CN101321240B - Method and device for multi-drawing layer stacking - Google Patents
Method and device for multi-drawing layer stacking Download PDFInfo
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Abstract
The embodiment of the invention provides a method and device of stacking multi layer. The method of stacking multi layer comprises: obtaining the data of the current layer and the data of the layer needed to be stacked; executing frame processing to the obtained data of the layer needed to be stacked; executing stack processing to the current layer and the layer needed to be stacked executed by framing processing to obtain the stacked image result. The technical proposal provided by the embodiment of the invention is able to realize to rapidly adjust the video or transparency of the image and solve the problem of unclarity of the layer after stacking.
Description
Technical field
The present invention relates to multimedia technology field, particularly a kind of method and device thereof of multi-layer image stack.
Background technology
The multi-layer image superimposing technique is widely used in a large amount of video equipments at present.In fields such as digital broadcasting, handheld device, video monitorings a large amount of application is arranged also.Called number map is stacked to be added is multi-channel video or image to be mixed mutually superpose, thereby can see the video or the image of multichannel a picture the inside, and does not need extra display device.Conventional multi-channel video or image blend superimposing technique mainly adopt the method for transparent stack (being the alpha stack).
The scheme of conventional multi-channel video or image overlay is direct hybrid plan: earlier the two-path video of same position or image are written to respectively separately in the corresponding cache unit by each self-corresponding input unit, by each self-corresponding read-write control unit two-path video or image synchronization are read the image after superposeing from output unit output through superpositing unit processing back then.
When changing the transparent ratio of one road video wherein or image if desired, need change the alpha numerical value of all pixel values of this road video or image by superpositing unit, it is complicated therefore can to cause system to use, and response speed is slow; And, under the more approaching situation of the brightness of two-path video or image and colourity, can be submerged in other one road video or image the inside through road video after the transparent stack or image, be not easy to differentiate.
Therefore, in carrying out the invention process, the inventor finds that there are the following problems at least in the prior art: in the technical scheme that provides on the prior art, the unsharp problem of figure layer may take place after image transparency adjustment process complexity and multi-channel video or the image overlay.
Summary of the invention
The embodiment of the invention provides a kind of method and device thereof of multi-layer image stack, may the unsharp problem of generation figure layer after can realizing the transparency of rapid adjustment video or image and solving image overlay.
The embodiment of the invention provides a kind of method of multi-layer image stack, and it comprises:
The data of obtaining the data of current layer and needing stacking chart's layer;
The described data of obtaining that need stacking chart's layer are carried out frame handle, comprising: in the size and the style that need to add frame on stacking chart's layer or adjust existing frame;
The figure layer of the needs stack of handling with current layer with through frame according to the overall pixel transparency value that is provided with carries out overlap-add procedure, the image result after obtaining superposeing.
The embodiment of the invention also provides a kind of device of multi-layer image stack, and it comprises:
The first figure layer data acquiring unit is used to obtain the data of current layer;
The second figure layer data acquiring unit is used to obtain the data that need stacking chart's layer;
The frame processing unit is used for that the described data of obtaining that need stacking chart's layer are carried out frame and handles, and is included in the size and the style that need to add frame on stacking chart's layer or adjust existing frame;
Superpositing unit, the figure layer that is used for the needs stack handled with current layer with through frame according to the overall pixel transparency value that is provided with carries out overlap-add procedure, the image result after obtaining superposeing.
The method and the device thereof of the multi-layer image stack that provides by the embodiment of the invention carry out frame to the data that need stacking chart's layer and handle, and therefore can avoid after the image overlay may the unsharp problem of generation figure layer; And can realize the transparency of rapid adjustment video or image by adjusting overall pixel value.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the signaling process figure of an embodiment of method of multi-layer image stack of the present invention;
Fig. 2 is the structural representation of an embodiment of device of multi-layer image stack of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention provides a kind of method of multi-layer image stack, and it comprises:
The data of obtaining the data of current layer and needing stacking chart's layer;
The described data of obtaining that need stacking chart's layer are carried out frame to be handled;
The figure layer of the needs stack of handling with current layer with through frame according to the overall pixel transparency value that is provided with carries out overlap-add procedure, the image result after obtaining superposeing.
The method of the multi-layer image stack that provides by the above embodiment of the present invention is carried out frame to the data that need stacking chart's layer and is handled, and therefore can avoid after the image overlay may the unsharp problem of generation figure layer; And can realize the transparency of rapid adjustment video or image by adjusting overall pixel value.
Please refer to Fig. 1, be the signaling process figure of the embodiment of method of multi-layer image of the present invention stack.What realize in the present embodiment is the stack of two figure layers, and wherein, the first figure layer is a current layer, and the second figure layer is for being superimposed to the figure layer on the current layer.Locate to begin to superpose the second figure layer at the coordinate (0,0) of the first figure layer, wherein, the first figure layer is 720 * 480 video, and the second figure layer is the adjusting menu (OSD, On Screen Display) of 32 * 32 screen display.
Its detailed process comprises:
Step 201: after receiving outside enabling signal, the multi-layer image stacking apparatus is started working;
Step 202: obtain current layer, i.e. the data of the image macro in the first figure layer comprise size, coordinate, boundary information, pixel value of image macro etc.;
The process of obtaining the data of the image macro in the first figure layer specifically comprises:
The first figure layer read-write control unit sends the image macro data application order of current layer to the first figure layer input unit;
The first figure layer input unit be according to described image macro data application order, reads the data of the image macro the first figure layer from external memory storage;
The data of the image macro in the first figure layer that the first figure layer input unit will read send to the first figure layer read-write control unit.
Step 203: the data of the image macro in the first figure layer that buffer memory obtained;
The concrete mode of data of the image macro in the first figure layer that buffer memory obtained is:
The image macro data of the first figure layer that the first figure layer read-write control unit will receive are input to the first corresponding buffer unit and carry out buffer memory.
Step 204: according to the size and the position relation of a plurality of figure layers that dispose, judge the first figure layer, the second figure layer that whether needs to superpose, if, then obtain the data of the image macro in the second figure layer, comprise size, coordinate, boundary information, pixel value of image macro etc.;
The data of obtaining the image macro in the second figure layer specifically comprise:
The second figure layer read-write control unit sends image macro data application order to the second figure layer input unit;
The second figure layer input unit be according to described image macro data application order, reads the data of the image macro the second figure layer from external memory storage;
The data of the image macro in the second figure layer that the second figure layer input unit will read send to the second figure layer read-write control unit.
In the present embodiment, need be at the coordinate (0,0) of the first figure layer second figure layer of locating to superpose, promptly size is 32 * 32 OSD figure layer.
The second figure layer input unit can pass through the video high performance bus, send data read signal to external memory storage, external memory storage returns every data of image macro according to described data read signal, comprises the size of image macro, coordinate, boundary information, pixel value etc.
For example, in the present embodiment, the second figure layer is 32 * 32 OSD figure layer, and externally in the memory, the second figure layer comprises two image macro, and the size of each image macro is 16 * 32, and the height of expression macro block is 16 row, and width is 32 pixels.
Step 205: the data of the image macro in the second figure layer that buffer memory obtained;
The concrete mode of data of the image macro in the second figure layer that buffer memory obtained is:
The second figure layer read-write control unit from the image macro data that external memory storage reads, is written to the described second figure layer input unit to carry out buffer memory in second buffer unit.
In the present embodiment, the data of first macro block that the second figure layer read-write control unit reads the second figure layer input unit, be written in second buffer unit, continue the data of second macro block that the second figure layer input unit read then, be written in second buffer unit.
Therefore in the present embodiment, the second buffer unit size can be stored two image macro data, second buffer unit image macro that can store the described second figure layer.
Step 206: the image macro of the second figure layer is carried out frame handle;
The image macro of the second figure layer is carried out the frame processing specifically to be comprised:
The second figure layer read-write control unit read the data of the image macro of the second figure layer stored in second buffer unit, and sends to the frame processing unit;
The frame processing unit carries out frame to the image macro of the second figure layer of input to be handled, and for example adds frame on the edge of the second figure layer, perhaps adjusts the size of existing frame and style etc., and the size of described frame and style can be configured by dispensing unit.
Step 207: the alpha value to each picture element correspondence of the second figure layer macro block is handled, and obtains the stack transparency value of second each picture element of figure layer;
The alpha value of calculating second each picture element correspondence of figure layer specifically comprises:
The data of the image macro of the second figure layer that the frame processing unit will be handled send to the pixel processing unit;
The pixel processing unit obtains the alpha value of each picture element correspondence of the second figure layer;
The alpha value of each picture element correspondence of the second figure layer is multiplied each other with overall alpha value respectively, obtain the stack transparency value of each picture element of the second figure layer, described overall alpha value is used for the stack transparency value of each picture element of the rapid adjustment second figure layer, can the unit be set by overall alpha value and adjust.
Step 208: the stack transparency value according to second each pixel of figure layer that calculates gained superposes the second figure layer macro block and the first figure layer macro block picture material of output stack.
Specifically comprise:
The first figure layer read-write control unit read the data of the image macro of the first figure layer stored in first buffer unit, is sent to superpositing unit, and the pixel processing unit is sent to superpositing unit with the data of the image macro of the treated second figure layer;
According to the stack transparency value of second each pixel of figure layer that calculates gained, adopt the method for transparent stack, the image result after obtaining superposeing.
The computing formula of this method is as the following formula shown in 1:
result＝α×source2+(1-α)×source1(1)
Source1 in the above-mentioned formula 1 represents the value of a picture element of the first figure layer, and source2 represents the value of another picture element of the second figure layer, and result represents the result after the transparent stack, and α is the stack transparency value of second this picture element of figure layer.Through the image after the alpha stack, in the zone of multi-channel video or image overlay, both can see the content among the source1, also can see the content among the source2.In the present embodiment, what realize is the stack of two figure layers, stack for figure layer more than three, it realizes that principle is basic identical: at first obtain the current layer data, and each figure layer data that need superpose, then each figure layer that need superpose is carried out frame processing and the calculating of stack transparency value, last and current layer carries out overlap-add procedure.
The method of the multi-layer image stack that provides by the above embodiment of the present invention is carried out frame to the data that need stacking chart's layer and is handled, and therefore can avoid after the image overlay may the unsharp problem of generation figure layer; And can realize the transparency of rapid adjustment video or image by adjusting overall pixel transparency value.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-OnlyMemory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Please refer to Fig. 2, be the structure chart of the embodiment of device of multi-layer image of the present invention stack.In the present embodiment, for realizing the device of two figure layers stack.
The device of described multi-layer image stack comprises the first figure layer data acquiring unit 31, the second figure layer data acquiring unit 32, frame processing unit 33, stack transparency value unit 34, superpositing unit 35.
The described first figure layer data acquiring unit 31 is used to obtain the data of current layer;
The described second figure layer data acquiring unit 32 is used for the data of the current layer that obtains according to the first figure layer data acquiring unit 31, obtains the data that need stacking chart's layer;
Described frame processing unit 33 is used for that the data that need stacking chart's layer that the described second figure layer data acquiring unit 32 obtains are carried out frame and handles;
Described superpositing unit 35, the figure layer that is used for the needs stack handled with current layer with through frame according to the overall pixel transparency value that is provided with carries out overlap-add procedure, the image result after obtaining superposeing.
Described stack transparency value unit 34 is used for calculating the stack transparency value that needs stacking chart's layer according to the overall pixel transparency value that is provided with; Described superpositing unit 35 specifically is used for the stack transparency value according to described needs stacking chart layer, and the figure layer of the needs stack of handling with current layer with through frame carries out overlap-add procedure, the image result after obtaining superposeing.
The device of described multi-layer image stack can also comprise output unit 39, is used to export the image result after the described superpositing unit 35 resulting stacks.
The device of described multi-layer image stack can also comprise:
The described first figure layer data acquiring unit 31 may further include:
The first figure layer read-write control unit 311 according to the work enabling signal, sends image macro data application order;
The first figure layer input unit 312 according to described image macro data application order, reads the data of the image macro the current layer from external memory storage, and returns to the first figure layer read-write control unit 311.
The device of described multi-layer image stack can also comprise judging unit 38, is used for the data of the current layer that obtains according to the first figure layer data acquiring unit 31, judges whether current layer needs stacking chart's layer.
The described second figure layer data acquiring unit 32 may further include:
The second figure layer read-write control unit 321 needs stacking chart's layer if the judged result of judging unit 38 is a current layer, then sends image macro data application order;
The second figure layer input unit 322 according to described image macro data application order, reads the data of the image macro the current layer from external memory storage, and returns to the second figure layer read-write control unit 321.
Described stack transparency value unit 34 further comprises:
Pixel value acquiring unit 341 is used to obtain the pixel value of each picture element correspondence that needs stacking chart's layer;
Overall situation pixel transparency value is provided with unit 342, is used to be provided with overall pixel transparency value;
The device of the multi-layer image stack that provides by the above embodiment of the present invention, frame processing unit carry out frame to the data that need stacking chart's layer to be handled, and therefore can avoid after the image overlay may the unsharp problem of generation figure layer; And the transparency of rapid adjustment video or image can be realized by adjusting overall pixel transparency value in stack transparency value unit.
The method and apparatus of the multi-layer image stack that provides by the embodiment of the invention carries out frame to the data that need stacking chart's layer and handles, and therefore can avoid after the image overlay may the unsharp problem of generation figure layer; And can realize the transparency of rapid adjustment video or image by adjusting overall pixel transparency value.
More than being described in detail the method and apparatus of a kind of multi-layer image stack provided by the present invention, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used to help to understand disclosed technical scheme; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. the method for multi-layer image stack is characterized in that described method comprises:
The data of obtaining the data of current layer and needing stacking chart's layer;
The described data of obtaining that need stacking chart's layer are carried out frame handle, comprising: in the size and the style that need to add frame on stacking chart's layer or adjust existing frame;
The figure layer of the needs stack of handling with current layer with through frame according to the overall pixel transparency value that is provided with carries out overlap-add procedure, the image result after obtaining superposeing.
2. the method for multi-layer image according to claim 1 stack is characterized in that, the figure layer of the described needs stack of handling with current layer with through frame according to the overall pixel transparency value that is provided with carries out overlap-add procedure and comprises:
Calculate the stack transparency value of needs stacking chart layer according to the overall pixel transparency value that is provided with;
According to the stack transparency value of described needs stacking chart layer, the figure layer of the needs stack of handling with current layer with through frame carries out overlap-add procedure, the image result after obtaining superposeing.
3. the method for multi-layer image stack according to claim 2 is characterized in that, described stack transparency value according to the overall pixel transparency value calculating needs stacking chart layer that is provided with comprises:
Obtain the pixel value of each picture element correspondence that needs stacking chart's layer;
The pixel value of each picture element correspondence of obtaining is multiplied each other with the overall pixel transparency value that is provided with respectively, needing to obtain the stack transparency value of each picture element of stacking chart's layer.
4. the method for multi-layer image stack according to claim 2, it is characterized in that, according to the stack transparency value of described needs stacking chart layer, the figure layer of the needs stack of handling with current layer with through frame carries out overlap-add procedure, and the image result after obtaining superposeing comprises:
According to the stack transparency value of described needs stacking chart layer, adopt the method for transparent stack, the image result after obtaining superposeing.
5. the method for multi-layer image stack according to claim 1 is characterized in that the described data of obtaining current layer comprise:
According to the work enabling signal, figure layer read-write control unit sends image macro data application order to figure layer input unit;
According to described image macro data application order, figure layer input unit reads the data of the image macro the current layer from external memory storage, and returns to figure layer read-write control unit.
6. the device of a multi-layer image stack is characterized in that, comprising:
The first figure layer data acquiring unit is used to obtain the data of current layer;
The second figure layer data acquiring unit is used to obtain the data that need stacking chart's layer;
The frame processing unit is used for that the described data of obtaining that need stacking chart's layer are carried out frame and handles, and is included in the size and the style that need to add frame on stacking chart's layer or adjust existing frame;
Superpositing unit, the figure layer that is used for the needs stack handled with current layer with through frame according to the overall pixel transparency value that is provided with carries out overlap-add procedure, the image result after obtaining superposeing.
7. the device of multi-layer image stack according to claim 6 is characterized in that, the device of described multi-layer image stack also comprises:
Stack transparency value unit is used for calculating the stack transparency value that needs stacking chart's layer according to the overall pixel transparency value that is provided with;
Described superpositing unit specifically is used for the stack transparency value according to described needs stacking chart layer, and the figure layer of the needs stack of handling with current layer with through frame carries out overlap-add procedure, the image result after obtaining superposeing.
8. the device of multi-layer image stack according to claim 7 is characterized in that, stack transparency value unit further comprises:
The pixel value acquiring unit is used to obtain the pixel value of each picture element correspondence that needs stacking chart's layer;
Overall situation pixel transparency value is provided with the unit, is used to be provided with overall pixel transparency value;
Computing unit, the pixel value that is used for each picture element correspondence that will obtain multiplies each other with the overall pixel transparency value that is provided with respectively, needing to obtain the stack transparency value of each picture element of stacking chart's layer.
9. the device of multi-layer image stack according to claim 6 is characterized in that, also comprises:
Output unit is used to export the image result after the resulting stack of described superpositing unit.
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