JP2016005264A - Video transmitter and video transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video transmitter which enables viewing a content etc. with a most suitable video setting without manual setting by a user, in a transmission/reception system which includes a video transmitter for transmitting a video and a video receiver for receiving and displaying the video.SOLUTION: A video transmitter (10) includes: a communication speed measurement unit (150) configured to be capable of measuring a communication speed with external equipment; a control unit (140) configured to be controllable of determining a coding method according to the content type of video data and the communication speed; a coding unit (110) configured to be capable of coding the video data to be transmitted to the external equipment, using the determined coding method; and a video data transmitter unit (121) configured to be capable of transmitting the coded video data to the external equipment.

Description

  One embodiment of the present invention relates to a video transmission device in a video transmission / reception system including a video transmission device that transmits video and a reception device that receives and displays video.

  In recent years, the content of the video content being played and the content displayed by the running software displayed on the display unit of a smartphone or tablet device has been sent to a receiving device with a display function, and the same content as the display unit on the transmission side There is a video transmission / reception system that displays a video on a receiving device. In such a video transmission / reception system, the transmission device side transmits video data in an encoded format, and the reception device side decodes the received encoded video data and displays the display unit. May be processed to display. In this case, when the data size per unit time of the video data transmitted from the transmission device side is larger than the data size per unit time capable of data transmission / reception between the transmission device and the reception device, the reception device Data per unit time is insufficient, causing problems such as dropping frames. In order to deal with such a problem, for example, Patent Document 1 discloses a technique for changing an encoding parameter with respect to a change in network bandwidth. Patent Document 2 discloses a technique for changing the bit rate of encoding in response to fluctuations in the bandwidth of a wireless network. Further, Patent Document 3 discloses a technique for avoiding the situation where the receiver side cannot output video in real time by transmitting the receiver performance to the transmitter.

JP 2011-109490 A JP 2011-9904 A JP 2003-259333 A

  However, in the above-described conventional technology, it has not been possible to view content or the like with optimal video settings without manual setting by the user. Further, the optimum data format for the content transmitted from the transmission device has not been determined.

  The present invention adopts the following means in order to solve the above problems. In the following description, in order to facilitate understanding of the invention, reference numerals and the like in the drawings are appended in parentheses, but each component of the present invention is not limited to these appendices. It should be construed broadly to the extent that contractors can technically understand.

Means 1 of the present invention include
A communication speed measuring unit (150) configured to be able to measure a communication speed with an external device;
An encoding method control unit (140) configured to be controllable to determine an encoding method according to the content type of video data and the communication speed;
An encoding unit (110) configured to be able to encode the video data to be transmitted to the external device by the encoding method;
A video transmission device (10) comprising: a video data transmission unit (121) configured to be capable of transmitting encoded video data to the external device.

Further, the means 4 of the present invention includes
Measuring a communication speed with an external device (S520);
Determining an encoding method according to the content type of the video data and the communication speed (S570);
Encoding the video data to be transmitted to the external device with the encoding method (S580);
And transmitting the encoded video data to the external device (S580).

  According to the video transmission apparatus or the video transmission method having the above configuration, it is possible to transmit video data encoded by an encoding method optimally determined according to the content type and communication speed of the video data. This makes it possible to select an optimal encoding method for the environment in which the video transmitting apparatus and the external device are arranged and the content being viewed, and the user can comfortably view the content.

Means 2 of the present invention
It is configured to be able to store transmitter performance information indicating the performance of the video transmission device set in advance and a weighting table indicating weights related to video parameters to be prioritized for each content type of the video data set in advance. A storage unit (nonvolatile memory 130);
A receiver performance information receiver (122) configured to be capable of receiving receiver performance information from the external device, and
The encoding method control unit (140)
The video transmission device (10) of the means 1 is configured to be able to determine a coding method of video data to be transmitted based on the transmitter performance information, the receiver performance information, and the weighting table. It is.

  According to the video transmission device having the above configuration, the transmitter performance information, the receiver performance information, and the weighting table are referred to in determining the encoding method, so that the decoding processing capability of the transmitter and the decoding processing of the receiver Video data can be encoded in consideration of the ability and points to be emphasized according to the type of video content.

Means 3 of the present invention
A communication state detection unit (170) configured to be able to detect a communication state with the external device;
The encoding method control unit (140) is configured to be controllable so as to dynamically change the encoding method of video data to be transmitted according to a communication state with the external device. 1 or means 2 video transmission device (10).

  According to the video transmission apparatus having the above configuration, even when the communication speed between the external device and the video transmission apparatus changes, it is possible to select the optimal encoding method and execute the encoding of the video data. .

The figure which shows the structural example of a video transmission apparatus. The figure which shows the structural example of a receiver. The flowchart which shows a video data transmission process. The figure which shows the specific example of the video image quality value and delay amount table | surface of a receiver. The figure which shows the specific example of a weighting table. The figure which shows the specific example of the image quality, transmission delay, and required bandwidth table | surface of a transmitter. The figure which shows the specific example of the image quality, transmission delay, and required bandwidth table | surface of a transmitter. The figure which shows the structural example of a 2nd video transmission apparatus. The flowchart which shows a communication status confirmation process.

An embodiment according to the present invention will be specifically described according to the following configuration with reference to the drawings. However, the embodiment described below is merely an example of the present invention and does not limit the technical scope of the present invention. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and the description may be abbreviate | omitted.
1. Embodiment 1
(1) Configuration example of video transmission device (2) Configuration example of reception device (3) Specific example of video data transmission processing Embodiment 2
(1) Configuration example of video transmission device (2) Specific example of communication status confirmation processing Embodiment 3
4). Supplementary items 5. Features of the present invention

<1. Embodiment 1>
First, Embodiment 1 of the present invention will be described with reference to FIGS.

  The video transmission / reception system of the present embodiment includes a video transmission device configured to transmit video data and a reception device configured to receive and display video data. The video transmission device is an electronic device such as a smartphone, a tablet device, or an STB (Set Top Box), and the reception device is a display device such as a television or a monitor. This video transmission / reception system is a system that enables a user to view video content transmitted from a video transmission device or display contents such as a game on a television or a monitor.

<(1) Configuration Example of Video Transmission Device>
FIG. 1 is a diagram illustrating a configuration example of a video transmission device in the video transmission / reception system of the present embodiment. As shown in FIG. 1, the video transmission apparatus 10 according to the present embodiment includes a CPU 100, an encoding unit 110, a Wi-Fi communication unit 120, a nonvolatile memory 130, an encoding method control unit 140, and a communication speed measurement unit 150. Consists of including. Each of these elements is configured to be able to execute data input / output via the bus 160. As described above, the video transmission device is, for example, a smartphone, a tablet device, or an STB. The video transmission apparatus may include other configurations such as a display unit (not shown).

<CPU 100>
The CPU 100 is a central processing unit configured to be able to execute various processes in the video transmission device 10, and includes an encoding unit 110, a Wi-Fi communication unit 120, a nonvolatile memory 130, an encoding method control unit 140, and communication. The speed measurement unit 150 is configured to be controllable via the bus 160. The CPU 100 is configured to be able to execute various processes based on the operation by the user, the execution result of the software being executed, and the received signal from the Wi-Fi communication unit 120.

<Encoding unit 110>
The encoding unit 110 is configured to be able to encode video data to be transmitted to the receiving device 20 based on the encoding method specified by the encoding method control unit 140. The encoding unit 110 is, for example, H.264. H.264, or H.264. The video data can be encoded by an encoding method such as H.265. The encoding unit 110 is configured to be able to output the encoded video data to the video data transmission unit 121 for transmission from the video data transmission unit 121 to the reception device 20.

<Wi-Fi communication unit 120>
The Wi-Fi communication unit 120 is configured to be able to perform data transmission / reception with an external device (including the reception device 20), and includes a video data transmission unit 121 and a receiver performance reception unit 122. Is done.

<Video data transmission unit 121>
The video data transmission unit 121 is configured to receive the video data encoded by the encoding unit 110 and to transmit the video data to the reception device 20 wirelessly by Wi-Fi communication.

<Receiver performance receiver 122>
The receiver performance receiving unit 122 is configured to be able to receive receiver performance information indicating the performance of the receiver transmitted from the receiving device 20. The receiver performance receiving unit 122 is configured to be able to output the received receiver performance information to the encoding method control unit 140.

<Nonvolatile memory 130>
The nonvolatile memory 130 is a memory that can retain information without being erased even when the supply of power to the video transmission device 10 is stopped, and is configured to be able to store at least transmitter performance information and a weighting table. . The transmitter performance information is information indicating the performance of the video transmission apparatus 10 functioning as a video data transmitter, and indicates information indicating a transmission delay, a necessary bandwidth, and the like for each video system to be encoded. The weighting table is information indicating the weighting related to the video parameter to be prioritized for each content type of video data to be transmitted. That is, it is information indicating weights determined in advance regarding which of the image quality, the frame rate, and the transmission delay is prioritized when moving image reproduction such as a movie or image data such as an action game is transmitted. Details and utilization of these pieces of information stored in the nonvolatile memory 130 will be described later.

<Encoding method control unit 140>
The encoding method control unit 140 is employed by the encoding unit 110 based on the content type of video data to be transmitted to the receiving device, the communication speed with the receiving device, transmitter performance information, receiver performance information, and a weighting table. It is configured to be controllable so as to determine the encoding method. In other words, when the communication speed with the receiving device is slow, it is necessary to reduce the amount of video data to be transmitted. However, the encoding method control unit 140 sacrifices parameters to be prioritized for each content type of video data. The encoding method that can effectively reduce the amount of data is determined. That is, the encoding unit 110 determines how much of the resolution, the frame rate, and the transmission delay is sacrificed under a limited communication speed.

<Communication speed measurement unit 150>
The communication speed measurement unit 150 is configured to be able to measure the communication speed between the video transmission device 10 and the reception device 20. Information on the measured communication speed is output to the encoding method control unit 140.

<Bus 160>
The bus 160 is connected to each element included in the video transmission device 10, and each of these elements is used to execute transmission / reception of data with each other.

<(2) Configuration example of receiving device>
FIG. 2 is a diagram illustrating a configuration example of a receiving device in the video transmission / reception system of the present embodiment. As illustrated in FIG. 2, the reception device 20 according to the present embodiment includes a CPU 200, a decryption unit 210, a Wi-Fi communication unit 220, a nonvolatile memory 230, and a display unit 270. Each of these elements is configured to be able to execute data input / output via the bus 260. The receiving device 20 is a television, for example. In addition, although the receiving apparatus 20 of this embodiment is comprised including the decoding part 210 and the display part 270, these elements do not necessarily need to be contained in one apparatus. That is, the reception apparatus 20 may be configured by a combination of an STB including the encoding unit 110 and a monitor including the display unit 270.

<CPU 200>
The CPU 100 is a central processing unit configured to be able to execute various processes in the video transmission apparatus 10, and the decoding unit 210, the Wi-Fi communication unit 220, the nonvolatile memory 230, and the display unit 270 are connected via the bus 260. And can be controlled. The CPU 100 is configured to be able to execute various processes based on the operation by the user, the execution result of the software being executed, and the received signal including the video data received by the Wi-Fi communication unit 220.

<Decoding unit 210>
The decoding unit 210 is configured to be able to decode the encoded video data received by the Wi-Fi communication unit 220. The decoded video data is output to the display unit 270 and displayed so as to be visible to the user who views the receiving device 20. The encoded video data is uncompressed image data that is continuous in time.

<Wi-Fi communication unit 220>
The Wi-Fi communication unit 220 is configured to be able to execute data transmission / reception with an external device (including the video transmission device 10), and includes a video data reception unit 221 and a receiver performance transmission unit 222. Composed.

<Video data receiving unit 221>
The video data receiving unit 221 is configured to receive the encoded video data transmitted from the video data transmitting unit 121 of the video transmitting apparatus 10 wirelessly via Wi-Fi communication and to output the video data to the decoding unit 210. Is done.

<Receiver performance transmitter 222>
The receiver performance transmitter 222 is configured to be able to transmit receiver performance information indicating the performance of the receiver 20 stored in the nonvolatile memory 230.

<Nonvolatile memory 230>
The non-volatile memory 230 is a memory that can retain information without being erased even when the supply of power to the receiving device 20 is stopped, and is configured to store at least receiver performance information. The receiver performance information is information indicating the performance of the receiving device 20 that functions as a receiver of video data. For example, for each encoded video format, a display delay indicating a time required for decoding and display, and This refers to information indicating the displayed image quality. Details and utilization of these pieces of information stored in the nonvolatile memory 230 will be described later.

<Bus 260>
The bus 260 is connected to each element included in the reception device 20, and each of these elements is used to execute transmission / reception of data with each other.

<Display unit 270>
The display unit 270 is configured by an LCD (Liquid Crystal Display), an organic EL display, or the like, and is configured to be able to display the video data decoded by the decoding unit 210 while being visible to the user.

<(3) Specific example of video data transmission processing>
FIG. 3 is a flowchart showing the contents of the video data transmission process executed by the video transmission apparatus 10. As will be described in detail below, the video transmission device 10 transmits video data encoded by a predetermined encoding method determined based on the content type of the video data to be transmitted.

<S500 to S510>
When the video data transmission process is started in the video transmission device 10 (S500), the video transmission device 10 requests receiver performance information from the reception device 20. In response to this request, in the receiver 20, the receiver performance transmitter 222 acquires receiver performance information from the nonvolatile memory 230 and transmits it to the video transmitter 10. The receiver performance receiving unit 122 of the video transmitting apparatus 10 receives the receiver performance information and outputs it to the encoding method control unit 140 (S510).

  FIG. 4 is a diagram showing a specific example of a video image quality value / delay amount table of the receiver showing the receiver performance information. As shown in FIG. 4, the video image quality value / delay amount table as the receiver performance information shows the display delay and decode (decode) image quality generated for each input content information. The display delay indicates the time required from the input of video data to the display. The decoded image quality is shown as a relative level of the image quality displayed on the display unit 270. For example, in setting 1, the input content is 720 × 480 screen size progressive (P), 60 fps (frame / second), and H.264. In the case of H.264 video data, a delay of 15 ms occurs from data input to display, and the relative image quality is “4”. In setting 8, the input content is 1920 × 1080 screen size interlace method (I), 60 fps and H.264. In the case of H.265 video data, there is a 65 ms delay from data input to display, and the relative image quality is “6”. Here, the setting 6 of 1360 × 768 (P) at 60 fps The image of the H.265 video data has the highest image quality “10” because the display unit 270 is composed of 1360 × 768 pixels.

<S520>
Next, the communication speed measurement unit 150 of the video transmission device 10 measures the communication speed between the video transmission device 10 and the reception device 20 (S520). For example, the communication speed is measured by transmitting a predetermined amount of data from the Wi-Fi communication unit 120 of the video transmission device 10 to the Wi-Fi communication unit 220 of the reception device 20 and detecting the reception completion time of this data. It is possible to measure by doing. Note that various methods that are generally employed can be applied to the measurement of the communication speed.

<S530>
Next, the CPU 100 of the video transmission device 10 determines the content type of the video data to be transmitted (S530). Specifically, what is transmitted from the video transmission device 10 to the reception device 20 and displayed on the reception device 20 is content centering on text information such as contents of emails and chats, movies, etc. It is determined whether the content is a video playback content or whether a papermaking such as a photo is a playback content.

  There are various methods for discriminating the content type of the video data here, and a characteristic example of the present invention will be described. In the determination of the content type in the present invention, the category name classified in the service to which the content is distributed is used for the software executed by the CPU 100 or the content to be reproduced. As the category name, for example, a category name such as RPG, SLG, or action game can be considered. Alternatively, it is possible to determine the content type based on a keyword included in the description text of the content of the reproduction content distribution service. For example, the content type is determined in accordance with the ratio of the content description text including specific keywords such as “action”, “beautiful graphic”, and “timing”. It is also possible to determine the content type based on the user's operation frequency and operation details for the content being executed. For example, when the user frequently performs a tap operation and the video transitions in response to the tap operation, it is possible to determine the content type such as playing a highly actionable game. Note that the content type determination process may be performed by a method other than the above.

<S540>
Next, the encoding method control unit 140 of the video transmission apparatus 10 reads the weighting table from the nonvolatile memory 130 (S540).

  FIG. 5 shows a specific example of the weighting table read out here. As shown in FIG. 5, the weighting table shows weighting for each of image quality (resolution), frame rate, and transmission delay associated with each content type. The content types stored here include, for example, content centered on character information such as e-mail and chat content, video playback content, photo / still image playback content, action game content, and RPG (role playing). Game) and SLG (simulation game).

  As an example of weighting, content such as e-mail and chat that is centered on text information has little effect even if the display timing is delayed, so the frame rate and transmission delay are less important, so the image quality (resolution) is relatively low. It is preferable to increase the weight of. In the action game, it is preferable that the frame rate and the transmission delay are weighted higher and the image quality (resolution) weight is relatively lower in order to make the user's operability comfortable. In this way, image quality (resolution), frame rate, and transmission delay weighting are set for each content type.

<S550>
Next, the encoding method control unit 140 determines which content type is to be used based on the read weighting table (S550).

<S560>
Next, the encoding method control unit 140 reads transmitter performance information from the nonvolatile memory 130 (S560).

  6 and 7 are diagrams illustrating specific examples of the video image quality / video delay / required bandwidth table of the transmitter, showing the transmitter performance information. As shown in FIG. 6 and FIG. 7, the video quality / video delay / required bandwidth table as transmitter performance information includes a delay, an encoding quality, and an encoding quality for each encoding (Encode) output setting. The required bandwidth is shown. An encoding method is assigned to each encoding output setting. The video image quality / video delay / required bandwidth table includes the delay time until output, the encoded image quality (image quality of the encoded video), and the required communication speed when each encoding method is adopted. Each required bandwidth is shown. FIG. 6 shows a video image quality / video delay / required bandwidth table when the content to be encoded is 1920 × 1080 (P), 60 fps uncompressed video. For example, in setting 1 shown in FIG. 6, the encoding method is a progressive method (P) with a screen size of 720 × 480, and H.264 at 60 fps. In the case of H.264, the delay time until encoding is 15 ms, the relative image quality is 0.28, and the necessary communication speed (required bandwidth) is 2.5 Mbps.

  FIG. 7 differs from FIG. 6 in that the content to be encoded is 720 × 480 (P), 60 fps H.264. A video quality / video delay / required bandwidth table in the case of H.265 video is shown. For example, in setting 2 illustrated in FIG. 7, the encoding method is 720 × 480 (P), and the H.P. In the case of H.265, since the content is the same as the content to be encoded, an example in which the delay time is 0 is shown.

<S570>
Next, the encoding method control unit 140 uses the encoding unit 110 according to the content type, the communication speed with the receiving device 20, the transmitter performance information, the receiver performance information, and the weighting determined in the above processing. Determine the encoding method to be adopted. Specifically, it is determined that an encoding method (encoding output setting) that can be transmitted can be selected according to the communication speed with the receiving device 20. Next, among these selectable encoding methods, an encoding method is determined in consideration of items to be prioritized and items that can be compromised according to the weighting determined for the content type (S570). At this time, the total delay time required for transmission / reception of the video data is derived from the sum of the display delay of the reception device 20 and the delay of the video transmission device 10. Further, the image quality of the video data is derived by the product of the values of the encoded image quality and the decoded image quality. For example, when the video data to be transmitted is an action game video, it is decided to adopt an encoding method capable of transmission at 60 fps so that the delay time between the reception device 20 and the video transmission device 10 is sufficiently small. To do.

<S580>
Next, based on the encoding method (encoding method) determined by the encoding method control unit 140, the encoding unit 110 encodes the video data to be transmitted to the receiving device 20. The encoding unit 110 outputs the encoded video data to the video data transmission unit 121. Then, the video data transmitting unit 121 transmits the encoded video data to the receiving device 20 (S580).

<S590>
When video data is transmitted from the video transmission device 10 to the reception device 20 by the above processing, the video data transmission processing is terminated (590).

  In the video transmission / reception system including the video transmission device 10 and the reception device 20 configured as described above, the video data transmission process is executed, so that the reception device 20 can display desired video content. Become.

<2. Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. In the video transmission / reception system of this embodiment, the configuration of the video transmission device 10 is different from that in the first embodiment. And due to the difference in configuration, a communication confirmation process for confirming the communication state is added. In the following description, the difference in configuration from the first embodiment and the communication confirmation process added in the present embodiment will be mainly described, and the description of the same contents as those in the first embodiment will be omitted.

<(1) Configuration Example of Video Reception Device>
The video transmission apparatus 10 includes a CPU 100, an encoding unit 110, a Wi-Fi communication unit 120, a nonvolatile memory 130, an encoding method control unit 140, a communication speed measurement unit 150, and a communication state detection unit 180. . That is, as compared with the video transmission device 10 of the first embodiment, the video transmission device 10 of the present embodiment includes a communication state detection unit 180 as an additional configuration.

<Communication state detection unit 180>
The communication state detection unit 180 is configured to be able to detect the communication state between the video transmission device 10 and the reception device 20. Here, the communication state detected by the communication state detection unit 180 includes a decrease in communication speed due to the communication environment, dropped frames of video data decoded by the receiving device 20 (video data shortage), and the like.

<(2) Specific example of communication status confirmation process>
Next, the communication status confirmation process in this embodiment will be described. The communication state confirmation process is a process for dynamically changing the encoding method when the communication state changes after the encoding method is determined in the video data transmission process in the first embodiment.

<S600 to S610>
When the communication state confirmation process is started in the video transmission device 10 (S600), the communication state detection unit 180 periodically confirms the communication state (for example, every 5 seconds) and determines whether or not a communication error has occurred. Is confirmed (S610). The communication error here is not only a defect in data transmitted / received between the video transmitting apparatus 10 and the receiving apparatus 20 but also a defect caused by a communication error such as dropped frames of video data decoded by the receiving apparatus 20. including.

<S620>
When a communication error has occurred (Y in S610), the communication speed measurement unit 150 measures the communication speed between the video transmission device 10 and the reception device 20. Then, according to the measured communication speed, the content type of the video data to be transmitted to the receiving device 20, the transmitter performance information, the receiver performance information, and the weighting table, the encoding method to be applied by the encoding unit 110 is further determined. The encoding method is changed to an appropriate encoding method (S620).

<S690>
In this way, when the encoding method is changed to the encoding method corresponding to the changed communication speed, the video transmitting apparatus 10 ends the communication state confirmation process (S690).

<3. Embodiment 3>
Next, a third embodiment of the present invention will be described. The present embodiment is characterized in the content type determination (S530) processing in the video data transmission processing of the first embodiment. In the following description, the content type determination process will be specifically described.

  In the content type determination process of the present embodiment, the content type is determined based on the content of the video to be transmitted by the video transmission device 10.

  For the content of the video to be transmitted, the CPU 100 (1) has a large amount of change before and after the frame and includes audio data, and (2) has a small amount of change before and after the frame. If there is no data, it is determined that the content is a still image (photo) playback content, and (3) character content if there are many locations where the difference in brightness (contrast) between the X and Y directions of the image is large. That is, the content type is determined based on the time change in each part of the video, the presence / absence of audio, and the luminance difference of the image.

<4. Supplementary items>
The specific description of the embodiment of the present invention has been given above. The above description is merely an embodiment, and the scope of the present invention is not limited to this embodiment, but should be broadly interpreted to the extent that a person skilled in the art can grasp.

  In the above embodiment, the video transmission device 10 and the reception device 20 are directly connected, but may be connected via a device such as a wireless router.

<5. Features of the present invention>
The video transmission apparatus 10 or the video transmission method configured as described above has the following characteristics.

  The video transmission device (10) of the present invention is configured according to the communication speed measurement unit (150) configured to be able to measure the communication speed with the external device (reception device 20), the content type of the video data, and the communication speed. The encoding method control unit (140) configured to be controllable to determine the encoding method, and the video data to be transmitted to the external device (receiving device 20) can be encoded using the determined encoding method. And a video data transmission unit (121) configured to be able to transmit video data encoded to an external device (reception device 20).

  In the video transmission method of the present invention, the step of measuring the communication speed with the external device (receiving device 20) (S520), and the step of determining the encoding method according to the content type and communication speed of the video data. (S570), a step (S580) of encoding the video data to be transmitted to the external device (reception device 20) by the determined encoding method, and the transmission of the video data encoded to the external device (reception device 20). (S580).

  According to the video transmission apparatus or the video transmission method having the above configuration, it is possible to transmit video data encoded by an encoding method optimally determined according to the content type and communication speed of the video data. This makes it possible to select an optimal encoding method for the environment in which the video transmitting apparatus and the external device are arranged and the content being viewed, and the user can comfortably view the content.

  In addition, the video transmission device (10) of the present invention provides a video to be prioritized for each of the transmitter performance information indicating the performance of the video transmission device set in advance and the content type of the video data set in advance. A storage unit (non-volatile memory 130) configured to be able to store a weighting table indicating weights related to parameters, and a receiver performance information receiving unit configured to be able to receive receiver performance information from an external device (receiving device 20) ( 122), and the encoding method control unit (140) is configured to be able to determine the encoding method of the video data to be transmitted based on the transmitter performance information, the receiver performance information, and the weighting table. It is characterized by being.

  According to the video transmission device having the above configuration, the transmitter performance information, the receiver performance information, and the weighting table are referred to in determining the encoding method, so that the decoding processing capability of the transmitter and the decoding processing of the receiver Video data can be encoded in consideration of the ability and points to be emphasized according to the type of video content.

  The video transmission device (10) of the present invention further includes a communication state detection unit (170) configured to be able to detect a communication state with an external device (reception device 20), and an encoding method control unit (140). Is configured to be controllable so as to dynamically change the encoding method of video data to be transmitted in accordance with the communication state with the external device (reception device 20).

  According to the video transmission apparatus having the above configuration, even when the communication speed between the external device and the video transmission apparatus changes, it is possible to select the optimal encoding method and execute the encoding of the video data. .

  The present invention is suitably applied as a video transmission device in a video transmission / reception system including a video transmission device that transmits video and a reception device that receives and displays video.

DESCRIPTION OF SYMBOLS 10 ... Video transmission apparatus 110 ... Encoding part 120 ... Communication part 121 ... Video data transmission part 122 ... Receiver performance reception part 130 ... Non-volatile memory 140 ... Coding method control part 150 ... Communication speed measurement part 160 ... Bus 180 ... Communication state detection unit 20 ... receiving device 210 ... decoding unit 220 ... communication unit 221 ... video data reception unit 222 ... receiver performance transmission unit 230 ... nonvolatile memory 260 ... bus 270 ... display unit

Claims (4)

A communication speed measuring unit configured to measure a communication speed with an external device;
An encoding method control unit configured to be controllable to determine an encoding method according to a content type of video data and the communication speed;
An encoding unit configured to be able to encode the video data to be transmitted to the external device by the encoding method;
A video data transmission unit configured to transmit the encoded video data to the external device. It is configured to be able to store transmitter performance information indicating the performance of the video transmission device set in advance and a weighting table indicating weights related to video parameters to be prioritized for each content type of the video data set in advance. Storage unit,
A receiver performance information receiver configured to be capable of receiving receiver performance information from the external device; and
The encoding method control unit includes:
The video transmission apparatus according to claim 1, wherein a video data encoding method to be transmitted can be determined based on the transmitter performance information, the receiver performance information, and the weighting table. . A communication state detection unit configured to be able to detect a communication state with the external device;
The encoding method control unit is configured to be controllable so as to dynamically change an encoding method of video data to be transmitted in accordance with a communication state with the external device. The video transmission apparatus according to claim 2. Measuring the communication speed with an external device;
Determining an encoding method according to a content type of video data and the communication speed;
Encoding the video data to be transmitted to the external device with the encoding method;
Transmitting the encoded video data to the external device. A video transmission method comprising:

Images