CN101860711A - Method and device for displaying small video on digital television - Google Patents
Method and device for displaying small video on digital television Download PDFInfo
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Abstract
The invention relates to a method and a device for displaying a small video on a digital television. The method comprises the following steps of: decoding standard-definition video data to obtain YUV data; down-sampling the standard-definition video YUV data to obtain small video YUV data; performing MPEG2 coding on the small video YUV data to obtain standard image data of the small video; and generating standard-definition background video data, embedding the standard image data of the small video into the standard-definition background video data, decoding the data through an MPEG2 decoder and outputting and displaying the data. The method and the device of the invention can display the small video of which the definition is lower than that of a standard-definition image on the digital television so as to enlarge the display range of the digital television and well promote the user experience.
Description
Technical Field
The invention relates to the technical field of digital televisions, in particular to a method and a device for displaying a small video on a digital television.
Background
With the rapid development of science and technology, digital televisions are more and more popular at present; the video images on the digital tv are usually standard definition images, i.e. images with a resolution of 720 × 576 pixels, and the conventional display process of such standard definition images is as follows: an MPEG2(Moving pictures experts Group) decoder receives a video file transmitted from an external device, decodes the video file, and displays the decoded image on a display screen of a digital television.
Meanwhile, with the development of digital television display technology, various small videos with resolution lower than standard definition video are produced, for example, videos with resolution of 176x144, and when different requirements are met, the small videos are often required to be displayed on a digital television; however, if the MPEG2 decoder receives a small video file transmitted from an external device according to the conventional image display method, and then the small video file is directly decoded in a manner of processing a standard definition video image, the decoder will tend to stretch the small video file or cause abnormal display, so that the small video file cannot be normally displayed on the screen of the digital tv.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for displaying a small video on a digital television, so that the small video with a resolution smaller than a standard definition image can be displayed on the digital television, thereby increasing a display range of the digital television and well improving user experience.
In order to solve the above problems, the technical solutions provided by the embodiments of the present invention are as follows:
a method of displaying small videos on a digital television, comprising:
decoding standard definition video data to obtain YUV data;
obtaining small video YUV data by down-sampling standard definition YUV data;
MPEG2 coding is carried out on the small video YUV data to obtain standard image data of the small video;
and generating standard definition background video data, embedding the standard image data of the small video into the standard definition background video data, decoding by an MPEG2 decoder, and outputting and displaying.
An apparatus for displaying small videos on a digital television, comprising: the device comprises a decoding unit, a sampling unit, an encoding unit and a generating and displaying unit; wherein,
the decoding unit is used for decoding standard definition video data to obtain YUV data;
the sampling unit is used for down-sampling standard definition video YUV data obtained by decoding by the decoding unit to obtain small video YUV data;
the coding unit is used for carrying out MPEG2 coding on the small video YUV data obtained by the sampling unit and sending the obtained small video standard image data to the generating and displaying unit;
and the generating and displaying unit is used for generating standard definition background video data, embedding the small video standard image data transmitted by the encoding unit into the standard definition background video data, and outputting and displaying the small video standard image data after decoding by an MPEG2 decoder.
It can be seen that, by using the method and apparatus of the embodiments of the present invention, the standard definition video image is generated as a background picture, and the small video to be displayed is embedded into the large video, and then sent to the MPEG2 decoder for decoding, so that the MPEG2 decoder performs decoding of the standard definition video image, and the decoded standard definition video image can normally display the small video image.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for displaying a small video on a digital television according to embodiment 1 of the present invention;
FIG. 2 is a schematic flow chart of recovering a bit stream in the method according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of an apparatus for displaying a small video on a digital television according to embodiment 2 of the present invention.
Detailed Description
The basic idea of the invention is that in order to enable an MPEG2 decoder to normally decode and normally display a small video, a standard definition video image with the resolution of 720x576 is generated as a background picture, the small video to be displayed is embedded into the large video, and then the large video is sent to an MPEG2 decoder for decoding, so that the MPEG2 decoder performs the decoding of the standard definition video image, and the decoded standard definition video image can normally display the small video image;
it should be noted that the small videos mentioned in the embodiments of the present invention are all video images with a resolution smaller than 720x576 of the standard definition video, which are hereinafter referred to as "small videos"; the large video is a standard definition video image with a resolution greater than that of the small video, and is hereinafter referred to as the "large video".
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
step 110: decoding standard definition video data to obtain YUV data;
in practical application, when standard definition video data is decoded, bit streams obtained by compressing the standard definition video data are mainly reduced into YUV data; the specific reduction method can be realized by the following steps, as shown in fig. 2, but is not limited thereto:
s111: receiving a bit stream after the standard definition video data compression, and sending the received bit stream to an input cache;
s112: carrying out inverse Huffman decoding and inverse quantization processing on the bit stream input into the buffer memory in sequence;
s113: and finally, performing inverse DCT (Discrete Cosine Transform) processing on the output after inverse quantization to obtain image information, namely YUV data.
Step 120: obtaining small video YUV data by down-sampling standard definition YUV data;
the downsampling mainly comprises the steps of extracting partial YUV data from the YUV data with large standard definition video data, and reducing the number of pixels, so that new YUV video data with low resolution is formed, namely YUV data of a small video; for example: if the original standard definition video data is in YUV420 format, the resolution is 704x576, wherein the Y component has 720x576 pixels; if the standard definition video YUV data is to be downsampled to obtain small video YUV data with a resolution of 176x144, since 704/176 is 4 and 576/144 is 4, a specific extraction method is to extract one pixel every 4 pixels in the horizontal and vertical directions, where the process of extracting all pixels is a downsampling process; similarly, the process of extracting the UV component in the YUV data is also similar, and is not described herein again.
Step 130: MPEG2 coding is carried out on the small video YUV data to obtain standard image data of the small video;
the MPEG2 encoding operations mentioned in this embodiment include, but are not limited to: compressing the uncompressed small video YUV data obtained by down-sampling according to an MPEG2 video standard protocol; specific encoding processes include, but are not limited to:
s131: firstly, carrying out DCT and quantization processing on uncompressed small video YUV data obtained by down-sampling;
s132: and outputting a compressed video stream after the quantized data is subjected to Huffman coding.
Step 140: generating standard definition background video data, embedding the standard image data of the small video into the standard definition background video data, decoding by an MPEG2 decoder, and outputting and displaying;
it should be noted that the embedding process mentioned in this embodiment is a process of filling a macroblock: sequentially filling background data and small video data macro blocks in the standard definition video data, wherein the filling sequence is from left to right and from top to bottom, and naturally, the filling can also be performed sequentially in other manners, which is not described herein again; specific filling processes include, but are not limited to, the following steps:
s141: extracting related parameters of a background data macro block; including but not limited to: address increment, macroblock mode, quantization, motion vectors, CBP and Block data, etc.;
s142: calculating the number of rows and columns to be filled in standard definition video data, and filling the rows and columns in background data macro blocks with the same number of rows and columns; for example, the standard video is 720x576 pixels, and since the width and height of the macroblock are 16 pixels, the macroblocks of background data need to be filled in total, wherein 720/16 equals 36 rows and 720/16 equals 45 columns; that is to say that the first and second electrodes,
data of the first row: 00000101 macroblock 1 macroblock 2.. macroblock 45;
data of the first row: 00000102 macroblock 1 macroblock 2.. macroblock 45;
wherein 000001 is a start code; after the 36 rows are sequentially generated, that is, data of one frame is generated, and so on, which is not described in this embodiment again.
S143: determining the corner position of the small video in the background video, and then filling the small video data macro blocks by using the same process as the S142 to finish the embedding of the small video;
it should be noted that, in this embodiment, after the small video is embedded in the standard definition video, since the decoding by the MPEG2 decoder is only for the standard definition video image, the decoding process at this time can adopt the conventional decoding and displaying method, and the real image after being output is the standard definition video including the small video image.
It can be seen that, with the method of the above embodiment, the standard definition video image is generated as the background picture, the small video to be displayed is embedded into the large video, and then the large video is sent to the MPEG2 decoder for decoding, so that the MPEG2 decoder performs the decoding of the standard definition video image, and the decoded standard definition video image can normally display the small video image.
Based on the above idea, embodiment 2 of the present invention further provides an apparatus for displaying a small video on a digital television, as shown in fig. 3, the apparatus 300 includes: a decoding unit 310, a sampling unit 320, an encoding unit 330, and a generation display unit 340; wherein,
the decoding unit 310 is configured to decode standard definition video data to obtain YUV data;
the sampling unit 320 is configured to down-sample standard definition video YUV data obtained by decoding by the decoding unit 310 to obtain small video YUV data;
the encoding unit 330 is configured to perform MPEG2 encoding on the small video YUV data obtained by the sampling unit 320, and send the obtained small video standard image data to the generating and displaying unit 340;
the generating and displaying unit 340 is configured to generate standard definition background video data, embed the small video standard image data sent by the encoding unit 330 into the standard definition background video data, and output and display the small video standard image data after decoding by an MPEG2 decoder.
Based on the above structure, the decoding unit 310 may further include: the device comprises a receiving module, a first processing module and a second processing module; wherein,
the receiving module is used for receiving the bit stream after the standard definition video data compression and sending the received bit stream to the input cache; the first processing module is used for successively carrying out inverse Huffman decoding and inverse quantization processing on the bit stream input into the cache; the second processing module is used for performing inverse discrete cosine transform processing on the data output by the first processing module.
In addition, the sampling unit 320 may further include: a determining module and an extracting module; the determining module is used for calculating the ratio of the resolution of the small video to the standard definition video; the extraction module is used for extracting partial pixels in the horizontal direction and the vertical direction according to the resolution ratio determined by the determination module.
In addition, the encoding module 330 may further include: a third processing module and a fourth processing module; wherein,
the third processing module is used for performing DCT and quantization processing on uncompressed small video YUV data obtained by down-sampling; and the fourth processing module is used for outputting a compressed video stream after the data processed by the third processing module is subjected to Huffman coding.
It is to be noted that, based on the mechanical features of the above embodiment, the generation display unit 340 in embodiment 2 of the present invention may further include: the device comprises an acquisition module, a calculation module and a filling module; wherein,
the acquisition module is used for acquiring related parameters of the background data and the small video data macro blocks;
the calculation module is used for calculating the number of rows and columns needing to be filled in the standard definition video data and filling the background data macro blocks with the same number of rows and columns;
the filling module is used for determining the corner position of the small video in the background video, then calculating the number of rows and columns needing to be filled in the background video data, and filling the small video data macro blocks with the same number as the rows and columns in the background video data.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (14)
1. A method for displaying small videos on a digital television, comprising:
decoding standard definition video data to obtain YUV data;
obtaining small video YUV data by down-sampling standard definition YUV data;
MPEG2 coding is carried out on the small video YUV data to obtain standard image data of the small video;
and generating standard definition background video data, embedding the standard image data of the small video into the standard definition background video data, decoding by an MPEG2 decoder, and outputting and displaying.
2. The method of claim 1, wherein the decoding of the standard definition video data specifically comprises: and reducing the bit stream after the standard definition video data compression into YUV data.
3. The method of claim 2, wherein the compressed bit stream of standard definition video data is reduced to YUV data by:
receiving a bit stream after the standard definition video data compression, and sending the received bit stream to an input cache;
carrying out inverse Huffman decoding and inverse quantization processing on the bit stream input into the buffer memory in sequence;
and finally, performing inverse discrete cosine transform processing on the output after inverse quantization to obtain YUV data.
4. The method according to claim 1, wherein the downsampling of the standard definition video YUV data is specifically:
calculating the ratio of the resolution of the small video to the standard definition video;
extracting a part of pixels in horizontal and vertical directions in accordance with the ratio of the resolution.
5. The method according to claim 1, wherein the MPEG2 encoding of the small video YUV data is specifically: and compressing the uncompressed small video YUV data obtained by down-sampling according to an MPEG2 video standard protocol.
6. The method of claim 5, wherein the MPEG2 encoding of the small video YUV data is achieved by:
performing DCT and quantization processing on uncompressed small video YUV data obtained by down-sampling;
and outputting a compressed video stream after the quantized data is subjected to Huffman coding.
7. The method according to claim 1, wherein the embedding of the standard image data of the small video into the standard definition background video data specifically comprises: and filling background data and small video data macro blocks in the standard definition video data in sequence, wherein the filling sequence is from left to right and from top to bottom.
8. The method of claim 7, wherein the filling process comprises:
obtaining related parameters of background data and small video data macro blocks;
calculating the number of rows and columns to be filled in standard definition video data, and filling the rows and columns in background data macro blocks with the same number of rows and columns;
determining the corner position of the small video in the background video, then calculating the number of lines and columns needing to be filled in the background video data, and filling the small video data macro blocks with the same number as the lines and columns in the background video data.
9. The method of claim 8, wherein the macroblock-related parameters comprise: address increment, macroblock mode, quantization, motion vector, CBP, and block data.
10. An apparatus for displaying small videos on a digital television, comprising: the device comprises a decoding unit, a sampling unit, an encoding unit and a generating and displaying unit; wherein,
the decoding unit is used for decoding standard definition video data to obtain YUV data;
the sampling unit is used for down-sampling standard definition video YUV data obtained by decoding by the decoding unit to obtain small video YUV data;
the coding unit is used for carrying out MPEG2 coding on the small video YUV data obtained by the sampling unit and sending the obtained small video standard image data to the generating and displaying unit;
and the generating and displaying unit is used for generating standard definition background video data, embedding the small video standard image data transmitted by the encoding unit into the standard definition background video data, and outputting and displaying the small video standard image data after decoding by an MPEG2 decoder.
11. The apparatus of claim 10, wherein the decoding unit comprises: the device comprises a receiving module, a first processing module and a second processing module; wherein,
the receiving module is used for receiving the bit stream after the standard definition video data compression and sending the received bit stream to the input cache;
the first processing module is used for successively carrying out inverse Huffman decoding and inverse quantization processing on the bit stream input into the cache;
the second processing module is used for performing inverse discrete cosine transform processing on the data output by the first processing module.
12. The apparatus of claim 10, wherein the sampling unit comprises: a determining module and an extracting module; wherein,
the determining module is used for calculating the ratio of the resolution of the small video to the standard definition video;
the extraction module is used for extracting partial pixels in the horizontal direction and the vertical direction according to the resolution ratio determined by the determination module.
13. The apparatus of claim 10, wherein the encoding module comprises: a third processing module and a fourth processing module; wherein,
the third processing module is used for performing DCT and quantization processing on uncompressed small video YUV data obtained by down-sampling;
and the fourth processing module is used for outputting a compressed video stream after the data processed by the third processing module is subjected to Huffman coding.
14. The apparatus of claim 10, wherein the generating the display unit comprises: the device comprises an acquisition module, a calculation module and a filling module; wherein,
the acquisition module is used for acquiring related parameters of the background data and the small video data macro blocks;
the calculation module is used for calculating the number of rows and columns needing to be filled in the standard definition video data and filling the background data macro blocks with the same number of rows and columns;
the filling module is used for determining the corner position of the small video in the background video, then calculating the number of rows and columns needing to be filled in the background video data, and filling the small video data macro blocks with the same number as the rows and columns in the background video data.
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| CN 201010207564 CN101860711B (en) | 2010-06-13 | 2010-06-13 | Method and device for displaying small video on digital television |
| HK11102445.4A HK1148411A1 (en) | 2010-06-13 | 2011-03-10 | Method and device for displaying small video on digital television |
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| CN107920251A (en) * | 2016-10-06 | 2018-04-17 | 英特尔公司 | The method and system of video quality is adjusted based on the distance of beholder to display |
| CN108989849A (en) * | 2018-08-01 | 2018-12-11 | 广州长嘉电子有限公司 | A kind of DVB-T2+S2 TV signal processing method and system |
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| HK1148411A1 (en) | 2011-09-02 |
| CN101860711B (en) | 2012-01-11 |
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