Jenoptik Optical Systems Gmbh

Jenoptik Aktiengesellschaft

Jenoptik Laser, Optik, Systeme Gmbh

Burkhard Hahn

Siegfried Belke

Steffen Loesch

A method for noise suppression in images of an image sequence, where an iteratively better adapted noise suppression can be ensured for images of the image sequence, in particular in a rising number of images in the image sequence. The method for noise suppression includes a low-pass filter algorithm:=&#x3b1;*+(&#x3b1;)*Qwith an attenuation function &#x3b1;=&#x3b1;(&#x3b1;,&#x393;).

Method for noise reduction in images in an image sequence

In a method for reducing color moir&#xe9; in digital images, the object is to improve the suppression of color moir&#xe9; in such a way that effects on edge areas and fine structures are further reduced in that low-frequency beats causing color moir&#xe9; are detected and attenuated in such a way that correction is carried out only for two-dimensionally extensive areas and the edge areas and fine structures remain excluded to a great extent. A comparison of bandpass energies between the luminance channel and chrominance channels serves as a marking criterion in order initially to determine pixels in which color moir&#xe9; is present and then to carry out a frequency-selective energy reduction in the chrominance channels at middle frequencies for suppressing the long-wave color moir&#xe9;.

Method for reducing color moir&#xe9; in digital images

An arrangement for the detection of disk-shaped objects in a cassette preferably for detecting the presence and the position of semiconductor wafers in a cassette is disclosed. Reliable detection of disk-shaped objects in cassettes is provided regardless of their orientation or any discontinuity in their edge region. This is done by an arrangement by detecting light reflected at the edges of the objects in that it has at least two linearly elongated rows of light sources which are arranged parallel to a family of planes predetermined by the cassette shelves and objects and which lie in a surface parallel to the edge areas to be detected. Further, an objective is arranged between the parallel linear light sources and by which a plurality of shelves is imaged simultaneously on the sensor unit. There can be read out of the array of sensor elements at least portions of an edge area of the objects which is elongated transversely to such an extent that, when imaged in the sensor plane, an irregularity present in the edge area of the object is always less than the read out portions of the elongated edge area.

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Jena, Germany

Burkhard Hahn