Sequential image alignment
First Claim
Patent Images
1. A method comprising:
- acquiring images of a fingerprint from a finger upon relative movement between the finger and an image sensor;
selecting lines from said acquired images representing a new area of said fingerprint;
determining composition parameters for each selected line;
storing said composition parameters and said selected lines such that a composite image comprising said selected lines is composable, wherein said composition parameters comprises an offset value for each selected line;
forming a sub-image comprising a set of said selected lines when said selected lines reach a predetermined amount;
comparing said sub-image with a reference image; and
deleting said lines of said set after said comparison is performed.
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Abstract
A method for reading fingerprints is disclosed. The method comprises acquiring images of a fingerprint from a finger upon relative movement between the finger and an image sensor; selecting lines from said acquired images representing a new area of said fingerprint; determining composition parameters for each selected line: and storing said composition parameters and said selected lines such that a composite image comprising said selected lines is composabte. A corresponding fingerprint reading apparatus, a device, and a computer program are also disclosed.
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Citations
26 Claims
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1. A method comprising:
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acquiring images of a fingerprint from a finger upon relative movement between the finger and an image sensor; selecting lines from said acquired images representing a new area of said fingerprint; determining composition parameters for each selected line; storing said composition parameters and said selected lines such that a composite image comprising said selected lines is composable, wherein said composition parameters comprises an offset value for each selected line; forming a sub-image comprising a set of said selected lines when said selected lines reach a predetermined amount; comparing said sub-image with a reference image; and deleting said lines of said set after said comparison is performed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A fingerprint reading apparatus comprising:
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a sensor arranged to acquire images of a fingerprint from a finger upon relative movement between the finger and said image sensor; a processor arranged to select, from said acquired images, lines representing a new area of said fingerprint such that a composite image is composable, and the processor is further arranged to determine composition parameters for each selected line; a memory arranged to store said composition parameters and said selected lines, wherein said composition parameters comprises an offset value for each selected line; a sub-image generator arranged to form a sub-image comprising a set of said selected lines when said selected lines reach a predetermined amount; and a comparator arranged to compare said sub-image with a reference image, wherein said lines of said set are deletable after said comparison is performed. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification