Method for face orientation determination in digital color images
First Claim
1. A digital image processing method for determining orientation of faces located in a digital color image, comprising the steps of:
- a) generating a mean grid pattern element image from a plurality of sample face images;
b) generating an integral image from the digital color image;
c) locating a face in the color digital image by using the integral image to perform a correlation test between the mean grid pattern element image and the digital color image at a plurality of effective resolutions by reducing the digital color image to a plurality of grid pattern element images at different effective resolutions and correlating the mean grid pattern element image with the plurality of grid pattern element images, whereby either the mean grid pattern element image or the grid pattern element images are provided at a plurality of different orientations; and
d) determining an orientation of the face in the color digital image by using the images with different orientations in the correlation test of step c).
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Abstract
A digital image processing method for determining an orientation of a face in a digital color image generates a mean grid pattern element image from a plurality of sample face images and an integral image from the digital color image. A face is located in the color digital image by using the integral image to perform a correlation test between the mean grid pattern element image and the digital color image at a plurality of effective resolutions by reducing the digital color image to a plurality of grid pattern element images at different effective resolutions and correlating the mean grid pattern element image with the plurality of grid pattern element images, whereby either the mean grid pattern element image or the grid pattern element images are provided at a plurality of different orientations. Accordingly, an orientation of the face in the color digital image is determined by using the images with different orientations in the correlation test.
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Citations
18 Claims
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1. A digital image processing method for determining orientation of faces located in a digital color image, comprising the steps of:
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a) generating a mean grid pattern element image from a plurality of sample face images;
b) generating an integral image from the digital color image;
c) locating a face in the color digital image by using the integral image to perform a correlation test between the mean grid pattern element image and the digital color image at a plurality of effective resolutions by reducing the digital color image to a plurality of grid pattern element images at different effective resolutions and correlating the mean grid pattern element image with the plurality of grid pattern element images, whereby either the mean grid pattern element image or the grid pattern element images are provided at a plurality of different orientations; and
d) determining an orientation of the face in the color digital image by using the images with different orientations in the correlation test of step c). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A digital image processing method for locating faces in a digital color image, comprising the steps of:
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a) generating a mean grid pattern element image from a plurality of sample face images by obtaining a mean face image from the plurality of sample face images, dividing the mean face image into a grid pattern comprising a plurality of cells, and forming the mean grid pattern element image from a mean value of each cell;
b) generating a grid pattern element image from a region of the digital color image that possibly contains a face; and
c) locating a face in the color digital image by performing a correlation test between the mean grid pattern element image and the grid pattern element image at a plurality of different image orientations, whereby either the mean grid pattern element image or the grid pattern element image is provided at the plurality of different orientations. - View Dependent Claims (13, 14, 15)
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16. A digital image processing method for locating a face in a digital color image, comprising the steps of:
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a) generating a mean grid pattern element image from a plurality of sample face images by obtaining a mean face image from the plurality of sample face images, dividing the mean face image into a grid pattern comprising a plurality of cells, and forming the mean grid pattern element image from a mean value of each cell;
b) generating an integral image from the digital color image; and
c) locating a face in the color digital image by using the integral image to perform a correlation test between the mean grid pattern element image and the digital color image at a plurality of effective resolutions by reducing the digital color image to a plurality of grid pattern element images at different effective resolutions and correlating the mean grid pattern element image with the plurality of grid pattern element images, whereby either the mean grid pattern element image or the grid pattern element images are provided at a plurality of different orientations. - View Dependent Claims (17, 18)
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Specification