Abstract: A method of selectively assigning to a picture element to be imaged with a color reproduction system a pertinent (permanent) indication relating to the distinguishing of color with respect to picture element, wherein, on the basis of the associated parameter values related to color saturation and intensity, a choice is first made for that picture element from a permanent indication of colorlessness a permanent indication of color behavior, and a provisional indication concerning an undefined color behavior. In the case of a picture element having a provisional indication, this indication is then converted to a permanent indication on the basis of the results of an analysis of the distribution of parameter values in the color space with respect to picture elements occurring within an environment of the associated picture element. According to this method, pastel hues can be reproduced in a logical and perceptually acceptable manner despite the presence of scanner noise.

Abstract: A rotary mirror system for angularly deflecting a light beam including an air bearing arrangement rotatably supporting a mirror body on which one or more mirror facets are provided, the mirror body being the rotor of an electric motor, wherein the mirror facets are the side surfaces of an internal pyramid or frusto-pyramid formed in and opening towards one axial end surface of the mirror body and having an axis of symmetry coinciding with the rotational axis (A) of the mirror body, the orientation of the mirror facets, relative to the incoming light beam, being such that the reflected beam leaves the internal pyramid at an inclined angle with respect to the rotational axis (A).

Abstract: Texts of small fonts are made easier to read by displaying or printing background pixels in the spaces between characters within words with an adjusted grey level or color, which is a mix product of the grey level or color of the characters and that of the background.

Abstract: A method and system of determining a reference value for the intensity associated with a color indication variable and obtained by scanning an original with a color scanning unit the color scanning unit being adapted to scan the original point-by-point, the method comprising determining a locally valid reference value for each scanned point and for each color indication variable, provided the intensity value related thereto deviates from a defined standard value by less than a preset value, by adapting the then locally available reference value by using a fraction of the value representing the intensity in the case of the color indication variable concerned. For example, a white reference value (white point) can be determined for an original point by point, with the result that weak color tones which are perceived as white are also regarded as white, while in addition small variations in these weak color tones (e.g. uneven yellowing) are also noted as white.

Abstract: An apparatus for folding and depositing drawings having legends, the apparatus having two folding stations for folding drawings in two directions perpendicular to one another, and a collecting station for collecting the folded drawings with their legend on the same edge. The folding stations fold drawings of a first group, formats (A1 and A2) fed in the transverse direction, first lengthwise and then transversely, and fold drawings of a second group, formats (A0 and A3) fed in the longitudinal direction, first transversely and then lengthwise. Depending upon the group to which they belong, drawings to be folded are folded differently in the two folding stations, namely placing the folding stations selectively in operating states in which the folding stations apply each of the folds to be formed consecutively in directions which are the inverse of one another.

Abstract: To determine lexical data relating to a compound target word by reference to a vocabulary containing words with their lexical data, the vocabulary is searched for a word having a longest final part in common with the target word, the vocabulary being arranged in retrograde order for the purpose of this search process.

Abstract: To enable inflected word forms to be derived, a method and a data processing unit are provided for inflecting a given word and for adapting the lexical data of the word correspondingly by reference to a classification scheme containing inflection rules for a given natural language. The effect achieved is that inflected word forms do not have to be contained in an electronic word register, and this results in a considerable reduction in memory space occupied by the word register.

Abstract: An imaging apparatus including a transferring device for transferring a toner image from an image-forming medium to a receiving material, comprising an endless movable intermediate provided with a top layer which in a first transfer zone is in contact with the image-forming medium, heater for heating the toner image on the top layer of the intermediate, a pressure applying roller which in a second transfer zone can be brought into contact with the intermediate, a transport roller for transporting the receiving material through the second transfer zone, wherein removal of impurities transferred by receiving materials to the top layer of the intermediate is realized by absorption of the impurities by an impurity-absorbent material within the intermediate.

Abstract: A scanning head is provided suitable for scanning large-size documents including a plurality of contact type CCDs staggered on a common substrate with overlapping end portions, so that their sensitivity ranges are adjoined to one another, adjacent ends of two CCDs being fixed on the substrate by stops, and the opposite ends of these CCDs being elastically supported to allow for thermal expansion or contraction, there being interposed between the first CCD and the third CCD, a spacer which has a thermal expansion coefficient comparable to that of the CCDs, so that the sensitivity ranges of the second and third CCDs are matched to one another, irrespective of the expansion or contraction of the second CCD.

Abstract: Method and device for stapling stacks of sheets situated in bins placed one above another in parallel with a stapler movable along the bins, the stapler being rotatable about an axis of rotation so as to move the stapler at each bin from an inoperative position, in which the stapler is turned away from the bins, to an operative position, in which the stapling elements of the stapler surround an edge portion of the stack of sheets to be stapled, the stapler having a pressure surface which, during this rotatory movement, pushes to one side of an adjacent bin a stack of sheets already stapled and positioned in the adjacent bin.

Abstract: Method of processing photoelectrically scanned image information representing different gray values, before such information is converted, by half-tone processing, into image information representing no more than two gray values, such that the scanned information is distinguished into different categories of information, each category being subjected to a filtering operation determined by the category, the information thus filtered for each category being suitable for subjecting to one type of half-tone processing.

Abstract: A device for the transfer of a toner image from an image forming medium via an intermediate element to a receiving material while thoroughly cleaning the intermediate element by a combination of a first cleaning member and a second cleaning member. The first cleaning member has a surface to which toner adheres better than to the intermediate and serves for removal of high-melting impurities. The second cleaning member is cooled in such a manner that low-melting impurities, which have not been removed by the first cleaning member, are picked up by the second cleaning member.

Abstract: A multi-layered electrophotographic element providing significantly improved properties, especially for use in photocopying and printing, which comprises a conductive support carrying a photoconductive layer comprising a photoconductive charge generating layer and a charge transporting layer on the charge generating layer. The charge generating photoconductive layer comprises a mixture of charge generating perylene pigments of the following structures ##STR1## wherein the mixture of perylene pigments is selected from pigment mixtures of a perylene of structure 1 with a perylene of structure 2, pigment mixtures of perylenes of structure 1 and pigment mixtures of perylenes of structure 2.

Abstract: A printing device and a method thereof in which image data is fed to an image forming device to form an image on a photoconductive drum moving at substantially a constant speed, the image being developed and transferred to a receiving sheet, wherein a synchronization value is derived from the displacement of the receiving sheet during image transfer and the supply of image data to the image forming device is controlled by means of the synchronization value.

Abstract: In the coding of image data corresponding to a raster of pixel values, a generalized run length coding is used in respect of the difference between the pixel values in the raster line to be coded and the pixel values in the same position in the preceding raster line, such that with respect to multi-value pixels (gray values), the generalized run length coding comprises an approximation of the course of the differences as a function of the position in the raster line with a linear function and the code then contains the number of pixels and a characterization of the approximating function, and with respect to binary pixels (on/off), the length is simply a determination of the series of pixel values each equal to the pixel value in the same position in the preceding raster line, wherein in a particularly effective embodiment, this generalized run length coding with respect to the preceding line is combined with generalized run length coding of the pixel values within a line, both methods each being performed in

Abstract: An image-forming device for recording images on a dielectric surface of an image-recording medium, in which the dielectric surface is in contact, in an image-forming zone, with developing powder bound to a powder support by a magnet system, the magnet system having two oppositely magnetized areas separated by a gap and, as considered in the direction of transport of the image-recording medium, disposed consecutively, the distance between at least one of the magnetized areas and the surface of the powder support being less than 150 .mu.m and the distance between the same magnetized area and the surface of the image-recording medium being less than 600 .mu.m, thus raising the background-free level while less magnetic material is required for the magnet system than in comparable devices.

Abstract: A toner powder for the development of latent electrostatic or magnetic images, the toner powder containing a polyester resin based on an etherified diphenol and a dicarboxylic acid mixed with a reaction product of an epoxy resin and a phenol compound or a carboxylic acid, and the process for forming fixed images on an image receiving material utilizing the above toner powder, the surface of an intermediate medium consisting of material having a lower affinity for the softened toner powder than does the image receiving material and the toner powder being softened by heating before and/or during transit through a pressure zone.

Abstract: A system for selective deposition of sheets on supports situated one above the other, each such support being movable into a deposition position in which a sheet deposition device disposed at a fixed place can deposit a sheet on the associated support or on a stack of sheets situated thereon. A support situated at a higher level is movable between its deposition position in which the support or the top edge of a stack of sheets disposed thereon is at the height of the sheet deposition means, and a parking position (A) in which at a higher level than the sheet deposition device. The next lower support is movable between its deposition position in which the support or the top edge of a stack of sheets disposed thereon is at the height of the sheet deposition device, and a parking position (B) in which the top edge of a stack of sheets to be formed thereon is at a lower level than the next higher support when the latter is in the deposition position with a stack of sheets thereon.

Abstract: A raster image memory which serves as a bit-map memory for the storage of the bit representation of a whole page to be printed for a raster output scanner is connected to a raster image processor by a synchronous raster image bus having a number of data and modification code lines. Each memory element of the bit-map memory corresponds to a position on the page. The raster image processor fills the raster image memory. A logic processing unit is disposed between the raster image bus and the bit-map memory so that one input of the logic processing unit is connected to the data lines of the raster image bus and another input of the logic processing unit is connected to the data outputs of the bit-map memory. The logic processing unit is also capable of performing a number of logic operations on the data presented at the inputs of the logic processing unit in response to the signals on the modification code lines.