Apparatus and a method for the detection of objects
AssigneeSick AG
InventorsMartin Wüstefeld, Georg Plasberg
Life of this patent
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Abstract
The invention relates to an apparatus and a method for the detection of an object moving in the monitored region of a camera, wherein measured values are compared with reference values and an object detection reaction is triggered when the measured value deviates in a predetermined manner from the reference value. In this respect, both the measured values and the reference values are derived from differences which exist between at least two different image regions.
Claims17
A method for the detection of an object moving in the monitored region of a camera, wherein
- an actual image of the monitored region is recorded by the camera;
- at least one actual measured value is derived from the actually recorded image which provides information on differences between at least two different image regions and which is invariant with respect to image displacements, image rotations and/or image size changes;
- this actual measured value is compared with a corresponding reference value derived from a stored reference image recorded by the camera;
- an object recognition reaction is triggered on a pre-set deviation of the actual measured value from the reference value;
- a structure, which is a component of the image, is superimposed on the reference image and the actually recorded image, the reference value and a measured value being gained from the corresponding structure information;
- and
- a check is made whether the camera is in working order by recording images regularly with and without a structure generated in the monitored region and by checking whether the structure information is found with a generated structure and is not found with no structure generated.
A method for the detection of an object moving in the monitored region of a camera, wherein
- an actual image of the monitored region is recorded by the camera;
- at least one actual measured value is derived from the actually recorded image which provides information on differences between at least two different image regions and which is invariant with respect to image displacements, image rotations and/or image size changes;
- this actual measured value is compared with a corresponding reference value derived from a stored reference image recorded by the camera;
- an object recognition reaction is triggered on a pre-set deviation of the actual measured value from the reference value;
- and
- one image is always recorded per shot with a generated structure and one with no structure generated, both in the recording of reference images and in the recording of actual images, and subsequently only the difference image from these two images is further processed.
Dependencies are inferred from the claim text.