摘要:
A Multisensor array optically inspects and sorts bulk materials into different fractions, in which the bulk material stream is detected from a short distance compared to the width of the bulk material stream with at least two identical camera and lighting modules arranged adjacent to each other. The width of the image of the cameras is smaller than the width of the bulk material stream. The image sensors and lighting devices are limited to the range of the wavelengths of 380 nm to 1,000 nm covered by CMOS and/or CCD image sensors. Each camera is connected by a mechanical bracket and is equipped with at least one and preferably with a set of linearly lighting semiconductor light sources, which emit in a narrow band and are pulsed synchronously with the line frequency of the camera. The linearly lighting light sources can be replaced by a changing mechanism of the bracket, which mechanism is connected to the camera, to other light sources, especially ones having different system parameters. The actuating signals of the lighting sources pulsed synchronously with the line cycle of the image sensors can be generated by an electronic device according to a variable synchronization diagram, which can be optimized for the discrimination of the fractions of the bulk material stream. The signals of the camera or cameras are analyzed by at least one image computer by pattern recognition and classification for recognizing, assigning and rating the particles of the at least two fractions. Timely ejection signals are generated by a control device by real-time image processing operators in order to remove particles of at least one fraction to be removed from the bulk material stream with ejectors.
摘要:
There is described a method and an apparatus for the optical 3D digitization of bodies and body parts which reveal non-visible regions which therefore cannot be detected by the 3D digitizer. A mechanical aid is fixed at these regions and protrudes into the measurement space visible for the 3D digitizer. On this visible part, it is provided with marks and is digitized together with the remaining, visible body parts. From the spatial position of the marks of these aids, important geometrical information of the non-visible parts, such as the spatial position, circumferential dimensions, etc., can be calculated, and the 3D model of the body or body part incomplete at these points can be completed therewith. Two applications from the field of orthopedics are described by way of example.
摘要:
A method of detecting the 3D shape of an object by photogrammetry, in which a plurality of photogrammetric point markers and a plurality of connecting markers are provided on the surface of the object, each connecting marker connecting a subset of the plurality of point markers with each other, with at least two different types of point markers existing that differ from each other in their optical configuration, and some of the point markers provided along a connecting marker are formed in such a way that the sequence of their optical configurations results in a predetermined code that characterizes the respective connecting marker, a plurality of photogrammetric images of the object are taken from different views, an image processing of the images is performed, in which first the connecting markers mutually corresponding to each other in the images are associated with one another using their respective code, and then the point markers connected with each other by the respective connecting marker are associated with one another with the aid of the connecting marker association in the images, and using the point marker association, the 3D shape of the object is determined by means of a photogrammetric evaluation process. The invention further relates to an arrangement for carrying out the method.
摘要:
A method for the optical inspection of a transparent protective layer and a colored patterned surface which is at least partially covered by the transparent protective layer involves providing a source of illumination and an imaging sensor associated with the source of illumination and illuminating the protective layer with light emitted by the source of illumination in order to recognize defective places inside and beneath the transparent protective layer. The source of illumination emits light in the shortwaved range which is at least partially diffuse and the light striking the surface penetrates at least partially into the protective layer and is scattered at the defective places. Light scattered from the defective places is picked up by the imaging sensor and the defective places are recognized by the local increase in the intensity of the light picked up by the imaging sensor in the area of the defective places.
摘要:
A method for the optical three dimensional measurement of a tooth without calibration bodies. An optical projection system projects a pattern onto a tooth, and an optical imaging system images the pattern projected thereon, from a first position in space and subsequently from a second position in space, with the images from the two positions in space having a common imaged area of the tooth. The image patterns are evaluated to calculate three dimensional coordinate data of the tooth surface relative to the respective imaging position for each image and also for the two images combined, to produce a single three dimensional tooth surface data record. In this method, points and/or surfaces are selected from the common imaged area with the aid of properties of the tooth surface contour which are invariant under displacement and rotation, so that they can be clearly correlated with each other. The change in position between the first and second positions in space is determined with the aid of the selected points and/or surfaces and their relative coordinate data.
摘要:
The invention relates to an automatic system for repairing surfaces having natural patterns, particularly wood panels, wherein after the automatic detection and repair of the faulty regions by smoothing or doweling, the Visually apparent repair regions are decorated loudly by a numerically controlled decoration process, particularly an ink jet printing technology. To this end, the panel is captured optically by a scanner, which in particular can detect colors, in addition to an image generator suitable for detecting the faulty regions. From the global color and structure characteristics of the panel and the local color and structure characteristic of each individual faulty region, local decoration patterns to be applied automatically are derived, which allow the faulty region to not be apparent any longer and give the panel a desired aesthetic appearance both locally and globally.
摘要:
For an automatic detection of the 3D shape of objects by photogrammetry, the background of the photogrammetric point markers is characterized by area markers which comprise a plurality of point markers and have a characteristic optical configuration that is expressed, e.g., in the color, shape, texture, or gray level of the surface area of the area marker. During the image processing of the photogrammetric images taken of an object, first the area markers and then the point markers present in the respective area markers are referenced in relation to one another. Instead of using area markers, a further embodiment uses constellation-type point marker arrangements, which are first referenced before the individual point markers forming the constellations are referenced. The method is particularly useful for the 3D detection of body parts which have been clad with an envelope marked in accordance with the invention, prior to the photogrammetric evaluation.
摘要:
To sort materials, in particular plastic parts, the items are carried at known conveying speed past a material recognition system which uses non-contact scanning, for example NIR spectroscopy, of each item to determine its material type and delivers a signal that identifies the type of material, which signal is used in sorting the items according to material type. To ensure that the determination of material type is done at a spot on the item that is not disturbed by a label, metal stamp or the like, the items are also conveyed past an imaging system which takes pictures of the items from which, using electronic image-processing techniques, features of colour and/or shape of the items are determined, from which in turn position data are derived about spots on the item at which an undisturbed determination of material type is possible. With the aid of these position data the determination of material type is then confined to such undisturbed spots.
摘要:
An apparatus for sorting particles of a bulk material moving on a transport ribbon (38) comprises an electro optical monitoring unit (101) above transport ribbon (38) for detecting the particles to be sorted out. Jet nozzles (45, 46) are controlled by a signal emitted by this electro optical monitoring unit (40), the jet nozzles being provided at the side opposite the bulk material of transport ribbon (38), which consists of an air permeable material. By means of the gas jet passing through transport ribbon (38), the particles to be sorted out are lifted off from the transport ribbon and are thrown into storage containers (47, 48).The bulk material is passed through a gap between rollers or grinding elements to provide flake-shaped particles which are then observed to provide first and second measurements which are subtracted from each other. A vibrating conveyor 87 with feeding channels 87.1 separate particles for disposition upon a ribbon 538 with the aid of a jet nozzle n.
摘要:
The sensor (20) is intended for the detection of random signals, suitable for correlative signal processing, originating from a process in motion relative to the sensor, for example a flow passing through a pipeline (1). Signals of this nature are used, in particular, for the measurement of velocity or running time. The sensor (20) is subdivided into several sensor segments (21, 22, 23, 24) in order to increase sensitivity for a given spatial frequency filter effect. In the case of a capacitive sensor, each sensor segment consists of two electrodes encompassing the pipeline (1). The sensor segments (21, 22, 23, 24) are arranged along the direction of motion according to a coding selected on the basis of the desired spatial frequency filter effect, with the introduction of gaps (25, 25, 27) which are insensitive to the characterizing parameter of the process in motion. The spatial frequency filter effect and, in particular, its limit frequency, will then correspond to that of an individual sensor segment, while the total aperture, which determines the sensitivity, is equal to the sum of the aperture segments of the sensor segments present.