Multimodal image registration using compound mutual information
First Claim
1. A method for registering first and second digital images captured using first and second different capture modalities, said method comprising the steps of:
- transforming said second digital image in the second modality to be more like said first digital image in the first modality using a modification function, to provide a modified second digital image;
determining a set of first features of each of said first and modified second digital images;
specifying mutually exclusive zones in each of said first and modified second digital images where each of the specified mutually exclusive zones is less than an entirety of each of said first and modified second digital images;
determining a set of zonal features of each of said specified mutually exclusive zones of each of said first and modified second digital images;
computing compound mutual information from said first features and said zonal features where compound mutual information comprises an aggregate measure of mutual information;
altering said modification function; and
iterating said transforming, determining, specifying, determining, computing, and altering steps until said compound mutual information is maximized,wherein said computing further comprises;
(1) extracting a set of global marginal densities from a set of global features and a set of zonal marginal densities from said set of zonal features, and(2) applying weighting coefficients to said sets of marginal densities to provided weighted marginal mutual information, and aggregating said weighted marginal mutual information in accordance with the formula;
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Abstract
In a digital image registration method, a second digital image is transformed to be more like a first digital image using a modification function, resulting in a modified second digital image. A set of first features of each of the first and modified second digital images is determined. Zones are specified in each of the first and modified second digital images. A set of zonal features, of each of the zones is determined. Compound mutual information is computed from the first and zonal features. The modification function is altered. The transforming, determining, specifying, determining, computing, and altering are iterated until the compound mutual information is maximized.
56 Citations
30 Claims
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1. A method for registering first and second digital images captured using first and second different capture modalities, said method comprising the steps of:
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transforming said second digital image in the second modality to be more like said first digital image in the first modality using a modification function, to provide a modified second digital image; determining a set of first features of each of said first and modified second digital images; specifying mutually exclusive zones in each of said first and modified second digital images where each of the specified mutually exclusive zones is less than an entirety of each of said first and modified second digital images; determining a set of zonal features of each of said specified mutually exclusive zones of each of said first and modified second digital images; computing compound mutual information from said first features and said zonal features where compound mutual information comprises an aggregate measure of mutual information; altering said modification function; and iterating said transforming, determining, specifying, determining, computing, and altering steps until said compound mutual information is maximized, wherein said computing further comprises; (1) extracting a set of global marginal densities from a set of global features and a set of zonal marginal densities from said set of zonal features, and (2) applying weighting coefficients to said sets of marginal densities to provided weighted marginal mutual information, and aggregating said weighted marginal mutual information in accordance with the formula; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 30)
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27. A system for registering first and second digital images captured using first and second different capture modalities, said method comprising the steps of:
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means for transforming said second digital image in the second modality to be more like said first digital image in the first modality using a modification function, to provide a modified second digital image; means for determining a set of first features of each of said first and modified second digital images; means for specifying mutually exclusive zones in each of said first and modified second digital images where each of the specified mutually exclusive zones is less than an entirety of each of said first and modified second digital images; means for determining a set of zonal features of each of said specified mutually exclusive zones of each of said first and modified second digital images, said zonal features being different than said first features; means for computing compound mutual information from said first features and said zonal features where compound mutual information comprises an aggregate measure of mutual information; means for altering said modification function; and means for iterating said transforming, determining, specifying, determining, computing, and altering steps until said compound mutual information is maximized, wherein said means for computing further comprises; (1) means for extracting a set of global marginal densities from a set of global features and a set of zonal marginal densities from said set of zonal features, and (2) means for applying weighting coefficients to said sets of marginal densities to provided weighted marginal mutual information, and aggregating said weighted marginal mutual information in accordance with the formula; - View Dependent Claims (28)
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29. A computer program product for registering first and second digital images captured using first and second different capture modalities, the computer program product comprising computer readable storage medium having a computer program stored thereon for performing the steps of:
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transforming said second digital image in the second modality to be more like said first digital image in the first modality using a modification function, to provide a modified second digital image; determining a set of first features of each of said first and modified second digital images; specifying mutually exclusive zones in each of said first and modified second digital images where each specified mutually exclusive zone is less than an entirety of each of said first and modified second digital images; determining a set of zonal features of each of said specified mutually exclusive zones of each of said first and modified second digital images; computing compound mutual information from said first features and said zonal features where compound mutual information comprises an aggregate measure of mutual information; altering said modification function; and iterating said transforming, determining, specifying, determining, computing, and altering steps until said compound mutual information is maximized, wherein said computing further comprises; (1) extracting a set of global marginal densities from a set of global features and a set of zonal marginal densities from said set of zonal features, and (2) applying weighting coefficients to said sets of marginal densities to provided weighted marginal mutual information, and aggregating said weighted marginal mutual information in accordance with the formula;
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Specification