JP5775646B1 - Point needle type meter image analysis apparatus, indicator needle type meter image analysis method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image analysis apparatus for a pointing needle type meter and the like capable of detecting the direction of the pointing needle using image data of a part of the pointing needle. An image reference point is set for image data in which a part or all of the pointing needle is photographed, and a closed convex line that surrounds the image reference point and crosses the pointing needle at the front end side and the other end side is set. To do. Then, binarization processing is performed on the closed convex line, and at each point on the closed convex line, the values of the origin coordinate and the diagonal coordinate are corrected in relation to the image reference point, and the tip side is used by using the corrected value. The direction pointed by the indicator needle is specified by the crossing part. According to the present invention, it is not necessary to perform image processing of the entire pointing needle, and the direction of the pointing needle can be detected using a part of the image data of the pointing needle by reducing the amount of image to be analyzed. [Selection] Figure 1

Description

  The present invention relates to an image analysis apparatus for an indicator needle type meter, an image analysis method for an indicator needle meter, and a program, and in particular, an indicator needle that specifies the direction of the indicator needle from image data obtained by photographing the indicator needle of the indicator needle meter. The present invention relates to an image analyzer for a type meter.

  The indicator needle meter is equipped with an indicator needle that rotates around the rotation axis, and the amount and direction to be measured can be known from the amount of deflection of the indicator needle. It is used in hydraulic gauges, oil level gauges, etc. Has been.

  Japanese Patent Application Laid-Open No. H10-228707 describes that an instruction value is automatically read using an image taken by an analog meter from an oblique direction. Patent Document 2 describes that a pointer-type meter is photographed and the pointer is recognized using a gray value and a characteristic amount of a predetermined pointer. Patent Document 3 describes performing an inspection by performing edge processing on a binarized image of an inspection object.

JP 2006-120133 A JP 2002-188939 A JP 2001-357401 A

  Conventionally, as described in Patent Documents 1 to 3, the mainstream is to calculate the entire indicating needle. However, in order to capture the entire image of the pointing needle meter, it is necessary to capture from a certain distance from the subject. Therefore, it is necessary to devise in order to attach the photographing equipment. In addition, there is a problem that the power supply to the photographing equipment increases and the operation cost increases. Furthermore, in order to calculate the contour and direction of the pointing needle from the entire image of the pointing needle type meter, it is necessary to process a lot of image data, and the image analysis time becomes enormous.

  Therefore, an object of the present invention is to provide a pointer needle meter image analysis apparatus and the like that can detect the direction of the pointer using the image data of a part of the pointer.

  A first aspect of the present invention is an image analysis device for an indicator needle meter that specifies the direction of the indicator needle from image data obtained by photographing the indicator needle of an indicator needle meter, wherein a part of the pointer of the meter or In the image data obtained by photographing all, image reference setting means for setting an image reference point, and in the image data, the image reference point is surrounded, and the one end side and the opposite end side of the pointer are Closed convex line setting means for setting a closed convex line crossing the indicator needle, and binarization processing means for binarizing the image data according to whether each point on the closed convex line is a meter surface or a non-meter surface; Of the points on the non-metered surface on the closed convex line, the one end side that is the part that the closed convex line crosses on the one end side and the other end side that is the part that the closed convex line crosses on the other end side Extraction means to extract the part and the previous Selection means having one of the one end side part and the other end side part as a tip side part; a direction reference point from the tip side part; a direction from the image reference point to the direction reference point; Direction specifying means for specifying as the direction indicated by.

According to a second aspect of the present invention, there is provided the pointing needle type meter image analysis apparatus according to the first aspect, wherein at least each point of the non-meter surface on the closed convex line is opposite to the image reference point. point of said closed convex line is determined whether others or meter surfaces located, a point located on the opposite of the points of the one end side portion is excluded from the one end side portion of the point where the meter face, Correcting means is provided for excluding, from the other end side portion, a point at which the opposite point of each point of the other end side portion becomes a meter surface.

According to a third aspect of the present invention, there is provided the pointing needle type meter image analysis apparatus according to the second aspect, wherein the correction means is configured such that a point located opposite to each point of the one end side portion is a non- meter surface. The other end side point group on the closed convex line is extracted, and the one end side point group on the closed convex line where the point located opposite to each point of the other end side portion is a non- meter surface is extracted, The selection means obtains the selection reference point of the one end side portion and the selection reference point of the other end side portion, compares the distance from each to the one end side point group and the other end side point group, and is short. Is selected as the tip side portion.

  A fourth aspect of the present invention is the pointing needle meter image analysis apparatus according to the second or third aspect, wherein the closed convex line is a circle centered on the image center point, and the correction means Is the other end point of the diameter having each point of the one end side portion as one end point, and the other end point of the diameter having each point of the other end side portion as one end point. , And the direction specifying means uses the centers of both ends of the tip end side portion as the direction reference point.

A fifth aspect of the present invention is the pointing needle type meter image analysis apparatus according to any one of the second to fourth aspects, wherein the closed convex line setting means surrounds the image reference point, and the pointing needle A plurality of closed convex lines that cross the indicator needle are set on one end side and the opposite end side, and the binarization processing means determines whether each point on each closed convex line is a meter plane or a non-meter plane. The extraction means is configured to extract each of the points on the one end side and the other end side of the points on the non-meter surface on the closed convex lines. The other end side portion that is a portion traversed by the closed convex line is extracted, and the correction unit is configured to position each of the points on the non-meter surface on each of the closed convex lines opposite to the image reference point. the closed convex line points is determined whether others or meter face, each of said one end portion The one excluded from the end portion, the other end portion points a point located opposite the meter face of each point of the other end portion points a point located opposite the meter face of In addition, a point which is not continuous in the one end side portion with respect to the plurality of closed convex lines and / or the other end side portion with respect to the plurality of closed convex lines is excluded.

  According to a sixth aspect of the present invention, there is provided the pointing needle meter image analysis apparatus according to any one of the second to fifth aspects, wherein the image reference setting means is at least one of the one ends after being excluded by the correction means. When the side portion and / or the other end side portion does not exist, the one end side reference point and the other end side reference point are calculated from the one end side portion and the other end side portion before exclusion, respectively, and the one end A corrected image reference candidate point is calculated from the side reference point and the other end side reference point, and the corrected image reference candidate point is set as the image reference point.

  A seventh aspect of the present invention is the pointing needle meter image analysis apparatus according to any one of the first to sixth aspects, wherein the image center point setting means includes mesh coordinates in addition to the image center point. A system is set, and the binarization processing means and the extraction means perform processing based on a mesh instead of a point.

  An eighth aspect of the present invention is an indicator needle meter photographing device for acquiring image data according to any one of the first to seventh aspects, and is attached to a light-transmitting surface of the indicator needle meter. And an imaging unit that acquires the image data by imaging a part or all of the indicator needle in a state of being attached to the translucent surface of the indicator needle meter.

  According to a ninth aspect of the present invention, there is provided an image analysis method for a pointing needle meter that specifies the direction of the pointing needle from image data obtained by photographing the pointing needle of the pointing needle meter, and the image reference setting provided in the image analysis device An image reference point setting step for setting an image reference point in the image data obtained by photographing a part or all of the meter pointer, and a closed convex line setting means provided in the image analysis device, In the image data, a closed convex line setting step for setting a closed convex line that surrounds the image reference point and crosses the indicator needle at one end side opposite to the one end side of the indicator needle, and a binary included in the image analysis device A binarizing step in which binarization processing means binarizes the image data at each point on the closed convex line depending on whether it is a meter surface or a non-meter surface; Extract one end side portion where the closed convex line crosses on the one end side and the other end side portion where the closed convex line crosses on the other end side of each point of the non-meter surface on the line An extraction step, a selection step provided in the image analysis device, a selection step in which one of the one end side portion and the other end side portion is a tip side portion, and a direction reference point calculation means provided in the image analysis device However, the direction reference point calculating step for obtaining the direction reference point from the tip side portion, and the direction specifying means provided in the image analysis apparatus, the direction indicating the direction from the image reference point to the direction reference point is indicated by the pointing needle. A direction specifying step for specifying is included.

  A tenth aspect of the present invention is a program for realizing, in a computer, the pointing needle type meter image analysis method according to the ninth aspect.

  The present invention may be considered as a computer-readable recording medium for recording the program according to the tenth aspect.

  According to each aspect of the present invention, with respect to image data in which a part or all of the indicator needle is photographed, the direction indicated by the indicator needle using a closed convex line that crosses the indicator needle on the front end side and the other end side is used. Identify. Therefore, it is not necessary to perform image processing of the entire pointing needle, and the direction of the pointing needle can be detected using a part of the image data of the pointing needle by reducing the amount of image to be analyzed.

  Furthermore, according to the 2nd viewpoint of this invention, the part by which the indicator needle | hook is image | photographed can be utilized accurately by performing correction | amendment by a correction | amendment means using the correspondence using an image reference point.

  Furthermore, according to the third aspect of the present invention, it is possible to accurately detect the direction of the pointing needle by determining the tip side using the correspondence relationship using the image reference point.

  Further, according to the fourth aspect of the present invention, by making the closed convex line a circle, it is possible to simplify the processing related to the correspondence using the image reference point and reduce the load.

  Further, according to the fifth aspect of the present invention, by utilizing a plurality of closed convex lines, not only the indicator needle is detected in a plane but also information such as characters and dirt is excluded by excluding non-contiguous points. It becomes possible to eliminate.

  Furthermore, according to the sixth aspect of the present invention, even when the pointing needle does not pass through the image reference point, it can be recognized as the pointing needle by correcting the image reference point.

  Furthermore, according to the 7th viewpoint of this invention, a load can be reduced by performing a process per mesh.

  Further, according to the eighth aspect of the present invention, since the indicator needle meter image analyzer uses a part of the indicator needle in the image data, the indicator needle meter imaging device images the entire indicator needle. It is not necessary to do so, and it can be attached to the light-transmitting surface of the meter by the attaching portion and photographed. In this way, the camera for taking an image can be reduced in size and can be directly attached to the glass surface of an existing meter. Furthermore, since the image data is also small in volume, the communication time between the imaging device and the image analysis device can be shortened, and the power consumption of the device can be reduced, so that installation work costs and running costs can be greatly reduced. . Furthermore, by incorporating a wireless communication device, it is possible to collect information remotely, which is effective in reducing costs by saving labor such as maintenance and inspection.

It is a figure which shows an example of a structure of the detection system which concerns on embodiment of this invention. It is a flowchart which shows an example of operation | movement of the detection system 1 of FIG. It is a figure which shows the case where the direction of an indicator needle is detected using one circle. It is a figure which shows the case where the direction of a pointer is detected using a plurality of circles. It is a figure which shows an example of a process when an image reference point does not pass a pointer. It is a figure which shows the example of the concrete structure of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. The embodiment of the present invention is not limited to the following examples.

  FIG. 1 is a diagram showing an example of the configuration of a detection system according to an embodiment of the present invention. The detection system 1 includes an indicator needle meter 3, an indicator needle meter imaging device 5, and an indicator needle meter image analysis device 7.

  The indicator needle type meter 3 is provided with an indicator needle that rotates around the needle fulcrum, and the amount and direction to be measured can be known from the deflection amount of the indicator needle. The indicator needle has a shape in which the tip is thin and the width gradually increases toward the other end. The indicator needle rotates between the metered surface and the translucent surface. Therefore, in general, the user can know the amount and direction to be measured by reading the scale indicated by the tip of the indicator needle from the translucent surface.

  The indicator needle meter photographing device 5 photographs the indicator needle of the indicator needle meter 3. The indicator needle meter imaging device 5 includes an attachment portion 11 (an example of “attachment means” in the claims of the present application), an imaging portion 13 (an example of “imaging means” in the claims of the present application), and an imaging communication portion 15. . The attachment portion 11 is for attaching to the light-transmitting surface of the indicator needle meter 3. The photographing unit 13 obtains photographing data by photographing at least a part of the indicating needle and a part of the meter surface. The photographing communication unit 15 transmits photographing data to the indicator needle meter image analyzing device 7. In the present invention, it is not necessary to photograph the entire indicating needle. Therefore, the imaging unit 13 can take an image with the attachment unit 13 attached to the light-transmitting surface. Therefore, the indicator needle meter imaging device 5 can be easily attached to the indicator needle meter 3.

  The indicator needle meter image analysis device 7 detects the direction indicated by the tip of the indicator needle using a closed convex line that crosses the opposite side of the tip of the indicator needle in the image data. Below, it demonstrates using a circle as an example of a closed convex line. The pointing needle type meter image analysis device 7 includes an analysis communication unit 17, an image reference setting unit 19 (an example of “image reference setting unit” in the present application claim), and a circle setting unit 21 (“closed convex” in the present application claim). An example of “line setting means”, a binarization processing unit 23 (an example of “binarization processing means” in the claims), an extraction unit 25 (an example of “extraction means” in the claims), and a correction A unit 27 (an example of “correction unit” in the claims of the present application), a selection unit 29 (an example of “selection unit” in the claims of the present application), and a direction specifying unit 31 (an example of “direction specifying unit” of the claims of the present application) And a display unit 33.

  The analysis communication unit 17 receives the image data transmitted from the photographing communication unit 15 and stores it in a storage unit (not shown). The image reference setting unit 19 sets mesh coordinates having the image reference point as the origin in the image data stored in the storage unit. The circle setting unit 21 sets one or a plurality of circles centering on the image reference point and crossing the indicator needle on the front end side and the other end side. The binarization processing unit 23 binarizes each circumference mesh set by the circle setting unit 21 depending on whether it is a meter surface or a meter surface (non-meter surface). The extraction unit 25 identifies two portions of the circumference that cross the indicator needle. One end side is called “one end side portion”, and the other end side is called “other end side portion”. The correction unit 27 corrects each value in each mesh, as will be described later. The selection unit 29 specifies the distal end side of the indicator needle and sets one of the one end side portion and the other end side portion as the distal end side portion. The direction specifying unit 31 specifies the direction of the pointing needle from the image reference point and the tip side portion. The display unit 33 displays a scale corresponding to the process of image processing, the direction of the indicator needle, the direction of the indicator needle, and the like.

  The indicator needle meter photographing device 5 and the indicator needle meter image analyzing device 7 may be realized as one device. In that case, the imaging communication unit 15 and the analysis communication unit 17 can be omitted.

  With reference to FIG. 2, an example of operation | movement of the analysis system 1 of FIG. 1 is demonstrated. FIG. 2 is a flowchart showing an example of the operation of the detection system 1 of FIG.

  The indicator needle meter photographing device 5 is attached to the light-transmitting surface of the indicator needle meter 3 by the attachment portion 11. The imaging unit 13 captures part or all of the indicator needle of the indicator needle meter 3 to obtain imaging data (step ST1). The imaging communication unit 15 transmits the imaging data, and the analysis communication unit 17 receives it.

  The image reference setting unit 19 sets mesh coordinates with the image reference point as the origin (step ST2).

  The circle setting unit 21 sets a circle centering on the image reference point and crossing the indicator needle on the tip side and the other end side (step ST3).

  The binarization processing unit 23 binarizes each mesh of the circumference set by the circle setting unit 21 depending on whether it is a meter surface or a non-meter surface (step ST4). The extraction unit 25 identifies two portions of the circumference that cross the indicator needle. One end side is called “one end side portion”, and the other end side is called “other end side portion”.

  The circle setting unit 21 determines whether there are two crossing portions on the set circumference (step ST5). If traversing, return to step ST3, set a new circle with a smaller radius, and binarize in step ST4. Repeat until no more crossing.

  Step ST5 is an example of processing using a plurality of circles, as will be described with reference to FIG. The plurality of circles may be set, for example, by first setting a small circle and increasing the radius, or may be set while increasing or decreasing the radius. Further, as will be described with reference to FIG. 3, when detecting the direction of the pointing needle using a single circle, the processing related to step ST <b> 5 may be omitted. Further, the increase / decrease width may be a constant value based on the mesh width or the like, or may be non-uniform.

  The correction unit 27 corrects each value in each mesh (step ST6). The correction process by the correction unit 27 will be specifically described with reference to FIGS. 3C and 4B.

  The image reference setting unit 19 determines whether or not the image reference point is appropriate (step ST7). If not appropriate, the one end side reference point and the other end side reference point are calculated (step ST8), the corrected image reference candidate point is calculated (step ST9), and the process returns to step ST2, and the corrected image reference candidate point is calculated. Mesh coordinates are set as a new image reference point. A specific example will be described with reference to FIG.

  If the image reference point is appropriate, the selection unit 29 specifies the distal end side of the pointing needle and sets one of the one end side portion and the other end side portion as the distal end side portion (step ST10). Then, the direction specifying unit 31 obtains a direction reference point from the tip side portion (step ST11), and specifies the direction of the pointing needle from the image reference point and the direction reference point (step ST12).

  This will be specifically described with reference to FIGS.

  FIG. 3 is a diagram for explaining a case where the direction of the pointing needle is detected using one circle.

  (Procedure 1-1) FIG. 3A is an overall view of the pointer meter. The central star is an image reference point, and mesh coordinates (XY axis) with this as the origin are set. In the following, in the figure, the angle θ at which the pointing needle points to the downward M direction from the origin is specified. For the sake of simplicity, FIG. 3 shows an example in which the rotation axis of the indicator needle coincides. Next, the circumference is drawn around the image reference point (star). In FIG. 3A, it is indicated by a broken-line circle. Subsequently, binarization processing is performed on each mesh on the circumference using the binarization conversion table of Table 1. FIG. 3B shows the result after the binarization process. A mesh group of “1” is detected at a portion crossing between the one end side and the other end side.

  (Procedure 1-2) Next, using the correction conversion table in Table 2, the values obtained by converting the coordinates on the circumference and the coordinates on the diagonal to the image reference point (star mark, origin of mesh coordinates) into a numerical value. Correct the value. FIG. 3C shows the value of each mesh after correction. For example, if the mesh a is a starting point coordinate, the diagonal coordinate is a '. The starting point coordinate is “1”, while the diagonal coordinate is “1”. Therefore, it remains “1” after correction. Similarly, since the diagonal coordinate b 'with the mesh of b as the starting point coordinate is also "1", it remains "1" after correction. The diagonal coordinate c ′ having the mesh c as the starting point coordinate is corrected to “2” because the starting point coordinate is “1” and the diagonal coordinate is “0”. Further, since the starting coordinate is “0” and the diagonal coordinate is “1”, the diagonal coordinate c having the mesh of c ′ as the starting coordinate is corrected to “3”. In the case of the diagonal coordinate d ′ having the mesh of d as the starting point coordinate, since the starting point coordinate is “1” and the diagonal coordinate is “0”, the starting point coordinate is corrected to “2”. In addition, since the starting point coordinate is “0” and the diagonal coordinate is “1”, the starting point coordinate is corrected to “3” with respect to the diagonal coordinate d having the mesh of d ′ as the starting point coordinate.

  (Procedure 1-3) Based on the corrected value, parts other than the coordinates specified as the pointer part (“0”, “2”, “3” in the correction conversion table) are excluded from the target of the pointer part. The minimum unit (minimum width) of the pointer portion that crosses the circumference is obtained. Here, ab and a'-b '.

  (Procedure 1-4) As shown in FIG. 3 (d), the center point (1/2 width) of each of the minimum widths (ab, a'-b ') of the pointer portion across the circumference and the circle Connect the center point (image reference point) with a straight line.

  (Procedure 1-5) On the circumference from the coordinate point of the center point π / 2 (ab / 2), π ′ / 2 (a′-b ′ / 2) of the pointer portion obtained in Procedure 1-4 Then, the correction conversion result “3” is obtained, and the direction in which the distance from the center point is short is defined as the tip direction of the pointer portion. In FIG.3 (c), the coordinate side of ab becomes the front-end | tip direction of a pointer | guide part.

  (Procedure 1-6) The center point defined as the tip direction of the pointer from the direction of M in FIG. 3B with the center point (ab / 2) defined as the tip direction of the pointer as a direction reference point The angle up to (ab−2) is obtained as an angle “θ” indicated by the pointer.

  (Procedure 1-7) Reading of the scale indicated by the pointer from the result of steps 1-5 and 1-6, and a pre-defined scale range for each measuring instrument, a table of weights and angles of one scale The value can be determined.

  FIG. 4 is a diagram for explaining a case where the direction of the pointing needle is detected using a plurality of circles.

As shown in FIG. 3 (a), the meter surface has characters and scales in addition to the indicator needle, and also has dirt such as stains. For this reason, the image data obtained by photographing includes data other than the pointing needle. In this way, when trying to express only the pointer from the whole image by image analysis, characters, scales, dirt, etc. must be analyzed until information other than the pointer part is analyzed, the processing speed is slow, and the data communication volume is reduced. There are problems such as enormous volume. As a means for solving this problem, as shown in FIG. 3A, by analyzing only a part of the photographed image, unnecessary information such as characters and scales is eliminated, analysis time is shortened, and processing data is processed. It is possible to minimize the amount.

  FIG. 4 is an explanatory diagram of a technique for eliminating information other than the pointer portion such as characters, scales, and dirt in the image by using a plurality of circles.

  (Procedure 2-1) The process of Procedure 1-1 is repeated n times on different circumferences. FIG. 4A shows the result after binarization processing for each circumference. Unlike FIG. 3, binarization processing is also performed on the “METER” portion. The method of drawing the circumference at this time is from the circumference shown in FIG. 3 until the XY axis is uniformly increased to reach the image width to be analyzed, and the circumference is reduced equally to enter the indicator needle. Up to.

  (Procedure 2-2) FIG. 4B shows a result obtained by performing correction according to Procedure 1-2 on the obtained binarization results for n times. If the image does not contain information such as characters on the diagonal of the circumference like the data on the X (8) and Y (−7) axes in FIG. 2 "or" 3 ". Therefore, it will not be handled as a pointer part, and character information and the like will be excluded.

  (Procedure 2-3) On the other hand, it can be seen that there is no corrected value “1” in succession to the coordinates on the straight line for each of the characters present on the diagonal line that does not overlap the pointer portion. As described above, when there is a correction value “1” having no continuity, it is possible to eliminate a character existing on a diagonal line by not recognizing it as a pointer portion. FIG. 4C shows only the correction result “1”, which is a relative result from the image reference point.

  FIG. 5 is a diagram for explaining an example of processing when the image reference point does not pass through the pointing needle. In the method described with reference to FIGS. 3 and 4, when the indicator needle portion does not pass through the center of the image, a phenomenon that cannot be recognized as the indicator needle portion may occur. A solution to this problem will be described with reference to FIG.

  (Procedure 3-1) FIG. 5A shows the result after the binarization process of Procedure 1-1 when the indicator needle portion does not pass through the center of the image. In this case, as shown in FIG. 5B, all the correction results by the procedure 1-2 are the results other than the pointer part “2”. For this reason, the indicating needle part cannot be extracted. If the pointer portion does not exist as a result of the correction processing, a straight line connecting the centers of the pointer portion yellow and the needle crossing the circumference is drawn as shown in FIG. .

  (Procedure 3-2) After shifting the position of the obtained center point c on the XY axis to the center of the image as shown in FIG. 5D, the processing after Procedure 1-1 is performed again. The angle θ of the pointer part can be obtained.

  FIG. 6 is a diagram showing an example of a specific configuration of the present invention. Most conventional image analysis techniques and constituent devices calculate the angle of the pointer and the reading of the scale from the image taken by the camera from a place where the entire measuring instrument is separated by a certain distance or more. For this reason, it is necessary to secure a space when performing the construction, or problems such as the camera installation position being unable to be taken in the layout of the equipment may occur.

  In the present invention, the angle of the pointer and the value of the scale can be calculated from image analysis of a part of the indicator needle portion of the indicator needle meter. Therefore, the camera body for photographing can be reduced in size, and the above problems can be solved.

  According to the present invention, since an image necessary for analyzing the angle of the pointing needle can be performed by a part of the measuring instrument meter, it can be handled by a small close-up lens. Therefore, it can be configured as shown in FIG. In this way, since the photographing camera can be small, it can be much smaller than the conventional photographing camera. As a result, the camera for photographing can be directly attached to the lens surface of the measuring instrument meter, and the construction is very convenient.

  In addition, the lighting system is built in the main body of the device, so there is no need for external lighting for shooting at night or in the dark, so there is no need to secure lighting fixtures or space for installation, and installation work should be easy. Can do.

Furthermore, irradiating the photographing camera for attachable to direct the lens surface, in addition to lighting adjustment of the image by the reflected light of the lens is not necessary, as a method for dispersing the light of illumination, the light on the meter surface via the optical fiber Therefore, the light source is dispersed and the reflected light on the meter surface is reduced.

  Furthermore, the diffusion plate that cuts off the reflected light enables image acquisition that does not require daylighting adjustment, and problems such as camera installation conditions due to illumination are solved.

  In addition, since devices such as cameras and lighting are small, the drive power capacity is small, so it is possible to drive for a long time with a small battery such as a dry battery, eliminating the need for external power supply construction and convenience. is there.

  The communication system of this device can be used for both wireless and wired connections, and since it is possible to connect multiple cameras for shooting with a single wireless device, there is also the convenience that the installation of unnecessary communication cables can be omitted. .

  According to this invention, the camera part used by the conventional image monitoring is small, and can be attached to the glass surface of a pointer needle type meter. Therefore, it is not necessary to improve existing facilities, and the installation can be easily and inexpensively.

  DESCRIPTION OF SYMBOLS 1 Detection system, 3 Indicator needle type meter, 5 Indicator needle type meter imaging device, 7 Indicator needle type meter image analysis device, 11 Mounting portion, 13 Imaging portion, 15 Shooting communication portion, 17 Analysis communication portion, 19 Image standard Setting unit, 21 circle setting unit, 23 binarization processing unit, 25 extraction unit, 27 correction unit, 29 selection unit, 31 direction identification unit, 33 display unit d

Claims (9)

An image analysis device for an indicating needle type meter that specifies the direction of the indicating needle from image data obtained by photographing the indicating needle of the indicating needle type meter,
In the image data obtained by photographing a part or all of the pointer of the meter, an image reference setting means for setting an image reference point;
In the image data, a closed convex line setting means for setting a closed convex line that surrounds the image reference point and crosses the indicator needle at one end side and the opposite end side of the indicator needle;
In the image data, binarization processing means for binarizing at each point on the closed convex line depending on whether it is a meter surface or a non-meter surface;
Of the points on the non-metered surface on the closed convex line, the one end side that is the part that the closed convex line crosses on the one end side and the other end side that is the part that the closed convex line crosses on the other end side Extraction means for extracting the part;
At least for each point on the non-meter surface on the closed convex line, it is determined whether a point on the closed convex line located opposite to the image reference point is a meter surface or the other, and each of the one end side portions The point where the opposite point among the points is the meter surface is excluded from the one end side portion, and the point where the opposite point among the points of the other end side portion is the meter surface is the other end side Correction means to be excluded from the part,
A selection means having one of the one end side portion and the other end side portion as a tip end portion;
An image analysis apparatus for a pointing needle type meter, comprising: direction specifying means for obtaining a direction reference point from the tip side portion and specifying a direction from the image reference point to the direction reference point as a direction indicated by the indicator needle. The correction means includes
The other end side point group which is a group of points on the closed convex line which is located opposite to each point of the one end side portion and becomes a non- meter surface,
One point side point group that is a group of points on the closed convex line that is located opposite to each point of the other end side portion and becomes a non- meter surface,
The selection means includes
Obtaining a selection reference point of the one end side portion and a selection reference point of the other end side portion;
Comparing the distance from the selected reference point of the distance between the other end portion of the selected reference point of the one end portion to said one end side point group to the other end point group, the tip side short selecting as a partial, indicator needle meter image analyzing apparatus according to claim 1. The closed convex line is a circle centered on the image center point;
The correction means includes
The other end point of the diameter having each point of the one end side portion as one end point is a point located opposite to the above,
The other end point of the diameter having each point of the other end side portion as one end point is a point located opposite to the above,
The direction specifying means, the center points of both ends of the distal end side portion and said direction reference point, indicator needle meter image analysis apparatus according to claim 1 or 2. The closed convex line setting means sets a plurality of closed convex lines that surround the image reference point and cross the indicator needle at one end side and the opposite end side of the indicator needle,
The binarization processing means binarizes at each point on each closed convex line depending on whether it is a meter surface or a non-meter surface,
The extracting means includes a first end portion and a second end portion of the non-metered surface on the first and second end portions of the non-meter surface. And extract the other end side part that crosses
The correction means includes
At least for each point on the non-meter surface on each closed convex line, it is determined whether the point on each closed convex line located opposite to the image reference point is a meter surface or the other, and the one end side portion The points on the opposite side of the points are excluded from the one end side portion, and the points on the opposite end of the other end portion are the meter surface. Exclude from the end part,
The indication according to any one of claims 1 to 3 , wherein non-continuous points are excluded in the one end side portion with respect to the plurality of closed convex lines and / or the other end side portion with respect to the plurality of closed convex lines. Image analyzer for needle type meter. The image reference setting means includes
When at least the one end side portion and / or the other end side portion after exclusion by the correcting means are not present,
Calculate one end side reference point and the other end side reference point from the one end side portion and the other end side portion before exclusion, respectively,
A corrected image reference candidate point is calculated from the one end side reference point and the other end side reference point,
The pointing needle type meter image analysis device according to any one of claims 1 to 4 , wherein the corrected image reference candidate point is the image reference point. An image analysis device for an indicating needle type meter that specifies the direction of the indicating needle from image data obtained by photographing the indicating needle of the indicating needle type meter,
In the image data obtained by photographing a part or all of the pointer of the meter, image reference setting means for setting an image reference point and a mesh coordinate system ,
In the image data, a closed convex line setting means for setting a closed convex line that surrounds the image reference point and crosses the indicator needle at one end side and the opposite end side of the indicator needle;
In the image data, in each mesh in the closed convex line, binarization processing means for binarizing depending on whether the meter surface or the non-meter surface,
Of the meshes of the non-meter surface on the closed convex line, one end side part that is the part where the closed convex line crosses on the one end side and the other end side that is the part that the closed convex line crosses on the other end side Extraction means for extracting the part;
A selection means having one of the one end side portion and the other end side portion as a tip end portion;
An image analysis apparatus for a pointing needle type meter, comprising: direction specifying means for obtaining a direction reference point from the tip side portion and specifying a direction from the image reference point to the direction reference point as a direction indicated by the indicator needle. An image analysis device for an indicating needle type meter that specifies the direction of the indicating needle from image data obtained by photographing the indicating needle of the indicating needle type meter,
In the image data obtained by photographing a part or all of the pointer of the meter, an image reference setting means for setting an image reference point;
In the image data, a closed convex line setting means for setting a closed convex line that surrounds the image reference point and crosses the indicator needle at one end side and the opposite end side of the indicator needle;
In the image data, binarization processing means for binarizing at each point on the closed convex line depending on whether it is a meter surface or a non-meter surface;
Of the points on the non-metered surface on the closed convex line, the one end side that is the part that the closed convex line crosses on the one end side and the other end side that is the part that the closed convex line crosses on the other end side Extraction means for extracting the part;
A selection means having one of the one end side portion and the other end side portion as a tip end portion;
The image data in the indicating needle type meter image analysis device including direction specifying means for obtaining a direction reference point from the tip side portion and specifying a direction from the image reference point to the direction reference point as a direction indicated by the indicator needle. An indicator needle meter photographing device for obtaining
An attaching portion for attaching to the light-transmitting surface of the indicator needle meter;
An imaging device for an indicator needle meter, comprising an imaging unit that acquires the image data by imaging a part or all of the indicator needle in a state of being attached to a light-transmitting surface of the indicator needle meter. An image analysis method for an indicator needle meter that specifies the direction of the indicator needle from image data obtained by photographing the indicator needle of an indicator needle meter,
An image reference point setting step for setting an image reference point in the image data obtained by photographing part or all of the meter pointer, the image reference setting means provided in the image analysis device;
A closed convex line setting means provided in the image analysis device sets a closed convex line that surrounds the image reference point and crosses the indicator needle on the opposite side to the one end side of the indicator needle in the image data. A line setting step;
A binarization step in which the binarization processing means included in the image analysis apparatus binarizes the image data according to whether each point on the closed convex line is a meter surface or a non-meter surface;
The extraction means included in the image analysis apparatus is configured such that, of each point of the non-meter surface on the closed convex line, the closed convex line crosses the closed convex line on the one end side and the closed side on the other end side. An extraction step of extracting the other end side portion that is a portion that the convex line crosses;
The correction means included in the image analysis device determines whether at least each point on the non-meter surface on the closed convex line is a point on the closed convex line positioned opposite to the image reference point on the meter surface or otherwise. Determining, excluding from the one end side part a point where the opposite point of each point of the one end side part becomes a meter surface, and a point positioned opposite of each point of the other end part A correction step of excluding a point to be a meter surface from the other end portion;
The selecting step provided in the image analysis apparatus includes a selection step in which one of the one end side portion and the other end side portion is a tip side portion;
A direction reference point calculating means provided in the image analysis apparatus, a direction reference point calculating step for obtaining a direction reference point from the tip side portion;
A pointing needle meter image analysis method including a direction specifying step in which a direction specifying means provided in the image analysis device specifies a direction from the image reference point to the direction reference point as a direction indicated by the indicator needle. The program for implement | achieving the image analysis method for indicator needle type meters of Claim 8 in a computer.