JP2868957B2 - Method and apparatus for photographing inside cavity - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-cavity photographing method and apparatus for photographing and recording the state of a cavity inner wall such as a boring hole.

[0002]

2. Description of the Related Art When taking a picture inside a conventional cavity, the optical axis of the camera is set parallel to the cavity axis, and a plane mirror inclined at 45 degrees to the optical axis is rotated in front of the lens of the camera. It has been practiced to photograph the entire circumference of the cavity inner wall surface as a single image. However, such a conventional technique has a problem that a rotating mechanism is required, the structure is complicated, data processing operation is complicated, and high-speed processing is required.

[0003] Therefore, recently, an intracavity photographing apparatus which obtains a continuous slice image of the inner wall surface of the cavity in advance using a conical mirror has been proposed. However, with such an in-cavity photographing apparatus, since the main focus is on creation of a developed image by side view, the visual observation function which is the original purpose of the borehole camera cannot be sufficiently exhibited,
There was a problem that it became difficult to grasp the state of the entire inner wall surface of the cavity, and it was not possible to immediately determine the state of the geology, such as the geological distribution and fracture distribution, and the state of the spring water.

In order to solve such a problem, the applicant has
In Japanese Patent Application No. 3-93148, there has been proposed an in-cavity imaging method and apparatus in which a convex mirror is disposed in front of a camera, and an image of a substantially cylindrical inner wall surface having a predetermined width is projected on the convex mirror. There, a through-hole is provided in the central portion of the convex mirror, and when obtaining a forward-view image, a camera is advanced into the through-hole, an image of the front inner wall surface is captured in a forward view, and a side-view image is obtained. Also disclosed is a configuration in which the camera is retracted to obtain a side view image of the inner wall surface reflected on the mirror surface with the mirror surface of the convex mirror set in the field of view when the camera is retracted.

[0005]

[Problems to be solved by the invention]
According to No. 3148, it is possible to obtain a side view image and a forward view image of the inner wall surface, but to obtain both images with a common camera, the relative position of the convex mirror and the camera is changed. It is necessary to obtain both images, which is troublesome, and it requires a precise drive mechanism to change the relative position, and is susceptible to equipment durability issues and the adverse effects of the workplace atmosphere. There was a problem.

[0006] The present invention has been made in view of the above points, and an object of the present invention is to simultaneously capture a side view image of a surrounding inner wall surface and a front view image in front. An object of the present invention is to provide an intra-cavity imaging method and an intra-cavity imaging apparatus.

[0007]

According to a first aspect of the present invention, there is provided a method for photographing inside a cavity, wherein a center axis of a bottomless cylindrical inner mirror having a mirror surface formed on an inner surface thereof is aligned with an optical axis of a camera. In the mirror,
A side view image of the cavity inner wall surface slightly in front thereof is projected, and the camera simultaneously shoots a forward view image passing through the inner space of the inner mirror and a side view image reflected on the inner mirror. It was configured as follows.

According to a second aspect of the present invention, there is provided an in-cavity photographing apparatus, wherein a bottomless cylindrical inner mirror having a mirror surface formed on an inner surface, a side view image of the inner wall surface of the cavity reflected on the inner mirror, and an inner space of the inner mirror And a camera arranged with the optical axis aligned with the central axis of the internal mirror so as to simultaneously capture a forward-looking image through the section.

[0009]

According to the inside cavity imaging method of the present invention, the center axis of the bottomless cylindrical inner mirror having a mirror surface formed on the inner surface is arranged in accordance with the optical axis of the camera. A side view image of a substantially cylindrical inner wall surface having a predetermined width slightly ahead of the cavity is shown. Therefore, when photographing is performed by the camera, a forward view image passing through the inner space of the inner mirror and a side view image reflected on the inner mirror are simultaneously captured.

According to the in-cavity photographing apparatus of the present invention, the side view image reflected on the endoscope and the forward view image directly photographed can be simultaneously photographed by one camera. It is also possible to quickly grasp the situation of the entire inner wall surface and the state of spring water.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. In FIG. 1, a head part A of the in-cavity photographing apparatus of the present invention is configured such that a small camera 2 is housed in a cylindrical case 1 and an inner mirror 3 is attached to a tip end surface of the case 1.

The inner mirror 3 is an inner mirror having a camera 2 side as a bottom side and a curved inner surface corresponding to a side surface of a truncated cone having the front as a vertex. There is no bottomless truncated cone, the inner space is transparent,
The camera 2 is configured so as to be able to photograph a forward-looking image while seeing it through.

The camera 2 has a wide-angle adapter 21 for widening the field of view so that an image can be taken up to the inner mirror 3, and a CCD.
A camera head 22 having an image sensor is provided. Image data is transmitted to a cable 24 via a connector 23 and input to a recording device and an image processing device. In order to prevent infiltration of moisture into the outer case 12, a water stopping structure 25 including a water stopping cone and a water stopping ring is provided.

An acrylic window 31 is formed at the front of the inner mirror 3, and an illumination lamp 32 and an illumination window 33 for dispersing light are arranged outside. The case 1 is composed of an inner case 11 containing the above-mentioned camera relationship and an outer case 12 fitted on the inner case 11. The outer case 12 is connected and fixed to the U-shaped rod 6 via the offset coupling 5.

As shown in FIG. 2, six illumination lamps 32 are provided.
Are arranged at intervals of 60 degrees to make the inner wall surface bright, and the illumination window 33 scatters light so that a shadow is hardly formed on an image.

In FIG. 3, assuming that an image forming position is a point C, the range of the side view image S reflected by the internal mirror 3 and taken by the camera 2 is the width from the position B1 to the position B2 of the inner wall surface of the cavity. Is a cylindrical part. The range of the forward-view image F is an image ahead of the position B3. Therefore, the image obtained at the point C is obtained in a state where the front-view image F and the side-view image S are integrated as shown in FIG.

Since the lower positions B1 and B2 in front of the photographing device are reflected on the upper part of the inner mirror 3, they appear in the upper positions B1 'and B2' on the screen in the image of FIG.

Since the lower position B3 in front of the photographing device is not directly reflected on the inner mirror 3 but is directly photographed by the camera 2, it appears at the lower position B3 'on the screen in the image of FIG. The overall state inside the cavity is observed with the forward-view image F obtained in this way, and with the side-view image S,
The state of the inner wall of the cavity at a position slightly in front of the inner mirror 3 can be observed in detail.

The combined image of the forward-view image F and the side-view image S obtained by the camera 2 is input to the image processing means 4.

As shown in FIG. 6, the image processing means 4 is configured to input an image from the small camera 2 to an input image monitor 41 and an input image memory 43 of an image developing device 42. Reference numeral 44 denotes a reproducing device, and reference numeral 45 denotes a developed image storage device. 46 is a developed image memory, and 47 is a developed image monitor.

The intracavity photographing apparatus configured as described above photographs the inside of the cavity as follows. That is, the head part A of the intracavity photographing device is inserted into the cavity such that the optical axis of the camera 2 is parallel to the cavity axis. Then, as shown in FIG. 4, the front view image F and the side view image S are photographed and displayed on the monitor 41.

Description of the Screen In the forward view image F of FIG. 4 projected on the monitor 41, a is a crack, B is spring water, and C is a state of spring water flowing through the bottom of the cavity. The forward-looking image F allows the general understanding of the geological state such as the geological distribution and the distribution of the fractures i, the state of spring water, and the like, and also makes it easy to find pebbles and steps, and these are preliminarily obtained. Can be avoided.

In the side view image S shown in FIG. 4, a developed image is used in order to investigate the location checked in the forward view television image in detail and accurately.

The image processing means 4 develops a concentric side view image S of the peripheral portion of the image on the internal mirror 3 into a planar image and develops the image into a plane image. (E.g., 5 mm) Each time the vehicle advances, a plurality of side-view images S are obtained, and in all the side-view images S, annular images having the same radius are developed into linear images, respectively. Are sequentially arranged to output a developed image developed on a plane.

That is, the side view image of the entire circumference of the inner wall surface of the cavity is photographed through the inner mirror 3, and is recorded in a deformed donut shape around the circular image. This image is first digitized and taken into an input image memory as an electric luminance signal of each pixel, and is taken along a circumference (a to b) of a certain radius with a certain position (for example, downward) as a reference point. The signals of the pixels located on the circumference are taken out and arranged on a development memory as an image signal of one unit row,
The developed images (a and b) for one line are obtained. This process is performed every time the image is taken while moving on the side wall surface by a certain unit distance, and the image signals of the unit rows are arranged in the column direction at a certain distance on the expansion memory to obtain an expanded image. Then, the developed image memory 4
The image No. 6 is recorded and stored in the developed image storage device 45.

The details of the image development processing are omitted because they are based on the contents described in Japanese Patent Application No. 3-93148.

[0027]

As is apparent from the above description, according to the method for photographing inside a cavity according to the present invention, the side of the inside wall surface of the cavity, which can accurately grasp the geological state such as the distribution of geology and the distribution of cracks on the inside wall surface of the cavity. At the same time, the aerial image and the forward-looking image that can visually grasp the inner surface of the cavity in front of the camera and visually understand the geological state such as geological distribution and fracture distribution and the state of spring water, The effect of being able to take a picture is obtained.

According to the in-cavity photographing apparatus of the present invention, the above-mentioned effects can be obtained, and it is not necessary to move the camera in the photographing apparatus, so that a highly reliable photographing apparatus can be provided. Become.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a camera head portion of an image photographing apparatus according to the present invention.

FIG. 2 is a sectional view taken along line XX of the camera head portion.

FIG. 3 is a principle explanatory diagram for explaining a basic principle of the present invention.

FIG. 4 is an example of an image in which a forward-view image and a side-view image obtained by the present imaging method are continuous.

FIG. 5 is a diagram illustrating the principle of developed image processing in the embodiment.

FIG. 6 is a block diagram showing a configuration of a reproduction device, an image development device, a developed image recording device, an input image monitor, and a developed image monitor of the present invention.

[Explanation of symbols]

 2 ・ ・ ・ Camera 3 ・ ・ ・ Internal mirror 4 ・ ・ ・ Image processing means

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shunichi Kamewada Reaks Co., Ltd. (56) References JP-A-4-161693 (JP, A) Hei 1-90001 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01C 7/00-7/06 E21B 47/00-47/01 G01C 11/00-11/34 G02B 23/24

Claims (2)

(57) [Claims] A bottomless cylindrical inner mirror having a mirror surface formed on an inner surface thereof is disposed in a cavity with its center axis aligned with the optical axis of a camera. A side view image of a wall surface is projected, and the camera is configured to simultaneously shoot a forward view image passing through the inner space of the inner mirror and a side view image reflected on the inner mirror. The method of shooting inside the cavity. 2. A bottomless cylindrical inner mirror having a mirror surface formed on an inner surface, a side view image of a substantially cylindrical inner wall surface of a predetermined width of a cavity reflected on the inner mirror, and an inner space of the inner mirror. A camera disposed so that an optical axis is aligned with a center axis of the internal mirror so as to simultaneously capture a forward-looking image passing through the inside of the cavity.