JP2012124899A - Digital video transmission device and method, digital video reception device and method, and digital video transmission and reception system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital video transmission and reception system and method.SOLUTION: A digital video transmission and reception system may includes: a video transmission device deciding a down-sampling rate depending on a bandwidth of a transmission network, down-sampling an ultra-high image quality digital video at the decided down-sampling rate, and encoding and multiplexing the down-sampled digital video to transmit the encoded and multiplexed digital video via a transmission network; a video reception device receiving the digital video transmitted from such a video transmission device and demultiplexing and decoding the received digital video, receiving information on the down-sampling rate from the video transmission device, and interpolating the decoded digital video based on the received information to restore the ultra-high image quality digital video. Accordingly, the ultra-high image quality digital video can be transmitted efficiently while minimizing deterioration in image quality.

Description

  The present invention relates to a digital video transmission device and method, a digital video reception device and method, and a digital video transmission / reception system. The present invention relates to a technique capable of easily adjusting and transmitting the received digital video to an ultra high image quality at the receiving end.

  Generally, in a digital video broadcast service, a digital broadcast signal is transmitted to a terminal via a wired or wireless communication network, and the terminal that receives the transmitted broadcast signal can view a broadcast program in real time for the user. Means a service that enables Such a digital video broadcasting service can provide users with various high-quality services that cannot be provided by existing analog broadcasting services.

  Recently, in response to a user's request to view an ultra-high-quality screen, a technique for efficiently transmitting and processing ultra-high-quality digital video via a communication network has been actively proposed. However, ultra-high-quality digital video usually has a considerably large capacity, but in the case of a transmission communication network, the transmittable bandwidth is limited, so when a large amount of data is transmitted, the transmission speed May be delayed or excessive resources may be consumed.

  Therefore, conventionally, a large-capacity ultra-high-quality digital video is divided into a certain size, and the divided digital video is divided into a plurality of channels for transmission, or when a part of the digital video is not broadcast time Large-capacity digital video was provided through techniques such as transmitting in advance and transmitting the remaining digital video during the broadcast time.

  However, the above-described prior art requires a process such as dividing a digital video into a plurality of parts, so the system configuration becomes complicated, and it is difficult to accurately synchronize synchronization between separated digital videos. There were various problems. Therefore, there is an urgent need for an improved technique that can efficiently transmit large-capacity ultra-high-quality digital video.

  The present invention has been made in view of such a situation, and transmits network video by down-sampling and transmitting ultra-high-quality digital video data in consideration of the bandwidth of the transmission communication network. It is an object of the present invention to provide a digital video transmission apparatus and method capable of reducing the above.

  Another technical object of the present invention is to provide a digital video receiving apparatus and method capable of receiving down-sampled digital video data from a video transmitting apparatus and restoring the digital video data to a super high quality digital video.

  Another technical problem of the present invention is that the transmitting end transmits digital video obtained with ultra-high quality by adjusting the resolution to be scalable according to the bandwidth of the transmitting network, and the receiving end transmits the received digital video. It is an object of the present invention to provide a digital video transmission / reception system that can be easily restored to an ultra-high image quality.

  In order to achieve such a technical problem, the present invention provides a digital video transmission apparatus according to one aspect. The digital video transmission apparatus acquires at least one of transmission network bandwidth information and information related to a down-sampling ratio, and supports the transmission network bandwidth based on the acquired information. A downsampling ratio determining unit for determining a downsampling ratio to be performed; a video downsampling unit for downsampling an ultra-high-quality digital video according to the downsampling ratio determined by the downsampling ratio determining unit; An encoding unit that encodes; and a video multiplexing and transmission unit that multiplexes the encoded digital video and transmits the multiplexed digital video to a video receiving apparatus via the transmission network. The video multiplexing and transmission unit transmits information regarding the downsampling ratio to the video receiving apparatus.

  The downsampling ratio determining unit provides a user interface through which information related to the downsampling ratio can be input, and determines the downsampling ratio according to information input through the user interface.

  The downsampling ratio determination unit acquires transmission network bandwidth information through at least one of input via a user interface and communication with an external entity, and based on the acquired transmission network bandwidth information The table is queried to determine the downsampling ratio corresponding to the transmission network bandwidth information.

  Meanwhile, in order to solve the above-described technical problem of the present invention, the present invention provides a digital video transmission method according to another aspect. The digital video transmission method may obtain at least one of transmission network bandwidth information and information related to a down-sampling ratio; a bandwidth of the transmission network based on the acquired information Determining a downsampling ratio corresponding to: downsampling ultra-high quality digital video according to the determined downsampling ratio; encoding the downsampled digital video; and the encoded Multiplexing the digital video and transmitting it to the video receiver via the transmission network. The digital video transmission method further includes transmitting information on the downsampling ratio to the video receiving apparatus.

  Determining the downsampling ratio includes providing a user interface capable of inputting the downsampling ratio and related information; and determining the downsampling ratio according to information input through the user interface. A stage.

  On the other hand, the step of determining the downsampling ratio includes acquiring transmission network bandwidth information through input via a user interface or communication with an external entity; and based on the acquired transmission network bandwidth information. Querying a table to determine the downsampling ratio corresponding to the transmission network bandwidth information.

  Meanwhile, in order to solve another technical problem of the present invention described above, the present invention provides a digital video receiving apparatus according to another aspect. The digital video receiving apparatus receives digital video transmitted from a video transmitting apparatus via a transmission network and information on a down-sampling ratio of the digital video, and demultiplexes the received digital video. A video receiving and demultiplexing unit; a decoding unit for decoding the demultiplexed digital video; and an ultra-high by interpolating the decoded digital video based on a downsampling ratio of the digital video A video interpolator that restores digital video of image quality.

  The video reception and demultiplexing unit obtains information on a downsampling ratio of the digital video from at least one of a digital video packet and a specific signal transmitted from the video transmission device, and sends the information to the video interpolation unit. Send.

  The digital video receiver further includes an output unit that transmits the restored super high-quality digital video to a display device. The display device displays the super-high-quality digital video through one of a progressive scan mode and an interlaced scan mode.

  Meanwhile, in order to solve the other technical problems of the present invention described above, the present invention provides a digital video receiving method in another aspect. The digital video receiving method includes receiving digital video transmitted from a video transmission apparatus via a transmission network and information on a down-sampling ratio of the digital video; demultiplexing the received digital video Decoding the demultiplexed digital video; and interpolating the decoded digital video based on a downsampling ratio of the digital video to restore a super high quality digital video Including the step of:

  The digital video receiving method may further include obtaining information on a downsampling ratio of the digital video from at least one of a digital video packet and a specific signal transmitted from the video transmission apparatus.

  The digital video receiving method further includes the step of transmitting the restored ultra-high-quality digital video to a display device, wherein the display device is in one of a progressive scan mode and an interlace scan mode. It is an apparatus for displaying the super high quality digital video.

  Meanwhile, in order to solve the other technical problems of the present invention described above, the present invention provides a digital video transmission / reception system in another aspect. The digital video transmission / reception system determines a downsampling ratio according to a bandwidth of a transmission network, downsamples ultra-high quality digital video according to the determined downsampling ratio, and performs the downsampling. A video transmission apparatus that encodes and multiplexes the digital video that has been encoded and transmits the digital video via the transmission network; and receives and demultiplexes and decodes the digital video transmitted from the video transmission apparatus, and the video transmission apparatus A video receiving device that receives information on the downsampling ratio from the receiver and interpolates the decoded digital video based on the received information to restore the super-high-quality digital video.

  As described above, according to the present invention, after super high quality digital video is transmitted with reduced resolution in consideration of the bandwidth of the transmission network, it can be restored to super high quality again at the receiving end. Therefore, image quality degradation can be minimized and conventional problems such as an increase in system complexity and synchronization problems can be solved.

1 is a block diagram illustrating a configuration of a digital video transmission / reception system according to a preferred embodiment of the present invention. 3 is a flowchart illustrating a digital video transmission method according to a preferred embodiment of the present invention. 3 is a flowchart illustrating a digital video receiving method according to a preferred embodiment of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand the technical matters of the present invention. In the preferred embodiments of the invention described below, certain technical terms are used for clarity of content. However, it is clear in advance that the present invention is not limited to the selected specific terms, and that each specific term includes all technical synonyms that operate in a similar manner to achieve a similar purpose. To.

  FIG. 1 is a block diagram showing a configuration of a digital video transmission / reception system according to a preferred embodiment of the present invention.

  Referring to FIG. 1, a digital video transmission / reception system 1 according to a preferred embodiment of the present invention may include a video transmission device 10 and a video reception device 20. The video transmission device 10 and the video reception device 20 can be linked to each other via a transmission network, for example, a wired or wireless communication network. In addition, the video transmission device 10 can communicate with the video acquisition and processing device 40, and the video reception device 20 can communicate with the display device 30.

  The video transmission apparatus 10 converts the video transmission apparatus 20 to be scalable in consideration of the bandwidth of a transmission network to transmit ultra-high definition (UHD) digital video, and the video reception apparatus 20 passes through the transmission network. Send to. For example, the video transmission apparatus 10 determines a downsampling ratio based on the bandwidth of the transmission network, and after downsampling ultra-high quality digital video with the determined downsampling ratio (Down-Sampling), the downsampling is performed. The encoded digital video can be encoded and multiplexed and transmitted through a transmission network.

  As shown in FIG. 1, the video transmission apparatus 10 includes a video reception unit 11, a downsampling ratio determination unit 12, a video downsampling unit 13, a video encoding unit 14, a video multiplexing and transmission unit 15, and the like. Can be included.

  The video receiver 11 can communicate with the video acquisition and processing device 40. At this time, the video acquisition and processing device 40 means a device that acquires and stores ultra-high-quality digital video via a broadcast camera, a content source, a CG (Computer Graphics) tool, or the like. The video receiver 11 can receive a super high quality digital video from the video acquisition and processing device 40.

  The super high quality digital video has a horizontal / vertical pixel count of 2,000 (1,920 × 1,080, ie, 2K), 4,000 (3,840 × 2,160, ie, 4K) or 8 000 (7,680 × 4,320, ie, 8K). Assuming that the screen resolution depends on the number of pixels, 4K digital video is 4 times clearer than 2K digital video, and 8K digital video is 2K digital video. 16 times more vivid. The screen scan rate, ie the number of frames per second, is 30 Hz for typical high-quality digital video, while the super-high-quality digital video is 60 Hz, and it is much more natural to transmit 60 frames per second, and Dynamic screen representation is possible. Meanwhile, the super-high-quality digital video may be binocular 3D (3-dimension) or a multi-time video that can be viewed by a large number of people without glasses.

  The downsampling ratio determining unit 12 performs a function of determining a downsampling ratio for downsampling the super high quality digital video received by the video receiving unit 11 according to the bandwidth capacity of the transmission network, that is, the bandwidth. Can do. The downsampling ratio determination unit 12 obtains at least one of transmission network bandwidth information and downsampling ratio information through user input or communication with an external entity, and uses the acquired information as the acquired information. Based on this, a downsampling ratio for downsampling the ultra-high quality digital video can be determined.

  For example, the downsampling ratio determination unit 12 provides a user interface that allows the user to input a downsampling ratio that takes into account the bandwidth of the transmission network, and determines the downsampling ratio based on information input through the user interface. can do. That is, the downsampling ratio is determined by the downsampling ratio desired by the user.

  Alternatively, the downsampling ratio determination unit 12 provides a user interface that allows a user to input transmission network bandwidth information, and determines the downsampling ratio based on the transmission network bandwidth information input via the user interface. it can. In this case, the downsampling ratio determination unit 12 can store and manage a transmission network bandwidth-downsampling ratio table indicating a transmission network bandwidth and a preset downsampling ratio corresponding to the transmission network bandwidth. The downsampling ratio can be determined by querying the downsampling ratio corresponding to the transmission network bandwidth information input by the user in the transmission network bandwidth-downsampling ratio table.

  On the other hand, the downsampling ratio determination unit 12 acquires information on the transmission network bandwidth requested to an entity capable of informing the transmission network bandwidth information, for example, a transmission network management server, and the acquired transmission network bandwidth. The downsampling ratio can also be determined by information. Also in this case, the downsampling ratio determination unit 12 stores and manages a transmission network bandwidth-downsampling ratio table indicating a transmission network bandwidth and a preset downsampling ratio corresponding to the transmission network bandwidth. The downsampling ratio can be determined by querying the downsampling ratio corresponding to the transmission network bandwidth information acquired from the transmission network management server or the like in the transmission network bandwidth-downsampling ratio table.

  The video downsampling unit 13 can perform a function of downsampling the super-high-quality digital video received by the video receiving unit 11 with the downsampling ratio determined by the downsampling ratio determining unit 12. For example, the video downsampling unit 13 can downsample a super high quality digital video having a horizontal / vertical number of pixels of 1,920 × 1,080 into a 1,280 × 720 digital video or the like according to a downsampling ratio. .

  The video encoding unit 14 may perform a function of encoding the digital video downsampled by the video downsampling unit 13. For example, the video encoding unit 14 can encode the downsampled digital video by a compression format such as MPEG-2, MPEG-4 AVC (H.264).

  The video multiplexer / transmitter 15 can perform the function of multiplexing the digital video encoded by the video encoder 14 and then transmitting the multiplexed video to the video receiver 20 via the transmission network. For example, the video multiplexing unit and transmission unit 15 multiplexes the digital video encoded by the video encoding unit 14, then generates a digital video packet including the multiplexed digital video, and sends it to the video reception device 20. Can be sent.

  The video multiplexing unit and transmission unit 15 receives information about the downsampling ratio determined by the downsampling determination unit 12 from the downsampling ratio determination unit 12 or the video downsampling unit 13 and transmits the information to the video reception device 20. can do. For example, the video multiplexing / transmission unit 15 can also insert and transmit information about the downsampling ratio in the header of a digital video packet to be transmitted to the video receiving device 20, or a specific signal indicating information about the downsampling ratio. It can also be sent.

  On the other hand, the video reception device 20 receives digital video transmitted from the video transmission device 10 via the transmission network, demultiplexes and decodes the received digital video, and receives information on the downsampling ratio from the video reception device 10. , And interpolating the decoded digital video based on the downsampling ratio, thereby performing a function such as restoring a super-high-quality digital video.

  As shown in FIG. 1, the video receiving apparatus 20 may include a video receiving / demultiplexing unit 21, a video decoding unit 22, a video interpolation unit 23, a video output unit 24, and the like.

  The video receiving / demultiplexing unit 21 can perform a function of receiving and demultiplexing digital video transmitted from the video transmitting apparatus 10. At this time, the digital video received from the video transmission device 10 means a digital video packet including the digital video multiplexed by the video transmission device 10. That is, the video reception and demultiplexing unit 21 can receive the digital video packet transmitted from the video transmission device 10 and extract the multiplexed digital video, and then perform the demultiplexing.

  On the other hand, the video reception and demultiplexing unit 21 can receive information about the downsampling ratio transmitted from the video transmission device 10 and transmit the information to the video interpolation unit 23. For example, the video reception and demultiplexing unit 21 extracts downsampling ratio information inserted in the digital video packet and transmits it to the video interpolation unit 23 or receives a specific signal indicating the downsampling ratio information. It can be transmitted to the video interpolation unit 23.

  The video decoding unit 22 can decode the digital video demultiplexed by the video reception and demultiplexing unit 21. For example, the video decoding unit 22 can decode digital video encoded by a compression format such as MPEG-2, MPEG-4 AVC (H.264).

  The video interpolation unit 23 can interpolate the digital video decoded by the video decoding unit 22, that is, the down-sampled digital video based on the down-sampling ratio. In other words, the video interpolation unit 23 restores the downsampled digital video to the original ultra-high quality digital video.

  The video output unit 24 can transmit the digital video interpolated by the video interpolation unit 23, that is, the super high quality digital video, to the display device 30. Further, the display device 30 can display the super high quality digital video output by the video output unit 24.

  FIG. 2 is a flowchart for explaining a digital video transmission method according to a preferred embodiment of the present invention, and shows an operation flow of the video transmission apparatus 10 shown in FIG.

  As shown in FIG. 2, first, the video transmitting apparatus 10 can receive a super high quality digital video from the video acquisition and processing apparatus 40 (step: S11). For example, the ultra-high-quality digital video is an ultra-high-quality video or a multi-time video including the number of pixels such as 2K, 4K, and 8K.

  Next, the video transmitting apparatus 10 can determine a downsampling ratio for downsampling the super high quality digital video (step: S12). To this end, the video transmission apparatus 10 can acquire transmission network bandwidth information or downsampling ratio related information from a user input or an external entity.

  For example, the video transmission apparatus 10 can provide a user interface capable of inputting a downsampling ratio, and can set the downsampling ratio according to information input through the user interface. Alternatively, the video transmission device 10 can provide a user interface that can input transmission network bandwidth information, and can determine a downsampling ratio by querying a table according to transmission network bandwidth information input from the user. . On the other hand, the video transmission apparatus 10 may receive transmission network bandwidth information from an external entity such as a transmission network management server, and determine a downsampling ratio by referring to a table according to the received transmission network bandwidth information. it can.

  When the downsampling ratio is determined, the video transmitting apparatus 10 performs downsampling on the received ultra-high-quality digital video according to the determined downsampling ratio (step: S13).

  Next, the video transmitting apparatus 10 can encode the downsampled digital video (step: S14). When the encoding is completed, the video transmitting apparatus 10 can multiplex the encoded digital video and transmit it to the video receiving apparatus 20 via the transmission network (step: S15).

  FIG. 3 is a flowchart for explaining a digital video receiving method according to a preferred embodiment of the present invention, and shows an operation flow of the video receiving apparatus 20 shown in FIG.

  As shown in FIG. 3, first, the video receiving device 20 can receive digital video transmitted from the video transmitting device 10 described above via a transmission network. At this time, the received digital video means a digital video packet including the digital video multiplexed by the video transmitting apparatus 10. The video receiver 20 can demultiplex the received digital video (step: S21).

  Next, the video receiving apparatus 20 can decode the demultiplexed digital video (step: S22). Upon completion of the decoding, a downsampled digital video can be extracted.

  On the other hand, the video receiving device 20 can receive the information of the downsampling ratio transmitted from the video transmitting device 10. The video receiver 20 can restore the ultra-high-quality digital video by interpolating the down-sampled digital video extracted by decoding based on the received down-sampling ratio information (step: S23).

  When the super high quality digital video is restored, the video receiving device 20 can transmit the restored super high quality digital video to the display device 30. Further, the display device 30 can display the super high quality digital video transmitted from the video receiving device 20.

  Preferably, the scan mode in the display device 30 is a progressive scan mode. This is because when the video compression rate is increased, when the image quality of the decoded interlace (Interlace) scan video having the same resolution and the progressive video is compared, the image quality reduction amount is large in the interlace scan mode. In fact, using the interlaced scan mode instead of the progressive scan mode while maintaining ultra-high image quality, using the progressive scan mode maintains a subjective image quality similar to the original resolution, even if the resolution is lowered. be able to. However, this is not a limitation, and the scan mode of the display device may be an interlaced scan mode.

  For example, when comparing a 1,920 × 1,080 pixel digital video, ie, 1080P digital video, and a 1,280 × 720 pixel digital video, ie, 720P digital video, the overall resolution is 1080P digital. If the video is higher than 720P digital video, but the same progressive scan is used, the quality of the video restored after encoding is compared to 1080i when it is transmitted to 720P and restored to 1080P, as in current terrestrial broadcasting There is much less image quality degradation than sending to.

  As described above, according to a preferred embodiment of the present invention, after super high quality digital video is transmitted with reduced resolution in consideration of the bandwidth of the transmission network, it is restored to super high quality again at the receiving end. be able to. Accordingly, it is possible to solve the conventional problems such as an increase in system complexity and a synchronization problem while minimizing the deterioration in image quality.

  While the present invention has been described with reference to the preferred embodiments thereof, those skilled in the art are within the technical scope and scope of the present invention described in the claims. It can be understood that the present invention can be implemented with various modifications and changes. Therefore, changes in future embodiments of the present invention cannot deviate from the technology of the present invention.

Claims (15)

Acquire at least one of transmission network bandwidth information and information related to a down-sampling ratio, and determine a down-sampling ratio corresponding to the bandwidth of the transmission network based on the acquired information. Downsampling ratio determining unit;
A video down-sampling unit for down-sampling ultra-high-quality digital video according to the down-sampling rate determined by the down-sampling rate determining unit;
An encoder for encoding the downsampled digital video; and
A video multiplexing and transmitting unit that multiplexes the encoded digital video and transmits the multiplexed digital video to a video receiving device via the transmission network;
A digital video transmission apparatus comprising:   The downsampling ratio determining unit provides a user interface capable of inputting information related to the downsampling ratio, and determines the downsampling ratio according to information input through the user interface. The digital video transmission apparatus according to claim 1.   The downsampling ratio determination unit acquires transmission network bandwidth information through at least one of input via a user interface and communication with an external entity, and based on the acquired transmission network bandwidth information 2. The digital video transmission apparatus according to claim 1, wherein the table is queried to determine the downsampling ratio corresponding to the transmission network bandwidth information.   The digital video transmission apparatus according to claim 1, wherein the video multiplexing and transmission unit transmits information on the downsampling ratio to the video reception apparatus. Obtaining at least one of transmission network bandwidth information and information related to a down-sampling ratio;
Determining a downsampling ratio corresponding to the bandwidth of the transmission network based on the acquired information;
Down-sampling ultra-high-quality digital video according to the determined down-sampling ratio;
Encoding the downsampled digital video; and
Multiplexing the encoded digital video and transmitting it to the video receiver via the transmission network;
A digital video transmission method comprising:   Determining the downsampling ratio includes providing a user interface capable of inputting the downsampling ratio and related information; and determining the downsampling ratio according to information input through the user interface. 6. The method of claim 5, further comprising the steps of:   Determining the downsampling ratio comprises obtaining transmission network bandwidth information via input via a user interface or via communication with an external entity; and a table based on the obtained transmission network bandwidth information; The method of claim 5, further comprising: determining a downsampling ratio corresponding to the transmission network bandwidth information.   The method of claim 5, further comprising transmitting information on the downsampling ratio to the video receiver. A video reception and demultiplexing unit that receives digital video transmitted from a video transmission apparatus via a transmission network and information on a down-sampling ratio of the digital video and demultiplexes the received digital video ;
A decoding unit for decoding the demultiplexed digital video; and
A video interpolation unit that interpolates the decoded digital video based on a downsampling ratio of the digital video to restore a super-high-quality digital video;
A digital video receiving apparatus comprising:   The video reception and demultiplexing unit obtains information on a downsampling ratio of the digital video from at least one of a digital video packet and a specific signal transmitted from the video transmission device, and sends the information to the video interpolation unit. The digital video receiver according to claim 9, wherein the digital video receiver is transmitted.   The display device further includes an output unit that transmits the restored ultra-high-quality digital video to a display device, and the display device receives the super-high-quality digital signal through one of a progressive scan mode and an interlaced scan mode. The digital video receiver according to claim 9, wherein the video is displayed. Receiving digital video transmitted from a video transmission apparatus via a transmission network and information on a down-sampling ratio of the digital video;
Demultiplexing the received digital video;
Decoding the demultiplexed digital video; and
Interpolating the decoded digital video based on a downsampling ratio of the digital video to restore an ultra-high quality digital video;
A digital video receiving method comprising:   The digital signal according to claim 12, further comprising obtaining information of a downsampling ratio of the digital video from at least one of a digital video packet and a specific signal transmitted from the video transmission apparatus. Video reception method.   The method further includes transmitting the restored ultra-high-quality digital video to a display device, wherein the display device receives the ultra-high-quality digital video through one of a progressive scan mode and an interlaced scan mode. The digital video receiving method according to claim 12, wherein the digital video receiving apparatus is a device for displaying a video. Decide a downsampling ratio according to the bandwidth of the transmission network, downsample the ultra-high quality digital video according to the determined downsampling ratio, and encode the downsampled digital video And a video transmission device that multiplexes and transmits through the transmission network; and
Receiving and demultiplexing and decoding the digital video transmitted from the video transmitting device; receiving information about the downsampling ratio from the video transmitting device; and decoding the decoded digital based on the received information A digital video transmission / reception system comprising: a video receiving device that interpolates video to restore the super-high-quality digital video.

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