Hewlett-packard Development Company, L.P.

Alexander Berkovich

Pavel Kisilev

Hila Nachlieli

Michael Plotkin

Haim Vladomirski

Shai Emanueli

A method of detecting streaks in printed documents comprises, with an imaging device, capturing an image of a printed document, transmitting the image data representing the printed document to a computing device, with the computing device, dividing the image data into a number of rectangles horizontally across the image data so that the rectangles overlap in the horizontal direction, and with the computing device, determining if a rectangle comprises a streak. A system for detecting and evaluating streaks in printed document comprises a printing device that prints a document based on image data received from a computing device, an imaging device that captures an image of the printed document, and a streak detector that detects streaks within the captured image of the printed document.

Detecting streaks in printed images

A method and apparatus are provided for evaluating the severity in a printed image of a repeating band print artifact. After electronically capturing the printed image, each of a plurality of patches taken from captured image is analysed to produce an artifact severity measure for the patch; an overall artifact severity value is then determined for the printed image from the patch severity measures. The analysis of each patch involves producing a spatial intensity profile across the patch substantially at right angles to an expected direction of extent of any repeating band print artifact present; a Fourier-related transform is then applied to the spatial intensity profile and the patch artifact severity measure generated by summing the resultant spatial frequency coefficients in a limited range about a frequency of interest.

Growing community of inventors

Haifa, Israel

Alexander Berkovich