IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0376920
(2010-06-28)
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등록번호 |
US-8639056
(2014-01-28)
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국제출원번호 |
PCT/US2010/001848
(2010-06-28)
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§371/§102 date |
20111208
(20111208)
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국제공개번호 |
WO2011/008239
(2011-01-20)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
13 |
초록
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A method according to the invention enhances contrast of an image by accessing an original image, and establishing, assigning, or initializing pixel values and pixel coordinates of pixels of the image. Then, a Laplacian pyramid having an integral number of levels is generated for the image. A contra
A method according to the invention enhances contrast of an image by accessing an original image, and establishing, assigning, or initializing pixel values and pixel coordinates of pixels of the image. Then, a Laplacian pyramid having an integral number of levels is generated for the image. A contrast boost pyramid is generated and applied to the Laplacian pyramid to obtain a modified Laplacian pyramid wherein values in the levels of the Laplacian pyramid are enhanced. An enhanced image is then constructed from the modified Laplacian pyramid.
대표청구항
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1. A method for enhancing contrast of an image comprising: accessing at least one original image;generating a multi-scale signal representation of the at least one original image having an integral number of levels;processing the at least one original image responsive to the multi-scale representati
1. A method for enhancing contrast of an image comprising: accessing at least one original image;generating a multi-scale signal representation of the at least one original image having an integral number of levels;processing the at least one original image responsive to the multi-scale representation to generate at least one enhanced image; andgenerating a pyramid representation of the at least one original image to form the multi-scale signal representation of the at least one original image;wherein a bandpass pyramid methodology is employed to generate the pyramid representation, the pyramid representation is a Laplacian pyramid Ik, where k={1, . . . , K} and K is the number of levels in the Laplacian pyramid;wherein a contrast boost pyramid Bk is generated, the contrast boost pyramid being a function that changes the Laplacian pyramid non-linearly when applied thereto;wherein a power function is generated to generate the contrast boost pyramid, the power function being expressed as {Bk(i,j)=1k=KBk(i,j)=(Ik(i,j)α)β-1k={1,…,K-1} wherein shape controller α is in the range [0,1] and boost intensity β is a positive number in the range [0,2]. 2. The method of claim 1, further comprising the step of selecting and applying a value of β that is less than 1 to enhance contrast. 3. The method of claim 1, further comprising the step of selecting and applying a value of β that is greater than 1 to reduce contrast. 4. A method for enhancing contrast of an image comprising: accessing at least one original image;generating a multi-scale signal representation of the at least one original image having an integral number of levels;processing the at least one original image responsive to the multi-scale representation to generate at least one enhanced image;generating a pyramid representation of the at least one original image to form the multi-scale signal representation of the at least one original image; wherein a bandpass pyramid methodology is employed to generate the pyramid representation; wherein the pyramid representation is a Laplacian pyramid Ik, where k={1, . . . , K} and K is the number of levels in the Laplacian pyramid; wherein a contrast boost pyramid Bk is generate, the contrast boost pyramid being a function that changes the Laplacian pyramid non-linearly when applied thereto; andapplying the contrast boost pyramid Bk to Laplacian pyramid as follows: Jk(i,j)=Ik(i,j)*Bk(i,j) wherein Jk is a kth level of a pyramid of an enhanced image. 5. The method of claim 4, further comprising the steps of: accessing more than one original image;generating Laplacian pyramids and corresponding contrast boost pyramids associated with each of the original images, thereby creating a boosted Laplacian pyramid for each image;fusing the boosted Laplacian pyramids to create a composite image which according to Tk(i,j)=∑nInk(i,j)·Wnk(i,j) wherein Wnk is a Gaussian pyramid weight corresponding to each of the original images. 6. The method of claim 4, further comprising the steps of: accessing more than one original image;generating Laplacian pyramids and corresponding contrast boost pyramids associated with each of the original images, thereby creating a boosted Laplacian pyramid for each image;fusing the boosted Laplacian pyramids to create a composite image according to Tk(i,j)=∑nInk(i,j)·Wnk(i,j)·Bnk(i,j)wherein Wnk is a Gaussian pyramid weight corresponding to each of the original images and Bnk, is the contrast boost pyramid of image In. 7. A method comprising: accessing at least one original image;generating a multi-scale signal representation of the at least one original image having an integral number of levels;processing the at least one original image responsive to the multi-scale representation;applying a user command responsive to the multi-scale representation through a user interface to generate at least one enhanced image;generating a pyramid representation of the at least one original image to form the multi-scale signal representation of the at least one original image;employing a bandpass pyramid methodology to generate the pyramid representation, wherein the pyramid representation is a Laplacian pyramid Ik, where k={1, . . . , K} and K is the number of levels in the Laplacian pyramid;generating a contrast boost pyramid Bk, the contrast boost pyramid being a function that changes the Laplacian pyramid non-linearly when applied thereto; andemploying a power function to generate the contrast boost pyramid, the power function being expressed as {Bk(i,j)=1k=KBk(i,j)=(Ik(i,j)α)β-1k={1,…,K-1} wherein shape controller α is in the range [0,1] and boost intensity β is a positive number in the range [0,2]. 8. The method of claim 7, wherein in the applying a user command step the user selects at one value of β and/or one value of α through the user interface to increase contrast in at least one portion of an image.
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