Tonal balancing of multiple images
First Claim
1. A method for tonally balancing an image mosaic, comprising:
- supplying the image mosaic, the image mosaic having multiple overlap regions;
identifying in the overlap regions a set of corresponding points, the corresponding points corresponding to a single location and being indicative of a tonal variation;
establishing a tonal variation threshold;
eliminating from the overlap regions a subset of corresponding points, the subset having tonal variation deviating from the tonal variation threshold;
repeating the eliminating until substantially all subsets have been eliminated,producing adjusted overlap regions comprising a set of remaining corresponding points;
obtaining gains and biases for each spectral band in the adjusted overlap regions;
applying the gains and biases to transform intensities of the set of remaining corresponding points producing transformed corresponding points; and
producing a tonally balanced image mosaic using the transformed corresponding points.
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Abstract
Method for tonally balancing a image mosaic includes supplying the image mosaic which has multiple overlap regions; identifying in the overlap regions a set of corresponding points that correspond to a single location and are indicative of a tonal variation; establishing a tonal variation threshold; eliminating from the overlap regions a subset of corresponding points, the subset having tonal variation deviating from the tonal variation threshold; repeating the eliminating until substantially all subsets have been eliminated, producing adjusted overlap regions that include a set of remaining corresponding points; obtaining gains and biases for each spectral band in the adjusted overlap regions; applying the gains and biases to transform intensities of the set of remaining corresponding points, producing transformed corresponding points; and producing a tonally balanced image mosaic using the transformed corresponding points.
37 Citations
14 Claims
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1. A method for tonally balancing an image mosaic, comprising:
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supplying the image mosaic, the image mosaic having multiple overlap regions; identifying in the overlap regions a set of corresponding points, the corresponding points corresponding to a single location and being indicative of a tonal variation; establishing a tonal variation threshold; eliminating from the overlap regions a subset of corresponding points, the subset having tonal variation deviating from the tonal variation threshold; repeating the eliminating until substantially all subsets have been eliminated, producing adjusted overlap regions comprising a set of remaining corresponding points; obtaining gains and biases for each spectral band in the adjusted overlap regions; applying the gains and biases to transform intensities of the set of remaining corresponding points producing transformed corresponding points; and producing a tonally balanced image mosaic using the transformed corresponding points. - View Dependent Claims (2, 3, 4, 5)
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6. A computer-readable medium having stored thereon instructions that when executed by the computer cause the computer to tonally balance a set of overlapping images by:
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using a subset of corresponding points in each of a plurality of image overlap regions to solve a set of minimization equations for gains and biases for each spectral band of each image, the corresponding points being points from different images having locations that correspond to each other, the subset of corresponding points consisting of corresponding points whose intensities differ less than a threshold; applying the gains and biases to the images; iterating the using and applying actions for a predetermined number of iterations, the iterating resulting in an iterated gain and an iterated bias for each spectral band of each image; transforming intensities of points for each spectral band in each image using the iterated gain and the iterated bias for the corresponding spectral band to produce transformed intensities of points; and producing a tonally balanced image mosaic by using the transformed intensities of points in the images. - View Dependent Claims (7, 8, 9, 10)
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11. A computer-readable medium having stored thereon instructions that when executed by the computer cause the computer to tonally balance an image mosaic, by:
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supplying the image mosaic, the image mosaic having multiple overlap regions; identifying in the overlap regions a set of corresponding points, the corresponding points corresponding to a single location and being indicative of a tonal variation; establishing a tonal variation threshold; eliminating from the overlap regions a subset of corresponding points, the subset having tonal variation deviating from the tonal variation threshold; repeating the eliminating until substantially all subsets have been eliminated, producing adjusted overlap regions comprising a set of remaining corresponding points; obtaining gains and biases for each spectral band in the adjusted overlap regions; applying the gains and biases to transform intensities of the set of remaining corresponding points producing transformed corresponding points; and producing a tonally balanced image mosaic using the transformed corresponding points. - View Dependent Claims (12, 13, 14)
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Specification