding to at least one dot adjacent to the first dot. The method further includes calculating a rendered value from the first and second color values for display in the first dot.

Method and device for rendering an image for a staggered color graphics display

A computerized methodology for reducing swath scanner swath boundary discontinuities is provided by using a predetermined overlap of pixel rows during each sequential scan. Pixel data from a first scan of the overlapped pixel rows is compared to the pixel data from a second scan of the overlapped pixel rows, identical pixels of the overlapped pixel rows ideally having the same representative scan data. Errors are compensated by weighting representative scan data for each pixel row, linearly decreasing the weighting in proportion to the proximity to the swath boundary. In one embodiment, the weighting factor is an increase or decrease in the first scan data relative to the percent change in white level intensity captured in the second scan of the overlapped pixel rows. In another embodiment, the weighting factor is a linear shifting of the proportion of the pixel data from the first scan and the pixel data from the second scan of the overlapped pixel rows used as the scanned image data such that the proportion of the first scan decreases as the proportion of the second scan increases, thereby smoothing differentials in data representative of individual pixel rows at swath boundaries. In another embodiment, scanner signal-to-noise ratio is improved by using a weighting factor in accordance with the Central Limit Theorem.

Pixel weighted transition scanning to ameliorate swath scanner banding

Scan exposure in a row or swath scanner is controlled by pulsing light sources with pulses that are separated by dark intervals from each other--and from the detector readout periods. Detector sequencing is thereby made independent of the velocity of the pixel-line advance mechanism. Different pulse widths for different colors provide color correction without calculation, or regularize color-space conversion calculations where needed. In a swath scanner, known technology of printing modes is imported into the scanning context. Order of pixel columns within each swath is reversed for printing--permitting use of novel configurations such as a dual-parallel-flatbed copier in which a single common scan-and-advance mechanism simultaneously transports the scan sensor and printheads. To produce mirror images, this configuration is also used without column reversal. In addition to red, green and blue light sources, an infrared source is used for reading invisible indicia that identify forms or media types. The scan sensor is also used for auxiliary printing functions.

Underpulsed scanner with variable scan speed, P. W. M. color balance,

Growing community of inventors

San Diego, CA, United States of America

Curtis J Behrend