Abstract:
An image reading apparatus for reading a document such as book, constructed to detect a height of the document. A line sensor captures an image of the document and a lateral side view of the document reflected on a mirror. Then the height of the document detected by the line sensor is corrected based on a deviation between a positions of the document image projected on the line sensor and the lateral side view of the document projected on the line sensor.
Abstract:
A scanner is so arranged that a quantity of light reaching a CCD sensor can be kept constant with a change in reading position. In case a light source and a reading optical unit are driven independent of each other, variations in feed amount inevitably occur. To deal with it, a test chart of a specified length is first read to measure moving amounts of the light source and the reading optical unit. Then, the reading optical unit is moved by a predetermined amount. The light source is moved as effecting a correction based on the moving amounts initially measured. Then, a one-line reading process is carried out to scan an image on a document.
Abstract:
An image reading device moves relative to a document in a lengthwise direction of the document so as to read a document image, and is provided with first and second image sensors arranged in line in a widthwise direction of the document, each image sensor including first to n-th photoelectric conversion elements arranged in line in the widthwise direction, each photoelectric conversion element receiving reflected light from the document and generating image data corresponding to the intensity of the received reflected light, and the first photoelectric conversion element of the second image sensor positioned following the n-th photoelectric conversion element of the first image sensor; a scanner for causing the lines of photoelectric conversion elements of the respective image sensors to scan in a specified direction at a specified speed; and a data processor for processing the image data from the n-th photoelectric conversion element of the first image sensor and the image data from the first photoelectric conversion element of the second image sensor so that these image data become continuous in the lengthwise direction. Accordingly, the image reproduced from the read image data is allowed to exhibit satisfactory reproducibility and appearance.
Abstract:
Apparatus for and method of reconstructing a single document from data provided by scanning apparatus incapable of reading the entire document. A calibration sheet adapted to be disposed on the document to be scanned is used in the reconstructing apparatus. Scanning apparatus for converting a scanned portion of the document and a scanned portion of the calibration sheet into electronic outputs is used in the reconstructing apparatus. A computer processing unit is connected to the scanning apparatus to receive the electronic outputs. The computer processing unit includes storing apparatus for storing a first set of information representing a first scanned portion of the document and calibration sheet, a second set of information representing a second scanned portion of the document and calibration sheet and a third set of information representing a reconstructed single document. Also, the computer processing unit includes a converter for adjusting the first and second sets of stored information relating to the respective portions of the document scanned into alignment and spacing relative to a standard determined by the respective portions of the scanned calibration sheet and for merging the adjusted first and second sets of information to provide the third set of information.
Abstract:
A method of locating the position of an object on the platen of a raster input scanner having a movable scan carriage and an extended array of scanners is disclosed. The method includes the steps of obtaining a previously stored theoretical position of the object from a memory, locating the scan carriage at a position spaced a predetermined distance from the previously stored position, moving the scan carriage toward the previously stored position while operating at least some of the scanners until a target on the object is detected by the operating scanners, and storing a target position of the scan carriage where the target is detected. The target position can represent the location of the scanner's calibration strip or the registration position of a document. After the target position is stored, the scan carriage can be located at the target position for calibrating the scanners if the target position represents the location of the calibration strip. Alternatively, the scan carriage can be located at the target position prior to actuating the scanners for each subsequent document to be scanned if the target position represents a document registration position. This procedure is repeated to determine the document registration positions for documents which are placed on the platen manually, by an SADH or SALDH input, by a CFF input, or by an RDH input.
Abstract:
A scanner unit optically scans an original in a first direction to obtain an optical image. A mark is provided with a predetermined distance within a range in a second direction perpendicular to the first direction. The range is a range which can be scanned by the scanner unit. A line sensor is arranged in the second direction to read the optical image line by line in cooperation with the scanner unit. A converter converts a read output from the line sensor into digital data. An instruction section instructs to read the mark to the scanner unit and the line sensor prior to reading of the original. A distance calculating section calculates distance data corresponding to the predetermined distance of the mark in accordance with the digital data from the converter when the scanner unit and the line sensor cooperate to read the mark in accordance with an instruction from the instruction switch. A correction data calculating section calculates correction data corresponding to a difference between reference data and the distance data calculated by the distance calculating section. The correction data represents the number of bits of data extraction or addition corresponding to the difference. A read magnification correcting section executes bit extraction from or addition to the digital data from the converter in accordance with the number of bits represented by the correction data output from the correction data calculating section. A read magnification defined by the scanner unit and the line sensor is corrected to a defined read magnification corresponding to the reference data.
Abstract:
An adaptive image acquisition system employing a hand-held optical scanner or camera is disclosed. The system includes an adaptive camera exposure control system to adjust the camera exposure time to the media's reflectivity characteristics. The system assembles a "film-strip" of images from compressed video data, wherein redundant image data appearing in successive image frames has been removed. The system employs a correlation process between successive frames to identify the redundant frame information and determine the camera velocity. By adapting the correlation process to the velocity of the camera, the effects of variations in the velocity may be substantially eliminated.
Abstract:
In the optical information recording apparatus, the form slide film having the sensor mark is two-dimensionally scanned so as to detect the drift amount in the vertical scanning direction due to the fluctuation of the optical system of the optical information recording apparatus. The scanning device scans the sensor mark within a predetermined scanning period to produce the pulse signals. The number of these pulse signals is counted and then compared with the reference number so as to produce a difference, i.e., the drift amount. The vertical scanning pitch of the scanning device is controlled based upon the drift amount.
Abstract:
A microfilm display device is responsive to a film address signal and controlled by a microprocessor to locate a desired film and select a film image for display on a cathode-ray terminal. The film image is converted to a video signal for display on the terminal. The video signal is used for fine positioning of the raster on a flying spot scanner which illuminates the film.
Abstract:
A film card for use in an automatic microfilm display apparatus has a plurality of image frames, each bearing a marker image. One of the frames is a reference frame and includes only the marker image. The reference frame can be used for accurate positioning of a raster pattern on the remaining frames.