JPS5845029B2 - image display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display device, and particularly provides an image display device that monitors images sent from a television camera and displays digital signals sent from a digital image memory.

Hereinafter, a case in which a color image is displayed will be described as an example.

In color image processing using a computer, it is necessary to display a digital color image as a result of the processing on a color television monitor.

In such cases, conventional methods have used a dedicated device as a digital color image display device.

Such a display device uses a common television color cathode ray tube and its video circuit system.

For example, in FIG. 1, three components R, G, and B of a digital color image sent from a computer are stored in a memory 1.

Each component 2, 3.4 of the digital color image stored in the memory 1 is read out from each signal line by the synchronization signal 14 from the synchronization signal generation circuit 15 and sent to the digital-to-analog converter 5, 6゜7. are respectively supplied to three types of analog signals 9, 10°, 11, and a color television set 12.
is input.

These three types of signals 9, 10, and 11 are generated by the synchronization signal generation circuit 1.
It is used to control the intensities of the three electron beams in the color television set 12 in synchronization with the progressive scanning synchronization signal 12 from 5.

When digitizing a color image from a color TV camera and inputting it into a computer, it is necessary to monitor the input image, but at present, a color TV monitor separate from the above-mentioned display device is used at this time.

The present invention provides a method in which either an image from a color TV camera or a color image as a digital image can be selected and displayed by a switching command from a control circuit.

By using this invention, a color television device can be used both as a TV camera monitor and as a digital color image display device, and the cost may be lower than that of conventional methods.

An embodiment of this invention will be explained with reference to FIG.

The ITV camera 20 receives a synchronization signal 22 for interlaced scanning from a synchronization signal generation circuit 26, and a video signal 23 resulting from scanning based on this signal is sent to the color television device 13 and is used as a monitor image of the ITV camera 20. It will be displayed.

On the other hand, the digital color image is stored in the digital memory device 24.
are stored for each color component image R (red component), G (green component), and B (blue component).

The control circuit 25 controls each of the synchronization signal generation circuit 26, the digital memory device 24, and the digital-to-analog converter 27, and when it is desired to use the color television set 12 as a digital color image display device, the synchronization signal generation circuit is controlled by the control signal 228. 26 stops the interlaced scanning signal 22, and instead a progressive scanning synchronizing signal 12 is generated and sent to the color television set 13.

Note that the control signal 28 can be generated by a control circuit scan changeover switch attached to the control circuit or a changeover instruction signal 32 from a computer.

The control circuit 25 also receives and receives a synchronization signal 29 from the synchronization signal generation circuit 26, and based on this, the control circuit 25 controls the digital memory device 2.
The data transfer rate from 4 to the digital-to-analog conversion circuit 27 and the input timing of analog color component video signals 9, 10, and 11 to the color television set 13 are controlled by control signals 30 and 31, respectively.

Note that the digital color images for each color component stored in the digital memory device 24 are read out from the signal lines under the control of the control signal 30 and applied to the digital-to-analog converters 5, 6.7, respectively.

Next, the operation within the color television set 13 will be explained with reference to FIG.

When the color television device 13 is used as a monitor for the video of the ITVTV camera, the video signal 23 of the TVTV camera is input to the video circuit 42 and processed, and the color component signals 44, 45, 46 are output from the matrix circuit 43. , and a synchronization signal 48 is output from the synchronization separation circuit 47, respectively.

The color component signals 44, 45, and 46 are applied to a cathode ray tube 50 after passing through a video amplification circuit 49.

The synchronization signal 48 is connected to the vertical deflection signal 52 in the deflection circuit 51.
and horizontal deflection signal 53.

These vertical deflection signal 52 and horizontal deflection signal 53 are applied to a deflection yoke 54 of the cathode ray tube and used for scanning the image beam.

On the other hand, when the color television device 13 is used as a digital color image display device, the color component video signals 9, 10, 11 after digital-to-analog conversion are transmitted to the video amplifier circuit 4.
9.

In order to deflect these video signals, an external synchronization signal 56 from the synchronization signal generation circuit 26 in FIG.
A vertical deflection signal 52 and a horizontal deflection signal 53 are generated from this synchronization signal 56 and applied to the deflection yoke 54.

As is clear from the above description, the color television set 13 under the control circuit 25 can be used either as a monitor for ITV camera signals or as a display device for computer-processed digital color images.

By connecting and integrating the control circuit 25 and the digital memory device 24 with a computer, it is possible to integrate the control circuit 25 and the digital memory device 24 into a general-purpose color image processing system.

According to the invention described above, the television device can be used both as a monitor for a TV camera and as a digital image display device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional image display device, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a block diagram showing a part of FIG. 2 in detail. 12 is a synchronization signal for sequential scanning, 13 is a display device, and 20 is an I
The TV TV camera 2 has a synchronization signal for interlaced scanning, 24 a digital memory, 25 a control circuit, 26 a synchronization signal generation circuit, and 27 a D/A conversion circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A synchronization signal generation circuit that generates an interlaced scan synchronization signal input to a television camera or a progressive scan synchronization signal input to a display device, a digital memory device that stores digital image signals, and a digital memory device that stores digital image signals. Digital image signal to analog image f? a digital-to-analog conversion circuit for converting into a signal, generating the interlaced scanning synchronization signal and sending a scanning result video signal based on the interlaced scanning synchronization signal to the display device;
Alternatively, generating the sequential scanning synchronizing signal and sending the sequential scanning synchronizing signal to the display device, and transmitting data from the digital memory device to the digital-to-analog conversion circuit based on the synchronizing signal from the synchronizing signal generating circuit. An image display device comprising: a control circuit for controlling transfer and input timing of the analog video signal to the display device; and means for sending a deflection synchronization signal of the display device to the display device.