WO2009093557A1 - マルチ画面表示装置 - Google Patents
マルチ画面表示装置 Download PDFInfo
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- WO2009093557A1 WO2009093557A1 PCT/JP2009/050719 JP2009050719W WO2009093557A1 WO 2009093557 A1 WO2009093557 A1 WO 2009093557A1 JP 2009050719 W JP2009050719 W JP 2009050719W WO 2009093557 A1 WO2009093557 A1 WO 2009093557A1
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- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 13
- 230000007704 transition Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000013500 data storage Methods 0.000 description 9
- 238000013075 data extraction Methods 0.000 description 6
- 230000008707 rearrangement Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
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- 230000002457 bidirectional effect Effects 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
- H04N21/4312—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations
- H04N21/4316—Generation of visual interfaces for content selection or interaction; Content or additional data rendering involving specific graphical features, e.g. screen layout, special fonts or colors, blinking icons, highlights or animations for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
- H04N21/4438—Window management, e.g. event handling following interaction with the user interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
Definitions
- the present invention relates to a multi-screen display device that simultaneously displays a plurality of video contents, and relates to a multi-screen display device that reduces the load of decoding processing of encoded video content.
- a television program selects a channel from character information using an EPG (electronic program guide), or in a recorded program recorded in a recording device, a still image of each program and program information from the EPG are displayed on the same screen. Images are selected by selecting from a plurality of thumbnail displays arranged on the Internet or by narrowing down moving images by character search using keywords.
- EPG electronic program guide
- a multi-screen display system that simultaneously displays videos taken from a plurality of video signals on each area of a screen divided into a plurality of areas has come to be used. ing. With the widespread use of large screens and high-definition display devices in the future, it will be possible to select a video from several tens to several hundreds of images at the same time, and select the video that you want to view from many videos. I think that the.
- a multi-screen display system is useful as a means for selecting a desired video from a large number of videos in a large-screen display device.
- the program selection support device of Patent Document 1 Of the programs displayed on the multi-screen, the display size of the program is changed according to the length of time the user is watching, thereby preventing the efficiency of program selection from being reduced.
- FIG. 10 is a block diagram showing a configuration example of this moving image reproduction method.
- input encoded data is sequentially stored in the buffer 11, the input data is sequentially read, and necessary information is separated by the demultiplexer 12.
- motion compensation is performed by the motion prediction unit 18 using the frame before or after being accumulated in the variable length decoding unit 13, inverse quantizer 14, inverse DCT (Inverse Discrete CosineformTransform) unit 15, and picture accumulation unit 19.
- Each process is performed and stored in the frame buffer.
- the picture rearrangement unit 17 arranges the order of the pictures from the frame buffer, reads them in the order to be displayed, and outputs them on the screen.
- the moving picture data encoded by the MPEG method is divided into three types of picture (picture) types based on the inter-frame prediction method, that is, an I picture that is an image that is independently encoded within a picture, and one-sided inter-frame predictive encoding.
- picture picture
- a P picture that is an image to be processed
- B picture that is an image to be subjected to bidirectional interframe prediction encoding.
- Patent Document 2 it is possible to simplify the decoding process by thinning out a code sequence (B-picture code sequence) of an image that does not become a reference image for inter-frame prediction, but all multi-display Since the video is displayed with dropped frames, it may be difficult to grasp the content of the video, and it may not be possible to determine whether the video is a desired video.
- code sequence B-picture code sequence
- the present invention has been made in consideration of the above situation, and a multi-screen that displays more video using a multi-screen display without a sense of incongruity while reducing the load of decoding the encoded video content.
- An object is to provide a display device.
- the multi-screen display device of the present invention is a multi-screen display device that displays a plurality of videos on a single screen, the highlight screen determination unit for designating a screen for displaying a video to be emphasized among the plurality of videos, A load reducing unit that reduces a processing load in the decoding processing unit for a video other than the video displayed on the screen determined by the emphasis screen determining unit.
- the load reduction unit may reduce a processing load on the video processing unit in the decoding processing unit.
- the load reducing unit is a three-dimensional image in which the video is information-compressed by adding motion compensation by an I picture which is two-dimensional compressed video data in which information is compressed in a frame and an I picture forward in time.
- Coded data including a mixture of a P picture, which is compressed video data, and a B picture, which is three-dimensional compressed video data that is information-compressed by adding motion compensation using a temporally forward or backward I picture or P picture.
- the processing load in the decoding process is reduced by deleting the B picture for the video other than the video displayed on the screen determined by the emphasized screen determination unit.
- the highlight screen determination unit can guide the user's line of sight toward a smooth video by determining a screen to be highlighted every predetermined time.
- the screen layout for multi-display in advance or by the user. For example, when the screen of the display device is divided into 10 vertical videos ⁇ 10 horizontal videos, 100 videos are displayed in a multi-display.
- a screen on which individual images of multi display are displayed is referred to as a small screen.
- a list display of video contents stored in the data storage device is displayed, and the user is allowed to select video contents desired to be multi-displayed from the list display.
- the selected video content is read from the data storage device, resized to the size of each small screen, synthesized on one screen of the display device, and multi-displayed.
- the multi-display is executed in multiple times, otherwise nothing is displayed on the small screens that have no video content to be displayed.
- the screen layout may be changed.
- the user moves the cursor onto the small screen on which the desired video content is displayed with the cross key of the remote controller provided in the multi-screen display device. Select with the OK key.
- the desired video content is selected, the video content is enlarged and displayed on one screen of the display device.
- the user's line of sight is guided so that a desired video content can be easily selected from the multi-display.
- the line of sight moves from left to right and from top to bottom.
- the video displayed on the small screen is emphasized relative to the video displayed on the other small screens, and the small screen displaying the emphasized video is changed to other small screens at regular time intervals.
- the user's line of sight is guided by moving and attracting the user's attention.
- FIG. 1 shows a case where the direction of movement of the line of sight moves sideways in the same direction, which is called scanning lateral movement.
- FIG. 2 shows a case where the movement direction of the line of sight moves so as to draw a letter F, which is called F-shaped movement.
- FIG. 3 shows a case where the line-of-sight movement direction repeats alternately in the left-right direction, and is called a zigzag type lateral movement.
- the numbers shown in FIGS. 1, 2, and 3 represent the order numbers in which the emphasized video is displayed.
- the small screen of order number 1 is emphasized, the small screens corresponding to the surrounding order numbers 2, 9, and 10 are exaggerated from the order number 1, and the small screens for other order numbers are It is displayed with further emphasis.
- the small screen with the sequence number 28 is a target of gaze, this small screen is highlighted and corresponds to the sequence numbers 19, 20, 21, 27, 29, 35, 36, and 37 around it.
- the small screen is displayed with lower emphasis than the sequence number 28, and the small screens for other sequence numbers are displayed with further emphasis.
- the emphasis of the small screen with the sequential number to be watched and the peripheral small screen is made to stand out from the other small screens.
- transition timing For moving from one small screen to the next small screen is set to 1 second according to the order shown in FIGS.
- the moving direction of the line of sight is not limited to the above, but may be an order in which the order shown in each figure is upside down or left and right reversed. Further, not only the movement in the horizontal direction but also the scanning type vertical movement and the zigzag type vertical movement that move in the vertical direction may be used.
- FIG. 4 is a schematic configuration diagram of the multi-screen display device according to the present embodiment.
- the multi-screen display device includes a video selection unit 1, a display position determination unit 2, a display data extraction unit 3, a data storage unit 4, a decoding processing unit 5, a multi-screen generation unit 6, a display unit 7, and an emphasized screen determination.
- the unit 8 is configured to be included.
- the data storage unit 4 stores video content encoded by the MPEG method to be displayed in a multi-display mode, and is composed of a large-capacity storage medium such as a hard disk and a high reading speed. What is stored in the data storage unit 4 is a video signal obtained by converting a signal obtained from a broadcast wave by a tuner unit, a video signal obtained from a video content held by a server connected to a network, and other external video.
- a video signal input from an output device (for example, a DVD device) is a target.
- the video selection unit 1 displays a list display of video content stored in the data storage unit 4, causes the user to select video content desired to be multi-displayed from the list display, and selects the selected video content
- the stored address is supplied to the display position determination unit 2.
- the display position determination unit 2 determines on which of the small screens each video content supplied from the video selection unit 1 is displayed. This assigns a unique number (referred to as a screen number) to the display position of each small screen in multi-display according to a preset division number, and this screen number and the address where the video content is stored Are supplied to the display data extraction unit 3.
- the display data extraction unit 3 supplies the code data of each video content supplied from the display position determination unit 2 to the decoding processing unit 5 at the same time.
- the encoded data is extracted from the address where the video content is stored with reference to the data storage unit 4. Further, when sending the encoded data, the screen number of the small screen on which the video obtained by decoding the encoded data is displayed is added and sent to the decoding processing unit 5.
- the highlight screen determination unit 8 generates a screen number of a small screen to be emphasized, and continues to supply the screen number to the decoding processing unit 5 and the multi-screen generation unit 6 during the transition timing.
- the following information is set in advance as a default value or by the user.
- Transition timing setting The transition timing indicates a time interval for changing the emphasized small screen, and 1 second is set as a default value.
- the transition order number table is a table for storing the screen numbers of the small screens to be highlighted in the order of the highlighting order, and is set when the number of screen divisions and the line-of-sight movement direction are determined.
- the order number to be highlighted is determined from the above-described three types of line-of-sight movement directions or those set by the user. For example, in the case of the scanning type horizontal movement of FIG. 1, the small screen number and the order number to be highlighted are the same, but in the case of FIGS. 2 and 3, the small screen number and the order number to be highlighted are Will not match.
- the highlighting screen determination unit 8 counts up the order of highlighting at each transition timing, acquires the screen number of the small screen at the position corresponding to this count in the transition order number table, and highlights the screen number during the transition timing. It continues to be supplied as information to the decoding processor 5 and the multi-screen generator 6. Here, when the order of highlighting reaches the end of the transition order number table, it is returned to the top of the transition order number table and counted up.
- the decoding processing unit 5 includes a plurality of decoders corresponding to the respective encoded data in order to simultaneously decode a plurality of supplied encoded data (video signal data).
- Each decoder that decodes a single piece of encoded data outputs a video output obtained by decoding the encoded data supplied from the display data extraction unit 3 and a screen number of a small screen on which the video is displayed. This is supplied to the multi-screen generator 6.
- the decoder which decodes single coding data is demonstrated.
- FIG. 5 is a block diagram showing a configuration of the decoder according to the present embodiment.
- the decoder includes a buffer 11, a demultiplexer 12, a load reduction unit 20, a variable length decoding unit 13, an inverse quantizer 14, an inverse DCT unit 15, an adder 16, a picture rearrangement unit 17, a motion.
- the prediction unit 18 and the picture storage unit 19 are included.
- the decoder sequentially stores the encoded data supplied from the display data extraction unit 3 in the buffer 11, sequentially reads the encoded data from the buffer 11 and supplies it to the demultiplexer 12 as the decoding process proceeds.
- the demultiplexer 12 analyzes the header of the encoded data and loads the picture type, the number of pixels in the horizontal direction, the number of lines in the vertical direction, and the encoded data in the case of I, P, B type codes. Supply to the mitigation unit 20. In the case of a motion vector, the motion vector and the encoding mode are supplied to the motion prediction unit 18.
- the load reducing unit 20 sequentially receives the codes from the demultiplexer 12 and discards the B picture codes that meet a predetermined condition, and the I picture and P picture codes remain as they are without changing the length. To the unit 13.
- the variable length decoding unit 13 detects the variable length code from the code supplied from the load reducing unit 20, returns the code to a fixed length code, and supplies the code to the inverse quantizer 14.
- the inverse quantizer 14 inversely transforms the sign of the transform coefficient quantized on the encoding side to the original transform coefficient, and inversely quantizes with the quantization step size from the demultiplexer 12,
- the reverse DCT unit 15 is supplied.
- the inverse DCT unit 15 inversely transforms the transform coefficient from the inverse quantizer 14 to the original pixel value, and the video signal for each macroblock which is DCT (discrete cosine transform) transformed on the encoding side. Play.
- the reproduced video signal is supplied to the picture rearrangement unit 17 via the adder 16 or temporarily stored in the picture storage unit 19.
- the motion prediction unit 18 generates a video signal of the current frame obtained by performing motion compensation on the video signal of the previous frame from the picture storage unit 19 using a motion vector.
- the motion-corrected video signal is added to the video signal from the inverse DCT unit 15 by the adder 16 and stored in the frame buffer.
- the picture rearrangement unit 17 arranges the order of the pictures from the frame buffer, and outputs the video signals read in the order to be displayed.
- FIG. 6 is a block diagram showing a configuration of the load reducing unit 20 in the decoder according to the present embodiment.
- the load reduction unit 20 includes a display size determination unit 21, an emphasized video determination unit 22, and a B picture skip unit 23.
- the range in which the B picture is not deleted even for the small screens around the small screen corresponding to the sequence number to be highlighted, but the range for that is set by a default value or by the user in advance. Shall be kept. For example, when the B picture is not deleted only for the small screen to be watched, the range is set to zero. In addition, the range is set to 3 when the B picture is not deleted even for the small screens that are separated from each other by three on the small screen to be watched. Of course, the range may be 1/2/3 direction instead of four directions.
- the load reduction unit 20 first supplies the encoded data supplied from the demultiplexer 12 to the display size determination unit 21.
- the display size determination unit 21 receives the display size (the number of pixels in the horizontal direction and the number of lines in the vertical direction) of the supplied encoded data from the multiplexer / demultiplexer 12, and whether the display size is equal to or smaller than a predetermined threshold value. Determine. If it is equal to or less than the predetermined threshold, the supplied encoded data is supplied to the B picture skip unit 23. If the value is equal to or greater than the predetermined threshold value, the supplied encoded data is supplied to the enhanced video determination unit 22.
- the predetermined threshold is set as 1/8 of the screen width of the display device.
- the number of vertical lines of encoded data is 135 or less, or the number of horizontal pixels is 240 or less. Uses this as a predetermined threshold value and determines whether or not to skip the B picture.
- the enhanced video determination unit 22 has a screen number that is displayed when the supplied encoded data is decoded is the same as the screen number supplied from the enhanced screen determination unit 8, or is a screen within the range to be deleted from the B picture. Determine if it is a number. If the screen number is the same or within the range, the supplied encoded data is output as it is, but if the screen number is out of the range, the supplied encoded data is supplied to the B picture skip unit 23.
- the B picture skip unit 23 skips the supplied encoded data when the picture type of the encoded data supplied from the display size determination unit 21 or the emphasized video determination unit 22 is a B picture. Alternatively, when the picture type of the supplied encoded data is an I picture or a P picture, it is output as it is.
- the load reducing unit 20 determines whether each video signal being decoded corresponds to a video that guides the user's line of sight or is within the range, and the corresponding video is directed to the user's line of sight. A complete decoding process is performed using all the pictures, the B picture and the P picture. On the other hand, if the situation does not apply, the user does not look much, so the B picture is thinned out and the decoding process is performed using only the I picture and P picture.
- FIG. 7 is a flowchart showing a processing flow of the decoder according to the present embodiment.
- P represents a small screen number on which video is displayed when encoded data being processed is decoded
- S represents an emphasized screen number that directs the user's line of sight.
- step S11 The supplied encoded data is input (step S11), and when the display size of the encoded data is smaller than a predetermined threshold (step S12 / NO), the encoded data of the B picture is skipped (step S14), and step Proceed to S15.
- step S12 if the supplied encoded data is larger than the predetermined threshold (step S12 / YES), it is determined whether the small screen number (P) of the supplied encoded data is close to the emphasized screen number (S) (step). S13). For example, the determination is performed according to an expression represented by S-3 ⁇ P ⁇ S + 3. That is, it is determined whether it corresponds to three small screens before and after the small screen to be emphasized.
- step S13 When the small screen number (P) of the supplied encoded data is far from the emphasized screen number (S) (step S13 / NO), the encoded data of the B picture is skipped (step S14), and the process proceeds to step S15. On the other hand, when the small screen number (P) of the supplied encoded data is close to the emphasized screen number (S) (step S13 / YES), the process proceeds to step S15.
- variable length decoding (step S15), inverse quantization (step S16), inverse DCT (step S17), and picture rearrangement (step S18) are processed by conventional MPEG decoding.
- the video signal performed in the same manner as the processing is output (step S19).
- the multi-screen generation unit 6 resizes the supplied video signal for each small screen to the size of the small screen, synthesizes it at a predetermined position of the multi-display, and outputs it to the display unit 7 including a liquid crystal display, a plasma display, etc. To do.
- the range for that is assumed to be preset or set in advance by the user. For example, when highlighting only a small screen to be watched, the range is set to zero. Further, when it is desired to highlight five small screens that are separated from the four small screens to be watched, the range is set to 5. Of course, the range may be 1/2/3 direction instead of four directions.
- FIG. 8 is a block diagram illustrating a configuration of the multi-screen generation unit 6 according to the present embodiment.
- the multi-screen generating unit 6 includes a resizing unit 61, a brightness adjusting unit 62, and a combining unit 63.
- the resizing unit 61 and the brightness adjusting unit 62 are provided corresponding to each small screen, and are configured to supply respective outputs to the combining unit 63.
- the multi-screen generation unit 6 supplies each video signal supplied from the decoding processing unit 5 to the corresponding resizing unit 61.
- the resizing unit 61 obtains the display size (the number of pixels in the horizontal direction and the number of lines in the vertical direction) of the video to be displayed. When the horizontal size is longer than the aspect ratio of the small screen area, the resizing unit 61 matches the number of horizontal pixels. If the image is resized and is longer than the aspect ratio of the small screen area, the image is resized according to the number of vertical pixels.
- the resizing unit 61 supplies each resized video signal to the luminance adjusting unit 62.
- the brightness adjustment unit 62 determines whether the small screen number on which the video signal supplied from the resizing unit 61 is displayed is within the range around the screen number to be highlighted. Video that maintains or increases the brightness of the resized video if it is within the area around the highlighted screen number, or otherwise reduces the brightness of the resized video so that the user does not look too much The signal is supplied to the synthesis unit 63.
- the brightness can be adjusted stepwise in inverse proportion to the distance from the highlighted small screen, and the display can be made such that the brightness decreases as the distance from the highlighted image increases.
- the synthesizing unit 63 synthesizes each video signal supplied from the luminance adjusting unit 62 with the display position of the screen corresponding to the small screen number, and outputs it to the display unit 7 as a video signal for one screen.
- FIG. 9 is a flowchart showing a processing procedure of the multi-screen generation unit 6.
- Each video signal is received from the decoding processing unit 5 (step S21), the display size of the displayed video (the number of pixels in the horizontal direction, the number of lines in the vertical direction) is acquired, and the horizontal ratio is smaller than the aspect ratio of the small screen area. If it is long, the image is resized according to the number of horizontal pixels, and if it is longer than the aspect ratio of the small screen area, it is resized according to the number of vertical pixels (step S22).
- step S23 it is determined whether or not the small screen number (P) on which each resized video signal is displayed is within the range around the screen number (S) to be highlighted (step S23). If it is within the range around the highlighted screen number (step S23 / YES), a video signal in which the luminance of the resized video is maintained or increased is generated (step S24). Otherwise (step S23 / NO), a video signal is generated in which the luminance of the resized video is lowered so that the user does not look too much (step S25). For example, the determination is performed according to an expression represented by S-5 ⁇ P ⁇ S + 5. That is, it is determined whether it corresponds to five small screens before and after the small screen to be emphasized.
- each video signal whose brightness has been adjusted is synthesized with the display position of the screen corresponding to the small screen number (step S26) and output to the display unit 7 as a video signal for one screen (step S27). ).
- the video content stored in the data recording device has been described.
- the multi-screen display device has a TV broadcast reception function, an Internet connection function, or an external video output device that plays back video content.
- video content captured by these functions can be displayed in a multi-display without being stored in the data recording device.
- all the B pictures of the video whose display size is equal to or smaller than the predetermined threshold value are deleted.
- the display size determination ON / OFF the video other than the highlight target Only the B picture may be deleted.
- the video content encoding method has been described as MPEG4.
- the present invention can also be applied to other encoding methods such as H.264.
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Abstract
Description
しかし、復号処理部における処理負荷軽減を行わなければ、一動画当りの復号処理が大きくなり、最大表示動画の数が減ってしまうという問題がでてくる。
本発明のマルチ画面表示装置は、複数の映像を単一画面に表示するマルチ画面表示装置であって、前記複数の映像のうち強調する映像を表示する画面を指定する強調画面決定部と、前記強調画面決定部で決定された画面に表示される映像以外に対する復号処理部における処理負荷を削減する負荷軽減部と、を備えたものである。
さらに、前記負荷軽減部は、前記映像が、フレーム内で情報圧縮された2次元圧縮映像データであるIピクチャと、時間的に前方向のIピクチャによる動き補償を加えて情報圧縮された3次元圧縮映像データであるPピクチャと、時間的に前後方向のIピクチャまたはPピクチャによる動き補償を加えて情報圧縮された3次元圧縮映像データであるBピクチャとを混在して含む符号化データであった場合、前記強調画面決定部で決定された画面に表示される映像以外に対して、Bピクチャの削除を行うことにより復号処理における処理負荷を削減する。
選択された映像コンテンツは、データ蓄積装置から読み出され、それぞれ小画面のサイズにリサイズされて、表示装置の1画面に合成され、マルチ表示がなされる。
ここで、選択された映像コンテンツの個数が小画面の個数より多い場合には、マルチ表示を複数回に分けて実行し、さもなければ表示対象の映像コンテンツのない小画面に何も表示させないか、あるいは、画面割を変更するようにしてもよい。
一般に、人がマルチ表示された映像コンテンツを見る場合、その視線は左から右へ、上から下へと移動することが知られており、本発明では、この性質を利用するため、ユーザが注視している小画面に表示された映像が他の小画面に表示された映像より相対的に強調されるようにし、この強調した映像を表示する小画面を一定の時間間隔で他の小画面に移動させてユーザの注意をひきつけることによって、ユーザの視線を誘導する。
図1は、視線の移動方向が同一方向横向きに移動する場合であり、走査型横移動と呼ぶ。図2は、視線の移動方向がFの字を描くように移動する場合であり、Fの字型移動と呼ぶ。また、図3は、視線の移動方向が左右方向に交互に繰り返す途切れのない場合であり、ジグザグ型横移動と呼ぶ。
図2および3の例でも同様に注視すべき順番号の小画面およびその周辺の小画面の強調をその他の小画面よりも際立たせるようにしている。
また、横方向への移動だけでなく、縦方向に移動する走査型縦移動、ジグザグ型縦移動であってもよい。
図4は、本実施形態に係るマルチ画面表示装置の概略構成図である。同図において、マルチ画面表示装置は、映像選択部1、表示位置決定部2、表示データ抽出部3、データ蓄積部4、復号処理部5、マルチ画面生成部6、表示部7、強調画面決定部8を含んで構成されている。
このために、次の情報を既定値として、あるいはユーザによって予め設定しておく。
遷移タイミングは、強調する小画面を変更する時間間隔を示すものであり、既定値としては、1秒を設定する。
遷移順番号テーブルは、強調表示する順番の順序で、強調表示する小画面の画面番号を記憶するテーブルであり、画面分割数と視線の移動方向が決定されたときに設定される。
強調表示する順番号は、上述の3種類の視線の移動方向あるいはユーザが設定したものから決定される。
例えば、図1の走査型横移動の場合には、小画面番号と強調表示する順番号とは同じになるが、図2や図3の場合には、小画面番号と強調表示する順番号とは一致したものとはならない。
ここで、強調表示する順番が遷移順番号テーブルの最後まできた場合には、遷移順番号テーブルの先頭へ戻してカウントアップさせるようにする。
復号処理部5は、供給される複数の符号化データ(映像信号データ)を同時に復号処理するために、各符号化データに対応した複数の復号器を備えている。
単一の符号化データを復号処理する各復号器は、表示データ抽出部3から供給された符号化データを復号処理して得た映像出力とその映像が表示される小画面の画面番号とをマルチ画面生成部6へ供給する。
以下では、単一の符号化データを復号処理する復号器について説明する。
多重化分離器12は、符号化データのヘッダを解析して、I,P,Bタイプの符号の場合には、ピクチャタイプ、水平方向の画素数、垂直方向のライン数および符号化データを負荷軽減部20に供給する。また、動きベクトルの場合には、その動きベクトルおよび符号化モードを動き予測部18に供給する。
逆量子化器14は、符号化側にて量子化された変換係数の符号を元の変換係数に逆変換するものであり、多重化分離器12からの量子化ステップサイズにて逆量子化し、逆DCT部15に供給する。
ピクチャ並び替え部17は、このフレームバッファからピクチャの順序を整え、表示すべき順に読み出した映像信号を出力する。
例えば、注視する小画面についてのみBピクチャの削除を行わないときには、範囲をゼロに設定する。また、注視する小画面の四方に3つはなれた小画面もBピクチャの削除を行わないときには、範囲を3と設定する。勿論、範囲は、四方ではなく1/2/3方向であっても構わない。
表示サイズ判定部21は、供給された符号化データの表示サイズ(水平方向の画素数および垂直方向のライン数)を多重化分離器12から受け取って、この表示サイズが所定の閾値以下であるかを判定する。
所定の閾値以下である場合には、供給された符号化データをBピクチャスキップ部23に供給する。また、所定の閾値以上の場合には、供給された符号化データを強調映像判定部22に供給する。
画面番号が同じか範囲内であれば、供給された符号化データをそのまま出力するが、画面番号が範囲外であれば、供給された符号化データをBピクチャスキップ部23に供給する。
逆に、該当しない場合には、ユーザがあまり視線を向けないので、Bピクチャを間引いて、Iピクチャ、Pピクチャのみを用いて、復号処理を行なわせるようにする。
以後の説明における各記号について、Pは処理中の符号化データが復号されたときの映像が表示される小画面番号、Sはユーザに対して視線を向けさせる強調画面番号を表すものとする。
例えば、S-3≦P≦S+3で表わされる式に従って判別を行う。すなわち、強調すべき小画面の前後3つの小画面に該当するかを判定する。
他方、供給された符号化データの小画面番号(P)が強調画面番号(S)に近い場合(ステップS13/YES)、ステップS15へ進む。
マルチ画面生成部6は、供給された各小画面に対する映像信号を小画面のサイズにリサイズして、マルチ表示の所定の位置に合成して、液晶ディスプレイ、プラズマディスプレイなどよりなる表示部7へ出力する。
例えば、注視する小画面についてのみ強調表示するときには、範囲をゼロに設定する。また、注視する小画面の四方に5つはなれた小画面も強調表示させたいときには、範囲を5と設定する。勿論、範囲は、四方ではなく1/2/3方向であっても構わない。
リサイズ部61は、表示される映像の表示サイズ(水平方向の画素数、垂直方向のライン数)を取得し、小画面の領域のアスペクト比よりも横に長い場合、横の画素数に合わせてリサイズされ、小画面の領域のアスペクト比よりも縦に長い場合、縦の画素数に合わせてリサイズする。
リサイズ部61は、リサイズされた各映像信号を輝度調整部62に供給する。
強調表示される画面番号の周辺の範囲内であれば、リサイズされた映像の輝度を維持もしくは高くし、さもなければ、ユーザがあまり視線を向けないようにリサイズされた映像の輝度を低くした映像信号を合成部63に供給する。
復号処理部5から各映像信号を受け取って(ステップS21)、表示される映像の表示サイズ(水平方向の画素数、垂直方向のライン数)を取得し、小画面の領域のアスペクト比よりも横に長い場合、横の画素数に合わせてリサイズされ、小画面の領域のアスペクト比よりも縦に長い場合、縦の画素数に合わせてリサイズする(ステップS22)。
強調表示される画面番号の周辺の範囲内であれば(ステップS23/YES)、リサイズされた映像の輝度を維持もしくは高くした映像信号を生成する(ステップS24)。
さもなければ(ステップS23/NO)、ユーザがあまり視線を向けないようにリサイズされた映像の輝度を低くした映像信号を生成する(ステップS25)。
例えば、S-5≦P≦S+5で表わされる式に従って判別を行う。すなわち、強調すべき小画面の前後5つの小画面に該当するかを判定する。
さらに、ユーザの視線を自然な移動方向に誘導させることにより、所望の映像が選択しやすくなった。
Claims (4)
- 複数の映像を単一画面に表示するマルチ画面表示装置において、前記複数の映像のうち強調する映像を表示する画面を指定する強調画面決定部と、前記強調画面決定部で決定された画面に表示される映像以外に対する復号処理部における処理負荷を削減する負荷軽減部と、を備えることを特徴とするマルチ画面表示装置。
- 請求項1に記載のマルチ画面表示装置において、前記負荷軽減部は、前記映像の表示サイズが所定の大きさよりも小さい場合に、該映像に対する復号処理部における処理負荷を削減することを特徴とするマルチ画面表示装置。
- 請求項1または2に記載のマルチ画面表示装置において、前記強調画面決定部は、強調表示を行う画面を所定時間おきに決定することを特徴とするマルチ画面表示装置。
- 請求項1、2または3に記載のマルチ画面表示装置において、前記映像が、フレーム内で情報圧縮された2次元圧縮映像データであるIピクチャと、時間的に前方向のIピクチャによる動き補償を加えて情報圧縮された3次元圧縮映像データであるPピクチャと、時間的に前後方向のIピクチャまたはPピクチャによる動き補償を加えて情報圧縮された3次元圧縮映像データであるBピクチャとを混在して含む符号化データであった場合、前記負荷軽減部は、前記強調画面決定部で決定された画面に表示される映像以外に対して、Bピクチャの削除を行うことにより復号処理における処理負荷を削減することを特徴とするマルチ画面表示装置。
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JP2009550511A JPWO2009093557A1 (ja) | 2008-01-25 | 2009-01-20 | マルチ画面表示装置 |
EP09703362A EP2239941A1 (en) | 2008-01-25 | 2009-01-20 | Multi-screen display |
CN2009801028196A CN101926168A (zh) | 2008-01-25 | 2009-01-20 | 多屏幕显示设备 |
US12/864,462 US20100295923A1 (en) | 2008-01-25 | 2009-01-20 | Multi-screen displaying apparatus |
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US20120281748A1 (en) * | 2011-05-02 | 2012-11-08 | Futurewei Technologies, Inc. | Rate Control for Cloud Transcoding |
US9253281B2 (en) * | 2011-05-23 | 2016-02-02 | Verizon Patent And Licensing Inc. | Cells and/or vantage points in streaming media |
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JPH07123383A (ja) * | 1993-10-26 | 1995-05-12 | Canon Inc | テレビ会議用端末装置 |
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JP2007295047A (ja) * | 2006-04-20 | 2007-11-08 | Matsushita Electric Ind Co Ltd | 映像処理装置、映像制御装置および映像処理方法 |
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- 2009-01-20 WO PCT/JP2009/050719 patent/WO2009093557A1/ja active Application Filing
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JPH11252520A (ja) * | 1998-02-27 | 1999-09-17 | Sony Corp | 受信装置、送信装置および放送システム |
JP2000156845A (ja) * | 1998-11-19 | 2000-06-06 | Kenwood Corp | 映像用光ディスク再生装置 |
JP2000299867A (ja) | 1999-04-13 | 2000-10-24 | Oki Electric Ind Co Ltd | 動画像復号装置 |
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CN101926168A (zh) | 2010-12-22 |
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JPWO2009093557A1 (ja) | 2011-05-26 |
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