Abstract:
An image forming apparatus containing a divisional scanning type optical scanner. In the apparatus, if displacement of one line in a subscanning direction occurs in a joint of image formation areas, light sources are controlled so as to modulate and emit light beams based on image data of the scanning line shifted one line at the same point of time. If displacement of 0.5 pixels in a main scanning direction occurs in a joint of image formation areas, the emission start timing of one light beam is shifted by the scanning time as long as 0.5 pixels with respect to the emission start timing of the other light beam, thereby correcting the displacement amount in the main scanning direction.
Abstract:
An imaging system includes an illumination system and an optical module which are used together to scan media. The illumination system is composed of a tubular diffusion platen, a light source, and a reflector. The optical module comprises a rotating optical platen that rotates around an imaging assembly composed of a lens array, an optical element, a linear sensor array, an interconnect circuit, and a housing. The optical platen is transparent to allow the imaging assembly to capture and image of the transparent media and functions to accurately locate the transparent media in the optimal focus plane.
Abstract:
An image joining method for a scanner that scans and transfers image data to a terminal is provided. During scanning and data transfer, when the image data stored in a register is full, an image processor stops the scanning of a linear photodetector. Meanwhile, a matrix photodetector fetches and stores the image of a code strip. Then, the photodetectors are moved backward a distance larger than that being required to be accelerated forward when the scanner resumes scanning. After the data in the register being transferred and cleared, the linear photodetector resumes scanning at a normal moving speed. The code strip image is further fetched and compared with the stored one to get a joining point of scanned image data. By the joining point, the new and prior image data portions are joined and the scanning proceeds, and joined image data will not be overlapped or broken.
Abstract:
An image sensor controller and methods achieve faster image reading speeds by controlling the frequency of image sensor transfer clocks null1, null2 in accordance with the particular output period. Such an image sensor controller includes a drive controller that supplies to a transfer section of the image sensor transfer clocks null1, null2 whose clock frequency during dummy pixel output periods is faster than it is during an effective pixel output period, or whose clock frequency during non-reading pixel output periods is faster than it is during a reading pixel output period. A pattern selector selects among clock patterns in a table for setting null1, null2 according to the output periods of the image sensor. Even when the clock frequency of null1, null2 changes, a transfer clock ADCK signal can be supplied at a constant clock frequency to an A/D converter.
Abstract:
A segmented photosensor array for an image scanner has segments with imperfect alignment. During scanner manufacturing, photosensor segment alignment data, such as segment position offset and segment angle, is measured. The offset and angle are stored in non-volatile memory within the scanner. A position correction system uses the stored alignment data to correct position and angle values before being processed by a rectification system. Most pixels require simple geometry calculations. However, a more complex state machine is needed to handle the transition from one photosensor segment to the next. Correcting for segment position offset and angle errors enables a cost reduction for the sensor array and, in particular, reduces costs associated with scrap.
Abstract:
An image processor which corrects tilt of an input image without operator intervention. Projections of two partial images of an original are obtained at check points determined from input image information. A tilt angle of the original is obtained from a correction position of the projections of each partial area. The image is divided into belt-shaped small areas and shifted in accordance with the obtained tilt angle to form an image in which the tilt of the input image is corrected.
Abstract:
A color image is formed by a color printer by superposing images of a plurality of colors formed by a plurality of print units. A discrimination signal which represent character edge is received besides image data. The print positions of the print units are corrected according to image distortion detected by a sensor, and the image data are corrected according to corrected print position data. Further, the discrimination signal of character edge is corrected according to the detected image distortion. A color image is formed based on the corrected image data and the discrimination signal of character edge.
Abstract:
In a method for engraving printing cylinders for rotogravure in an electronic engraving machine, at least two engraving lanes with predetermined lane widths lying side-by-side in an axial direction of the printing cylinder are engraved with a respectively allocated engraving element. Before the engraving, an axial reference position is predetermined for each engraving element, the axial spacings thereof relative to one another corresponding to the predetermined lane widths of the engraving lanes. The engraving elements are roughly positioned to their reference positions. Subsequently, the axial spacing errors between the reference positions and the actual position of the engraving element the rough positions are measured. During engraving, the engraving elements are moved along the printing cylinder with the faulty spacings relative to one another caused by their rough positioning. The spacing errors are compensated by a shifted engraving of the engraving lanes on the printing cylinder such that the engraving lanes exhibit the predetermined lane widths despite the incorrect spacings of the engraving elements relative to one another.
Abstract:
A method of reconstructing an image captured as a stream of image data, for example as input received from a linear sensor in unconstrained scanning, comprises reconstructing the image in the form of a plurality of tiles. Each tile comprises a pixel grid of predetermined dimension representing a specific spatial region of the image. The tiles tessellate a rectilinear image space. Tiles can be created when required and compressed when no longer active, thus minimizing memory requirements. Devices utilizing this method are provided. The method is especially appropriate for use in an unconstrained hand scanner, but can also be applied to panoramic capture with a digital camera.
Abstract:
A light scanning device deflects a plurality of light beams by a deflecting means performs divided scanning on a single scanning line on a photoconductor with the plurality of deflected light beams. When the scanning line is scanned, a detecting means detects a light beam passing through a predetermined position in front of a position where the light beam first strikes an image forming range on the photoconductor. An oscillating means oscillates a specified number of clocks in a time interval from when the light beam is detected by the detecting means until it is detected thereby again. An adjusting means makes adjustments so as to irradiate a plurality of light beams based on clocks oscillated by the oscillating means. In a time interval after the light beam is detected by the detecting means until it is detected thereby again, a plurality of light beams are irradiated based on the specified number of clocks. Therefore, even if unevenness occurs in the deflecting speed of the deflecting means, dots can be formed at the same intervals in scanning a plurality of scanning lines. Thus, it is possible to prevent discontinuous joints occurring in each of the images formed with a plurality of light beams.