Abstract: An optoelectronic sensor for detecting objects in a detection zone is provided that comprises a light reception element for generating a received signal from light that is incident on the light reception element from the detection zone, a display device for highlighting the location of the detection zone for the human eye by a light pattern projected into the detection zone, and a control and evaluation unit for evaluating the received signal, In this respect, the light pattern has at least two partial patterns that are projected from different sources and that together mark a center of the detection zone independently of a distance into which the light pattern is projected into the detection zone.

Abstract: An apparatus (10), in particular a code reader, for the taking of undistorted images of a surface of objects (14) moved on a conveying device (12) is set forth, wherein the apparatus (10) has a geometry detection sensor (18) which is made for the detection of the geometry of the objects (14) with reference to spacing data and/or to the remission behavior of the objects (14) as well as a line sensor (20), in particular a line camera, which can scan the objects (14) linewise for the generation of image data of the surface in a linear reading window (22) which forms an angle with the conveying direction.

Abstract: An apparatus, in particular a code reader, for the recording of images of objects (14) moved on a conveyor device (12), wherein the apparatus includes a line sensor (10), in particular a line camera, which can scan objects line wise for the generation of image data of the surfaces, as well as a speed determination device (26; 30), which can determine the speed of movement of the objects (14) with respect to the line sensor (10) or their conveyed distance. At the same time an evaluation unit (26) is provided, which is adapted to match the recording frequency of the line sensor (10) to the speed of movement.

Abstract: An RFID reading apparatus (10) is provided for stationary mounting at a reading zone (18) of a conveyor (12) or of a reading portal (40) for reading out at least one RFID transponder (22) moved on the conveyor (12) or through the reading portal (40), having a receiver (32) and a plurality of antennas (24, 26) connected to the receiver (32) for receiving RFID signals from the RFID transponder (22) as well as having an evaluation unit (36) for reading out RFID information from the received RFID signals, wherein the RFID reading apparatus (10) includes a first housing (28) in which the receiver (32) and the evaluation unit (36) are accommodated. In this respect, one of the antennas is an internal antenna (24) which is mechanically fastened to the first housing (28) and another of the antennas (28) is an external antenna.

Abstract: The invention relates to an apparatus and a method for the sensing of objects moved through the field of view of an optical sensor comprising a device for the selection of regions of interest which are each associated only with a part of the field of view of the optical sensor, wherein a distance measurement device and/or a remission measurement device is/are integrated into the optical sensor or is/are connected in front of it or after it in the direction of movement of the objects, with the distance measurement device and/or the remission measurement device being designed for the determination of the spacing and/or of the remission of the object surfaces facing the distance measurement device and/or the remission measurement device and being coupled to an evaluation circuit for the calculating of the regions of interest in dependence on the determined spacings and/or remissions.

Abstract: The invention relates to a method for the correction of the brightness of a raw image generated by a sensor matrix, in which an intensity matching is carried out at picture elements defined by a line coordinate and a column coordinate and at least one intensity value. The intensity matching comprises the application to the intensity values of the picture elements to be corrected of two intensity corrections independent of one another, in dependence on the line coordinate, on the one hand, and in dependence on the column coordinate, on the other hand. The invention furthermore relates to an optoelectronic sensor comprising a correction device. This correction device is matched to carry out the initially described intensity matching.

Abstract: A code reader comprising an integrated light source for the illumination of a reading region, a sensor matrix and an optical receiving system positioned in front of the latter, wherein the light emergence surface of the light source is located in or closely in front of the depth of field zone of the optical receiving system.

Abstract: A method of detecting two-dimensional codes using a plurality of light and dark data bits arranged two-dimensionally. The method includes detecting the code as a gray scale value image, splitting the detected gray scale value image into image areas corresponding to the individual data bits, determining a binarizing threshold representing a specific gray scale value for the image areas, carrying out a respective binarizing of the gray scale value of the individual image areas by means of a binarizing threshold to produce a bit sequence which represents the data bits and consists of the values 0 and 1, supplying the bit sequence to an error correction algorithm to recognize and/or correct bit errors within the bit sequence, identifying uncertain image areas whose gray scale values each lie close to the binarizing threshold, and taking the uncertain image areas into special account in the error correction.

Abstract: The invention relates to a method of recognizing a code which is encoded inside an image data set which contains a piece of respective information on a gray scale value for each of a plurality of picture elements. At least one dilation operation and/or erosion operation is carried out on the image data set.

Abstract: A method for optically recognizing alphanumeric characters which involves storing polygonal outer contours and inner contours of reference characters and their relative geometrical positions as normalized reference curves transformed into a tangent space. Outer and inner contours of a character to be recognized are optically scanned and the scanned data is converted into binary data. The outer and inner contours of the character to be recognized are approximated as a polygon, and straight line segments of the polygon are normalized and transformed into a tangent space to generate character curves. The character to be recognized is compared to the reference characters in a rotation-invariant manner by shifting at least its character curve for the outer curve and the reference curves of the outer contours relative to each other in the tangent space until a surface area enclosed by the character curve and a given reference curve is at a minimum.

Abstract: A method for operating an optical sensor which has a light receptor that receives line-by-line reflected or returned light for a complete picture. At least some of the received pictures are compressed with a picture compression algorithm. To process the picture and more quickly store it in a memory-saving manner, the optoelectronic sensors compress the picture simultaneously with its receipt by the receptor. Optoelectronic sensors for use in this manner can be a code laser or a laser scanner for determining distance or generating separation pictures.

Abstract: The invention relates to a method of reading a machine-readable barcode including a pre-determined number of code elements, in particular bars and spaces, with a respective picture being taken by means of optical imaging of at least two adjacent and/or mutually overlapping part sections of the bar code, with the individual part sections each including a code element and the part sections including in sum all the code elements of the barcode, with the pictures being stored in a data store, and with the stored pictures or parts thereof being put together for the reconstruction of the information encoded by the barcode. The invention further relates to a corresponding apparatus.

Abstract: A device for optical scanning of markings, such as barcodes, has at least two transmitters (10, 20) that send light beams (12, 22) at different angles toward a rotating polygonal mirror (30), which deflects the light beams onto the markings being scanned. The light reflected by the markings is deflected by the polygonal mirrors (30) to separate receiver systems, so that the device has and simultaneously uses at least two separate transmitter/receiver channels.

Abstract: A method is described of detecting two-dimensional codes, in particular matrix codes, which include a plurality light and dark data bits arranged two dimensionally, in particular in matrix form. In the method, the code is detected as a gray scale value image; the detected gray scale value image is split into image areas corresponding to the individual data bits and a binarizing threshold representing a specific gray scale value is determined for the image areas. A respective binarizing of the gray scale value of the individual image areas is carried out by means of the binarizing threshold to produce a bit sequence which represents the data bits and consists of the values 0 and 1. The bit sequence is subsequently supplied to an error correction algorithm to recognize and/or correct bit errors within the bit sequence. In accordance with the invention, those so-called uncertain image areas are determined whose gray scale values each lie close to the binarizing threshold.

Abstract: A method is described of detecting two-dimensional codes, in particular matrix codes, which include a plurality of light and dark data bits arranged two-dimensionally, in particular in matrix form. In the method, the code is detected as a gray scale value image; the detected gray scale value image is split into image areas corresponding to the individual data bits and a binarizing threshold representing a specific gray scale value is determined for the image areas. A respective binarizing of the gray scale value of the individual image areas is carried out by means of the binarizing threshold to produce a bit sequence which represents the data bits and consists of the values 0 and 1. The bit sequence is subsequently supplied to an error correction algorithm to recognize and/or correct bit errors within the bit sequence. In accordance with the invention, those so-called uncertain image areas are determined whose gray scale values each lie close to the binarizing threshold.

Abstract: A method for operating optical sensors, particularly code readers, which have a light receptor that receives light reflected and/or returned from an object. A picture is generated from the received light and the content of the picture, such as a code, is read. At least some pictures are compressed with a picture compression algorithm of the sensor. To improve the operation of such optical sensors, especially code readers, and to improve the analysis of error detection from knowing the causes for errors, only pictures which have error information are compressed and stored. The code reader is constructed to perform these functions.

Abstract: The invention relates to a method of reading a machine-readable barcode including a pre-determined number of code elements, in particular bars and spaces, with a respective picture being taken by means of optical imaging of at least two adjacent and/or mutually overlapping part sections of the bar code, with the individual part sections each including a code element and the part sections including in sum all the code elements of the barcode, with the pictures being stored in a data store, and with the stored pictures or parts thereof being put together for the reconstruction of the information encoded by the barcode. The invention further relates to a corresponding apparatus.

Abstract: A method and an apparatus for the optically scanning of objects, especially markings, use at least two emitters (10; 20) arranged so that light beams (12; 22) emitted by them sample or scan the object at different angles. The at least two emitters (10, 20) are arranged so that the emitted light beams (12, 24) strike reflecting surfaces (32) of a polygonal mirror (30) at different angles to a plane (36) that is perpendicular to an axis of rotation of the polygonal mirror, and which direct the beams onto the object being scanned so that the beams strike the object at different angles. The polygonal mirror (30) directs the beams reflected by the object onto an associated, separate receiver system to form at least two separate emitter/receiver channels.

Abstract: A method for optically recognizing alphanumeric characters which involves storing polygonal outer contours and inner contours of reference characters and their relative geometrical positions as normalized reference curves transformed into a tangent space. Outer and inner contours of a character to be recognized are optically scanned and the scanned data is converted into binary data. The outer and inner contours of the character to be recognized are approximated as a polygon, and straight line segments of the polygon are normalized and transformed into a tangent space to generate character curves. The character to be recognized is compared to the reference characters in a rotation-invariant manner by shifting at least its character curve for the outer curve and the reference curves of the outer contours relative to each other in the tangent space until a surface area enclosed by the character curve and a given reference curve is at a minimum.

Abstract: The invention relates to a detection system and a detection method for the detection and tracking of optical codes on objects which are transported along a monitored zone, comprising a plurality of optoelectronic sensors to read the codes and to generate corresponding reading data and comprising at least two data buses, each having its own associated bus control unit, wherein each of the plurality of sensors is connected both to the one and to the other of the two data buses and wherein the one of the two data buses with the associated bus control unit, on the one hand, and the other data bus with the associated bus control unit, on the other hand, are divided into a primary branch and a secondary branch which is subordinate to the primary branch.