JP3823884B2 - Large screen display method - Google Patents

Description

すると、表示処理部８６２の処理性能が最も遅いので、これに合わせてビデオデータ量を変更する。
解像度６４０×４８０、２４ビット／ピクセルのビデオの１フレーム当たりのデータ量は
６４０×４８０×２４＝７，３７２，８００（ｂｉｔ）＝９２１，６００（ｂｙｔｅ）
として求められ、また、１秒当たりのビデオデータ量は
９２１，６００×３０＝２７，６４８，０００（ｂｙｔｅ／ｓｅｃ）
となる。
したがって、圧縮率、フレームレート、解像度のいづれかを変更してビデオデータ量を減らす必要がある。
ここでは、ビデオデータ処理性能を各表示処理部の処理速度としているが、ビデオが各画面にまたがる場合の処理面積の違いからくる処理性能差も同様に扱うことができる。
【００２９】
まず、圧縮率を変更する場合について説明する。
ビデオデータ処理性能が１５，０００，０００（ｂｙｔｅ／ｓｅｃ）で、ビデオデータ量は２７，６４８，０００（ｂｙｔｅ／ｓｅｃ）であるので、圧縮率を１／２とすれば、ビデオデータ量は１３，８２４，０００（ｂｙｔｅ／ｓｅｃ）＜１５，０００，０００（ｂｙｔｅ／ｓｅｃ）になるので処理可能となる。
そこでビデオデータ量変更手段８２が圧縮率を１／２にするようにビデオデータ生成手段８１に指示し、ビデオデータ生成手段８１は圧縮率１／２のビデオデータを生成して各表示処理部８６１乃至８６４に送信し、各表示処理部が表示処理を行なうことにより、解像度６４０×４８０、２４ビット／ピクセル、３０フレーム／秒でビデオの表示を行なうことができる。
【００３０】
次に、解像度を変更する場合について説明する。
圧縮率の場合と同様にデータ量を半分にするので、縦横それぞれの解像度を１／√２倍した解像度にする。
６４０×１／√２＝４５２．５４８３４≒４５２
４８０×１／√２＝３３９．４１１２５≒３３９
そこでビデオデータ量変更手段８２が解像度を４５２×３３９にするようにビデオデータ生成手段８１に指示し、ビデオデータ生成手段８１は解像度を４５２×３３９のビデオデータを各表示処理部８６１乃至８６４に送信し、各表示処理部が表示を行なうことにより、３０フレーム／秒でビデオ表示を行なうことができる。
【００３１】
最後に、フレームレートを変更する場合について説明する。
圧縮率、解像度の場合と同様にデータ量を半分にすればよいので、ここではフレームレートを半分にする。
そこで、ビデオデータ量変更手段８２はフレームレートを１５フレーム／秒にするようにビデオデータ生成手段８１に指示し、ビデオデータ生成手段８１は１５フレーム／秒間隔でビデオデータを各表示処理部８６１乃至８６４に送信し、各表示処理部が表示処理を行なうことにより、１５フレーム／秒でビデオ表示を行なうことができる。
【００３２】
実施の形態８．
本発明の第８の実施の形態について、図１０に基づいて説明する。
図１０は、本実施の形態における大画面表示装置の構成図である。
図において、９０は大画面に表示するビデオデータ、９１はビデオデータ１フレームに対して表示画像を生成する画像生成処理を開始させる処理開始時間を付加するタイムスタンプ付加手段、９２は処理開始時間を付加されたビデオデータを送信するビデオデータ送信手段、９３はタイムスタンプ付加手段９１、ビデオデータ送信手段９２を備えた表示制御部である。
また、９４１乃至９４４は表示画像を生成する画像生成処理の開始をビデオデータに付加された処理開始時間に指示するタイムスタンプ判定手段、９５１乃至９５４はビデオデータに付加された処理開始時間に基づいたタイムスタンプ判定手段の指示に従ってビデオデータから表示画像を生成する画像生成処理を開始して、その生成された表示画像に各ディスプレイの表示を書き換える画像生成手段、９６１乃至９６４はタイムスタンプ判定手段９４１乃至９４４と、画像生成手段９５１乃至９５４を備えた表示処理部である。９７１乃至９７４は各表示処理部の画像生成手段が生成した表示画像を表示するディスプレイである。
表示処理部９６１乃至９６４が行う表示処理は、画像生成手段９５１乃至９５４が行う、例えば転送されたビデオデータに適用された圧縮の解除、解像度の変更などを処理した表示画像を生成する画像生成処理と、その生成された表示画像を各ディスプレイ画面に表示する書き換え処理である。画面間で書き換え処理の同期を図るため、各画像生成手段で表示画像を生成する画像生成処理が同時に終了するように、処理するビデオデータの転送時間および表示画像を生成する画像生成処理時間を考慮してタイムスタンプ付加手段９１は処理開始時間を付加する。
なお、転送時間はビデオデータ量とデータ転送速度、また表示画像を生成する画像生成処理時間はビデオデータ量と各画像生成手段の単位時間当たりのビデオデータ処理量に基づいて算出でき、書き換え処理を同期させる時刻から表示画像を生成する画像生成処理時間だけ前の時刻を処理開始時間とすればよい。
【００３３】
次に、本実施の形態の動作について説明する。
表示制御部９３では、ビデオデータの１フレーム毎に表示処理部９６１乃至９６４でのビデオデータ処理量とビデオデータ量に基づいて得られる、各表示処理部が表示画像を生成する画像生成処理を開始する処理開始時間をタイムスタンプ付加手段にて付加する。各フレームの表示画像の書き換え処理が行われる時間間隔は、表示処理部の画像生成手段が１フレームの表示画像を生成する画像生成処理に要する時間以上となるように設定する。
表示処理部９６１乃至９６４ではビデオデータを受信後、この処理開始時間に達したならば、各々の処理を開始する。もし、ビデオデータの受信後、ビデオデータに付加された処理開始時間をチェックし、既にその時刻を過ぎていた場合には、そのフレームのビデオデータは破棄し、表示処理は行なわない。
【００３４】
実施の形態９．
本発明の第９の実施の形態について、図１１、図１２に基づいて説明する。
図１１は本実施の形態に係わる大画面表示装置の構成図である。
図において、１０２は表示切替部に指示して表示処理部とディスプレイとの接続を切替える表示切替制御手段、１０３は座標変換手段の座標変換パラメータを変更する座標変換パラメータ制御手段、１０１０は表示切替制御手段１０２の指示に従って表示処理部とディスプレイとの接続関係の切替えを行なう表示切替部である。
その他の構成要素は、図１に記載した構成要素と同一である。
また、図１２は本実施の形態の動作を説明するための図である。
【００３５】
ここで、座標変換パラメータについて説明する。座標変換手段は描画データに対して大画面の座標から大画面を構成するディスプレイ上でのローカルな座標に座標変換を行なう。座標変換は大画面上での座標（ｇｘ，ｇｙ）を大画面を構成するあるディスプレイ上でのローカルな座標（ｌｘ，ｌｙ）に変換する場合、大画面の座標系でのその画面の左上端の座標を（ｏｆｆｓｅｔｘ，ｏｆｆｓｅｔｙ）とすると、
ｌｘ＝ｇｘ−ｏｆｆｓｅｔｘ
ｌｙ＝ｇｙ−ｏｆｆｓｅｔｙ
となる。
この（ｏｆｆｓｅｔｘ，ｏｆｆｓｅｔｙ）を座標変換パラメータと呼ぶことにする。
【００３６】
次に、動作について説明する。
最初、表示処理部１０９１乃至１０９４が、表示切替部１０１０を通してそれぞれディスプレイ１０１１１乃至１０１１４に接続されて動作中であり、表示処理部１０９５は予備用の表示処理部として待機していたと仮定する。
即ち、表示処理部１０９１乃至１０９４は表示制御部１０５からマルチキャストにより送信される描画データ１０１を受信し、それぞれディスプレイ１０１１１乃至１０１１４に相当する大画面上の画面位置の画像を生成して表示を行っている。
各表示処理部の座標変換手段１０７１乃至１０７４の座標変換パラメータは、それぞれ、（０，１０２４），（０，０），（１２８０，０），（１２８０，１０２４）と設定されている。
予備機としての表示処理部１０９５の座標変換手段１０７５には、最初、座標変換パラメータとして（０，０）が設定されているが、いずれのディスプレイとも接続されていないため表示処理には関与していない。
ここで、表示処理部１０９４が故障したとする。この時、座標変換パラメータ制御手段１０３は予備の表示処理部１０９５の座標変換手段１０７５の座標変換パラメータを（０，０）から故障した表示処理部１０９４の座標変換手段１０７４に設定されていた（１２８０，１０２４）に変更する。
次に、表示切替制御手段１０２は表示切替部１０１０に対して表示処理部１０９４とディスプレイ１０１１４との接続を切り替えて、表示処理部１０９５とディスプレイ１０１１４とを接続するように指示する。
これにより、表示処理部１０９５は表示処理部１０９４の代替機として動作するようになり、再び、ディスプレイ１０１１４に画像が転送されて、大画面全体の表示が可能となる。
【００３７】
【発明の効果】
この発明は、以上説明したようにして構成されているので、以下に記載されるような効果を奏する。
【００４４】
また、この発明によれば、大画面表示装置を構成する各画面に対する表示処理部の表示性能を測定し、最も処理性能の遅い表示処理部に合わせてデータ送信量を変化させ、ある一定時間内に全ての画面において１フレームの描画が終了するようにしたので、画面間での同期をとることができるという効果がある。
【００４５】
さらに、この発明によれば、表示制御部が各画面に対する表示処理部に対し、表示画像を生成する画像生成処理の開始を示す処理開始時間を付加し、各表示処理部はこの処理開始時間に合わせて表示画像を生成する画像生成処理を開始するようにしたので、全ての画面で同時に同じフレームの画像が表示され、画面間での同期をとることができる。
【図面の簡単な説明】
【図１】 本発明の第１の実施の形態を示す大画面表示装置の構成図。
【図２】 本発明の第１の実施の形態を示す大画面表示装置において直線を表示する場合の処理の流れを示したフロー図。
【図３】 本発明の第２の実施の形態を示す大画面表示装置の構成図。
【図４】 本発明の第２の実施の形態を示す大画面表示装置において直線を表示する場合の処理の流れを示したフロー図。
【図５】 本発明の第３の実施の形態を示す大画面表示装置における描画データ送信順序を示す図。
【図６】 本発明の第４の実施の形態を示す大画面表示装置における描画データ送信順序を示す図。
【図７】 本発明の第５の実施の形態を示す大画面表示装置における描画データ送信順序を示す図。
【図８】 本発明の第６の実施の形態を示す大画面表示装置における描画データ送信順序を示す図。
【図９】 本発明の第７の実施の形態を示す大画面表示装置の構成図。
【図１０】 本発明の第８の実施の形態を示す大画面表示装置の構成図。
【図１１】 本発明の第９の実施の形態を示す大画面表示装置の構成図。
【図１２】 本発明の第９の実施の形態の動作を説明するための図。
【図１３】 従来の大画面表示装置の構成を示す図。
【符号の説明】
１１、２１、１０１ 描画データ
１２、２３、１０４ 描画データ送信手段
１３、２４、８５、９３、１０５ 表示制御部、
８１ ビデオデータ生成手段、８２ ビデオデータ量変更手段、８３ ビデオ処理性能測定手段
９０ ビデオデータ、９１ タイムスタンプ付加手段
８４、９２ ビデオデータ送信手段
１０２ 表示切替制御手段
１０３ 座標変換パラメータ制御手段
２２、１４１乃至１４４、１０６１乃至１０６５ 描画データ選別手段
１５１乃至１５４、２５１乃至２５４、１０７１乃至１０７５ 座標変換手段
１６１乃至１６４、２６１乃至２６４、９５１乃至９５４、１０８１乃至１０８５ 画像生成手段
１７１乃至１７４、２７１乃至２７４、８６１乃至８６４、９６１乃至，９６４、１０９１乃至１０９５ 表示処理部
１８１乃至１８４、２８１乃至２８４、８７１乃至８７４、９７１乃至９７４、１０１１１乃至１０１１４ ディスプレイ
９４１乃至９４４ タイムスタンプ判定手段
１０１０ 表示切替部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a large screen display device that forms one screen by a plurality of displays.
[0002]
[Prior art]
Currently, a large-screen display device that is widely used is a so-called multi-screen display device in which large projection displays are arranged in a matrix and displayed as a single screen. FIG. 13 is a configuration diagram of a conventional multi-screen type large screen display device disclosed in, for example, Japanese Patent Laid-Open No. Heisei 3-201080.
In the figure, 121 is a graphic storage unit for storing initial graphic data, 122 is a graphic process for performing preprocessing including coordinate conversion processing on graphic data stored in the graphic storage unit 121 and distribution to the image generation unit. Reference numerals 1231 to 1234 denote a plurality of image generation units that generate image data from the graphic data transferred from the graphic processing unit 122.
Reference numeral 124 denotes a transfer path for transferring the graphic data of the graphic processing unit 122 to the image generation units 1231 to 1234. Reference numerals 1251 to 1254 denote a plurality of image storage units for storing the image data generated by the image generation unit. Reference numeral 1264 denotes a plurality of video signal generators for generating video signals necessary for display from the image data in the image storage units 1251 to 1254, and 1271 to 1274 denote a matrix in which the video signals obtained by the video signal generators 1261 to 1264 are input. A plurality of display units arranged in
[0003]
Next, the operation will be described.
The graphic data to be displayed is stored in the graphic storage unit 121. After the graphic processing unit 122 reads out the graphic data and performs processing such as coordinate conversion, image generation connected to each display unit constituting the large screen is generated. The graphic data is transferred to the units 1231 to 1234, respectively.
The image generation units 1231 to 1234 generate image data from the graphic data and write them in the image storage units 1251 to 1254. Then, the video signal generators 1261 to 1264 read the image data from the image storage units 1251 to 1254, convert them into video signals, and finally display them on the display units 1261 to 1264.
[0004]
[Problems to be solved by the invention]
Since the conventional multi-screen type large-screen display device transfers graphic data to each image generation unit as described above, if the graphic to be displayed extends over multiple screens, all the screens that span The same graphic data must be transferred multiple times to the image generation unit, and accordingly, when the number of screens increases, the transfer amount of graphic data also increases, and the transfer time of graphic data to the image generation unit becomes longer, There was a problem that display performance deteriorated.
In addition, since coordinate conversion processing is concentrated in one graphic processing unit, the processing amount of the graphic processing unit increases drastically as the number of screens increases, so that display performance deteriorates.
In addition, since the screen rewriting time differs for each display unit depending on the transfer order of graphic data to each image generation unit, if the transfer order is fixed, the difference in rewriting processing between the screens becomes conspicuous. There was a problem.
In addition, when the video is displayed, the screen image is continuously rewritten. Therefore, when the video image straddles between the screens, the video data transfer time and display processing time are shifted between the screens due to the difference between the screens. There was a problem that the video image was corrupted due to the synchronization of the video.
Furthermore, when the image generation unit fails because the video signal generation unit and the display unit are fixedly connected, the image of the corresponding display unit is not displayed and a part of the screen is lost. there were.
[0005]
The present invention has been made to solve the above-described problems, and prevents deterioration in display performance due to an increase in the number of screens, making the rewriting shift between screens unique to multi-screens inconspicuous, and an image generation unit The purpose is to provide a large screen display method in which a part of the screen is not lost due to a failure of the device.
[0012]
[Means for Solving the Problems]
  A large screen display system according to a seventh aspect of the present invention is a large screen display device including a display processing unit connected to a plurality of displays constituting the large screen and a display control unit for controlling the display processing unit. The video processing performance measuring means for measuring the video processing performance of each display processing section, and the video data amount changing for changing the video data quantity in accordance with the display processing section with the slowest video processing performance measured by the video processing performance measuring means. Video data generating means for generating video data whose video data amount has been changed based on an instruction from the video data amount changing means, and video data transmission for transmitting the video data generated by the video data generating means to the display processing unit Means, and the display processing unit,Video data sent from the video transmission meansA display image is generated from thedisplayRewrite the display ofIt is what I did.
[0013]
  A large screen display system according to an eighth invention is a large screen display device comprising a display processing unit connected to a plurality of displays constituting the large screen and a display control unit for controlling the display processing unit. For each frame of video dataStart image generation processing to generate a display imageA time stamp adding means for adding a processing start time; and a video data transmitting means for transmitting the video data to which the processing start time is added by the time stamp adding means to the display processing section.Sent from the video transmission meansAt the processing start time added to the video dataInstructing the start of image generation processing to generate a display imageReceives instructions from time stamp determination means and time stamp determination meansSent from the video transmission meansVideo dataStart the image generation process to generate the display image from thedisplayRewrite the display ofAn image generating means is provided.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the display control unit transmits all screen data to be displayed by multicast, and each display processing unit selects and selects only the graphic drawing data displayed on the display screen under the control of the processing unit. A large screen display method will be described in which coordinate conversion is performed on the drawn data in accordance with its own screen position on the large screen, and a display image is generated and displayed.
FIG. 1 is a configuration diagram of a large-screen display device according to the first embodiment.
In the figure, 11 is drawing data of a graphic to be displayed on a large screen, 12 is a drawing data transmitting means for transmitting drawing data by multicast, and 13 is a display control unit having drawing data transmitting means.
Reference numerals 141 to 144 denote drawing data selection means for selecting only drawing data of a figure entering the own screen and sending it to the coordinate conversion means. Reference numerals 151 to 154 denote the drawing data 11 from the coordinate system of the entire large screen to the coordinate system of the own screen. Coordinate conversion means for converting to Reference numerals 161 to 164 denote image generation means for generating an image from the selected drawing data 11, reference numerals 171 to 174 denote drawing data selection means, coordinate conversion means, a display processing unit including the image generation means, and reference numerals 181 to 184 denote image generation means. It is a display for displaying images generated in 161 to 164.
FIG. 2 is a flowchart showing the flow of processing when a straight line is displayed in the large screen display device according to the first embodiment.
[0016]
In the large screen display device of this embodiment, the screen is composed of 2 × 2 displays, and the screen size of each display is 1280 × 1024 pixels, so the size of the entire screen is 2560 × 2048 pixels.
The coordinate system of each display is a coordinate system in which the upper left corner is (0, 0), the lower right corner is (1279, 1023), the large screen coordinate system is (0, 0), and the lower right corner is ( 2559, 2047).
Accordingly, the display 181 has a range of (0,1024) to (1279,2047) of the entire large screen, the display 182 has a range of (0,0) to (1279,1023) of the entire large screen, and the display 183 has a large range. The range of (1280,0) to (2559,1023) of the entire screen is displayed, and the display 184 displays the range of (1280,1024) to (2559,2047) of the entire large screen.
[0017]
Next, the operation of the present embodiment will be described by taking an example of drawing a straight line from coordinates (640, 512) to coordinates (1920, 1152) on the large screen.
In FIG. 2, first, the drawing data transmitting means 12 of the display control unit 13 transmits the straight line drawing data 11 to all the display processing units 171 to 174 by multicast.
[0018]
First, the display processing unit determines whether or not the drawing data sorting means 141 to 144 is data to be drawn on the screen of the own display connected to each display processing unit, and enters or partially enters the own screen. Is loaded with the drawing data and passed to the next coordinate conversion means.
On the other hand, when drawing is not performed at all on the screen of its own display, the drawing data is not transferred to the coordinate conversion means but discarded by the drawing data selection means. In this example, since the straight line does not pass through the screen in the display 181, the drawing data transmitted by multicast is not transferred to the coordinate conversion unit 151, but is completely discarded by the drawing data selection unit 141.
In the drawing data selection unit 142, since the straight line enters the screen of the display 182, the drawing data is transferred to the coordinate conversion unit 152.
In the drawing data selection means 143 and 144, since the straight line enters the screen of each display 183 and 184, the drawing data is passed to the coordinate conversion means 153 and 154, respectively.
[0019]
Next, the coordinate conversion means 151 to 154 perform coordinate conversion processing in order to convert the received drawing data into the coordinate system of its own display.
Here, coordinate conversion will be described. When converting the coordinates (gx, gy) on the large screen to the local coordinates (lx, ly) on the individual screens constituting the large screen, the coordinates of the upper left corner of each screen in the large screen coordinate system are changed. (Offsetx, offsety)
lx = gx-offsetx
ly = gy-offsety
Can be expressed as
The display example in FIG. 2 will be described. Since the coordinate at the upper left corner of the screen of the connected display 182 is (0, 0) in the coordinate conversion means 152, the coordinate value of the end point of the straight line is (640, 512). , (1920, 1152), the result is the same. Accordingly, the drawing data is a straight line from (640, 512) to (1920, 1152).
In the coordinate conversion means 153, since the coordinates of the upper left corner of the screen of the connected display 183 are (1280, 0), the coordinate values (640, 512), (1920, 1152) are converted into (-640, 512) and (640, 1152), respectively.
Accordingly, the drawing data is a straight line from (640, 512) to (1920, 1152) to a straight line from (−640, 512) to (640, 1152).
Further, since the coordinate at the upper left corner of the screen of the connected display 184 is (1280, 1024), the coordinate conversion means 154 performs coordinate conversion processing to obtain the coordinate values (640, 512), ( 1920, 1152) are converted into (-640, -512) and (640, 128), respectively.
Therefore, the drawing data is a straight line from (640, 512) to (1920, 1152) to a straight line from (−640, −512) to (640, 128).
In this way, each drawing data subjected to the coordinate conversion processing is transferred to the image generation means 162 to 164, and each image generation means generates a straight line image divided for each screen, and each display 182 to By drawing to 184 and drawing, a straight line from (640, 512) to (1920, 1154) is displayed.
[0020]
Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the display control unit selects the drawing data of the graphic entering each display screen, transmits only the selected drawing data to the corresponding display processing unit, and the display processing unit applies the drawing data to the display data. A large screen display method in which coordinate conversion is performed in accordance with the position of the user's screen and the display is performed on the display will be described.
FIG. 3 is a block diagram of a large screen display device according to the second embodiment of the present invention.
In the figure, 21 is the drawing data to be displayed on the large screen, 22 is the drawing data selection means for selecting only the graphic drawing data that falls within the own screen and sends it to the drawing data transmitting means, and 23 is the drawing data to each display processing section. A drawing data transmitting unit 24 for transmitting is a display control unit provided with a drawing data selecting unit 22 and a drawing data transmitting unit 23.
Reference numerals 251 to 254 denote coordinate conversion means for converting the drawing data 21 from the coordinates of the entire large screen to the local coordinates of the self-screen. Reference numerals 261 to 264 denote image generation means for generating image data from the drawing data 21 subjected to the coordinate conversion. A display processing unit 274 includes coordinate conversion units 251 to 254 and image generation units 261 to 264, and 281 to 284 are displays that display images generated by the image generation units 261 to 264.
FIG. 4 is a flowchart showing the flow of processing when a straight line is displayed in the large screen display device according to the second embodiment.
[0021]
In the large screen display device of this embodiment, the screen is composed of 2 × 2 displays, and the screen size of each display is 1280 × 1024 pixels, so the size of the entire screen is 2560 × 2048 pixels.
The coordinate system of each display is a coordinate system in which the upper left corner is (0, 0), the lower right corner is (1279, 1023), the large screen coordinate system is (0, 0), and the lower right corner is ( 2559, 2047).
Accordingly, the display 281 has a range of (0,1024) to (1279,2047) of the entire large screen, the display 282 has a range of (0,0) to (1279,1023) of the entire large screen, and the display 283 has a large range. The range of (1280,0) to (2559,1023) of the entire screen is displayed, and the display 284 displays the range of (1280,1024) to (2559,2047) of the entire large screen.
[0022]
Next, the operation of the present embodiment will be described by taking an example of drawing a straight line from coordinates (640, 512) to coordinates (1920, 1152) on the large screen.
In FIG. 4, the drawing data selection means 22 selects drawing data of a figure that falls within the screen for each display, and sends the drawing data to the display processing unit connected to the corresponding display. 23.
First, since the straight line does not pass through the screen, the display 281 is instructed to the drawing data transmitting unit 23 not to transmit drawing data to the display processing unit 271.
For the display 282, since a straight line passes through the screen, the drawing data transmitting unit 23 is instructed to transmit drawing data to the display processing unit 272.
Also in the case of the display 283, since the straight line passes through the screen, the drawing data transmission unit 23 is instructed to transmit the drawing data to the display processing unit 273.
Also in the case of the display 284, since the straight line passes through the screen, the drawing data transmission unit 23 is instructed to transmit the drawing data to the display processing unit 274.
The drawing data transmission unit 23 transmits the drawing data to the display processing units 272 to 274 of the corresponding display based on the above instructions. In each display processing unit, each coordinate conversion means 252 to 254 first performs coordinate conversion on the sent drawing data. The coordinate conversion method is as described in the first embodiment.
The coordinate conversion unit 251 does not perform a coordinate conversion process because a straight line is not drawn on the screen of the connected display 281.
In the coordinate conversion means 252, since the coordinates of the upper left corner of the screen of the connected display 282 are (0, 0), the coordinate values (640, 512) and (1920, 1152) of the end points of the straight line are the same values as they are. Therefore, the drawing data is a straight line from (640, 512) to (1920, 1152).
In the coordinate conversion unit 253, since the coordinates of the upper left corner of the screen of the connected display 283 are (1280, 0), the coordinate values (640, 512) and (1920, 1152) of the end points of the straight line are (− 640,512) and (640,1152), and the drawing data is a straight line from (−640,512) to (640,1152).
In the coordinate conversion means 254, since the coordinates of the upper left corner of the screen of the connected display 284 are (1280, 1024), the coordinate values (640, 512), (1920, 1152) of the end points of the straight line are (− 640, −512) and (640, 128), and the drawing data becomes a straight line from (−640, −512) to (640, 128).
After the coordinate conversion, each drawing data is transferred to the image generation means 262 to 264, and each image generation means 262 to 264 generates a straight line image divided for each screen, and the generated image is displayed on each display 281 to 281. It is displayed on 284 as a straight line from (640, 512) to (1920, 1154).
[0023]
Embodiment 3 FIG.
A drawing data transmission unit according to the third embodiment of the present invention will be described with reference to FIG.
FIG. 5 shows the transfer order of drawing data according to the present embodiment for a large screen display device composed of 6 × 6 screens, and the numbers indicate the transfer order for each display on the large screen. .
The drawing data transfer means according to this embodiment transfers drawing data in order from the display processing unit of the display at the center of the screen toward the display processing unit of the outside display.
Here, consider a case where image data such as a person or a landscape is displayed on a large screen display device. When image data is displayed according to the transfer order shown in this embodiment, the image is drawn so as to spread from the center of the screen to the periphery.
On the other hand, humans have the habit of seeing the center first when looking at images of people and landscapes, and then gradually looking at the surroundings, so this drawing order is the same as the movement of this person's line of sight. realizable.
[0024]
Embodiment 4 FIG.
Drawing data transmission means according to the fourth embodiment of the present invention will be described with reference to FIG.
FIG. 6 shows the drawing data transfer order according to the present embodiment for a large screen display device composed of 6 × 6 screens, and the numbers represent the transfer order for each display on the large screen. .
Consider the case where English text is displayed on a large screen display device. When drawing data of English text is transmitted in this transfer order, drawing is performed from the upper line to the lower line, and each line is drawn from left to right. This is in line with the movement of gaze when humans read English. The same applies to horizontally written Japanese sentences.
[0025]
Embodiment 5. FIG.
Drawing data transmitting means according to the fifth embodiment of the present invention will be described with reference to FIG.
FIG. 7 shows the transfer order of drawing data according to this embodiment for a large screen display device composed of 6 × 6 screens, and the numbers indicate the transfer order for each display on the large screen.
Consider the case where vertically written Japanese text is displayed on this large screen display device.
When drawing data of vertical writing Japanese text is sent in this transfer order, drawing is done from the right column to the left column, and each column is drawn from top to bottom. Along with the movement of gaze when reading text.
[0026]
Embodiment 6 FIG.
A drawing data transmission unit according to the sixth embodiment of the present invention will be described with reference to FIG.
FIG. 8 shows the transfer order of drawing data to a display on a large screen when the present invention is applied to a large screen display device composed of 6 × 6 screens. Represents the transfer order for each display.
According to the transfer order according to the present embodiment, rewriting of screens arranged in a diagonal direction can be made inconspicuous.
[0027]
Embodiment 7 FIG.
  A seventh embodiment of the present invention will be described with reference to FIG.
  FIG. 9 is a configuration diagram of the large screen display apparatus according to the present embodiment. In the figure, 81 is a video data generating means for generating video data from an input video signal, 82 is instructing the video data generating means to change the compression rate of video data, the frame interval of video data, and the resolution of video data. , A video data amount changing means for changing and controlling the transmission amount of video data per unit time, 83 a video processing performance measuring means for measuring the video data processing amount per unit time of each display processing section, and 84 a video data generating means A video data transmission means for transmitting the video data generated in 81.
  A display control unit 85 includes the video data generating unit 81, the video data amount changing unit 82, the video processing performance measuring unit 83, and the video data transmitting unit 84. 861 to 864 receive video dataIn addition to generating a display image, the generated display imageEach displayRewrite the display ofDisplay processing unit 871 to 874 generated by the display processing unitdisplayThis is a display for displaying images.
[0028]
Next, the operation will be described by taking a video display with a resolution of 640 × 480, 24 bits / pixel, 30 frames / second as an example.
Prior to display, first, the display control unit 85 uses the video processing performance measuring means 83 to measure the video data processing amount per unit time of each display processing unit. In the present embodiment, it is composed of four display processing units, so the video data processing amount of each of these display processing units is measured, and it is assumed that the measurement results are as follows.

Then, since the processing performance of the display processing unit 862 is the slowest, the video data amount is changed accordingly.
The amount of data per frame of video with a resolution of 640 × 480 and 24 bits / pixel is
640 × 480 × 24 = 7,372,800 (bits) = 921,600 (bytes)
And the amount of video data per second is
921,600 × 30 = 27,648,000 (byte / sec)
It becomes.
Therefore, it is necessary to reduce the amount of video data by changing any one of the compression rate, the frame rate, and the resolution.
Here, the video data processing performance is set as the processing speed of each display processing unit, but the processing performance difference caused by the difference in processing area when the video extends over each screen can be handled in the same manner.
[0029]
First, a case where the compression rate is changed will be described.
Since the video data processing performance is 15,000,000 (byte / sec) and the video data amount is 27,648,000 (byte / sec), the video data amount is 13 if the compression rate is halved. , 824,000 (byte / sec) <15,000,000 (byte / sec), so that processing is possible.
Therefore, the video data amount changing means 82 instructs the video data generating means 81 to halve the compression ratio, and the video data generating means 81 generates video data with a compression ratio of 1/2 and displays each display processing unit 861. To 864, and each display processing unit performs display processing, whereby video can be displayed at a resolution of 640 × 480, 24 bits / pixel, 30 frames / second.
[0030]
Next, a case where the resolution is changed will be described.
Since the data amount is halved as in the case of the compression rate, the resolution is obtained by multiplying the vertical and horizontal resolutions by 1 / √2.
640 × 1 / √2 = 452.54834≈452
480 × 1 / √2 = 339.41125≈339
Therefore, the video data amount changing unit 82 instructs the video data generating unit 81 to set the resolution to 452 × 339, and the video data generating unit 81 transmits the video data having the resolution of 452 × 339 to each display processing unit 861 to 864. As each display processing unit performs display, video display can be performed at 30 frames / second.
[0031]
Finally, a case where the frame rate is changed will be described.
Since the data amount may be halved as in the case of the compression rate and resolution, the frame rate is halved here.
Therefore, the video data amount changing unit 82 instructs the video data generating unit 81 to set the frame rate to 15 frames / second, and the video data generating unit 81 converts the video data to the display processing units 861 to 861 at intervals of 15 frames / second. 864, and each display processing unit performs display processing, whereby video display can be performed at 15 frames / second.
[0032]
Embodiment 8 FIG.
  An eighth embodiment of the present invention will be described with reference to FIG.
  FIG. 10 is a configuration diagram of the large screen display device in the present embodiment.
  In the figure, 90 is video data to be displayed on a large screen, and 91 is one frame of video data.Start the image generation process to generate the display imageTime stamp adding means for adding the processing start time, 92 is a video data transmitting means for transmitting the video data to which the processing start time is added, and 93 is a display control unit including the time stamp adding means 91 and the video data transmitting means 92. is there.
  In addition, 941 to 944 areStart the image generation process to generate the display imageAt the processing start time added to the video dataDirectTime stamp determination means 951 to 954Based on processing start time added to video dataAccording to the instructions of the time stamp determination meansAn image generation process for generating a display image from video data is started, and each generated display image isdisplayRewrite the display ofAn image generation unit 961 to 964 is a display processing unit including time stamp determination units 941 to 944 and image generation units 951 to 954.Reference numerals 971 to 974 denote displays for displaying display images generated by the image generation means of each display processing unit.
  The display processing performed by the display processing units 961 to 964 is performed by the image generation means 951 to 954, for example, image generation processing for generating a display image that has been processed by releasing the compression applied to the transferred video data, changing the resolution, and the like. And a rewriting process for displaying the generated display image on each display screen. In order to synchronize the rewriting process between the screens, consider the transfer time of the video data to be processed and the image generation processing time to generate the display image so that the image generation process to generate the display image at each image generation means is completed at the same time. Then, the time stamp adding means 91 adds the processing start time.
  The transfer time can be calculated based on the video data amount and the data transfer rate, and the image generation processing time for generating the display image can be calculated based on the video data amount and the video data processing amount per unit time of each image generating means. The time before the image generation processing time for generating the display image from the time of synchronization may be set as the processing start time.
[0033]
  Next, the operation of the present embodiment will be described.
  In the display control unit 93, the display processing units 961 to 964Each display processing unit obtained based on the video data processing amount and the video data amount starts image generation processing for generating a display image.The processing start time is added by the time stamp adding means. Of each frameThe display image is rewrittenTime intervalIsDisplay processingImage generation meansOne frameImage generation to generate display imageSet to be longer than the time required for processing.
  The display processing units 961 to 964 start each processing when the processing start time is reached after receiving the video data. If the processing start time added to the video data is checked after reception of the video data and the time has already passed, the video data of the frame is discarded and the display processing is not performed.
[0034]
Embodiment 9 FIG.
A ninth embodiment of the present invention will be described with reference to FIGS.
FIG. 11 is a configuration diagram of a large screen display apparatus according to the present embodiment.
In the figure, 102 is a display switching control means for instructing the display switching section to switch the connection between the display processing section and the display, 103 is a coordinate transformation parameter control means for changing the coordinate transformation parameter of the coordinate transformation means, and 1010 is a display switching control. This is a display switching unit that switches the connection relationship between the display processing unit and the display in accordance with an instruction from the means 102.
The other components are the same as those described in FIG.
FIG. 12 is a diagram for explaining the operation of the present embodiment.
[0035]
Here, the coordinate conversion parameters will be described. The coordinate conversion means converts the coordinates of the drawing data from the coordinates on the large screen to the local coordinates on the display constituting the large screen. In the coordinate conversion, when the coordinates (gx, gy) on the large screen are converted into the local coordinates (lx, ly) on a certain display constituting the large screen, the upper left corner of the screen in the large screen coordinate system. If the coordinates of (offsetx, offset) are
lx = gx-offsetx
ly = gy-offsety
It becomes.
This (offsetx, offset) will be referred to as a coordinate conversion parameter.
[0036]
Next, the operation will be described.
First, it is assumed that the display processing units 1091 to 1094 are connected to the displays 10111 to 10114 through the display switching unit 1010 and are operating, and the display processing unit 1095 is waiting as a spare display processing unit.
That is, the display processing units 1091 to 1094 receive the drawing data 101 transmitted by multicast from the display control unit 105, generate images at the screen positions on the large screen corresponding to the displays 10111 to 10114, respectively, and display them. Yes.
The coordinate conversion parameters of the coordinate conversion means 1071 to 1074 of each display processing unit are set to (0, 1024), (0, 0), (1280, 0), (1280, 1024), respectively.
In the coordinate conversion means 1075 of the display processing unit 1095 as a spare machine, (0, 0) is initially set as a coordinate conversion parameter, but since it is not connected to any display, it is involved in display processing. Absent.
Here, it is assumed that the display processing unit 1094 has failed. At this time, the coordinate conversion parameter control unit 103 has set the coordinate conversion parameter of the coordinate conversion unit 1075 of the spare display processing unit 1095 from (0, 0) to the coordinate conversion unit 1074 of the failed display processing unit 1094 (1280). , 1024).
Next, the display switching control unit 102 instructs the display switching unit 1010 to switch the connection between the display processing unit 1094 and the display 10114 and connect the display processing unit 1095 and the display 10114.
As a result, the display processing unit 1095 operates as a substitute for the display processing unit 1094, and the image is transferred again to the display 10114 so that the entire large screen can be displayed.
[0037]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0044]
Further, according to the present invention, the display performance of the display processing unit for each screen constituting the large screen display device is measured, and the data transmission amount is changed in accordance with the display processing unit having the slowest processing performance, and within a certain fixed time. In addition, since drawing of one frame is completed on all screens, there is an effect that synchronization can be established between the screens.
[0045]
  Furthermore, according to the present invention, the display control unit performs the display processing unit for each screen.The image generation process that generates the display imageIndicates startProcessing start timeAnd each display processing unitProcessing start timeTo suitImage generation processing for generating display imagesSince the same frame image is simultaneously displayed on all screens, synchronization between the screens can be achieved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a large-screen display device showing a first embodiment of the present invention.
FIG. 2 is a flowchart showing a flow of processing when a straight line is displayed in the large screen display device showing the first embodiment of the present invention.
FIG. 3 is a configuration diagram of a large screen display device showing a second embodiment of the present invention.
FIG. 4 is a flowchart showing a flow of processing when a straight line is displayed in the large screen display device showing the second embodiment of the present invention.
FIG. 5 is a diagram showing a drawing data transmission order in a large-screen display device showing a third embodiment of the present invention.
FIG. 6 is a diagram showing a drawing data transmission order in a large-screen display device showing a fourth embodiment of the present invention.
FIG. 7 is a diagram showing a drawing data transmission order in a large-screen display device showing a fifth embodiment of the present invention.
FIG. 8 is a diagram showing a drawing data transmission order in a large-screen display device showing a sixth embodiment of the present invention.
FIG. 9 is a configuration diagram of a large screen display device showing a seventh embodiment of the present invention.
FIG. 10 is a configuration diagram of a large-screen display device showing an eighth embodiment of the present invention.
FIG. 11 is a configuration diagram of a large screen display device showing a ninth embodiment of the present invention.
FIG. 12 is a diagram for explaining the operation of the ninth embodiment of the present invention.
FIG. 13 is a diagram showing a configuration of a conventional large screen display device.
[Explanation of symbols]
11, 21, 101 Drawing data
12, 23, 104 Drawing data transmission means
13, 24, 85, 93, 105 Display control unit,
81 video data generating means 82 video data amount changing means 83 video processing performance measuring means
90 video data, 91 time stamp addition means
84, 92 Video data transmission means
102 Display switching control means
103 Coordinate transformation parameter control means
22, 141 to 144, 1061 to 1065 Drawing data selection means
151 to 154, 251 to 254, 1071 to 1075 Coordinate conversion means
161 to 164, 261 to 264, 951 to 954, 1081 to 1085 Image generation means
171 to 174, 271 to 274, 861 to 864, 961 to 964, 1091 to 1095 Display processing unit
181 to 184, 281 to 284, 871 to 874, 971 to 974, 10111 to 10114 display
941 to 944 Time stamp determination means
1010 Display switching unit

Claims (3)

In a large screen display device comprising a display processing unit connected to each of a plurality of displays constituting a large screen and a display control unit for controlling the display processing unit,
The display control unit includes a video processing performance measuring unit that measures the video processing performance of each display processing unit,
Video data amount changing means for changing the video data amount in accordance with the display processing unit having the slowest video processing performance measured by the video processing performance measuring means;
Video data generating means for generating video data whose video data amount has been changed based on an instruction from the video data amount changing means;
Video data transmitting means for transmitting the video data generated by the video data generating means to a display processing unit;
The display processing unit, a large-screen display system, characterized in that rewrite the display generated in the display of the display image from the video data transmitted from said video transmitting means to the generated display image. In a large screen display device comprising a display processing unit connected to each of a plurality of displays constituting a large screen and a display control unit for controlling the display processing unit,
The display controller, a time stamp adding means for adding the processing start time to start image generating process for generating a display image for each frame of video data,
Video data transmitting means for transmitting the video data to which the processing start time is added by the time stamp adding means to the display processing unit;
The display processing unit includes a time stamp determination unit that instructs to start an image generation process for generating a display image at a processing start time added to the video data transmitted from the video transmission unit ;
Image generation means for starting an image generation process for generating a display image from video data sent from the video transmission means in response to an instruction from the time stamp determination means and rewriting the display on the display to the generated display image is provided. large-screen display system, characterized in that. The display processing unit does not perform image generation processing for generating a display image from the video data when the time at which the video data is received from the video transmission means has passed the processing start time added to the video data. 3. The large screen display system according to claim 2, wherein the video data frame is discarded and the frame of the video data is not displayed on the display.

Images