JPH04217292A - Monitor television scanning period adaptive picture processing device - Google Patents

Abstract

PURPOSE:To use an arbitrary television as a monitor television by forming the television so that a synchronizing signal and a picture signal, suited for a scanning period of the television intended for use as a monitor television, can be output. CONSTITUTION:A magnetic sensor 8 is placed in the vicinity of a television to detect leakage deflecting flux, a scanning period detecting part 7 detects a horizontal scanning period and a vertical scanning period, a selecting circuit 6 selects a scanning period suited for the detected period from a plurality of scanning periods preset in a synchronizing signal generating circuit 5, and the synchronizing signal generating circuit 5 outputs horizontal and vertical synchronizing signals of the selected scanning period. In a picture signal generating part 3, a picture signal, synchronized with the above-mentioned horizontal and vertical synchronizing signals, is formed and output via a D/A converter 4 based on scanning synchronous information selected from the synchronizing signal generating circuit 5.

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION The present invention relates to an image processing device capable of outputting a horizontal synchronization signal, a vertical synchronization signal, and an image signal that are compatible with the horizontal scanning period and vertical scanning period of any monitor television to be used. .

0002

2. Description of the Related Art Conventionally, a monitored device, such as a computer, radar, or image processing device, outputs a video signal corresponding to a fixed scanning frequency. Therefore, it is recommended to select a monitor TV that matches the above-mentioned scanning frequencies, or prepare a so-called auto-scan type monitor that can scan by adapting to various scanning frequencies, or An integrated device has been used as part of a device.

0003

[Problem to be Solved by the Invention] However, when using a monitor television that matches the scanning frequency of the monitored device, if the scanning frequency becomes different from the previous device due to updating of the monitored device, The monitor TV that was being used becomes unusable and a new monitor TV with a matching scanning frequency must be prepared, resulting in waste. Furthermore, since the scanning frequency of a monitor television cannot be determined unless it is measured with a measuring device, there is also the problem that it is not possible to determine whether or not it is compatible with the monitored device.

On the other hand, when looking at auto-scan type televisions, a type of resonant circuit such as a scanning deflection power supply circuit or a deflection circuit is used to cover a wide range (for example, a horizontal scanning frequency of 15 KHz).
Automatically changing the scanning frequency in response to the scanning frequency from the monitored circuit has the drawback of increasing production costs.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide horizontal and vertical synchronization signals matching the horizontal and vertical scanning frequencies of a monitor television to be used, their horizontal scanning period, and vertical scanning. An object of the present invention is to provide a monitor television scanning cycle adaptive image processing device capable of outputting an image signal having a size determined by the cycle.

[0006]

Means for Solving the Problems The present invention has the following means for achieving the above object. That is, the monitor television scanning period adaptive image processing apparatus of the present invention includes a magnetic sensor for detecting horizontal deflection leakage magnetic field and vertical deflection leakage magnetic field by bringing it close to the monitor television to be used; and a signal from the magnetic sensor. a scanning period detection section that detects a horizontal scanning period and a vertical scanning period; a horizontal scanning period and a vertical scanning period that match the detection period from among a plurality of preset periods according to a signal from the scanning period detection section; a selection circuit for selecting; a plurality of types of horizontal scanning periods and a plurality of types of vertical scanning periods used in monitor televisions are set in advance, and a horizontal synchronizing signal of the horizontal scanning period selected by the selection circuit; a synchronization signal generation circuit that outputs a vertical synchronization signal of a selected vertical scanning period; an image processing section that outputs an image signal by defining horizontal and vertical regions of the image signal according to the selected horizontal scanning period and vertical scanning period; A monitor television scanning cycle adaptive image processing device is characterized by comprising;

[0007]

[Effect] The action will be described below. The electron beam of a television cathode ray tube is scanned horizontally and vertically by magnetic fields generated by a horizontal deflection coil and a vertical deflection coil. This deflection magnetic field acts inside the cathode ray tube, but it also leaks to the outside of the television to a small extent.

The device of the present invention utilizes this leakage magnetic field to detect the horizontal scanning period and vertical scanning period of a television to be used as a monitor. That is, the leakage magnetic field is detected by bringing the magnetic sensor included in the device of the present invention close to the monitor television.

[0009] The detected signal is sent to a scanning period detection section, where a horizontal scanning period and a vertical scanning period are detected. This detected periodic signal is sent to the selection circuit. This selection circuit selects a scanning period that matches the scanning period previously detected by the magnetic sensor from among a plurality of scanning periods that are set in advance in the periodic signal generating circuit as the horizontal scanning period and vertical scanning period used in the monitor television. Select. The synchronization signal generation circuit outputs a horizontal scanning synchronization signal and a vertical synchronization signal of the selected scanning period.

Further, the image processing section arranges the input monitored image signals into image signals matching an image size determined by the selected horizontal scanning period and vertical scanning period, and outputs the arranged image signals. Since the synchronization signal generation circuit has a plurality of horizontal scanning periods and a plurality of vertical scanning periods used for monitor television set in advance, it is possible to send synchronization signals and image signals suitable for various monitor televisions.

[0011]

Embodiments Hereinafter, embodiments of the image processing apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of an embodiment device. The magnetic sensor 8 is connected to the main body of the image processing apparatus by a cable or the like, and can be extended and brought close to the monitor television. Then, the leakage deflection magnetic field near the cathode ray tube of the monitor television is detected.

FIG. 2 is a diagram showing an example of a horizontal deflection magnetic field of a cathode ray tube. 9 is a cathode ray tube, and 10 is a horizontal deflection coil. When a deflection current is passed through this, a horizontal deflection magnetic field φh leaks to the front of the cathode ray tube. This magnetic field φh is detected by a magnetic sensor 8. The detection signal is sent to the scanning period detection section 7. The scanning period detection section 7 detects the horizontal scanning period from the detection signal.

The detected periodic signal is sent to the selection circuit 6, and the selection circuit 6 uses this information to send the synchronization signal generation circuit 5 to a plurality of preset scanning periods used in various monitor televisions. A horizontal scanning period matching the detected scanning period is selected from among the scanning periods. The above description has been about the horizontal scanning system, starting with the detection of the horizontal deflection magnetic field φh, but the same applies to the vertical scanning system.

The synchronizing signal generating circuit 5 outputs horizontal synchronizing signals and vertical synchronizing signals of selected horizontal scanning periods and vertical scanning periods. At the same time, information on the horizontal scanning period and the vertical scanning period is sent to the image signal generating section 3.

On the other hand, a signal from a computer or a monitored device such as a radar is input to the signal input/output section 1, and is sent to the calculation section 2 via the signal input/output section 1. In the arithmetic unit 2, after inputting screen aspect ratio and resolution information separately as necessary, arithmetic processing similar to that in a normal image processing device is performed, and the result is sent to the image signal generating unit 3. Image signal generator 3
Then, based on the horizontal scanning period and vertical scanning period information from the synchronization signal generation circuit 5, the dot clock frequency of the image signal is changed to keep the number of horizontal pixels in the horizontal scanning period constant, and the image signal is output.

This image signal is converted into an analog signal by the D/A converter 4 and output to the monitor television together with a horizontal synchronizing signal and a vertical synchronizing signal. For example, the horizontal scanning frequency of a television used as a monitor is 15.
75KHZ, 24KHZ, 31KHZ, 50KHZ, 6
There are many types such as 4KHZ, 85KHZ, 128KHZ, etc., but by using the image processing device of the present invention, it is possible to supply horizontal synchronization signals, vertical synchronization signals, and image signals that match the scanning frequency of any television set. I can do it.

Normally, commercially available televisions have ±
Since it has a frequency pull-in range of about 1KHZ,
The monitor television operates even if the frequency of the synchronization signal output from the device of the present invention does not completely match the frequency detected by the magnetic sensor. For example, if the frequency detected by the magnetic sensor is within the range of 30 to 32 KHZ, the apparatus of the present invention will operate satisfactorily even if the frequency outputted from the device is 31 KHZ.

[0018]

As explained above, the image processing device of the present invention has a plurality of horizontal scanning periods and a plurality of vertical scanning periods used in a monitor television set in advance, and a horizontal synchronizing signal of a selected period and a vertical scanning period. While a synchronization signal is output and an image signal synchronized with this synchronization signal is output, an equipped magnetic sensor detects the scanning cycle of the television to be used as a monitor.
As a result, a scanning cycle that matches the detected scanning cycle is selected, which has the advantage that any TV can be used as a monitor TV.

[
[0019] As a result, there is no need to use an expensive auto-scan type TV as the monitor, and there is no need to use an expensive auto-scan type TV as the monitor. This has the advantage that it also eliminates

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of a monitor television scanning cycle adaptive image processing apparatus according to the present invention.

FIG. 2 is a diagram illustrating a method of detecting a deflection magnetic field of a monitor television using a magnetic sensor.

[Explanation of symbols]

1 Signal input/output section 2 Arithmetic section 3 Image signal generation section 4 D/A converter 5 Synchronous signal generation circuit 6 Selection circuit 7 Scanning period detection section 8 Magnetic sensor 9 Cathode ray tube 10 Horizontal deflection coil

Claims (1)

[Claims] [Claim 1] A magnetic sensor for detecting horizontal deflection leakage magnetic field and vertical deflection leakage magnetic field by bringing it close to a monitor television to be used; detecting a horizontal scanning period and a vertical scanning period by signals from the magnetic sensor. a scanning period detection section; a selection circuit for selecting a horizontal scanning period and a vertical scanning period that match the detection period from among a plurality of preset periods based on a signal from the scanning period detection section; a monitor television; A plurality of types of horizontal scanning periods and a plurality of types of vertical scanning periods used for are set in advance,
a synchronization signal generation circuit that outputs a horizontal synchronization signal with a horizontal scan period selected by the selection circuit and a vertical synchronization signal with a vertical scan period selected; 1. A monitor television scanning cycle adaptive image processing device, comprising: an image processing unit that outputs an image signal by defining a region;