Image sensor with integrated region of interest calculation for iris capture, autofocus, and gain control
First Claim
1. An integrated circuit, comprising:
- an image sensor configured to receive at least one image comprising a plurality of pixels from a camera comprising a lens;
a buffer communicatively connected to the image sensor for storing values associated with the plurality of pixels; and
a comparator circuit portion of the integrated circuit communicately connected to the buffer configured to locate and identify the iris of a subject from the stored values;
wherein locating and identifying the iris of the subject is based on a location of each pixel in a brightest pixel set determined by the comparator circuit portion and a pattern formed by the brightest pixel set.
1 Assignment
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Accused Products
Abstract
An integrated circuit has an image sensor to receive at least one image comprising a plurality of pixels from a camera comprising a lens, a buffer communicatively connected to the image sensor for storing values associated with the plurality of pixels, and a comparator communicately connected to the buffer to locate and identify the iris of a subject, in which locating and identifying the iris of the subject is based on a location of each pixel in a brightest pixel set. A method for locating and identifying an iris in an image includes capturing at least one image of an illuminated subject, determining a brightness value for each of the plurality of pixels, determining a location corresponding to each pixel in a brightest pixel set, and identifying the iris in the at least one image based on the location of each pixel in the brightest pixel set.
34 Citations
15 Claims
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1. An integrated circuit, comprising:
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an image sensor configured to receive at least one image comprising a plurality of pixels from a camera comprising a lens; a buffer communicatively connected to the image sensor for storing values associated with the plurality of pixels; and a comparator circuit portion of the integrated circuit communicately connected to the buffer configured to locate and identify the iris of a subject from the stored values; wherein locating and identifying the iris of the subject is based on a location of each pixel in a brightest pixel set determined by the comparator circuit portion and a pattern formed by the brightest pixel set. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit, comprising:
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an image sensor in the integrated circuit configured to capture an image of an illuminated subject; scan logic circuitry in the integrated circuit connected to the image sensor, the scan logic circuitry configured to take pixel values of each pixel identified by an address in the image sensor and to send the addresses and the pixel values to a buffer; a comparator circuit in the integrated circuit to retrieve the addresses and the pixel values from the buffer and to determine a set of brightest pixels and a pattern formed by the set of brightest pixels as a region of interest; and autofocus logic circuitry to autofocus a camera based upon the region of interest. - View Dependent Claims (9, 10, 11)
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12. A method for locating and identifying an iris in an image, the method comprising:
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capturing at least one image of an illuminated subject with an image sensor, wherein the image comprises a plurality of pixels; determining a brightness value for each of the plurality of pixels; identifying specularities in the iris from the brightness values for each of the plurality of pixels, the specularities defining a brightest pixel set; determining a location corresponding to each pixel in the brightest pixel set; and identifying the iris in the at least one image based on the location of each pixel in the brightest pixel set and a pattern formed by the brightest pixel set. - View Dependent Claims (13, 14, 15)
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Specification