JP2008244820A - Video display system and video output device - Google Patents

Abstract

A video display system capable of distributing a load of frame interpolation processing based on a communication state between a video output device and a video reproduction device.
In a video display system, a video output device 2 for outputting a video signal and a video playback device 3 for reproducing a video signal from the video output device 2 are connected via a network. The video output device 2 and the video playback device 3 include interpolation frame information generation units 22 a and 32 c that generate interpolation frame information based on two adjacent frames of the video signal. The video output device 2 is the video output device 2. And a communication state monitoring unit 22d for monitoring the communication state between the video reproduction device 3 and a condition for determining which one of the video output device 2 and the video reproduction device 3 generates the interpolation frame information based on the communication state between the devices And a determination unit 22c.
[Selection] Figure 3

Description

  The present invention relates to a video display system and a video output device that display a frame-interpolated video, and more specifically, a video display system that can distribute the load of frame interpolation processing between the video output device and the video playback device, and The present invention relates to a video output device.

  Recently, video playback devices that do not have a tuner function, such as portable terminals, and video output devices that have a tuner function and an Internet connection function are connected via a wireless LAN or the Internet, and video signals are transferred from the video output device to the video playback device. Thus, there is known a television viewing system that allows a video playback device to view television in real time. This television viewing system is called location-free (registered trademark), and is spreading to ordinary households.

  In this television viewing system, a video output device converts a video signal of a television broadcast or the like into MPEG-4 or MPEG-2 in real time and transmits it as an IP packet to a video playback device. MPEG-4 is a moving picture coding system mainly for portable terminals, and therefore has a lower bit rate and lower resolution than MPEG-2. In view of this, when trying to view a moving image of MPEG-4 with higher image quality, a method such as performing frame interpolation to increase the number of frames can be considered.

  In general, the frame interpolation method is intended to increase the number of display frames per time by interpolating an interpolation frame between two adjacent frames with respect to a moving image signal composed of a plurality of frames. Thereby, since time resolution improves, the moving image quality in a display device such as a liquid crystal display (LCD) can be improved.

  In the above, in order to generate an interpolated frame, interpolated frame information such as difference information between two adjacent original frames is required. Interpolated frame information is generated.

  That is, the video reproduction device generates interpolation frame information from two adjacent original frames of the video signal received by the video output device, and generates an interpolation frame based on the interpolation frame information and the two original frames. Then, an interpolation frame is inserted between the two current frames to display the video.

FIG. 21 is a diagram for explaining frame interpolation processing by a video output device and a video playback device that constitute a conventional video display system, in which 200 indicates a video output device and 300 indicates a video playback device.
FIG. 22 is a block diagram showing a configuration of the conventional video display system shown in FIG. The video output device 200 includes a video reception unit 201 and a communication unit 202, and the video reproduction device 300 includes a communication unit 301, an interpolation frame information generation unit 302, a display unit 303, and an interpolation frame generation unit 304.

21 and 22, in the video output device 200, when the video receiving unit 201 receives a video signal, a control unit (not shown) decodes the video signal and extracts a plurality of original frames 101 ₁ , 101 ₂ ,. Then, the communication unit 202 transmits these original frames 101 ₁ , 101 ₂ ,... To the video reproduction device 300.

When the communication unit 301 receives the original frames 101 ₁ , 101 ₂ ,... Transmitted from the video output device 200, the video reproduction device 300 receives the interpolated frame information generation unit 302 from two adjacent original frames 101 ₁ , 101 _2. Interpolation frame information 102 such as difference information necessary for generating an interpolation frame is generated. The interpolation frame generation unit 304 generates the interpolation frame 103 based on the interpolation frame information 102 and the two frames 101 ₁ and 101 ₂ . Then, the display unit 303 displays and outputs the video 100 including the _two frames 101 ₁ and 101 ₂ and the interpolation frame 103.
JP 2006-33219 A

  In the conventional system shown in FIGS. 21 and 22, when frame interpolation processing is executed, interpolation frame information is always generated on the video playback device side, and an interpolation frame is generated based on this interpolation frame information. However, when the communication state between the video output device and the video playback device is good, when the processing capability of the video playback device (for example, the performance of the CPU) is low, or when the battery of the video playback device is low, It is not always efficient to generate interpolation frame information on the video playback device side.

  For example, if the video playback device is a portable terminal, it is considered that the processing capability of the video output device is usually higher than the processing capability of the portable terminal. Therefore, if the communication state between the two is good, it is more efficient to generate the interpolated frame information with a video output device having a high processing capability. Conversely, when the communication state between the two is poor, it is preferable to reduce the amount of data transmitted from the video output device as much as possible. Therefore, it may be more efficient to generate the interpolation frame information in the video playback device.

  As described above, in the video output device and the video playback device, it is effective for performing efficient processing to distribute the load of the frame interpolation processing according to the communication state between the devices. The idea has never been realized.

  The present invention has been made in view of the above circumstances, and in a video display system including a video output device and a video playback device, the communication state between the devices, the processing capability of the video playback device, the remaining battery level, etc. Based on the above, it is an object to provide a video display system and a video output device capable of distributing the load of the frame interpolation processing.

  In order to solve the above problems, a first technical means of the present invention is that a video output device that outputs a video signal and a video playback device that reproduces a video signal from the video output device are connected via a network. In the video display system, the video output device and the video playback device include an interpolation frame information generation unit that generates interpolation frame information based on the video signal, and the video output device and / or the video playback device are included in the video playback device. A condition determination unit that determines which of the video output device and the video playback device generates the interpolated frame information based on the predetermined condition is provided.

  According to a second technical means, in the first technical means, the condition determining unit includes a communication state monitoring unit that monitors a communication state between the video output device and the video reproduction device, and the video output monitored by the communication state monitoring unit. It is characterized in that it is determined which of the video output device and the video playback device generates the interpolation frame information based on the communication state between the device and the video playback device.

  According to a third technical means, in the second technical means, the condition determination unit determines that the interpolated frame information is generated on the video output device side when the communication state is good, and the video reproduction device when the communication state is bad. It is characterized in that it is determined that interpolation frame information is generated on the side.

  According to a fourth technical means, in the third technical means, the video output device reduces the number of frames of the video signal when the communication state is poor.

  According to a fifth technical means, in the first technical means, the condition determination unit includes a capability information acquisition unit that acquires information related to the processing capability of the video playback device, and the video playback device acquired by the capability information acquisition unit Based on the processing capability, it is determined which of the video output device and the video playback device generates the interpolation frame information.

  According to a sixth technical means, in the fifth technical means, the condition determination unit determines that the interpolated frame information is generated on the video reproduction device side when the processing capability of the video reproduction device is equal to or higher than a predetermined level. When the processing capability is less than a predetermined level, the video output device side determines to generate interpolation frame information.

  A seventh technical means is the sixth technical means, wherein the video output device reduces the number of frames of the video signal when the processing capacity of the video reproduction device is equal to or higher than a predetermined level.

  According to an eighth technical means, in the first technical means, the condition determination unit includes a battery remaining amount monitoring unit that monitors a remaining battery level of the video reproduction device when the video reproduction device includes a battery, Based on the remaining battery level of the video playback device monitored by the monitoring unit, it is determined whether the video output device or the video playback device generates the interpolation frame information.

  According to a ninth technical means, in the eighth technical means, the condition determination unit determines that the interpolated frame information is generated on the video reproduction device side when the battery remaining amount of the video reproduction device is equal to or higher than a predetermined level, and the video reproduction device When the remaining battery level is less than a predetermined level, the video output device side determines to generate interpolation frame information.

  A tenth technical means is the ninth technical means, wherein the video output device reduces the number of frames of the video signal when the remaining battery level of the video reproducing device is equal to or higher than a predetermined level.

  According to an eleventh technical means, in any one of the fourth, seventh and tenth technical means, the video output device generates interpolation frame information for generating a reduced frame from the video signal from the remaining frames of the video signal. It is characterized by doing.

In a twelfth technical means according to any one of the first to eleventh technical means, the video reproduction device includes an input unit that inputs and designates the number of generated interpolation frames to the video output device,
The interpolation frame information generation unit of the video output device generates interpolation frame information corresponding to the number of interpolation frames specified from the input unit.

  A thirteenth technical means according to any one of the first to eleventh technical means is characterized in that the interpolation frame information generation unit generates interpolation frame information based on two adjacent frames of the video signal. is there.

  A fourteenth technical means is that in the thirteenth technical means, the video reproduction device comprises two adjacent frames based on two adjacent frames and interpolation frame information generated by the video output device or the video reproduction device. An interpolation frame generation unit that generates an interpolation frame to be inserted therebetween is provided.

  According to a fifteenth technical means, in the technical means according to any one of the first to eleventh technical aspects, the video reproduction apparatus includes an input unit for a user to input and designate a condition determined by the condition determining unit. It is characterized in that it is determined which of the video output device and the video playback device generates the interpolated frame information based on the determination condition designated by the unit.

  According to a sixteenth technical means, in the first technical means, when the interpolation frame information is generated by both the video output device and the video reproduction device, the interpolation frame information generation unit of the video output device starts from a part of the frame of the video signal. The interpolation frame information is generated, and the interpolation frame information generation unit of the video reproduction device generates the interpolation frame information from the remaining frames of the video signal.

  A seventeenth technical means is a video output device connected via a network to a video playback device capable of generating interpolation frame information based on a video signal, wherein the interpolation frame generates interpolation frame information based on the video signal An information generation unit, and a condition determination unit that determines which of the video output device and the video playback device generates the interpolation frame information based on a predetermined condition relating to the video playback device. .

  According to the present invention, in a video display system including a video output device and a video playback device, the frame interpolation processing load is distributed based on the communication status between the devices, the processing capability of the video playback device, the remaining battery level, and the like. Therefore, the frame interpolation process can be efficiently executed according to the status of the apparatus.

  Hereinafter, preferred embodiments of a video display system and a video output device of the present invention will be described with reference to the accompanying drawings. In the drawings, portions having the same function are denoted by the same reference numerals, and repeated description is omitted. The frame signal to which the present invention is applied includes field signals having a similar relationship to each other.

  FIG. 1 is a diagram showing a configuration example of a video display system according to an embodiment of the present invention, in which 1 denotes a television device, 2 denotes a video output device, 3 denotes a video playback device, and 4 denotes a network. In the video display system of the present invention, the video output device 2 and the video playback device 3 are connected via the network 4, and as predetermined conditions related to the video playback device 3, for example, the communication state between the devices, the video playback device 3, the load of the frame interpolation process is distributed based on the processing capacity 3 and the remaining battery level. Specifically, interpolation frame information can be generated by both the video output device 2 and the video reproduction device 3, and a device that generates the interpolation frame information is adaptively determined based on a communication state between the devices.

  In FIG. 1, the video display system is, for example, the network 4 is the Internet, the video output device 2 is a recorder, and the video playback device 3 is a mobile terminal (such as a mobile phone or a PDA). As a viewing mode to which the present invention can be applied, for example, a recorder installed in a home receives a video signal such as a television broadcast, and transfers the video signal to a mobile terminal via the Internet in real time. Then, the user reproduces / views the video signal transferred from the recorder using the portable terminal. Alternatively, the present invention can also be applied to a case in which after a video signal is recorded on a hard disk or the like of a recorder, the recorded video is transferred from the recorder to the portable terminal at a user-desired timing and played back / viewed on the portable terminal.

  When the data formats handled by the video output device 2 and the video playback device 3 are different, for example, when the video output device 2 is compatible with MPEG-2 and the video playback device 3 is compatible with MPEG-4, the video output device 2 is The video signal may be converted into a data format that can be played back by the video playback device 3. Further, the video output device 2 may include a 1 segment tuner or the like and receive a video signal that can be played back by the video playback device 3. Alternatively, the video reproduction device 3 may convert the video signal into a data format that can be reproduced by itself.

  Note that the input source when the video output device 2 captures the video signal is not limited to an analog tuner or a digital tuner, for example, and may be an internal recording medium such as a built-in hard disk or a DVD.

(First embodiment)
FIG. 2 is a diagram for explaining an example of frame interpolation processing by the video output device and the video playback device that constitute the video display system according to the first embodiment of the present invention. In the present embodiment, the video output device 2 monitors the communication state with the video playback device 3.

  As shown in FIG. 2A, when the communication state between the devices is poor, it is possible to reduce the communication load by reducing the data transmission amount from the video output device 2 as much as possible. Are generated, and only the original frame 101 which is an adjacent frame is transmitted to the video reproduction apparatus 3. When receiving the original frame 101, the video reproduction device 3 generates interpolation frame information from the original frame 101, and generates an interpolation frame based on the interpolation frame information and the original frame 101.

  On the other hand, as shown in FIG. 2B, when the communication state between the devices is good, the video output device 2 generates the interpolation frame information 102, and the interpolation frame information 102 and the original frame 101 are converted into the video reproduction device 3. Send to. When receiving the original frame 101 and the interpolation frame information 102, the video reproduction device 3 generates an interpolation frame based on the original frame 101 and the interpolation frame information 102.

  FIG. 3 is a block diagram illustrating a configuration example of the video display system illustrated in FIG. The video output device 2 receives a tuner (video receiving unit) 21 that receives a television broadcast signal (video signal), a control unit 22 that includes a CPU that controls the operation of the device, and video data such as a television program. An HDD (hard disk drive) 23 for recording, a memory 24 for storing a control program for controlling the operation of the apparatus, and a communication unit 25 for connecting to the video reproduction apparatus 3 via the network 4 are provided. . Further, the control unit 22 decodes the video signal received by the tuner 21, and generates an interpolation frame information generation unit 22a that generates interpolation frame information from the decoded video signal, an encoder 22b that re-encodes the decoded video signal, and video playback A condition determination unit 22c that determines which of the video output device 2 and the video playback device 3 generates the interpolation frame information based on a predetermined condition relating to the device 3 is provided.

  For example, the interpolated frame information generation unit 22a may generate interpolated frame information from two adjacent frames of the video signal, but the number of frames necessary for generating the interpolated frame information is not limited to two adjacent frames. Any frame may be used as long as it is an image format that can generate an interpolation frame from one frame.

  The video output device 2 may transmit the original frame decoded by the interpolation frame information generation unit 22a to the video reproduction device 3 as it is, or may re-encode and transmit the original frame by the encoder 22b. You may do it. When the original frame is transmitted as it is, it is not necessary to encode, so the encoder 22b may be deleted from the configuration.

  In the case of this embodiment, the condition determination unit 22c includes a communication state monitoring unit 22d that monitors a communication state with the video reproduction device 3. The condition determination unit 22c generates interpolation frame information in either the video output device 2 or the video playback device 3 based on the communication status between the video output device 2 and the video playback device 3 monitored by the communication status monitoring unit 22d. To determine.

  More specifically, the condition determination unit 22c determines that the video output device 2 generates the interpolation frame information when the communication state monitored by the communication state monitoring unit 22d is good. It is determined that the playback device 3 generates interpolation frame information.

  The condition determination unit 22c may be provided on the video playback device 3 side, or may be provided on both the video output device 2 and the video playback device 3. When the condition determination unit 22c is provided in the video reproduction device 3, the determination result is notified from the video reproduction device 3 to the video output device 2.

  Here, an example of a communication state monitoring / determination method will be described. The video reproduction device 3 notifies the video output device 2 of the reception rate (reception data size per second) of the reception data periodically or at a desired timing. When the reception rate is equal to or higher than the threshold, it is determined that the communication state is good, and when the reception rate is lower than the threshold, it is determined that the communication state is bad. This threshold value may be determined in advance or may be arbitrarily set by the user.

  The video reproduction device 3 includes a communication unit 31 for connecting to the video output device 2 via the network 4, a control unit 32 including a CPU for controlling the operation of the device, and a video data recording unit. An HDD (hard disk drive) 33, a memory 34 for storing a control program for controlling the operation of the apparatus, and a display unit 35 for displaying and outputting video data are provided. Further, the control unit 32 decodes a video signal from the video output device 2 and an interpolation frame to be inserted between the two original frames based on the two original frames and the interpolation frame information of the video signal. An interpolation frame generation unit 32b to generate and an interpolation frame information generation unit 32c to generate interpolation frame information based on the video signal. The display unit 35 includes a display 35a configured by an LCD or the like, and a screen to be displayed on the display 35a And a video RAM 35b for storing data.

  The interpolation frame information generation unit 32c may generate interpolation frame information from two adjacent frames of the video signal, for example, as with the interpolation frame information generation unit 22a described above. Such a frame is not limited to two adjacent frames, but may be a plurality of frames, and may not necessarily be a plurality of frames as long as the image format can generate an interpolation frame from one frame.

  The decoder 32a is required to decode the original frame that has been re-encoded by the video output device 2, but it is not necessary to decode the original frame that has not been re-encoded. The decoder 32a may be deleted from the configuration.

  FIG. 4 is a flowchart for explaining an example of the frame interpolation process by the video output device and the video playback device that constitute the video display system according to the first embodiment of the present invention. First, in the video output device 2, the communication status monitoring unit 22d monitors the communication status with the video playback device 3 (step S1), and the condition determination unit 22c determines whether the communication status is in accordance with the communication status determination method described above. It is determined whether it is good (step S2).

  If it is determined in step S2 that the communication state is poor (in the case of NO), the video output device 2 desirably reduces the data transmission amount as much as possible. Therefore, the communication unit 25 transmits only the original frame to the video reproduction device 3. Transmit (step S3). In this case, since the interpolation frame information generation unit 22a does not generate interpolation frame information, the interpolation frame information is generated on the video reproduction device 3 side.

  In the video reproduction device 3, when the communication unit 31 receives the original frame from the video output device 2 (step S4), the interpolation frame information generation unit 32c generates interpolation frame information based on the two adjacent original frames (step S4). S5). Then, the interpolation frame generation unit 32b generates an interpolation frame to be inserted between the original frames using two adjacent original frames and the interpolation frame information (step S6). And the display part 35 displays the image | video which consists of an original frame and an interpolation frame (step S7).

  Further, when it is determined in step S2 that the communication state is good (in the case of YES), it is more efficient for the video output device 2 to generate the interpolation frame information on the video output device 2 side. The unit 22a generates interpolation frame information based on two adjacent original frames (step S8), and the communication unit 25 transmits the original frame and the interpolation frame information to the video reproduction device 3 (step S9).

  When the communication unit 31 receives the original frame and the interpolation frame information from the video output device 2 (step S10), the video reproduction device 3 proceeds to step S6, and the interpolation frame generation unit 32b performs the two adjacent original frames. And the interpolation frame information are used to generate an interpolation frame to be inserted between the original frames, and the display unit 35 displays an image composed of the original frame and the interpolation frame.

5 and 6 are diagrams for explaining an example of the frame interpolation method according to the present invention. The frame interpolation method applicable to the present invention is not particularly limited, and a known method such as motion interpolation or linear interpolation can be used. This frame interpolation method is executed by the interpolation frame information generation unit 22a (or the interpolation frame information generation unit 32c) and the interpolation frame generation unit 32b.
In FIG. 5, a frame T is an interpolated frame inserted between the frame 1 and the frame 2. In order to generate this frame T, for example, a method based on difference information shown in FIG. 6 can be used.

  In FIG. 6, the frame information of an arbitrary pixel (x, y) in frame 1 is F1 (x, y), and the frame information of the pixel (x, y) in frame 2 is F2 (x + dx, y + dy). In this frame information F2, dx and dy indicate the amount of change in information. The frame information of the pixel (x, y) in the interpolation frame T is Ft (x + 1 / 2dx, y + 1 / 2dy). Thus, if there is frame information F1 and F2 of frames 1 and 2 and difference information (that is, interpolation frame information) that is the amount of change between frames 1 and 2, frame information Ft is obtained, and interpolation frame T can be generated. it can.

  FIG. 7 is a flowchart for explaining an example of interpolation frame information generation processing by the video output apparatus. First, when the video output device 2 acquires the received video by the video receiver 21 (step S11), the interpolation frame information generator 22a decodes (decodes) the video (step S12). Then, the interpolation frame information generation unit 22a creates interpolation frame information from two adjacent frames (original frames) of the decoded video (step S13), and passes the original frame and interpolation frame information to the communication unit 25 (step S14).

  FIG. 8 is a flowchart for explaining a modified example of the frame interpolation processing by the video output device and the video playback device that constitute the video display system according to the first embodiment of the present invention. In this example, when the communication state between devices is poor, a case will be described in which the frame rate is reduced to reduce the communication load without interfering with the bit rate, and the video reproduction device side performs interpolation and reproduction. That is, according to the present invention, not only the case where the number of frames is increased by adding an interpolation frame to the original frame as shown in FIG. 4 described above, but also the amount thinned out from the original frame as shown in this example. The present invention can also be applied to a case where an interpolation frame is generated.

  First, in the video output device 2, the communication status monitoring unit 22d monitors the communication status with the video playback device 3 (step S21), and the condition determination unit 22c determines whether the communication status is in accordance with the communication status determination method described above. It is determined whether or not it is good (step S22).

In the video output device 2, when it is determined in step S22 that the communication state is good (in the case of YES), the communication unit 25 transmits the original frame to the video reproduction device 3 (step S23).
In the video reproduction device 3, when the communication unit 31 receives the original frame from the video output device 2 (step S24), the display unit 35 displays the video composed of the original frame (step S25).

  When the video output device 2 determines in step S22 that the communication state is bad (in the case of NO), the control unit 22 partially thins the original frame (step S26) in order to reduce the communication load. The communication unit 25 transmits the remaining original frames to the video reproduction device 3 (step S27). In this case, since the interpolation frame information generation unit 22a does not generate interpolation frame information, the interpolation frame information is generated on the video reproduction device 3 side.

  In the video reproduction device 3, when the communication unit 31 receives the remaining original frames from the video output device 2 (step S28), the interpolation frame information generation unit 32c generates interpolation frame information based on the two adjacent original frames. (Step S29). Then, the interpolation frame generation unit 32b generates an interpolation frame to be inserted between the original frames using the two adjacent original frames and the interpolation frame information (step S30). And the display part 35 displays the image | video which consists of an original frame and an interpolation frame (step S31).

  In the case of this example, since the frames thinned out from the original frame are inserted as interpolation frames, the number of frames reproduced by the video reproduction device 3 is the same as the number of frames as the original frame. Note that the video reproduction device 3 may further generate an interpolation frame by using the interpolation frames thinned out from the original frame. In this case, since the number of frames increases from the original frame, it is possible to improve the moving image quality.

  Further, in the above modification, the amount of data of the interpolation frame information is not as large as that of the original frame. Therefore, not only the video output device 2 simply thins out but also generates interpolation frame information from the remaining frames that have not been thinned out. May be. In this case, the video output device 2 transmits the remaining frames and interpolation frame information to the video playback device 3. According to this, since the video output device 2 generates the interpolation frame information, the load for generating the interpolation frame information in the video reproduction device 3 can be reduced.

  As described above, according to the present embodiment, in the video display system including the video output device and the video playback device, the load of the frame interpolation processing can be distributed based on the communication state between the devices. Can be executed automatically.

(Second Embodiment)
FIG. 9 is a diagram for explaining an example of frame interpolation processing by the video output device and the video playback device that constitute the video display system according to the second embodiment of the present invention. In the present embodiment, the video output device 2 acquires information (spec information) related to the processing capability of the video playback device 3.

  As shown in FIG. 9A, when the specifications of the video playback device 3 are high, the video output device 2 generates the interpolation frame information because the video playback device 3 can reduce the communication load by generating the interpolation frame information. Instead, only the original frame 101 which is an adjacent frame is transmitted to the video reproduction device 3. When receiving the original frame 101, the video reproduction device 3 generates interpolation frame information from the original frame 101, and generates an interpolation frame based on the interpolation frame information and the original frame 101.

  On the other hand, as shown in FIG. 9B, when the specification of the video playback device 3 is low, it is possible to reduce the processing load on the video playback device 3 by generating interpolation frame information on the video output device 2 side. The apparatus 2 generates the interpolation frame information 102 and transmits the interpolation frame information 102 and the original frame 101 to the video reproduction apparatus 3. When receiving the original frame 101 and the interpolation frame information 102, the video reproduction device 3 generates an interpolation frame based on the original frame 101 and the interpolation frame information 102.

  FIG. 10 is a block diagram illustrating a configuration example of the video display system illustrated in FIG. Similar to the configuration shown in FIG. 3, the video output device 2 includes a tuner (video receiving unit) 21, a control unit 22, an HDD 23, a memory 24, and a communication unit 25, and the control unit 22 further generates interpolation frame information. A unit 22a, an encoder 22b, and a condition determination unit 22c are provided.

  In the case of this embodiment, the condition determination unit 22c includes a specification information acquisition unit 22e corresponding to the capability information acquisition unit of the present invention that acquires information related to the processing capability of the video playback device 3. The condition determination unit 22c determines which of the video output device 2 and the video playback device 3 generates the interpolation frame information based on the processing capability of the video playback device 3 acquired by the specification information acquisition unit 22e.

  More specifically, the condition determination unit 22c determines that the video playback device 3 generates the interpolation frame information when the specification of the video playback device 3 is equal to or higher than a predetermined level (for example, “high” or higher), and the video playback device 3 Is less than a predetermined level (for example, less than “high”), it is determined that the video output device 2 generates interpolation frame information.

  As in the first embodiment, the condition determination unit 22c may be provided on the video playback device 3 side, or may be provided on both the video output device 2 and the video playback device 3. When the condition determination unit 22c is provided in the video reproduction device 3, the determination result is notified from the video reproduction device 3 to the video output device 2.

  Here, an example of the specification information acquisition method will be described. The specification information acquisition unit 22e acquires the specification information of the video playback device 3 at the start of communication between the video output device 2 and the video playback device 3 or by periodically communicating between the devices. A specific example of the specification information is a CPU clock. In the case of the CPU clock, the video output device 2 is configured such that, for example, the specification is “low” when the clock is 200 MHz or less, the specification is “medium” when the clock is 200 to 500 MHz, and the specification is “high” when the clock is 500 MHz or more. May be stored in the memory 24 in advance. When the specification information acquisition unit 22e acquires the CPU clock information of the video reproduction device 3, the condition determination unit 22c refers to the memory 24 and based on the specification level corresponding to the CPU clock of the video reproduction device 3, the video output device 2 And the video reproduction device 3 determine whether to generate the interpolation frame information.

  Alternatively, the video reproduction device 3 may hold the table in the memory 34. In this case, the video reproduction device 3 refers to the memory 34 and transmits its own specification level to the video output device 2 when there is a request for obtaining spec information from the video output device 2. When the condition determination unit 22c of the video output device 2 acquires the specification level of the video reproduction device 3 by the specification information acquisition unit 22e, the frame information is interpolated by either the video output device 2 or the video reproduction device 3 based on this specification level. Determine whether to generate.

  Similar to the configuration shown in FIG. 3, the video reproduction device 3 includes a communication unit 31, a control unit 32, an HDD 33, a memory 34, and a display unit 35. Further, the control unit 32 includes a decoder 32a, an interpolation frame generation unit 32b, and an interpolation frame information generation unit 32c, and the display unit 35 includes a display 35a and a video RAM 35b.

  Further, as a modification of the second embodiment, when the specification of the video playback device 3 is high, the video output device 2 transmits at a reduced frame rate, and the video playback device 3 performs frame interpolation and playback. Good. As a result, the video output device 2 can transmit with a reduced number of frames, thereby reducing the communication load.

  Further, in the above modification, the amount of data of the interpolation frame information is not as large as that of the original frame. Therefore, not only the image output device 2 simply thins out (decreases the frame rate), but also the remaining frames that are not thinned out after thinning More interpolated frame information may be generated. In this case, the video output device 2 transmits the remaining frames and interpolation frame information to the video playback device 3. According to this, since the video output device 2 generates the interpolation frame information, the load for generating the interpolation frame information in the video reproduction device 3 can be reduced.

  As described above, according to this embodiment, in the video display system including the video output device and the video playback device, the load of the frame interpolation processing can be distributed based on the specifications of the video playback device. Can be executed automatically.

(Third embodiment)
FIG. 11 is a diagram for explaining an example of frame interpolation processing by the video output device and the video playback device that constitute the video display system according to the third embodiment of the present invention. In the present embodiment, the video playback device 3 includes a battery, and the video output device 2 monitors the remaining battery level of the video playback device 3.

  As shown in FIG. 11A, when the battery capacity of the video playback device 3 is large, the communication load can be reduced if the video playback device 3 generates the interpolation frame information. Are generated, and only the original frame 101 which is an adjacent frame is transmitted to the video reproduction apparatus 3. When receiving the original frame 101, the video reproduction device 3 generates interpolation frame information from the original frame 101, and generates an interpolation frame based on the interpolation frame information and the original frame 101.

  On the other hand, as shown in FIG. 11B, when the battery of the video playback device 3 is low, it is possible to extend the battery life by generating interpolation frame information on the video output device 2 side. 2 generates the interpolation frame information 102, and transmits the interpolation frame information 102 and the original frame 101 to the video reproduction apparatus 3. When receiving the original frame 101 and the interpolation frame information 102, the video reproduction device 3 generates an interpolation frame based on the original frame 101 and the interpolation frame information 102.

  FIG. 12 is a block diagram illustrating a configuration example of the video display system illustrated in FIG. 11. Similar to the configuration shown in FIG. 3, the video output device 2 includes a tuner (video receiving unit) 21, a control unit 22, an HDD 23, a memory 24, and a communication unit 25, and the control unit 22 further generates interpolation frame information. A unit 22a, an encoder 22b, and a condition determination unit 22c are provided.

  In the case of the present embodiment, the condition determination unit 22c includes a battery remaining amount monitoring unit 22f that monitors the battery remaining amount of the video playback device 3. The condition determination unit 22c determines which of the video output device 2 and the video playback device 3 generates the interpolation frame information based on the remaining battery level of the video playback device 3 monitored by the battery remaining amount monitoring unit 22f.

  More specifically, the condition determination unit 22c determines that the interpolated frame information is to be generated by the video playback device 3 when the remaining battery level of the video playback device 3 is equal to or higher than a predetermined level (for example, “medium” or higher). When the remaining battery level of the device 3 is less than a predetermined level (for example, less than “medium”), it is determined that the video output device 2 generates interpolation frame information.

  As in the first and second embodiments, the condition determination unit 22c may be provided on the video playback device 3 side, or may be provided on both the video output device 2 and the video playback device 3. Good. When the condition determination unit 22c is provided in the video reproduction device 3, the determination result is notified from the video reproduction device 3 to the video output device 2.

  Here, an example of a method for monitoring and determining the remaining battery capacity will be described. The battery remaining amount monitoring unit 22f acquires the battery remaining amount of the video reproduction device 3 at the start of communication between the video output device 2 and the video reproduction device 3 or by periodically communicating between the devices. In the case of the remaining battery level, the video output device 2, for example, the remaining amount “low” when the battery voltage is 1 V or lower, the remaining amount “medium” when the battery voltage is 1 to 2.5 V, and the remaining amount “high” when the battery voltage is 2.5 V or higher. As shown in the table, a table in which the battery voltage and the remaining level are associated with each other may be stored in the memory 24 in advance. When the battery level of the video playback device 3 is acquired by the battery remaining amount monitoring unit 22f, the condition determination unit 22c refers to the memory 24, and based on the remaining level corresponding to the battery voltage of the video playback device 3, the video output device 2 or the video reproduction device 3 determines whether to generate the interpolation frame information.

  Alternatively, the video reproduction device 3 may hold the table in the memory 34. In this case, when there is a request for acquiring the remaining battery level from the video output device 2, the video playback device 3 refers to the memory 34 and transmits its own remaining level to the video output device 2. When the condition determination unit 22c of the video output device 2 acquires the remaining level of the video playback device 3 by the battery remaining amount monitoring unit 22f, either the video output device 2 or the video playback device 3 uses the remaining level. It is determined whether to generate interpolation frame information.

  Similar to the configuration shown in FIG. 3, the video reproduction device 3 includes a communication unit 31, a control unit 32, an HDD 33, a memory 34, and a display unit 35, and further includes a battery 36. The control unit 32 includes a decoder 32a, an interpolation frame generation unit 32b, and an interpolation frame information generation unit 32c. The display unit 35 includes a display 35a and a video RAM 35b.

  Further, as a modification of the third embodiment, when the battery of the video playback device 3 is large, the video output device 2 transmits at a reduced frame rate, and the video playback device 3 performs frame interpolation for playback. May be. As a result, the video output device 2 can transmit with a reduced number of frames, thereby reducing the communication load.

  Further, in the above modification, the amount of data of the interpolation frame information is not as large as that of the original frame. Therefore, not only the image output device 2 simply thins out (decreases the frame rate) but also the remaining frames that are not thinned out after being thinned out. More interpolated frame information may be generated. In this case, the video output device 2 transmits the remaining frames and interpolation frame information to the video playback device 3. According to this, since the video output device 2 generates the interpolation frame information, the load for generating the interpolation frame information in the video reproduction device 3 can be reduced.

  Further, when the battery capacity of the video playback device 3 is small, the processing capability (CPU clock or the like) of the video playback device 3 may be reduced to control power consumption. Some CPUs can control the processing capability. For example, some CPUs have a mode operating at 200 MHz and a mode operating at 500 MHz. Usually, the power consumption increases as the processing capacity increases.

  Accordingly, when the remaining battery level is low, in order to make the battery last as long as possible, the video reproduction device 3 is operated at 200 MHz having a small processing capacity, and the interpolation frame information is generated on the video output device 2 side. On the other hand, when the remaining battery level is high, the video playback device 3 may be operated at a high processing capacity of 500 MHz in order to reduce the communication load, and the interpolated frame information may be generated on the video playback device 3 side.

  As described above, according to this embodiment, in the video display system including the video output device and the video playback device, the frame interpolation processing load can be distributed based on the remaining battery level of the video playback device. Can be executed efficiently.

  In the first to third embodiments described above, the condition determination unit 22c determines which of the video output device 2 and the video playback device 3 generates the interpolation frame information. Interpolation frame information may be generated by both of the playback devices 3. In this case, the interpolation frame information generation unit 22a of the video output device 2 generates interpolation frame information from a part of the frame of the video signal, and the interpolation frame information generation unit 32c of the video reproduction device 3 interpolates from the remaining frame of the video signal. Generate frame information.

  For example, when 15 frames of video signals are interpolated into 30 frames, interpolated frame information between 1-2, 2-3,..., 7-8 frames is generated by the video output device 2, and the remaining 8-9, Interpolated frame information between 9-10,..., 14-15 is generated by the video reproduction device 3. By performing this interpolated frame information generation process simultaneously with two devices, it is possible to efficiently distribute the load. Note that the ratio of the load between the two devices (that is, how many frames are allocated to each of the video output device 2 and the video playback device 3) may be set in advance according to the number of original frames, and can be arbitrarily set by the user. It may be possible to set to.

  Further, the ratio of the load between the two devices is determined based on the conditions determined by the condition determining unit 22c, that is, the communication state between the devices, the processing capability of the video reproduction device 3, the remaining battery level, and the like. Also good. For example, if the communication state is good, in order to reduce the processing load on the video reproduction device 3, the load ratio of the video output device 2 is increased to generate the interpolation frame information, while if the communication state is bad, In order to reduce the communication load, interpolation frame information is generated by increasing the load ratio of the video reproduction device 3.

(Fourth embodiment)
FIG. 13 is a diagram for explaining an example of frame interpolation processing by the video output device and the video playback device that configure the video display system according to the fourth embodiment of the present invention. In this embodiment, the number of interpolation frames generated can be arbitrarily changed in any of the first to third embodiments described above.

As shown in FIG. 13A, when the low image quality (normal) mode is set from the video playback device 3, since the interpolation frame is not added, the video output device 2 plays back only the original frames 101 ₁ and 101 _2. The video reproduction device 3 displays and outputs the video 100 composed of these original frames 101 ₁ and 101 ₂ .

Further, as shown in FIG. 13B, when the medium image quality mode is set from the video playback device 3, the video output device 2 interpolates with the original frames 101 ₁ and 101 ₂ in order to add one interpolation frame, for example. The frame information 102 is transmitted to the video reproduction device 3, and the video reproduction device 3 generates the interpolation frame 103 based on the original frames 101 ₁ and 101 ₂ and the interpolation frame information 102, and the original frames 101 ₁ and 101 ₂ The video 100 composed of the interpolation frame 103 is displayed and output.

Further, as shown in FIG. 13C, when the high image quality mode is set from the video reproduction device 3, the video output device 2 interpolates with the original frames 101 ₁ and 101 ₂ in order to add, for example, three interpolation frames. The frame information 102 ₁ , 102 ₂ , 102 ₃ is transmitted to the video reproduction device 3, and the video reproduction device 3 performs interpolation based on the original frames 101 ₁ , 101 ₂ and the interpolation frame information 102 ₁ , 102 ₂ , 102 _3. Frames 103 ₁ , 103 ₂ , and 103 ₃ are generated, and an image 100 including the original frames 101 ₁ and 101 ₂ and the interpolation frames 103 ₁ , 103 ₂ , and 103 ₃ is displayed and output. In this case, the video output device 2 first generates an interpolated frame information 102 ₁ from the original frame ₁₀₁ 1, 101 _2, and generates an interpolation frame 103 from the interpolation frame information 102 _1, further original frame ₁₀₁ 1, 101 ₂ and the interpolated frame 103, interpolated frame information 102 ₂ and 102 ₃ are generated.

  FIG. 14 is a block diagram illustrating a configuration example of the video display system illustrated in FIG. 13. Similar to the configuration shown in FIG. 3, the video output device 2 includes a tuner (video receiving unit) 21, a control unit 22, an HDD 23, a memory 24, and a communication unit 25, and the control unit 22 further generates interpolation frame information. A unit 22a, an encoder 22b, and a condition determination unit 22c are provided.

  Similarly to the configuration shown in FIG. 3, the video reproduction device 3 includes a communication unit 31, a control unit 32, an HDD 33, a memory 34, and a display unit 35, and further includes an input unit 37. The control unit 32 includes a decoder 32a, an interpolation frame generation unit 32b, and an interpolation frame information generation unit 32c. The display unit 35 includes a display 35a and a video RAM 35b.

  In the case of the present embodiment, the video playback device 3 includes an input unit 37 that inputs and designates the number of interpolation frame generations to the video output device 2. The input unit 37 displays an image quality mode designation screen shown in FIG. 15 according to a user operation. The image quality mode designation screen of this example is composed of three stages of “high image quality”, “medium image quality”, and “normal”. When the user selects a desired image quality mode and presses the send button, the selected image quality mode is displayed. Is transmitted to the video output device 2.

  As illustrated in FIG. 13, the interpolation frame information generation unit 22 a of the video output device 2 generates interpolation frame information corresponding to the number of interpolation frames corresponding to the image quality mode from the video reproduction device 3. An example of a table indicating the correspondence between the image quality mode and the number of interpolation frames is shown in FIG. Note that the table shown in FIG. 17 may be stored in the memory 24 in advance.

  FIG. 16 is a flowchart for explaining an example of the frame interpolation processing by the video output device and the video playback device that constitute the video display system according to the fourth embodiment of the present invention. First, the video output device 2 determines the image quality mode based on the image quality mode information received from the input unit 37 of the video reproduction device 3 (step S41), and based on the table shown in FIG. Is determined (step S42). In the video output device 2, the interpolation frame information generation unit 22 a generates interpolation frame information based on the number of interpolation frames (step S 43), and the communication unit 25 transmits the original frame and the interpolation frame information to the video reproduction device 3. (Step S44).

  In the video reproduction device 3, the communication unit 31 receives the original frame and the interpolation frame information (step S45), and the interpolation frame generation unit 32b generates an interpolation frame using the original frame and the interpolation frame information (step S46). And the display part 35 displays the image | video which consists of an original frame and an interpolation frame (step S47).

  As a modification of the fourth embodiment, in the case of a system in which the communication line connecting the video output device 2 and the video reproduction device 3 can be switched to a high speed line or a low speed line, an interpolation frame designated by the video reproduction device 3 is used. Depending on the number, the communication line may be switched. For example, when the number of interpolation frames is large, control is performed to switch to a high speed line, and when the number of interpolation frames is small, control is performed to switch to a low speed line.

  According to the present embodiment, in the video display system including the video output device and the video playback device, the load of the frame interpolation process is reduced based on the communication state between the devices, the processing capability of the video playback device, the remaining battery level, and the like. Since it can be distributed, frame interpolation processing can be executed efficiently, and the number of interpolation frames can be arbitrarily specified by the user, so that optimal frame interpolation processing according to the program content can be performed. It becomes. For example, the number of interpolation frames can be specified such that if the program that the user views is a program that the user wants to watch with high image quality, the number of interpolation frames is increased, and if the normal image quality is acceptable, no interpolation is performed.

  Further, the input unit 37 included in the video reproduction device 3 may display an input screen for the user to arbitrarily input and specify the condition determined by the condition determining unit 22c. The condition determination unit 22 c determines which of the video output device 2 and the video reproduction device 3 generates the interpolation frame information based on the determination condition specified from the input unit 37. Conditions that can be specified by the user are, for example, the communication state between the devices, the processing capability of the video reproduction device 3, and the remaining battery level.

  Then, it may be possible to specify how to distribute the load based on the criterion of each condition. As a specific example, as described above, if the communication state is good, interpolation frame information is generated on the video output device 2 side, and if the communication state is bad, interpolation frame information is generated on the video reproduction device 3 side. Depending on the conditions specified by the user, how to distribute the load may be arbitrarily specified.

(Fifth embodiment)
FIG. 18 is a diagram for explaining an example of frame interpolation processing by the video output device and the video playback device that configure the video display system according to the fifth embodiment of the present invention. In the present embodiment, the video output device 2 always generates the interpolation frame information regardless of the communication state between the devices, the processing capability of the video playback device 3, the remaining battery level, and the like.

The video output device 2 generates the interpolation frame information 102 based on the two adjacent original frames 101 ₁ and 101 ₂ , and transmits the interpolation frame information 102 and the original frames 101 ₁ and 101 ₂ to the video reproduction device 3. . Picture reproducing apparatus 3 receives the original frame ₁₀₁ 1, 101 ₂ and the interpolation frame information 102, the original frame ₁₀₁ 1, 101 ₂ and based on the interpolation frame information 102 to generate the interpolation frame 103, the original frame ₁₀₁ 1, 101 ₂ and an interpolation frame 103 are displayed and output.

  FIG. 19 is a block diagram illustrating a configuration example of the video display system illustrated in FIG. The video output device 2 includes a tuner (video receiving unit) 21, a control unit 22, an HDD 23, a memory 24, and a communication unit 25. The control unit 22 further includes an interpolation frame information generation unit 22a and an encoder 22b. In the case of this example, since the interpolation frame information is always generated by the interpolation frame information generation unit 22a, the condition determination unit 22c may not be included in the configuration.

  On the other hand, the video reproduction device 3 includes a communication unit 31, a control unit 32, an HDD 33, a memory 34, and a display unit 35. The control unit 32 includes a decoder 32a and an interpolation frame generation unit 32b, and the display unit 35 includes a display 35a and a video RAM 35b. In the case of this example, since the interpolation frame information generation unit 22a of the video output device 2 always generates the interpolation frame information, the configuration may not include the interpolation frame information generation unit 32c.

  FIG. 20 is a flowchart for explaining an example of the frame interpolation processing by the video output device and the video playback device that constitute the video display system according to the fifth embodiment of the present invention. First, in the video output device 2, when the video receiving unit 21 receives video (step S51), the interpolation frame information generation unit 22a generates interpolation frame information (step S52), and the communication unit 25 uses the original frame and interpolation frame information. Is transmitted to the video reproduction device (step S53).

  In the video reproduction device 3, the communication unit 31 receives the original frame and the interpolation frame information (step S54), and the interpolation frame generation unit 32b generates an interpolation frame using the original frame and the interpolation frame information (step S55). And the display part 35 displays the image | video which consists of an original frame and an interpolation frame (step S56).

  According to the present embodiment, in a video display system including a video output device and a video playback device, the interpolation frame information is always generated and transmitted on the video output device side, so the load of frame interpolation processing on the video playback device side is reduced. Can be reduced.

  In addition, although demonstrated as a structure provided with the interpolation frame production | generation part in the video reproduction apparatus side until now, you may make it provide an interpolation frame production | generation part in the video output apparatus side, and may transmit an interpolation frame to a video reproduction apparatus.

It is a figure which shows the structural example of the video display system which concerns on one Embodiment of this invention. It is a figure for demonstrating an example of the frame interpolation process by the video output apparatus and video reproduction apparatus which comprise the video display system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the video display system shown in FIG. It is a flowchart for demonstrating an example of the frame interpolation process by the video output apparatus and video reproduction | regeneration apparatus which comprise the video display system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating an example of the frame interpolation method which concerns on this invention. It is a figure for demonstrating an example of the frame interpolation method which concerns on this invention. It is a flowchart for demonstrating an example of the interpolation frame information generation process by a video output device. It is a flowchart for demonstrating the modification of the frame interpolation process by the video output device which comprises the video display system which concerns on the 1st Embodiment of this invention, and a video reproduction apparatus. It is a figure for demonstrating an example of the frame interpolation process by the video output apparatus and video reproduction apparatus which comprise the video display system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structural example of the video display system shown in FIG. It is a figure for demonstrating an example of the frame interpolation process by the video output apparatus and video reproduction apparatus which comprise the video display system which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows the structural example of the video display system shown in FIG. It is a figure for demonstrating an example of the frame interpolation process by the video output apparatus and video reproduction apparatus which comprise the video display system which concerns on the 4th Embodiment of this invention. It is a block diagram which shows the structural example of the video display system shown in FIG. It is a figure which shows an example of the image quality mode designation | designated screen of a video reproduction apparatus. It is a flowchart for demonstrating an example of the frame interpolation process by the video output apparatus and video reproduction apparatus which comprise the video display system which concerns on the 4th Embodiment of this invention. It is a figure which shows an example of the table which shows the correspondence of image quality mode and the number of interpolation frames. It is a figure for demonstrating an example of the frame interpolation process by the video output device and video reproduction | regeneration apparatus which comprise the video display system which concerns on the 5th Embodiment of this invention. It is a block diagram which shows the structural example of the video display system shown in FIG. It is a flowchart for demonstrating an example of the frame interpolation process by the video output device and video reproduction | regeneration apparatus which comprise the video display system which concerns on the 5th Embodiment of this invention. It is a figure for demonstrating the frame interpolation process by the video output apparatus and video reproduction apparatus which comprise the conventional video display system. It is a block diagram which shows the structure of the conventional video display system shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Television apparatus, 2,200 ... Video output device, 3,300 ... Video reproduction apparatus, 4 ... Network, 21,201 ... Tuner (video receiving part), 22, 32 ... Control part, 22a, 32c, 302 ... Interpolation Frame information generation unit, 22b ... encoder, 22c ... condition determination unit, 22d ... communication state monitoring unit, 22e ... spec information acquisition unit, 22f ... battery remaining amount monitoring unit, 23, 33 ... HDD, 24, 34 ... memory, 25 , 31, 202, 301 ... communication unit, 32a ... decoder, 32b, 304 ... interpolation frame generation unit, 35, 303 ... display unit, 35a ... display, 35b ... video RAM, 36 ... battery, 37 ... input unit.

Claims (17)

A video display system in which a video output device that outputs a video signal and a video playback device that plays back a video signal from the video output device are connected via a network,
The video output device and the video playback device include an interpolation frame information generation unit that generates interpolation frame information based on a video signal,
The video output device and / or the video playback device determines whether to generate interpolated frame information in the video output device or the video playback device based on a predetermined condition relating to the video playback device. A video display system comprising: The video display system according to claim 1, wherein the condition determination unit includes a communication state monitoring unit that monitors a communication state between the video output device and the video reproduction device,
It is determined whether the interpolated frame information is generated by the video output device or the video playback device based on the communication status between the video output device and the video playback device monitored by the communication status monitoring unit. Video display system.   The video display system according to claim 2, wherein the condition determination unit determines that the video output device side generates interpolation frame information when the communication state is good, and when the communication state is bad, the video A video display system characterized by determining that interpolation frame information is generated on a playback device side.   4. The video display system according to claim 3, wherein the video output device reduces the number of frames of the video signal when the communication state is poor. The video display system according to claim 1, wherein the condition determination unit includes a capability information acquisition unit that acquires information related to processing capability of the video playback device,
A video display system that determines which of the video output device and the video playback device generates interpolation frame information based on the processing capability of the video playback device acquired by the capability information acquisition unit.   6. The video display system according to claim 5, wherein when the processing capability of the video playback device is equal to or higher than a predetermined level, the condition determination unit determines to generate interpolation frame information on the video playback device side, and When the processing capability is less than a predetermined level, the video output system determines that the interpolated frame information is generated on the video output device side.   7. The video display system according to claim 6, wherein the video output device reduces the number of frames of the video signal when the processing capability of the video playback device is equal to or higher than a predetermined level. The video display system according to claim 1, wherein the condition determination unit includes a battery remaining amount monitoring unit that monitors a remaining battery level of the video reproduction device when the video reproduction device includes a battery.
A video display comprising: determining whether interpolation video frame information is to be generated by the video output device or the video playback device based on a battery remaining amount of the video playback device monitored by the battery remaining amount monitoring unit. system.   9. The video display system according to claim 8, wherein the condition determination unit determines that interpolation video frame information is generated on the video playback device side when the remaining battery level of the video playback device is equal to or higher than a predetermined level, and the video playback is performed. A video display system, wherein when the remaining battery level of the apparatus is less than a predetermined level, the video output apparatus side determines to generate interpolation frame information.   10. The video display system according to claim 9, wherein the video output device reduces the number of frames of the video signal when a remaining battery level of the video playback device is equal to or higher than a predetermined level.   11. The video display system according to claim 4, wherein the video output device uses interpolation frame information for generating a reduced frame from the video signal as remaining frames of the video signal. A video display system generated from 12. The video display system according to claim 1, wherein the video playback device includes an input unit that inputs and designates the number of generated interpolation frames to the video output device,
The video display system, wherein the interpolation frame information generation unit of the video output device generates interpolation frame information corresponding to the number of interpolation frames specified from the input unit.   12. The video display system according to claim 1, wherein the interpolation frame information generation unit generates interpolation frame information based on two adjacent frames of the video signal. Display system.   14. The video display system according to claim 13, wherein the video playback device is configured to use the two adjacent frames based on the two adjacent frames and interpolation frame information generated by the video output device or the video playback device. An image display system comprising an interpolation frame generation unit that generates an interpolation frame to be inserted between two frames. 12. The video display system according to claim 1, wherein the video playback device includes an input unit through which a user inputs and designates a condition determined by the condition determining unit,
The video display system according to claim 1, wherein the condition determination unit determines which of the video output device and the video reproduction device generates the interpolation frame information based on a determination condition designated by the input unit.   The video display system according to claim 1, wherein when the interpolated frame information is generated by both the video output device and the video playback device, the interpolated frame information generation unit of the video output device includes a part of the video signal. A video display system, wherein interpolation frame information is generated from a frame, and the interpolation frame information generation unit of the video reproduction device generates interpolation frame information from the remaining frames of the video signal. A video output device connected via a network to a video playback device capable of generating interpolation frame information based on a video signal,
An interpolation frame information generation unit that generates interpolation frame information based on a video signal, and which of the video output device and the video playback device generates interpolation frame information based on a predetermined condition relating to the video playback device A video output device comprising: a condition determining unit for determining.

Images