Device and method for detecting targets in images based on user-defined classifiers
First Claim
1. A target detection device for detecting predetermined targets that are captured within an image, the device including:
- a target region identification device that is configured to identify a region of interest in the captured image, the region of interest including a target having geometries consistent with the predetermined targets; and
a classification device that is configured to determine whether the region of interest includes the predetermined targets by analyzing the region of interest with a strong classifier descriptor that describes at least one of shape attributes and appearance attributes that are characteristic of the predetermined targets,wherein the strong classifier descriptor is based on a linear weighted combination of a subset of weak classifier descriptors, and the subset of weak classifier descriptors is selected from a plurality of weak classifier descriptors that each describe at least one of shape attributes and appearance attributes that are characteristic of parts of the predetermined targets, and wherein the subset of weak classifier descriptors includes at least one user-defined weak classifier descriptor that is defined by a user based on database images including the predetermined targets.
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Accused Products
Abstract
A device and method for detecting targets of interest in an image, such as people or objects of a certain type. Targets are detected based on an optimized strong classifier descriptor that can be based on a combination of weak classifier descriptors. The weak classifier descriptors can include a user-defined weak classifier descriptor that is defined by a user to represent a shape or appearance attribute that is characteristic of parts of the target of interest. The strong classifier descriptor can be optimized by selecting a subset of weak classifier descriptors that exhibit improved performance in detecting targets in training images.
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Citations
17 Claims
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1. A target detection device for detecting predetermined targets that are captured within an image, the device including:
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a target region identification device that is configured to identify a region of interest in the captured image, the region of interest including a target having geometries consistent with the predetermined targets; and a classification device that is configured to determine whether the region of interest includes the predetermined targets by analyzing the region of interest with a strong classifier descriptor that describes at least one of shape attributes and appearance attributes that are characteristic of the predetermined targets, wherein the strong classifier descriptor is based on a linear weighted combination of a subset of weak classifier descriptors, and the subset of weak classifier descriptors is selected from a plurality of weak classifier descriptors that each describe at least one of shape attributes and appearance attributes that are characteristic of parts of the predetermined targets, and wherein the subset of weak classifier descriptors includes at least one user-defined weak classifier descriptor that is defined by a user based on database images including the predetermined targets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13)
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8. A target detection device for detecting predetermined targets that are captured within an image, the device including:
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a target region identification device that is configured to identify a region of interest in the captured image, the region of interest including a target having geometries consistent with the predetermined targets; and a classification device that is configured to determine whether the region of interest includes the predetermined targets by analyzing the region of interest with a strong classifier descriptor that describes at least one of shape attributes and appearance attributes that are characteristic of the predetermined targets, wherein the strong classifier descriptor is based on a subset of weak classifier descriptors that is selected from a plurality of weak classifier descriptors that each describe at least one of shape attributes and appearance attributes that are characteristic of parts of the predetermined targets, and wherein the subset of weak classifier descriptors includes at least one user-defined weak classifier descriptor that is defined by a user based on database images including the predetermined targets, and wherein the strong classifier descriptor is adapted to an environmental condition by iteratively selecting the subset of weak classifier descriptors that exhibits improved performance in detecting the predetermined targets from training images taken with the environmental condition.
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14. A method of detecting predetermined targets that are captured within an image, the method including:
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identifying a target region of interest in the captured image, the target region of interest including a target with geometries consistent with the predetermined targets; and determining whether the region of interest includes the predetermined targets by analyzing the region of interest with a strong classifier descriptor that describes at least one of shape attributes and appearance attributes that are characteristic of the predetermined targets; wherein the strong classifier descriptor is based on a linear weighted combination of a subset of weak classifier descriptors, and the subset of weak classifier descriptors is selected from a plurality of weak classifier descriptors that each describe at least one of shape attributes and appearance attributes that are characteristic of parts of the predetermined targets, and wherein the subset of weak classifier descriptors includes at least one user-defined weak classifier descriptor that is defined by a user based on database images including the predetermined targets. - View Dependent Claims (15, 16, 17)
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Specification