JPS62198272A - Borehole television camera equipment - Google Patents

Abstract

PURPOSE:To attain quick and easy investigation and analysis by photographing spirally all wall faces of desired length of a boring hole while a borehole television camera is rotated and descended and sampling an image pickup input of prescribed annular width and synthesizing the expanded picture automatically. CONSTITUTION:When the borehole television camera 2 is rotated at a constant speed by the rotation of a mirror 3, the television camera 2 is descended in the boring hole 1 at a constant speed so as not to be overlapped vertically synchronously with the rotation and the inner wall face of the boring hole 1 is spirally photographed over the length to be observed. A part of the picked-up pattern is sampled and written at each prescribed angle continuously at the same time, and an arithmetic processing circuit connects left/right/upper/ lower patterns so as not to be overlapped, the result is outputted and a consecutive expanded picture is obtained on a screen of a monitor television equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Application of the Invention) The present invention relates to a borehole television device for observing the wall surface of a cylindrical body such as a so-called borehole or various types of piping for geological surveys.

(Prior art and its problems) The conventional method is used as a means of geological investigation. That is, as shown in Figure 1, a borehole television camera (2) is placed in a polling hole (1) provided at a survey point, for example, as shown in Figure 2, a borehole television camera (2) is installed at an angle through a transparent window (2a) on the wall of the polling hole. A borehole consisting of a rotating mirror (3), its drive motor (4), an identification lamp (5), and an imaging tube (7) through which light from the mirror (3) is focused and projected via a lens (6). Hang the TV camera (2).

Then, as shown in Figure 3, the TV camera (2) is first fixed at position A, and the mirror (3) is sequentially rotated to match the width of the camera's field of view, and each time the imaging results are stored in the memory (8) in Figure 1. When the 360° circumferential imaging is completed, the camera (2) is lowered again by the vertical width of the field of view and positioned at B, and then the same operation as above is performed again. −・
The same procedure is repeated for each position, and when the required length of imaging is completed, the contents of the memory (8) in Fig. 1 are reproduced by the reproduction processing circuit (9), and the monitor television device ) is a method for investigating and solving geological structures by displaying a developed image of the wall surface on the display screen.

However, in this case, the field of view of the borehole television camera (2) is generally 2 in the vertical and horizontal directions, for example, when the inner diameter of the polling hole (1) is 76 cm, as is commonly used.
1 to 3 (J. Therefore, in order to investigate the inner wall surface of a polling hole with a length of several hundred meters or more using this conventional method, an extremely large number of imaging operations are required, and an extremely large amount of time is required for the investigation. The drawback is that it requires time and effort.

The present invention has been made for the purpose of providing a borehole television camera device capable of eliminating the above-mentioned drawbacks.The present invention will now be described in detail with reference to the drawings.

[Description of the invention]

(Means for Solving the Problems) The present invention is characterized by the following points. That is, as shown in FIG. 4, the borehole television camera (2) is rotated at a constant speed by the rotation of the mirror (3) described above in FIG. At a constant speed, move the TV camera (2) through the polling hole (1).
1, and the entire inner wall surface of the poling hole (1) is spirally imaged over the length to be observed. At the same time, as shown in Figure 5, a part of the imaged screen is continuously sampled and written to the required angular width, and then this is processed using an arithmetic processing circuit to display the left, right, top, and bottom screens as shown in Figure 6. It is characterized in that the images are connected and output so that they do not overlap, so that a continuous developed image can be obtained on the display screen of the monitor television device. For example, the following method may be used.

In other words, if we try to observe a length of 100 meters in 8 hours a day, the descending speed of the TV camera (2) will be 10,000 cm.
/ 8 hours / 60 minutes = 20.8C11/min Also, the turning speed of the TV camera (2) is 20.8cni/min / 2 cll = 11 times/min where 2crM is the field of view of the TV camera, so the TV camera ( 2) can be lowered while rotating at a speed of approximately 5.5 seconds/time, thereby making it possible to observe the desired length.

If a 12-inch monitor is used as the partial monitor TV device 00, the horizontal screen size will be 240 mm as shown in Figure 7.
1-, which almost coincides with the circumferential length of the poling hole (1) having an inner diameter of 76 cm, which is approximately 238.6 cm. Therefore, if the number of pixels in the horizontal direction is 720 pixels, the rotation of camera (2) 1
If you write to 2 pixels every time, 360' x 2 pixels = 720 pixels, so one horizontal development image will be created, but it takes about 173 seconds per frame to capture the video once. One rotation of the television camera requires 1/30 seconds x 360 degrees = 12 seconds, which does not reach the objective observation speed described above.

Therefore, if we set the sample angle width to 6'' and sample 12 pixels as shown in Figure 7, the result will be 720 pixels at a rotation speed of 60 times/min, and one horizontal development image can be created. The speed at this time is 1/30 seconds x 60 times = 2 seconds, which corresponds to 60 cffi/minute, so the observation speed is approximately tripled.

On the other hand, since the number of scanning lines of a monitor TV is 480 per frame as shown in Fig. 7, 12 pixels x 480 lines in the center of the spirally captured input screen are taken and vertically compressed to 1/8. 60 lines are synthesized in a stepwise manner. That is, when writing the input image, the camera (2) shifts it down by one line every time it rotates by 6 inches, and by making sure that the shift is exactly 60 lines per rotation, the image is written while connecting the upper and lower screens. Also, since the output screen has 480 lines in the vertical direction, 480 lines / 60 lines =
There are 8 screens, and one screen has a vertical length of 180cm for a 12-inch TV, so 180m/8 screens = 22
．． 51 m, which almost matches the vertical field of view of the television camera (2), and can display a developed image with a ratio of the actual object to the camera image of 1:1.

(Example of Implementation Apparatus) FIG. 8 is a diagram showing an example of an implementation apparatus of the present invention.
is a polling hole, (2) is a borehole television camera, (
3) is a rotating mirror, (4) is a driving monitor, (5) is a proof lamp, (6) is a lens, and (7) is an image pickup tube. This has the same effect as rotating the television camera (2) at a high speed.

θB is a 360° angle pulse generator with a mirror (3)
One pulse is sent out every time the mirror (3) rotates by 1° in synchronization with the rotation of the mirror (3). (2) is a directional pulse generator which sends out one pulse every time the television camera rotates 360°. α old depth gauge, C4) is a TV camera (
2) lifting pulley, θω is the TV camera hanging cable (including signal line), αQ is the servo motor for driving the pulley Q41, 0η is the motor driver, and this driver aη is the pulse generator αυ. In response to the output from the depth meter α as the output and feed bank signal, the servo motor Q6) is driven so as to always synchronize the rotation and descent speed of the television camera (2), as described above with reference to FIG. A television camera (2) is made to take a spiral image of the wall surface of the polling hole (1).

Next, OI is a composite circuit for developed images, of which 0ω
is the pulse generator θυ provided on the TV camera (2) side.
(2m is the input terminal for the output from the TV camera's direction pulse generator (+2+, ω1) is the video input terminal from the TV camera, @ is the analog-to-digital conversion circuit, (to) is the input terminal. Hippo Sofa Memory, Inc.
is a synchronization separation circuit, and the bad one is a sampling timing generator, and this sampling timing generator (5) is 3
60' Output P of the angle pulse generator Qll.

It receives the output P2 from the directional pulse generator (2) and the signal P4 from the synchronization separation circuit (Inc.), and generates sample number data P in synchronization with the video input P3. Further, the analog/digital conversion circuit I2 and the input buffer memory circuit (2) convert the video input P into a digital output P6 and send it out. (to) is the central processing unit, (to) is the write buffer, (to) is the address selector, (to) is the memory timing generator, (barrel is the main frame buffer memory, (31) is the parallel-series conversion circuit, (The function is the data select, (the function is the digital-to-analog conversion circuit, and the central processing unit (to) is the sampling number data output P from the sampling timing generator (5),
, a write data output P which is sampled with an angular width of, for example, 6'' upon receiving digital video input P6 from the input cover sofa memory circuit (2), and a scroll address output P.
a and CPU timing output P, and write them as parallel data to the membrane buffer memory circuit (3) through the write buffer circuit node, address selector (to), and memory timing generator, respectively. The conversion circuit (31) serially converts the memory data from the buffer memory circuit (30) and sends it out as an expanded video output PIO, and the digital-to-analog conversion circuit (33) converts the memory data from the buffer memory circuit (30) into serial data and sends it out as an expanded video output PIO.

The developed video output P is received. is converted into a digital output P, □ synchronized with the video input P3 to obtain a developed image in addition to the QOI of the monitor television device.

(Modification) Although the present invention has been described above, the following method can also be used as a method for synthesizing developed images. That is, as shown in Fig. 9(a), the descending speed for each turn of the television camera (2) is set to 1 cm, which is half of the vertical field of view 2 cffl, so that only 1 cm of the wall surface can be seen horizontally. Make it.

For example, a 12-inch monitor TV device αω as described above.
When using Figure 9 (bl (C1), the first input image is shifted from the center to 24 pixels x 240 lines in the lower half, and finally the image is shifted to 240 x 240 lines in the upper half. Then, by compressing this image to 24 pixels x 30 lines and 1/8 in the vertical direction and composing the images as shown in Figure 9 (dl), an expanded image with a ratio of the real object and camera image of approximately 1:1 is created. Also, by capturing 24 pixels from one screen, it is possible to synthesize 720 pixels on 30 screens, so the rotation speed is 30 hundred planes x 1/30 seconds = 1 second, which is twice as fast as the synthesis method described above. Since the descending speed of the TV camera can be increased to 60 cm/
You can secure the amount.

(Effects of the Invention) As described above, in the present invention, the borehole television camera descends while rotating and spirally photographs the entire wall surface of the desired length of the polling hole, and at the same time samples the imaging input over a required angular width to obtain an expanded image. Because it is automatically synthesized, investigation and analysis can be performed more quickly and easily than conventional methods, which has the excellent advantage of being able to measure the speed of various construction projects based on the investigation results. It also shows great power in observing the condition of the inner walls of piping.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the geological survey method using poling holes, Figure 2
FIG. 3 is an explanatory diagram of a borehole television camera, FIG. 3 is an explanatory diagram of an imaging method using a conventional borehole television camera, FIG. 4 is an explanatory diagram of an imaging method using a borehole television camera of the present invention, and FIGS. 5 and 6. FIG. 7 is an explanatory diagram of a developed image synthesis method, FIG. 8 is a diagram of an apparatus for implementing the present invention, and FIG. 9 is an explanatory diagram of another developed image synthesis method. (1) Polling hole, (2) Borehole television camera, (3) Rotating mirror, (4) Its drive motor, (5) Illumination lamp, (6) ...
Lens, (7)...Image tube, (9)...Memory, 0
ω...Reproduction processing circuit, aυ...3600 angle pulse generator, (2)...TV camera direction pulse generator, Q31...depth meter, αmu...lifting pulley, αω
... Suspension cable, a19... Drive servo motor, αη... Motor driver, 0 (to)... Expanded image synthesis circuit, a! ll...360°, input terminal from angle pulse generator, (2m...input terminal from direction pulse generator, Qt...video input terminal, (2)...
Analog-to-digital conversion circuit, (2)...Input cover sofa memory, Co., Ltd....Synchronization separation circuit, Error...Sampling timing generator, (To)...Central processing unit, Clause...・Write buffer, (To)...Address selector, (To)...Memory timing generator, (Bound...Main frame buffer memory, (Uniformity...Parallel/Series conversion circuit, (ra... Data selector, (uniform...digital/analog conversion circuit.

Claims (1)

[Claims] The borehole television camera is provided with a constant speed rotation device and a device that moves the borehole television camera up and down at a constant speed in synchronization with this, and is configured to spirally scan the wall surface of the cylindrical body and image the wall surface. A borehole television camera device characterized in that a circuit is provided for simultaneously sampling the image pickup output for a required width and calculating and synthesizing this as a developed image, so that a developed image of the wall surface of a cylindrical body is obtained on a monitor television device.