JPH03189692A

JPH03189692A - Image display device

Info

Publication number: JPH03189692A
Application number: JP1330832A
Authority: JP
Inventors: Soichi Yamazaki; 宗一山崎
Original assignee: NEC Corp
Current assignee: NEC Corp
Priority date: 1989-12-19
Filing date: 1989-12-19
Publication date: 1991-08-19

Abstract

PURPOSE:To accomplish easy-to-view display even when an image has high brightness or has a complicated shape by storing content written in a graphic memory into a mask memory after enlarging the line width and masking the output of an image memory with the output of the mask memory. CONSTITUTION:A character and graphic write control unit 1 performs the control of writing the output data 2 into the graphic memory 3 and the processing of writing the content written in the memory 3 into the mask memory 5 after shifting or performing work such as the enlargement of the line width. A mask processing unit 10 performs the processing of masking the data 9 being the output of the image memory 8 with the data 6 being the output of the memory 5. The output data 4 of the memory 3 and the output 11 of the processing unit 10 are converted into a video signal 13 by a video signal converter 12 and outputted. Supposing that character data (a) is stored in the memory 3, mask data (b) is stored in the memory 5, and image data (c) is stored in the memory 8 with such constitution, the outputted signal 13 becomes display (d) which is framed character or graphic, so that the easy-to-view display is accomplished even when the image has high brightness or has a complicated shape.

Description

【発明の詳細な説明】〔産業上の利用分野〕本発明は画像表示装置に関し、特に多階調画像と文字及
び図形とを同一画面上に重ね合せて表示する画像表示装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device, and particularly to an image display device that displays multi-gradation images, characters, and graphics in a superimposed manner on the same screen.

〔従来の技術〕[Conventional technology]

従来、この種の画像表示装置は、多階調画像に単純に文
字及び図形を重ねるか、多階調画像の値が所定の値以上
の部分に重なる文字及び図形を白黒反転するか、文字及
び図形の輝度を多階調画像の最大輝度より高くする様な
表示を行っていた。Conventionally, this type of image display device has either simply superimposed characters and figures on a multi-tone image, inverted the black and white of the characters and figures that overlap with the part of the multi-tone image where the value is greater than a predetermined value, or The brightness of the figure was displayed higher than the maximum brightness of the multi-tone image.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の画像表示装置は、多階調画像に単純に文
字及び図形を重ねるか、多階調画像の値が所定の値以上
の部分に重なる文字及び図形を白黒反転するか、文字及
び図形の輝度を多階調画像の最大輝度より高くする様な
表示を行っているので、多階調画像の輝度が高いと文字
及び図形との輝度差が少なくなったり、多階調画像の形
状が複雑だと文字及び図形の輝度が複雑に変化したりし
て非常に見にくいという欠点がある。The conventional image display device described above either simply superimposes characters and figures on a multi-tone image, inverts the black and white of characters and figures that overlap with the portion of the multi-tone image where the value is greater than a predetermined value, or displays the characters and figures. Since the display is performed in such a way that the brightness of the image is higher than the maximum brightness of the multi-tone image, if the brightness of the multi-tone image is high, the brightness difference between the characters and figures will be small, and the shape of the multi-tone image will be If it is complicated, the brightness of characters and figures may change in a complicated manner, making it difficult to see.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の画像表示装置は、文字及び図形データを格納す
るグラフィックメモリと、多階調画像データを格納する
画像メモリと、前記画像メモリの出力をグラフィックメ
モリへ格納すると共にマスクするマスクデータを格納す
るマスクメモリと、前記グラフィックメモリへの書込内
容の加工を行って前記マスクメモリに制御を行う文字・
図形書込制御手段と、前記マスクメモリの出力で前記画
像メモリの出力をマスクする手段とを備えて構成される
。The image display device of the present invention includes a graphic memory that stores character and graphic data, an image memory that stores multi-tone image data, and mask data that stores the output of the image memory in the graphic memory and masks it. A mask memory and a character/character that processes the contents written to the graphic memory and controls the mask memory.
The image processing apparatus includes a graphic writing control means and means for masking the output of the image memory with the output of the mask memory.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明の一実施例の構成を示すブロック図であ
る。第１図において、１は文字・図形書込制御器、３は
グラフィックメモリ、５はマスクメモリ、８は画像メモ
リ、１０はマスク処理器、１２はビデオ信号変換器であ
る０文字・図形書込制御器１では文字・図形書込制御器
出力データ２をグラフィックメモリ３に書込で制御と、
グラフィックメモリに書込む内容をシフト又は線幅拡大
するなどの加工を行ってマスクメモリ５に書込む処理と
を行う。マスク処理器１０では画像メモリ８の出力であ
る画像メモリ出力データ９を、マスクメモリ５の出力で
あるマスクメモリ出力データ６でマスクする処理を行う
、グラフィックメモリ出力データ４とマスク処理品出力
１１とはビデオ信号変換器１２でビデオ信号１３に変換
されて出力される。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In FIG. 1, 1 is a character/graphic writing controller, 3 is a graphic memory, 5 is a mask memory, 8 is an image memory, 10 is a mask processor, and 12 is a video signal converter. The controller 1 controls by writing the character/figure writing controller output data 2 into the graphic memory 3.
Processing such as shifting or expanding the line width is performed on the content to be written to the graphic memory, and the process is then performed to write the content to the mask memory 5. The mask processor 10 performs a process of masking the image memory output data 9, which is the output of the image memory 8, with the mask memory output data 6, which is the output of the mask memory 5, and outputs graphic memory output data 4 and masked product output 11. is converted into a video signal 13 by a video signal converter 12 and output.

以上の構成において、いま、第２図（ａ）に示す文字デ
ータをグラフィックメモリ３に格納し、第２図（ｂ）に
示すマスクデータをマスクメモリ５に格納し、第２図（
ｃ）に示す画像データを画像メモリ８に格納したとする
と、第２図（ｄ）に示す表示を行うビデオ信号１３が出
力される。In the above configuration, the character data shown in FIG. 2(a) is now stored in the graphic memory 3, the mask data shown in FIG. 2(b) is stored in the mask memory 5, and the character data shown in FIG.
If the image data shown in c) is stored in the image memory 8, a video signal 13 for displaying as shown in FIG. 2(d) is output.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、グラフィックメモリへの
書込み内容をシフト又は線幅を拡大してマスクメモリに
格納し、そのマスクメモリの出力で画像メモリの出力を
マスクすることにより、文字又は図形の周囲の画像がマ
スクされ、文字又は図形がふち取りされた表示となるた
め、画像が高輝度であっても、複雑な形状であっても見
やすい表示ができるという効果がある。As explained above, the present invention shifts or expands the line width of the content written to the graphic memory and stores it in the mask memory, and masks the output of the image memory with the output of the mask memory. Since the surrounding image is masked and the characters or figures are displayed with edges, there is an effect that even if the image is of high brightness or has a complex shape, it can be displayed in an easy-to-read manner.

デオ信号。Deo signal.

Claims

【特許請求の範囲】１、文字及び図形データを格納するグラフィックメモリ
と、多階調画像データを格納する画像メモリと、前記画
像メモリの出力をグラフィックメモリへ格納すると共に
マスクするマスクデータを格納するマスクメモリと、前
記グラフィックメモリへの書込内容の加工を行って前記
マスクメモリに制御を行う文字・図形書込制御手段と、
前記マスクメモリの出力で前記画像メモリの出力をマス
クする手段とを備えて成ることを特徴とする画像表示装
置。２、前記加工が、前記グラフィックメモリへの書込内容
をシフト１として成ることを特徴とする請求項１に示す
画像表示装置。３、前記加工が、前記グラフィックメモリへの書込内容
の線幅を拡大して成ることを特徴とする請求項１に示す
画像表示装置。[Claims] 1. A graphic memory for storing character and graphic data, an image memory for storing multi-tone image data, and mask data for storing the output of the image memory in the graphic memory and masking it. a mask memory; a character/figure write control means for controlling the mask memory by processing the contents written to the graphic memory;
An image display device comprising: means for masking the output of the image memory with the output of the mask memory. 2. The image display device according to claim 1, wherein the processing is performed by shifting 1 the content written to the graphic memory. 3. The image display device according to claim 1, wherein the processing is performed by enlarging the line width of the content written to the graphic memory.