Back to results
US 2003/0068073 A1Published application
Method for disturbance-component-free image acquisition by an electronic sensor
AssigneeInfineon Technologies AG
InventorBrigitte Wirtz
Life of this patent
Estimating the term…
Abstract
In a fingerprint sensor that effects capacitive measurement, a sequence of fingerprint images is recorded while a finger is placed on to the sensor. By comparing the best image with previous images of the sequence, the real constituent parts of the present image are determined and the remaining constituent parts are eliminated from the best image. Thus, residual prints and disturbance components brought about by contamination of the bearing area can be eliminated from the fingerprint image.
Claims7
A method for a disturbance-free image acquisition, which comprises the steps of:
- continuously increasing a coupling between a given image to be acquired and an electronic sensor;
- using the electronic sensor for recording a sequence of images during the coupling;
- choosing one of the images from the sequence of images as a starting image according to predetermined criteria;
- choosing from the sequence of images, at least one further image to be one of a correction image and used for determining the correction image;
- and
- correcting the starting image by subtraction of the correction image.
3 more elements
Dependencies are inferred from the claim text.