CN104077755A - Remote sensing lithological information enhancement method based on chromatic aberration - Google Patents
Remote sensing lithological information enhancement method based on chromatic aberration Download PDFInfo
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- CN104077755A CN104077755A CN201410327031.8A CN201410327031A CN104077755A CN 104077755 A CN104077755 A CN 104077755A CN 201410327031 A CN201410327031 A CN 201410327031A CN 104077755 A CN104077755 A CN 104077755A
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Abstract
The invention belongs to the field of remote sensing geological surveys, and particularly relates to a remote sensing lithological information enhancement method based on chromatic aberration. The method aims to highlight lithological differences in a targeted mode. The method includes the steps that remote sensing images are obtained; aiming at a lithological character X and a lithological character Y which are different, image spectral curves of the two lithological characters are obtained, and brightness values of all bands are obtained; in the bands, three bands are selected at will to be combined, and various band combination images are formed; the chromatic value H of the lithological character X and the chromatic value H' of the lithological character Y in each band combination image are calculated; the chromatic aberration delta H of the two lithological characters in each band combination image is worked out; values of the chromatic aberration delta H of all the band combination images are compared, the combination image with the maximum chromatic aberration is found out, and saturability enhancement processing is carried out on the combination image with the maximum chromatic aberration. According to the method, all possible color differences of the two lithological characters on the band combination images can be figured out, color composite images of certain three bands are selected, and the maximum color difference of the two lithological characters can be achieved.
Description
Technical field
The invention belongs to Remote Sensing Geological Investigation field, be specifically related to a kind of Remote Sensing Lithologic information Enhancement Method based on aberration.
Background technology
In remote-sensing geology application aspect, image enhancement processing method can be divided into spectral signature enhancing and space characteristics strengthens, wherein lithological information enhancing be take spectral signature enhancing as main, comprise: the methods such as band combination conversion, ratio processing, principal component transform, HLS conversion, contrast enhancing, the lithological information that they all acquire a certain degree conventionally strengthens effect.Yet, for the lithology in a certain area, which kind of Enhancement Method better effects if on earth, most of situation is all just can learn by Experimental Comparison constantly, has certain blindness.
In the actual application of Remote Sensing Lithologic information Enhancement Method, during in the face of multiwave Multi-spectral Remote Sensing Data (as WorldView-2) or high-spectrum remote sensing data (as CASI/SASI), method based on spectral signature is also varied, strengthen to process and lack specific aim, and method is selected and the impact of human factor all may to cause strengthening on image lithology difference obvious not, be unfavorable for further remote-sensing geology decipher work.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, for outstanding lithology difference targetedly, provide on a kind of effective enhancing remote sensing image the method for difference between different lithology.
Technical scheme of the present invention is as described below:
A Remote Sensing Lithologic information Enhancement Method based on aberration, comprises the steps:
The first step, obtain remote sensing image, and remote sensing image is carried out to pre-service, obtain pretreated remote sensing image; Pre-service comprises radiant correction, atmospheric correction and geometry correction; The wave band number of pretreated remote sensing image is n;
Second step, for X, two kinds of different lithology of Y, on pretreated remote sensing image, obtain the image curve of spectrum of two kinds of lithology, on the image curve of spectrum, value corresponding to each wave band position is exactly the brightness value of this wave band;
The 3rd step, in n wave band of pretreated remote sensing image, select arbitrarily 3 wave bands to combine, form multiple different band combination image;
The 4th step, calculate X in every kind of band combination image, two kinds of lithology chromatic value H of Y and H ';
The 5th step, calculate the aberration △ H of two kinds of lithology in every kind of band combination image, formula is as follows:
In the 6th step, more various band combination image, the aberration △ H of two kinds of lithology is big or small, finds out the combination image of aberration maximum, it is carried out to saturation degree and strengthen processing.
A kind of Remote Sensing Lithologic information Enhancement Method based on aberration as above, wherein: in described the 4th step, the calculation method of X lithology chromatic value H is as follows:
Step (4.1) supposes to have selected i, j, K-band to combine, and on this band combination image, the brightness value of X lithology is X
i, X
j, X
k; Wherein, i, j, k are the integer between 1～n;
Step (4.2) makes r=X
i; G=X
j; B=X
k; Wherein, r, g, b represent the value of the red, green, blue passage of band combination image;
The maximum in step (4.3) r, g, b is max, and reckling is min;
The chromatic value of step (4.4) X lithology
Step (4.5) calculates the chromatic value H ' of Y lithology by identical method, be about to X
i, X
j, X
kbe replaced by Y
i, Y
j, Y
k.
Beneficial effect of the present invention is:
By the method, can calculate the size of the heterochromia of two kinds of lithology on all possible band combination image, thereby select the color composite image of certain three wave band, make the heterochromia of these two kinds of lithology reach maximum.In further remote-sensing geology decipher work, utilize this image, just can distinguish at an easy rate this two kinds of lithology, find the lithologic boundary between them.
Embodiment
Below in conjunction with embodiment, a kind of Remote Sensing Lithologic information Enhancement Method based on aberration provided by the invention is elaborated.
The first step, obtains remote sensing image, and remote sensing image is carried out to pre-service, obtains pretreated remote sensing image; Pre-service comprises radiant correction, atmospheric correction and geometry correction successively; The wave band number of pretreated remote sensing image is n;
Second step for X, two kinds of different lithology of Y, obtains the image curve of spectrum of two kinds of lithology on image, and on curve, value corresponding to each wave band position is exactly the brightness value of this wave band, that is: lithology X is respectively X at the brightness value of each wave band
1, X
2, X
3... X
n, lithology Y is respectively Y at the brightness value of each wave band
1, Y
2, Y
3... Y
n;
The 3rd step, utilizes in n wave band of remote sensing image, selects arbitrarily 3 wave bands to combine, and can form
plant different band combination images;
The 4th step, calculates X in every kind of band combination image, two kinds of lithology chromatic value H of Y and H ', take X lithology as example, and computing method are as follows:
(1) suppose to have selected i, j, K-band to combine, on this band combination image, the brightness value of X lithology is X
i, X
j, X
k.Wherein, i, j, k are the integer between 1～n;
(2) r=X
i; G=X
j; B=X
k; Wherein, r, g, b are constant, represent the value of the red, green, blue passage of band combination image;
(3) the maximum in r, g, b is max, and reckling is min;
(3) chromatic value of X lithology
(4) by identical method, calculate the chromatic value H ' of Y lithology.
The 5th step, calculates the aberration △ H of two kinds of lithology on every kind of band combination image, and formula is as follows:
The 6th step, on more various band combination images, the aberration △ H of two kinds of lithology is big or small, finds out the combination image of aberration maximum, it is carried out to saturation degree and strengthen processing.
Claims (2)
1. the Remote Sensing Lithologic information Enhancement Method based on aberration, comprises the steps:
The first step, obtain remote sensing image, and remote sensing image is carried out to pre-service, obtain pretreated remote sensing image; Pre-service comprises radiant correction, atmospheric correction and geometry correction; The wave band number of pretreated remote sensing image is n;
Second step, for X, two kinds of different lithology of Y, on pretreated remote sensing image, obtain the image curve of spectrum of two kinds of lithology, on the image curve of spectrum, value corresponding to each wave band position is exactly the brightness value of this wave band;
The 3rd step, in n wave band of pretreated remote sensing image, select arbitrarily 3 wave bands to combine, form multiple different band combination image;
The 4th step, calculate X in every kind of band combination image, two kinds of lithology chromatic value H of Y and H ';
The 5th step, calculate the aberration △ H of two kinds of lithology in every kind of band combination image, formula is as follows:
In the 6th step, more various band combination image, the aberration △ H of two kinds of lithology is big or small, finds out the combination image of aberration maximum, it is carried out to saturation degree and strengthen processing.
2. a kind of Remote Sensing Lithologic information Enhancement Method based on aberration as claimed in claim 1, is characterized in that: in described the 4th step, the calculation method of X lithology chromatic value H is as follows:
Step (4.1) supposes to have selected i, j, K-band to combine, and on this band combination image, the brightness value of X lithology is X
i, X
j, X
k; Wherein, i, j, k are the integer between 1～n;
Step (4.2) makes r=X
i; G=X
j; B=X
k; Wherein, r, g, b represent the value of the red, green, blue passage of band combination image;
The maximum in step (4.3) r, g, b is max, and reckling is min;
The chromatic value of step (4.4) X lithology
Step (4.5) calculates the chromatic value H ' of Y lithology by identical method, be about to X
i, X
j, X
kbe replaced by Y
i, Y
j, Y
k.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383348A (en) * | 2013-05-28 | 2013-11-06 | 吉林大学 | Method for extracting altered mineral at vegetation-covered areas by hyperspectral remote sensing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383348A (en) * | 2013-05-28 | 2013-11-06 | 吉林大学 | Method for extracting altered mineral at vegetation-covered areas by hyperspectral remote sensing |
Non-Patent Citations (3)
| Title |
|---|
| 宋晚郊等: "《东昆仑造山带巴颜喀拉山群ASTER岩性信息提取》", 《现代地质》 * |
| 许领等: "《地质灾害调查中ETM+与SPOT-5 Pan融合方法比较》", 《遥感技术与应用》 * |
| 金剑等: "《基于地物光谱分析的WorldView-2数据岩性识别:以新疆乌鲁克萨依地区为例》", 《现代地质》 * |
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