Apparatus for extracting feature points from a facial image
First Claim
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1. An apparatus for outputting data indicative of matching features of a face with data in a data-base, said apparatus comprising:
- an image picture inputter for receiving an input image of a face, said image including a plurality of facial feature searching regions each of which corresponds to a respective facial feature of said face;
an edge extractor for processing said input image of said face to form an edged-image of said face;
a binary level converter for dividing said image into said plurality of facial feature searching regions and subsequently performing a binary level conversion on said edged-image of said face corresponding to a plurality of facial feature points of said face, said binary level converter converting said edged-image of said face into a binary-leveled edged-image of said face;
a shape data-base permanently storing a plurality of shape data as a reference data-base for said plurality of facial feature points, said shape data comprising coordinate data and gradient vectors in x,y coordinates;
an image picture arithmetic processor for determining an amount of correspondence by computing a correlation value between data of each of said plurality of facial feature points of said binary-leveled edged-image of said face and each corresponding one of said plurality of facial feature points of said shape data stored in said shape data-base;
a shape data-base changer for changing copied data of said plurality of shape data copied from said shape data-base; and
an outputter for outputting data indicative of said matching features of said face based on said correlation value and said copied data, whereinusing both said edge extractor and said binary level converter results in decreased sensitivity of said apparatus to changes in lighting.
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Abstract
A facial image picture data is processed by an edge extraction part, which performs edge extraction on the inputted image picture. The processed data is then converted by a binary level conversion part for each preestimated point of facial elements. An image picture arithmetic processing part performs time-to-time arithmetic computation of correlation values between the data of the binary-leveled edged-image picture and the data having been previously stored in the shape data-base part, and issues an output including extracted data of feature points of the facial image picture.
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Citations
13 Claims
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1. An apparatus for outputting data indicative of matching features of a face with data in a data-base, said apparatus comprising:
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an image picture inputter for receiving an input image of a face, said image including a plurality of facial feature searching regions each of which corresponds to a respective facial feature of said face; an edge extractor for processing said input image of said face to form an edged-image of said face; a binary level converter for dividing said image into said plurality of facial feature searching regions and subsequently performing a binary level conversion on said edged-image of said face corresponding to a plurality of facial feature points of said face, said binary level converter converting said edged-image of said face into a binary-leveled edged-image of said face; a shape data-base permanently storing a plurality of shape data as a reference data-base for said plurality of facial feature points, said shape data comprising coordinate data and gradient vectors in x,y coordinates; an image picture arithmetic processor for determining an amount of correspondence by computing a correlation value between data of each of said plurality of facial feature points of said binary-leveled edged-image of said face and each corresponding one of said plurality of facial feature points of said shape data stored in said shape data-base; a shape data-base changer for changing copied data of said plurality of shape data copied from said shape data-base; and an outputter for outputting data indicative of said matching features of said face based on said correlation value and said copied data, wherein using both said edge extractor and said binary level converter results in decreased sensitivity of said apparatus to changes in lighting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification