Portable Apparatuses Having Devices for Tracking Object's Head, and Methods of Tracking Object's Head in Portable Apparatus
First Claim
1. A portable apparatus comprising:
- a camera section configured to obtain an image of an object;
a head tracking section configured to detect an area, at which a first shape similarity and a color histogram similarity have maximum value, as a location of a head area, wherein the first shape similarity is a shape similarity between a candidate figure shown in the image of the object transmitted from the camera section and a modeling figure corresponding to a shape of a model head, and the color histogram similarity is a similarity between a first color histogram of an internal area of the candidate figure and a second color histogram of an internal area of the modeling figure; and
a camera controller configured to control a rotation of the camera section on the basis of the location of the detected head area.
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Accused Products
Abstract
The portable apparatus includes camera section, head tracking section, image processor, video codec section and camera controller. The camera section obtains image of object. The head tracking section receives the image from the camera section, detects head area from the image, simulates the head area using model of ellipse, and calculates shape similarity, which represents similarity between the shape of the gradients of pixels at boundary of the ellipse and that of the ellipse, and color histogram similarity between internal area of candidate figure and internal area of the modeling figure. In order to obtain of the position of candidate ellipse of which color histogram similarity has maximum value, mean shift, which requires small amount of calculation with respect to first number of samples in internal area of the candidate ellipse, is used. Image processing section performs image-processing on the image based on quality information of the detected head area. Video codec section performs differential encoding on the detected head area based on the location of the detected head area. The camera controller controls rotation of the camera section on the basis of the location of the detected head area. Robust head tracking algorithm with small quantity of calculation is modified to be adapted to portable device, the user'"'"'s head area may be tracked appropriately for the portable device.
16 Citations
23 Claims
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1. A portable apparatus comprising:
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a camera section configured to obtain an image of an object; a head tracking section configured to detect an area, at which a first shape similarity and a color histogram similarity have maximum value, as a location of a head area, wherein the first shape similarity is a shape similarity between a candidate figure shown in the image of the object transmitted from the camera section and a modeling figure corresponding to a shape of a model head, and the color histogram similarity is a similarity between a first color histogram of an internal area of the candidate figure and a second color histogram of an internal area of the modeling figure; and a camera controller configured to control a rotation of the camera section on the basis of the location of the detected head area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A portable apparatus comprising:
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a camera section configured to obtain an image of an object; a head tracking section configured to detect an area, at which a weight mean of a first shape similarity and a color histogram similarity have a maximum value, as a location of a head area, wherein the first shape similarity is a similarity between a candidate figure shown in the image transmitted from the camera section and a modeling figure corresponding to a shape of a model head, the color histogram similarity is a similarity between a first color histogram of an internal area of the candidate figure and a second color histogram of an internal area of the modeling figure, the first color histogram is obtained using a first number of samples in the internal area of the candidate figure, and the first number is a constant; and a camera controller configured to control a rotation of the camera section on the basis of the location of the detected head area. - View Dependent Claims (11, 12, 13)
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14. A method of tracking a head area of an object'"'"' in a portable apparatus
having a camera, the method comprising: -
obtaining a first candidate figure where a first color histogram similarity is more than or equal to a first reference value, the first color histogram similarity being a similarity between a model figure and N first samples in an internal area of candidate figures of a head image obtained by the camera, N being a natural number; calculating a first location of the head area at which a second color histogram similarity between the first candidate figure and the model figure has a maximum value; and detecting a second location of the head area and a size of the head area corresponding to the second location when a weight mean of a third color histogram similarity and a shape similarity has a maximum value, wherein the third color histogram similarity is a similarity between the model figure and M second samples in candidate figures generated by changing the size of the head area at the first location at which the second color histogram similarity has the maximum value, and the shape similarity is obtained based on to K third samples in a boundary of the candidate figures, M and K respectively is a natural number. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification