CN108898644A - A kind of raster data dynamic rendering method, system and storage medium - Google Patents
A kind of raster data dynamic rendering method, system and storage medium Download PDFInfo
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- CN108898644A CN108898644A CN201810654233.1A CN201810654233A CN108898644A CN 108898644 A CN108898644 A CN 108898644A CN 201810654233 A CN201810654233 A CN 201810654233A CN 108898644 A CN108898644 A CN 108898644A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/001—Texturing; Colouring; Generation of texture or colour
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Abstract
The present invention relates to internets and multimedia technology field.In particular to the method, apparatus and computer readable storage medium of a kind of dynamic rendering raster data.In the embodiment of a method based on Webgl dynamic rendering raster data, including setting rendering parameter, the rendering parameter include rendering upper limit max, rendering lower limit min and take color table；The value of the rendering factor factor of each pixel is calculated, factor=(value-min)/(max-min), wherein value is the value of each pixel；And the corresponding color of color table is being taken according to each pixel rendering factor factor value, dynamic rendering is carried out to geodata using Webgl.The invention enables data handling procedures to be located at browser, does not consume server resource, reduces the requirement to server computational power, and after only needing first time request data and being cached to browser end, after browser end adjustment parameter, without request data again, different rendering effects can be realized.
Description
Technical field
The present invention relates to a kind of raster data dynamic rendering methods, render in particular to a kind of raster data dynamic
Method, apparatus and computer readable storage medium.
Background technique
The present invention to the description of background technique belong to the relevant technologies of the invention, be only used for illustrating and be easy to understand
Summary of the invention of the invention, should not be construed as applicant be specifically identified to or estimate applicant be considered the present invention be put forward for the first time Shen
The prior art of the applying date please.
Since Web occur since, computer picture is just wherein play an important role, it may be said that be exactly by
In the appearance of the multimedia elements such as various images and audio visual, greatly attract people's note that creating
The prosperity of internet today.The image used on Web can be divided into grating image and two kinds of vector image.It is most at present
Web graph picture be grating image, such as：GIF, JPEG and PNG etc..
Space is exactly divided into regular grid by raster data, each grid is known as a unit, and in each list
A kind of data mode that corresponding attribute value carrys out presentation-entity is assigned in member.Grating image is to describe image with bitmap dot matrix
, this method has some limitations：Firstly, grating image must include the information of each point to show the image, because
Image file is all bigger and be unfavorable for network transmission under normal conditions for this.Secondly, grating image does not have " intelligence ", they
The information that can be searched itself " can not be carried ".In addition, grating image can not carry out direct editing, data can not be or else lost
In the case where carry out stretching, to influence its resolution ratio and color.The characteristics of grating image make it can not with user into
Interaction, the information content for including are seldom well for row.It is extremely limited for expressive ability of the complicated map on Web.
Raster data dynamic rendering refers to can be such that identical raster data source shows not by operating side adjustment parameter
Same rendering effect.Existing common raster data dynamic rendering method has two kinds of the end Pc and the end Web.The end Pc mainly passes through
Professional software handles local data.The end Web is mainly calculated by server-side and passes through network transmission and rendered to browser.
Since the image of remote sensing system acquisition is often grating image, the characteristics of due to grating image itself, and for ground
The rendering problem of information image is managed, the end Pc needs to render raster data using professional software, and complicated for operation, it is inconvenient to show；Web
There are data transmission bauds to be limited for end dynamic rendering, and all server-side is needed to recalculate, and transmit again after adjustment parameter every time
It is slower to be limited to network transfer speeds rendering speed after each adjustment parameter for data.
Summary of the invention
For the defect for solving the above-mentioned prior art, the embodiment of the present invention provides a kind of raster data dynamic rendering method, dress
It sets and computer readable storage medium.
For this purpose, one embodiment of the invention provides a kind of raster data dynamic rendering method, including：Setting rendering ginseng
Number, the rendering parameter include rendering upper limit value max, rendering lower limit value min and take color table；For each pixel calculate rendering because
The value of sub- factor, factor=(value-min)/(max-min), wherein value is the value of each pixel；And according to
The rendering factor factor value of each pixel is taking the corresponding color of color table, carries out dynamic rendering to geodata using Webgl.
Preferably, the raster data dynamic rendering method further includes：Whether detection geodata caches, if do not delayed
It deposits, then requests geodata.
Preferably, in the raster data dynamic rendering method, dynamic rendering is carried out to geodata using Webgl
Step is calculated using GPU.
Preferably, in the raster data dynamic rendering method, 0≤factor≤1.
Another embodiment of the present invention provides a kind of raster data dynamic rendering system, including the first module, for setting
Rendering parameter is set, the rendering parameter includes rendering upper limit value max, rendering lower limit value min and takes color table；Second module, is used for
Calculate the value of the rendering factor factor for each pixel, factor=(value-min)/(max-min), wherein value
It is the value of each pixel；And third module, for taking color table corresponding according to the rendering factor factor value of each pixel
Color, using Webgl to geodata carry out dynamic rendering.
Preferably, the raster data dynamic rendering system further includes：4th module, for whether detecting geodata
Caching, if uncached, requests geodata.
Preferably, in the third module of the raster data dynamic rendering system, geodata is carried out using Webgl
Dynamic renders, and is calculated using GPU.
In addition, being stored thereon with computer program, feature the present invention also provides a kind of computer readable storage medium
The step of being, the above method realized when which is executed by processor.
In addition, the present invention also provides a kind of computer equipment, including memory, processor and storage are on a memory simultaneously
The computer program run on a processor, which is characterized in that the processor realizes the above method when executing described program
Step.
By adopting the above technical scheme, Webgl is used for raster data dynamic rendering field, so that data handling procedure is located at
Browser does not consume server resource, reduces the requirement to server computational power, and only need first time request data and delay
After being stored to browser end, after browser end adjustment parameter, without request data again, different rendering effects can be realized.
Detailed description of the invention
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical solution of the present invention
It is briefly described：
Fig. 1 shows a kind of flow diagram of raster data dynamic rendering method of the application；
Fig. 2 shows a kind of block diagram representations of raster data dynamic rendering system of the application；
Fig. 3 shows the flow diagram of another raster data dynamic rendering method of the application；
Fig. 4 shows the block diagram representation of another raster data dynamic rendering system of the application；
Fig. 5 shows the schematic diagram according to the preferred embodiment of the invention for taking color table；
Fig. 6 (a)-(c) is shown under identical raster data, three kinds of same area different renderings when configuration difference takes color table
Effect picture.
Specific embodiment
In order to which the purpose of the present invention, technical solution and advantage is more clearly understood, with reference to the accompanying drawings and embodiments,
The present invention will be described in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention,
It is not intended to limit the present invention.
In following introductions, term " first ", " second " are only used for the purpose of description, and cannot be construed as to imply that it is opposite
Importance.
Following introductions provide multiple embodiments of the invention, and combination can be replaced or merged between different embodiments,
Therefore the present invention is it is also contemplated that all possible combinations comprising documented identical and/or different embodiments.Thus, if one
Embodiment includes feature A, B, C, another embodiment includes feature B, D, then the present invention also should be regarded as including containing A, B, C, D
The every other possible combined embodiments of one or more, although the embodiment may not have in the following contents it is clear
Literature record.
The present invention by adopting the above technical scheme, can generate isopleth in real time in a browser, and timeliness is fast, update efficiency and obtain
To greatly improving.
Fig. 1 show this application involves a kind of raster data dynamic rendering method specific embodiment, including following step
Suddenly：
Step 101, rendering parameter is set, and the rendering parameter includes rendering upper limit value max, rendering lower limit value min and takes
Color table.
Raster data source, which can be considered as in each pixel of screen, a digital value, such as following figure, a grid generation
One pixel of table, number represents the value on pixel, as follows：
It needs the extraneous parameter configured to have rendering upper limit value max, renders lower limit value min, take color table.Max and min is number
Word, taking color table is a colour band (preferably section be 0~1 colour band), for example, configuration 0~0.2 be it is red, 0.2~0.5 is yellow
Color, 0.5~1 is blue.
Step 102, the value of rendering factor factor, factor=(value-min)/(max- are calculated for each pixel
Min), wherein value be each pixel value.
For each pixel, its value value is taken out, calculates value factor factor together with max, min.For example,
It is 10, min 0 that max, which is arranged, in we, pixel point value 4, then factor=(value-min)/(max-min)=(4-0)/
(10-0)=0.4.
Step 103, the corresponding color of color table is being taken according to each pixel rendering factor factor value, over the ground using Webgl
It manages data and carries out dynamic rendering.
In example as above, factor=0.4,0.4 between 0.2~0.5, then taking color table with such as the left side in Fig. 5 for 0.4
After comparison, the rendering effect for obtaining the pixel is yellow, is rendered using the dynamic that Webgl carries out yellow to geodata.
In addition, color table is taken to may be set to be the color of transition, taken shown in color table on the right side of Fig. 5, if the value factor
Factor=0.4, then final color is the intermediate color between blue (0.2) and grey (0.5).
Webgl is used for raster data dynamic rendering field by the program, and solving the dynamic rendering of the end Web, there are data transmission
Limited speed, and all server-side is needed to recalculate, and transmit data again after adjustment parameter every time, after each adjustment parameter by
It is limited to the slower technical problem of network transfer speeds rendering speed, so that data handling procedure is located at browser, does not consume service
Device resource reduces requirement to server computational power, and after only needing first time request data and being cached to browser end,
After browser end adjustment parameter, without request data again, different rendering effects can be realized.
Preferably, it is contemplated that influence of the network transmission of massive spatial data to Information Service Quality, as shown in figure 3, this
The raster data dynamic rendering method of invention, further includes step：Whether detection geodata caches, if uncached, requests
Geodata.In this way, using the caching mechanism for being suitable for geodata, to improve the interactive performance of reliability-network-equivalent algorithm.
Preferably, it is contemplated that in geography information, especially remote sensing image information, processing for mass data, operand
It is very huge, therefore, in the raster data dynamic rendering method of the application, dynamic rendering is carried out to geodata using Webgl
The step of, it is to be calculated using GPU.Can based on the image processing of GPU concurrent technique, consider algorithm be related to and handle appoint
The division of business, realizes and executes optimization, memory optimization, instruction using optimization, basic herein to improve whole treatment effeciency
The upper resampling realized for remote sensing geography image data accelerates, and significantly improves computational efficiency.
Preferably, it is contemplated that since raster data is expressed by 0~255 different gray values, in order to simplify algorithm, this
2 grayscale are set to innovation by the factor value for taking colour band, i.e., 0 and 1 two-stage, rendered color needed for whole is corresponding
In factor value 0-1.In this way, being arranged by colour band and three gray values being reduced to the decimal in 0-1, reach in standard
Really while expression color, significantly simplifies the chrominance representation method of each pixel, further speed up arithmetic speed.
Fig. 2 shows this application involves a kind of raster data dynamic rendering system specific embodiment, including：
First module 201, for rendering parameter to be arranged, the rendering parameter includes rendering upper limit max, rendering lower limit min
With take color table；Second module 202, for calculating the value of rendering factor factor, factor=(value-min)/(max-
Min), wherein value be each pixel value；And third module 203, for taking color according to rendering factor factor value
The corresponding color of table carries out dynamic rendering to geodata using Webgl.
Preferably, it is contemplated that influence of the network transmission of massive spatial data to Information Service Quality, as shown in figure 4, this
The raster data dynamic rendering system of invention further includes：4th module 204, for detecting whether geodata caches, if not
Caching, then request geodata.In this way, using the caching mechanism for being suitable for geodata, to improve reliability-network-equivalent algorithm
Interactive performance.
Fig. 6 is shown under identical raster data, three kinds of same area different rendering effect figures when configuration difference takes color table.
Foregoing provide multiple embodiments of the invention, it will be understood by those skilled in the art that can between different embodiments
To replace or merge combination, therefore the present invention is it is also contemplated that can comprising documented identical and/or different all of embodiment
It can combination.Thus, if one embodiment includes feature A, B, C, another embodiment includes feature B, D, then the present invention
It should be regarded as including the every other possible combined embodiment of one or more containing A, B, C, D, although the embodiment may
There is not specific literature record in the following contents.
" module " and " unit " in this specification is to refer to complete independently or complete specific function with other component cooperation
The software and/or hardware of energy, wherein hardware for example can be FPGA (Field-Programmable Gate Array, scene
Programmable gate array), IC (Integrated Circuit, integrated circuit) etc..
The present invention also provides a kind of computer readable storage mediums, are stored thereon with computer program, which is located
Reason device realizes the step of above-mentioned method for empowerment management control request when executing.Wherein, computer readable storage medium can
To include but is not limited to any kind of disk, including floppy disk, CD, DVD, CD-ROM, mini drive and magneto-optic disk, ROM,
RAM, EPROM, EEPROM, DRAM, VRAM, flash memory device, magnetic or optical card, nanosystems (including molecular memory
IC), or it is suitable for any kind of medium or equipment of store instruction and/or data.
The present invention also provides a kind of computer equipment, including memory, processor and storage are on a memory and can be
The computer program run on processor, which is characterized in that processor is realized when executing program for empowerment management control request
Method the step of.In embodiments of the present invention, processor is the control centre of computer system, can be the processing of physical machine
Device is also possible to the processor of virtual machine.
It is described above to be merely a preferred embodiment of the present invention, any essence and formal limit not are made to the present invention
System.Although the present invention is disclosed as above with preferred embodiment, however, it is not intended to limit the invention, for those skilled in the art
Member for, without departing from the scope of the present invention, can use the disclosure above technology contents make it is various change and
The equivalent embodiment of variation.In every case without departing from the spirit and principles in the present invention, implement according to the technical essence of the invention to above
Any simple modification, equivalent replacement, improvement made by example etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of raster data dynamic rendering method, which is characterized in that including：
Rendering parameter is set, and the rendering parameter includes rendering upper limit value max, rendering lower limit value min and takes color table；
For each pixel calculate rendering factor factor value, factor=(value-min)/(max-min), wherein
Value is the value of each pixel；And
The corresponding color of color table is being taken according to the rendering factor factor value of each pixel, geodata is being carried out using Webgl
Dynamic renders.
2. raster data dynamic rendering method as described in claim 1, further includes：
Whether detection geodata caches, if uncached, requests geodata.
3. raster data dynamic rendering method as described in claim 1, wherein
The step of dynamic renders is carried out to geodata using Webgl, is calculated using GPU.
4. raster data dynamic rendering method as described in claim 1, wherein 0≤factor≤1.
5. a kind of raster data dynamic rendering system, which is characterized in that including：
First module, for rendering parameter to be arranged, the rendering parameter includes rendering upper limit value max, rendering lower limit value min and takes
Color table；
Second module, for calculating the value of rendering factor factor, factor=(value-min)/(max- for each pixel
Min), wherein value be each pixel value；And
Third module uses Webgl pairs for taking the corresponding color of color table according to the rendering factor factor value of each pixel
Geodata carries out dynamic rendering.
6. raster data dynamic rendering system as claimed in claim 5, further includes：
If 4th module, uncached, requests geodata for detecting whether geodata caches.
7. raster data dynamic rendering system as claimed in claim 5, in third module, using Webgl to geodata into
Mobile state rendering, is calculated using GPU.
8. raster data dynamic rendering system as claimed in claim 5, wherein 0≤factor≤1.
9. a kind of computer equipment including memory, processor and stores the meter that can be run on a memory and on a processor
Calculation machine program, which is characterized in that the processor is realized described of any of claims 1-4 when executing described program
The step of method.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
It realizes when execution such as the step of the method for any of claims 1-4.
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| CN111198975A (en) * | 2019-12-25 | 2020-05-26 | 上海杰狮信息技术有限公司 | Grid-based space-time big data visualization method and visualization system |
| CN116342820A (en) * | 2023-03-01 | 2023-06-27 | 北京数识科技有限公司 | Raster data color distribution system, method and computer readable storage medium |
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| CN108898644B (en) | 2022-09-16 |
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