Abstract: A fusing apparatus for xerographic printing includes two lamps therein. There is applied to the first lamp a first wave set and to the second lamp a second wave set, each wave set comprising a predetermined arrangement of active half-cycles for each time period. The first wave set and second wave set are related to substantially minimize simultaneous active half-cycles in each time period.

Abstract: In a system, such as in a digital copier, for classifying image data derived from an original image, the image data is classified by type. An algorithm is applied to the gray levels of pixels surrounding each pixel of interest. The algorithm determines whether a local maximum or minimum is part of an image of closely-spaced lines.

Abstract: A system for providing an output from a digital printing apparatus which is of higher resolution than the native resolution of the original image data. For a given center pixel area, image data corresponding to pixel areas generally neighboring the center pixel area are attempted to be matched to various templates which are consistent with curved lines in which resolution enhancement of the center pixel would be desirable. In a second stage of template matching, a second set of image data, corresponding to pixel areas further away from the center pixel than the first set of pixel areas, is also attempted to be matched to templates. The second stage of template matching helps to avoid resolution enhancement of image data which is related to a halftone image.

Abstract: An image sensor array includes a plurality of photosensor chips, which are butted end-to-end to form a single linear array of photosensors. Each individual chip in the array is provided with an independently-addressable output enable line and video output line. This configuration allows individual chips to be addressed to output image data at specific times and in a specific manner suitable for any kind of downstream circuitry.

Abstract: A control system for optimizing print quality in an electrophotographic printer uses a fuzzy-logic technique with only solid-area and half-tone density as control inputs, and only scorotron voltage and ROS laser power as outputs. The measured errors in solid-area and half-tone density are assigned to respective fuzzy-logic error subsets. Joint memberships of the solid-area and half-tone density error subsets are then used to derive error subsets are then used to derive correction values for laser power and scorotron voltage.

Abstract: A digital printing system includes a plurality of decomposers which operate simultaneously and independently. Each decomposer outputs page images of decomposed data at essentially random times. The page images from the decomposers are retained in a buffer until requested by a marker which controls the printer hardware. A buffer manager records where in the buffer each page image is stored, and a stream handle is assigned to every set of page images intended to form a multi-page document. When the marker requests a particular set of page images for printing, the marker invokes a stream handle. The buffer manager, receiving the stream handle, retrieves the necessary page images from recorded locations in the buffer.

Abstract: Binary digital data is rendered on a surface, such as a sheet of paper, by printing a series of color patches on the sheet, with the 1 bits rendered as color patches of a first color and the 0 bits rendered as color patches of the second color. The color patches are arranged in a predetermined order along an axis on the surface. The second color relates to the first color by a fixed relationship in color space, whereby the absolute values of the first and second colors are immaterial to a detecting apparatus. The color patches can be intermixed with areas of a third color, the third color representing an average in color space of the first color and the second color.

Abstract: A genetic algorithm-based system for selecting a solution. Means are provided for evaluating solutions according to a preselected evaluation function. A first computer generates a first population of solutions, the first population of solutions being of a first representation scheme. A second computer generates a second population of solutions, the second population of solutions being of a second representation scheme. A translator translates solutions of the second representation scheme into equivalent solutions of the first representation scheme. Means are provided for introducing solutions from the second population into the first population of solutions.

Abstract: An optical element for the transmission of a light beam moving in a scan direction in an electrophotographic printer provides real-time feedback to monitor the motion of the scan. A member elongated in the scan direction is adapted for the transmission of light therethrough in a direction transverse to the scan direction. An optical pattern along a portion of the member in the scan direction includes at least one surface for the non-transmission of light passing transverse to the scan direction.

Abstract: A system evaluates the psychological effect of an image embodied in image data. At least one subset of the image data is identified by a visually-perceptible characteristic thereof. A point-score relating to the extent of the visually-perceptible characteristic is derived from at least one visually-perceptible characteristic of the identified data. The point-score is then applied to an algorithm relating to a predetermined psychological effect.

Abstract: An apparatus is useful for positioning a substrate having an aperture therein movable in a process direction. A photodetector is disposed adjacent a first side of the substrate, in a position intersecting a path of the aperture along the process direction. A first light source point and a second light source point are positioned whereby, when the aperture is disposed between the first light source point and the second light source point and the photodetector, direct light from both the first light source point and the second light source point is capable of being detected by the photodetector. A condition detector detects a condition in which light of substantially equal intensity from the first light source point and the second light source point is detected by the photodetector.

Abstract: A two-component development unit for an electrophotographic printer includes a rotatable donor roll having a plurality of longitudinal electrodes along its circumference. A magnetic structure within the donor roll permits two-component developer to be advanced to a development zone. Adjacent electrodes on the donor roll are AC biased in opposite phases so as create a powder cloud of toner from the developer in the development zone. The magnetic structure is arranged to provide pole effects substantially immediately downstream and upstream of the development zone in the direction of motion of the donor roll.

Abstract: In a color scanner wherein a plurality of filters are selectably disposed in a light path to a sensor array, a target area of a preselected test color is provided adjacent the platen for the image to be scanned. The target area is used to determine which of the plurality of filters is disposed along the light path at a given time.