Xerox Corporation

William David Notovitz

Theresa Michelle Marconi

Xing Li

Stuart Alan Schweid

Michael John Wilsher

Aron Nacman

Timothy M Hunter

Anthony Paul Lanza

John C Guarrera

Brian Richard Caffee

Jason Roy

A scanner calibration system is provided. The scanner calibration system includes memory configured in a format to store therein encoded gain and offset parameters. Such a configuration reduces the amount of required memory for the scanner calibration system without a compromise of performance.

Reduced memory scanner calibration system and method

An embodiment generally relates to a device for rotating image tiles using line segment read buffers. The device comprises an image memory configured to store an image and a plurality of buffers, wherein the image comprises a plurality of tiles. The plurality of buffers comprises line segment read buffers configured to interface with the image memory to read line segments of the plurality of tiles from the image memory. A rotator logic module is configured to micro-rotate the line segments, aggregate the line segments as rotated tiles, and macro-rotate the rotated tiles to determine an address of the image memory at which to write the rotated tiles. Write buffers are configured to write the rotated tiles to the image memory at the determined address.

Systems, methods and devices for rotating image tiles using line segment read buffers

An embodiment generally relates a device for rotating images. The device includes an image memory configured to store an image and a plurality of buffers. The plurality of buffers are configured to interface with the image memory to read data words of the image from the image memory and to write rotated data words to the image memory. The device also includes a logic module configured to interface with the plurality of buffers and to micro-rotate and macro-rotate an image based on a selection of three orientations. The logic module is also configured to execute a read of data words from the image memory to a first buffer of the plurality of buffers, a rotation of a data word, and a write of rotated data words from a second buffer of the plurality of buffers to the image memory substantially simultaneously.

Systems, methods and devices for rotating images

A parallel, non-iterative, memory efficient method of determining image skew. A document skew angle is determined from a fast scan second order moment data set and a slow scan second order moment data set. A slow scan second order moment data set can be generated by receiving a current scanline of image data, updating columns sums for a set of rotation angles using scanlines within a buffer comprising a band having a predetermined number B of scanlines, and updating the buffer with the current scanline. A fast scan second order moment data set is generated by projecting a plurality of pixels within each scanline of image data received to a first rotation angle wherein the plurality pixels project onto M rows; updating M memory locations, wherein each one of the M memory locations corresponds to one of the M rows and wherein each memory location is updated using pixels projecting onto the corresponding row whereby one of the M memory locations contains a completed row; and adding the square of the completed row sum to a moment accumulator.

Non-iterative method of calculating image skew

Growing community of inventors

Webster, NY, United States of America

William David Notovitz