JPH07123333A - Cursor display method - Google Patents

Abstract

PURPOSE:To display a cursor managed by a computer or the like on a display device at a different aspect ratio or the like in a desired size all over the picture areas in real time. CONSTITUTION:A video signal from a video signal input part 1 is converted into a digital signal by an A/D conversion part 2 and recorded in a frame memory part 3, and a memory control part 4 counts the display positions of cursor data from the video signals recorded in the frame memory part and records address data in a cursor address register part 7. On the other hand, a graphic control part 10 controls cursor data generated by a cursor generation part 8 based on the address data and performs the write and read of a cursor memory part 9, and an output control part 15 suitably and selectively synthesizes a main video signal, the read signal of the frame memory part and the read signal of the cursor memory part while controlling a MIX part 14, converts the result to an analog signal at a D/A conversion part 17 and transmits it from a video output part 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cursor display method, and more particularly to a cursor display method that can be controlled under the control of a computer or the like in an image processing apparatus such as an HDTV system.

[0002]

2. Description of the Related Art Conventionally, there are roughly two methods for displaying a cursor of a computer or the like on another image processing apparatus or the like. One method is, as shown in FIG. 3, a video signal input unit 1 for inputting a video signal of a computer or the like,
An A / D converter 2 for converting the video signal from the video signal input unit 1 into a digital signal, a frame memory unit 3 for recording the digital signal from the A / D converter 2, and a sync signal input at the same time as the video signal. A memory for controlling data writing to the frame memory unit 3 based on a synchronizing signal such as a horizontal synchronizing signal input to the unit 5 and reading of data from the frame memory unit 3 based on a synchronizing signal from the synchronizing signal generating unit 6. Control unit 4 and cursor address information input unit 80 for inputting cursor address information at the same time as the video signal
A cursor address register section 7 for recording the address data, a cursor generating section 8 for generating the cursor data, and a cursor memory section 9 for recording the cursor data.
A graphic control unit 10 for controlling recording and reading to and from the cursor memory unit 9 based on address data of the cursor address register unit 7, a main video signal having a synchronization signal of the synchronization generation unit 6, and the frame memory unit 3 And a MIX section 14 for selecting and synthesizing the read signal of the cursor memory section 9 at a suitable time.
A signal from the IX unit 14 is configured to be sent from the video output unit 18 in accordance with the signal format of the display device, address information of cursor data of a computer or the like is sent separately from the video signal, and based on the address information, This is a method of generating and displaying a cursor in the cursor generator. As another method, as shown in FIG. 4, a video signal input unit 1 for inputting a video signal of a computer or the like, an A / D conversion unit 2 for converting a video signal from the video signal input unit 1 into a digital signal, A frame memory section 3 for recording a digital signal from the A / D conversion section 2 and a frame memory section 3 for recording to the frame memory section 3 based on a synchronizing signal such as a horizontal synchronizing signal input to a synchronizing signal input section 5 simultaneously with the video signal. A memory control unit 4 that controls data writing and data reading from the frame memory unit 3 based on a synchronization signal from a synchronization signal generation unit.
And a MIX section 14 for timely selecting and synthesizing a main video signal having a sync signal of the sync signal generating section and a read signal of the frame memory section 3, and the signal from the MIX section 14 is a signal of a display device. This is a method in which the video signal is sent from the video output unit 18 in accordance with the format, the video signal of a computer or the like is enlarged or reduced, and it is combined and displayed with image data of an image processing apparatus or the like. In the former case, it is necessary to transmit and process the cursor information separately from the video signal, and the processing speed for displaying the cursor is slow, so the display of the cursor is delayed from the display of the video signal, and the cursor display is unnatural. It was In the latter case, there is a problem that the cursor is enlarged or reduced and the cursor cannot be displayed in the entire screen area due to the difference in aspect ratio and the difference in the number of scanning lines.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks and allows a cursor generated by a computer or the like to be displayed on a display device having a different aspect ratio or number of scanning lines in real time, in an appropriate size, and in the entire screen area. It is an object of the present invention to provide a cursor display method for displaying a cursor on a screen and controlling the cursor under the control of a computer or the like.

[0004]

In order to solve the above-mentioned problems, the present invention provides a video signal input section for inputting a video signal of a computer or the like, and an A / D for converting the video signal from the video signal input section into a digital signal. A D conversion unit, a frame memory unit for recording a digital signal from the A / D conversion unit, and data writing and synchronization to the frame memory unit based on a synchronization signal such as a horizontal synchronization signal input simultaneously with the video signal. The reading of data from the frame memory unit is controlled based on the synchronization signal from the signal generation unit, and the display position in the horizontal and vertical directions of the cursor data is determined from the video signal recorded in the frame memory unit by the number of pixels and the number of scanning lines. Memory control unit that counts, a cursor address register unit that records the address data, and a cursor generation unit that generates cursor data A cursor memory section for recording the cursor data, a graphic control section for controlling writing and reading to and from the cursor memory section based on address data of a cursor address register section, and a main video signal having a synchronization signal of the synchronization generating section. And a read signal of the frame memory unit and a read signal of the cursor memory unit, which are controlled by the control unit based on a control signal from a computer device or the like to be selected and combined at appropriate times, and a signal from the MIX unit. Is configured to be output from the video output unit according to the signal format of the display device.

[0005]

With the above configuration, in the cursor display method of the present invention, the video signal of the computer device or the like is converted into a digital signal and written in the frame memory unit.
The horizontal and vertical display positions of the cursor data are counted from the video signal recorded in the frame memory unit by the number of pixels and scanning lines, and the cursor address data is recorded in the cursor address register unit. The generated cursor data is written to the cursor memory unit based on the contents of the cursor address register unit, and the main video signal having the synchronization signal of the synchronization generation unit, the read signal of the frame memory unit, and the read signal of the cursor memory unit are timely They are selected, combined, and output according to the signal format of the display device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cursor display method according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts showing an embodiment of a cursor display method according to the present invention. A video signal input unit 1 receives a video signal from a computer or the like by performing impedance matching or the like, amplifies it to an appropriate level, and sends it to the next block. Two
Is an A / D conversion unit that converts an analog signal from the video signal input unit into a digital signal. Reference numeral 3 is a frame memory unit having a FIFO structure for recording the digital signal from the A / D conversion unit 2. Reference numeral 4 denotes a memory control unit, which receives a synchronizing signal such as a horizontal synchronizing signal and a vertical synchronizing signal, which are input at the same time as the video signal, with matching impedances, and amplifies to a proper level from a synchronizing signal input unit 5. Based on the control of data writing to the frame memory unit, control of reading data from the frame memory unit 3 based on the synchronization signal from the synchronization signal generation unit 6, and from the video signal recorded in the frame memory unit. The number of pixels and the number of scanning lines at the horizontal and vertical display positions of the cursor data are counted to generate the cursor address data. Reference numeral 7 is a cursor address register section for recording the address data, 8 is a cursor generating section for generating cursor data, and 9 is a cursor memory section. A graphic control unit 10 controls writing and reading of a cursor signal generated by the cursor generation unit 8 in the cursor memory unit 9 based on the address data of the cursor address register unit 7. Reference numeral 13 is a video input unit for receiving a video signal of the HDTV system or the like. The video signal is converted into a digital signal by the A / D conversion unit 12, variously processed by the image processing unit 11 and sent out as a main video signal. . 14 is M
In the IX unit, the control unit 15 receives the main video signal, the read signal of the frame memory unit 3 and the read signal of the cursor memory unit 9 from the control signal input unit 16 based on the control signal of the computer device or the like. Are selected and combined in a timely manner, and the combined signal is converted into an analog signal by the D / A conversion unit 17 and sent from the video output unit 18 to a display device or the like.

Next, the operation of the cursor display method according to the present invention will be described with reference to the cursor address extraction PC image of FIG.
Fig.2- (b) cursor address extraction table and Fig.2-
A detailed description will be given based on the operation principle diagram such as the address trigger signal diagram of (c). FIG. 2- (a) shows an image in which a cursor A is displayed in the same color such as green on the screen of a computer or the like. FIG. 2B shows a state in which the image data shown in FIG. 2A is A / D converted and written in the frame memory unit 3. The numeral 23 in the drawing indicates the address of the cursor A. , L3 (the third line in the vertical direction) and D4 (the fourth dot in the horizontal direction). The cursor address information is such that the memory control unit sets the frame image data in the frame memory unit to 0 for each dot in the horizontal direction with vertical synchronization as a start timing.
1,02, ..., 11,12, ..., 21,2
2, 23, and 24, when the cursor data A signal (trigger pulse signal shown in FIG. 2- (c)) is detected at 34, the cursor data A is used as a trigger to stop counting. , The cursor address 34 is set in the cursor address register. Further, since the frame memory unit uses the memory having the FIFO structure, it is possible to read while writing the frame data, and the delay of reading is suppressed to 1 frame at the maximum, which may be regarded as real-time reading. If the screen of the computer or the like is a cursor display screen, the MIX unit 14 does not combine the signal from the frame memory unit 3 with the main video signal, but combines the read signal of the cursor memory unit 9 with the main video signal. It is controlled by the output control unit 15 by a control signal from a computer or the like, and when the screen of the computer or the like is other than the cursor display screen, MIX
In the unit 14, the signal from the frame memory unit 3 is combined with the main video signal, and the control signal from the computer or the like is controlled by the control unit 15 so as not to combine the read signal of the cursor memory unit 9 with the main video signal.

[0008]

As described above, according to the cursor display method of the present invention, a cursor generated by a computer or the like can be displayed in real time on a display device having a different aspect ratio or a different number of scanning lines in an appropriate size. Display in the screen area,
A cursor display method capable of controlling a cursor under the control of a computer or the like can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram of essential parts showing an embodiment of a cursor display method according to the present invention.

FIG. 2 is an operation principle diagram showing an operation principle of a cursor display method according to the present invention, in which (a) is a PC image for extracting a cursor address, (b) is a cursor address extraction table, and (c) is an address trigger signal. .

FIG. 3 is a principal block diagram showing an example of a conventional cursor display method.

FIG. 4 is a block diagram of essential parts showing another example of a conventional cursor display method.

[Explanation of symbols]

 1 Video Input Section 2 A / D Conversion Section 3 Frame Memory Section 4 Memory Control Section 5 Sync Signal Input Section 6 Sync Signal Generation Section 7 Cursor Address Register Section 8 Cursor Generation Section 9 Cursor Memory Section 10 Graphic Control Section 11 Image Processing Section 12 A / D conversion unit 13 Video signal input unit 14 MIX unit 15 Output control unit 16 Control signal input unit 17 D / A conversion unit 18 Video output unit

Claims (2)

[Claims] 1. A video signal input unit for inputting a video signal of a computer device, an A / D conversion unit for converting the video signal from the video signal input unit into a digital signal, and a digital signal for the A / D conversion unit. A frame memory section for recording
Controlling writing of data to the frame memory unit based on a synchronizing signal such as a horizontal synchronizing signal input at the same time as the video signal and reading of data from the frame memory unit based on a synchronizing signal from the synchronizing signal generating unit; A memory control unit that counts the number of pixels and the number of scanning lines at the horizontal and vertical display positions of the cursor data from the video signal recorded in the frame memory unit, a cursor address register unit that records the address data, and cursor data. Of a cursor generation unit for generating the cursor data, a cursor memory unit for recording the cursor data, a graphic control unit for controlling writing / reading to / from the cursor memory unit based on the address data of the cursor address register unit, and the synchronization signal generation unit. Main video signal with sync signal and the frame memory section The read signal and the read signal of the cursor memory unit are controlled by the control unit based on a control signal from a computer device or the like to be selected and combined at appropriate time, and a MIX unit for synthesizing the signal from the MIX unit of the display device. A cursor display method that is sent from the output section according to the format. 2. The memory device of the frame memory unit comprises:
2. The cursor display method according to claim 1, wherein the method has a FIFO structure.