JPH0772236A - Display apparatus - Google Patents

Abstract

PURPOSE:To display a brightness level on a monitor without lowering the reliability of the video screen display of a radar or a sonar by installing a brightness-level detection part which detects the brightness level of extracted image data. CONSTITUTION:Graphic data and image data from frame memories 3, 4 are displayed on a monitor 7 via a memory 5 and a D/A converter 6 together with cursor symbol data from a cursor generator 2. Then, an operator instructs a brightness level display by designating a cursor position by a keyboard or the like. Thereby, a detection circuit 8 detects the designated cursor position, and it outputs a write signal to a data register 9. The register 9 stores only data on the designated cursor position out of the image data from the memory 4. A brightness-level detection part 10 takes out brightness data from the image data in the register 9, and it outputs the image data to a CPU 1. The CPU 1 image-composes the data, it writes the data into the memory 3, and it displays the data on the monitor 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying a video signal obtained from a radar or a sonar on a monitor together with graphic data.

[0002]

2. Description of the Related Art A display device has been put into practical use, which processes a radar video signal or the like into a number of forms according to the operator's selection and displays it on a screen.

FIG. 2 is a block diagram showing an example of a conventional display device. In the figure, the CPU 101 generates cursor information and graphic data corresponding to an operator's instruction. The cursor generator 102 generates cursor symbol data based on the cursor information, and the graphic data is stored in the graphic data frame memory 103. The video frame memory 104 stores image data obtained by digitally converting a video signal obtained by a radar or a sonar.

The look-up table memory 105 inputs cursor symbol data, graphic data, and image data from the video frame memory 104 and generates a color signal for monitor display.
The signal is converted into an analog signal by the / A converter 106 and displayed on the screen by the monitor 107. The screen displayed by the monitor 107 is, for example, a screen in which a radar video is mixed with graphic data such as terrain and symbol display, and further cursor display is performed.

[0005]

Such a monitor 10 is provided.
On the display screen of No. 7, the operator may visually compare the brightness of several bright spots to read necessary information. However, in the conventional display device, since the level of brightness is visually determined, the determination may vary.

In the conventional display device, if the brightness level at the position designated by the operator is to be displayed on the monitor screen, the video signal is written in the video frame memory 104 and the look-up table memory 1 is used.
It is necessary to stop the read operation to 05 and read the pixel data for the brightness level detection. For this,
There is a problem that the temporal continuity of the video signal is impaired, the information becomes temporally unstable, and the reliability of the screen display is lowered.

An object of the present invention is to provide a display device capable of displaying a brightness level on a monitor without lowering the reliability of screen display of radar video or sonar video.

[0008]

A display device according to the present invention is for displaying a video signal obtained from a radar or a sonar on a screen together with graphic data on a monitor.
An image memory capable of storing the video signal as digital image data, and data for extracting image data corresponding to a designated cursor position from the image data read out from the image memory for the monitor display. Extraction means, brightness level detection means for detecting the brightness level of the image data extracted by the data extraction means, and graphic data generation for inserting brightness data for displaying the detected brightness level on the screen into the graphic data. And means.

[0009]

The data extracting means extracts the image data corresponding to the designated cursor position from the image data read out from the image memory for monitor display. Luminance level detection is performed using the extracted data, and the luminance level is displayed graphically. At that time, the image data read from the video image memory is displayed on the monitor as usual.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a display device according to the present invention. In the figure, a CPU 1 includes necessary ROM and RAM, and generates cursor information (cursor position, cursor display form, etc.) and graphic data (symbols, numerical values, predetermined figures, etc.) corresponding to operator's instructions. At the same time, the operation of the entire circuit that constitutes this embodiment is controlled.

The cursor generator 2 generates cursor symbol data according to the cursor information from the CPU 1. The graphic data frame memory 3 is a CPU
The graphic data generated by 1 is stored for one frame (or one field), and the video frame memory 4 stores one frame (or one field) of image data obtained by digitally converting a video signal obtained by a radar or a sonar. Min) Store.

Color information for color display is stored in the lookup table memory 5, and cursor symbol data from the cursor generator 2, graphic data from the graphic data frame memory 3, and video data from the video frame memory 4 are stored. Image data is input to generate a color signal in a state where the respective data are combined. At that time, the frame memory 3 for graphic data
And the video frame memory 4 are read in synchronization with each other, and each read data is serially input to the look-up table memory 5.

The data output from the look-up table memory 5 is analog-converted by the D / A converter 6 and input to the monitor 7 as an analog video signal to be displayed on the screen.

The cursor symbol data output from the cursor generator 2 and the image data read from the video frame memory 4 are input to the data extraction unit and the image data at the cursor position designated is extracted.

The data extraction unit comprises a cursor position detection circuit 8 for inputting cursor symbol data and a data register 9 for inputting read image data. The cursor position detection circuit 8 outputs a position detection signal corresponding to the position of the cursor to the data register 9 as a write signal when the operator specifies the cursor position and gives an instruction to detect the brightness level. That is, the data register 9
Of the image data sequentially read from the video frame memory 4, only pixel data according to the position detection timing of the cursor position detection circuit 8 is fetched and output to the brightness level detection unit 10.

Level classification is preset in the brightness level detecting section 10, and the brightness data of the pixel data stored in the data register 9 is input to determine the brightness level. The brightness level at the cursor position thus obtained is C
The graphic data including the data for displaying the brightness level is output to the PU 1 and is generated and stored in the graphic data frame memory 3. The brightness level detection unit 10 can be configured as an independent circuit, or can be incorporated in the CPU 1 as software.

Next, the specific operation of this embodiment having such a configuration will be described.

The graphic data sequentially read from the graphic data frame memory 3 and the image data sequentially read from the video frame memory 4 together with the cursor symbol data sequentially output from the cursor generator 2, look-up table memories 5 and D.
It is assumed that the screen is displayed on the monitor 7 via the / A converter 6.

Here, the operator designates the cursor position by an input device (not shown) such as a keyboard and gives an instruction to display the brightness level. As a result, the cursor position detection circuit 8 inputs the cursor symbol data from the cursor generator 2 to detect the designated cursor position, and outputs a write signal to the data register 9 at the timing of the designated position. Therefore, the data register 9 selects the image data read from the video frame memory 4 from among the image data.
Only the image data at the specified cursor position is stored. At that time, the image data read out from the video frame memory 4 is normally sent to the monitor 7 together with the graphic data.
, And the data extractor has no effect on the radar or sonar video image.

The brightness level detector 10 extracts brightness data from the image data taken in the data register 9, detects the brightness level at the designated cursor position, and outputs it to the CPU 1. CPU1 with input brightness level
Composes the generated graphic data with the data for displaying the brightness level on the screen by a symbol or a numerical value, and writes the data into the graphic data frame memory 3.

In this way, the brightness level at the designated cursor position can be displayed on the monitor 7 without affecting the video image of the radar or sonar.

If the same function as the brightness level detecting section 10 is realized by software, only the data extracting section needs to be provided as hardware, and the increase in circuit scale can be suppressed.

[0024]

As described in detail above, the display device according to the present invention extracts the image data corresponding to the designated cursor position from the image data read out from the video image memory for monitor display, and Is used to detect the brightness level and display it graphically. Therefore, the image data read out from the video image memory is displayed on the monitor as usual and is not affected by the brightness level detection at all. Therefore, the video display of the radar or sonar becomes time accurate information, and an objective brightness level display can be obtained without impairing the reliability of the display.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a display device according to the present invention.

FIG. 2 is a block diagram showing an example of a conventional display device.

[Explanation of symbols]

 1 CPU 2 cursor generator 3 frame memory for graphics 4 frame memory for video 5 look-up table memory 6 D / A converter 7 monitor 8 cursor position detection circuit 9 data register 10 brightness level detection unit

Claims (4)

[Claims] 1. A display device for displaying a video signal obtained from a radar or a sonar on a monitor together with graphic data on a screen, and an image memory capable of storing the video signal as at least one frame or one field as digital image data. A data extraction unit that extracts image data corresponding to a designated cursor position from the image data read out from the image memory for display on the monitor; and the image data extracted by the data extraction unit. A display device comprising: a brightness level detecting means for detecting a brightness level; and a graphic data generating means for inserting brightness data for displaying the detected brightness level on a screen into the graphic data. 2. The cursor position detection circuit, wherein the data extraction unit specifies the designated cursor position and outputs a position detection signal at a timing corresponding to the cursor position in the read timing from the image memory, The display device according to claim 1, further comprising: a data memory that stores image data read from the image memory according to the position detection signal. 3. A display device for displaying a video signal obtained from a radar or a sonar on a monitor together with graphic data on a screen, wherein the video signal can be stored as digital image data in at least one frame or one field. A memory and at least one frame or one of the graphic data
A graphic image memory that can be stored in a field, a cursor symbol data generation unit that generates cursor symbol data for displaying a cursor on the monitor, the cursor symbol data is input, and the monitor image display unit displays the monitor image from the video image memory. Data extracting means for extracting the image data corresponding to the designated cursor position among the image data read for that purpose, and a brightness level detecting means for detecting the brightness level of the image data extracted by the data extracting means, 2. A display device comprising: graphic data generating means for inserting the brightness data for displaying the detected brightness level on the screen into the graphic data and outputting the graphic data to the graphic image memory. 4. The cursor position detection circuit, wherein the data extraction means specifies the designated cursor position and outputs a position detection signal at a timing corresponding to the cursor position in the read timing from the video image memory, The display device according to claim 3, further comprising: a data memory that stores image data read from the video image memory in accordance with a position detection signal.