CA2255820A1 - Bored wall surface observation apparatus - Google Patents
Bored wall surface observation apparatus Download PDFInfo
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- CA2255820A1 CA2255820A1 CA002255820A CA2255820A CA2255820A1 CA 2255820 A1 CA2255820 A1 CA 2255820A1 CA 002255820 A CA002255820 A CA 002255820A CA 2255820 A CA2255820 A CA 2255820A CA 2255820 A1 CA2255820 A1 CA 2255820A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Closed-Circuit Television Systems (AREA)
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
- Image Processing (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
An apparatus for displaying an all-around development image of a bored wall surface not only by a still image but also by a dynamic image by carrying out coordinate transformation at a high speed when the wall surface of a hole made by boring or a hole through which underground water flows is photographed and then developed into an all-around image. The digitalized image data are stored in each frame of an image memory by a memory data controller, and the data in odd-number fields and even-number fields of the image memory are read out alternately many times at a rate of 60 fields per second by a read memory address controller in accordance with vertical and horizontal synchronizing signals. During this time, the image data are read spirally by controlling a coordinate transformation table with reference to the directional data on the photographed image outputted from a direction indicator. The image data developed into a square diagram are converted into analog signals by a D/A
converter, and picture signals are outputted through a RGB matrix circuit.
converter, and picture signals are outputted through a RGB matrix circuit.
Description
CA 022~820 1998-11-19 SPECIFICATION
Hole Wall Surface Observing Apparatus Technical Field:
The nature of the soil must be studied in the area in which a dam or an underground cavity is being built or made. A required study can be performed by boring a hole in such a dam site for the purpose. The present invention relates to a hole wall surface observing apparatus for taking a 360 degree-wide picture of the surrounding wall surface of the underground-bored hole or sewerage passage.
Background Art:
The bored hole or sewerage passage under the ground is often affected adversely by the land depression or land pressure, so that the hollow surface is cracked, thereby allowing water to invade in the underground hole or ooze out into the soil.
The observing and locating of such cracks appearing in the inner surface of the bored hole or sewerage passage under the ground is, therefore, of great concern. A conventional observing apparatus, however, provide required data in the form of still image, and therefore, it is difficult to locate the place where water appears in the inner surface of the hole.
One object of the present invention is to provide a hole wall surface observing apparatus which is capable of: taking a 360 degree-wide picture of the inner surface of a bored hole or sewerage passage under the ground;
and performing a quick coordinate transformation, thereby providing not only still images but also moving images to facilitate the observation and location of water invasions in the inner surface of the hole by sight.
Disclosure of Invention:
A hole wall surface observing apparatus according to the present invention comprises:
an illuminating unit for throwing light to the inner surface of a .
CA 022~820 1998-11-19 bored hole in all directions;
a video camera equipped with wide-angle picture taking means for taking 360 degree-wide pictures of the hollow surface from a single point of view at one time;
a direction finder for determining the direction in which the video camera is directed and for outputting a signal representing the so determined direction;
an image-data memory for analogue-to-digital converting 360 degree-wide picture signals taken by the video camera and for storing the so converted signals for each frame;
image data reading means for retrieving 360 degree-wide picture data spirally from the image-data memory for each frame while referring to the directional data supplied from the direction finder;
image data expanding means for transforming the 360 degree-wide picture data into expanded picture data for each field by referring to the coordinate transformation table; and moving-image display means for digital-to-analogue converting the expanded picture data for each field and for outputting signals representing moving images, whereby the 360 degree-wide pictures taken by the video camera may be converted to the expanded images to display moving images of the inner surface of the bored hole.
Brief Description of Drawings:
Fig.1 illustrates how a hole wall surface observing apparatus according to the present invention is used:
Fig.2 shows the inner structure of the probe;
Fig.3 shows one example of the picture of the surrounding wall surface of the hole;
Fig.4 illustrates how light may be reflected by a frustoconical mirror;
Fig.S illustrates how light may fall on a wide-angle lens in taking a picture of the inner surface of a bored hole;
CA 022~820 1998-11-19 Fig.6 shows a block diagram of image-processing system;
Fig.7 shows how the hollow surface image is digitized;
Fig.8 shows how interlacing-and-sweeping can be effected; and Fig.9 shows a 360 degree-wide expansion of the hollow surface image .
Best Mode of Carrying out the Invention:
Referring to the drawings, particularly to Fig.1, a hole wall surface observing apparatus according to the present invention is shown as descending its probe 1 in a vertical hole or shaft bored in the ground.
The probe 1 is suspended from an elongated wire 2, which is wound and rewound by a winch 3. An elongated cable 4 extends from the probe 1 to a processing unit 5 for processing the data transmitted thereto via the cable 4. The so processed data is displayed on a TV screen 6. The image data processed in the processor 5 are stored in a memory 7.
Referring to Fig.2, the probe 1 comprises a video camera 11 which can take a 360 degree-wide picture of the inner surface of the hole, a control 12 connected to the video camera 11 for controlling the same, a direction finder 13 mounted on the video camera 11 to determine in which direction the video camera 11 is directed to take a picture, an illuminating lamp 14 mounted on the video camera 11 for illuminating the surrounding hollow surface, and a frustoconical mirror 15 positioned on the optical axis of the video camera for providing a 360 degree-wide reflection of the surrounding hollow surface, which is illuminated by the lamp 14.
The hole wall surface observing apparatus has the so constructed probe 1 suspended in the bored hole under the ground while illuminating the surrounding hollow wall in all directions.
Thus, a 360 degree-wide, annular (or ring-like) reflection appears on the frustoconical mirror 15 (see Fig.3), which reflection is taken by the video camera 1.
In Fig.3 oblique cracks are indicated by "a"; horizontal cracks are indicated by "b"; and vertical cracks are indicated by "c".
CA 022~820 1998-11-19 The 360 degree-wide, annular image reflection appearing on the frustoconical mirror 15 looks like being swallowed toward the center of the image while the probe 1 is descending.
Referring to Fig.4, the frustoconical mirror 15 is inclined at the angle of 45 degrees in its circumference, thereby permitting light beams to be reflected and projected in the direction perpendicular to the incident direction, thus falling on the lens of the video camera 1.
Thus, the video camera 11 can take 360 degree-wide pictures of the surrounding hollow surface (vertical range indicated by "r" in Fig.4) from a single point of view at one time.
Alternatively, a wide-angle camera L may be used in place of the frustoconical mirror for taking 360 degree-wide pictures of the surrounding hollow surface from a single point of view. In this case the vertical range of the 360 degree-wide picture taken is indicated by "r" in Fig.S .
Referring to Fig.6, the processing apparatus 5 for processing video signals representing image data from the probe 1 comprises a decoder 51, an analogue-to-digital converter 52, a data-writing control 53, a pixel memory 54, a data addressing control 55, a coordinate transformation table 56, a digital-to-analogue converter 57 and an RGB matrix circuit 58.
The RGB decoder 51 is responsive to receipt of video signals from the video camera 11 for resolving each video signal into R, G and B
component signals, and then, these R, G and B component signals are converted to corresponding digital image data by the analogue-to-digital converter 52.
The digital image data are stored in the pixel memory 54 as a collection of pixels for each frame (see Fig.7).
An NTSC system permits transmission per second of sixty fields each composed of 262.5 scanning lines, and it works in interlacing mode in which scanning lines for first and second fields are interlaced with each other.
As shown in Fig.8, the field of an odd number (left side) and the CA 022~820 1998-11-19 field of a round number (right side) are combined to provide a single frame of 525 scanning lines.
Specifically 262.5 scanning lines are used in 1/60 seconds, and then, another 262.5 scanning lines are used in 1/60 seconds, providing a complete picture (or frame) of 525 scanning lines.
Every time the pixel memory 54 has stored image data sufficient enough to compose a single field, the contents of the pixel memory 54 are read out in synchronism with the vertical and horizontal synchronous signals under the control of the data addressing control 55, and this is repeated 60 times per second to provide data of odd- and round-numbered fields alternately.
The retrieval of image data from the pixel memory 54 is effected every 1/30 seconds prior to renewal of the current frame by the sequential frame .
The retrieval of image data from the pixel memory 54 is effected spirally under the control of the coordinate transformation table 56 while referring to the directional data outputted from the direction finder 13.
The spiral retrieval is required because of the inclining of the scanning lines on the TV screen as shown in Fig.8.
Display on the TV screen is permitted by retrieving image data to be in conformity with the inclination of the scanning lines, thus compensating for positional deviations which otherwise, would be caused in displaying on the TV screen. Thus, a picture of high fidelity results.
The image of the surrounding hollow surface produced by spiral retrieval, however, is like a trapezoid in its contour because of different lengths of the upper and lower circumferences, but such trapezoid contour can be converted into a rectangular shape as shown in Fig.9 by effecting a required modification on the coordinate transformation table simultaneously with retrieval of image data.
The rectangular-expanded image data are converted to analogue signals by the digital-to-analogue converter 57 to provide image signals at the output terminals of the RGB matrix circuit 58.
CA 022~820 1998-11-19 As the probe 1 is descending at a fixed speed in the shaft, the frustoconical mirror 15 changes in position accordingly. The 360 degree-wide reflection of the surrounding hollow surface appearing on the frustoconical mirror 15 is processed at an increased speed to display the processed and coordinate-transformed frames one after another, resulting in moving pictures of the surrounding hollow surface without intermission.
It is desired that a three-dimensional moving picture rather than two-dimensional one be displayed.
One example of providing such a three-dimensional moving picture of surrounding hollow surface is described below.
In this example a single video camera is moved to manufacture a three-dimensional moving picture of surrounding hollow surface from those pictures taken at two different positions of pre- and post-movements.
Every time the video camera 11 is moved a given constant distance (for example, 1 millimeter long), image data is stored in the pixel memory 54 in the form of pixel collection as shown in Fig.7. The movement of the video camera 11 is measured by a rotary encoder (not shown) mounted on the winch 3. The data-writing control 53 is permitted to control the pixel memory 54 by using pulse signals from the rotary encoder as trigger pulses, so that image data may be stored in the pixel memory 54 at controlled time.
The pixel memory 54 stores all image data provided while the video camera 11 is moved the eye-to-eye distance. Assuming that the eye-to-eye distance is 65 millimeters long, image data of one frame are stored every time the video camera 11 is moved 1 millimeter, so that image data of at least 65 frames are stored.
The memory data control 53 controls the pixel memory 54 so that a predetermined amount of data may be stored, and so that the previous data may be replaced frame by frame by the new data every time the video camera 11 is moved step by step. Thus, the additional, newest image data is located the eye-to-eye distance apart from the oldest image data all the time.
... ..
CA 022=,=,820 1998-11-19 The image data stored in the pixel memory 54 are read out 60 times per second in synchronism with the vertical and horizontal synchronous signals, providing odd- and round-numbered fields alternately, as is the case with the embodiment described above.
In retrieving image data from the pixel memory 54 addresses for retrieval are alternately selected between those for additional or newest image data and oldest image data to provide additional or newest image data and oldest image data in combination. The so selected data are outputted alternately in time-shared way.
The parallax caused by the eye-to-eye distance can be controlled by appropriately changing addresses for retrieval.
In case that the video camera 11 moves vertically in the bored shaft in the ground the newest picture in the pixel memory 54 is rotated 90 degrees apart from the oldest picture to provide left and right pictures to combine in human brain, thereby providing a composite stereographic image .
As is known, a three-dimensional or stereographic picture can be provided by showing the left and right two-dimensional pictures simultaneously, each two-dimensional picture showing one and same sight as seen from different positions, which are the eye-to-eye distance apart from each other.
In general, two CRTs or liquid crystal displays are used, each showing simultaneously one and same sight as seen from two different positions, which are the eye-to-eye distance apart from each other.
As is well known, three-dimensional or stereographic images can be produced by showing alternately left and right parallactic images at every 100 or less millisecond-long intervals rather than simultaneously.
The NTSC system presents 60 images per second, and therefore, each image is produced every 16.7 milliseconds. Therefore, the three-dimensional or stereographic images can be provided by alternately showing left and right parallactic images on a TV screen in time-shared fashion and by using a pair of glasses which can be alternately shuttered CA 022~820 1998-11-19 in synchronism with alternate appearance of the left and right parallactic images on the TV screen.
Alternatively complementary color glasses or polarization glasses may be used in separately observing left and right parallactic images on a TV screen.
Three-dimensional or stereographic images of 360 degree-wide hollow surfaces when presented, facilitates the observing of the surrounding hollow surface as such images are vivid and deep, compared with two-dimensional images, and the sight of such cracks as would be hardly discernible from two-dimensional images can be located easily.
Utilization in Industry:
A hole wall surface observing apparatus according to the present invention can be used in observing the inner surface of a bored hole or shaft by taking 360 degree-wide pictures of the hollow surface and by effecting a quick coordinal-transformation on the pictures to provide still or moving 360 degree-wide pictures.
The spiral retrieval of image data in compliance with the inclination of scanning lines on a TV screen permits presentation of distortion-free images at high-fidelity.
Thus, the time-varying water invasion can be located exactly on the screen.
Hole Wall Surface Observing Apparatus Technical Field:
The nature of the soil must be studied in the area in which a dam or an underground cavity is being built or made. A required study can be performed by boring a hole in such a dam site for the purpose. The present invention relates to a hole wall surface observing apparatus for taking a 360 degree-wide picture of the surrounding wall surface of the underground-bored hole or sewerage passage.
Background Art:
The bored hole or sewerage passage under the ground is often affected adversely by the land depression or land pressure, so that the hollow surface is cracked, thereby allowing water to invade in the underground hole or ooze out into the soil.
The observing and locating of such cracks appearing in the inner surface of the bored hole or sewerage passage under the ground is, therefore, of great concern. A conventional observing apparatus, however, provide required data in the form of still image, and therefore, it is difficult to locate the place where water appears in the inner surface of the hole.
One object of the present invention is to provide a hole wall surface observing apparatus which is capable of: taking a 360 degree-wide picture of the inner surface of a bored hole or sewerage passage under the ground;
and performing a quick coordinate transformation, thereby providing not only still images but also moving images to facilitate the observation and location of water invasions in the inner surface of the hole by sight.
Disclosure of Invention:
A hole wall surface observing apparatus according to the present invention comprises:
an illuminating unit for throwing light to the inner surface of a .
CA 022~820 1998-11-19 bored hole in all directions;
a video camera equipped with wide-angle picture taking means for taking 360 degree-wide pictures of the hollow surface from a single point of view at one time;
a direction finder for determining the direction in which the video camera is directed and for outputting a signal representing the so determined direction;
an image-data memory for analogue-to-digital converting 360 degree-wide picture signals taken by the video camera and for storing the so converted signals for each frame;
image data reading means for retrieving 360 degree-wide picture data spirally from the image-data memory for each frame while referring to the directional data supplied from the direction finder;
image data expanding means for transforming the 360 degree-wide picture data into expanded picture data for each field by referring to the coordinate transformation table; and moving-image display means for digital-to-analogue converting the expanded picture data for each field and for outputting signals representing moving images, whereby the 360 degree-wide pictures taken by the video camera may be converted to the expanded images to display moving images of the inner surface of the bored hole.
Brief Description of Drawings:
Fig.1 illustrates how a hole wall surface observing apparatus according to the present invention is used:
Fig.2 shows the inner structure of the probe;
Fig.3 shows one example of the picture of the surrounding wall surface of the hole;
Fig.4 illustrates how light may be reflected by a frustoconical mirror;
Fig.S illustrates how light may fall on a wide-angle lens in taking a picture of the inner surface of a bored hole;
CA 022~820 1998-11-19 Fig.6 shows a block diagram of image-processing system;
Fig.7 shows how the hollow surface image is digitized;
Fig.8 shows how interlacing-and-sweeping can be effected; and Fig.9 shows a 360 degree-wide expansion of the hollow surface image .
Best Mode of Carrying out the Invention:
Referring to the drawings, particularly to Fig.1, a hole wall surface observing apparatus according to the present invention is shown as descending its probe 1 in a vertical hole or shaft bored in the ground.
The probe 1 is suspended from an elongated wire 2, which is wound and rewound by a winch 3. An elongated cable 4 extends from the probe 1 to a processing unit 5 for processing the data transmitted thereto via the cable 4. The so processed data is displayed on a TV screen 6. The image data processed in the processor 5 are stored in a memory 7.
Referring to Fig.2, the probe 1 comprises a video camera 11 which can take a 360 degree-wide picture of the inner surface of the hole, a control 12 connected to the video camera 11 for controlling the same, a direction finder 13 mounted on the video camera 11 to determine in which direction the video camera 11 is directed to take a picture, an illuminating lamp 14 mounted on the video camera 11 for illuminating the surrounding hollow surface, and a frustoconical mirror 15 positioned on the optical axis of the video camera for providing a 360 degree-wide reflection of the surrounding hollow surface, which is illuminated by the lamp 14.
The hole wall surface observing apparatus has the so constructed probe 1 suspended in the bored hole under the ground while illuminating the surrounding hollow wall in all directions.
Thus, a 360 degree-wide, annular (or ring-like) reflection appears on the frustoconical mirror 15 (see Fig.3), which reflection is taken by the video camera 1.
In Fig.3 oblique cracks are indicated by "a"; horizontal cracks are indicated by "b"; and vertical cracks are indicated by "c".
CA 022~820 1998-11-19 The 360 degree-wide, annular image reflection appearing on the frustoconical mirror 15 looks like being swallowed toward the center of the image while the probe 1 is descending.
Referring to Fig.4, the frustoconical mirror 15 is inclined at the angle of 45 degrees in its circumference, thereby permitting light beams to be reflected and projected in the direction perpendicular to the incident direction, thus falling on the lens of the video camera 1.
Thus, the video camera 11 can take 360 degree-wide pictures of the surrounding hollow surface (vertical range indicated by "r" in Fig.4) from a single point of view at one time.
Alternatively, a wide-angle camera L may be used in place of the frustoconical mirror for taking 360 degree-wide pictures of the surrounding hollow surface from a single point of view. In this case the vertical range of the 360 degree-wide picture taken is indicated by "r" in Fig.S .
Referring to Fig.6, the processing apparatus 5 for processing video signals representing image data from the probe 1 comprises a decoder 51, an analogue-to-digital converter 52, a data-writing control 53, a pixel memory 54, a data addressing control 55, a coordinate transformation table 56, a digital-to-analogue converter 57 and an RGB matrix circuit 58.
The RGB decoder 51 is responsive to receipt of video signals from the video camera 11 for resolving each video signal into R, G and B
component signals, and then, these R, G and B component signals are converted to corresponding digital image data by the analogue-to-digital converter 52.
The digital image data are stored in the pixel memory 54 as a collection of pixels for each frame (see Fig.7).
An NTSC system permits transmission per second of sixty fields each composed of 262.5 scanning lines, and it works in interlacing mode in which scanning lines for first and second fields are interlaced with each other.
As shown in Fig.8, the field of an odd number (left side) and the CA 022~820 1998-11-19 field of a round number (right side) are combined to provide a single frame of 525 scanning lines.
Specifically 262.5 scanning lines are used in 1/60 seconds, and then, another 262.5 scanning lines are used in 1/60 seconds, providing a complete picture (or frame) of 525 scanning lines.
Every time the pixel memory 54 has stored image data sufficient enough to compose a single field, the contents of the pixel memory 54 are read out in synchronism with the vertical and horizontal synchronous signals under the control of the data addressing control 55, and this is repeated 60 times per second to provide data of odd- and round-numbered fields alternately.
The retrieval of image data from the pixel memory 54 is effected every 1/30 seconds prior to renewal of the current frame by the sequential frame .
The retrieval of image data from the pixel memory 54 is effected spirally under the control of the coordinate transformation table 56 while referring to the directional data outputted from the direction finder 13.
The spiral retrieval is required because of the inclining of the scanning lines on the TV screen as shown in Fig.8.
Display on the TV screen is permitted by retrieving image data to be in conformity with the inclination of the scanning lines, thus compensating for positional deviations which otherwise, would be caused in displaying on the TV screen. Thus, a picture of high fidelity results.
The image of the surrounding hollow surface produced by spiral retrieval, however, is like a trapezoid in its contour because of different lengths of the upper and lower circumferences, but such trapezoid contour can be converted into a rectangular shape as shown in Fig.9 by effecting a required modification on the coordinate transformation table simultaneously with retrieval of image data.
The rectangular-expanded image data are converted to analogue signals by the digital-to-analogue converter 57 to provide image signals at the output terminals of the RGB matrix circuit 58.
CA 022~820 1998-11-19 As the probe 1 is descending at a fixed speed in the shaft, the frustoconical mirror 15 changes in position accordingly. The 360 degree-wide reflection of the surrounding hollow surface appearing on the frustoconical mirror 15 is processed at an increased speed to display the processed and coordinate-transformed frames one after another, resulting in moving pictures of the surrounding hollow surface without intermission.
It is desired that a three-dimensional moving picture rather than two-dimensional one be displayed.
One example of providing such a three-dimensional moving picture of surrounding hollow surface is described below.
In this example a single video camera is moved to manufacture a three-dimensional moving picture of surrounding hollow surface from those pictures taken at two different positions of pre- and post-movements.
Every time the video camera 11 is moved a given constant distance (for example, 1 millimeter long), image data is stored in the pixel memory 54 in the form of pixel collection as shown in Fig.7. The movement of the video camera 11 is measured by a rotary encoder (not shown) mounted on the winch 3. The data-writing control 53 is permitted to control the pixel memory 54 by using pulse signals from the rotary encoder as trigger pulses, so that image data may be stored in the pixel memory 54 at controlled time.
The pixel memory 54 stores all image data provided while the video camera 11 is moved the eye-to-eye distance. Assuming that the eye-to-eye distance is 65 millimeters long, image data of one frame are stored every time the video camera 11 is moved 1 millimeter, so that image data of at least 65 frames are stored.
The memory data control 53 controls the pixel memory 54 so that a predetermined amount of data may be stored, and so that the previous data may be replaced frame by frame by the new data every time the video camera 11 is moved step by step. Thus, the additional, newest image data is located the eye-to-eye distance apart from the oldest image data all the time.
... ..
CA 022=,=,820 1998-11-19 The image data stored in the pixel memory 54 are read out 60 times per second in synchronism with the vertical and horizontal synchronous signals, providing odd- and round-numbered fields alternately, as is the case with the embodiment described above.
In retrieving image data from the pixel memory 54 addresses for retrieval are alternately selected between those for additional or newest image data and oldest image data to provide additional or newest image data and oldest image data in combination. The so selected data are outputted alternately in time-shared way.
The parallax caused by the eye-to-eye distance can be controlled by appropriately changing addresses for retrieval.
In case that the video camera 11 moves vertically in the bored shaft in the ground the newest picture in the pixel memory 54 is rotated 90 degrees apart from the oldest picture to provide left and right pictures to combine in human brain, thereby providing a composite stereographic image .
As is known, a three-dimensional or stereographic picture can be provided by showing the left and right two-dimensional pictures simultaneously, each two-dimensional picture showing one and same sight as seen from different positions, which are the eye-to-eye distance apart from each other.
In general, two CRTs or liquid crystal displays are used, each showing simultaneously one and same sight as seen from two different positions, which are the eye-to-eye distance apart from each other.
As is well known, three-dimensional or stereographic images can be produced by showing alternately left and right parallactic images at every 100 or less millisecond-long intervals rather than simultaneously.
The NTSC system presents 60 images per second, and therefore, each image is produced every 16.7 milliseconds. Therefore, the three-dimensional or stereographic images can be provided by alternately showing left and right parallactic images on a TV screen in time-shared fashion and by using a pair of glasses which can be alternately shuttered CA 022~820 1998-11-19 in synchronism with alternate appearance of the left and right parallactic images on the TV screen.
Alternatively complementary color glasses or polarization glasses may be used in separately observing left and right parallactic images on a TV screen.
Three-dimensional or stereographic images of 360 degree-wide hollow surfaces when presented, facilitates the observing of the surrounding hollow surface as such images are vivid and deep, compared with two-dimensional images, and the sight of such cracks as would be hardly discernible from two-dimensional images can be located easily.
Utilization in Industry:
A hole wall surface observing apparatus according to the present invention can be used in observing the inner surface of a bored hole or shaft by taking 360 degree-wide pictures of the hollow surface and by effecting a quick coordinal-transformation on the pictures to provide still or moving 360 degree-wide pictures.
The spiral retrieval of image data in compliance with the inclination of scanning lines on a TV screen permits presentation of distortion-free images at high-fidelity.
Thus, the time-varying water invasion can be located exactly on the screen.
Claims (2)
1. A hole wall surface observing apparatus comprising:
an illuminating unit for throwing light to the inner surface of a bored hole in all directions;
a video camera equipped with wide-angle picture taking means for taking 360 degree-wide pictures of the hollow surface from a single point of view at one time;
a direction finder for determining the direction in which the video camera is directed and for outputting a signal representing the so determined direction;
an image-data memory for analogue-to-digital converting 360 degree-wide picture signals taken by the video camera and for storing the so converted signals for each frame;
image data reading means for retrieving 360 degree-wide picture data spirally from the image-data memory for each frame while referring to the directional data supplied from the direction finder;
image data expanding means for transforming the 360 degree-wide picture data into expanded picture data for each field by referring to the coordinate transformation table; and moving-image display means for digital-to-analogue converting the expanded picture data for each field and for outputting signals representing moving images, whereby the 360 degree-wide pictures taken by the video camera may be converted to the expanded images to display moving images of the inner surface of the bored hole.
an illuminating unit for throwing light to the inner surface of a bored hole in all directions;
a video camera equipped with wide-angle picture taking means for taking 360 degree-wide pictures of the hollow surface from a single point of view at one time;
a direction finder for determining the direction in which the video camera is directed and for outputting a signal representing the so determined direction;
an image-data memory for analogue-to-digital converting 360 degree-wide picture signals taken by the video camera and for storing the so converted signals for each frame;
image data reading means for retrieving 360 degree-wide picture data spirally from the image-data memory for each frame while referring to the directional data supplied from the direction finder;
image data expanding means for transforming the 360 degree-wide picture data into expanded picture data for each field by referring to the coordinate transformation table; and moving-image display means for digital-to-analogue converting the expanded picture data for each field and for outputting signals representing moving images, whereby the 360 degree-wide pictures taken by the video camera may be converted to the expanded images to display moving images of the inner surface of the bored hole.
2. A hole wall surface observing apparatus comprising:
an illuminating unit for throwing light to the inner surface of a bored hole in all directions;
a video camera equipped with wide-angle picture taking means for taking 360 degree-wide pictures of the hollow surface from a single point of view at one time;
moving means for moving the video camera;
a direction finder for determining the direction in which the video camera is directed and for outputting a signal representing the so determined direction;
a range finder for determining the distance which the video camera travels, and for outputting a signal representing the so determined distance;
an image-data memory for analogue-to-digital converting 360 degree-wide picture signals taken by the video camera, for storing the so converted signals for each frame, and for storing the image data supplied from the video camera when being moved the eye-to-eye distance by the moving means;
moving-image display means for digital-to-analogue converting the image data and for outputting signals representing moving images, whereby 360 degree-wide, stereographic pictures of the inner surface of the hole may be provided by separately presenting to left and right eyes pictures produced from image signals of pre- and post-movements.
an illuminating unit for throwing light to the inner surface of a bored hole in all directions;
a video camera equipped with wide-angle picture taking means for taking 360 degree-wide pictures of the hollow surface from a single point of view at one time;
moving means for moving the video camera;
a direction finder for determining the direction in which the video camera is directed and for outputting a signal representing the so determined direction;
a range finder for determining the distance which the video camera travels, and for outputting a signal representing the so determined distance;
an image-data memory for analogue-to-digital converting 360 degree-wide picture signals taken by the video camera, for storing the so converted signals for each frame, and for storing the image data supplied from the video camera when being moved the eye-to-eye distance by the moving means;
moving-image display means for digital-to-analogue converting the image data and for outputting signals representing moving images, whereby 360 degree-wide, stereographic pictures of the inner surface of the hole may be provided by separately presenting to left and right eyes pictures produced from image signals of pre- and post-movements.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPP08-151650 | 1996-05-23 | ||
| JP15165096A JPH09312835A (en) | 1996-05-23 | 1996-05-23 | Hole wall face observation device |
| PCT/JP1997/001719 WO1997044958A1 (en) | 1996-05-23 | 1997-05-22 | Bored wall surface observation apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2255820A1 true CA2255820A1 (en) | 1997-11-27 |
Family
ID=15523214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002255820A Abandoned CA2255820A1 (en) | 1996-05-23 | 1997-05-22 | Bored wall surface observation apparatus |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH09312835A (en) |
| AU (1) | AU715836B2 (en) |
| CA (1) | CA2255820A1 (en) |
| WO (1) | WO1997044958A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3728535B2 (en) * | 2003-07-17 | 2005-12-21 | 関西電力株式会社 | In-pipe defect dimension measurement system and method |
| JP5264623B2 (en) * | 2009-06-05 | 2013-08-14 | 日鐵住金建材株式会社 | Measuring device fixing device for surveying inner wall of shaft |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62198272A (en) * | 1986-02-26 | 1987-09-01 | Central Res Inst Of Electric Power Ind | Borehole television camera equipment |
| JPH04368594A (en) * | 1991-06-17 | 1992-12-21 | Nichiboo:Kk | Camera device for borehole inside wall |
| JPH06292204A (en) * | 1993-04-05 | 1994-10-18 | Electric Power Dev Co Ltd | Shade processing system for bore hole television camera equipment |
-
1996
- 1996-05-23 JP JP15165096A patent/JPH09312835A/en active Pending
-
1997
- 1997-05-22 WO PCT/JP1997/001719 patent/WO1997044958A1/en active Application Filing
- 1997-05-22 CA CA002255820A patent/CA2255820A1/en not_active Abandoned
- 1997-05-22 AU AU27915/97A patent/AU715836B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO1997044958A1 (en) | 1997-11-27 |
| JPH09312835A (en) | 1997-12-02 |
| AU2791597A (en) | 1997-12-09 |
| AU715836B2 (en) | 2000-02-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20010522 |