Hewlett-packard Company

Sharp Laboratories of America, Inc

Nparbor, Inc.

David C Barton

William James Allen

Mark Gregory Hanley

Vishnu Kumar Shivaji-Rao

Vishnu-Kumar Shivaji-Rao

Vishnu-Kumar Shivaji Rao

Identifying shared events across spiking-neural-network data streams with significant stochastic content. The data streams are first subject to cross correlation. If two data streams are completely uncorrelated, the rate of occurrence, of cross-stream spike pairs, is an approximately uniform 'r_ind' across all Time Between Events (TBE's). Any shared events create a gradient, where r_ind increases to a rate “r_shr,” for any TBE's≤a Time Of Discernment (TOD). A search for the actual TOD (TOD_a) can be accomplished with a conjectured TOD (TOD_c). TOD_c is tested against an exponential decay with its rate set to a conjectured r_ind (r_ind_c). When r_ind_c=actual r_ind, equal ranges (or regions) of values, of exponential decay, represent equal probabilities. Values of TOD_c and r_ind_c are generated (at respective learning rates), until a combination is found where probabilistically equal regions receive statistically equal numbers of cross-stream events. It is then known TOD_a≤TOD_c.

Method and apparatus for shared cross-stream event detection

A multi-stream cross correlator for spiking neural networks, where each stream contains significant stochastic content. At least one event occurs, with a fixed temporal relationship across at least two streams. Each stream is treated as a Frame Of Reference (FOR), and subject to an adjustable delay based on comparison to the Other streams. For each spike of the FOR, a timing analysis, relative to the last and current FOR spikes, is completed by comparing Post and Pre accumulators. Also, a new timing analysis is begun, with the current FOR spike, by restarting the production of Post and Pre weighting functions, the values of which are accumulated, upon the occurrence of each Other spike, until a next FOR spike. A one-spike delay unit can be used, if time-neutral conflict resolution is used. The average spike rate of the FOR can be determined and used for the Post and Pre weighting functions.

Method and apparatus for cross correlation

Identifying shared events across spiking-neural-network data streams with significant stochastic content. The data streams are first subject to cross correlation. If two data streams are completely uncorrelated, the rate of occurrence, of cross-stream spike pairs, is an approximately uniform 'r_ind' across all Time Between Events (TBE's). Any shared events create a gradient, where r_ind increases to a rate 'r_shr,' for any TBE's&#x2264;a Time Of Discernment (TOD). A search for the actual TOD (TOD_a) can be accomplished with a conjectured TOD (TOD_c). TOD_c is tested against an exponential decay with its rate set to a conjectured r_ind (r_ind_c). When r_ind_c=actual r_ind, equal ranges (or regions) of values, of exponential decay, represent equal probabilities. Values of TOD_c and r_ind_c are generated (at respective learning rates), until a combination is found where probabilistically equal regions receive statistically equal numbers of cross-stream events. It is then known TOD_a&#x2264;TOD_c.

Aspects of the present invention relate to systems and methods for session synchronization between multiple devices connected to a server system.

Methods and systems for multiple-device session synchronization

Aspects of the present invention relate to systems and methods for device-independent portable session synchronization between multiple devices connected to a server system. Some aspects relate to the use of a real-time-request (RTR) database construct for managing communication between devices. Some aspects relate to management logic, which manages entries in the RTR database construct. In some aspects, database construct entries relate to device identification, session identification, device requests and device responses.

Methods and systems for device-independent portable session synchronization

Aspects of the present invention relate to systems and methods for remote monitoring and control of a content-consumption device.

Methods and systems for content-consumption device monitoring and control

In color graphics printing, incompatible inks, such as true black and color inks, tend to bleed across color field boundaries. Moreover, in four-color systems, there is a discontinuity in the physical color gamut, as distinguished from the logical color gamut, associated with the redundant color. A method is disclosed for alleviating both problems by adjusting image data prior to dithering. The method slightly shifts the logical color indicated in the image data so as to avoid the discontinuity that arises with neutral colors. Preferably, in a four-color printing system, yellow is depleted in the image data, so that after dithering, more dots of blue ink are printed in a given area than would be printed otherwise. For each pixel, the amount of correction is inversely related to the color saturation. The presence of blue ink dots within the substantially black field reduces bleed along the field edges.

Controlling ink migration and physical color gamut discontinuities in

A method for alleviating a problem in color graphics printing that incompatible inks, such as true black and color inks, tend to bleed across color field boundaries includes depletion of yellow in the image data so that more blue content is present in the image data. For each pixel, the amount of correction is inversely related to the color saturation and a corresponding correction factor related to the amount of correction is selected to be less than or equal to a preselected maximum correction factor. The presence of blue ink dots within a substantially black field, resulting from the depletion of yellow, reduces bleed along the field edges.

Method of minimizing bleeding in printed products

A method of halftoning a digital gray scale image is disclosed that utilizes a point by point thresholding comparison to a novel diagonal correlation dither matrix. The new dither matrix forces diagonal correlation of adjacent dots in the output image while maximizing dispersion of dots, thereby producing visually unobtrusive output dot patterns. The matrix is generated according to a spatial domain cost function that determines a cost value for each candidate pixel based on respective radial distances and relative angles between a candidate pixel and the ON pixels in the matrix such that unit diagonals are favored over placement of vertically or horizontally adjacent dots.

Digital halftone rendering of a gray scale image with

Ski pole cocktail pick

Digital halftone rendering of a gray scale image with frequency

Methods are disclosed for improving output image quality and reducing processing time in digital halftoning systems. The direction of processing each scan line of a source image is selected with blue noise, rather than the tradional raster scan sequence, to reduce directional and start-up anomalies. Source image pixel gray values are adjusted by means of imposed matrices, prior to error diffusion, in order to minimize distracting patterns and other anomalies in the output image. Error diffusion threshold values are modulated with blue noise, and the average threshold value reduced to reduce start-up delay. Finally, error terms in the error diffusion process are diffused according to a new three-weight filter. The three-weight filter substantially reduces error diffusion processing time, without sacrificing output image quality when used in combination with the modulated error diffusion threshold values.

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Vancouver, WA, United States of America

David C Barton