Method and device for identifying objects in digital images
AssigneeAnoto AB
InventorAndreas Olsson
Life of this patent
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Abstract
In a method for identifying objects in a digital image which is included in a sequence of images, luminance values of a current digital image are compared with at least one threshold value in order to create a current binarized image on the basis of the comparison. A quality measure for the current binarized image is also calculated, whereupon said at least one threshold value is updated on the basis of the quality measure for use in binarization of a subsequent image. The method can be realized in the form of a computer program, a computer program product, a device, and a hand-held apparatus for position determination.
Claims25
A method for identifying objects in a digital image included in a sequence of images, comprising:
- comparing luminance values of a current digital image with at least one threshold value in order to create, on the basis of the comparison, a current binarized image;
- calculating a quality measure for the current binarized image;
- and
- updating, on the basis of said quality measure, said at least one threshold value for use in binarization of a subsequent image.
A computer program with program code which, when executed in a unit provided with a processor, causes the latter to effect binarization of a sequence of digital images and effect a feedback control of at least one thresholding parameter used in the binarization in order to obtain a set value in the form of a quality measure of the images after the binarization.
A device for identifying objects in a digital image included in a sequence of images, comprising:
- segmentation means which is adapted to retrieve at least one threshold value and compare luminance values of a current digital image with said at least one threshold value in order to create a current binarized image on the basis of the comparison;
- and
- control means which is adapted to calculate a quality measure for the current binarized image and, on the basis of the quality measure, to update said at least one threshold value;
- wherein said segmentation means is adapted to retrieve the updated threshold value for use in binarization of a subsequent image.
Dependencies are inferred from the claim text.