JP4515648B2 - Image display in response to viewer display requests - Google Patents

Description

【００５３】
上式（１）は、データのビット数が８（２５６階調）のときのＲＧＢデータからＹＣｂＣｒデータへの変換式であり、ＪＰＥＧ圧縮でよく用いられる。ＲＧＢデータからＹＣｂＣｒへの変換は、画像データ入力部１１０へデータを入力する前に、図示しない画像入力装置において予め行うようにしてもよいし、画像データ入力部１１０へ一旦ＲＧＢデータを入力した後に図示しない画像変換部において、サーバ１００Ａの負荷の小さい時間に行うようにしてもよい。
【００５４】
取得モード入力部１２５は、後述するユーザインタフェースで設定された画像データの取得モードを入力する。
【００５５】
画像データ供給部１４０Ａは、取得モード入力部１２５に入力された取得モードに応じて携帯電話機１Ａにカラー画像データ全部を供給するか、輝度データと色差データとを分けて供給するかを判別し、それに基づいたデータを携帯電話機１Ａに供給する。輝度データと色差データと分けて供給するときには、上述したバイト情報に基づいて輝度データと色差データとに分ける。なお、輝度データおよび色差データのそれぞれのヘッダには、後から両者を関連付けて合成することができるように、識別情報が付される。
【００５６】
ユーザインタフェース供給部１５０は、携帯電話機１Ａがサーバ１００Ａにアクセスしたときに、画像データの取得モードを設定するユーザインタフェースを表示させるためのデータを供給する。また、輝度データを携帯電話機１Ａに供給するときには、色差データを引き続き要求するか否かを求めるユーザインタフェースを表示させるためのデータを供給する。
【００５７】
図７は、画像データの取得モードを設定するユーザインタフェースを示す説明図である。本実施例では、カラー画像データを取得する「カラー」モードと、輝度データと色差データとを段階的に取得可能な「輝度＋色」モードとが用意されている。このユーザインタフェースは、携帯電話機１Ａの液晶パネルＬＣＤに表示され、ユーザは、いずれかを選択することができる。なお、このユーザインタフェースは、予め携帯電話機１Ａが備えるようにしてもよい。
【００５８】
図８は、輝度データがサーバ１００Ａから供給されるときに、サーバ１００Ａから輝度データと一緒に供給され、携帯電話機１Ａの液晶パネルＬＣＤに表示されるユーザインタフェースを示す説明図である。携帯電話機１Ａの液晶パネルＬＣＤには、輝度データのみのモノクロ画像Ｐとユーザインタフェースとが表示される。このユーザインタフェースには、「色データ」と「終了」のメニューが用意されている。これによって、輝度データに引き続き色差データを取得するか、輝度データのみ取得して画像データのダウンロードを終了するかが選択可能である。
【００５９】
携帯電話機１Ａの制御ユニット１０（図６参照）は、取得部１１と、記憶部１２と、合成部１３と、表示部１４とを備えている。取得部１１は、サーバ１００Ａからカラー画像データ全体、あるいは、輝度データ、色差データを取得する。記憶部１２は、取得したデータを記憶する。合成部１３は、輝度データと色差データとをヘッダに付された識別情報に基づいて関連付けて合成し、１つの画像データにする。表示部１４は、液晶パネルＬＣＤに画像を表示させる。
【００６０】
図９は、サーバ１００Ａが行う画像データの出力処理を示すフローチャートである。なお、本実施例では、カラー画像データを扱う場合について示す。サーバ１００Ａは、携帯電話機１Ａから画像出力の要求を受信すると（ステップＳ２００）、画像データの取得モードを設定するユーザインタフェースのデータを携帯電話機１Ａに供給する（ステップＳ２１０）。すると、携帯電話機１Ａの液晶パネルＬＣＤにユーザインタフェースが表示される。ユーザは、このユーザインタフェースで画像データの取得モードを設定する。設定された取得モードは、サーバ１００Ａに送信され、入力される（ステップＳ２２０）。そして、入力された取得モードが「カラー」モードであるか否かを判別する（ステップＳ２３０）。「カラー」モードであれば、カラー画像データ全体を供給し（ステップＳ２４０）、画像データ出力処理を終了する。「カラー」モードでなければ、即ち、「輝度＋色」モードであれば、データのヘッダに記されたバイト情報に基づいてカラー画像データを輝度データと色差データとに分離し、後に色差データと合成することができるように識別情報を付して輝度データを供給する（ステップＳ２５０）。このとき、図８に示したユーザインタフェースを表示するためのデータも一緒に供給する。次に、ユーザインタフェースで選択された指示を入力する（ステップＳ２６０）。そして、「色データ」が選択されたか否かを判別する（ステップＳ２７０）。「色データ」が選択されていれば、輝度データと合成できるように識別情報を付した色差データを供給し（ステップＳ２７０）、画像データ出力処理を終了する。「色データ」が選択されていなければ、即ち、「終了」が選択されていれば、画像データの出力処理を終了する。
【００６１】
一方、携帯電話機１Ａは、ステップＳ２４０によりカラー画像全体を取得するときには、カラー画像を構成するＲＧＢ成分をカラー液晶パネルのＲＧＢ領域に供給する。また、ステップＳ２５０により輝度データを取得するときには、輝度Ｙ成分をカラー液晶パネルのＲＧＢ領域に共通に供給する。更に色差データの一例としてＣｂ，ＣｒデータをステップＳ２８０により取得するときには、合成部１３で上述した識別情報に基づいて、次式により、輝度データＹと色差データＣｂ，ＣｒとをＲＧＢデータへ合成し、合成後のＲＧＢデータをカラー液晶パネルのＲＧＢ領域に供給する。
【００６２】
【数２】

【００６３】
なお、上式（２）は、データのビット数が８（２５６階調）のときのＹＣｂＣｒデータからＲＧＢデータへの合成式であり、ＪＰＥＧ圧縮でよく用いられる。
【００６４】
このように第２実施例によれば、サーバ１００Ａにカラー画像データが用意されているときに、携帯電話機１Ａは、画像データの取得モード、即ち、ユーザの表示要求に応じて輝度データのみをサーバ１００Ａからダウンロードしてモノクロ画像を表示することができる。携帯電話機１Ａは、更に、サーバ１００Ａから色差データをダウンロードして、合成部１３で輝度データと色差データとを関連付けて合成することができるので、カラー画像を表示することもできる。
【００６５】
Ｄ．変形例：
以上、本発明のいくつかの実施の形態について説明したが、本発明はこのような実施の形態になんら限定されるものではなく、その要旨を逸脱しない範囲内において種々なる態様での実施が可能である。例えば、以下のような変形例が可能である。
【００６６】
Ｄ１．変形例１：
上記第１実施例では、画像出力装置としての携帯電話機の機種情報に応じてカラー画像データとモノクロ画像データとを切り換えて供給する画像データ供給装置を用いた場合について示したが、これに限られるものではない。本発明は、一般に、画像表示装置の機種情報に応じて画像データ供給装置から供給する画像データを切り換える画像表示システムに適用可能である。例えば、画像表示装置の機種情報に応じて画像データ供給装置が異なるサイズや異なる解像度の画像データを供給する画像表示システムに適用することもできる。
【００６７】
Ｄ２．変形例２：
上記第２実施例では、サーバ１００Ａがカラー画像データを輝度データと色差データとに分割して画像データの一部として段階的に供給する場合について示したが、これに限られるものではない。例えば、画像データの一部として、画像データのＲ成分、Ｇ成分、Ｂ成分を別々に供給するようにしてもよい。このときには、Ｇ成分を先に供給し、後からＲ成分とＢ成分を供給するようにすることが好ましい。先に示した式（１）から解かるように、Ｇ成分は他の成分に比べてより多くの輝度情報を含むからである。Ｇ成分を先に取得して表示することによって、閲覧者は画像の輝度情報の概略を得ることができる。
【００６８】
また、画像の右半分、左半分等、画像領域の一部の画像データを供給するようにしてもよい。画像データを間引いて小さいサイズの画像データを供給するようにしてもよい。また、動画データを供給する場合に、画像データを間引いてコマ送り画像を供給するようにしてもよい。画像表示装置は、カラー画像表示装置ではなく、モノクロ画像表示装置であってもよい。
【図面の簡単な説明】
【図１】第１実施例としての画像表示システムの構成を示す説明図である。
【図２】サーバ１００からダウンロードする画像データの切り換え用のインタフェースを示す説明図である。
【図３】携帯電話機１の液晶パネルＬＣＤに表示するユーザインタフェースを示す説明図である。
【図４】サーバ１００が行う画像データの出力処理を示すフローチャートである。
【図５】カラー液晶パネルの各セルの配列を示す説明図である。
【図６】第２実施例としての画像表示システムの構成を示す説明図である。
【図７】画像データ取得モードを設定するユーザインタフェースを示す説明図である。
【図８】サーバ１００Ａから輝度データと一緒に供給されるユーザインタフェースを示す説明図である。
【図９】サーバ１００Ａが行う画像データの出力処理を示すフローチャートである。
【符号の説明】
１，１Ａ…携帯電話機
１０…制御ユニット
１１…取得部
１２…記憶部
１３…合成部
１４…表示部
１５…操作ボタン
１００，１００Ａ…サーバ
１１０…画像データ入力部
１２０，１２０Ａ…画像データ記憶部
１２５…取得モード入力部
１３０…機種情報取得部
１３５…画像データ分割部
１４０，１４０Ａ…画像データ供給部
１５０…ユーザインタフェース供給部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to image display in response to a viewer's display request.
[0002]
[Prior art]
2. Description of the Related Art A technique for downloading image data uploaded to a server from an image input device such as a digital camera using the Internet or another network and displaying an image on an image display device has become widespread. When displaying downloaded image data on an image display device, generally, a viewer often requests high-quality image display. For this reason, a provider of image data may prepare high-resolution color image data having a large data capacity in a server. In recent years, liquid crystal display panels provided in mobile phones that can be connected to the Internet have been colored, and color image data is exchanged.
[0003]
[Problems to be solved by the invention]
By the way, when downloading image data from the server, communication time and communication fee are required. If the data capacity is large, the communication time becomes longer and the communication fee also becomes higher. Since image data of a high quality image has a large data capacity, a viewer may not always want to display a high quality image. For example, in order to reduce the communication time and communication charge, the user can display a color image on the image display device, and even if the image data prepared in the server is a color image, a monochrome image with a small data capacity In some cases, it is desirable to display a low-resolution image even when the image data is a high-resolution image. However, conventionally, image data corresponding to such a viewer's display request has not been provided.
[0004]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a technique for displaying an image according to a display request of a viewer on an image display device.
[0005]
[Means for solving the problems and their functions and effects]
In order to solve at least a part of the above-described problems, the present invention employs the following configuration.
The image data supply apparatus of the present invention is
An image data supply device that supplies image data to an image display device connected to a network via the network,
An image data storage unit for storing image data;
An acquisition mode input unit for inputting an acquisition mode for specifying a display mode on the image display device;
For a specific acquisition mode, an image data supply unit that supplies a part of the information of the image data to the image display device;
It is a summary to provide.
[0006]
Even if the image data provider prepares a color image in the image data supply device, the viewer can display the image display device in various display modes such as monochrome display or partial display of the image area. In order to do so, there is a case where it is desired to acquire only a part of information of the image data. “Partial information of image data” means that data obtained by extracting a part of image data or a part of data subjected to predetermined conversion by image processing may be used. ing. In the present invention, the acquisition mode for specifying the display mode of the image on the image display device by the viewer is set. The set acquisition mode is input to the image data supply device. The image data supply device supplies a part of the image data to the image display device when the input acquisition mode is a specific acquisition mode. By doing so, it is possible to display an image according to the display request of the viewer on the image display device.
[0007]
In the image data supply apparatus of the present invention,
The image data supply unit supplies a part of the image data to the image display device stepwise in response to a request from the image display device for the specific acquisition mode. Is preferred.
[0008]
By doing so, the viewer can request and acquire part of the image data step by step from the image data supply device. As a result, a more detailed image can be displayed on the image display device step by step in response to a display request.
[0009]
For example, in the image data supply device,
The image data is color image data,
The image data supply unit may supply the color image data to the image display device for each color component.
[0010]
“A part of color components of color image data” means, for example, R component, G component, B component of RGB color system, L * component, a * component, b of L * a * b * color system * A component, a Y component of a YCbCr color system, a Cb component, a Cr component, and the like. The image data supply device of the present invention supplies color image data to the image display device for each color component. By doing so, the viewer can request color image data for each color component and obtain it step by step. Then, a color image can be displayed on the image display device step by step.
[0011]
More specifically, the image data supply unit can separate the color image data into luminance data and color difference data and supply the separated data to the image display device.
[0012]
By doing so, the viewer can acquire luminance data and display a monochrome image, and if necessary, can display a color image by acquiring color difference data.
[0013]
In the image data supply apparatus of the present invention,
Further, a user interface supply unit that supplies data for displaying a user interface for selecting the acquisition mode to the image display device may be provided.
[0014]
The user interface supplied from the user interface supply unit is displayed on the image display device. For example, a button for setting an acquisition mode is displayed on the image display device. The viewer can set the acquisition mode of the image data according to the aspect that can be supplied by the image data supply device through the user interface displayed on the image display device.
[0015]
In the image data supply apparatus,
The user interface may be an interface for requesting the image data step by step.
[0016]
The user interface may be configured to supply the image data for requesting the image data step by step to the image display device at a time. May be supplied and displayed in stages. By doing so, the viewer can request image data step by step through the user interface supplied and displayed on the image display device.
[0017]
Although the invention of the image data supply apparatus has been described above, the present invention can also be configured as an invention of an image display apparatus.
That is, the first image display device of the present invention is
An image display device that displays image data acquired from an image data supply device via a network,
The image data supply device switches at least one of the size and resolution of the image data according to the model information of the image display device, and supplies the image data corresponding to the model information to the image display device Device to
The image display device means that the model information transmitted to the image data supply device is not true model information meaning the image display device but another image display device having a specification different from that of the image display device. The gist is to provide an operation unit for switching to model information.
[0018]
For example, when displaying an image on a liquid crystal panel of a mobile phone, a server as an image data supply device may change a file of image data supplied according to model information of the mobile phone as an image display device. In the present invention, the model information can be switched to other model information that is not true by the operation unit. Therefore, the image display apparatus of the present invention can acquire and display image data for different models from the image data supply apparatus, assuming that they are of different models.
[0019]
There are various modes for switching the image data to be supplied according to the model information of the image display device.
In the above image display device,
The image data supply device supplies color image data to the first model information corresponding to the color image display device, and monochrome image data to the second model information corresponding to the monochrome image display device. Supply device,
The image display device is a color image display device that transmits first model information;
The operation unit may be an operation unit for switching the first model information of the image display device to the second model information.
[0020]
In some cases, the image data supply device switches and supplies color image data and monochrome image data from the model information of the image display device. For example, the server supplies color image data if the model information of the accessed mobile phone is a model equipped with a color liquid crystal panel, and if the model information is a model equipped with a monochrome liquid crystal panel, the server receives monochrome image data. May be supplied. In the image display device of the present invention, the first model information corresponding to the color image display device can be switched to the second model information corresponding to the monochrome image display device by the operation unit. As a result, even if it is a color image display device, it is possible to request image data from the image data supply device as a monochrome image display device.
[0021]
In the above image display device,
The image display device can display color image data corresponding to the first model information and can display monochrome image data corresponding to the second model information.
[0022]
By doing so, the image display device sends the second model information corresponding to the monochrome image display device to the image data supply device, and when the monochrome image data is sent from the image data supply device, the sent monochrome image is sent. Data can be acquired and displayed.
[0023]
The second image display device of the present invention is
An image display device that displays image data acquired from an image data supply device via a network,
The image data supply device is a device capable of dividing and supplying image data into predetermined image data according to an acquisition mode for specifying a display mode on the image display device,
The gist of the present invention is to provide a user interface for selecting the acquisition mode.
[0024]
In the present invention, the image display device includes a user interface for selecting an acquisition mode for specifying a display mode in advance, and the acquisition mode set by the user interface is input to the image data supply device. Image data corresponding to the acquisition mode is supplied from the image data supply device. At this time, when the set acquisition mode is a specific acquisition mode, the image data is divided into predetermined image data and supplied. By doing so, it is possible to acquire and display image data corresponding to the display request of the viewer.
[0025]
The third image display device of the present invention is
An image display device that displays image data acquired from an image data supply device via a network,
An acquisition unit that acquires image data step by step;
A synthesizing unit that synthesizes the acquired pieces of image data in association with each other;
A display unit for displaying the synthesized image data;
It is a summary to provide.
[0026]
By doing so, it is possible to acquire part of the image data step by step, and combine and display them in association with each other. Here, “acquiring in stages” does not include an aspect in which the image data supply apparatus transmits in stages regardless of the user's intention, depending on the image format such as GIF interlace and the protocol. What is acquired step by step in response to a request from the user.
[0027]
In the above image display device,
The image display device is a color image display device,
The data acquired in stages can be data for each color component.
[0028]
By doing so, it is possible to acquire image data for each color component step by step, and combine and display them in each case. For example, R component, G component, and B component image data of the RGB color system can be acquired separately in stages, combined, and displayed.
[0029]
The image data acquired in stages may be luminance data and color difference data of color image data.
[0030]
By doing so, it is possible to display the color image by first obtaining and displaying the luminance data and then combining the obtained luminance data with the obtained color difference data.
[0031]
In the above image display device,
The image display device is a color image display device,
The display unit may be capable of displaying the image data acquired in stages before synthesis.
[0032]
By doing so, it is possible to display only a part of the image data without combining the image data acquired in stages.
[0033]
The present invention can be configured as an invention of an image data supply method and an image data request method in addition to the above-described configuration as an image data supply device and an image display device. Further, the present invention can be realized in various modes such as a computer program that realizes these, a recording medium that records the program, and a data signal that includes the program and is embodied in a carrier wave. In addition, in each aspect, it is possible to apply the various additional elements shown above.
[0034]
When the present invention is configured as a computer program or a recording medium on which the program is recorded, it may be configured as an entire program for driving an image data supply device and an image display device, or a portion that performs the functions of the present invention. It is good also as what comprises only. Recording media include flexible disks, CD-ROMs, magneto-optical disks, IC cards, ROM cartridges, punch cards, printed matter on which codes such as bar codes are printed, computer internal storage devices (memory such as RAM and ROM) ) And an external storage device can be used.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in the following order based on examples.
A. System configuration:
B. Request image data:
C. Second embodiment:
D. Variations:
[0036]
A. System configuration:
FIG. 1 is an explanatory diagram showing a configuration of an image display system as a first embodiment. A case will be exemplified in which the cellular phone 1 having a function of accessing the Internet INT is used as an image display device, and the server 100 connected to the Internet INT is used as an image data supply device. The mobile phone 1 accesses the Internet INT via wireless communication with the base station CTR, and downloads image data from the server 100 that is also connected to the Internet. The downloaded image data is processed by a control unit (not shown) in the mobile phone 1 and displayed on the liquid crystal panel LCD. The control unit is configured as a microcomputer including a CPU, a memory, and the like, and performs image processing and controls display by software. In this embodiment, the cellular phone 1 is a model that includes a color liquid crystal panel and can display a color image.
[0037]
FIG. 1 also shows the functional blocks of the server 100. The server 100 includes an image data input unit 110, an image data storage unit 120, a model information acquisition unit 130, and an image data supply unit 140. These functional blocks are built in the server 100 by software. In addition to these functional blocks, a block for performing image processing on the image data is also provided. In this embodiment, a case where all functional blocks are prepared in a single server 100 is illustrated, but distributed processing may be performed by a plurality of servers.
[0038]
In the image data input unit 110, image data acquired by a digital camera or scanner (not shown) or image data created and processed using an application program installed in a personal computer is stored on the Internet INT or a local area network (not shown). Is input through.
[0039]
The image data storage unit 120 stores two types of data for one image, color image data for displaying on the color liquid crystal panel and monochrome image data for displaying on the monochrome liquid crystal panel. These are stored in association with the model information of the mobile phone.
[0040]
The model information acquisition unit 130 acquires model information of the mobile phone 1 when the mobile phone 1 accesses the server 100. By acquiring this model information, the server 100 can specify the specifications of the mobile phone 1, that is, the type and size of the liquid crystal panel.
[0041]
The image data supply unit 140 determines whether to supply color image data or monochrome image data to the mobile phone 1 based on the model information acquired by the model information acquisition unit 130 and supplies the image data based on the color image data to the mobile phone. 1 is supplied. That is, if the mobile phone accessing the server 100 is a model equipped with a monochrome liquid crystal panel, monochrome image data is supplied, and if it is a model equipped with a color liquid crystal panel, color image data is supplied.
[0042]
B. Request image data:
2 and 3 are explanatory diagrams showing an interface for switching image data downloaded from the server 100. FIG. The mobile phone 1 includes an operation button 15 for switching between downloading color image data or monochrome image data (FIG. 2). By operating this operation button 15, the model information of the mobile phone 1 can be switched. The cellular phone 1 is a model equipped with a color liquid crystal panel, but when the operation button 15 is used to switch to a mode for downloading monochrome image data, for example, the model information of the cellular phone 1 is a model equipped with a monochrome liquid crystal panel. Switch to model information. This model information is transmitted to the server 100, and the server 100 determines that the accessed mobile phone 1 is a model having a monochrome liquid crystal panel. In this way, the cellular phone 1 having a color liquid crystal panel can download monochrome image data prepared for supply to a model having a monochrome liquid crystal panel.
[0043]
Switching between color image data and monochrome image data downloaded from the server 100 can be performed by providing the mobile phone 1 with a switching user interface. FIG. 3 is an explanatory diagram showing a user interface displayed on the liquid crystal panel LCD of the mobile phone 1. In this embodiment, a “color” mode for downloading color image data and a “monochrome” mode for downloading monochrome image data are prepared. A user interface for switching image data to be downloaded is displayed from the browser menu of the mobile phone 1, and the model information (color / monochrome) is switched by the user selecting and setting. When the “color” mode is selected, model information of a model equipped with a color liquid crystal panel is transmitted to the server 100 when image data is requested. When the “monochrome” mode is selected, model information of a model having a monochrome liquid crystal panel is transmitted to the server 100.
[0044]
FIG. 4 is a flowchart illustrating image data output processing performed by the server 100. The server 100 receives a request for image output from the mobile phone 1 (step S100). At that time, the model information of the mobile phone 1 is acquired (step S110). And it is discriminate | determined whether the acquired model information is the model information of the mobile telephone provided with the color liquid crystal panel (step S120). If the acquired model information is model information of a mobile phone equipped with a color liquid crystal panel, color image data is supplied (step S130). If it is not the model information of the mobile phone provided with the color liquid crystal panel, that is, if it is the model information of the mobile phone provided with the monochrome liquid crystal panel, monochrome image data is supplied (step S140).
[0045]
FIG. 5 is an explanatory diagram showing the arrangement of the cells of the color liquid crystal panel. One pixel is composed of one cell each of R, G, and B, and a region surrounded by a thick solid line indicates one pixel. When the “color” mode is selected by the user, the RGB color components of the color image data are supplied to the RGB area constituting one pixel of the color liquid crystal panel. On the other hand, when the “monochrome” mode is selected by the user, monochrome image data is supplied in common to the RGB area constituting one pixel of the color liquid crystal panel. By doing so, it is possible to display monochrome image data even on a color liquid crystal panel.
[0046]
Conventionally, in a mobile phone equipped with a color liquid crystal panel, model information fixed to the model is transmitted to the server when the server is accessed, and data for the model is supplied. According to the first embodiment, even if the mobile phone is a model provided with a color liquid crystal panel, the model information can be switched to model information that is not true by the operation button 15 or the user interface. Therefore, the image data to be downloaded can be switched while the processing performed by the server 100 is the same as the conventional one. That is, image data corresponding to a user's display request can be downloaded from the server and displayed.
[0047]
C. Second embodiment:
In the first embodiment, a plurality of files corresponding to the model information of the mobile phone are prepared for one image in the server 100, and the entire image data to be downloaded, that is, the download is switched by switching the model information of the mobile phone 1. The file to be switched was switched. The second embodiment shows a mode in which part of image data is downloaded and displayed in response to a user request.
[0048]
FIG. 6 is an explanatory diagram showing the configuration of the image display system as the second embodiment. In the figure, a functional block diagram of the server 100A and a functional block diagram related to image display in the control unit 10 of the mobile phone 1A are shown together.
[0049]
The server 100A includes an image data input unit 110, an image data storage unit 120A, an acquisition mode input unit 125, an image data division unit 135, an image data supply unit 140A, and a user interface supply unit 150. Server 100A is a server capable of supplying a part of image data in accordance with an acquisition mode for specifying a display mode of image data on liquid crystal panel LCD of mobile phone 1A. In this embodiment, the server 100A is a server capable of supplying color image data in stages by dividing the color image data into luminance data and color difference data.
[0050]
The image data storage unit 120A stores color image data input to the image data input unit 110. The color image data is divided into luminance data and color difference data by the image data dividing unit 135, and byte information indicating the capacity of each data is written in the header.
[0051]
For example, the following equation can be used for conversion from RGB data representing a color image to Y, Cb, Cr data representing luminance and color difference data.
[0052]
[Expression 1]

[0053]
The above formula (1) is a conversion formula from RGB data to YCbCr data when the number of data bits is 8 (256 gradations), and is often used in JPEG compression. The conversion from RGB data to YCbCr may be performed in advance in an image input device (not shown) before inputting data to the image data input unit 110, or after RGB data is once input to the image data input unit 110. An image conversion unit (not shown) may be performed at a time when the load on the server 100A is small.
[0054]
The acquisition mode input unit 125 inputs an acquisition mode of image data set by a user interface described later.
[0055]
The image data supply unit 140A determines whether to supply all color image data to the mobile phone 1A according to the acquisition mode input to the acquisition mode input unit 125, or to supply luminance data and color difference data separately, Data based on the data is supplied to the mobile phone 1A. When the luminance data and the color difference data are supplied separately, the luminance data and the color difference data are divided based on the byte information described above. Note that identification information is attached to each header of the luminance data and the color difference data so that they can be combined and combined later.
[0056]
The user interface supply unit 150 supplies data for displaying a user interface for setting an image data acquisition mode when the mobile phone 1A accesses the server 100A. When the luminance data is supplied to the mobile phone 1A, data for displaying a user interface for determining whether or not to continue to request color difference data is supplied.
[0057]
FIG. 7 is an explanatory diagram showing a user interface for setting an image data acquisition mode. In the present embodiment, a “color” mode for acquiring color image data and a “brightness + color” mode capable of acquiring luminance data and color difference data in stages are prepared. This user interface is displayed on the liquid crystal panel LCD of the mobile phone 1A, and the user can select one of them. The user interface may be provided in the mobile phone 1A in advance.
[0058]
FIG. 8 is an explanatory diagram showing a user interface that is supplied together with the luminance data from the server 100A and displayed on the liquid crystal panel LCD of the mobile phone 1A when the luminance data is supplied from the server 100A. On the liquid crystal panel LCD of the cellular phone 1A, a monochrome image P with only luminance data and a user interface are displayed. In this user interface, “color data” and “end” menus are prepared. Accordingly, it is possible to select whether to acquire the color difference data following the luminance data, or to acquire only the luminance data and end the download of the image data.
[0059]
The control unit 10 (see FIG. 6) of the mobile phone 1A includes an acquisition unit 11, a storage unit 12, a synthesis unit 13, and a display unit 14. The acquisition unit 11 acquires the entire color image data, luminance data, or color difference data from the server 100A. The storage unit 12 stores the acquired data. The synthesizing unit 13 synthesizes the luminance data and the color difference data by associating them based on the identification information attached to the header to form one image data. The display unit 14 displays an image on the liquid crystal panel LCD.
[0060]
FIG. 9 is a flowchart showing image data output processing performed by the server 100A. In this embodiment, a case where color image data is handled will be described. Upon receiving an image output request from the mobile phone 1A (step S200), the server 100A supplies user interface data for setting an image data acquisition mode to the mobile phone 1A (step S210). Then, the user interface is displayed on the liquid crystal panel LCD of the mobile phone 1A. The user sets the image data acquisition mode using this user interface. The set acquisition mode is transmitted to the server 100A and input (step S220). Then, it is determined whether or not the input acquisition mode is the “color” mode (step S230). If it is the “color” mode, the entire color image data is supplied (step S240), and the image data output process is terminated. If it is not the “color” mode, that is, if it is the “brightness + color” mode, the color image data is separated into luminance data and color difference data based on the byte information written in the header of the data. Luminance data is supplied with identification information so that it can be combined (step S250). At this time, data for displaying the user interface shown in FIG. 8 is also supplied. Next, the instruction selected on the user interface is input (step S260). Then, it is determined whether or not “color data” has been selected (step S270). If “color data” is selected, color difference data with identification information so that it can be combined with luminance data is supplied (step S270), and the image data output process is terminated. If “color data” has not been selected, that is, if “end” has been selected, the image data output processing is terminated.
[0061]
On the other hand, when acquiring the entire color image in step S240, the cellular phone 1A supplies the RGB components constituting the color image to the RGB area of the color liquid crystal panel. Further, when the luminance data is acquired in step S250, the luminance Y component is commonly supplied to the RGB area of the color liquid crystal panel. Further, when Cb and Cr data are acquired as an example of color difference data in step S280, the luminance data Y and the color difference data Cb and Cr are combined into RGB data by the following equation based on the identification information described above by the combining unit 13. Then, the combined RGB data is supplied to the RGB area of the color liquid crystal panel.
[0062]
[Expression 2]

[0063]
The above formula (2) is a synthesis formula from YCbCr data to RGB data when the number of data bits is 8 (256 gradations), and is often used in JPEG compression.
[0064]
As described above, according to the second embodiment, when color image data is prepared in the server 100A, the mobile phone 1A can obtain only the brightness data in accordance with the image data acquisition mode, that is, the display request of the user. A monochrome image can be displayed by downloading from 100A. Furthermore, since the cellular phone 1A can download the color difference data from the server 100A and synthesize the luminance data and the color difference data in association with each other by the synthesis unit 13, the color image can also be displayed.
[0065]
D. Variations:
As mentioned above, although several embodiment of this invention was described, this invention is not limited to such embodiment at all, and implementation in various aspects is possible within the range which does not deviate from the summary. It is. For example, the following modifications are possible.
[0066]
D1. Modification 1:
In the first embodiment, the case of using the image data supply device that switches between color image data and monochrome image data according to the model information of the cellular phone as the image output device has been described. However, the present invention is not limited to this. It is not a thing. The present invention is generally applicable to an image display system that switches image data supplied from an image data supply device in accordance with model information of the image display device. For example, the present invention can be applied to an image display system in which an image data supply device supplies image data of different sizes and resolutions according to the model information of the image display device.
[0067]
D2. Modification 2:
In the second embodiment, the case where the server 100A divides the color image data into luminance data and color difference data and supplies them in stages as part of the image data is shown, but the present invention is not limited to this. For example, the R component, G component, and B component of the image data may be separately supplied as part of the image data. At this time, it is preferable that the G component is supplied first and the R component and B component are supplied later. This is because the G component includes more luminance information than the other components, as can be understood from the equation (1) shown above. By acquiring and displaying the G component first, the viewer can obtain an outline of the luminance information of the image.
[0068]
Also, a part of the image data such as the right half and the left half of the image may be supplied. Image data of a small size may be supplied by thinning out the image data. Further, when moving image data is supplied, the frame advance image may be supplied by thinning out the image data. The image display device may be a monochrome image display device instead of a color image display device.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a configuration of an image display system as a first embodiment.
FIG. 2 is an explanatory diagram showing an interface for switching image data downloaded from the server 100;
FIG. 3 is an explanatory diagram showing a user interface displayed on a liquid crystal panel LCD of the mobile phone 1;
FIG. 4 is a flowchart illustrating image data output processing performed by the server.
FIG. 5 is an explanatory diagram showing an arrangement of cells of a color liquid crystal panel.
FIG. 6 is an explanatory diagram showing a configuration of an image display system as a second embodiment.
FIG. 7 is an explanatory diagram showing a user interface for setting an image data acquisition mode.
FIG. 8 is an explanatory diagram showing a user interface supplied together with luminance data from the server 100A.
FIG. 9 is a flowchart illustrating image data output processing performed by the server 100A.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,1A ... Cellular phone 10 ... Control unit 11 ... Acquisition part 12 ... Storage part 13 ... Composition part 14 ... Display part 15 ... Operation button 100, 100A ... Server 110 ... Image data input part 120, 120A ... Image data storage part 125 ... acquisition mode input unit 130 ... model information acquisition unit 135 ... image data division unit 140, 140A ... image data supply unit 150 ... user interface supply unit

Claims (4)

An image display device that displays image data acquired from an image data supply device via a network,
The image data supply device switches at least one of the size and resolution of the image data according to the model information of the image display device, and supplies the image data corresponding to the model information to the image display device Device to
The image display device means that the model information transmitted to the image data supply device is not true model information meaning the image display device but another image display device having a specification different from that of the image display device. Provide an operation unit to switch to model information,
Image display device. Connected to the network and switches at least one of the size and resolution of the image data according to the model information acquired from the image display device, and supplies the image data corresponding to the model information to the image display device An image data requesting method for requesting image data from the image display device to the image data supply device,
(A) switching the model information of the image display device to model information meaning another image display device having a specification different from that of the image display device instead of the true model information meaning the image display device;
(B) requesting the image data by transmitting the switched model information to the image data supply device;
An image data request method comprising:   An image display system configured by connecting an image display device and an image data supply device via a network,
  The image display device includes:
  The model information transmitted to the image data supply device is not true model information meaning the image display device, but is switched to model information meaning another image display device having a different specification from the image display device. An operation unit;
  A transmission unit for transmitting the model information and image data request to the image data supply device;
  With
  The image data supply device includes:
  A receiver that receives the request for the model information and image data transmitted from the image display device;
  In accordance with the model information, the image data supply unit supplies at least one of the size and resolution of the image data and supplies image data corresponding to the model information to the image display device;
  An image display system comprising:   A method for controlling an image display system configured by connecting an image display device and an image data supply device via a network,
  The model information transmitted to the image data supply device by the image display device is not true model information meaning the image display device, but means another image display device having a different specification from the image display device. Switching to model information;
  The image display device transmitting a request for the model information and image data to the image data supply device;
  The image data supply device receiving the model information and image data request transmitted from the image display device;
  Switching at least one of the size and resolution of image data according to the model information, and supplying image data corresponding to the model information to the image display device;
  An image display system control method comprising:

Images