JP2015178984A - Photographic measuring system and photographic position indication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographic measuring system capable of easily taking a photograph while ensuring measuring accuracy.SOLUTION: A photographic measuring system comprises: a three-dimensional model generation function unit reading design data on a measuring object 8 and generating a three-dimensional model of the measuring object 8 within a virtual three-dimensional space; a measuring point setting function unit setting measuring points; a photographic positioning target setting function unit setting feature points from a boundary line or an outline as a photographic positioning target; a photographic position derivation function unit deriving a plurality of photographic positions using the three-dimensional model; photographic positioning image generation function unit generating a photographic positioning image in which the measuring object 8 possibly shows up and a photographic positioning image in which the photography positioning target possibly shows up, respectively using the three-dimensional model; and a photographic position display function unit displaying each photographic position; and a photographic positioning image display function unit displaying the respective photographic positioning images.

Description

  The present invention relates to a photo measurement system and a photo shooting position indication method for obtaining photogrammetry by obtaining three-dimensional coordinates from a photo taken at a plurality of photo shooting positions, and in particular, taking a photo while ensuring measurement accuracy. It can be performed easily.

  After producing a three-dimensional structure, photogrammetry is used as one of the methods for confirming whether or not it is made as designed. However, since the measurement accuracy by photogrammetry varies depending on the photo shooting position and the number of shots, it depends on the skill and experience of the measurer. Therefore, the conventional photo measurement system uses a method of indicating the photo shooting position in order to stabilize the measurement accuracy.

  As a method for determining a photo shooting position, first, a measurement point for which photo measurement is desired is set for a model created in the 3D CAD space based on design data of a measurement object. A virtual photo shooting position at which this measurement point can be taken is set in the 3D CAD space, and a photo measurement simulation is performed using the photo taken at each virtual photo taking position to calculate the measurement accuracy.

  If the calculated measurement accuracy is lower than the predetermined accuracy, the virtual photo shooting position is changed or the virtual photo shooting position is added, and the measurement accuracy is calculated again. When the calculated measurement accuracy exceeds a predetermined accuracy, the virtual photo shooting position is determined as the actual photo shooting position, and a shooting position instruction indicating the photo shooting position is output. By using a photograph taken based on this instruction, variation in measurement accuracy depending on the photographing position is suppressed, and photograph measurement is performed with stable measurement accuracy (see, for example, Patent Document 1).

Japanese Patent No. 4470292

  The conventional photo measurement system requires distance measurement and angle measurement by a measuring instrument if the camera position and the camera orientation described in the photographing position instruction are precisely matched. For example, a distance measurement device is used to measure the distance from the reference point to adjust the camera position, and an angle measurement device is used to measure the angle from the reference surface to adjust the camera orientation. There was a problem that it took time to shoot.

  Also, if the camera position and camera orientation are roughly matched, the measurement object's reflection position, size, and angle are different from those that can be taken from the virtual photo shooting position, so measurement is different from the measurement accuracy during simulation. There has been a problem that the accuracy may be less than the predetermined accuracy.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a photo measurement system and a photo shooting position indication method capable of easily taking a photo while ensuring measurement accuracy. To do.

The photo measurement system of this invention is
3D model generation function unit that reads design data of a measurement object and generates a 3D model of the measurement object in a virtual 3D space;
A measurement point setting function unit for setting a measurement point for measuring the measurement object;
A shooting position alignment target setting function unit for setting a shooting position alignment target that is a determination reference of a shooting position for shooting the measurement object so as to include the measurement point;
Using the three-dimensional model, a photography position deriving function unit for deriving a plurality of the photography positions at which the measurement accuracy of the measurement points is a predetermined precision;
Using the three-dimensional model, the photographing position where the measurement object and the photographing position alignment target when the photographing object is photographed from each of the photographing positions is calculated and the photographing position alignment image is generated is calculated. A matching image generation function unit;
A photography position display function section for displaying each of the photography positions;
And a photographing position adjusting image display function unit for displaying each of the photographing position adjusting images.

Moreover, the photography position instruction method of this invention is
Read the design data of the measurement object, generate a 3D model of the measurement object in the virtual 3D space,
Set a measurement point for measuring the measurement object,
Set a target for shooting alignment to be a reference for determining a shooting position for shooting so that the measurement point of the measurement object is included,
Using the three-dimensional model, a plurality of the photography positions where the measurement accuracy of the measurement point is a predetermined accuracy are derived,
Using the three-dimensional model, calculate the photo coordinates that can be captured by the measurement object and the shooting alignment target when shooting from each of the shooting positions, respectively, to generate a shooting alignment image,
Each photography position and each photography position alignment image are displayed.

Since the photo measurement system and the photo shooting position instruction method of the present invention are configured and performed as described above,
Photography can be easily performed while ensuring measurement accuracy.

It is a conceptual diagram which shows the photograph measurement method provided with the photograph measurement system in Embodiment 1 of this invention. It is a block diagram which shows the structure of the photograph measurement system shown in FIG. It is a flowchart which shows the photography position instruction | indication method of the photography measurement system shown in FIG. It is a figure which shows the three-dimensional model of the measurement object produced in the photograph measurement system shown in FIG. It is a figure which shows the preparation procedure of the image for imaging position alignment in the photograph measurement system shown in FIG. FIG. 3 is a layout diagram showing a camera photographing position and an illumination position as a photographing position derived by the photograph measuring system in FIG. 2. It is the figure which showed the comparison with the finder image observed from the finder of the camera in the photograph measurement system in FIG. 1, and the image for imaging position alignment. It is the figure which showed the comparison with the finder image observed from the finder of the camera in the photograph measurement system in FIG. 1, and the image for imaging position alignment. It is a figure which shows the calculation procedure of the photograph coordinate of the bolt hole in the photograph measurement system in FIG. It is a flowchart which shows the photography position instruction | indication method in the photography measurement system by Embodiment 2 of this invention. It is the figure which showed the composite image in the case of the photography position instruction | indication method of the photography measurement system shown in FIG. It is the figure which showed the composite image in the case of the photography position instruction | indication method of the photography measurement system shown in FIG. It is a conceptual diagram which shows the photograph measurement method provided with the photograph measurement system by Embodiment 3 of this invention. It is a figure which shows the usage example of the mark for a measurement with the photograph measurement system shown in FIG. It is a flowchart which shows the photography position instruction | indication method with the photography measurement system shown in FIG. It is a figure which shows the three-dimensional model of the measurement object produced in the photograph measurement system shown in FIG. It is the arrangement | positioning figure which showed the photography position derived | led-out by the photograph measurement system in FIG. It is a figure which shows the calculation procedure of the photograph coordinate of the mark for a measurement in the photograph measurement system in FIG. It is a flowchart which shows the photography position instruction | indication method in the photography measurement system in Embodiment 4 of this invention.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. FIG. 1 is a conceptual diagram showing a photo measurement method provided with a photo measurement system according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing the configuration of the photo measurement system shown in FIG. FIG. 3 is a flowchart showing a method for instructing the photographing position of the photograph measuring system shown in FIG. 2 and a method for measuring a measurement object by this photographing position instruction method. FIG. 4 is a view showing a three-dimensional model of a measurement object, measurement points, and a target for photographing alignment created in the photo measurement system shown in FIG.

  FIG. 5 is a diagram showing a procedure for creating an image for position adjustment in the photo measurement system shown in FIG. FIG. 5A is a diagram showing the derived photography position in the virtual three-dimensional space. FIGS. 5B and 5D are diagrams showing virtual photographs of the measurement object that can be captured when photographed from each photograph photographing position. FIGS. 5C and 5E are diagrams showing shooting position alignment images obtained by extracting shooting position alignment targets from the virtual photographs of FIGS. 5B and 5D.

  FIG. 6 is an arrangement diagram showing the positional relationship between the camera photographing position and the illumination position and the measurement object as the photographing position derived by the photograph measuring system in FIG. FIG. 7 is a diagram showing a comparison between the finder image observed from the camera finder and the photographing position alignment image in the photograph measuring system according to the first embodiment of the present invention, and has not reached the derived photograph photographing position. It is the figure which showed the case. FIG. 8 is a diagram showing a comparison between the finder image observed from the camera finder and the image for position adjustment in the photo measurement system according to Embodiment 1 of the present invention. FIG.

  FIG. 9 is a diagram showing a procedure for calculating the photographic coordinates of the bolt holes from the photograph taken by the measurer in FIG. FIG. 9A shows a photograph taken by the measurer with a camera. FIG.9 (b) is a figure which shows the image which expanded the bolt hole of the photograph of Fig.9 (a). FIG. 9C is a diagram illustrating an image after the edge extraction process is performed on the image of FIG. FIG. 9D is a diagram showing an image obtained by calculating the center of gravity of the ellipse by the contour extraction process and the ellipse fitting process on the image of FIG. 9C.

  As shown in FIGS. 1 and 2, a photo measurement system 2 for measuring a measurement object 8 having a bolt hole 1 includes a three-dimensional model generation function unit 30, a measurement point setting function unit 31, and an imaging position alignment. Target setting function unit 32, photography position deriving function part 33, photographing position alignment image generation function part 34, photographing position display function part 35, photographing position alignment image display function part 36, and photography A function unit 37, a measurement point extraction function unit 38, and a three-dimensional coordinate calculation function unit 39 are provided.

  Then, there is a server 7 or an information medium 6 existing on the network from which the photo measurement system 2 can acquire design data of the measurement object 8, for example, three-dimensional CAD data. Further, there are a camera 4 and an illuminator 5 for photographing the measurement object 8. And the indicator 3 which displays the information from the photograph measurement system 2 exists. A photograph taken by the camera 4 is input to the photograph measurement system 2.

  Next, a photo shooting position instruction method in the photo measurement system of the first embodiment configured as described above, and a measurement object measurement method using this photo shooting position instruction method will be described with reference to FIG. First, the three-dimensional model generation function unit 30 takes in design data of the measurement object 8 from, for example, the server 7 or the information medium 6. Then, for example, as shown in FIG. 4, a three-dimensional model 10 of the measurement object 8 is generated in the virtual three-dimensional space 9 on the three-dimensional CAD and displayed on the display 3 (step S1 in FIG. 3). .

  Next, the measurer measures, for example, a circular shaped bolt hole 1 from the three-dimensional model 10 of the measurement object 8 displayed on the display 3 and measures a characteristic shape portion when measuring the measurement object 8. Instruct to select as point 11. The selected circular bolt hole 1 is set as the measurement point 11 by the measurement point setting function unit 31 (step S2 in FIG. 3). The measurement point 11 of the characteristic shape portion mentioned here is not limited to the circular bolt hole 1 as shown in FIG. 4, for example, a part, hole, or groove having a geometric shape such as a triangle or a rectangle. Or a protrusion. In addition, a non-geometric part, hole, groove, or protrusion may be used.

  Next, the measurer takes an imaging position that is a determination criterion for a photography position for imaging the measurement object 8 from the three-dimensional model 10 of the measurement object 8 displayed on the display 3 so that the measurement point 11 is included. Specify the target for alignment. Specifically, as shown in FIG. 4, the boundary line 12 between the three-dimensional model 10 of the measurement object 8 and the floor surface 40 or the contour of the surface including the measurement point 11 of the three-dimensional model 10 of the measurement object 8. The line 13 or four feature points 14a, 14b, 14c, 14d, etc. that are separated from each other in the three-dimensional model 10 of the measurement object 8 are set as shooting position alignment targets by the shooting position target setting function unit 32. (Step S3 in FIG. 3).

  Next, using the three-dimensional model 10 of the measurement object 8, the measurement points 11 are emphasized, and the camera shooting positions and the illumination positions as a plurality of photo shooting positions so that the measurement accuracy becomes a predetermined accuracy are taken. The position deriving function unit 33 derives (step S4 in FIG. 3). As a method for deriving the photographing position, the camera photographing position and the illumination position where the measurement accuracy is the best are uniquely determined for the surface having the measurement point 11 of the three-dimensional model 10 of the measurement object 8. The position is derived as the camera photographing position and the illumination position with respect to the surface on which the measurement point 11 exists. For example, if the illumination direction that emphasizes the edge of the bolt hole 1 of the measurement object 8 most, the baseline length that minimizes the measurement error, and the angle of the camera 4 are known in advance evaluation, the illumination position In addition, the camera shooting position is taken as the photo shooting position, and the result is derived.

  As another method for deriving a photo shooting position, the measurement accuracy obtained when a virtual photo shooting position is set in the virtual three-dimensional space 9 and shooting is performed from the virtual photo shooting position is greater than a predetermined accuracy set in advance. If so, the virtual photo shooting position is taken as the photo shooting position, and the result is derived. Further, if the accuracy is less than the predetermined accuracy, a method may be used in which the virtual photo shooting position is changed or the virtual photo shooting position is added until the predetermined accuracy is achieved, and repeated until the accuracy is achieved.

  The measurement accuracy referred to here is obtained from the relative three-dimensional coordinates of the measurement point 11 calculated based on the two-dimensional image showing the measurement object 8 that can be captured when taken from the virtual photography position and the design data. It is set by an error in the positional relationship between the measurement point 11 and the relative three-dimensional coordinates.

  In addition to the illumination position deriving method described above, a method of deriving an optimal illumination position for each derived camera photographing position may be used. For example, with respect to one derived camera photographing position, the surface where the measurement point 11 exists passes through the point where the optical axis of the camera 4, the optical axis of the illuminator 5, and the surface where the measurement point 11 exists intersect. When a vertical axis is used as a reference axis, there is a method of deriving an illumination position so that an angle formed by the optical axis of the camera 4 and the reference axis is equal to an angle formed by the optical axis of the illuminator 5 and the reference axis. . In this case, the illumination position is derived for each camera photographing position.

  Next, as shown in FIG. 5A, the imaging position alignment image generation function unit 34 captures images from a plurality of camera imaging positions 15 a and 15 b derived from the three-dimensional model 10 in the previous step 4. The virtual photographs 16a and 16b of the three-dimensional model 10 having the measurement points 11 that can be captured are calculated as shown in FIGS. 5B and 5D, respectively. Then, by extracting the boundary line 12, the contour line 13, or the feature points 14 a, 14 b, 14 c, and 14 d as the shooting position alignment target from the virtual photographs 16 a and 16 b, FIGS. 3 are generated (step S5 in FIG. 3).

  Next, an arrangement diagram 19 showing the positional relationship among the measurement object 8, the derived camera photographing positions 15a and 15b, and the illumination position 18 is generated by the photographing position display function unit 35, as shown in FIG. This is displayed on the display 3 (step S6 in FIG. 3). Then, the camera photographing positions 15a and 15b and the illumination position 18 are instructed to the measurer. The layout diagram 19 generated at this time may be a plan view as shown in FIG. 6, or may be a three-dimensional view unlike FIG. Furthermore, a display method as shown in FIG. 6 in which a rough positional relationship can be understood may be used, and unlike FIG. 6, a detailed distance, angle, scale, etc. may be described.

  Next, the shooting position alignment image display function unit 36 displays the shooting position alignment images 17a and 17b on the display 3 (step S7 in FIG. 3). Then, the measurer arranges the illuminator 5 and the camera 4 based on the layout diagram 19. The measurer is photographed by the actual camera 4 with the boundary line 12 or the contour line 13 or the feature points 14a, 14b, 14c, and 14d as the photographing position alignment targets of the photographing position alignment images 17a and 17b. The position of the camera 4 is adjusted and moved until the position of the boundary line 12, the contour line 13, or the feature points 14a, 14b, 14c, and 14d as the target for photographing position alignment in the photograph is matched. .

  The photograph actually taken by the camera 4 does not display the boundary line 12, the contour line 13, or the feature points 14 a, 14 b, 14 c, 14 d as the photographing position alignment target. Is verified with reference to the boundary line 12, the contour line 13, or the feature points 14 a, 14 b, 14 c, and 14 d displayed as the shooting position alignment targets shown in the shooting position alignment images 17 a and 17 b. . Since this is the same in the following embodiments, the description thereof will be omitted as appropriate.

  Specifically, as shown in FIG. 7, when the derived camera photographing position has not been reached, the position of the target for photographing position alignment of the finder image 20a observed from the finder of the camera 4 is derived. There is a difference in the position of the shooting position alignment target of the shooting position alignment image 17b at the camera shooting position 15b. The measurer moves the camera 4 so that this fits, and as shown in FIG. 8, the position of the target for photographing position alignment of the finder image 20b observed from the finder of the camera 4 and the photographing position at the derived camera photographing position 15b. The position of the target for imaging position alignment of the alignment image 17b is set to the same position.

  Next, the photograph function unit 37 captures and stores the photograph 21 (FIG. 9A) obtained by photographing the measurement object 8 with the camera 4 installed at the camera photographing position determined by the measurer (FIG. 3). Step S8). Next, the photograph coordinates of the bolt hole 1 (measurement point 11) are calculated from the photograph 21 (FIG. 9A) taken from each saved photography position (step S9 in FIG. 3).

  For example, as shown in FIG. 9B, edge extraction is performed on the photograph 21 using a Canny filter, a differential filter, or the like (FIG. 9C), and an elliptical shape is extracted by contour extraction processing and elliptic fitting processing. Then, by calculating the position of the center of gravity, the photograph coordinates of the bolt hole 1 (measurement point 11) are obtained (FIG. 9 (d)). In addition to the measurement point 11 extraction method described above, for example, the shape of the measurement point 11 that can be seen when taken from the derived camera photographing position is registered, and pattern matching is performed on the stored photograph 21. A method of calculating photographic coordinates (two-dimensional coordinates) of the measurement point 11 may be used.

  Next, the calculated photographic coordinates (two-dimensional coordinates) of the measurement points 11 are associated with each other, and the three-dimensional coordinates of each measurement point 11 are calculated by the three-dimensional coordinate calculation function unit 39 (FIG. 3). Step S10). Here, since the calculated three-dimensional coordinates of the measurement point 11 use a photograph taken based on the derived photography position, a measurement result with a predetermined accuracy can be obtained.

  According to the photograph measurement system of the first embodiment configured as described above, a photographing position that can be captured when a photographing position alignment target that easily captures perspective is set and photographing is performed from a photographing position that provides a predetermined accuracy. By displaying the alignment image and the photography position, it is possible to easily determine whether the measurer has reached an appropriate photography position. Therefore, a photograph that satisfies a predetermined accuracy can be taken.

Embodiment 2. FIG.
In the first embodiment, an example is shown in which an image for shooting position alignment is displayed and a measurer moves and adjusts the camera shooting position of the camera while looking at the viewfinder of the camera. The photographing position alignment image display function unit displays a composite image obtained by combining the photographing position alignment image with a photograph taken from the camera.

  FIG. 10 is a flowchart showing a photo shooting position instruction method of the photo measuring system according to the second embodiment of the present invention. FIG. 11 and FIG. 12 are diagrams showing a composite image of a camera photograph and a photographing position alignment image in the photograph measurement system according to the second embodiment of the present invention. FIG. 11 is a diagram illustrating a case where the camera has not reached the derived photography position. FIG. 12 is a diagram illustrating a case where the camera reaches the derived photography position. Since the configuration of the photo measurement system is the same as that of the first embodiment, description thereof will be omitted as appropriate. Moreover, the same part is demonstrated using the same code | symbol. This also applies to the following embodiments, and the description thereof will be omitted as appropriate.

  Next, a part different from the first embodiment will be described with reference to FIG. 10 regarding the photo shooting position instruction method in the photo measurement system of the second embodiment configured as described above. First, through the same steps as those in the first embodiment, the photographing position alignment image display function unit 36 displays the photographing position alignment images 17a and 17b and combines the photographs 22a and 22b captured from the camera 4 as needed. And it displays on the indicator 3 as the synthesized images 23a and 23b (step S11 in FIG. 10).

  Specifically, as shown in FIG. 11, when the derived camera photographing position has not been reached, the photograph 22a (FIG. 11 (a)) from the camera 4 and the photographing positioning image 17b (FIG. 11) are obtained. It becomes a composite image 23a (FIG. 11C) with (b)), and it can be easily determined that the derived camera photographing position has not been reached.

  Then, the measurer moves the camera 4 so as to fit the image for position adjustment 17b and shoots, and as shown in FIG. 12, the photograph 22b (FIG. 12 (a)) from the camera 4 and the position for position adjustment are shown. It becomes a composite image 23b (FIG. 12C) with the image 17b for use (FIG. 12B), and it can be easily determined that the derived camera photographing position has been reached. Therefore, for the measurer, a position where the position of the shooting position alignment target of the shooting position alignment image 17b coincides with the position of the shooting position alignment target of the photograph 22b of the camera 4 that is actually shooting. It is possible to instruct to move to the derived photography position.

Further, at this time, the degree of coincidence between the position of the shooting position alignment target of the photograph taken from the camera 4 and the position of the shooting position alignment target included in the shooting position alignment images 17a and 17b, for example, the photo coordinate position An imaging position determination function unit for calculating the difference or the scale ratio may be provided.
Then, the photographing position determination function unit adds an allowable range of coincidence to the display 3 and displays it. If the degree of coincidence is within an allowable range, it may be assumed that the optimum photography position has been reached, and displayed on the display 3 to notify the measurer. Alternatively, the measurement person may be notified by reproducing a notification sound or a voice guide.

  According to the photo measurement system of the second embodiment configured as described above, the same effect as that of the first embodiment can be obtained. By displaying the composite image at any time, the difference between the shooting alignment target of the shooting alignment image and the shooting alignment target in the photo taken from the camera is clarified, and the measurer can take appropriate photos. It can be easily determined whether or not the position has been reached.

  In addition, whether or not the measurer has reached the appropriate photo shooting position by notifying the degree of coincidence between the target for shooting positioning that appears in photos taken from the camera as needed and the target for shooting positioning of the shooting positioning image Can be easily determined.

Embodiment 3 FIG.
In each of the above embodiments, an example in which a measurement point is set on the measurement object itself has been described. However, the present invention is not limited to this, and in the third embodiment, a measurement point for measuring the measurement object. Will be described with respect to an example in which a measurement point is newly installed on the measurement object.

  FIG. 13 is a conceptual diagram showing a photo measurement method provided with a photo measurement system according to Embodiment 3 of the present invention. FIG. 14 is a diagram for explaining the configuration of the measurement points of the measurement object of the photo measurement system shown in FIG. FIG. 15 is a flowchart showing a method for instructing the photographing position of the photograph measuring system shown in FIG. 13 and a method for measuring the measurement object by this photographing position instruction method. FIG. 16 is a diagram showing a three-dimensional model of a measurement object, measurement points, and a target for photographing alignment created in the photo measurement system shown in FIG. FIG. 17 is a layout diagram showing a positional relationship between a camera photographing position as a photographing position derived by the photograph measuring system in FIG. 13 and a measurement object.

  FIG. 18 is a diagram showing a procedure for calculating the photographic coordinates of the bolt holes from the photograph taken by the measurer in FIG. FIG. 18A shows a photograph taken by the measurer with a camera. It is a figure which shows the image which expanded the bolt hole of the photograph of FIG.18 (b) and Fig.18 (a). FIG. 18C is a diagram illustrating an image after the edge extraction process is performed on the image of FIG. FIG. 18D is a diagram showing an image obtained by calculating the center of gravity of the ellipse by the contour extraction process and the ellipse fitting process on the image of FIG. Note that the configuration of the photo measurement system is the same as that of each of the above embodiments, and therefore the description thereof is omitted as appropriate.

  In FIG. 13, the same parts as those in the above embodiments are given the same reference numerals and the description thereof is omitted. In the third embodiment, an example in which the camera 4 and the illuminator 5 are integrally formed is shown. Furthermore, a fitting component 26 having a measurement mark 24 attached to the measurement object 8 is provided. The measurement mark 24 is used as a measurement point 25 instead of the characteristic shape portion of the measurement object 8.

  For example, it is a material that reflects light without directivity on a black background and is placed on a place where you want to measure a circle or the like. Therefore, as shown in FIG. 14, the measurement mark 24 is placed at a position where the measurement target 8 is to be measured by fitting the fitting part 26 with the measurement mark 24 pasted into the bolt hole 1 of the measurement target 8. doing. When such a measurement mark 24 is used as the measurement point 25, the shape of the measurement mark 24 can be emphasized without depending on the illumination position, so that the illumination position only needs to face the measurement mark 24. , No particular instructions shall be given.

  In the third embodiment, since the measurement mark 24 is the measurement point 25, the position of the illuminator 5 is less likely to be affected in taking a photograph. Therefore, in FIG. Although an example in which the camera 4 is integrated with the camera 4 is shown, the present invention is not limited to this, and can be performed in the case of an independent type as in the above embodiments.

  Next, a part different from each of the above embodiments will be described with reference to FIG. 15 regarding a photo shooting position instruction method in the photo measuring system of the third embodiment configured as described above. First, the measurement point setting function unit 31 sets the measurement mark 24 as the measurement point 25 through the same processes as those in the above embodiments (step S12 in FIG. 15). Next, as shown in FIG. 16, the measurement point setting function unit 31 further sets the approximate center position of the measurement point 25 to be measured as the temporary measurement point 27 (step S13 in FIG. 15).

  Further, through the same steps as those in the above embodiments, the photo shooting position deriving function unit 33 sets the photo shooting positions at which the measurement accuracy of the temporary measurement points 27 becomes a predetermined accuracy in the same manner as in the above embodiments. Derived (step S14 in FIG. 15). Further, through the same steps as those in the above-described embodiments, the photo shooting position display function unit 35 shows a layout diagram 28 showing the positional relationship between the derived camera shooting positions 15a and 15b and the measurement object 8 as shown in FIG. Is generated and displayed on the display 3 (step S15 in FIG. 15).

  Further, through the same steps as in the above embodiments, the measurement point extraction function unit 38 calculates the photo coordinates of the measurement mark 24 from the photo 29 taken from each photo shooting position (step S16 in FIG. 15). ). Specifically, as in the above embodiments, for example, as shown in FIGS. 18A and 18B, edge extraction is performed on the photograph 29 using a Canny filter, a differential filter, or the like (FIG. 18C )) Further, the ellipse shape is extracted by the contour extraction process and the ellipse fitting process, and the centroid position thereof is calculated to obtain the photographic coordinates of the measurement mark 24 (measurement point 25) (FIG. 18D). In addition to the method of extracting the measurement point 25 described above, for example, the shape of the measurement point 25 that can be seen when shooting from the derived camera shooting position is registered, and pattern matching is performed on the stored photograph 29. A method of calculating the photographic coordinates (two-dimensional coordinates) of the measurement point 25 may be used. Then, the measurement object 8 is measured in the same manner as in the above embodiments.

  According to the photographic measurement system of the third embodiment configured as described above, the same measurement effects as those of the above-described embodiments can be obtained. Since it can be set as a mark, it can be further easily determined whether or not the measurer has reached an appropriate photography position. Therefore, it is possible to more easily take a photo that satisfies the predetermined accuracy.

Embodiment 4 FIG.
In the above-described third embodiment, an example in which the photographing position adjustment image is displayed and the measurer moves and adjusts the camera photographing position while looking at the camera viewfinder has been shown. However, in the fourth embodiment, As in the third embodiment, a measurement mark as a measurement point is newly installed on the measurement object, and in the same manner as in the second embodiment, the shooting position is set in the shooting position adjusting image function unit. A composite image obtained by combining a photograph taken from a camera with an image for alignment is displayed.

  FIG. 19 is a flowchart showing a photo shooting position instruction method of the photo measurement system according to Embodiment 4 of the present invention. Next, a part different from the third embodiment will be described with reference to FIG. 19 regarding the photo shooting position instruction method in the photo measurement system of the fourth embodiment configured as described above. First, through the same steps as in the third embodiment, the photographing position alignment image display function unit 36 displays a photographing position alignment image and combines the photos taken from the camera 4 as needed to display as a composite image. This is displayed on the device 3 (step S17 in FIG. 19). The specific display method is the same as that in the second embodiment.

  If the measurer determines that the camera shooting position derived from the composite image has not been reached, the camera operator can determine that the camera has reached the camera shooting position derived from the composite image by moving the camera 4 and shooting. . Therefore, the measurer moves to a position where the position of the shooting position alignment target of the image for shooting position alignment matches the position of the shooting position alignment target of the photograph of the camera 4 that is actually shooting. It is possible to guide to the derived photography position.

  Furthermore, at this time, as in the second embodiment, the degree of coincidence between the position of the shooting position alignment target of the photograph taken from the camera 4 and the position of the shooting position alignment target included in the shooting position alignment image For example, a photographing position determination function unit that calculates a difference in photograph coordinate position or a scale ratio may be provided. Then, the photographing position determination function unit adds an allowable range of coincidence to the display 3 and displays it. If the degree of coincidence is within an allowable range, it may be assumed that the optimum photography position has been reached, and displayed on the display 3 to notify the measurer. Alternatively, the measurement person may be notified by reproducing a notification sound or a voice guide.

  According to the photographic measurement system of the fourth embodiment configured as described above, the same effects as those of the third embodiment can be obtained, as well as the second embodiment. By displaying the composite image of the photo and the image for image alignment at any time, the difference between the image alignment target for the image for image alignment and the image alignment target for the photo taken from the camera is clear. Thus, it is possible to easily determine whether the measurer has reached an appropriate photography position.

  In addition, whether or not the measurer has reached the appropriate photo shooting position by notifying the degree of coincidence between the target for shooting positioning that appears in photos taken from the camera as needed and the target for shooting positioning of the shooting positioning image Can be easily determined.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

1 bolt hole, 2 photo measurement system, 3 display, 4 camera, 5 illuminator,
6 Information media, 7 Server, 8 Measurement object, 9 Virtual three-dimensional space,
10 3D model, 11 measurement point, 12 boundary line, 13 contour line,
14a feature point, 14b feature point, 14c feature point, 14d feature point,
15a camera shooting position, 15b camera shooting position, 16a virtual photo,
16b Virtual photograph, 17a Image alignment image, 17b Image alignment image,
18 Illumination position, 19 Layout view, 20a Viewfinder image, 20b Viewfinder image,
21 photo, 22a photo, 22b photo, 23a composite image, 23b composite image,
24 measurement marks, 25 measurement points, 26 fitting parts, 27 temporary measurement points,
28 arrangement drawing, 29 photograph, 30 3D model generation function part,
31 measurement point setting function section, 32 shooting position alignment target setting function section,
33 Photo shooting position deriving function section 34, Image capturing function generating section for shooting position alignment,
35 Photo shooting position display function section, 36 Image display function display section for shooting position alignment,
37 photography function part, 38 measurement point extraction function part, 39 three-dimensional coordinate calculation function part, 40 floor surface.

Claims (6)

3D model generation function unit that reads design data of a measurement object and generates a 3D model of the measurement object in a virtual 3D space;
A measurement point setting function unit for setting a measurement point for measuring the measurement object;
A shooting position alignment target setting function unit for setting a shooting position alignment target that is a determination reference of a shooting position for shooting the measurement object so as to include the measurement point;
Using the three-dimensional model, a photography position deriving function unit for deriving a plurality of the photography positions at which the measurement accuracy of the measurement points is a predetermined precision;
Using the three-dimensional model, the photographing position where the measurement object and the photographing position alignment target when the photographing object is photographed from each of the photographing positions is calculated and the photographing position alignment image is generated is calculated. A matching image generation function unit;
A photography position display function section for displaying each of the photography positions;
An image display function unit for image capturing alignment for displaying each image for image capturing alignment;
Photo measurement system with The image display function unit for shooting position alignment is
The photo measurement system according to claim 1, wherein a composite image obtained by combining a photograph taken from a camera with the image for position adjustment is displayed. A shooting position determination function unit that calculates and outputs the degree of coincidence between the position of the shooting position alignment target of the photograph taken from the camera and the position of the shooting position alignment target included in the shooting position alignment image The photographic measurement system according to claim 1, further comprising: Read the design data of the measurement object, generate a 3D model of the measurement object in the virtual 3D space,
Set a measurement point for measuring the measurement object,
Set a target for shooting alignment to be a reference for determining a shooting position for shooting so that the measurement point of the measurement object is included,
Using the three-dimensional model, a plurality of the photography positions where the measurement accuracy of the measurement point is a predetermined accuracy are derived,
Using the three-dimensional model, calculate the photo coordinates that can be captured by the measurement object and the shooting alignment target when shooting from each of the shooting positions, respectively, to generate a shooting alignment image,
A photography position instruction method for displaying each photography position and each photographing position alignment image. 5. The photo shooting position instruction method according to claim 4, wherein the photo shooting position indication method is displayed as a composite image in which a photograph taken from a camera is combined with the image for position adjustment. 6. The degree of coincidence between the position of the shooting position alignment target of a photograph taken from a camera and the position of the shooting position alignment target included in the shooting position alignment image is calculated and output. Photo shooting position instruction method.

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