JPH0522757A - Position detecting method - Google Patents

Abstract

PURPOSE:To detect the position of a television camera laid opposite toward the CRT. CONSTITUTION:Television camera 8 is laid opposite toward CRT 7 so as to be able to take picture of a very narrow range of the CRT 7. A predetermined pattern is recorded in recording memory 5 so that a range of 1/2 of the screen of CRT 7 can be lit. In the television camera 8, the content of recording memory 5 is reloaded so as to be able to switch the light emitting range of the camera 8 in the case when the light emitting range cannot be confirmed. When the light emitting range of CRT 7 can be detected by the television camera 8, the camera 8 lights a range half of the light emitting range. The same action as the above is repeated in the following process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting method suitable for use in, for example, measuring CRT convergence.

[0002]

2. Description of the Related Art Conventionally, when measuring the convergence of a CRT, a television camera is placed facing the CRT. Then, a preset pattern is displayed on the display screen of the CRT, the pattern is photographed by the TV camera, and the CRT is displayed.
I try to measure the convergence of.

[0003]

However, in the conventional apparatus, a fixed pattern is displayed on the CRT and the pattern is detected by the TV camera (sensor). Therefore, the TV camera is located at a position opposite to the pattern. Has to be moved and arranged, and there is a problem that it is not possible to measure the convergence at an arbitrary position, or if it can be done, it takes time.

The present invention has been made in view of such a situation, and it is possible to detect an arbitrary position and measure, for example, convergence of the position.

[0005]

According to the position detecting method of the present invention, a half of a predetermined range of a light emitting device is caused to emit light,
When the light emitting area cannot be detected by the sensor, the other half area is caused to emit light, and when the light emitting area can be detected by the sensor, 1 of the light emitting area is detected.
It is characterized in that the operation of emitting light in the area of / 2 is repeated.

[0006]

In the position detecting method of the above construction, for example, C
A half area of the screen of the light emitting device composed of RT emits light. For example, when the light emitting area cannot be detected by a sensor such as a television camera,
Area 2 is illuminated. When the light emitting area can be detected by the sensor, half the light emitting area is emitted. Hereinafter, the same operation is repeated to detect the area facing the sensor.

Therefore, no matter which position the sensor is opposed to the light emitting device, that position can be detected promptly.

[0008]

1 is a block diagram showing the construction of an embodiment of a convergence measuring apparatus to which the position detecting method of the present invention is applied. The input unit 1 is composed of a keyboard, a mouse, etc., and is operated when inputting a predetermined command or data to the microcomputer 2. The selector 3 selects either the data output from the microcomputer 2 or the timing signal (address signal) output from the television (TV) timing generator 4, and the signal pattern recording memory 5
Supply to. The video amplifier 6 synthesizes the data supplied from the signal pattern recording memory 5 and the synchronization signal supplied from the television timing generator 4, and supplies them to the CRT 7 (light emitting device). TV camera (sensor) 8 is CRT 7
Are located opposite to. The output of the TV camera 8 is
It is adapted to be supplied to the microcomputer 2 via the interface 9.

Next, the operation will be described. When the input unit 1 is operated to instruct the microcomputer 2 to measure the convergence, the microcomputer 2 generates the data of the pattern to be displayed on the CRT 7. This data is supplied to and stored in the signal pattern recording memory 5 via the selector 3. At this time, the stored pattern is a pattern for causing the entire CRT 7 to emit light, as shown in FIG. When this pattern is stored, an address signal is generated from the television timing generator 4, and this address signal is supplied to the signal pattern recording memory 5 via the selector 3. As a result, the pattern data is read from the recording memory 5 and supplied to the video amplifier 6. The video amplifier 6 synthesizes this data with the synchronization signal output from the television timing generator 4, and supplies the synthesized signal to the CRT 7. As a result, the entire screen of the CRT 7 emits light as shown in FIG.

The television camera 8 has a screen of the CRT 7
The television camera 8 is arranged so that an extremely narrow range can be photographed, and the television camera 8 detects light at the arranged position and outputs it to the microcomputer 2 via the interface 9. Now, as shown in FIG.
Since the whole is being emitted, the television camera 8 can detect this light.

After confirming the detection of the light emitting area from the output of the television camera 8, the microcomputer 2 next generates pattern data such that the right half of the screen is made to emit light and the left half is turned off. .. This data is written in the recording memory 5 via the selector 3. When the address data output from the television timing generator 4 is supplied to the recording memory 5 via the selector 3, the recording memory 5
This pattern is read from, is output to the CRT 7 via the video amplifier 6, and is displayed. This allows CR
The right half of T7 is illuminated and the left half is extinguished.

Now, assuming that the television camera 8 is arranged opposite to the left half area of the CRT 7, the television camera 8 cannot detect the light emitting area at this time. When the microcomputer 2 determines that the television camera 8 cannot detect the light emitting area, the microcomputer 2 causes the half area on the opposite side to emit light and the area that has been emitting light to turn off. Rewrite the pattern of 5. As a result, in the CRT 7, as shown in FIG. 2B, the left half of the screen is illuminated and the right half is extinguished. At this time, the TV camera 8
The light emitting area can be detected.

When the light emitting area is detected, the microcomputer 2 emits light in a half area of the light emitting area (half area on the left side of the screen as shown in FIG. 2B), and the other half area. Turn off the area. Figure 2
As shown in (C), when the right half area is in a light emitting state, the television camera 8 can detect this light emitting area. When the light emitting area is detected, the microcomputer 2 makes the half area of the light emitting area emit light again, and turns off the other half area. If the right half area of the light emitting area shown in FIG. 2C is made to emit light, the television camera 8 cannot detect the light emitting area. At this time, the microcomputer 2 switches the light emitting region so that the left half emits light and the right half turns off (FIG. 2D). At this time, the television camera 8 can detect the light emitting area.

Of the light emitting region shown in FIG. 2D, when the upper half region is made to emit light and the lower half region is made to be off,
The television camera 8 cannot detect the light emitting area. At this time, the microcomputer 2 switches its light emitting area. Then, as shown in FIG. 2E, when the lower half area is emitted, the television camera 8 can detect the emission area.

In the following, as shown in FIGS. 2 (F) and 2 (G), when the light emitting area cannot be detected, the light emitting areas are switched so that the light emitting area can be detected. In (2), by repeating the light emission in half the area, only the position facing the television camera 8 can be finally made to emit light as shown in FIG.

Therefore, in this state, the microcomputer 2 starts measuring the convergence from the output of the television camera 8.

In the above description, the entire screen is first lit, and thereafter, the operation of reducing the luminescent area to 1/2 is repeated, but, for example, as shown in FIG. 3, the television camera 8 is arranged. When the present position is known in advance, the input unit 1 can be operated to input the range (search area), and the above-described operation can be repeated only for the range. By doing so, it is possible to more quickly detect the position where the television camera 8 faces.

In the above description, the position of the television camera 8 arranged so as to face the CRT 7 is detected.
The present invention is not limited to this, and can be applied to a case where a sensor is arranged facing a light emitting device and a position facing the sensor of the light emitting device is detected.

[0019]

As described above, according to the position detecting method of the present invention, a half of a predetermined range is made to emit light, and when the light emitting area cannot be detected, the light emitting area is switched to change the light emitting area. When it is possible to detect the position, since the operation of causing the half of the light emitting region to emit light is repeated, it is possible to detect the position regardless of the position. ..

Therefore, when this method is applied to a convergence measuring device, it becomes possible to quickly measure the convergence at an arbitrary position.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a convergence measuring device to which a position detecting method of the present invention is applied.

FIG. 2 is a diagram showing a process of changing a light emitting region in the embodiment of FIG.

FIG. 3 is a diagram showing a search range of a sensor.

[Explanation of symbols]

 1 Input Section 2 Microcomputer 3 Selector 4 Television Timing Generator 5 Signal Pattern Recording Memory 6 Video Amplifier 7 CRT 8 Television Camera

Claims (1)

Claim: What is claimed is: 1. A position detecting method in which a sensor is arranged facing a light emitting device and a position of the light emitting device facing the sensor is detected. When the second area is made to emit light and the light emitting area cannot be detected by the sensor, the other half area is made to emit light and when the light emitting area can be detected by the sensor, the light emission A position detecting method characterized in that half the area is made to emit light, and the same operation is repeated thereafter to detect the area facing the sensor.