JPH0221791A - Convergence measuring system - Google Patents

Abstract

PURPOSE:To allow even an unskillful person to able to measure convergence easily with high accuracy by providing a color camera observing a picture and outputting red, blue and green outputs and a personal computer having a specific function. CONSTITUTION:A color camera 4 is set to a pointer of a CRT 3 desired to be measured and a cross hatch in white is displayed on the CRT 3, then the color camera 4 separates the signal into red, green and blue signals, and they are outputted to red, green and blue picture input interfaces I/F 5, 7, 9 respectively. Then the result is stored in picture memories 6, 8, 10 ass picture element data with K-gradation per one picture element whose longitudinal picture elements are (m) and whose lateral picture elements are (n). A personal computer 1 reads out a gradation data in the picture memories 6, 8, 10 as to each of mmun picture respectively, converts it into gradation for graphic display and is drawn on a corresponding coordinate addresses on the screen of the graphic monitor 2 respectively. Thus, each color radiation is made coincident by the graphic processing to measure the convergence digitally. Then the measurement is conducted visually and the convergence is easily measured by even an unskillful person with high accuracy.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a convergence measurement system that allows even beginners to easily measure convergence, which is one type of display monitor.

[Conventional technology]

FIG. 4 is an explanatory diagram of a conventional convergence measurement system. In the figure, 3 is a CRT to be measured, 31
3 is a white crosshatch pattern generated on the surface of the CRT 3, and 32 is a measuring magnifying glass. Next, the operation will be explained. There are various methods of measuring convergence using a magnifying glass or a CRT microscope, but the fourth convergence measurement method uses a magnifying glass or a CRT microscope.
This shows the case where . Figure 5 shows the principle by which convergence occurs inside the CRT3.
36 represents a focusing surface of each of the R, G, and B beams, and 38 represents a fluorescent surface. 37 is the focal plane radius. Since the radius of the fluorescent surface 38 is larger than the radius of the focusing surface 37, even if the electron beams of R, G, and B colors coincide at the CRT center section 39, the R, G, and B beams do not match at the four sides 40. Doesn't match. This amount of deviation is called misconvergence, and it is considered as one of the quality of the monitor, and must be measured accurately. In this measurement, a white crosshatch pattern 31 is generated on the screen surface of the CRT 3 as shown in FIG. 4, and the pattern is enlarged with a magnifying glass 32 for observation and measurement. As an example of this, FIG. 6 shows an enlarged view of the points of the CRT center section 39 where the convergence matches.
FIG. 7 shows an enlargement of the peripheral points that are inconsistent. Note that in FIG. 6, the shaded portions are light-emitting portions, and the white portions are non-light-emitting portions. In FIG. 7, the distance 41 is called the dot pitch and is known in advance, so using this distance 41 as a reference, the distances between the vertical and horizontal phosphors can be calculated. As for the measurement method, in order to go from the state shown in Figure 7 to the matched state shown in Figure 6, a person can confirm that if the blue light emitting part is moved by X11 inches and the red light emitting part is moved by X2 inches, the result will match. Observation and judgment are used as measured values. Note that 42 to 44 in FIG. 7 each indicate a trio of dots emitting red light.

[Problem to be solved by the invention]

Conventional convergence measurement systems are configured as described above, and while they can be easily observed by simply magnifying them with a loupe, reading them requires measuring how much of each color's emitting area has a certain spread based on a dot pinch. You have to read that each color loses if you move it.
Requires skill. In addition, in the center band of each color light-emitting area, the entire dot emits light uniformly, but in the periphery, only a part of the dot may emit light, and it is difficult to judge and read such subtle light-emitting areas. There was a problem in that measurement values varied depending on the person. This invention was made to solve the above problems.5. The purpose is to obtain a convergence measurement system that allows even beginners to easily and accurately measure.

[Means to solve the problem]

The convergence measurement system according to the present invention includes a color camera that can observe images and output red, blue, and green colors, and red and blue images captured by the color camera. This system is equipped with a personal computer capable of graphically displaying green image data in 16 gradations for red, blue, and green and scrolling the graphic screen.

[For use]

In this invention, image input data from the camera is input into a personal computer, and red and blue images are input. Green at each predetermined t'ont gradation simultaneously on the graphic monitor? In addition to displaying one image, the convergence is measured digitally by matching the light emitting parts of each color using graph ink processing.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. In Figure 1, 1 is capable of graphically displaying red (R), green (G), and blue (B) colors at 16 gradations, and has the ability to scroll each red, green, and blue graphic screen vertically and horizontally. Personal computer (hereinafter referred to as PC)
, 2 is red, green. A graphic monitor with blue analog input, 3 is a CRT as a monitor to be measured, 4 is a red, green,
Color camera capable of outputting video signals to Aokari, 5,7.9
is an image input interface (hereinafter referred to as A/D) that converts video signals of red, green, and blue colors into analog/digital (hereinafter referred to as A/D) and outputs data to image memory 6.8.10 for red, green, and blue, respectively. This is the I/F unit (hereinafter referred to as I/F). Further, 11 is a mouse for reading the coordinates of the same color phosphor trio on the graphic screen. Next, the operation will be explained. FIG. 3 is a flowchart showing the flow of operations, and the explanation will be made with reference to FIG. When you move the color camera 4 to the point you want to measure on the CRT 3 and display the white crosshatch 31 on the CRT a as shown in Figure 4, the color camera 4t
Here, an image as shown at 20 in FIG. 2 is manually created (step 5TI). The output of the color camera 4 is separated into red, green, and blue, and the image input 1/F5 is for red, green, and blue, respectively.
, 7.9 (step 5T2). These images are human-powered [/F5, 7.9, m pixels vertically, n pixels horizontally, K l per pixel! 1! Save as PI pixel data to image memory 6.8.10. 21.22.23 in FIG. 2 is an image of the contents of the image memory 6.8.10. The personal computer 1 reads the liI tone data in the image memory 6.8.10 for each m×n image, converts it into a gradation for graphic display, and sends it to the corresponding coordinate address on the screen of the graphic monitor 2. Continue drawing. In the process of step ST2, the gradation value for multi-gradation drawing of the input image data on the graphic monitor 2 is calculated as follows using (1) 2. As described above, draw at the corresponding coordinate addresses on the screen of the graphic monitor 2, and draw this on the R, G,
When the data manually entered into the computer 1 from the image memory 6.8.10 for each color is processed, the state within the field of view of the color camera 4 is displayed on the screen of the graphic monitor 2 in the form of converted gradation as shown in Figure 2. It is reproduced as shown in 24 of FIG. In detail, it is displayed as shown in Figure 7.
Here, using the mouse II, we can select a particular trio of dots that are emitting light, that is, dot trio 42 in FIG.
- 44 center coordinates are read, and the resolution of the graphic coordinates is calculated using the following equations (2) and (3) (step 5T3). X coordinate of dot trio 43 - X coordinate of dot trio 42 (2) (3) Since the graphic screen can be scrolled by R, G, and B, the keyboard or mouse 11 The user operates to scroll the R and 8 screens vertically and horizontally, centering on the 6th screen, respectively, and performs an operation such that R, G, and B match as shown in FIG. 6 (step 5T4). Once the scroll amount at this time is determined, the next step S
At T5, the amount of misconvergence between R and B with respect to G can be calculated using equations (4)2 to (7). That is, the flowchart in FIG. 3 includes step 5T.
It can be divided into five processes of I-3T5, and in the first step STI, screen data of the object to be measured by the color camera 4 is input. In the next step ST2, multi-gradation drawing of the data manually input by the personal computer 1 is performed on the graphic monitor 2. The gradation value at this time is calculated using the above equation (1). Graphic monitor 2 drawn in the next step ST3
Then, the dot trio position of the phosphor is specified using the mouse 11, and the resolution with respect to the coordinates of the graphic monitor 2 is calculated using the above equations (2) and (3). In the next step ST4, scroll operations are performed in the vertical and horizontal directions until the R, 8 screen matches the 6 screen. In the next step ST5, the amount of misconvergence is calculated using equations (4) 2 to (7) above, but this is the same as in step ST3. The resolution and scroll amount obtained in ST4 are used. In addition, in the embodiment described in (g) above, human operation was required to match R, G, and B on the screen of the graphic monitor 2, but if the display pattern is a dot pattern instead of a crosshatch, the R , G, and B, the center position of each color can be easily calculated by calculating the center of gravity, and the scroll amount can be automatically calculated and matched. Further, although a color camera 4 is used, an inexpensive black and white camera can also be used if the pattern display signal to the CRT 3 is sequentially switched between R, G, and B and the camera is manually operated each time.

【Effect of the invention】

As described above, according to the present invention, image input data from a camera is input to a personal computer, and red and blue-green are simultaneously displayed in a predetermined dot gradation on a graphic monitor.
Since the convergence is digitally measured by matching the light emitting parts of each color using graph ink processing, it can be measured visually, and even beginners can easily measure the convergence with high accuracy.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a convergence measurement system according to an embodiment of the present invention, Fig. 2 is an image diagram of image data contents for explaining the above embodiment, and Fig. 3 is an explanation of the flow of operation of the above embodiment. Flowchart for, No. 4
The figure is an explanatory diagram of the conventional convergence measurement system.
The figure is an explanatory diagram of the principle of convergence generation in a conventional CRT.
FIGS. 6 and 7 are explanatory diagrams showing enlarged convergence patterns for explaining the conventional convergence measurement system. ■ is a personal computer (PC), 2 is a graphic monitor, 3 is a CRT, 4 is a color camera, 5, 7
．． 9 is an image input interface, and 6.8.10 is an image memory. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation TewaC Amendment (voluntary)

Claims (1)

[Claims] A color camera that outputs red, green, and blue data when set at the point you want to measure on the monitor being measured and displaying a display pattern on this monitor; An image input interface for red, green, and blue that inputs data into an image memory for red, green, and blue as image data of m pixels vertically and n pixels horizontally, and a predetermined gradation per pixel. , reads out each of the m×n pixels of a predetermined gradation stored in each of the image memories, converts it into a gradation for display on a graphic monitor, and draws it at the corresponding coordinate address on the screen of this graphic monitor. Convergence measurement system equipped with a personal computer.