CN102063478A - Three-dimensional file format conversion method and search engine suitable for Internet search - Google Patents
Three-dimensional file format conversion method and search engine suitable for Internet search Download PDFInfo
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Abstract
The invention discloses a three-dimensional file format conversion method suitable for Internet search, which comprises the following steps of: (1) receiving three-dimensional model files; (2) judging the formats of the three-dimensional model files, and selecting corresponding processing modules for converting according to the different file formats; (3) processing the files by the corresponding processing modules and converting the files into files in a uniform format by a conversion module; (4) extracting basic characteristics of the converted files and storing the extracted basic characteristics in a basic characteristic table of the files in a uniform format; and (5) finally obtaining the files in a uniform format. A three-dimensional search engine based on the conversion method comprises the following steps of: (1) establishing indexes based on the files in a uniform format to obtain a database containing characteristic data and the corresponding format index files of the files in a uniform format; (2) submitting search key words or search characteristics; (3) extracting the characteristic data for search according to the key words or search characteristics submitted by a user; and (4) comparing the key words or search characteristics submitted by the user with the characteristic data in the database to obtain search results.
Description
Technical field
The invention belongs to the computer graphic image technical field,, relate to various three dimensional file forms and data search in a plurality of applications in conjunction with 3-D view analyzing and processing technology.
In the 3-D view processing technology field, propose after the search engine index establishment stage just is converted to consolidation form with the 3 dimensional format file layout of each application warehouse-in again, can be applicable to the three-dimensional modeling data search of each application industry such as academic research, industrial design, finite element analysis, 3D animation etc.
Background technology
The multimedia display technology of internet has developed many decades, is shown to picture, sound preview again to video preview from simple literal, and people have been used on the browser the more surf time.Along with the extendability support of browser, providing of formula interface is provided, the application plug-in program of flash animation, video and every profession and trade makes that the function of browser is abundanter.Along with the development of Internet technology, 3-D view is come into daily life, 3d gaming, 3D film etc.In fact, three-dimensional model is used widely in scientific research, industry and medical science and business activity already.
Simultaneously, along with internet shared resource magnanimity increases, internet search engine has become people and has obtained the Internet resources necessary tool, and the information that the rapid and precise user of searching of energy wants has become the main criterion of various commercialization search engines.
Yet, though present the Internet search technology is quite ripe aspect two-dimensional signal retrievals such as picture, text, to the search of three-dimensional resource also in developing stage.This is because most three dimensional file forms (stl, vrml etc.) design for visual, only comprises visualization feature such as how much of object, surface in the file, does not comprise specially to be fit to the Text Flag information of mating automatically.Though can add some Word messages to model as the autocad file form, this method often has subjective factor, and be not suitable for the standardisation process of model index.Owing to do not have ripe search engine for supporting, search very difficulty of required three-dimensional model at huge lane database.Therefore, research three-dimensional model search technique helps the user to obtain the three-dimensional model that meets design idea rapidly and accurately, realizes resource reuse, becomes the focus of current research.
Summary of the invention
Search for three-dimensional modeling data fast and accurately in order to be implemented in the internet, and on browser fast browsing, observe three-dimensional model, the present invention proposes a kind of internet hunt three dimensional file format conversion system that is applicable to, and a kind of new three-dimensional search engine based on this format conversion system, concrete technical scheme is as follows:
A kind of three dimensional file format conversion method that is applicable to internet hunt, step comprises:
1) receives the three-dimensional model file;
2) judge the three-dimensional model file layout, change according to the corresponding processing module of file layout different choice;
3) corresponding file is sent into the alignment processing module and is handled; Carry out parameter setting simultaneously, the details the during file of this parameter control transformation consolidation form abandons degree;
Described processing module has multiple, respectively corresponding various three-dimensional model files; For each processing module, comprise read module and modular converter, after read module reads file, convert the file of consolidation form to through modular converter;
Each processing module adopts unified interface;
4) to being converted to file, extract essential characteristic, and deposit the essential characteristic table of the file of consolidation form in;
5) finally obtain the file of described consolidation form.
The file of described consolidation form is the sta file, and described processing module is the sta system;
Comprise the essential characteristic table in the sta file, the sta system just extracts the essential characteristic data of three-dimensional model in transfer process, leaves in the essential characteristic table; Search engine is selected to adopt this characteristic table, or extracts other features based on the sta file;
Original three dimensional file is converted to the sta file, can lose a large amount of details after the conversion, but has kept the principal character of three-dimensional model, and this principal character comprises structure of models, Module Division, profile;
The sta system file reads and conversion portion adopts unified interface, when compatible new three dimensional file form needing to occur, only needs read with conversion portion at file and adds corresponding expansion module; As long as the new modular converter that adds meets the sta system interface, system can support new three dimensional file form immediately;
The form of sta file is observed the standard of formulating among the W3C.
In the described step 3), parameter is big more, and the image feature data loss is many more, and the sta file volume after the conversion is more little;
Here this parameter is called conversion than parameter, between the value 1 to 100.When conversion was 1 than value, the sta file after the conversion kept nearly all details of source document, has just carried out format conversion, it is maximum that sta file volume reaches, the characteristic distortion minimum that extract this moment can be extracted the nearly all feature of original image, as framework characteristic, geometric properties etc.; Value is 100 o'clock, and it is maximum that the amount of detail minimum that the sta file keeps, slewing distortion reach, and it is minimum that the corresponding document volume also reaches, and it is maximum that the characteristic distortion of extracting this moment also reaches, and can only extract basic characteristic, as statistical nature etc.
In the described step 3), when occur needing compatible new three dimensional file form, add corresponding read module/modular converter in the processing module, and read module/modular converter is set meets the sta system interface, can support new three dimensional file format conversion.
In the described step 4), when extracting feature, adopt unified interface interchange feature extraction algorithm module; When optimized Algorithm more, then follow system interface and add new algoritic module, can use new feature extraction algorithm immediately.
Three-dimensional feature extraction algorithm commonly used now has the PCA algorithm, and the PCA algorithm carries out standardization to the three-dimensional model coordinate, calculates its standardized coordinate frame, extracts corresponding feature then in this normalized coordinates system.The parameter type that extracts has statistical nature, framework characteristic, geometric features etc. usually.
In the described step 3), processing module comprises stl read module/stl modular converter, ply read module/ply modular converter, vrml read module/vrml modular converter or alternative document read module/alternative document modular converter.
Wherein, read module is opened corresponding document according to file layout, extracts graph data, is made up of some triangles as the stl file, and then the stl read module extracts all triangles in the file, sends into modular converter then.Modular converter is recombinated to the graph data that extracts and is changed, as stl file conversion module all triangles that extraction module extracts are spliced and cut apart, whole figure is reclassified as the graphic element of some sta files, saves as the sta file at last.
A kind of based on the above-mentioned three-dimensional search engine that is applicable to the three dimensional file format conversion method of internet hunt, step comprises:
1) sets up index, obtain comprising the database of the form index file of characteristic and corresponding uniform formatted file based on the consolidation form file;
2) submit key word of the inquiry or query characteristics to;
3) key word or the query characteristics of submitting to according to the user extracted the characteristic for search;
4) key word of comparison user submission or the comparison of the characteristic in query characteristics and the described database obtain Query Result.
In the described step 1), adopt said method to carry out format conversion, obtain the form index file of consolidation form file; On the form index file basis of consolidation form file, extract characteristic based on index file, deposit the characteristic extracted and the form index file of consolidation form file in database together then.
Described consolidation form file is the sta file.
Description of drawings
Fig. 1 is an internet search engine workflow synoptic diagram in the prior art;
Fig. 2 is based on the index of sta and sets up schematic flow sheet;
Fig. 3 is a sta system framework synoptic diagram;
Fig. 4 is based on the three-dimensional search engine framework synoptic diagram of sta.
Embodiment
Below in conjunction with accompanying drawing and embodiment the technical program is described further.
1 proposes the three-dimensional search new architecture
1.1 three-dimensional search engine structure
The flow process of internet search engine can comprise usually: gather information, organize your messages, acceptance inquiry, user input query condition, searching database, present Search Results (as Fig. 1) at browser.
1.2 the developing problem of three-dimensional search engine
The invention of this paper will directly influence organize your messages and present two steps of result.
The process of search engine organize your messages is called " setting up index ".Search engine not only will be preserved and collect the information of getting up, and also they will be carried out layout according to certain rule.Like this, search engine just need not to thumb the information of its all preservation again and can find desired data rapidly.For picture or text message, index set up in the most text based keyword of search engine, as the summary info of picture, filename, content of text etc.And the quantity of information that three-dimensional model file carries is very big, and be not with text marking in most three-dimensional model file contents, therefore be difficult to extract text as keyword index, and only extract keyword from filename or summary info, the bulk information that carries in the three-dimensional model can't well be described, for search brings difficulty.Therefore, the focus of current people's research concentrates on and extract eigenwert from three-dimensional model, and retrieves based on the three-dimensional feature value.Yet, make present feature extraction algorithm become practical application from research, must overcome following problem:
1 extracts quite difficulty of unified characteristic from present diversified three dimensional file.
2 three-dimensional modeling data amounts are very big usually, so the calculated amount of analyzing and processing is very big, and it also is that a difficult problem to be solved is arranged that leaching process need consume the plenty of time.
The result of search engine presents, and promptly interactive interface is extremely important, and the user is indifferent to engine and how searches for when using search engine, but sees whether interactive interface is convenient to input when operation, whether result displayed is accurate, and whether the result comes into plain view.To the search of picture or text, the result can present to the user with preview picture, literal preview intuitively.Then can run into following problem for three-dimensional data:
1 data volume is compared with picture or text message, exceed some orders of magnitude, in for example Automobile Design industry, a whole vehicle model file size is near 1GB, and the car mould file of a two dimension has only tens of KB, after internet search engine obtains Search Results and arrives,, can not realize under bandwidth and the processor condition at present if will carry out the previews simultaneously of some source documents at browser.
2 three dimensional file forms are various, allow browser support that simultaneously the three dimensional file difficulty of so multiple form is very big.
Even 3 browsers have been supported present various three dimensional file forms, if new three-dimensional data form, expansion is also inconvenient.
1.3 propose the 3 dimensional format converting system
This paper invention three dimensional file format conversion system is for a difficult problem that solves in 1.2 has proposed scheme for reference.Native system is supported the three dimensional file of multiple form, and converts the index file of consolidation form to.Here temporarily this three dimensional file format conversion system is called the sta system, the unified file format that obtains after the conversion is called the sta form.
This paper proposes the new three-dimensional search exchange architecture based on this converting system simultaneously, promptly based on the unitized search engine of file layout.This search engine is when setting up index, call the sta system earlier and carry out format conversion, the three-dimensional modeling data unification of collecting is converted to the file of sta form, on the sta file basis, extracts characteristic, then the characteristic and the sta file that extract are put in storage together.Use the index of the search engine of sta system and set up flow process such as Fig. 2:
2 three-dimensional model file layout converting systems
2.1sta system framework
Sta system framework such as Fig. 3.
After the sta system receives the three-dimensional model file, will judge file layout, then according to the corresponding processing module of file layout different choice.And parameter can be provided with the sta file volume that the parameter control transformation obtains and the ratio of source document flexibly during conversion.The sta system adopts unified each processing module of interface interchange, is easy to expansion.After the conversion, sta system call feature extraction algorithm module, the essential characteristic of extraction model also exists in the essential characteristic table of sta file.
2.2sta system performance
The concrete following monopolizing characteristic of sta system:
1 supports various three dimensional file forms
Support various sphere of learning three-dimensional model file layouts, as stl, x3d, vrml etc.; Support automobile, aviation industry file layout such as catia, UG etc.; Machinery industry file layout such as solidworks, pro/E etc.; Finite element industry such as hypermesh, DYNA etc.; Building trade such as AutoCAD, PKPM etc.
2 essential characteristic tables
Comprise the essential characteristic table in the sta file, the sta system just extracts the essential characteristic data of three-dimensional model in transfer process, leave in the essential characteristic table.Search engine system can be based on this essential characteristic table characteristic information extraction warehouse-in.But owing to be in the sta system, to handle, there is limitation, may do not have the user's interest characteristic in the table.Therefore search engine can select to adopt this characteristic table, or extracts other features based on the sta file.
3 keep principal character, abandon details
Original three dimensional file is converted to the sta formatted file, can lose a large amount of details after the conversion, but has kept the principal character of three-dimensional model, as structure of models, Module Division, profile etc.Be similar to the generation thumbnail.
4 parameters are adjustable
Details during conversion abandons degree as parameter, can be provided with flexibly according to applicable cases.Parameter is big more, and the view data loss is many more, and the sta file volume after the conversion is more little.
5 can expand the new three dimensional file form of support
The sta system file reads with conversion portion and adopts unified interface, when occur needing compatible new three dimensional file form, only need read with conversion portion at file and add corresponding expansion module, as long as the new module that adds meets the sta system interface, system can support new three dimensional file form immediately.
6 can expand the new feature extraction algorithm of support
The sta system can carry out feature extraction in transfer process, and deposits the characteristic of extracting in the essential characteristic table, and the sta system adopts unified interface interchange feature extraction algorithm module.When optimized Algorithm more, only need follow system interface and add new algoritic module, can use new feature extraction algorithm immediately.
The standardization of 7 file layouts
The sta file layout is observed the standard of formulating among the W3C, is more convenient for the browser support.
2.3sta the advantage that system brings
The three-dimensional search engine of having used the sta system is with concrete following advantage
1 unified file format makes the feature extraction algorithm widespread use
Carry out feature extraction based on unified sta form, make that the various feature extractions and the similarity matching algorithm of research are able to widespread use at present, no longer be subjected to the treatment limits that the file layout diversity is brought.
2 significantly reduce calculated amount
The sta formatted file is given up a large amount of details of original three-dimensional data, keeps its principal character data.Therefore, the sta file still can extract more complete characteristic.But because sta has given up a large amount of detail data, data volume is compared with source document and is reduced some orders of magnitude.Simplifying of file size will directly reduce the calculated amount of analyzing and processing, improve the efficient that feature extraction is handled, and save resource.
3 abundant presentation modes as a result
Because uniform format and deferred to the W3C standard, browser only need be supported the demonstration of sta formatted file, can allow user's vision preview three-dimensional model, if new three-dimensional model form occurs, only need to expand in the sta system support to format, browser end then need not upgrade.
Because the file volume is little, the Network Transmission occupied bandwidth is little, makes that several three dimensional file of preview simultaneously become possibility on browser under the present network condition.
Though sta has caused losing of data, in the practical application, the user only need see on the whole that it is its target data of wanting that complete three-dimensional model just can judge whether under the situation mostly.This thought that presents in the thumbnail mode during also with picture searching is similar.
3 three-dimensional search engines based on sta
Used three-dimensional search engine framework figure such as Fig. 4 of sta:
1 system advantage:
1) carries out feature extraction again after being converted to unified sta file,, reduced the processing load of characteristic extracting module for the processing again of search engine has brought convenience.
2) the sta file layout is unified, volume is little, defer to the W3C standard.Browser only need be supported the demonstration of sta formatted file, can vision present a plurality of three-dimensional models on browser, experiences giving the brand-new three-dimensional of user.
2 system defects:
1) the index establishment stage of search engine after gathering information must be handled three-dimensional data earlier, obtain just putting in storage behind the sta file, so the index establishment stage can be more consuming time.
2) the sta file has been given up the great amount of images details for reduced volume.Though attempt to keep as far as possible the primitive character of view data, it is inevitably that the loss of data causes the distortion of characteristic, brings influence therefore can for the accuracy of result queries.
Therefore 3) the sta file does not comprise the image partial data, is current in the result, can't detailed image presents for the user provides more.If the user wishes to see more complete three-dimensional model image, need provide other improvement or compensation scheme.
Claims (8)
1. three dimensional file format conversion method that is applicable to internet hunt is characterized in that step comprises:
1) receives the three-dimensional model file;
2) judge the three-dimensional model file layout, change according to the corresponding processing module of file layout different choice;
3) corresponding file is sent into the alignment processing module and is handled; Carry out parameter setting simultaneously, the details the during file of this parameter control transformation consolidation form abandons degree;
Described processing module has multiple, respectively corresponding various three-dimensional model files; For each processing module, comprise read module and modular converter, after read module reads file, convert the file of consolidation form to through modular converter;
Each processing module adopts unified interface;
4) to being converted to file, extract essential characteristic, and deposit the essential characteristic table of the file of consolidation form in;
5) finally obtain the file of described consolidation form.
2. the three dimensional file format conversion method that is applicable to internet hunt according to claim 1, the file that it is characterized in that described consolidation form is the sta file, described processing module is the sta system;
Comprise the essential characteristic table in the sta file, the sta system just extracts the essential characteristic data of three-dimensional model in transfer process, leaves in the essential characteristic table; Search engine is selected to adopt this characteristic table, or extracts other features based on the sta file;
Original three dimensional file is converted to the sta file, can lose a large amount of details after the conversion, but has kept the principal character of three-dimensional model, and this principal character comprises structure of models, Module Division, profile;
The sta system file reads and conversion portion adopts unified interface, when compatible new three dimensional file form needing to occur, only needs read with conversion portion at file and adds corresponding expansion module; As long as the new modular converter that adds meets the sta system interface, system can support new three dimensional file form immediately;
The form of sta file is observed the standard of formulating among the W3C.
3. the three dimensional file format conversion method that is applicable to internet hunt according to claim 2 is characterized in that in the described step 3), parameter is big more, and the image feature data loss is many more, and the sta file volume after the conversion is more little.
4. the three dimensional file format conversion method that is applicable to internet hunt according to claim 2, it is characterized in that in the described step 3), when occur needing compatible new three dimensional file form, add corresponding read module/modular converter in the processing module, and read module/modular converter is set meets the sta system interface, can support new three dimensional file format conversion.
5. the three dimensional file format conversion method that is applicable to internet hunt according to claim 1 and 2 is characterized in that in the described step 4), when extracting feature, adopts unified interface interchange feature extraction algorithm module; When optimized Algorithm more, then follow system interface and add new algoritic module, can use new feature extraction algorithm immediately.
6. the three dimensional file format conversion method that is applicable to internet hunt according to claim 1 and 2, it is characterized in that in the described step 3) that processing module comprises stl read module/stl modular converter, ply read module/ply modular converter, vrml read module/vrml modular converter or alternative document read module/alternative document modular converter.
7. one kind based on the arbitrary described three-dimensional search engine that is applicable to the three dimensional file format conversion method of internet hunt of claim 1～6, it is characterized in that step comprises:
1) sets up index, obtain comprising the database of the form index file of characteristic and corresponding uniform formatted file based on the consolidation form file;
2) submit key word of the inquiry or query characteristics to;
3) key word or the query characteristics of submitting to according to the user extracted the characteristic for search;
4) key word of comparison user submission or the comparison of the characteristic in query characteristics and the described database obtain Query Result.
In the described step 1), adopting claim 1) described method carries out format conversion, obtains the form index file of consolidation form file; On the form index file basis of consolidation form file, extract characteristic based on index file, deposit the characteristic extracted and the form index file of consolidation form file in database together then.
8. the three-dimensional search engine that is applicable to internet hunt according to claim 7 is characterized in that described consolidation form file is the sta file.
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Application publication date: 20110518 |