CN104077100A - Composite buffer area image display method and device - Google Patents
Composite buffer area image display method and device Download PDFInfo
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- CN104077100A CN104077100A CN201410299168.7A CN201410299168A CN104077100A CN 104077100 A CN104077100 A CN 104077100A CN 201410299168 A CN201410299168 A CN 201410299168A CN 104077100 A CN104077100 A CN 104077100A
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Abstract
The invention provides a composite buffer area image display method and a composite buffer area image display device. The method comprises the following steps of: when receiving a command for displaying the image of a buffer area, creating a canvas having a transparent channel; drawing each buffer area image on the canvas; obtaining transparence of pixel points in the buffer area images on the canvas, and judging whether the corresponding pixel point belongs to a composite buffer area image according to the transparence; if yes, recoloring the corresponding pixel point according to the transparence and a pre-building color comparison table, and displaying each recolored pixel point. According to the composite buffer area image display method and device, information of the composite buffer area information is prevented from losing, occupation of CPU resources is reduced, and the image displaying efficiency of the composite buffer area is improved.
Description
Technical field
The present invention relates to image and show field, particularly relate to a kind of composite buffering district's method for displaying image and a kind of composite buffering district image display device.
Background technology
Fast-developing and ripe along with computer technology and surveying and mapping technology, generalized information system (Geographic Information System, Geographic Information System) use more and more common, not only there is application in professional aviation, military field, also use very generally in popular field, such as the map software of various mobile devices.It is a conventional function in generalized information system that buffer zone shows, expresses the degree of the outside radiation effect of certain generalized information system key element.Key element comprises point, line and face etc. geometry entity.The region of certain distance around this geometry entity, is exactly the buffer zone of this geometry entity, certain color is set and shows conventionally need to this buffer zone.
The composite buffering district showing in generalized information system is in the market all the simple superposition of original area, uses buffer zone easily to cause buffer information to lose in prior art.For example: it is the dot buffer zone B1 (the round region centered by A) of 50 meters that there is a radius A position in generalized information system, use red expression, having another radius in B position is the dot buffer zone B2 of 60 meters, B2 uses black to represent, and there is overlapping region B3 in B1 and B2, overlapping region can only shown in red or black like this, if generalized information system first shows B1, show again B2, B3 is shown as black as a part of B2 like this, but it has also just been lost as the information of a B1 part.
The problem of losing in order to solve above-mentioned buffer information, in classic method, utilizes generalized information system to every two judgements whether buffer zone all superposes, and calculates overlap-add region (composite buffering district), then overlap-add region is arranged to another kind of color.But the kind method of employing, need to expend larger cpu resource conventionally, thereby the efficiency that causes composite buffering district image to show is lower.
Summary of the invention
Based on this, the invention provides a kind of composite buffering district's method for displaying image and device, can prevent that buffer information from losing and improving the efficiency that composite buffering district image shows.
For achieving the above object, the present invention adopts following technical scheme:
A kind of composite buffering district method for displaying image, comprises the following steps:
In the time receiving the instruction of display buffer image, create the painting canvas with transparent channel;
By each buffer zone Image Rendering on described painting canvas;
The transparency of obtaining pixel in the image of the interior each buffer zone of painting canvas, judges according to described transparency whether corresponding pixel belongs to composite buffering district image;
If so, according to described transparency and the CLUT building be in advance that corresponding each pixel is restained, and show the each pixel after restaining.
A kind of composite buffering district image display device, comprising:
Painting canvas creation module, in the time receiving the instruction of display buffer image, creates the painting canvas with transparent channel;
Drafting module, for by each buffer zone Image Rendering in described painting canvas;
Judge module, for obtaining the transparency of each buffer zone image pixel in painting canvas, and judges according to described transparency whether corresponding pixel belongs to composite buffering district image;
Painted and display module, for when the judged result of described judge module is when being, according to described transparency and the CLUT building be in advance that corresponding each pixel is restained, and show the each pixel after restaining.
Can be found out by above scheme, a kind of composite buffering district's method for displaying image of the present invention and device, after each buffer zone Image Rendering is on painting canvas, by obtaining in painting canvas the transparency of pixel in the image of each buffer zone, only need to judge according to described transparency whether corresponding pixel belongs to composite buffering district image, if so, according to described transparency and the CLUT building be in advance that the pixel of composite buffering district image is restained, and the pixel of restaining is shown.The invention solves the problem that causes buffer information to lose due to composite buffering district image in the time superposeing, avoid calculating the process of overlap-add region, draw the pixel of composite buffering district image by the transparency judgement to respective pixel point, after the pixel of composite buffering district image being restained in conjunction with described transparency and CLUT, show restaining rear composite buffering district image again, thereby avoid information dropout, reduce the taking of cpu resource, improved the efficiency that composite buffering district image shows.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of a kind of composite buffering of the present invention district method for displaying image;
Fig. 2 is the structural representation of a kind of composite buffering of the present invention district image display device.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Shown in Figure 1, a kind of composite buffering district method for displaying image, comprises the following steps:
Step S101, in the time receiving the instruction of display buffer image, creates the painting canvas with transparent channel; Then enter step S102.It should be noted that, described painting canvas band transparent channel, can be therefore the transparency of each pixel in this painting canvas as required, and for example, in one of them embodiment, in this painting canvas, the transparency of each pixel is zero.Conventionally, draw described buffer zone image on painting canvas before, in whole painting canvas image, the transparency of each pixel is identical.Before drawing, in painting canvas image, the transparency of each pixel is not identical with the transparency of each pixel in the image of buffer zone.
If receive for the first time the instruction of display buffer image, also need to build a CLUT.Build a color array vecColor, array length is 256, and array index represents transparence information, the predetermined color in the described lightness information corresponding color table of comparisons.For example: vecColor[50]=RGB (10,50,200), expression transparency is that the color value of 50 correspondences is RGB (10,50,200).Especially, vecColor[0 should be set]=-1, vecColor[200]=-1, represent that transparency is 0 or 200 color value invalid (not needing to process).
Be W when the display frame of generalized information system is wide, height is H, in the time receiving the instruction of wanting display buffer image; Director data can comprise summit, color Color (RGBA) and the buffer distance of each buffer zone image.The transparency that always has under normal circumstances some buffer zones image is all identical.Suppose transparency A0=200.So can be by the buffer zone Image Rendering with identical transparency in same painting canvas.
Step S102, by each buffer zone Image Rendering on described painting canvas; Then enter step S103.For example described painting canvas is a PNG image, and its size can be identical with display frame.Conventionally need to, according to the summit, color Color (RGBA) and the buffer distance that obtain each buffer zone image by buffer zone Image Rendering and painting canvas, draw concrete drawing process and can be prior art, herein by it will not go into details.
Step S103, obtains in painting canvas the transparency of pixel in the image of each buffer zone, judges according to described transparency whether corresponding pixel belongs to composite buffering district image; If so, enter step S104.Otherwise the pixel of corresponding buffer zone image does not superpose, painted without re-starting.It should be noted that, the color transparency that described transparency is respective pixel point, for example, described transparency can be the value that gets A component in RGBA.
As a good embodiment, described in obtain in painting canvas the process of the transparency of pixel in the image of each buffer zone, specifically can comprise the following steps:
Step S1031, carries out graphical analysis to painting canvas, and on painting canvas, sets up coordinate system; Then enter step S1032.For example, painting canvas is carried out after graphical analysis, the result of analysis is: the wide height of whole picture of painting canvas is respectively W, H, and painting canvas is made up of W*H pixel, and the transparency of painting canvas is zero.The horizontal vernier iw of painting canvas is set on this painting canvas: numerical value is from 0 to w-1, and longitudinal vernier ih of painting canvas: numerical value is from 0 to h-1.
Step S1032, obtains the coordinate pixel of coordinate system; Then enter step S1033.For example, the ih that obtains coordinate system is capable, the image slices vegetarian refreshments pix of iw row.
Step S1033, extracts the transparency of each coordinate pixel, judges whether the transparency of each coordinate pixel equates with the transparence value of pixel in painting canvas image; If not, so enter step S1034.For example, from pix, isolate A value, be the transparency of this pix: A=alphaX; From the RGBA of pix, get the value of A component; If alphaX=0, this pixel does not belong to the buffer zone image of painting canvas, otherwise this pix belongs to for buffer zone.It should be noted that, the coordinate pixel extracting in this step comprises: do not belong to buffer zone image pixel, belong to buffer zone image but do not belong to the pixel of composite buffering district image, and belong to buffer zone image and belong to the pixel in composite buffering district.
Step S1034, if the judged result of described step S1033 is no, judges the pixel that this coordinate pixel is buffer zone image, and obtains the transparency of corresponding coordinate pixel.It should be noted that, the transparency of now obtaining is the transparency of pixel in the image of buffer zone.If so, represent that this pixel does not belong to the buffer zone image in painting canvas.
As a good embodiment, describedly judge that according to described transparency whether corresponding pixel belongs to the process of composite buffering district image, specifically can comprise the following steps:
Step S1035, compares the transparency of pixel in each buffer zone image on painting canvas and the transparency of drawing pixel in the image of front each buffer zone; Then enter step S1036.If in the image of each buffer zone, the transparency of pixel is A0 before drawing, after being plotted on painting canvas, the transparency A0 ' of pixel in corresponding buffer zone image on painting canvas is compared with the transparency A0 size of drawing pixel in the image of front each buffer zone.
Step S1036, judges on painting canvas in the image of each buffer zone according to result relatively whether the transparency of pixel changes; If so, enter step S1037.For example, the result judging be on painting canvas in the image of each buffer zone the transparency A0 ' of pixel with draw before in each buffer zone image the transparency A0 of pixel unequal, there is variation in explanation, and therefore on painting canvas, the pixel of corresponding buffer zone image belongs to composite buffering district image.Otherwise the pixel of corresponding buffer zone image only belongs to simple buffer zone image on this painting canvas, do not carry out stack, can judge next pixel.
Step S1037, if described step S1036 judged result when being, judges that in painting canvas, corresponding pixel belongs to composite buffering district image.For example, in composite buffering district image, the transparency of pixel is neither 0 to be also not equal to A0.
Step S104, if the judged result of described step S103 is when being, according to described transparency and the CLUT building be in advance that corresponding pixel is restained, and show the each pixel after restaining.For example, according to described transparent and contrast color table, find vecColor[A0 ']=RGB0 '; The color that this pix is set is RGB0 ', and transparency is A0 '.Whether this programme is by using same pixel after stack, and transparency can change, be composite buffering district image thereby find and detect this pixel.Then according to the transparency color combining table of comparisons after changing, each pixel in composite buffering district image is restained, the region representation of restaining is the information of buffering stack.
It should be noted that, under normal circumstances can be after all composite bufferings district in same painting canvas be restained, the more all buffer zones image on whole painting canvas is together shown.For example, can, by all buffer zones Image Rendering on PNG image to GIS interface, because each pixel of composite buffering district image is restained, so composite buffering district image can show accurately, prevent information dropout.
As a good embodiment, when painting canvas in establishment with transparent channel, can comprise: in described painting canvas image, the transparency of pixel is set to zero.
As a good embodiment, by before each buffer zone Image Rendering is on described painting canvas, can comprise the following steps:
Obtain the pixel of each buffer zone image before drawing, and extract the transparency of drawing front each pixel.
As a good embodiment, by before each buffer zone Image Rendering is on described painting canvas, can also comprise the following steps:
According to the transparency size of pixel in each buffer zone image before drawing, classified in each buffer area.
Corresponding with above-mentioned a kind of composite buffering district method for displaying image, the present invention also provides a kind of composite buffering district image display device, as shown in Figure 2, comprising:
Painting canvas creation module 101, in the time receiving the instruction of display buffer image, creates the painting canvas with transparent channel;
Drafting module 102, for by each buffer zone Image Rendering in described painting canvas;
Judge module 103, for obtaining the transparency of each buffer zone image pixel in painting canvas, and judges according to described transparency whether corresponding pixel belongs to composite buffering district image;
Painted and display module 104, for when the judged result of described judge module is when being, according to described transparency and the CLUT building be in advance that corresponding each pixel is restained, and show the each pixel after restaining.
As a good embodiment, described judge module specifically can comprise:
Establishment of coordinate system module, for painting canvas is carried out to graphical analysis, and sets up coordinate system on painting canvas;
Coordinate pixel acquisition module, for obtaining the coordinate pixel of coordinate system;
The first judge module, for obtaining the transparency of each coordinate pixel, judges whether the transparency of each coordinate pixel equates with the transparence value of pixel in painting canvas image;
The first determination module, when being no when the judged result of described the first judge module, judging the pixel that this coordinate pixel is buffer zone image, and obtains the transparency of corresponding coordinate pixel.
As a good embodiment, a kind of composite buffering of the present invention district image display device can also comprise:
Transparency extraction module, for obtaining the pixel of drawing front each buffer zone image, and extracts the transparency of drawing front each pixel.
As a good embodiment, described judge module specifically can also comprise:
Comparison module, for comparing the transparency of each buffer zone image pixel on painting canvas and the transparency of drawing pixel in the image of front each buffer zone;
The second judge module, for judging according to result relatively whether the transparency of each buffer zone image pixel on painting canvas changes;
The second determination module, with when the judged result of described the second judge module is when being, judges in painting canvas that pixel belongs to composite buffering district image accordingly.
Other technical characterictic of above-mentioned a kind of composite buffering district image display device is identical with a kind of composite buffering of the present invention district method for displaying image, and it will not go into details herein.
Can find out by above scheme, a kind of composite buffering district's method for displaying image of the present invention and device, after each buffer zone Image Rendering is on painting canvas, by obtaining in painting canvas the transparency of pixel in the image of each buffer zone, only need to judge according to described transparency whether corresponding pixel belongs to composite buffering district image, if so, according to described transparency and the CLUT building be in advance that the pixel of composite buffering district image is restained, and the pixel of restaining is shown.The invention solves the problem that causes buffer information to lose due to composite buffering district image in the time superposeing, avoid calculating the process of overlap-add region, draw the pixel of composite buffering district image by the transparency judgement to respective pixel point, after the pixel of composite buffering district image being restained in conjunction with described transparency and CLUT, show restaining rear composite buffering district image again, thereby avoid information dropout, reduce the taking of cpu resource, improved the efficiency that composite buffering district image shows.
Unless context separately has the description of specific distinct, the element in the present invention and assembly, the form that quantity both can be single exists, and form that also can be multiple exists, and the present invention does not limit this.Although the step in the present invention is arranged with label, and be not used in and limit the precedence of step, unless expressly stated the order of step or the execution of certain step need other steps as basis, otherwise the relative order of step is adjustable.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a composite buffering district method for displaying image, is characterized in that, comprises the following steps:
In the time receiving the instruction of display buffer image, create the painting canvas with transparent channel;
By each buffer zone Image Rendering on described painting canvas;
The transparency of obtaining pixel in the image of the interior each buffer zone of painting canvas, judges according to described transparency whether corresponding pixel belongs to composite buffering district image;
If so, according to described transparency and the CLUT building be in advance that corresponding pixel is restained, and show the each pixel after restaining.
2. composite buffering according to claim 1 district method for displaying image, is characterized in that, when painting canvas in establishment with transparent channel, comprises the following steps:
In described painting canvas image, the transparency of pixel is set to zero.
3. composite buffering according to claim 2 district method for displaying image, is characterized in that, described in obtain in painting canvas the process of the transparency of pixel in the image of each buffer zone, comprise the following steps:
Painting canvas is carried out to graphical analysis, and on painting canvas, set up coordinate system;
Obtain the coordinate pixel of coordinate system;
Extract the transparency of each coordinate pixel, judge whether the transparency of each coordinate pixel equates with the transparency of pixel in painting canvas image;
If not, judge the pixel that this coordinate pixel is buffer zone image, and obtain the transparency of corresponding coordinate pixel.
4. composite buffering according to claim 1 and 2 district method for displaying image, is characterized in that, by before each buffer zone Image Rendering is on described painting canvas, further comprising the steps of:
Obtain the pixel of each buffer zone image before drawing, and extract the transparency of drawing front each pixel.
5. composite buffering according to claim 4 district method for displaying image, is characterized in that, judges that according to described transparency the process whether corresponding pixel belongs to composite buffering district image comprises the following steps:
The transparency of pixel in each buffer zone image on painting canvas and the transparency of drawing pixel in the image of front each buffer zone are compared;
Judge on painting canvas in the image of each buffer zone according to result relatively whether the transparency of pixel changes;
If so, judge that in painting canvas, corresponding pixel belongs to composite buffering district image.
6. composite buffering according to claim 4 district method for displaying image, is characterized in that, by before each buffer zone Image Rendering is on described painting canvas, further comprising the steps of:
According to the transparency size of pixel in each buffer zone image before drawing, classified in each buffer area.
7. a composite buffering district image display device, is characterized in that, comprising:
Painting canvas creation module, in the time receiving the instruction of display buffer image, creates the painting canvas with transparent channel;
Drafting module, for by each buffer zone Image Rendering in described painting canvas;
Judge module, for obtaining the transparency of each buffer zone image pixel in painting canvas, and judges according to described transparency whether corresponding pixel belongs to composite buffering district image;
Painted and display module, for when the judged result of described judge module is when being, according to described transparency and the CLUT building be in advance that corresponding each pixel is restained, and show the each pixel after restaining.
8. composite buffering according to claim 7 district image display device, is characterized in that, described judge module comprises:
Establishment of coordinate system module, for painting canvas is carried out to graphical analysis, and sets up coordinate system on painting canvas;
Coordinate pixel acquisition module, for obtaining the coordinate pixel of coordinate system;
The first judge module, for obtaining the transparency of each coordinate pixel, judges whether the transparency of each coordinate pixel equates with the transparence value of pixel in painting canvas image;
The first determination module, when being no when the judged result of described the first judge module, judging the pixel that this coordinate pixel is buffer zone image, and obtains the transparency of corresponding coordinate pixel.
9. according to the composite buffering district image display device described in claim 7 or 8, it is characterized in that, also comprise:
Transparency extraction module, for obtaining the pixel of drawing front each buffer zone image, and extracts the transparency of drawing front each pixel.
10. composite buffering according to claim 9 district image display device, is characterized in that, described judge module comprises:
Comparison module, for comparing the transparency of each buffer zone image pixel on painting canvas and the transparency of drawing pixel in the image of front each buffer zone;
The second judge module, for judging according to result relatively whether the transparency of each buffer zone image pixel on painting canvas changes;
The second determination module, with when the judged result of described the second judge module is when being, in judgement painting canvas, pixel belongs to composite buffering district image accordingly.
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| CN106327564A (en) * | 2016-08-25 | 2017-01-11 | 河南理工大学 | Image processing method and device |
| CN106909283A (en) * | 2016-11-01 | 2017-06-30 | 广州视源电子科技股份有限公司 | Painting canvas display control method and system |
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| CN101789030A (en) * | 2010-02-03 | 2010-07-28 | 南京师范大学 | Virtual geographical environment (VGE) symbolic model and map symbol sharing system and method based on same |
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| CN109538189A (en) * | 2018-09-27 | 2019-03-29 | 核工业北京地质研究院 | Method based on image real-time display in ultrasonic image logging data acquisition |
| CN114419193A (en) * | 2022-01-24 | 2022-04-29 | 北京思明启创科技有限公司 | Image drawing method, image drawing device, electronic equipment and computer-readable storage medium |
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