摘要:
An automatic data collection device, such as a scanner-type device, is provided with a deformable mirror that operates in conjunction with a scanning mirror to scan a target machine-readable symbol using a scanning beam. The deformable mirror includes a reflective membrane having a shape that can be changed by applying electric charge to conductors, or by some other type of actuation. In this manner, the focus distance, depth of field, wavefront shape, or other property of the scanning beam can be changed dynamically. Feedback information can be provided to a focus control algorithm to control adjustment of the deformable mirror so as to optimize the scanning.
摘要:
A process for detection of straight-line segments in a stream of digital data that are representative of an image (m, n) in which the contour points of said image each defined by the modulus and the orientation θ of their gradient in relation to a horizontal axis are identified. The stream of digital data is stored in the form of two successive lines, each of n points P(i, j), for each of the lines the n points of said line are extracted successively, and for each point Pc(i, j) extracted, the so-called current point, the three points having inferior coordinates Pa(i−l, j−l), Pb(i, j−l), Pd(i−l, j) directly neighbouring said current point are extracted, successively the value of the orientation of the current point Pc is compared with that of the neighbouring points Pa, Pb and Pd. The values of the orientations of the points Pb and Pd are compared, the result of a comparison is validated if the points are contour points and if the values of their orientation are close. Moreover, when the result of a comparison is validated the coordinates of the point of the connection having inferior coordinates are copied over to those of the point having superior coordinates, it is verified whether solely the point Pa(i−l, j−l) is a contour point amongst the four points Pa, Pb, Pc, Pd extracted, and in the affirmative case the coordinates of the origin point and of the final point and the orientation of the straight-line segment, if its size is greater than a predetermined threshold, are saved.
摘要:
The invention relates to a device and a process for acquiring bichromatic bar codes, with a two-dimensional sensor with electronic scanning. The height Hy of the scanned portion is modified between at least two successive scanning operations. Thus, the device is or may be adapted to the type and/or to characteristics not known in advance of the code to be read.
摘要:
An optoelectronic device for acquisition of images, such as images of bar codes, includes a case which contains an electronic scanning sensor, an illumination source and optics including a diaphragm that permit the formation of images on the sensor. The optics include at least two diopters disposed between the diaphragm and the sensor. For example, the diopters may take the form of a revolved symmetrical lens, the useful part of which is convex, and a cylindrical lens which does not create any deflection in a plane parallel to the optical plane, and is convergent in a plane perpendicular to the parallel plane.
摘要:
The invention concerns an oplo-electronic device for acquisition of images of codes in one and two dimensions, comprising an electronic sensor constituted by a high-resolution photosensitive matrix, an analog/digital converter to convert the data emitted from the electronic sensor, and an image acquisition and processing module, comprising a preprocessing module and two processing modules, forming a pipe-line type architecture. The preprocessing module, acts in synchronous mode on the flow of digital data and implements simple image-processing operations. A number of cabled processing units can form the preprocessing modules. The processing modules, are constituted by programmable modules acting in asynchronous mode on the data emitted from the preceding module and stored in alternative manner in two memory blocks. The programmable modules are programmed to perform processing operations culminating in the obtaining of normalized data that are representative of the information “coded” in the captured code.
摘要:
A barcode label reader comprises a read window having a longer dimension parallel to an X axis and a lens system with an optical axis Y substantially normal to the window at its center which projects a conjugate image of a read line of the label onto a CCD type strip which is scanned sequentially to form a signal representing the barcode carried by the label. A strip of light-emitting diodes is disposed outside the X-Y plane to illuminate the label through the read window. A prismlike lens in the form of two refractors separated by a slot in the X-Y plane deflects the beam emitted by this strip so that it is substantially parallel to the X-Y plane. Thus, the depth of field of the reader is limited only by the aperture of the lens system.
摘要:
The invention relates to a device and a process for acquiring bichromatic bar codes, with a two-dimensional sensor with electronic scanning. The height Hy of the scanned portion is modified between at least two successive scanning operations. Thus, the device is or may be adapted to the type and/or to characteristics not known in advance of the code to be read.
摘要:
A process for detection of straight-line segments in a stream of digital data that are representative of an image (m, n) in which the contour points of said image each defined by the modulus and the orientation θ of their gradient in relation to a horizontal axis are identified. The stream of digital data is stored in the form of two successive lines, each of n points P(i, j), for each of the lines the n points of said line are extracted successively, and for each point Pc(i, j) extracted, the so-called current point, the three points having inferior coordinates Pa(i−l, j−l), Pb(i, j−l), Pd(i−l, j) directly neighbouring said current point are extracted, successively the value of the orientation of the current point Pc is compared with that of the neighbouring points Pa, Pb and Pd. The values of the orientations of the points Pb and Pd are compared, the result of a comparison is validated if the points are contour points and if the values of their orientation are close. Moreover, when the result of a comparison is validated the coordinates of the point of the connection having inferior coordinates are copied over to those of the point having superior coordinates, it is verified whether solely the point Pa(i−l, j−l) is a contour point amongst the four points Pa, Pb, Pc, Pd extracted, and in the affirmative case the coordinates of the origin point and of the final point and the orientation of the straight-line segment, if its size is greater than a predetermined threshold, are saved.
摘要:
The invention relates to a device and a process for acquiring bichromatic bar codes, with a two-dimensional sensor with electronic scanning. The height Hy of the scanned portion is modified between at least two successive scanning operations. Thus, the device is or may be adapted to the type and/or to characteristics not known in advance of the code to be read.
摘要:
An optoelectronic device for acquisition of images of objects, such as barcodes, includes a lighting system which is designed such that the axis of the light beam intersects the optical axis. A reflector that allows the image beam to pass through, and can reflect the light beam, is disposed such as to intercept the light beam, and is inclined relative to the optical axis, by an angle which is such that the light beam is centered on the optical axis. The lighting system is designed to light the useful optical field throughout the entire depth of the field, and the angle &agr;, in which the lighting system is seen from the object plane, is such that α ≤ Arc tg L 5 P , in which L is the width of the object plane, and P is the distance between the object and the lighting system.