Variable pixel binning in an optical biometric imaging device
AssigneeFingerprint Cards AB
InventorHans MARTINSSON
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Abstract
The present invention relates to a method of configuring an optical biometric imaging device comprising a photodetector pixel array, the method comprising: acquiring a biometric image of a biometric object using a first binning setting for binning of detection signals from subarrays of the photodetector pixels into a single pixel value;determining a measure indicative of the feature resolution of the biometric image; and determining, when the measure indicates that the feature resolution is below a feature resolution threshold, a second binning setting adapted to provide a higher feature resolution compared to the feature resolution of the biometric image.
Claims18
A method of configuring an optical biometric imaging device comprising a photodetector pixel array, the method comprising:
- acquiring a biometric image of a biometric object using a first binning setting for binning of detection signals from subarrays of the photodetector pixels into a single pixel value;
- determining a measure indicative of the feature resolution of the biometric image;
- determining, when the measure indicates that the feature resolution is below a feature resolution threshold, a second binning setting adapted to provide a higher feature resolution compared to the feature resolution of the biometric image;
- and
- acquiring a second biometric image of the biometric object using the second binning setting.
An optical biometric imaging device configured to be arranged under an at least partially transparent display panel and configured to capture an image of an object located on an opposite side of the transparent display panel, the biometric imaging device comprising:
- an image sensor comprising a photodetector pixel array;
- an array of light defining elements, wherein each light defining element is configured to define a subarray of pixels which receives light from the corresponding light defining element,
- a control unit connected to the image sensor and configured to:
- control the image sensor to acquire a first biometric image of a biometric object using a first binning setting for binning of detection signals from subarrays of the photodetector pixels into a single pixel value;
- determine a measure indicative of the feature resolution of the first biometric image,
- determine, when the measure indicates that the feature resolution is below a feature resolution threshold, a second binning setting adapted to provide a higher feature resolution compared to the feature resolution of the first biometric image;
- and
- control the image sensor to acquire a second biometric image of the biometric object using the second binning setting.
A computer program product comprising a non-transitory computer readable medium having stored thereon computer program means for controlling an optical biometric imaging device, the optical biometric imaging device comprising an image sensor and a control unit, wherein the computer program product comprises:
- code for determining a measure indicative of the feature resolution of a biometric image acquired with a first binning setting;
- and
- code for determining, when the measure indicates that the feature resolution is below a feature resolution threshold, a second binning setting adapted to provide a higher feature resolution compared to the feature resolution of the biometric image;
- and
- code for controlling the image sensor to acquire a second biometric image of the biometric object using the second binning setting.
A method of configuring an optical biometric imaging device comprising a photodetector pixel array, the method comprising:
- acquiring a biometric image of a biometric object using a first binning setting for binning of detection signals from subarrays of the photodetector pixels into a single pixel value;
- determining a measure indicative of the feature resolution of the biometric image;
- and
- determining, when the measure indicates that the feature resolution exceeds a second feature resolution threshold, a third binning setting adapted to provide a lower feature resolution compared to the feature resolution of the biometric image;
- acquiring a biometric image of the biometric object using the third binning setting.
Dependencies are inferred from the claim text.