JPH02216004A - Image processing method of ccd camera emitting composite synchronous signal - Google Patents

Abstract

PURPOSE:To grasp the shape of an object metrically with high accuracy by emitting a composite signal from a CCD camera to input the same to a counter part. CONSTITUTION:The clock CK signal, sample hold S/H signal and composite synchronizing Csync signal emitted from the first and second CCD cameras 2, 3 are together inputted to a buffer part 8 and subsequently inputted to the first and second camera change-over part 9. Subsequently, any changed-over signals are inputted to the first and second counter parts 10, 11. Prior to this, the Csync signal is separated into a V-signal, an H-signal and a field signal F by a sink separator 14. The counter 10 counts the number of pixels between OA of the image of a tool 13 projected on a CCD imaging device 12 and the counter 11 counts the number of pixels between AB of said image. These count numbers are measured at every interval of the signal F. Further, a display part 15 displays a reference position due to a set master and operates the shift of the max. value of the tool 13 from the reference position to display the same as an actually measured value.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an image processing system for a CCD camera that emits a composite synchronization signal that counts signals emitted from a CCD camera, calculates and analyzes the mapped shape quantitatively, and performs image analysis. This relates to a processing method.

[Conventional technology]

BACKGROUND ART CCD cameras have conventionally been used as cameras for displaying a subject on a television screen and performing image processing on the shape of the subject. A CCD camera is made up of approximately 300,000 image-capturing charge-coupled devices arranged in the shape of a matrix with 570 columns (effective) horizontally and 480 rows (effective) vertically, each of which receives light. It has the property of generating electricity. Each electrical unit is generally expressed as a pixel. A television image is generated by reproducing electrical information obtained by scanning this electrical signal as light on a television's cathode ray tube in portions corresponding to individual pixels. This television image is projected as an image, but in the CCD camera, a projected image of the subject is projected onto an imaging device consisting of the above-mentioned group of base-like images, and the part corresponding to the subject is a black base stone. The rest of the area looks like a series of white foundation stones.

Conventional technology generally uses a CCD camera having the properties described above to map an object on a monitor television and performs image analysis from this mapped shape. It had not been adopted.

[Problem to be solved by the invention]

As described above, the conventional technology has a problem in that it is insufficient in capturing the shape of one image with high precision because it performs image analysis directly from the image on the monitor television. In particular, in the prior art, there was a problem in that the mapped shape could not be analyzed with high accuracy when the object had a mapping depth and the outline was blurred.

The present invention solves the above-mentioned problems, and quantitatively measures the shape of a subject mapped on an imaging device of a CCD camera.
C that emits a composite synchronization signal that can be grasped with high precision and perform high-precision image analysis even for blurred subject images.
An object of the present invention is to provide an image processing method for a CD camera.

[Means to solve the problem]

To this end, the present invention provides pulse signals (GK) at regular intervals emitted from each of a first CCD camera with a magnification of 1 and a second CCD camera with a magnification of several times.

Composite synchronization of a sample and hold signal (S/H) for instructing recording of variable values measured at each interval, and horizontal and vertical signals for transmitting the image at the interval and the measured values of these margins. A composite synchronization signal (Csync) generated by the Csync signal is inputted to the first counter section and the second counter section via the buffer section and the separator section.
The shape of the object that is mapped onto the base eye-shaped imaging device of the D camera is counted in pixels, and this is input to the arithmetic analysis means to search for the contour shape and maximum value of the object, and to calculate the deviation of its position from the origin. The present invention is characterized by an image processing method for a CCD camera that emits a composite synchronization signal that is analyzed quantitatively.

[Effect]

The subject and the reference body are mapped by a CCD camera. C.C.
The D camera outputs a pulse signal CK, a sample hold signal (S/H), and a composite synchronization signal (Cs) at regular intervals.
ync) is generated. The composite synchronization signal includes a signal for transmitting measured values of the mapping of the subject, the reference body, and their margins.

The above GK multiplied signal S/H signal and Csync signal are
The pixels are emitted from a CCD camera and a second CCD camera, the pixels are counted through a first counter and a second counter, and these values are input to an arithmetic analysis means such as a personal computer. The arithmetic analysis means quantitatively displays the shape of the mapping from the signals inputted at regular intervals, searches for the contour shape and maximum value of the object, and analyzes the deviation of its position from the origin. A similar analysis is also performed in the case of blurred images, making it possible to accurately capture the shape of the subject.

〔Example〕

Hereinafter, a specific processing method of the present invention will be explained based on the drawings.

In this embodiment, a case will be described in which a tool mounted in the spindle of a machine tool is employed as the subject.

FIG. 1 shows a measurement flowchart.

First, after initial settings are made, the user selects whether to measure the set master or the object tool, and as a result, both are measured. The measurement is carried out using the first CCD camera and the second
This is done using a CCD camera.

Image processing, which will be described later, will be performed below.

FIG. 2(,) is a system block diagram for performing image processing in this embodiment, and FIG. 3 shows a measurement flowchart in FIG. 2.

In FIG. 2(,), the C6D camera 1 is composed of a *1 CCD camera 2 and a second CCD camera 3, and maps a projected image of the tool 4 illuminated by a light source 5. 1st CCD
The mapping of the camera 2 and the second (1, CD camera 3) is carried out via the switching unit 6, and the monitor TV and the second CCD camera 3 respectively emit a GK double signal, an S/H signal, and a C5ync signal.Here, the CK C1oc with double signal pulse signal
It is an abbreviation for k and generates pulses at regular intervals. The S/H signal is a sample hold signal.
This is an abbreviation for Ho1d, and is a signal that instructs to record the measured values of mapping at CK signal intervals at predetermined intervals. Also, the C5ync signal is a composite synchronization signal.
.

5ite Synchronizing Sign
This is an abbreviation for ``al'' and is a signal that is a feature of this embodiment. This signal is expressed by scanning the mapping with lines at predetermined intervals according to the CK interval, and includes a composite synchronization signal of the image and its margin. 1st CCD
CK greater than that emitted from camera 2 and second CCD camera 3
Both the double signal S/H signal and the C5sync signal enter a buffer section 8 which is an intermediate processing section, and then enter a switching section 9 of the first and second CCD cameras 2 and 3.

Either of the switched signals is sent to the first counter section 10.
and is input to the second counter section 11.

Before that, the C5ync signal is separated by the sync separator 14 into a (2) signal (vertical signal), an H+= signal (horizontal signal), and a field signal F.

The field signal displays every even-numbered scan and every odd-numbered scan.

The first counter 10 counts the number of pixels between OA of the mapping of the tool 13 mapped on the CCD imaging device 12 in FIG. 2(b), and the second counter 11 counts the number of pixels between OA
This is to count the number of pixels between B. This count number is measured at each field signal interval.

The display unit 15 displays the reference position determined by the set master, and also calculates the deviation of the maximum value of the tool to be measured from the reference position and displays it as an actual measurement value. Switching unit (for monitor TV) 6° display unit 15 A first counter unit 10, second counter unit 11 and ■ signal, H signal,
Field signals (F), etc. are processed by the computer 1, which is a calculation and analysis means.
All data are input to 7, and one calculation and analysis are performed.

In FIG. 3, first, a measurement instruction is given to the tool, and then, as described above, the ■ signal and the H signal are emitted from the first counter section 10. The second counter section 11 receives this.

Next, the first and second counter sections 10.11 start and then stop counting. Here, the numbers 1 to 2 are read and recorded by the S/H signal. This completes reading in one field, and if Yes, proceed to the next step, and if No, do the same thing. When the measurement of all fields is completed (Yes), the dimensions of the standard on the near scale are read. If all steps are not completed (No), return to the original state.

After reading the linear scale, calculations are performed by the personal computer 14, and then the contour shape is displayed metrically. At the same time, the maximum protrusion position of the tool is quantified, and the deviation from the reference position (origin) is calculated and displayed as an actual measurement value.

FIG. 4 shows the relationship between the tool 13 and the pixels 16 mapped on the CCD imaging device 12.

First, map the set master and set its reference etch line to
-
The intersection of the X-ray and the Z-2 line is defined as the origin of measurement.

The tool, which is the subject, is scanned at a predetermined interval at each CK signal interval, and the margin area is 0. The first counter section 10 counts the number of pixels of A, and the second counter section 11 counts the number of pixels of A1B1.
Count the number of pixels. By performing this over the entire field, the outline of the tool 13 can be represented by the number of pixels, and the display can be concretely performed. Next, find the scanning line number that has the maximum total number of O1A and +A1B. The maximum value of the tool 4 can be detected by rotating the spindle that grips the tool 4 at this position and finding this maximum value. X this position. Then, the deviation from the origin
-Xo becomes 11.4'X'N μm. N represents the number of pixels in the horizontal direction. 11.4 μm is the horizontal nominal dimension of one pixel.

Next, find < 02A 2 as shown in the figure. That is A2B
By finding the scanning line where 2 is zero, the most protruding position of the tool 4 can be found. If this is 2 degrees, the deviation from the origin Z is 2-2. is 10×nμm. Here, n is the number of pixels in the vertical direction, and 10 μm is the vertical nominal dimension of one pixel. The figure shows an image taken by the first CCD camera 1 with a magnification of 1, but in the case of the second CCD camera 2, it is magnified 10 times by the optical system, so the pixel unit is 1 μm x 1.14 μm, so it has even higher precision. The maximum value position can be found. The above values of X, Z, represent the deviation of the tool from the reference origin, and tool dimensions can be measured based on these values.

The above calculations, outline display, maximum value display, origin display, etc. are all calculated and analyzed by the personal computer 17.

FIG. 5 shows an image of the tool on the imaging device 12 with blur. A blur mapping section 18 is formed at the outer edge of the dense mapping section 13. In this case, the true shape of the tool 4 may be the contour of the blur mapping section 18 or, on the contrary, the dense mapping section 13, and it is necessary to deal with both cases. As mentioned above, the values of OA and AB are counted, but since the mapping is clearly visible in this dense mapping part, it is displayed as a signal with a relatively high number H as shown in Figure 6. Ru. On the other hand, OA' and A of the blur mapping section 18
The 'A, BB' part is displayed as a low number signal. In this case, a certain critical reference signal level h' is set,
If this signal level h' is set below the h signal level, the true shape of the tool 4 can be measured as the outline of the blur mapping section 18, and if the h' signal level is set to a value higher than the h signal, dense mapping can be performed. It can be measured as part 13. This h
By predetermining the value of ', it becomes possible to distinguish between blurred mapped areas and dense mapped areas, and the true image of the tool 4 can be accurately counted. By the processing method described above, the contour shape of the tool 4 having the blur mapping section 18 can be accurately determined.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, CC
The shape of the subject mapped on the imaging device of the D camera can be determined quantitatively and with high accuracy, and the effect of enabling highly accurate image analysis even for objects with blur can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a measurement flowchart of an embodiment of the present invention, Fig. 2 is a system block diagram of the embodiment, Fig. 3 is a measurement flowchart of Fig. 2, and Fig. 4 is measurement of a tool mapped on a CCD imaging device. Plan view for explaining the method, No. 5
The figure is a plan view for explaining a method of analyzing a blurred mapping, and FIG. 6 is a diagram showing signal strength. 1... CCD camera, 2... First CCD camera, 3... Second CCD camera, 4... Tool, 5...
...Light source, 6...Image processing switching unit, 7...Monitor television, 8...Buffer unit, 9...Switching unit, 10...First counter, 11...Second counter, 12... CCD screen, 13... dense mapping section, 14... sync separator, 15... display section, 16... pixels, 17... personal computer, 18...
Bokeh mapping section.

Claims (1)

[Claims] A pulse signal (CK) at regular intervals emitted from each of a first CCD camera with a magnification of 1 times and a second CCD camera with a magnification of several times, instructing to record the measured variable value at each interval. A sample hold signal (S/H) and a composite synchronization signal (Csync), which is generated by compositely synchronizing horizontal and vertical signals for transmitting the image and the measured values of the margins at the above-mentioned intervals, are connected to the buffer section and the separator section. The shape of the subject mapped on the base eye-shaped imaging device of the CCD camera is counted in pixels, and this is input to the arithmetic analysis means to calculate the shape of the subject. An image processing method for a CCD camera that emits a composite synchronization signal, characterized by searching for the contour shape and maximum value, and quantitatively analyzing the deviation of the position from the origin.