METHOD AND APPARATUS FOR GENERATING HIGH DYNAMIC RANGE IMAGE
First Claim
1. A method for generating a High Dynamic Range, HDR, image, comprising:
- obtaining a set of two or more input images, the two or more input images including a reference image and one or more non-reference images;
for each of the one or more non-reference images, performing an image analysis which comprises, for each region of a plurality of regions of the non-reference image, assessing whether the region of the non-reference image and a corresponding region of the reference image show the same image content and declaring the region of the non-reference image as valid or as invalid based on the assessment; and
generating the HDR image by fusing the reference image and the one or more non-reference images, wherein the fusing comprises, for each of the one or more non-reference images, disregarding the invalid regions of the respective non-reference image;
wherein the image analysis comprises;
generating a difference image of the non-reference image by subtracting the non-reference image from the reference image or vice versa; and
generating a contrast-enhanced difference image by applying a contrast enhancing transformation to the difference image;
wherein the assessing is on the basis of the contrast-enhanced difference image.
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Abstract
A method and an apparatus for generating a High Dynamic Range, HDR, image are proposed. The method comprises obtaining a set of two or more input images, the two or more input images including a reference image and one or more non-reference images; for each of the one or more non-reference images, performing an image analysis which comprises, for each region of a plurality of regions of the non-reference image, assessing whether the region of the non-reference image and a corresponding region of the reference image show the same image content and declaring the region of the non-reference image as valid or as invalid based on the assessment; and generating the HDR image by fusing the reference image and the one or more non-reference images, wherein the fusing comprises, for each of the one or more non-reference images, disregarding the invalid regions of the respective non-reference image.
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Citations
13 Claims
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1. A method for generating a High Dynamic Range, HDR, image, comprising:
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obtaining a set of two or more input images, the two or more input images including a reference image and one or more non-reference images; for each of the one or more non-reference images, performing an image analysis which comprises, for each region of a plurality of regions of the non-reference image, assessing whether the region of the non-reference image and a corresponding region of the reference image show the same image content and declaring the region of the non-reference image as valid or as invalid based on the assessment; and generating the HDR image by fusing the reference image and the one or more non-reference images, wherein the fusing comprises, for each of the one or more non-reference images, disregarding the invalid regions of the respective non-reference image; wherein the image analysis comprises; generating a difference image of the non-reference image by subtracting the non-reference image from the reference image or vice versa; and generating a contrast-enhanced difference image by applying a contrast enhancing transformation to the difference image; wherein the assessing is on the basis of the contrast-enhanced difference image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13)
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11. An apparatus for generating a High Dynamic Range, HDR, image, comprising:
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an obtaining unit configured to obtain a set of two or more input images, the two or more input images including a reference image and one or more non-reference images; an analysis unit configured to perform, for each of the one or more non-reference images, an image analysis which comprises, for each region of a plurality of regions of the non-reference image, assessing whether the region of the non-reference image and a corresponding region of the reference image show the same image content and declaring the region of the non-reference image as valid or as invalid based on the assessment; and a generating unit configured to generate the HDR image by fusing the reference image and the one or more non-reference images, wherein the fusing comprises, for each of the one or more non-reference images, disregarding the invalid regions of the respective non-reference image; wherein the analysis unit is configured to perform the image analysis by; generating a difference image of the non-reference image by subtracting the non-reference image from the reference image or vice versa; and generating a contrast-enhanced difference image by applying a contrast enhancing transformation to the difference image; wherein the assessing is on the basis of the contrast-enhanced difference image.
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Specification