CN103179452B - Video broadcasting method in IMS system, home gateway device and system - Google Patents
Video broadcasting method in IMS system, home gateway device and system Download PDFInfo
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- CN103179452B CN103179452B CN201110433041.6A CN201110433041A CN103179452B CN 103179452 B CN103179452 B CN 103179452B CN 201110433041 A CN201110433041 A CN 201110433041A CN 103179452 B CN103179452 B CN 103179452B
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Abstract
The invention provides the video broadcasting method in a kind of IMS system, comprise: the current frame image data of receiver, video image, according to the current frame image data of reception and the resolution of display screen, determine the gray value of each pixel on display screen, send to described display screen to display the play the gray value of each pixel determined.Present invention also offers a kind of home gateway device and audio/video player system.Application the present invention, can improve the definition of image display.
Description
Technical field
The present invention relates to image communication technology, video broadcasting method, home gateway device and system particularly in a kind of IMS system.
Background technology
Based on the video service system of IMS network structure as shown in Figure 1, this system comprises Video service main control server, home gateway, these three key network element units of television terminal.Wherein, multimedia IVR platform, i.e. Video service main control server, be responsible for receiving user 2G call request, pushing video content is to home gateway; Home gateway is responsible for the video content that receiver, video service main control server is transferred to, and is connected, by code conversion, video content is transferred to television terminal with television terminal; Television terminal is used for representing video content.
In the system configuration shown in Fig. 1, the video content being pushed to user terminal by Video service main control server is through compression coding, in order to save network bandwidth resources, the video content file pixel value stored in the server is lower, if directly push to mobile phone terminal, then can not produce direct not fogging clear problem because mobile phone terminal screen is less, if push to the television terminal of user, then there will be problem.Television terminal screen size is large, if directly video file is pushed to television terminal, after screen magnifying, user cannot watch video content clearly.
Summary of the invention
The invention provides video broadcasting method, home gateway device and the system in a kind of IMS system, the definition of image display can be improved on large scale screen.
For achieving the above object, the present invention adopts following technical scheme:
A video broadcasting method in IMS system, comprising:
The current frame image data of receiver, video image, according to the current frame image data of reception and the resolution of display screen, determine the gray value of each pixel on display screen, send to described display screen to display the play the gray value of each pixel determined.
Preferably, describedly determine that the gray value of each pixel on display screen is:
Calculate the gray value of each pixel in the current frame image received, and need the multiple N of expansion according to the resolution of display screen and the current frame image data determination current frame image of reception;
By pixel based on four, the center pixel of the current frame image of reception, by four pixels at the gray value of four described basic pixel points correspondence write display screen center; Centered by described four basic pixel points, display screen and current frame image are divided into four quadrants separately, each quadrant comprises one in described four basic pixel points;
In each quadrant, by current frame image arbitrary coordinate in this quadrant be (x ', y ') pixel gray value write display screen on coordinate be on the pixel of [(x-(x-x ') * N), (y-(y-y ') * N)]; According to the gray value having write any two neighbor pixels of gray value current on display screen, obtained the gray value of other each blank pixel points between described any two neighbor pixels by interpolation; Described two neighbor pixels are, only comprise describedly currently having write two pixels adjacent in the set of all pixels of gray value; (x, y) is the coordinate of basic pixel point in described quadrant.
Preferably, linear interpolation is inserted as in described.
Preferably, the described mode obtaining other each blank pixel point gray values between described any two neighbor pixels by linear interpolation is:
By coordinate be
the gray value of pixel is set to
wherein, (x
1, y
1) and (x
2, y
2) be the coordinate of described any two neighbor pixels, the gray value that F () is pixel, n=1,2 ..., N.
Preferably, the gray value of described calculating pixel point is: F (x, y)=0.3xR (x, y)+0.59xG (x, y)+0.11xB (x, y), wherein R (x, y)=red color component value, G (x, y)=green component values, B (x, y)=blue color component value.
A home gateway device in IMS system, comprising: receiving element and processing unit;
Described receiving element, for the current frame image data of receiver, video image;
Described processing unit, for the resolution according to the current frame image data received and display screen, determines the gray value of each pixel on display screen, sends to described display screen to display the play the gray value of each pixel determined.
Preferably, described processing unit comprises expansion multiple computation subunit and gray value computation subunit;
Described expansion multiple computation subunit, for calculate reception current frame image in the gray value of each pixel, and need the multiple N that expands according to the resolution of display screen and the current frame image data determination current frame image of reception;
Described gray value computation subunit, for will receive current frame image four, center pixel based on pixel, by the gray value of four described basic pixel points correspondence write display screen center four pixels on; Centered by described four basic pixel points, display screen and current frame image are divided into four quadrants separately, each quadrant comprises one in described four basic pixel points; In each quadrant, by current frame image arbitrary coordinate in this quadrant be (x ', y ') pixel gray value write display screen on coordinate be on the pixel of [(x-(x-x ') * N), (y-(y-y ') * N)]; According to the gray value having write any two neighbor pixels of gray value current on display screen, obtained the gray value of other each blank pixel points between described any two neighbor pixels by interpolation; Described two neighbor pixels are, only comprise describedly currently having write two pixels adjacent in the set of all pixels of gray value; (x, y) is the coordinate of basic pixel point in described quadrant.
Preferably, described gray value computation subunit, when carrying out interpolating operations, by coordinate is
the gray value of pixel is set to
wherein, (x
1, y
1) and (x
2, y
2) be the coordinate of described any two neighbor pixels, the gray value that F () is pixel, n=1,2 ..., N.
A kind of audio/video player system, comprising: video main control server, home gateway device and television terminal;
Described video main control server, for sending to described home gateway device by the current frame image data of video image;
Described home gateway device, for the current frame image data of receiver, video image, and according to the current frame image data of reception and the resolution of described television terminal display screen, determine the gray value of each pixel on described television terminal display screen, the gray value of each pixel determined is sent to described television terminal;
Described television terminal, the gray value for each pixel sent according to home gateway device carries out image display.
Preferably, described home gateway device, when calculating the gray value of each pixel, calculate the gray value of each pixel in the current frame image received, and need the multiple N of expansion according to the resolution of display screen and the current frame image data determination current frame image of reception; By pixel based on four, the center pixel of the current frame image of reception, by four pixels at the gray value of four described basic pixel points correspondence write display screen center; Centered by described four basic pixel points, display screen and current frame image are divided into four quadrants separately, each quadrant comprises one in described four basic pixel points; In each quadrant, by current frame image arbitrary coordinate in this quadrant be (x ', y ') pixel gray value write display screen on coordinate be on the pixel of [(x-(x-x ') * N), (y-(y-y ') * N)]; According to the gray value having write any two neighbor pixels of gray value current on display screen, obtained the gray value of other each blank pixel points between described any two neighbor pixels by interpolation; Described two neighbor pixels are, only comprise describedly currently having write two pixels adjacent in the set of all pixels of gray value; (x, y) is the coordinate of basic pixel point in described quadrant.
Preferably, described home gateway device, when carrying out interpolating operations, by coordinate is
the gray value of pixel is set to
wherein, (x
1, y
1) and (x
2, y
2) be the coordinate of described any two neighbor pixels, the gray value that F () is pixel, n=1,2 ..., N.
As seen from the above technical solution, in the present invention, the current frame image data of receiver, video image, according to the current frame image data of reception and the resolution of display screen, determine the gray value of each pixel on display screen, send to display screen to display the play the gray value of each pixel determined.By above-mentioned process, home gateway is further processed the view data received, and according to the resolution of display screen and the view data of reception, obtains the gray value of each pixel on display screen, thus improves the definition of image display.
Further, when calculating pixel point gray value, first calculate the gray value of each pixel in the current frame image of reception, and computed image needs the multiple N of expansion; Then, by pixel based on four of picture centre points, centered by four basic pixel points, current frame image and display screen are all divided into four quadrants, each quadrant comprises one in four basic pixel points.According to N, current frame image geometric ratio is amplified, then will amplify on pixel corresponding on the gray value write display screen of rear pixel.Finally process respectively in each quadrant: for any two neighbor pixels having write gray value in quadrant, between these two pixels, other do not write the gray value of the blank pixel point of gray value to utilize interpolating method to determine.By the way, the definition of image display can be improved on large scale display screen.
Accompanying drawing explanation
Fig. 1 is the video service system structural representation of IMS network;
Fig. 2 is the particular flow sheet of method for displaying image in the present invention;
Fig. 3 is that pixel step-length increases schematic diagram;
Fig. 4 is the schematic diagram of pixel gray value write on display screen;
Fig. 5 is the schematic flow sheet applying the inventive method in IMS network video service system;
Fig. 6 is the concrete structure schematic diagram of audio/video player system in the present invention;
Fig. 7 is the concrete structure schematic diagram of home gateway device in the present invention.
Embodiment
For making object of the present invention, technological means and advantage clearly understand, below in conjunction with accompanying drawing, the present invention is described in further details.
In the present invention, when carrying out the broadcasting of IMS system video, the current frame image data of receiver, video image, according to the current frame image data of reception and the resolution of display screen, determine the gray value of each pixel on display screen, send to described display screen to display the play the gray value of each pixel determined.By above-mentioned process, after home gateway device receives view data, not be pushed directly on television terminal, but according to the data of reception and the resolution of television terminal display screen, calculate the gray value of each pixel on display screen, thus each pixel shows corresponding gray value on the display screen, improve the definition of image display.Below by specific embodiment, specific implementation of the present invention is described.
Fig. 2 is the schematic flow sheet of method for displaying image in the embodiment of the present invention.As shown in Figure 2, the method comprises:
Step 201, receives current frame image data, and calculates the gray value of each pixel.
In the view data received, each pixel comprises three component datas: red color component value, green component values and blue color component value.The gray value of pixel can be calculated according to these three component values, by when the view data of reception write large scale display screen shows, can directly the gray value of pixel be write direct on respective pixel point.
The mode of concrete calculating gray value is: F (a, b)=0.3xR (a, b)+0.59xG (a, b)+0.11xB (a, b), wherein R (a, b)=red color component value, G (a, b)=green component values, B (a, b)=blue color component value.The coordinate of each pixel in the current frame image that (a, b) is reception.
Step 202, needs the multiple N expanded according to the resolution of display screen and the current frame image data determination current frame image of reception.
After a two field picture renders to large scale display screen, X, Y step-length that each pixel covers increases, shown in schematic diagram Fig. 3.What provide in Fig. 3 is the signal of amplifying twice.Specifically in actual applications, need to determine N according to the resolution of display screen and the current frame image data of reception, concrete account form belongs to the conventional means of those skilled in the art, just repeats no more here.
Because picture size is extended N times, if directly by the Nonlinear magnify of display, will cause not fogging clear, need all pixels gray value separately on correct calculating display screen, the image resolution ratio of display and the resolution of display screen are consistent, improve image definition.
Viewing according to spectators is accustomed to, and when picture size changes, usually should ensure the consistent of center picture.Based on this, in the present invention, when carrying out pixel gray value and calculating, take image center as benchmark, image slices vegetarian refreshments is amplified to surrounding diffusion.Concrete process is as follows:
Step 203, by pixel based on four, the center pixel of the current frame image of reception, by four pixels at the gray value of four basic pixel points correspondence write display screen center; Centered by four basic pixel points, display screen and current frame image are divided into four quadrants separately, each quadrant comprises one in described four basic pixel points.
In this step, pixel, i.e. A1, A2, A3 and A4 based on four pixels determining picture centre.By on four pixels at the gray value of these four basic pixel points correspondence write display screen center.
On current frame image, centered by four basic pixel points, current frame image is divided into four quadrants, namely with horizontal and vertical center line, image is divided into four quadrants, each quadrant comprises a basic pixel point.
On the display screen, centered by four, center pixel (also referred to as basic pixel point), display screen is divided into four quadrants, namely with horizontal and vertical center line, image is divided into four quadrants, each quadrant comprises a basic pixel point.
Pass through aforesaid operations, current frame image and display screen are divided into four quadrants separately, and quadrant identical with position in display screen for current frame image is carried out correspondence, according to direction, the quadrant in the upper right corner is called first quartile, the quadrant in the upper left corner is called the second quadrant, the quadrant in the lower left corner is called third quadrant, the quadrant in the lower right corner is called fourth quadrant.Two first quartiles of current frame image and display screen are mutually corresponding, and two the second quadrants are mutually corresponding, and two third quadrants are mutually corresponding, and two fourth quadrants are mutually corresponding.
Step 204, writes each pixel gray value in the current frame image received on the appropriate location of display screen.
Particularly, the process in each quadrant is identical, is described here for first quartile.
With the basic pixel point in first quartile for benchmark, successively by current frame image other pixels in first quartile, a gray value is write at interval of N number of blank pixel point in the first quartile of display screen, by current frame image arbitrary coordinate in this quadrant be (x ', y ') pixel gray value write display screen on coordinate be [(x-(x-x ') * N), (y-(y-y ') * N)] pixel on, wherein, (x, y) is the coordinate of basic pixel point in first quartile.After such process, in the first quartile of display screen, between the pixel of every two write gray values, there is the blank pixel point that N-1 does not write gray value.As shown in Figure 4, solid pixel represents the pixel writing gray value, and hollow pixel represents the blank pixel point not writing gray value.
After the process of this step, the gray value correspondence of all pixels in the current frame image received is write the appropriate location of display screen.At this moment, on display screen, every N-1 blank pixel point, a pixel having write gray value is had.
Step 205, calculates the gray value of blank pixel point by interpolation.
As mentioned above, after step 204, every two exist multiple blank pixel point at a distance of between the nearest pixel writing gray value on the display screen, this step is for calculating the gray value of these blank pixel points, thus make all pixels on whole display screen all write gray value, to make the picture material of whole display fuller.
Particularly, the process in each quadrant is identical, is still described for first quartile here.
In the first quartile of display screen, for every two nearest pixels writing gray value, according to the gray value of these two pixels, obtained the gray value of other each blank pixel points between these two pixels by interpolation.The mode of concrete interpolation can adopt existing various mode, the most simply, can utilize the mode of linear interpolation, also compare the feature meeting image procossing.
Specifically when carrying out linear interpolation, by coordinate be
the gray value of pixel is set to
wherein, (x
1, y
1) and (x
2, y
2) write the pixel coordinate of gray value, the gray value that F () is pixel, n=1,2 for nearest two ..., N.
Here two nearest pixels are explained, namely write on the pixel line direction of gray value at any two, nearest two pixels having write gray value, as shown in Figure 4, for pixel A, the pixel nearest with it comprises: B, C, D, E, F, G, H, I.Or also can understand like this: all pixels having write gray value are added a set, in this set X, adjacent pixel and nearest two pixels of afore-mentioned distance, but here, adjacent refer to set X in adjacent, be not adjacent on the display screen.
By the process of this step, utilize interpolation method to obtain the gray value of blank pixel point, thus the gray value of whole image is seamlessly transitted, make image seem more level and smooth.Meanwhile, because the display resolution of image and the physical resolution of display screen are consistent, thus the definition of image display can be improved.
So far, the method flow in the present invention terminates.
Flow process when above-mentioned method for displaying image of the present invention is applied in the video service system of IMS network is as shown in Figure 5:
1, user makes a call to platform;
2, platform is connected, and providing to user can options;
3, user's selecting video service;
4, platform initiates a call to home gateway;
5, home gateway starts after receiving Inbound, connects video terminal;
6, home gateway obtains video terminal screen size, forms grid, prepares to calculate;
7, home gateway AnswerCall;
8, platform send audio frequency to user's thruster, to home gateway pushing video stream;
9, home gateway receives video data, and framing carries out grey scale pixel value calculating by the method shown in Fig. 2, pushes to video terminal;
10, user terminal and video terminal complete audio frequency and video by platform and work in coordination with.
By process of the present invention, the definition of image display can be improved, when the image resolution ratio transmitted is less than the resolution of display screen, still can ensure the definition that image shows.
Present invention also offers the home gateway device for implementing the invention described above method and audio/video player system.Fig. 6 is the concrete structure schematic diagram of audio/video player system in the present invention, and Fig. 7 is the concrete structure schematic diagram of home gateway device in the present invention.
As shown in Figure 6, system comprises: video main control server, home gateway device and television terminal.Wherein, video main control server, for sending to described home gateway device by the current frame image data of video image; Home gateway device, for the current frame image data of receiver, video image, and according to the current frame image data of reception and the resolution of described television terminal display screen, determine the gray value of each pixel on described television terminal display screen, the gray value of each pixel determined is sent to described television terminal; Television terminal, the gray value for each pixel sent according to home gateway device carries out image display.
As shown in Figure 7, the home gateway device in the present invention comprises receiving element and processing unit.Wherein, receiving element, for the current frame image data of receiver, video image.Processing unit, for the resolution according to the current frame image data received and display screen, determines the gray value of each pixel on display screen, sends to display screen to display the play the gray value of each pixel determined.
Wherein, preferably, processing unit can comprise expansion multiple computation subunit and gray value computation subunit.Wherein, expand multiple computation subunit, for calculate reception current frame image in the gray value of each pixel, and need the multiple N that expands according to the resolution of display screen and the current frame image data determination current frame image of reception.Gray value computation subunit, for will receive current frame image four, center pixel based on pixel, by the gray value of four described basic pixel points correspondence write display screen center four pixels on; Centered by described four basic pixel points, display screen and current frame image are divided into four quadrants separately, each quadrant comprises one in described four basic pixel points; In each quadrant, by current frame image arbitrary coordinate in this quadrant be (x ', y ') pixel gray value write display screen on coordinate be on the pixel of [(x-(x-x ') * N), (y-(y-y ') * N)]; According to the gray value having write any two neighbor pixels of gray value current on display screen, obtained the gray value of other each blank pixel points between described any two neighbor pixels by interpolation; Described two neighbor pixels are, only comprise describedly currently having write two pixels adjacent in the set of all pixels of gray value; (x, y) is the coordinate of basic pixel point in described quadrant.
Further, gray value computation subunit, when carrying out interpolating operations, preferably, can be by coordinate
the gray value of pixel is set to
wherein, (x
1, y
1) and (x
2, y
2) be the coordinate of described any two neighbor pixels, the gray value that F () is pixel, n=1,2 ..., N.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. the video broadcasting method in IMS system, it is characterized in that, the method comprises:
The current frame image data of receiver, video image, according to the current frame image data of reception and the resolution of display screen, determine the gray value of each pixel on display screen, send to described display screen to display the play the gray value of each pixel determined;
Wherein, describedly determine that the gray value of each pixel on display screen is:
Calculate the gray value of each pixel in the current frame image received, and need the multiple N of expansion according to the resolution of display screen and the current frame image data determination current frame image of reception;
By pixel based on four, the center pixel of the current frame image of reception, by four pixels at the gray value of four described basic pixel points correspondence write display screen center; Centered by described four basic pixel points, display screen and current frame image are divided into four quadrants separately, each quadrant comprises one in described four basic pixel points;
In each quadrant, be (x' by current frame image arbitrary coordinate in this quadrant, y') on pixel gray value write display screen, coordinate is on the pixel of [(x-(x-x') * N), (y-(y-y') * N)]; According to the gray value having write any two neighbor pixels of gray value current on display screen, obtained the gray value of other each blank pixel points between described any two neighbor pixels by interpolation; Described two neighbor pixels are, only comprise describedly currently having write two pixels adjacent in the set of all pixels of gray value; (x, y) is the coordinate of basic pixel point in described quadrant.
2. method according to claim 1, is characterized in that, is inserted as linear interpolation in described.
3. method according to claim 2, is characterized in that, the described mode obtaining other each blank pixel point gray values between described any two neighbor pixels by linear interpolation is:
By coordinate be
the gray value of pixel is set to
wherein, (x
1, y
1) and (x
2, y
2) be the coordinate of described any two neighbor pixels, the gray value that F () is pixel, n=1,2 ..., N.
4. according to described method arbitrary in Claim 1-3, it is characterized in that, the gray value of described calculating pixel point is: F (x, y)=0.3xR (x, y)+0.59xG (x, y)+0.11xB (x, y), wherein R (x, y)=red color component value, G (x, y)=green component values, B (x, y)=blue color component value.
5. the home gateway device in IMS system, is characterized in that, this device comprises: receiving element and processing unit;
Described receiving element, for the current frame image data of receiver, video image;
Described processing unit, for the resolution according to the current frame image data received and display screen, determines the gray value of each pixel on display screen, sends to described display screen to display the play the gray value of each pixel determined;
Wherein, described processing unit comprises expansion multiple computation subunit and gray value computation subunit;
Described expansion multiple computation subunit, for calculate reception current frame image in the gray value of each pixel, and need the multiple N that expands according to the resolution of display screen and the current frame image data determination current frame image of reception;
Described gray value computation subunit, for will receive current frame image four, center pixel based on pixel, by the gray value of four described basic pixel points correspondence write display screen center four pixels on; Centered by described four basic pixel points, display screen and current frame image are divided into four quadrants separately, each quadrant comprises one in described four basic pixel points; In each quadrant, be (x' by current frame image arbitrary coordinate in this quadrant, y') on pixel gray value write display screen, coordinate is on the pixel of [(x-(x-x') * N), (y-(y-y') * N)]; According to the gray value having write any two neighbor pixels of gray value current on display screen, obtained the gray value of other each blank pixel points between described any two neighbor pixels by interpolation; Described two neighbor pixels are, only comprise describedly currently having write two pixels adjacent in the set of all pixels of gray value; (x, y) is the coordinate of basic pixel point in described quadrant.
6. device according to claim 5, is characterized in that, described gray value computation subunit, when carrying out interpolating operations, by coordinate is
the gray value of pixel is set to
wherein, (x
1, y
1) and (x
2, y
2) be the coordinate of described any two neighbor pixels, the gray value that F () is pixel, n=1,2 ..., N.
7. an audio/video player system, is characterized in that, described system comprises: video main control server, home gateway device and television terminal;
Described video main control server, for sending to described home gateway device by the current frame image data of video image;
Described home gateway device, for the current frame image data of receiver, video image, and according to the current frame image data of reception and the resolution of described television terminal display screen, determine the gray value of each pixel on described television terminal display screen, the gray value of each pixel determined is sent to described television terminal;
Described television terminal, the gray value for each pixel sent according to home gateway device carries out image display;
Wherein, described home gateway device, when calculating the gray value of each pixel, calculate the gray value of each pixel in the current frame image received, and need the multiple N of expansion according to the resolution of display screen and the current frame image data determination current frame image of reception; By pixel based on four, the center pixel of the current frame image of reception, by four pixels at the gray value of four described basic pixel points correspondence write display screen center; Centered by described four basic pixel points, display screen and current frame image are divided into four quadrants separately, each quadrant comprises one in described four basic pixel points; In each quadrant, be (x' by current frame image arbitrary coordinate in this quadrant, y') on pixel gray value write display screen, coordinate is on the pixel of [(x-(x-x') * N), (y-(y-y') * N)]; According to the gray value having write any two neighbor pixels of gray value current on display screen, obtained the gray value of other each blank pixel points between described any two neighbor pixels by interpolation; Described two neighbor pixels are, only comprise describedly currently having write two pixels adjacent in the set of all pixels of gray value; (x, y) is the coordinate of basic pixel point in described quadrant.
8. system according to claim 7, is characterized in that, described home gateway device, when carrying out interpolating operations, by coordinate is
the gray value of pixel is set to
wherein, (x
1, y
1) and (x
2, y
2) be the coordinate of described any two neighbor pixels, the gray value that F () is pixel, n=1,2 ..., N.
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