Abstract:
Verfahren zur Sanneransteuerung in mindestens einer Scanachse in einem Laser-Scanning-Mikroskop, wobei das Scanfeld in Teilbereiche unterteilt wird, wobei ein von einem Hinscan erzeugtes erstes Bild eines Teilbereiches mit einem von einem Rückscan erzeugten zweiten Bild des Teilbereiches verglichen wird und aus der Abweichung zwischen erstem und zweiten Bild ein Korrekturwert für die Scanneransteuerung bestimmt wird.
Abstract:
A laser beam position sensing arrangement using two similar sensors where, instead of the first sensor being aligned normal to the beam scan path, the angle which bisects the two sensors is aligned normal to the beam scan path. The average of times T1 and T2 at which the laser beam is incident the respective sensors is used for the horizontal or start of scan value, and the difference (T2-T1) is proportional to the vertical or process direction value. From the difference between the two determined times, the longitudinal beam position may be determined.
Abstract:
A media scanner (200) scans information disposed on a media (214) such as a business card or envelope. The media scanner (200) requires no moving parts and may be incorporated in a portable, hand held, battery powered information handling system such as an electronic address book or personal digital assistant. The scanner includes a scanning element such as a linear CCD (210) element for scanning the information stored on the medium, which is converted into a graphical image or text file. As the medium is fed past the scanning element, a detector detects the movement of the medium as the medium is fed through the scanner. Any variation of the movement of the medium, for example due to inconsistent movement or pausing caused by hand scanning, etc., is detected by detector (212), and scanning is executed according to the detected movement so that optimal scanning is maintained. The accommodation of the varying movement of the medium past the scanning element thereby minimizes or eliminates any errors or artefacts in the resulting scanned information (e.g., skewing) that would otherwise be caused by variable scanning movement. The detector may include an array of light detecting elements such as photodiodes or phototransistors, light detecting resistors, etc. such that light blocked from the array by the medium may be detected as a movement signal proportional to the movement of the medium. The detector may be utilized to determine the rate (relative scanning) or the position (absolute scanning) of the medium during scanning.
Abstract:
A scanning device (10) for forming a scanned electronic image (54) includes an imaging sensor (22) and at least one navigation sensor (24 and 26). The imaging sensor is a linear array of sensor elements, with a two-dimensional navigation sensor array at each end. The scanning device has three degrees of freedom, since position information from the navigation sensors allows manipulation of an image signal from the imaging sensor to reduce distortion artifacts caused by curvilinear scanning. Acceptable sources of the position information include printed matter and contrast variations dictated by variations in the inherent structure-related properties (64) of the medium (14) on which the scanned image is formed. Illumination for optimal operation of the navigation system may be introduced at a grazing angle (30) in some applications or in the normal to a plane of the original in other applications.
Abstract:
The present invention relates to a method of reconstructing an image from scanned parts of an original image obtained by relative movement between a scanning device and the original image so that adjacent scanned image swaths overlap. The scanning device comprises navigation means for determining the position of the scanning device relative to the original image. Navigation corrections are calculated by correlating features within the area of overlap between adjacent swaths.
Abstract:
PCT No. PCT/US92/04734 Sec. 371 Date Feb. 2, 1994 Sec. 102(e) Date Feb. 2, 1994 PCT Filed Jun. 5, 1992 PCT Pub. No. WO92/22109 PCT Pub. Date Dec. 10, 1992A laser beam scanning apparatus employs a movable reflector (32) having a large number of flat reflective sides (44) a deflector (16) which shifts the laser beam (10) at high speed across a plurality of the reflective sides (44). The movement of reflector (32) is synchronized with the deflection of the laser beam (10) to produce a desired scan pattern in a first scan direction (X). The reflective sides (44) of the movable reflector (32) may be angled relative to each other in a second direction (Y) to produce different scan lines thereby providing an X-Y scan pattern. The combined high speed beam deflection and motion of the reflector (32) provide scanning of the beam (10) in parallel scan segments thereby providing high scanning speed of the beam with a high degree of resolution.
Abstract:
The present invention uses a multiple line sensor array (33) for capturing the desired pixels of an object (30). Each sensor is provided with a plurality of photosensitive elements positioned substantially adjacent to each other so as to capture with multiple photosensitive elements the light from one scene pixel area of the scanned media (30). By monitoring the absolute position of the object (30), a feedback signal is generated and used to determine which photosensitive elements are sensing the desired scene pixel area thereby compensating for speed variations in the scanning motion. In another variation of the present invention a weighted average is taken of selected photosensitive elements to obtain a value for the desired scene pixel location. A summation of the signals from the lines of the sensor that are in the correct position multiplied by the correct weighting factor determined by the position sensor feedback will thereby reduce the image degradation caused by varying scanning speeds.
Abstract:
A thermal head drive circuit in which printing data PD of n bits (n is an integer of 2 or greater) are successively fed to a data input terminal, heat-generating elements (21 to 2n) of a number of n in a thermal head (1) are heated in response to the values of bits of the printing data PD to effect the printing operation, and in which prior to heating the heat-generating elements (21 to 2n) by one printing data PDk, an inverted data PDK-1 obtained by inverting a printing data PDk-1 just before the printing data PDk is supplied to the heat-generating elements (21 to 2n) to pre-heat them. There is further provided a copying machine of the manually scanning type to which the thermal head drive circuit is adapted.
Abstract:
According to an example, an apparatus for controlling a media scan operation may include a first scan module to scan a section of a media, a tracking mechanism to track the media as the media is moved past the first scan module, and a controller. The controller may receive signals corresponding to the media movement from the tracking mechanism, determine, based upon the received signals, a current position of the media, and vary a timing at which the first scan module collects a scan of the section of the media based upon the determined current position of the media.
Abstract:
The invention relates to a device and a method for exposing photosensitive plates (33) for printing presses, comprising controlled laser exposure apparatus and a conveyor system for moving forward the photosensitive plates. The problem with the plate exposers at present is that they are not sufficiently accurate. A device is therefore provided whereby the controlled laser exposure apparatus (63) comprises means (1, 20) for measuring and compensating the variances in the laser beam orientation. The controlled laser exposure apparatus (63) comprises a software control (21). Another problem is that one laser source cannot bridge the scanning of photosensitive plates (200) with great width. Two laser sources (2) synchronised with each other are therefore provided. The invention further relates to a housing for a device such as specified above.