JPS638978A - Image controller - Google Patents

Abstract

PURPOSE:To shift a cursor without rewriting can image stored in a buffer memory when the cursor is shifted and to execute quickly the display updating accompanying the shift of the cursor by synthesizing and displaying image information and a cursor image. CONSTITUTION:When the information of a cursor is inputted to a keyboard 1, a coordinate position signal generating circuit 21 outputs position information S6 of the cursor based upon a keyboard signal S1 outputted from the keyboard 1. On the other hand, a cursor shape storing memory 23 outputs shape information S7 concerning the shape of the cursor. When a cursor image generating circuit 22 outputs a displaying image S8 of the cursor based upon the position information S6 outputted from the coordinate position signal generating circuit 21 and the shape information S7 outputted from the cursor shape storing memory 23, a synthesizing circuit 31 synthesizes image information S9 outputted from a frame buffer circuit 31 and the displaying image S8 of the cursor outputted from the cursor image generating circuit 22, generates a displaying signal S5 and displays it at a displaying device 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image M valve device that can synthesize an input image and a cursor image and display the composite on a display device.

[Prior Art] Generally, when displaying an image on a display device, image information is temporarily stored in two buffer memories, and the image information is alternately input and output repeatedly to display the image on the display device. things are being done.

FIG. 2 is an output diagram of a conventional image control device of this type. In the figure, 1 is a keyboard for inputting information regarding cursor display, and 2 is a cursor signal based on keyboard information S1 regarding the cursor output from the keyboard 1. S
2, a cursor signal generation circuit 3 generates screen information MIS 4 for one screen from an image signal S3 outputted from, for example, a processing device (not shown) and a cursor signal S2 from the cursor signal generation circuit 2, which will be described later. 7 a frame buffer circuit for expanding into the frame buffer circuit 4; 4 a frame buffer circuit consisting of two buffer memories 41 and 42 for temporarily storing screen information S4 output from the expansion circuit 3;
is the display signal S5 output from the frame buffer circuit 4
This is a display device that displays images based on

Next, the operation will be explained.

When information regarding cursor display is input to keyboard 1, keyboard information S1 is output from keyboard 1,
The cursor signal generation circuit 2 generates a cursor signal S2 based on the keyboard information S1 regarding the cursor.

On the other hand, the expansion circuit 3 receives an image signal S3 outputted from, for example, a central processing unit (not shown) and a cursor signal generation circuit 2.
Screen information S4 for one screen of the display image including the cursor display is generated from the cursor signal S2 from the cursor signal S2 from the cursor signal S2, and is output to the frame buffer circuit 4 consisting of two buffer 7 memories 41 and 42.

Here, the frame buffer circuit 4 temporarily stores the screen information S4, and when one buffer memory 41 stores the screen information S4 from the expansion circuit 3, the display signal S5 is sent from the other buffer memory 42 to the display device. The image information is alternately input and output as shown in step 5.

All of this processing is done by a program in the central processing unit, so that if, for example, the position of the cursor changes, the contents of the frame buffer circuit 4 are updated again by the program.

This frame buffer circuit 4 is of a so-called bitmap type in which one pixel of the image displayed on the display device 5 corresponds to one bit of storage capacity, and as shown in FIG. while scanning the screen information S4 from the expansion circuit 3,
Further, one display signal S5 is output to the display device 5 while scanning the storage area 42a of the buffer memory 42.

[Problems to be Solved by the Invention] Since the conventional image control device outputs as described above, for example, when the image signal S3 is not changed, an image in which only the position of the cursor is changed is displayed on the display device 5. Even if you want to display the cursor information on the keyboard 1, the cursor information input from the keyboard 1 is input to the expansion circuit 3, and after the cursor position has been changed by the expansion circuit 3, the information for one screen is stored in the buffer memory 41. I had to rememorize it at 42.

Moreover, since such processing is performed by a program, it not only takes a very long time, but also requires time to change the backup memory, and the central processing unit 1 that controls the display
etc., the burden has increased.

This invention was made in order to solve the above-mentioned problems.If the cursor is simply moved, there is no need to rewrite the image stored in the backup memory, and therefore the display on the display device is updated as the cursor is moved. The purpose is to speed up the process and reduce the burden on the central processing unit.

[Means for Solving the Problems] Therefore, the present invention provides a coordinate position signal generation circuit that outputs cursor position information S6 to be displayed on the display wave S25 based on cursor information input from the keyboard l. 2
1, a cursor shape memory memory 23 that stores the shape of the cursor in advance, device information S6 output from the coordinate position signal generation circuit 22, and shape information S7 output from the cursor shape memory 23. Cursor image generation circuit 22 that outputs the cursor display image S8
and image information S output from the frame buffer circuit 4
9 and a cursor display image S8 outputted from the cursor image generation circuit 22, and a synthesis circuit 31 that synthesizes the image S8 and displays the synthesized image on a display device.

[Function] When cursor information is input to the keyboard 1, based on the keyboard signal S1 output from the keyboard 1,
The coordinate position signal generation circuit 21 outputs cursor position information S6.

On the other hand, the cursor shape memory memory 23 outputs shape information S7 regarding the shape of the cursor, which is stored in advance in the cursor shape memory memory 23.

Here, when the cursor image generation circuit 22 outputs a cursor display image S8 based on the device information S6 outputted from the coordinate position signal generation circuit 21 and the shape information S7 outputted from the cursor shape memory memory 23, The circuit 31 synthesizes the image information S9 outputted from the frame buffer circuit 31 and the cursor display image S8 outputted from the cursor image generation circuit 22 to generate a display signal S5 and outputs it to the first display device 5.

The display device 5 displays the composite image according to the display signal S5.

[Embodiment] An embodiment of the present invention will be described below based on one drawing.

FIG. 1 is an output diagram showing an embodiment of the present invention. In the diagram, 21 is a coordinate position at which cursor position information S6 to be displayed on a display device is output based on a keyboard signal S1 regarding a cursor output from a keyboard. a signal generation circuit; 23, a cursor shape memory memory that stores the shape of the cursor in advance; 22, the coordinate position signal generation circuit 21;
31 is image information output from the frame buffer circuit 4; This is a synthesis circuit that synthesizes S9 and the cursor display image S8 outputted from the cursor image generation circuit 22 and outputs a display signal S5 to be displayed on the display device 5. Note that output elements that are the same as those in the prior art or corresponding output elements are given the same reference numerals or corresponding reference numerals, and explanations thereof will be omitted.

Next, the operation will be explained.

When you enter cursor information on the keyboard l.

Based on the keyboard signal S1 output from the keyboard 1, the coordinate position signal generation circuit 21 operates.

Position information S6 regarding the cursor, such as the XY coordinates when viewing the display device 5 in terms of XY coordinates, indicating where the cursor should be displayed on the display surface of the display device 5, is output.

Further, the cursor shape memory memory 23 outputs shape information S7 regarding the shape of the cursor stored in advance in the cursor shape memory memory 23.

Here, the cursor image generation circuit 22 outputs a cursor display image (tS8) based on the device information S6 output from the coordinate position signal generation circuit 21 and the shape information S7 output from the cursor shape memory memory 23.

On the other hand, an image signal S3 outputted from, for example, a central processing unit (not shown) is alternately stored in a frame buffer circuit 4 consisting of two buffer memories 41 and 42, and this frame buffer circuit 4 is alternately stored in a synthesis circuit 31. Image information S9 is output. .

Therefore, the 1 synthesis circuit 31 combines the image information S9 output from the frame buffer circuit 4 with the cursor image generation circuit 22.
The display signal S5 is synthesized with the display image S8 of the cursor output from the cursor, and is output to the display device 5.

This synthesis is performed, for example, when the image information S9 output from the frame buffer circuit 4 is being scanned.

Device information S6 output from the coordinate position signal generation circuit 21
When the coordinate position represented by is reached, the image information S9 is switched to the cursor display image S8 output from the cursor image generation circuit 22.

Here, the display device 5 displays the composite image according to the display signal S5.

Note that the frame buffer circuit 4 does not necessarily output data using two buffer memories 41 and 42, and may use two or one buffer memory. In that case, the time (speed) required for signal input/output processing There is no change in the function of the present invention.

[Effects of the Invention] As explained above, the present invention includes a coordinate position signal generation circuit that outputs cursor position information to be displayed on a display device based on cursor information input from a keyboard, and a coordinate position signal generation circuit that outputs cursor position information to be displayed on a display device based on cursor information input from a keyboard, and a cursor image generation circuit that outputs a display image of the cursor based on a stored cursor shape memory, position information output from the coordinate position signal generation circuit, and shape information output from the cursor shape memory; Since it is equipped with a synthesis circuit that synthesizes the image information output from the frame buffer circuit and the display image of the cursor output from the cursor image generation circuit and displays it on the display device, when moving the cursor, the buffer memo 6 There is no need to rewrite the previously stored image, which has the effect of speeding up the updating of the display on the display device as the cursor moves and reducing the burden on the central processing unit.

[Brief explanation of the drawing]

FIG. 1 is an output diagram showing an embodiment of the present invention, FIG. 2 is an output diagram showing the output of a conventional image control device, and FIG. 3 is an image stored in the papa memory in a conventional bitmap method of this kind. FIG. DESCRIPTION OF SYMBOLS 1...Keyboard, 4...Frame buffer circuit, 5...Display device, 21...Coordinate position signal generation circuit, 22...Cursor image generation circuit, 23...
...Cursor shape memory memory, 31...Synthesis circuit. Patent applicant: Anritsu Electric Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A frame buffer circuit that stores input image signals, a coordinate position signal generation circuit that outputs cursor position information to display a cursor on a display device based on information input from the keyboard, and a coordinate position signal generation circuit that stores the cursor shape in advance. a cursor image generation circuit that outputs a display image of the cursor based on a stored cursor shape memory, position information output from the coordinate position signal generation circuit, and shape information output from the cursor shape memory; An image control device comprising: a synthesis circuit that synthesizes image information output from the frame buffer circuit and a cursor display image output from the cursor image generation circuit and displays the resultant on a display device.