WO2011035568A1

WO2011035568A1 - Method, apparatus and set-top-box for realizing semitransparent effect on video layer for image layer

Info

Publication number: WO2011035568A1
Application number: PCT/CN2010/071183
Authority: WO
Inventors: 江峰
Original assignee: 深圳市同洲电子股份有限公司
Priority date: 2009-09-24
Filing date: 2010-03-22
Publication date: 2011-03-31
Also published as: HK1140336A1; CN101668144A; CN101668144B

Abstract

A method, apparatus and set-top-box for realizing semitransparent effect on the video layer for the image layer are provided. The method includes: acquiring a source data corresponding to every pixel point of the image to be displayed of the image layer; creating a matrix for the image to be displayed wherein the matrix includes a one to one correspondence position of the pixel points of the image to be displayed; partitioning the matrix into more than two subregions; filling the source data of corresponding pixel points in the preset positions of every subregion, and filling 0 in the other positions except for the preset positions; outputting the data of the filled matrix to the display memory for displaying.

Description

Method, device and set top box for realizing translucent effect of image layer on video layer The application is submitted to Chinese Patent Office on September 24, 2009, application number is 200910175617.6, and the invention name is "implementing image layer on translucent effect on video layer" The priority of the method, device and set top box of the Chinese patent application is hereby incorporated by reference in its entirety. Technical field

The present invention relates to the field of graphics, and in particular, to a method, apparatus and set top box for realizing translucency of an image layer on a video layer.

Background technique

In the field of computer graphics, the RGB three primary color values are generally used to define the color of each pixel, and the alpha channel value is added to represent the brightness ratio of the pixel. When the brightness ratio of the pixel is different, the pixel point can be presented. Transparency changes. The value of the above Alpha channel is between 0 and 1, 0 is completely transparent, 1 is completely opaque, and the value between 0 and 1 represents different degrees of transparency. For example, if the transparency is 5, 0 means completely transparent. 0.2 represents 20% transparency, 0.4 represents 40% transparency, and so on.

In the computer graphic display, the source data is usually read and the read source data is written into a piece of video memory, and the display device driver reads from the display memory and refreshes to the screen at intervals, and then displays the source data representative. image. The color mode of the memory is generally determined by the chip. On a 16-bit chip, 16 bits are used to define the color of one pixel, which can represent 2 ¹⁶ colors. The commonly used 16-bit color mode is ARGB1555, that is, the RGB three primary colors each occupy 5 bits, and the alpha channel value occupies 1 bit. The color mode determines the final display of the image. In AGB1555 mode, because the alpha channel value can only be represented by one bit, a pixel can only be displayed as completely transparent or completely opaque.

At present, more and more users watch digital TV programs through the set-top box, and the images viewed by the user on the screen of the TV terminal (for example, the setting menu interface called by the remote controller) are based on the principle described above, and are set in the set top box. The display device driver reads the target data from the video memory and refreshes it onto the screen of the television terminal. The color mode of the memory is also determined by the chip in the set top box. At present, low-end set-top boxes use 16-bit chips and ARGB1555 color mode to save memory and reduce computational load. The image viewed by the user on the screen of the television terminal belongs to the image layer, and the content of the television program viewed belongs to the video layer. Based on the chip of the set top box and its color mode, the image of the image layer is completely opaque, The video layer in the presence area is completely obscured, or completely transparent, that is, the user cannot see the image layer image on the screen, that is, the image layer in the set top box cannot be rendered translucent on the video layer. There is no technical solution to solve the above problems in the prior art.

Summary of the invention

The present invention provides a method for realizing a translucent effect of an image layer on a video layer. The method can be used to render a translucent effect on the video layer based on the chip of the existing set top box and its color mode.

The present invention provides an apparatus for effecting a translucent effect of an image layer on a video layer, which can be used to render a translucent effect over the video layer based on the chip of the existing set top box and its color mode.

The present invention provides a set top box comprising the above-described apparatus for effecting translucent effects of an image layer on a video layer, the set top box being capable of rendering a translucent effect over the video layer based on the existing chip and its color mode.

The technical solution of the present invention is implemented as follows:

A method for implementing a semi-transparent effect of an image layer on a video layer, the method comprising: acquiring source data corresponding to each pixel in the image to be displayed of the image layer;

Forming a matrix for the image to be displayed, the matrix including the pixel points in the image to be displayed - the corresponding position;

Dividing the matrix into two or more sub-regions;

The source data of the corresponding pixel is filled in the preset position in each sub-area, and the other position except the preset position is filled with 0;

The data in the filled matrix is output to the display memory for display.

An apparatus for implementing a semi-transparent effect of an image layer on a video layer, the device comprising: a data source management module, configured to acquire source data corresponding to each pixel in the image to be displayed of the image layer;

a first transparent processing module, configured to establish a matrix for the image to be displayed, where the matrix includes a position corresponding to a pixel point in the image to be displayed; dividing the matrix into two or more sub-regions; a processing module for each of the matrices established for the first translucent processing module The area, the preset location in the sub-area fills the source data of the corresponding pixel obtained by the data source management module, and the other locations except the preset location are filled with 0;

The display driver module is configured to output data in the matrix filled by the second translucent processing module to the display memory for display.

A set top box comprising the above apparatus for effecting a translucent effect of an image layer on a video layer, the apparatus comprising:

a data source management module, configured to acquire source data corresponding to each pixel in the image to be displayed of the image layer;

a first transparent processing module, configured to establish a matrix for the image to be displayed, where the matrix includes a position corresponding to a pixel point in the image to be displayed; dividing the matrix into two or more sub-regions; a processing module, configured to fill, for each sub-region of the matrix established by the first translucent processing module, the source data of the corresponding pixel obtained by the data source management module, and other locations than the preset location in the preset position in the sub-region Filled with 0;

It can be seen that, in the method, the device and the set top box provided by the present invention, the obtained source data is not directly output to the display memory for display, but is converted, that is, the matrix corresponding to the image to be processed is first established, and the matrix is Divided into more than two sub-areas, secondly, part of each sub-area fills the source data of the corresponding pixel, and another part of the position is filled with 0, and then the filled matrix is output to the display memory for display, where the position of the source data is filled It will eventually appear as a completely opaque image, and the position filled with 0 will eventually appear as a completely transparent image, so that the image of the image layer will appear completely opaque and completely transparent over the video layer, thus making it overall. The effect of translucent is formed, so the method of the present invention simulates the translucent effect of the image layer on the video layer. The simulation is completely based on the chip and color mode of the existing set top box, and does not require additional hardware support for the source data. The conversion is also simpler, which has less impact on the performance of the set-top box.

DRAWINGS

1 is a flowchart of a method for implementing a semi-transparent effect of an image layer on a video layer according to the present invention; FIG. 2 is a flowchart of a method for dividing a sub-area in the flow shown in FIG. 3 is a flow chart of a method for filling source data in each sub-area in the flow shown in FIG. 1. FIG. 4 is a schematic structural diagram of an apparatus for implementing a translucent effect of an image layer on a video layer according to the present invention. detailed description

In order to make the objects and advantages of the present invention more comprehensible, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

FIG. 1 is a flowchart of a method for implementing a translucent effect of an image layer on a video layer according to the present invention, the process including:

Step 101: Acquire source data corresponding to each pixel in the image layer to be displayed.

Step 102: Establish a matrix for the image to be displayed, where the matrix includes a position corresponding to a pixel point in the image to be displayed.

Step 103: Divide the matrix into two or more sub-regions.

Step 104: Fill a part of each sub-area with source data of the corresponding pixel and another part of the position with 0.

Step 105: Output the data in the filled matrix to the display memory for display.

It can be seen from the flow shown in FIG. 1 that the method provided by the present invention does not directly output the acquired source data to the display memory for display, but performs conversion processing, that is, first establishes a matrix corresponding to the image to be processed, and The matrix is divided into two or more sub-regions, and then a part of each sub-region is filled with source data of the corresponding pixel, and another portion is filled with 0, and then the filled matrix is output to the display memory for display, wherein the padding is source data. The position will eventually appear as a completely opaque image, and the position filled with 0 will eventually appear as a completely transparent image, so that the image of the image layer will appear completely opaque and completely transparent over the video layer. Thereby forming a translucent effect on the whole, the method of the present invention simulates the effect of the image layer being translucent over the video layer. The simulation is based entirely on the chip and color mode of the existing set top box, and does not require additional hardware support. The conversion of source data is also simpler, which has less impact on the performance of the set-top box.

An embodiment of the method of the present invention is shown below, with detailed implementations of the various steps shown in Figure 1, respectively.

1. For step 101 shown in FIG. 1, after receiving the display instruction input by the user, the graphics engine is used to place the source data corresponding to each pixel in the image to be displayed in the cache to form a The data set, the source data in the data set conforms to the color mode ARGB1555 of the chip in the set top box. As for how to use the graphics engine to put the source data into the cache, it is common knowledge in the art, and will not be described here.

2. For step 102 shown in Fig. 1, each position in the established matrix includes 4 data bits conforming to the color mode ARGB1555, of which 3 bits are used to fill the RGB three primary colors and 1 bit is used to fill the alpha channel values.

3. The step 103 shown in FIG. 1 can be implemented by the process shown in FIG. 2, and the process includes:

Step 201: Obtain the number of bits n of the preset alpha channel value.

In this step, the number n of the alpha channel value is preset by the designer in the product, and the value is related to the transparency level. For example, when n is 2, the simulation supports 2"=4 level transparency, that is, the simulation display effect is supported. It is completely opaque, 25% transparent, 50% transparent, 75% transparent and completely transparent. For ease of processing, n is set to an integral multiple of 2.

Step 202: Determine whether the established matrix can be divided into an integer number of identical sub-areas, if yes, execute step 204, otherwise perform step 203.

In this step, since the position in the established matrix is in one-to-one correspondence with the pixels in the image to be displayed, the width and height of the image to be displayed are the width and height of the matrix, and the image to be displayed can be obtained by the application. Wide and high values.

In this step, the width of the established matrix is w and the height is h. For the convenience of processing, it is assumed that each sub-area is a square with a width and a height of 2" ^/2 , so that it is only necessary to judge whether the established matrix is judged during judgment. Can be divided [2 called x[A/2 called sub-area, if it is divided into integer sub-areas.

Step 203: Add a position in the matrix to be divided into an integer number of identical sub-areas; and perform step 204.

In this step, the matrix established for the image to be processed cannot be divided into an integer number of sub-regions. For example, if each sub-region is a square of _4×4 and the established matrix is a matrix of 16×19, the position in the matrix needs to be increased first, for example, forming a 16×20 The matrix can guarantee that the matrix can divide an integer number of 4x4 squares.

Step 204: Set the width and height of each sub-area to be 2" ^/2 . Through the above steps 201 to 204, the established matrix can be divided into two or more sub-regions. 4. The step 104 shown in FIG. 1 can be implemented by the process shown in FIG. 3, where the process includes:

Step 301: Obtain the transparency value set by the user, a, and take [0, 1].

In this step, the transparency value a includes: a global transparency value al and a local transparency value a2. The global transparency value a1 is for the overall transparency effect of the image to be displayed. Taking the number of bits n of the supported alpha channel value as 2, the global transparency a can be taken as 0, 0.25, 0.5, 0.75 or 1; the local transparency value a2 For the transparent effect of the local area specified in the graphic to be displayed set by the user, taking the number of bits n of the alpha channel value as 2, the local transparency value a2 may also be taken as 0, 0.25, 0.5, 0.75 or 1.

In the embodiment of the present invention, the user may set the local area in the image to be displayed and specify the transparency effect of the local area to be different from the overall transparency effect of the image to be displayed, thereby giving the user a different experience, but in some applications, , you can also have only global transparency values.

Step 302: Convert the obtained transparency value, and the converted value is identified by A.

In this step, for each sub-area, the transparency value is converted according to the formula A = _β χ 2", and when a certain sub-area is divided into only the user-specified local area, a in the formula takes the global transparency value al and The product of the local transparency value a2, that is, the two values are superimposed. When a certain sub-region is divided into a user-specified local region and other parts of the image to be displayed, a in the formula takes global transparency. The value is al.

Determining whether a divided sub-area contains a user-specified local area may first obtain an initial coordinate value of the image to be processed and the local area on the screen by the application, and a value of the width and height of the local area, due to the established The position in the matrix corresponds to the pixel point in the image to be processed, so that the obtained starting coordinate value can be used to determine where the local region starts in the matrix, and how much the size is, thereby determining the local region distribution. In which sub-areas.

The value obtained according to the above formula may not necessarily be an integer. When the value obtained is not an integer, the method of rounding is approximated to an integer.

Step 303: Number each location in each sub-area in a predetermined order.

In this step, the predetermined order is: the position of the upper left corner in each sub-area is taken as the starting position. Follow the order from left to right and top to bottom.

An example of the numbering of a 4x4 sub-area is shown in Table 1.

Table 1

The above is only a specific example. In other applications, other predetermined orders can be set.

5 Order, for example, starting from the position of the upper left corner in each sub-area and numbering them in the direction of the diagonal to form an example numbered as shown in Table 2.

Table 2

Step 304: When the position in the matrix is not added in the process of dividing the sub-area, for each sub-area, the source data of the corresponding pixel is filled in the positions before the numbers A and A, and the position 0 after the number A is filled with 0; When the position in the matrix is added in the process of dividing the sub-area, for each sub-area, the source data of the corresponding pixel is filled in the positions before the number A and A, and does not belong to the increased position, after the number A, and belongs to the increased position. Filled with 0.

In this step, if the position in the matrix is added in the process of dividing the sub-area, the added part does not belong to the image to be displayed in the image layer, but is additionally added for the convenience of dividing the sub-area, and this part cannot be finally displayed in the end. On the screen, therefore, when filling the position in each sub-area, if it encounters the increased position, it needs to be filled with 0, in order to completely increase the part of the final display when it is completely transparent, so that no additional part is seen.

The filling of data in each sub-area is completed by the above steps 301 to 304. Take the sub-area shown in Table 1 as an example. The sub-area does not include the added position in the matrix, and does not include the user-specified area»0 area. Assume that the number of bits of the alpha channel value is n, and the global transparency value is 0.5, then Table 1 The positions numbered 1 to 8 are filled with the corresponding source data, and the positions numbered 9 to 16 are respectively filled with 0, and the filled sub-region is as shown in Table 3.

table 3

5. For step 105 shown in Figure 1, the display device driver invokes the drive interface of the set top box platform, writes the filled data to the specified memory address, and then performs the display in a conventional manner.

Based on the method provided by the present invention, the present invention also provides an apparatus for implementing the method, and FIG. 5 is a schematic structural diagram of an apparatus for implementing a translucent effect of an image layer on a video layer, the apparatus comprising: a data source management module 410, a first translucent processing module 420, a second translucent processing module 430, and a display driving module 440.

The data source management module 410 is configured to acquire source data corresponding to each pixel in the image to be displayed of the image layer.

The first translucent processing module 420 is configured to establish a matrix for the image to be displayed, where the matrix includes a position corresponding to a pixel point in the image to be displayed; and divide the matrix into two or more sub-regions.

The second semi-transparent processing module 430 is configured to fill, for each sub-region of the matrix established by the first translucent processing module 420, the source data of the corresponding pixel obtained by the data source management module 410 in a part of the sub-region, and another Part of the location is filled with 0.

The display driving module 440 is configured to output the data in the matrix filled by the second translucent processing module 430 to the display memory for display.

In order to implement the divided sub-area described in the method of the present invention, the first translucent processing module 420 includes: a matrix establishing unit 4201, a first obtaining unit 4202, and a determining unit 4203.

The first obtaining unit 4202 is configured to acquire the number of bits n of the preset alpha channel value.

The matrix establishing unit 4201 is configured to establish a matrix for the image to be displayed, where the matrix includes a position corresponding to a pixel point in the image to be displayed; and when the output of the determining unit 4203 is YES As a result, two or more sub-regions each having a width and a height of 2" ^/2 are divided in the matrix. When the judgment unit 4203 outputs a judgment result of No, the position in the matrix is first increased so that it can be set [matrix width / 2" ^/2 ] X [matrix height / 2" ^/2 ] sub-regions, and then divide the matrix after the position is increased by two or more sub-regions whose width and height are both 2" ^/2 .

The determining unit 4203 is configured to determine whether the matrix established by the matrix establishing unit 4201 can be divided into [matrix width / 2" ^/2 ] X [matrix height / 2" ^/2 ] sub-regions, and output the determination result to the matrix establishing unit 4201 .

To implement the padding described in the method of the present invention, the second translucent processing module 430 includes: a second obtaining unit 4301, a converting unit 4302, a numbering unit 4303, and a filling unit 4304.

The second obtaining unit 4301 is configured to obtain a transparency value a, a of the user setting, and [0, 1]. The conversion unit 4302 is configured to convert the transparency value according to the formula Α = _α χ 2".

The above numbering unit 4303 is for a position number in each sub-area divided by the matrix establishing unit 4201 in a predetermined order.

The filling unit 4304 is configured to: when the first translucent processing module 420 does not increase the position in the matrix, fill each source region divided by the matrix establishing unit 4201, and fill the source data of the corresponding pixel point at positions before the numbers Α and Α Filling the position after the number A; when the first translucent processing module 420 increases the position in the matrix, each sub-area divided for the matrix establishing unit 4201, before the numbers A and A, does not belong to the addition The position fills the source data of the corresponding pixel, and is padded after the number A and the position belonging to the increment.

The foregoing apparatus provided by the present invention can perform operations according to the method flow provided by the present invention, and details are not described herein again.

The present invention also provides a set top box including the above device for realizing a translucent effect of an image layer on a video layer, so that the set top box can render a translucent image layer on top of the video layer based on the existing chip and its color mode. The specific structure of the device is the same as that described above, and will not be described again here.

In conclusion, the above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request

A method for implementing a translucent effect of an image layer on a video layer, the method comprising:

Obtaining source data corresponding to each pixel point in the image to be displayed of the image layer;

5 establishing a matrix for the image to be displayed, the matrix including the pixel points in the image to be displayed - the corresponding position;

Dividing the matrix into two or more sub-regions;

^ 0 Outputs the data in the filled matrix to the display memory for display.

2. The method according to claim 1, wherein the dividing the matrix into two or more sub-regions comprises:

Get the number of bits of the preset alpha channel value n;

It is judged whether the matrix can be divided into [matrix width / 2" ^/2 ] X [matrix height / 2" ^/2 ] sub-regions, and if so, two or more widths and heights of 2" ^/2 are divided in the matrix Sub-region; otherwise, first increase the position in the matrix so that it can be divided into [matrix width / 2" ^/2 ] X [matrix height / 2" ^/2 ] sub-regions, and then divide in the matrix after increasing the position Both the width and height are two or more sub-areas of 2" ^/2 .

The method according to claim 2, wherein the filling of the source data of the corresponding pixel in the preset position in each sub-area and the filling of the position other than the preset position comprises:

»0 Get the transparency value set by the user a, the transparency value a is greater than or equal to 0, less than or equal to 1;

Convert the transparency value according to the formula A = αχ2";

Number each location in each sub-area in a predetermined order;

When the position is not added to the matrix in the division, for each sub-area, the corresponding source data is filled at positions before the numbers Α and A, and the position after the number A is filled with 0; when the division is at »5 When the position is added to the matrix, for each sub-area, the corresponding source data is filled before the numbers A and A, and the positions that are not added, and 0 is added after the number A and the position that belongs to the increase.

4. The method according to claim 3, wherein the predetermined order is: starting from a position in the upper left corner of each sub-area, in order from left to right and top to bottom.

The method of claim 3, wherein before the obtaining the transparency value set by the user, the method further comprises: pre-specifying the local area in the image to be displayed;

Correspondingly, the transparency value a includes: a global transparency value al for the image to be displayed, and a local transparency value a2 for the local region;

The conversion of the transparency value according to the formula Α = _β χ 2" includes: for each sub-region, when only the local region is included in the sub-region, the value of a in the formula Α = _α χ 2" takes the global transparency value a1 a product of the local transparency value a2; when the sub-region contains both the local region and the portion of the image to be displayed, the value of a in the formula Α = _α χ 2" takes the global transparency value a1; When only the portion of the image to be displayed is included, the value of a in the formula Α = _α χ 2" takes the global transparency value a1.

6. A device for implementing a translucent effect of an image layer on a video layer, the device comprising:

7. The apparatus according to claim 6, wherein the first translucent processing module comprises:

a first obtaining unit, configured to obtain a number n of preset alpha channel values;

a matrix establishing unit, configured to establish a matrix for the image to be displayed, where the matrix includes a position one-to-one corresponding to the pixel points in the image to be displayed; when the judgment result output by the determining unit is yes, the width and height are divided in the matrix For two or more sub-areas of 2" ^/2 , when the judgment result of the judgment unit output is no, first increase the position in the matrix so that it can set [matrix width / 2" ^/2 ] X [matrix height / 2" ^/2 ] sub-regions, and then divide more than two sub-regions whose width and height are 2" ^/2 in the matrix after the position is increased; The judging unit is configured to judge whether the matrix established by the matrix establishing unit can be divided into [matrix width / 2" ^/2 ] X [matrix height / 2" ^/2 ] sub-regions, and output the judgment result to the matrix establishing unit.

8. The apparatus of claim 7, wherein the second translucent processing module comprises:

a second obtaining unit, configured to obtain a transparency value a set by the user, where the transparency value a is greater than 0, less than or equal to 1;

a conversion unit for converting the transparency value according to the formula Α = _β χ 2";

a numbering unit for establishing a position number in each sub-area divided by the unit for the matrix in a predetermined order;

0 padding unit, used to fill the source data of the corresponding pixel point at the position before the number Α and 每个, when the first translucent processing module does not increase the position in the matrix, and fill in the source data of the corresponding pixel point at the position before the number Α and , The position after A is padded with 0; when the first translucent processing module increases the position in the matrix, each sub-region divided for the matrix establishment unit is filled with corresponding pixels before the numbers A and A, and not belonging to the added position. Source data, padded with 0 after number A, and belonging to the added position.

9. A set top box, comprising: means for effecting a translucent effect of an image layer on a video layer, the apparatus comprising:

The first half transparent processing module is configured to establish a matrix for the image to be displayed, where the matrix includes a position corresponding to a pixel point in the image to be displayed; dividing the matrix into two or more sub-regions; a semi-transparent processing module, configured to fill each sub-region of the matrix established by the first translucent processing module, and fill the source data of the corresponding pixel obtained by the data source management module and the preset position in the preset position in the sub-region Other positions are filled with 0;

The display driver module is configured to output the data in the matrix filled by the second translucent processing module to the display memory for display.

The set top box according to claim 9, wherein the first translucent processing module comprises: a first obtaining unit, configured to obtain a bit number n of the preset alpha channel value;

a matrix establishing unit, configured to establish a matrix for the image to be displayed, where the matrix includes a position one-to-one corresponding to the pixel points in the image to be displayed; when the judgment result output by the determining unit is yes, the width and height are divided in the matrix For two or more sub-areas of 2" ^/2 , when the judgment result of the judgment unit output is No, 5 first increase the position in the matrix so that it can set [matrix width / 2" ^/2 ] X [matrix height / 2 " ^/2 ] sub-regions, and then divide two or more sub-regions whose width and height are both 2" ^/2 in the matrix after the position is increased;

The judging unit is configured to judge whether the matrix established by the matrix establishing unit can be divided into [matrix width / 2" ^/2 ] X [matrix height / 2" ^/2 ] sub-regions, and output the judgment result to the matrix establishing unit.

The set top box according to claim 10, wherein the second translucent processing module 0 comprises:

a second obtaining unit, configured to obtain a transparency value _a set by the user, where the transparency value a is greater than or equal to 0 and less than or equal to 1;

a numbering unit for locating a position ^5 in each sub-area of the unit division in a predetermined order;

a padding unit, configured to: when the first translucent processing module does not increase the position in the matrix, fill each of the sub-areas divided by the matrix establishment unit, and fill the source data of the corresponding pixel point at a position before the numbers Α and ,, at number A. The subsequent position is filled with 0; when the first translucent processing module increases the position in the matrix, each sub-region divided for the matrix establishment unit is filled with corresponding pixels before the numbers A and A, and not »0 belongs to the increased position The source data of the point, padded with 0 after the number A and belonging to the added position.