METHOD FOR DETECTING PARTICULAR OBJECT FROM IMAGE AND APPARATUS THEREOF
First Claim
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1. An image processing apparatus comprising:
- a first derivation unit configured to derive feature quantities in a plurality of local regions in an image;
an attribute discrimination unit configured to discriminate respective attributes of the derived feature quantities according to characteristics of the feature quantities;
a region setting unit configured to set a region-of-interest in the image;
a second derivation unit configured to discriminate attributes of the feature quantities contained in the region-of-interest based on the attributes discriminated by the attribute discrimination unit, and to derive likelihoods with respect to a predetermined plurality of types of objects in the region-of-interest according to discriminated attributes;
a dictionary selection unit configured to select a dictionary, from among a plurality of dictionaries set in advance, which represents a feature quantity specific to the object, according to the derived likelihoods; and
an object discrimination unit configured to discriminate objects in the region-of-interest, based on the feature quantity specific to the object extracted from the selected dictionary, and the feature quantities in the region-of-interest.
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Abstract
When discriminating a plurality of types of objects, a plurality of local feature quantities are extracted from local regions in an image, and positions of the local regions, and attributes according to image characteristics of the local feature quantities are stored in correspondence with each other. Then, object likelihoods with respect to a plurality of objects are determined from attributes of feature quantities in a region-of-interest, an object whose object likelihood is not less than a threshold value is determined as an object candidate, and whether an object candidate is a predetermined object is determined.
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Citations
8 Claims
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1. An image processing apparatus comprising:
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a first derivation unit configured to derive feature quantities in a plurality of local regions in an image; an attribute discrimination unit configured to discriminate respective attributes of the derived feature quantities according to characteristics of the feature quantities; a region setting unit configured to set a region-of-interest in the image; a second derivation unit configured to discriminate attributes of the feature quantities contained in the region-of-interest based on the attributes discriminated by the attribute discrimination unit, and to derive likelihoods with respect to a predetermined plurality of types of objects in the region-of-interest according to discriminated attributes; a dictionary selection unit configured to select a dictionary, from among a plurality of dictionaries set in advance, which represents a feature quantity specific to the object, according to the derived likelihoods; and an object discrimination unit configured to discriminate objects in the region-of-interest, based on the feature quantity specific to the object extracted from the selected dictionary, and the feature quantities in the region-of-interest. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image processing method comprising:
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deriving, from a plurality of local regions in an image, feature quantities in the local regions; discriminating respective attributes of the derived feature quantities, according to characteristics of the feature quantities; setting a region-of-interest in the image; discriminating attributes of feature quantities contained in the set region-of-interest, according to attributes of feature quantities in the local regions, deriving likelihoods with respect to a predetermined plurality of types of objects in the region-of-interest from discriminated attributes; selecting a dictionary that represents a feature quantity specific to the object, according to the derived likelihoods, from among a plurality of dictionaries set in advance with respect to objects; and discriminating an object in the region-of-interest, based on the feature quantity specific to the object extracted from the selected dictionary that was set, and feature quantities in the region-of-interest.
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8. A computer-readable storage medium that stores a program for instructing a computer to implement an image processing method, the method comprising:
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deriving, from a plurality of local regions in an image, feature quantities in the local regions; discriminating respective attributes of the derived feature quantities, according to characteristics of the feature quantities; setting a region-of-interest in the image; discriminating attributes of feature quantities contained in the set region-of-interest, according to attributes of feature quantities in the local regions, deriving likelihoods with respect to a predetermined plurality of types of objects in the region-of-interest from discriminated attributes; selecting a dictionary that represents a feature quantity specific to the object, according to the derived likelihoods, from among a plurality of dictionaries set in advance with respect to objects; and discriminating an object in the region-of-interest, based on the feature quantity specific to object extracted from the selected dictionary that was set, and feature quantities in the region-of-interest.
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Specification