CN103514592A - Sea reef remote-sensing image mosaic method on basis of sea spray indexes for network service - Google Patents
Sea reef remote-sensing image mosaic method on basis of sea spray indexes for network service Download PDFInfo
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Abstract
The invention relates to a sea reef remote-sensing image mosaic method on basis of sea spray indexes for a network service. According to the method, a sea spray index calculation model is adopted, a sea reef remote-sensing image is cut along a sea spray zone and is published on the internet in a Web service mode, and effective mosaic of the sea reef remote-sensing image and basic background data of a sea broad environment in the network environment is achieved. The method includes the steps that firstly, a network service system background program carries out cutting calculation processing along the sea spray zone on the received sea reef remote-sensing image by means of the sea spray index calculation model, then the cut sea reef image is published as Web service in a WMS mode, a service URL address is transmitted to a front-end program of a network service system in an XML file format, and ultimately, the URL address of the sea reef Web service is dynamically loaded to the basis background data of the sea broad environment by means of the front-end program of the network service system, and the sea reef image mosaic process along the sea spray zone is achieved.
Description
Technical field
The invention belongs to based Interpretation of Remote Sensing Images image processing research field, relate to the remote sensing image sea island reef method for embedding of a kind of network-oriented service, particularly relate to and a kind ofly adopt the mode of spray index to set up the method for inlaying sea island reef along spray zone while serving by internet delivery network.
Background technology
Sea island reef is that the base of making a long, arduous journey of human development ocean has important realistic meaning and strategic value with national security and the ocean development of the important component part ，Dui China in fulcrum ，Shi China territory of advancing.For safeguarding China's maritime rights and interests, advance " digital ocean " to build, carry out comprehensively, rapidly sea island reef investigation and just seem particularly important with dynamic monitoring work.Yet because China's sea island reef distribution is scattered, land on the island difficulty, being therefore difficult to carry out mapping according to conventional method obtains sea island reef data.Remote sensing image has that spatial resolution is high, simultaneous observation area is large and the advantage such as acquisition time is short, and cost is relatively low, can significantly reduce required human and material resources, financial resources and time, this just makes to carry out sea island reef dynamic monitoring by based Interpretation of Remote Sensing Images technology becomes possibility.Development and dynamic monitoring for a long time along with high resolving power earth observation systems, China has accumulated a considerable amount of sea island reef remote sensing image datas, and set up sea island reef information management system, realized and provide science data to the highly efficient, unified ，Bing Wei of the Organization And Management related management department of sea island reef remote sensing image data.For current focus marine site, also there are minority She Hai department and scientific research institution by internet, to issue Monitoring Result and the thematic information of emphasis sea island reef, and set up based on this integrated information network service system, can realize three-dimensional visualization and the simulation of Adjacent Sea Area three-dimensional scenic thereof of emphasis sea island reef, be expected to provide support for island, shoal and coral reef exploitation and the aid decision making of marine economy development.
By internet, sea island reef Monitoring Result and thematic information are published on network, the subject matter facing is how sea island reef remote sensing image data to be mounted under the basic background data of ocean overall situation, makes it to melt as a whole.Existing remote sensing image method for embedding is that several images are stitched together, and forms the large-scale complete image of a width, comprises several steps such as geometric accurate correction, how much splicings, integral color adjustment and splicing line processing.But, the basic background data of ocean overall situation has its singularity, it is base map and being present in advance in network service system as a setting, therefore can not as splicing several images, adopt existing method for embedding that the basic background data of sea island reef image and ocean overall situation is done to damascene.At present, most of network service systems are just superimposed upon sea island reef image data on the basic background data of ocean overall situation simply, as the sea island reef image data providing in Google Earth, the basic background data like patch ，Yu ocean overall situation is seriously unbalanced on tone to cause sea island reef image to seem to seem.Present obvious patch shape when eliminating the basic background data of sea island reef image mosaic Yu Haiyang overall situation, the present invention is the splicing line when inlaying using spray zone, and for high resolving power sea island reef remote sensing image, the method of employing based on spray index cuts sea island reef image along spray zone, the finally form issue with Web service by the sea island reef image result cutting is embedded in the basic background data of ocean overall situation after service dynamic load.
Summary of the invention
The technical problem to be solved in the present invention is: overcome existing sea island reef image mosaic shortcoming during marine background base map in network service system, a kind of method of inlaying sea island reef image along spray zone in network-oriented service system is provided, its can with speed faster in real time, dynamically by sea island reef image mosaic Yu Haiyang background base map, can obtain good expression effect.
In order to overcome the above problems, the sea island reef remote sensing image based on spray index of a kind of network-oriented service provided by the invention is embedded in the technical method of ocean overall situation background base map, comprises the following steps:
Step 1, the background program of network service system is receiving high definition sea island reef remote sensing image data periodically, and its data layout is the remote sensing image of * .img, * .GIF;
Step 2, for high resolving power sea island reef remote sensing image, network service system background program utilizes this feature of separatrix of spray zone sea island reef and marine background base map when inlaying, the mode that employing is calculated based on spray index, successively every width sea island reef image is done to computing, realized along spray zone and cut sea island reef remote sensing image.This step comprises several processing links such as the band selection of sea island reef remote sensing image, spray exponential model structure, spray index ratio calculation, Threshold segmentation, image reclassification, image mask;
Step 3, by the sea island reef image result cutting along spray zone, the form with Web service is published on internet the background program of network service system, simultaneously by the URL address transfer of service to the Front End of network service system, for the Front End dynamic load of network service system;
Step 4, the Front End of network service system, according to the URL address of sea island reef Web service, to the basic background data of ocean overall situation, has been realized the sea island reef image mosaic process along spray zone by its dynamic load.
In further described step 2, the method that acquisition cuts sea island reef remote sensing image along spray zone is as follows:
Step a, according to the curve of spectrum of sea island reef remote sensing image, carries out wave band analysis, selection.Due to seawater to the reflectivity of incident light can approximate representation be blue light > green glow > ruddiness > near infrared > and in infrared, and high resolving power sea island reef image in the present invention only has three wave bands of red, green, blue, so the present invention selects strong reflection blue wave band to be two with the most weak reflect red wave band to calculate wave bands;
Step b, according to index calculation method principle, builds spray index computation model, the two wave band reflectance values of selecting are subtracted each other respectively and addition calculation, and by ratio computing, further expand the gap of the two, thus strengthen the brightness of background seawater, suppress sea island reef information.The spray exponential model building in the present invention is NDSI=(Blue-Red)/(Blue+Red), wherein Blue represents blue wave band, Red represents red spectral band;
Step c, according to the spray exponential model of setting up in step b, by the blue light of high resolving power sea island reef image and two wave band substitution computing formula of ruddiness, carries out grid ratio calculating, each pixel cell is tried to achieve to its corresponding ratio, obtains result of calculation;
Steps d, is classified the result of calculation of spray exponential model, and rule of thumb formula is set respective threshold, isolates water body and sea island reef;
Step e, does reclassification to sorted result image and calculates, and with 0 value representation water body, with 1 value representation sea island reef, thereby generates bianry image;
Step f, the bianry image utilize generating, does mask computing to original sea island reef image, does the grid calculating of multiplying each other with original sea island reef image, and the result obtaining is the sea island reef image cutting along spray zone.
The present invention's advantage is compared with prior art: at net environment, because the basic background data of ocean overall situation is present in network service system as base map in advance, cause the existing remote sensing image method for embedding by network when by the basic background data of sea island reef image mosaic Yu Haiyang overall situation, to occur significantly splicing vestige (shown in Fig. 1), disposal route in Google Earth is also just superimposed on sea island reef image (shown in Fig. 2) on marine background base map simply, due to seriously inhomogeneous on tone, thereby form a patch.The present invention is by cut sea island reef image along spray zone, and the form with service is published on internet by result image, by service dynamic load, has realized net environment by the basic background data of sea island reef image mosaic Yu Haiyang overall situation.Because the present invention adopts spray zone as the separatrix of sea island reef and seawater background, can be excessively natural while making to inlay, sea island reef, the spray, background seawater combine together (shown in Fig. 7, Fig. 8), especially in three-dimensional sphere, be combined while carrying out visual demonstration with corresponding dem data, can obtain good expression effect.
Accompanying drawing explanation
Fig. 1 is the splicing vestige schematic diagram that existing method forms while inlaying;
Fig. 2 is the schematic diagram of sea island reef image mosaic Yu Haiyang background base map in Google Earth;
Fig. 3 is the block diagram of this method;
Fig. 4 is the image result figure after spray exponential model calculates;
Fig. 5 is the sea island reef image result figure after binaryzation;
Fig. 6 is that binaryzation image and original sea island reef image are done the result striograph after mask computing;
Fig. 7 is the two-dimensional visualization schematic diagram adopting after the sea island reef image mosaic of this method;
Fig. 8 is the visual schematic diagram of three-dimensional sphere adopting after the sea island reef image mosaic of this method.
Embodiment
In order to realize better foregoing invention object, below in conjunction with the block scheme of Fig. 3, each step in the present invention is described further:
Step 1, puts into a fixed storage catalogue by the high resolving power sea island reef remote sensing image data receiving at every turn, and the background program of network service system is periodically done batch processing to the image data in fixed storage catalogue;
Step 2, for high resolving power sea island reef remote sensing image, network service system background program adopts the mode of calculating based on spray index, successively every width sea island reef image is done to computing, realization cuts along the sea island reef image of spray zone, comprises several processing links such as the band selection of sea island reef remote sensing image, spray exponential model structure, spray index ratio calculation, Threshold segmentation, image reclassification, image mask.Concrete treatment step is as follows:
First, the background program of network service system, according to selected blue wave band and red spectral band, reads single band image data corresponding in high resolving power sea island reef remote sensing image, i.e. the data of triband and the first wave band;
Then, the background program of network service system is according to the spray exponential model formula NDSI=(Blue-Red building)/(Blue+Red), take blue wave band and red spectral band matrix as input data, each pixel cell is done to ratio calculation, the image result obtaining as shown in Figure 4;
Then, the background program of network service system, according to the segmentation threshold of setting, is classified above-mentioned ratio calculation result.Experimental formula shows, when Threshold is 0.05098, the effect of separated sea island reef and seawater is best.Subsequently, to sorted ratio calculation result, the pixel cell that is greater than this threshold value is set to 1 value, represents sea island reef, and the pixel cell that is less than this threshold value is set to 0 value, represents seawater, generates the bianry image of sea island reef, as shown in Figure 5;
Finally, the background program of network service system utilizes above-mentioned bianry image, does the grid calculating of multiplying each other with each wave band of original sea island reef image, and the result obtaining is the sea island reef image cutting along spray zone, as shown in Figure 6.
Step 3, the background program of network service system is issued into Web service by the above-mentioned sea island reef image cutting along spray zone with WMS form, the URL address of service is transferred to the Front End of network service system with XML file layout simultaneously;
Step 4, the Front End of network service system is according to the URL address of sea island reef Web service, by its dynamic load to the basic background data of ocean overall situation, realized the sea island reef image mosaic process along spray zone, Fig. 7 is the two-dimensional visualization on the basic background data of sea island reef image mosaic Yu Haiyang overall situation, and Fig. 8 is that the three-dimensional sphere on the basic background data of sea island reef image mosaic Yu Haiyang overall situation is visual.
Non-elaborated part of the present invention belongs to those skilled in the art's known technology.
The above; it is only the embodiment in the present invention; but protection scope of the present invention is not limited to this; any people who is familiar with this technology is in the disclosed technical scope of the present invention; can understand conversion or the replacement expected; all should be encompassed in of the present invention comprise scope within, therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (2)
1. the sea island reef remote sensing image method for embedding based on spray index of network-oriented service, it is characterized in that, network service system background program adopts the mode of calculating based on spray index, sea island reef image is done to the processing that cuts along spray zone, and the form issue with Web service by the sea island reef image result cutting, network service system Front End is by service dynamic load, by sea island reef image mosaic, in the background data of the ocean of network service system overall situation basis, concrete steps are as follows:
(1) background program of network service system receiving high definition sea island reef remote sensing image data periodically, its data layout is the remote sensing image of * .img, * .GIF;
(2) for high resolving power sea island reef remote sensing image; network service system background program utilizes this feature of separatrix of spray zone sea island reef and marine background base map when inlaying; the mode that employing is calculated based on spray index; successively every width sea island reef image is done to computing, obtain and cut sea island reef remote sensing image along spray zone; This step comprises the band selection of sea island reef remote sensing image, spray exponential model structure, spray index ratio calculation, Threshold segmentation, image reclassification, the several processing links of image mask;
(3) by the sea island reef image result cutting along spray zone, the form with Web service is published on internet the background program of network service system, simultaneously by the URL address transfer of service to the Front End of network service system, for the Front End dynamic load of network service system;
(4) Front End of network service system, according to the URL address of sea island reef Web service, to the basic background data of ocean overall situation, has been realized the sea island reef image mosaic process along spray zone by its dynamic load.
2. method according to claim 1, is characterized in that: in described step (2), obtain that along spray zone, to cut the method for sea island reef remote sensing image as follows:
Step a, according to the curve of spectrum of sea island reef remote sensing image, carries out wave band analysis, selects strong reflection blue wave band and the most weak reflect red wave band to be two and calculates wave bands;
Step b, according to index calculation method principle, builds spray index computation model, the two wave band reflectance values of selecting are subtracted each other respectively and addition calculation, and by ratio computing, further expand the gap of the two, and strengthen the brightness of background seawater, suppress sea island reef information; The spray exponential model of described structure is NDSI=(Blue-Red)/(Blue+Red), wherein Blue represents blue wave band, Red represents red spectral band;
Step c, according to the spray exponential model of setting up in step b, by the blue light of high resolving power sea island reef image and two wave band substitution computing formula of ruddiness, carries out grid ratio calculating, each pixel cell is tried to achieve to its corresponding ratio, obtains result of calculation;
Steps d, is classified the result of calculation of spray exponential model, and rule of thumb formula is set respective threshold, isolates water body and sea island reef;
Step e, does reclassification to sorted result image and calculates, and with 0 value representation water body, with 1 value representation sea island reef, thereby generates bianry image;
Step f, the bianry image utilize generating, does mask computing to original sea island reef image, does the grid calculating of multiplying each other with original sea island reef image, and the result obtaining is the sea island reef image cutting along spray zone.
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