摘要:
A method for detecting motion quality error of printed documents having text in a printing system includes: printing a document having text lines, each text line comprising a plurality of characters; scanning the printed document to generate a scanned image; detecting positions in a process direction of the printing system of one of text lines and characters in the scanned image; determining position errors in the process direction in the printed document based on the detected positions in the scanned image; determining at least one motion quality defect of the printing system in the process direction based on the determined position errors; and initiating an activity associated with said printing system in response to a motion quality error having been determined. A system for detecting motion quality error of printed documents is also disclosed.
摘要:
A system and method is provided for embedding variable advertising content into an electronic book including a receiver positioned about the electronic book and configured to receive information; a processor for determining whether one or more tags are present in the information received and a replacement module for replacing the one or more tags with the advertising content, the advertising content derived from profile data associated with a plurality of users.
摘要:
A defect once around signal time period of a defect source inherent in a marking device is determined, the defect source having one or more banding frequencies. A reference scanline time delay, which is a time between a page sync signal and a writing of a reference scanline, is determined. A test target is written, sensed and analyzed. A reference scanline phase offset of each banding frequency relative to the reference scanline is determined. A banding phase of each banding frequency is determined based at least on the defect once around signal time period, reference scanline time delay and reference scanline phase offset.
摘要:
A method of integrating multiple sampling interval image data with timing information from a defect once-around sensor and the machine page sync signals to estimate a banding profile. By augmenting the sampling interval data with the timing data, proper phasing of each frequency over each sampling interval can be maintained. Specifically, when the data over the multiple intervals is taken, the defect source once-around signal and the page sync signals are also recorded. The combination of this information allows the algorithm to extract phase and amplitude information of banding defects from the sampling intervals using a new matched-filter based parameter estimation algorithm. Estimated banding profiles are then generated from the known frequencies, and the estimated amplitude and phase values.
摘要:
An image printing system includes a print engine and a sensing system. The print engine is configured to print a marking material image on a image bearing surface. The sensing system includes a plurality of illuminators, a modulator, a sensor, and a demodulator. Each illuminator is configured to simultaneously emit a light beam at the marking material image on the image bearing surface, thereby producing reflectance from the marking material image at least in a first direction. The modulator is configured to modulate an intensity characteristic of each of the light beams emitted by the illuminators such that each light beam has a different modulated waveform characteristic, where the waveform characteristic includes at least frequency. The sensor is configured to detect the reflectance from the plurality of light beams in the first direction and output a reflectance signal. The demodulator is configured to demodulate the reflectance signal to isolate a response of the marking material image to each of the individual illuminators.
摘要:
A method of correcting periodic banding defects in a printing system is provided. The method comprises: determining a banding profile estimate; determining a compensation profile; adjusting the compensation profile based on the transfer function of a motion system and the transfer function of a printing system; waiting until a defect once-around signal returns; and applying the output of the adjustment step to a controller controlling the speed of an imaging surface.
摘要:
A defect once around signal time period of a defect source inherent in a marking device is determined, the defect source having one or more banding frequencies. A reference scanline time delay, which is a time between a page sync signal and a writing of a reference scanline, is determined. A test target is written, sensed and analyzed. A reference scanline phase offset of each banding frequency relative to the reference scanline is determined. A banding phase of each banding frequency is determined based at least on the defect once around signal time period, reference scanline time delay and reference scanline phase offset.
摘要:
A method of printing includes, on an ongoing basis, determining a print defect state of a printing system, selecting a screen which has a halftone print parameter which masks a detected print defect, such as one or more of a screen frequency parameter, a screen angle parameter, and a dot growth parameter. The method further includes printing images according to the selected halftone print parameter. Alternatively, where the printing system includes more than one marking engine, the method includes selecting a marking engine according to the determined defect states of each of the marking engines.
摘要:
A system and method for correcting a defect in an image, such as a ghost defect or a reload defect, by compensating for the defect. Various exemplary embodiments include creating a defect model with a source target function that represents a source level with respect to a target level; inputting a test image to an image path actuator; inputting an output of the image path actuator to a marking engine; creating a test output image; measuring the test data on the test output image; inputting the test measurement data obtained from the test output image to a controller; inputting state data representing a state of the imaging device to the controller; inputting previously printed images to the controller; inputting current image to the controller, outputting an image correction factor from the controller based on the test image measurement data, the state data, the previously printed images, and the current image to the image path actuator; and creating a corrected image based on the image correction factor output from the controller.
摘要:
System and methods are provided for detecting color separation misalignment in raster optical scanners. A dash minimum response curve is obtained from a plurality of minimal responses sensed from a plurality of dashes in a test pattern. The frequency of the dash minimum response curve a is used to detect skew or bow, depending on whether the frequency is a constant or a variable.