JPH08182013A - Digital convergence automatic adjustment device - Google Patents

Abstract

PURPOSE: To attain high accuracy and the same criterion for the measurement by displaying a special pattern (dot display only for adjustment point) for each color and measuring accurately a gravity center of a relative position on a measurement pattern with a camera and a visual sensor. CONSTITUTION: The device is made up of a camera image fetch section 1, an image processing section 2 by a visual sensor, a CPU section 3 being a deviation arithmetic operation, generation of feedback data or the like and an entire command and a jig 4 reading/writing in-set digital convergence data and a configuration 5 controlling a set to be checked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automation device for convergence adjustment which is the main adjustment of a projection television.

[0002]

2. Description of the Related Art An outline of digital convergence adjustment is shown below.

The projection type television displays three colors of light projected from CRTs independent of R, G and B on a screen.
It is displayed at the same position.

It is difficult to match the colors on the screen due to the mounting accuracy of the CRT, the magnetic field variation of the deflection yoke (hereinafter abbreviated as DY) which controls the electron beam in each CRT, and the like. Therefore, a convergence correction yoke (hereinafter abbreviated as CY) for newly correcting DY is provided to change the current value for each of the horizontal and vertical scanning areas to control the magnetic field so that the R, G, and B colors match in the entire screen. To do.

In the prior art for adjusting this, the operator visually confirms the amount of color misregistration at each point on the screen to make the adjustment. Therefore, a lot of time is required. or,
Since the horizontal direction is temporally continuous, the L.
P. Data is continuously converted at F. Therefore, only one point is not independent data, and it is necessary to make adjustments in consideration of the amount of left / right deviation, which requires skill level of work.

[0006]

The operator needs to be skilled and requires a great deal of adjustment time because the operator visually measures and adjusts at each point.

An object of the present invention is to capture an image with a camera and a visual sensor, create feedback data with a personal computer, and then automatically write the data into a set. The precision depending on the skill of an operator is highly accurate and the same standard. By ensuring the stability of accuracy by making the automatic adjustment,
The goal is to be less skilled.

[0008]

In order to achieve the above object, the present invention achieves high precision by taking in the position of each point of each color alternately displayed on the television screen with a camera and calculating the center of gravity with a visual sensor. After measuring and calculating and correcting the color shift for each point of each color, all points are adjusted collectively.

[0009]

[Function] High precision and the same standard of measurement by displaying a special pattern (dot display only for adjustment points) for each color and accurately measuring the relative position on the measurement screen with the camera and visual sensor. Can be realized. Further, by processing the deviation amount and the feedback amount in the personal computer, it is possible to speed up and automate the adjustment speed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a digital convergence automatic adjustment device. 1 is a camera image capturing unit, 2 is an image processing unit using a visual sensor, 3 is a displacement amount calculation, feedback data creation, etc., a CPU unit of the overall command unit, 4 is a jig for reading / writing digital convergence data in a set Abbreviated) and controls the checked set of 5.

In this apparatus, dot display is performed with the reference color (green) adjusted in the previous step, image data is fetched,
Create a standard color position data file in the personal computer. Subsequently, the adjustment color (red, blue) dots are displayed, and similarly an adjustment color position data file is created. Therefore, the difference between the horizontal and vertical data of each point in the reference color position data file and the adjusted color position data file is used as the color shift amount, and then the feedback amount is calculated. In addition, the data of the adjustment point is subjected to high-speed interpolation calculation processing, written in the SRAM in the digital control jig, and displayed on the set screen with the data. After that, the image of the adjusted color displayed by the fed-back new data is captured by the camera, and the same adjustment as described above is repeated.

An outline of image processing will be described with reference to FIG.

6 is a set displaying a special dot pattern for checking, 7 is the field of view of the camera, 8 is a specific window (measures only a certain range), 9 and 10 are the x and y coordinates of the dot after the center of gravity calculation. Show.

First, the display dots on the screen are measured by a plurality of cameras, and the measurement area is limited at each point (specific window 8) to prevent disturbance from entering.
The luminance center of gravity is calculated, and the x and y coordinates are measured with sub-pixel accuracy.

With reference to FIG. 3, the amount of convergence deviation (hereinafter, abbreviated as the amount of misconversion) and the creation of feedback data will be described.

11-R (R standard data), 11-B (B
(Standard data) is previously filed and placed in the CPU 3.

First, the bus line of the digital control jig is passed through the set, the reference color (green) data 11-G is read to the display data file 12, and after interpolation calculation 17, it is written to the SRAM 13 in the digital control jig and the data is used. The standard color is displayed. It is measured by the camera, image-processed by the visual sensor 2, the position data is transmitted to the CPU 3, and then filed as the reference color position data 14-G. Then CP
R standard data 11-R in U3 (B standard data 11-B)
After passing through the display data file 12 and performing an interpolation calculation 17, the data is written in the SRAM in the digital computer 4 and the digital computer display of R is performed. After the image processing is performed in the same manner as G, the adjusted color position data 14-G (14-B) is filed.

Thereafter, the difference between the reference color position data 14-G and the adjusted color position data 14-R (14-B) (miscon amount 1
5) is calculated. The display data file is changed by multiplying the miscon quantity obtained here by the feedback coefficient for each point. Then, after interpolation calculation 17, S
The RAM 13 is written and displayed, and the measurement adjustment is repeated.

The interpolation calculation will be described with reference to FIG.

In the conventional method, the CPU in the digital control jig was used for interpolation, but the processing capacity of the CPU was slow. In this device, the interpolation calculation is performed by the personal computer CPU 3, and then the data is written in the SRAM 13 in the digital control jig. In addition, we have developed a new interpolation method based on Lagrange interpolation in order to realize high-speed high-order curve interpolation.

Equations a ₀ (x), a ₁ (x), a ₂ (x), a _{3 in} the figure
(x), a ₄ (x), and 0 to 255 are previously filed as coefficients in the CPU, and the speed is increased by performing read-out calculation during interpolation calculation.

The special dot pattern will be described with reference to FIG.

In the conventional digital computer adjustment pattern, three colors of RGB are simultaneously displayed by the cross hatch pattern 18 and the amount of miscon is measured by using a color camera. However, there is color interference between R, G, B, and high precision. It was difficult to measure the amount of color shift. This time, a method of creating a single color special pattern and displaying RGB single color with a monochrome high sensitivity camera was used.

Further, since the horizontal and vertical movement points of the horizontal and vertical display portions on the actual screen are different from the adjustment point, that is, the horizontal movement point 19 and the vertical movement point 20, the special dot patterns are the horizontal special dot pattern 21 and the vertical special dot pattern. It is a different pattern from the special dot pattern 22. In addition, the number of dots for each of the horizontal special dot patterns 21 is 13 in the horizontal direction.
Points * vertical direction 7 points, totaling 91 points, vertical special dot pattern 22 is horizontal direction 12 points * vertical direction 7 points,
The total is 84 points.

[0026]

According to the present invention, it is possible to improve the productivity of the whole line by automatic adjustment and speeding up.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of image processing according to an embodiment of the present invention.

FIG. 3 is a block diagram of a data processing unit according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of interpolation calculation according to an embodiment of the present invention.

FIG. 5 is an explanatory diagram of a special dot pattern according to an embodiment of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kuninori Matsumi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi Image Information Systems Co., Ltd. (72) Inventor Yoshimasa Takeuchi 4-6, Kanda Surugadai, Chiyoda-ku, Tokyo Incorporated company Hitachi

Claims (1)

[Claims] 1. In a digital convergence adjustment for eliminating color deviation among green, red and blue colors in an adjustment process of a projection television, after measuring color deviation amount at each adjustment point of three colors, correction feedback data is obtained. A digital convergence automatic adjustment device characterized by automatically adjusting writing.