Abstract: A method whereby the image of a bar code is located in a digitized image of an object traveling along a conveyor belt; the orientation of the longitudinal axis of the code with respect to a reference system of the image is determined, and the code is scanned along lines parallel to the longitudinal axis of the code to generate respective vectors describing the pattern of the code image brightness signal along the respective line; and the vectors are digitized and projected to generate a real-number vector containing the coordinates of the brightness signal transition points indicating the shape and location of the code elements.
Abstract: A method and an apparatus for the acquisition of information assigned to objects, in particular of a bar code, are proposed and are distinguished by the fact that an optimum compromise between performance and reliability of the read operation is set and is kept constant over time.
Abstract: A method for the evaluation of information stored in bar codes composed of characters is proposed, in which the bar code is exposed to light by means of a light source and the light reflected from the bar code is detected by means of a light receiving device during a relative movement between the bar code and the light receiving device in a scanning operation. The method is distinguished by the fact that the acceleration (a) of the relative movement during the scanning operation is assumed to be constant and can assume different values.
Abstract: A hand-held reader of an optical code comprises a shell containing a mirror capable of deflecting a beam of light diffused by the optical code of a label or of a product. The mirror is mounted elastically in the shell by means of a spring element formed by a central plate capable of supporting the mirror, provided with two protruding fins. Each of the fins comprises a first portion inclined with respect to the central plate and a second portion folded over with respect to the first portion and provided with a slot capable of engaging in a disconnectable manner a projection of a supporting element integral with the shell.
Abstract: The process uses information from the scan sweeps of a laser scanner to obtain a stipulated area which approximates the top surface of the object, by successive samplings while the object is moved relative to the scanner. The volume is then obtained as the volume included between that surface and a bearing surface. The process accommodates the slope angles of the scan plane. The volume measurement may be taken at the same time as an optical code provided on the object is read.
Abstract: The process uses information from the scan sweeps of a laser scanner, and readings with a CCD reader, to obtain a series of stipulated areas corresponding to successive cross-sections of the object as reckoned by moving the object relative to the scanner and the reader. The volume is then obtained by multiplying each of said areas by the feed distance of the object. The possibility is further contemplated of accommodating the slope angles of the scan plane and the read plane, or alternatively neglecting their effects if said angles are sufficiently small. The volume measurement may be accompanied by the reading of an optical code provided on the object.
Abstract: An electro-optical device for detecting the presence of a body at an adjustable distance, with the suppression of background, comprises an emitter of a beam of light endowed with a source of a beam of direct light and with an optical transmission chamber and a receiver endowed with an optical reception chamber with a beam of reflected light and with a pair of side by side photoelectric sensors. The source of light and the pair of photoelectric sensors are integral with a supporting structure; the optical reception chamber is mobile and is rotatably supported by the supporting structure by means of pivots having axis substantially coincident with a separation area interposed between the photoelectric sensors.
Type:
Grant
Filed:
April 10, 1997
Date of Patent:
June 2, 1998
Assignee:
Datalogic S.p.A.
Inventors:
Alessandro Vezzalini, Marco Landolfi, Reiner Brandstetter
Abstract: A laser bar code scanner is disclosed using a pulse laser and phase detector for returned light to determine the distance of a bar code. Also, disclosed the use of several lasers having different focal distances with the determined distance being used to select appropriate laser to increase the working distance of the scanner.
Abstract: Bar code reader including two sources which are enabled to emit respective laser beams with a cyclic alternation; the laser beams are focused by optical elements on two different regions of a read area. Reflected rays from the read area are processed by a decoding unit operatively connected to the laser-beam sources so that when the presence of a code in the read area is detected, only the laser beam which is focused on the region in which the bar code is present remains enabled.
Abstract: A photoelectric barrier comprises an emitter emitting a movable modulated beam which scans periodically at a high rate an area to be protected. The beam is then redirected to a photoelectric receiver supplying the signal deactivating the machine controls. The barrier also comprises a circuit generating pulses which are effective to suppress some of the pulses emitted by the photoelectric emitter in order to monitor the machine operation during scanning, the suppression pulses being produced by detecting the correct rotation of the scanning motor.
Abstract: A laser bar code scanner is disclosed using a pulse laser and phase detector for returned light to determine the distance of a bar code. Also, disclosed the use of several lasers having different focal distances with the determined distance being used to select appropriate laser to increase the working distance of the scanner.