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Method and apparatus for sorting a flow of objects as a function of optical properties of the objects
| Details |
Inventors: Menten, Emmanuel J.;
Assignee: Elbicon N.V. (BE)
Primary Examiner: Shaver; Kevin P.
Assistant Examiner: Wacyra; Edward M.
Attorney, Agent or Firm: Ostrolenk, Faber, Gerb & Soffen
Method and apparatus for sorting objects dependent on optical characteristics thereof. The objects are conveyed through a longitudinal sorting zone. Light reflected from the objects passing the zone is detected by at least one imaging device having at least one single line array of equally spaced light sensitive imaging elements. The line array of imaging elements is repeatedly read out in series for providing a primary line signal comprising for each scan of the line array a primary group of primary intervals corresponding to respective imaging elements. Information representing light detected by each group of primary intervals is allocated to a secondary group of secondary intervals having the same duration of a secondary line signal for each scan such that the distribution of information allocated to a secondary group corresponds linearly to the distribution of the optical properties in the zone. Allocation is possible by scanning each imaging element for the same period of time and storing the information thus obtained in one or more locations of a memory according to a predetermined distribution table. Allocation is also possible by scanning the imaging elements with different periods of time dependent on a predetermined duration table providing the secondary line signal which can be supplied to a memory which receives a constant clock frequency during writing thereof. In each case the second line signal is provided when the respective memory is read out with a constant clock frequency. Secondary intervals of secondary line signals obtained from different imaging devices may then relate to identical parts of the zone for comparison purposes and for driving object rejectors corresponding to the parts dependent on the comparison results. |
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DETAILED DESCRIPTION The object of the invention is to eliminate the drawbacks of the known method.
According to the invention, this object is achieved for the method of the type mentioned hereinbefore by consecutively assigning, in accordance with a predetermined scheme, the image information, obtained during a scan, of each group of primary intervals to a corresponding secondary group of equal secondary intervals of a secondary line signal in a manner such that the distribution of the information assigned to a secondary group corresponds linearly to the distribution of the optical properties in the strip, each secondary interval corresponding to an associated sub-section of the strip, each having an equal length.
As a result of this, the information about the optical properties of each section of the strip is assigned to an equal number of secondary intervals so that it is possible to sort as a function of the length of regions of the strip having particular optical properties.
Furthermore, as a result of this the data of secondary line signals from different image pickup units can be combined with one another in order to energize the ejection devices as a function of the combined result.
According to the invention, the line signal used during the comparison step may be either the primary line signal or the secondary line signal.
In the known method, all the primary intervals have equal time durations.
According to the invention, the assignment scheme is therefore such that one or more secondary intervals are assigned to each primary interval or to a sub-group of primary intervals.
According to the invention, however, it is also possible to scan the row of image elements at a variable speed, the primary intervals having time durations which are determined by values derived from the system.
It is pointed out that the secondary intervals correspond to "positional elements" having equal lengths of the strip which are also called "plaxels" herein by analogy with the term "pixel" for an image pick-up element
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Image Analysis 
