CN107506489A - A kind of method that Large Copacity JPG pictures are checked in Android and apple system - Google Patents

A kind of method that Large Copacity JPG pictures are checked in Android and apple system Download PDF

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Publication number
CN107506489A
CN107506489A CN201710862513.7A CN201710862513A CN107506489A CN 107506489 A CN107506489 A CN 107506489A CN 201710862513 A CN201710862513 A CN 201710862513A CN 107506489 A CN107506489 A CN 107506489A
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jpg
photo current
android
large copacity
grade
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CN107506489B (en
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陈欣
农树海
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Zhongke Huachen Innovation Technology R & D Center Co ltd
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Guangxi Lingtu Mdt Infotech Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/29—Geographical information databases
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/95—Retrieval from the web
    • G06F16/957—Browsing optimisation, e.g. caching or content distillation
    • G06F16/9574—Browsing optimisation, e.g. caching or content distillation of access to content, e.g. by caching

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  • Engineering & Computer Science (AREA)
  • Databases & Information Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Data Mining & Analysis (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Processing Or Creating Images (AREA)

Abstract

The invention discloses a kind of method that Large Copacity JPG pictures are checked on Android system, and it is applied to Surveying and Mapping Industry field.The key step of this method includes：（1）The graduation of individual Large Copacity JPG pictures is cut into slices and classified and is named storage；（2）The small picture named is packaged as tpk files；（3）Tpk files are browsed using the ArcGIS for Android/iOS sdk provided.The present invention by by the classification of Large Copacity JPG pictures not Qie Pian after be packaged as the offline map files of tpk forms, loaded in APP using the offline map file of this tpk form as section base map, can solve the problems, such as that Large Copacity JPG pictures can not be browsed in Android system and iPhone system, meet that the mobile phone of Modern Surveying ＆ Mapping industry mobile office checks the demand of Large Copacity high resolution image figure.

Description

A kind of method that Large Copacity JPG pictures are checked in Android and apple system
Technical field
It is more particularly to a kind of to check that Large Copacity JPG schemes in Android and apple system the present invention relates to Surveying and Mapping Industry field The method of piece.
Background technology
The technological progress of present camera lens of taking photo by plane, the resolution ratio more and more higher of camera lens, our aircraft, unmanned plane can be shot The other high-resolution aerophotograph of 0.3 meter level, it is other that China's satellite photo has also reached sub-meter grade, these high-resolution aerophotographs, defends piece all It is the Large Copacity JPG pictures that 1G mono- opens the above, can not be browsed on mobile phone, is checked on computers also very slow.And now Villages and small towns map in the map of one town of national mono- villages of Zuo one is also the picture of Large Copacity（JPG forms）, it is good thing that precision, which has uprised, But bring be browse efficiency reduction, general computer Pan and Zoom picture very interim card, mobile phone can not browse.It is mutual now Networking epoch, mobile office increasingly become the active demand on territory, Surveying and Mapping Industry, and the field process of many Surveying and Mapping Industries has Check the needs of high resolution image on mobile phone, such as the recent rural holding power of management is really weighed, the place name of the civil affairs department Location generaI investigation, national third time land investigation etc.；Also there is a demand of this respect in military aspect, such as by the newest of unmanned plane shooting Aerophotograph is imported in tablet personal computer, moves operational deployment, deployment of forces, sand table rehearsal etc..Computer browses Large Copacity drawing card , the reason for mobile phone can not open Large Copacity drawing is exactly that drawing is too big, occupies substantial amounts of running memory, 1G's Occupancy 3G or so running memory is needed exemplified by JPG files, after opening, general mobile phone is without so high idle running memory , it can not browse substantially, desktop computer browses also gruelling.
The content of the invention
Instant invention overcomes the deficiencies in the prior art, and now this Large Copacity JPG pictures are cut into multiple small pictures, packing For the offline map bag of tpk forms, in ArcGIS for Android/iOS using the offline map file of this tpk form as Tile type section base map is loaded, due to system itself when ArcGIS for Android/iOS load tile type section base map It has been optimized that, no matter whole tpk has much, display efficiency is not affected, because ArcGIS for Android/iOS meetings Automatic only load needs the small picture of viewing area and buffer area the internal memory very little of occupancy, to be browsed into internal memory so as to improve Efficiency, solves the problems, such as the picture that mobile phone can not browse Large Copacity.
The present invention realizes above-mentioned purpose using following technical scheme：
A kind of method that Large Copacity JPG pictures are checked in Android and apple system, this method step include：
Step 1, the graduation of individual Large Copacity JPG pictures, which is cut into slices and classified, is named storage；
Step 2, the small picture named is packaged as tpk files；
Step 3, using ArcGIS for Android/iOS provide sdk browse tpk files.
Described a kind of side that Large Copacity JPG pictures are checked in Android and apple system to better implement the present invention Method, the step 1 comprise the following steps：
Step 1.1, the figure that the Large Copacity JPG pictures checked in Android or apple system will be needed to change into 96 DPI resolution ratio Piece；
Step 1.2, the pixel value for determining photo current is obtained, photo current grade, photo current grade are judged by pixel value Span be 1 to 20, when pixel value is less than (512*256) photo grade be 1, when pixel value exists（512*256) arrive (4* Photo grade is 2 when between 512*256), when pixel value arrives (4 at (4*512*256)2* 512*256) when photo grade be 3, with This analogizes the value that photo current grade is judged by pixel value；
Step 1.3, figure need not be cut if photo current grade is 1, picture is not belonging to large image, can be directly clear Look at, all steps terminate；Capacity is excessive if photo current grade is more than 20, it is impossible to handles, all steps terminate；If work as Preceding photo grade proceeds to step 1.4 more than or equal to 2；
Step 1.4, in photo current designated centers point Pc（xc, yc）, subscriptcRepresent central point, xcRepresent center point PcX-axis sit Mark, ycRepresent center point PcY-axis coordinate, and specify the point corresponding to real world longitude lon and latitude lat, longitude lon Span is -180 ° to 180 °, and latitude lat span is -90 ° to 90 °；If without the longitude lon of real world With latitude lat, longitude lon and latitude lat can be arbitrarily specified in span；Pass through formula xc=（512* photo currents etc. Level）*（lon+180°）With formula yc=（256* photo current grades）*（90°-lat）Obtain center point Pc（xc, yc）Value；
Step 1.5, use center point Pc（xc, yc）X-axis coordinate xcValue divided by 256, rounds to obtain Zx, takes the remainder to obtain YUx, integer Zx Abscissa the numbering Bx, x of section where current pointcRemainder YUx remainders are subtracted to obtain cutting figure starting point Pst（xst, yst）In xstValue, i.e. xst=xc- YUx, subscriptstRepresent starting point；Use center point Pc（xc, yc）Y-axis coordinate ycValue divided by 256, is rounded Zy, takes the remainder to obtain YUy, and integer Zy is abscissa the numbering By, y of section where current pointcRemainder YUy remainders are subtracted to obtain cutting figure Starting point Pst（xst, yst）In xstValue, i.e. yst=yc-YUy；
Step 1.6, on photo current with point Pst（xst, yst）As starting point, press respectively every 256 × 256 to the right and downwards Pixel size is that step-length carries out sectional drawing and saves as the section of .jpg forms, does not stop sectional drawing until the edge of photo current, if Arrived inadequate 256 × 256 pixel of edge size of photo current, then with the pixel of blank polishing 256 × 256, the section text cut Part name is named by the incremental mode of slice number transverse and longitudinal, i.e., first section name is " Bx, By.jpg ", incrementally Nr is walked when to the right After long downward incrementally Nd progress sectional drawings, gained section is that name is " Bx+Nr, By+Nd.jpg "；With P on photo currentst （xst, yst）For point as starting point, it is that step-length carries out sectional drawing and preserved to press to the left and upwards respectively every 256 × 256 pixel sizes For the section of .jpg forms, sectional drawing is not stopped until the edge of photo current, if having arrived the edge size inadequate 256 of photo current × 256 pixels, then with the pixel of blank polishing 256 × 256, the section filename cut is ordered in the way of slice number transverse and longitudinal is successively decreased , i.e., first section name is " Bx, By.jpg ", after Nl step-lengths incrementally Nu progress sectional drawing upwards is incremented by the left, gained is cut Piece is that name is " Bx-Nr, By-Nd.jpg "；
Step 1.7, the section collection switched in step 1.6 is saved in same file folder, file is named as photo current etc. Level；
If step 1.8, photo current grade are equal to 2, step 1 terminates；If photo current grade is more than 2 by photo current The a quarter of current size is narrowed down to, photo current grade subtracts 1, then jumps to step 1.4, repeats to cut figure.
Described a kind of side that Large Copacity JPG pictures are checked in Android and apple system to better implement the present invention Method, the step 2 comprise the following steps：
Step 2.1, by the small picture named in each file as different files be packaged as this document folder corresponding to bundle File, obtain a series of bundle file sets；
Step 2.2, by packed bundle file sets, corresponding figure layer range information and map grade and resolution information Tpk files are packaged as by arcgis requirement.
Described a kind of side that Large Copacity JPG pictures are checked in Android and apple system to better implement the present invention Method, the step 3 comprise the following steps：
A mobile applications are established in step 3.1, Android system, are loaded in the program frame of mobile applications The sdk that ArcGIS for Android/iOS are provided；
Step 3.2, tpk files are loaded in mobile applications, by calling loaded ArcGIS for Android/ The sdk that iOS is provided browses Large Copacity JPG pictures corresponding to tpk files.
The present invention compared with prior art, has advantages below and beneficial effect:
（1）Browse Large Copacity JPG pictures not interim card, be not take up substantial amounts of running memory；
（2）We browse the advantages of tile map tpk bags are fast using ArcGIS for Android/iOS, by common Large Copacity Into tpk bags, the sdk for directly invoking ArcGIS for Android/iOS offers is browsed picture making, it is not necessary to is made special The picture browsing engine of door, evade and make the wind that the huge workload and performance that special picture browsing engine is brought can not be lifted Danger.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method.
Embodiment
Below by embodiment, the invention will be further described, so that advantages and features of the invention are easier to be managed Solution, but protection scope of the present invention is not limited to these embodiments.
Embodiment
A kind of method that Large Copacity JPG pictures are checked in Android and apple system of the present invention, with reference to Fig. 1 institutes Show, this method comprises the following steps:
1）The Large Copacity JPG pictures A for needing to check in Android or apple system is changed into the picture B of 96 DPI resolution ratioD, under MarkDRepresent photo grade；
2）Obtain and determine photo current BDPixel value P, by P value judge photo current grade D, D span be 1 to 20, as 0 ＜ P≤(512*256), D values are 1, and as (512*256) ＜ P≤4* (512*256), D values are 2, as 4* (512* 256) ＜ P≤42* D values are 3 when (512*256), pass through 4 by that analogyD-2* (512*256) ＜ P≤4 D-1* (512*256) judges Photo current grade D value；
3）Figure need not be cut if D=1, picture A is not belonging to large image, can directly browse, and all steps terminate；Such as Then capacity is excessive by fruit D ＞ 20, it is impossible to handles, all steps terminate；Proceed to step 4 if D >=2）；
4）In picture BDDesignated centers point Pc（xc, yc）, subscriptcRepresent central point, xcRepresent center point PcX-axis coordinate, ycTable Show center point PcY-axis coordinate, and specify the point corresponding to real world longitude lon and latitude lat, longitude lon value models It is -180 ° to 180 ° to enclose, and latitude lat span is -90 ° to 90 °；If without the longitude lon and latitude of real world Lat, longitude lon and latitude lat can be arbitrarily specified in span；Pass through formula xc=（512*D）*（lon+180°）With Formula yc=（256*D）*（90°-lat）Obtain center point Pc（xc, yc）Value；
5）Use center point Pc（xc, yc）X-axis coordinate xCValue divided by 256, rounds to obtain Zx, takes the remainder to obtain YUx, integer Zx is current The abscissa numbering Bx, x of section where pointcRemainder YUx remainders are subtracted to obtain cutting figure starting point Pst（xst, yst）In xstValue, i.e., xst=xc- YUx, subscriptstRepresent starting point；Use center point Pc（xc, yc）Y-axis coordinate ycValue divided by 256, rounds to obtain Zy, remainder It is several that YUy, integer Zy are abscissa the numbering By, y of section where current pointcRemainder YUy remainders are subtracted to obtain cutting figure starting point Pst（xst, yst）In xstValue, i.e. yst=yc-YUy；
6）In picture BDOn with point Pst（xst, yst）As starting point, press respectively every 256 × 256 pixel sizes to the right and downwards Sectional drawing is carried out for step-length and saves as the section of .jpg forms, does not stop sectional drawing until picture BDEdge, if having arrived picture BD's Inadequate 256 × 256 pixel of edge size, then with the pixel of blank polishing 256 × 256, the section filename cut is by slice number The incremental mode of transverse and longitudinal is named, i.e., first section name is " Bx, By.jpg ", incrementally Nd enters downwards when being incremented by Nr step-lengths to the right After row sectional drawing, gained section is that name is " Bx+Nr, By+Nd.jpg "；In picture BDOn with Pst（xst, yst）Point is as starting Point, press to the left and upwards respectively and carry out sectional drawing for step-length every 256 × 256 pixel sizes and save as the section of .jpg forms, Sectional drawing is not stopped until picture BDEdge, if having arrived picture BDInadequate 256 × 256 pixel of edge size, then with blank polishing 256 × 256 pixels, the section filename cut are named in the way of slice number transverse and longitudinal is successively decreased, i.e., first section name is " Bx, By.jpg ", after Nl step-lengths incrementally Nu progress sectional drawing upwards is incremented by the left, gained section is that name is " Bx-Nr, By- Nd.jpg”；
7）By step 6）In the section collection that switches to be saved in same file folder, file is named as present level, i.e. file Entitled " D "；
8）If current D is equal to 2, step 9 is jumped to）；If D ＞ 2 will scheme BDThe a quarter of current size is narrowed down to, D is certainly Oneself subtracts 1, i.e. D=D-1, obtains the figure B of next gradeD, then jump to step 4）, repeat to cut figure；
9）The small picture named in each file is packaged as to the corresponding bundle of this document folder file by different files, obtained To a series of bundle file sets { a1, a2, a3... ... Pn}；
10）By packed bundle file sets { a1, a2, a3... ... Pn, corresponding figure layer range information and map grade With resolution information tpk files T is packaged as by arcgis requirement；
11）A mobile applications App is established in Android system, is loaded in mobile applications App program frame The sdk that ArcGIS for Android/iOS are provided；
12）Tpk file T are loaded in mobile applications App, by calling loaded ArcGIS for Android/iOS The sdk of offer browses Large Copacity JPG pictures A corresponding to tpk files T.

Claims (4)

  1. A kind of 1. method that Large Copacity JPG pictures are checked in Android and apple system, it is characterised in that：This method step bag Include：
    Step 1, the graduation of individual Large Copacity JPG pictures, which is cut into slices and classified, is named storage；
    Step 2, the small picture named is packaged as tpk files；
    Step 3, using ArcGIS for Android/iOS provide sdk browse tpk files.
  2. 2. a kind of method that Large Copacity JPG pictures are checked in Android and apple system according to claim 1, its feature It is：The step 1 comprises the following steps：
    Step 1.1, the figure that the Large Copacity JPG pictures checked in Android or apple system will be needed to change into 96 DPI resolution ratio Piece；
    Step 1.2, the pixel value for determining photo current is obtained, photo current grade, photo current grade are judged by pixel value Span be 1 to 20, when pixel value is less than (512*256) photo grade be 1, when pixel value exists（512*256) arrive (4* Photo grade is 2 when between 512*256), when pixel value arrives (4 at (4*512*256)2* 512*256) when photo grade be 3, with This analogizes the value that photo current grade is judged by pixel value；
    Step 1.3, figure need not be cut if photo current grade is 1, picture is not belonging to large image, can be directly clear Look at, all steps terminate；Capacity is excessive if photo current grade is more than 20, it is impossible to handles, all steps terminate；If work as Preceding photo grade proceeds to step 1.4 more than or equal to 2；
    Step 1.4, in photo current designated centers point Pc（xc, yc）, subscriptcRepresent central point, xcRepresent center point PcX-axis sit Mark, ycRepresent center point PcY-axis coordinate, and specify the point corresponding to real world longitude lon and latitude lat, longitude lon Span is -180 ° to 180 °, and latitude lat span is -90 ° to 90 °；If without the longitude lon of real world With latitude lat, longitude lon and latitude lat can be arbitrarily specified in span；Pass through formula xc=（512* photo currents etc. Level）*（lon+180°）With formula yc=（256* photo current grades）*（90°-lat）Obtain center point Pc（xc, yc）Value；
    Step 1.5, use center point Pc（xc, yc）X-axis coordinate xcValue divided by 256, rounds to obtain Zx, takes the remainder to obtain YUx, integer Zx is Abscissa the numbering Bx, x of section where current pointcRemainder YUx remainders are subtracted to obtain cutting figure starting point Pst（xst, yst）In xst Value, i.e. xst= xc- YUx, subscriptstRepresent starting point；Use center point Pc（xc, yc）Y-axis coordinate ycValue divided by 256, is rounded Zy, takes the remainder to obtain YUy, and integer Zy is abscissa the numbering By, y of section where current pointcRemainder YUy remainders are subtracted to obtain cutting figure Starting point Pst（xst, yst）In xstValue, i.e. yst=yc-YUy；
    Step 1.6, on photo current with point Pst（xst, yst）As starting point, press respectively every 256 × 256 to the right and downwards Pixel size is that step-length carries out sectional drawing and saves as the section of .jpg forms, does not stop sectional drawing until the edge of photo current, if Arrived inadequate 256 × 256 pixel of edge size of photo current, then with the pixel of blank polishing 256 × 256, the section text cut Part name is named by the incremental mode of slice number transverse and longitudinal, i.e., first section name is " Bx, By.jpg ", incrementally Nr is walked when to the right After long downward incrementally Nd progress sectional drawings, gained section is that name is " Bx+Nr, By+Nd.jpg "；With P on photo currentst （xst, yst）For point as starting point, it is that step-length carries out sectional drawing and preserved to press to the left and upwards respectively every 256 × 256 pixel sizes For the section of .jpg forms, sectional drawing is not stopped until the edge of photo current, if having arrived the edge size inadequate 256 of photo current × 256 pixels, then with the pixel of blank polishing 256 × 256, the section filename cut is ordered in the way of slice number transverse and longitudinal is successively decreased , i.e., first section name is " Bx, By.jpg ", after Nl step-lengths incrementally Nu progress sectional drawing upwards is incremented by the left, gained is cut Piece is that name is " Bx-Nr, By-Nd.jpg "；
    Step 1.7, the section collection switched in step 1.6 is saved in same file folder, file is named as photo current etc. Level；
    If step 1.8, photo current grade are equal to 2, step 1 terminates；If photo current grade is more than 2 by photo current The a quarter of current size is narrowed down to, photo current grade subtracts 1, then jumps to step 1.4, repeats to cut figure.
  3. 3. a kind of method that Large Copacity JPG pictures are checked in Android and apple system according to claim 1, its feature It is：The step 2 comprises the following steps：
    Step 2.1, by the small picture named in each file as different files be packaged as this document folder corresponding to bundle File, obtain a series of bundle file sets；
    Step 2.2, by packed bundle file sets, corresponding figure layer range information and map grade and resolution information Tpk files are packaged as by arcgis requirement.
  4. 4. a kind of method that Large Copacity JPG pictures are checked in Android and apple system according to claim 1, its feature It is：The step 3 comprises the following steps：
    A mobile applications are established in step 3.1, Android system, are loaded in the program frame of mobile applications The sdk that ArcGIS for Android/iOS are provided；
    Step 3.2, tpk files are loaded in mobile applications, by calling loaded ArcGIS for Android/ The sdk that iOS is provided browses Large Copacity JPG pictures corresponding to tpk files.
CN201710862513.7A 2017-09-22 2017-09-22 Method for checking large-capacity JPG (Java native page) pictures on android and apple systems Active CN107506489B (en)

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