Image matching apparatus, image matching method, computer program and computer-readable storage medium
First Claim
Patent Images
1. An image matching apparatus comprising:
- a computer-readable memory constructed to store computer-executable process steps; and
a processor constructed to execute the computer-executable process steps stored in the memory;
wherein the process steps stored in the memory cause the processor to perform;
a detector step of detecting, from an input image containing an object to be matched, a region where the object exists;
an estimation step of estimating a parameter regarding a luminance value based on an image of the region;
a correction step of correcting the luminance value of the input image based on the parameter; and
a matching step of matching the corrected input image containing the object to be matched with an image containing a matching object,wherein, said correction step corrects the luminance value of the image by;
changing a luminance value smaller than a first threshold value to a minimum luminance value,changing a luminance value larger than a second threshold value to a maximum luminance value, andlinearly interpolating a luminance value located between the first threshold value and the second threshold value.
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Abstract
An image matching apparatus comprising, a detector adapted to detects, from an input image containing an object to be matched, a region where the object exists, an estimation unit adapted to estimates a parameter regarding a displaying characteristic based on an image of the region, a correction unit adapted to corrects the displaying characteristic of the input image based on the parameter, and a matching unit adapted to matches the corrected input image containing the object to be matched with an image containing a matching object.
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Citations
12 Claims
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1. An image matching apparatus comprising:
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a computer-readable memory constructed to store computer-executable process steps; and a processor constructed to execute the computer-executable process steps stored in the memory; wherein the process steps stored in the memory cause the processor to perform; a detector step of detecting, from an input image containing an object to be matched, a region where the object exists; an estimation step of estimating a parameter regarding a luminance value based on an image of the region; a correction step of correcting the luminance value of the input image based on the parameter; and a matching step of matching the corrected input image containing the object to be matched with an image containing a matching object, wherein, said correction step corrects the luminance value of the image by; changing a luminance value smaller than a first threshold value to a minimum luminance value, changing a luminance value larger than a second threshold value to a maximum luminance value, and linearly interpolating a luminance value located between the first threshold value and the second threshold value. - View Dependent Claims (2, 3)
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4. An image matching apparatus comprising:
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a computer-readable memory constructed to store computer-executable process steps; and a processor constructed to execute the computer-executable process steps stored in the memory; wherein the process steps stored in the memory cause the processor to perform; a detector step of detecting, from an input image containing an object to be matched, a region where the object exists; an estimation step of estimating a parameter regarding a displaying characteristic based on an image of the region; a correction step of correcting the displaying characteristic of the input image based on the parameter; and a matching step of matching the corrected input image containing the object to be matched with an image containing a matching object, wherein said matching step comprises; an extraction unit step of extracting a specific region from the corrected input image; a vector generation step of generating a feature vector based on the displaying characteristic of the specific region; and a vector matching step of executing matching by a support vector machine using the feature vector and matching information registered in a registration unit. - View Dependent Claims (5)
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6. An image matching method comprising:
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using a computer to perform a detecting step of detecting, from an input image containing an object to be matched, a region where the object exists; estimating a parameter regarding a luminance value based on an image of the region; correcting the luminance value of the input image based on the parameter; and matching the corrected input image containing the object to be matched with an image containing a matching object, wherein the luminance value of the image is corrected by; changing a luminance value smaller than a first threshold value to a minimum luminance value, changing a luminance value larger than a second threshold value to a maximum luminance value, and linearly interpolating a luminance value located between the first threshold value and the second threshold value. - View Dependent Claims (7, 8)
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9. An image matching method comprising:
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using a computer to perform a detecting step of detecting, from an input image containing an object to be matched, a region where the object exists; estimating a parameter regarding a displaying characteristic based on an image of the region; correcting the displaying characteristic of the input image based on the parameter; and matching the corrected input image containing the object to be matched with an image containing a matching object, wherein said matching the corrected input image with the image containing the matching object comprises; extracting a specific region from the corrected input image; generating a feature vector based on a luminance value of the specific region; and executing matching by a support vector machine using the feature vector and matching information. - View Dependent Claims (10)
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11. A non-transitory computer-readable storage medium retrievably storing a computer program for causing a computer to function as an image matching apparatus which comprises:
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a detector constructed to detect, from an input image containing an object to be matched, a region where the object exists; an estimation unit constructed to estimate a parameter regarding a luminance value based on an image of the region; a correction unit constructed to correct the luminance value of the input image based on the parameter; and a matching unit constructed to match the corrected input image containing the object to be matched with an image containing a matching object, wherein, said correction unit corrects the luminance value of the image by; changing a luminance value smaller than a first threshold value to a minimum luminance value, changing a luminance value larger than a second threshold value to a maximum luminance value, and linearly interpolating a luminance value located between the first threshold value and the second threshold value.
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12. A non-transitory computer-readable storage medium retrievably storing a computer program for causing a computer to function as an image matching apparatus which comprises:
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a detector constructed to detect, from an input image containing an object to be matched, a region where the object exists; an estimation unit constructed to estimate a parameter regarding a displaying characteristic based on an image of the region; a correction unit constructed to correct the displaying characteristic of the input image based on the parameter; and a matching unit constructed to match the corrected input image containing the object to be matched with an image containing a matching object, wherein said matching unit comprises; an extraction unit constructed to extract a specific region from the corrected input image; a vector generation unit constructed to generate a feature vector based on the displaying characteristic of the specific region; and a vector matching unit constructed to execute matching by a support vector machine using the feature vector and matching information registered in a registration unit.
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Specification