JP4367703B2 - Orthographic projection image forming system - Google Patents

Description

The present invention can form an image projected from directly above an object to be photographed, such as an aerial photograph without using an aircraft, for example, and is a so-called plan view that needs to be used in the civil engineering, architectural fields, etc. The present invention relates to an orthographic projection image forming system such as a side view.

  In recent years, civil engineering and building work related to renewal of building structures and the like have attracted attention, and accordingly, technical development for the purpose of renewal is desired.

  In renewal of building structures and the like, there are many cases where there are no drawings (orthographic projections) of building structures to be renewed. In such a case, the drawings of the building structures are very easy. Development of technology that can be created is desired.

Conventionally, a method and system (Japanese Patent Publication No. 2003-331259) for generating an orthographic projection image using an image obtained by aerial photography from an airplane or the like is generally known.
Japanese Patent Publication No. 2003-331259

  However, in the above-mentioned aerial photography, it is necessary to shoot with a high-precision camera, and aerial photography is also affected by the weather, and the cost is high for one flight, so the total cost is also low. However, there was a problem that would become extremely expensive.

Thus, the present invention was devised in view of the above-described conventional problems, and it is not necessary to use a high-precision camera, and it is not necessary to take an aerial photograph with an airplane, so it is not influenced by the weather and is taken The orthographic projection image can be obtained at a low cost, and the orthographic projection image can be obtained at a very low cost as a whole, and the drawing (orthographic projection diagram) of the building structure to be renewed can be obtained very easily. An object of the present invention is to provide a projection image forming system.

（数２）

（数３）

An orthographic projection image forming system according to the present invention includes:
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least 3 specified positions from multiple directions in all directions above the plane, acquire multiple image information by shooting with a digital camera from multiple points with different shooting positions,
From a plurality of image information obtained by photographing with the digital camera, three-dimensional coordinate information at at least three designated positions of the photographing object is obtained,
Obtaining image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations;
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthophoto that can be formed and includes the predetermined object in the object to be photographed and the scale of the plane including the object of known length is clear based on the three-dimensional coordinate information and image coordinate information of the object of known length A projection image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
It is characterized by
Or
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
From a plurality of image information obtained by photographing with the digital camera, three-dimensional coordinate information at at least three designated positions of the photographing object is obtained,
Obtaining image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations;
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthographic projection that can be formed and includes the predetermined object in the object to be photographed based on the three-dimensional coordinate information and the image coordinate information of the subject having the known length, and the scale of the plane including the subject having the known length is clear. Image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
It is characterized by
Or
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
From a plurality of image information obtained by photographing with the digital camera, using the collinear conditional expression shown in the following equation 1, to obtain three-dimensional coordinate information at at least three specified positions of the photographing object,
Obtaining image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations;
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthographic projection that can be formed and includes the predetermined object in the object to be photographed based on the three-dimensional coordinate information and the image coordinate information of the subject having the known length, and the scale of the plane including the subject having the known length is clear. Image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
It is characterized by
Or
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
Accurate three-dimensional coordinate information at at least three specified positions of the object to be imaged by repeatedly calculating from a plurality of pieces of image information obtained by photographing with the digital camera using the collinear conditional expression shown in the following formula 1. Get
Obtaining image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations;
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthographic projection that can be formed and includes the predetermined object in the object to be photographed based on the three-dimensional coordinate information and the image coordinate information of the subject having the known length, and the scale of the plane including the subject having the known length is clear. Image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
It is characterized by
Or
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
Accurate three-dimensional coordinate information at at least three specified positions of the object to be imaged by repeatedly calculating from a plurality of pieces of image information obtained by photographing with the digital camera using the collinear conditional expression shown in the following formula 1. And obtaining the orientation element shown in the following mathematical expression 2 of the imaging object,
The image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations is obtained from the following equation (1):
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthographic projection that can be formed and includes the predetermined object in the object to be photographed based on the three-dimensional coordinate information and the image coordinate information of the subject having the known length, and the scale of the plane including the subject having the known length is clear. Image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
It is characterized by
Or
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
Accurate three-dimensional coordinate information at at least three specified positions of the object to be imaged by repeatedly calculating from a plurality of pieces of image information obtained by photographing with the digital camera using the collinear conditional expression shown in the following formula 1. And obtaining the orientation element shown in the following mathematical expression 2 of the imaging object,
The image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations is obtained from the following equation (1):
An object having a known length, including the predetermined object, in which the RGB value corresponding to the obtained image coordinate information is obtained using the formula shown in Equation 3 below and the color of the object to be photographed is determined. An orthographic projection image of the included plane can be formed, and the predetermined object in the object to be imaged is included based on the three-dimensional coordinate information and the image coordinate information of the subject with the known length, and the subject with the known length is included. An orthographic image with a clear plane scale can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
It is characterized by this.

(Equation 1)

(Equation 2)

(Equation 3)

If the orthographic projection image forming system according to the present invention, it is not necessary to use a high-precision camera, and it is not necessary to take aerial photographs with an airplane. It is possible to obtain an orthographic projection image that is extremely inexpensive in total, and as a result, it is possible to obtain a drawing (orthographic projection diagram) of the building structure to be renewed extremely easily. .

  Hereinafter, an embodiment of an orthographic projection image forming system according to the present invention will be described.

  First, as shown in FIG. 1, for a sleeve 2 on which the magazine 3 is placed on the upper surface 1, which is an object to be photographed in the present embodiment, for example, a plurality of directions in an oblique direction (in four directions in the present embodiment). )

  Here, it is assumed that the camera used is usually a digital camera 4, and all the photographing with the digital camera 4 uses the same lens, and all the photographing is performed with a fixed focus.

  When photographing, it is desirable to include a subject with a known length in the photographed image and use the subject as length information.

  Thus, it is conceivable that the subject having a known length includes a pole having a certain length, a side measure, etc., and a part of the object to be photographed, for example, the length of a sleeve desk in this embodiment. The height and depth may be measured by other surveying equipment (such as a tape measure) and used as length information.

  Then, the focal point of the lens of the digital camera 4 is fixed, the photographing position is changed as shown in FIG. 1 with respect to the sleeve 2 as the photographing object, and a plurality of digital images 5... Are obtained.

  6, FIG. 7, FIG. 8, and FIG. 9 show the acquired digital images 5 from each direction.

Here, a general still camera can be used, but in this case, it is necessary to read the photograph (printing paper) with a scanner or the like to obtain digital image data.
Next, the plurality of photographed digital images 5 are taken into the computer 6.

  An orthographic projection image creation program is installed in the computer 6, and a desired orthographic projection image is created using the orthographic projection image creation program.

  First, the digital image 5 is captured by the orthographic projection image creation program in the computer 6, and the digital image 5 is opened on the display 9 (see FIG. 10).

  Next, click on the coordinates of a reference point on each digital image 5 on which the sleeve desk 2 as the object to be imaged is shot, that is, the coordinates of the reference point 7 (three points in FIGS. 6 to 9) with a mouse or the like. input.

  Then, three-dimensional coordinates on each digital image 5 are acquired for the reference point 7 and the measurement point 8 specified in each of the plurality of digital images 5.

  Here, the digital image 5 shown in FIGS. 6 to 9 is taken from the direction shown in FIG. 2 for the image (1) in FIG. 6, and the image (2) in FIG. 7 is taken from the direction shown in FIG. 8 is taken from the direction shown in FIG. 4, and the image (4) in FIG. 9 is taken from the direction shown in FIG.

  Then, as shown in FIG. 6 to FIG. 9, three reference points 7 are determined as “1”, “2”, and “3”, and measurement points 8 are determined as “4”, “5”, “6”, Five points “7” and “8” are determined, and the image coordinates of the reference point 7 and the measurement point 8 are acquired.

Where i is the image number and j is the coordinate number.
X ₁₁ , Y ₁₁ = 168,160
X ₁₂ , Y ₁₂ = 350,290
X ₁₃ , Y ₁₃ = −292,294
・
・
・
X ₁₇ , Y ₁₇ = ..., ...
X ₂₁ , Y ₂₁ =...
X ₂₂ , Y ₂₂ = ***, ***
・
・
・
_{X 48, Y 48 = +++,} +++ ···
In the above, rough image coordinates of X and Y are acquired for each reference point 7 and each measurement point 8.

  At this time, the photographing distance (initial value) and the focal length (initial value) of the camera are also input. Further, the photographing position (initial value) and the photographing angle (initial value) are also input.

  Each “initial value” input in the series of operations described above is an initial value for repeated calculation in the analysis, and may be a rough value.

  Next, the three-dimensional coordinates (initial values) of each reference point 7 and each measurement point 8 are input.

That is, the value of the three-dimensional coordinates for each reference point 7, for example,
Reference point (1) X ₁ , Y ₁ , Z ₁ = 0, 0, 600
Reference point (2) X ₂ , Y ₂ , Z ₂ = 400,0,600
Reference point (3) X ₃ , Y ₃ , Z ₃ = 0,600,600
As the initial value.

Next, a rough three-dimensional coordinate value for each measurement point 8, for example,
Measurement point (4) X ₄ , Y ₄ , Z ₄ = 400, 600, 600
・
・
・
Measurement point (8) X ₈ , Y ₈ , Z ₈ = ***, ***, ***
As a rough initial value.

Next, as length information,
For example,
The length between the reference point (1) and the reference point (2) is 400 mm,
Length between reference point (1) and reference point (3) 600mm
And set the initial value.

further,
Set the shooting distance to 3000mm as the initial value.

Also,
The camera position
X _{0 · i} = Image number (mm)
X ₀₁ , Y ₀₁ , Z ₀₁ = −2000, −1000, 1500
・
・
・
X ₀₄ , Y ₀₄ , Z ₀₄ = ..., ..., ...
And set the initial value.
Furthermore, the camera posture
As shown in FIG. 11, initial values are set.

  The focal length, the displacement of the principal point, and the distortion coefficient of the camera lens must be the same value for each image because the same camera and lens are used and the focal length is fixed. Is used.

That is,
Focal length C = 24 (mm)
Deviation of principal point position x _h = y _h = 0
Camera distortion coefficient k ₁ = k ₂ = k ₃ = p ₁ = p ₂ = 0
Using these values, an accurate three-dimensional coordinate of each measurement point 8 is obtained by repetitive calculation using the collinear conditional expression, that is, the expression shown in Equation 1 (see “Position Relationship between Imaging Object and Imaging Camera” in FIG. 12). And collinear conditions for overlapping images ”).

As a result, the orientation element shown in the equation 2 is obtained together with the accurate three-dimensional coordinates of each measurement point 8 by the repeated calculation.
Next, a plane to be projected and a range are set with reference to the obtained three-dimensional coordinates.
That is, when it is desired to create a projection image with the upper surface of the sleeve desk 2 as the XY plane,
The upper surface of the sleeve 2
Z = 600 mm,
X = 0 to 400 mm,
Y = 0 to 600mm can be set,
For example, if the scale is 1 mm per pixel, the X axis is the horizontal direction, and the Y axis is the vertical direction, an image of 400 × 600 pixels can be created.
Therefore, the color corresponding to each pixel of the 400 × 600 image, that is, the RGB value, using the collinear conditional expression shown in Equation 1 and the coefficient (orientation element) obtained by the above calculation. Are extracted from each captured image.

FIG. 13 shows an orthographic projection image of the upper surface of the sleeve 2 to be created. The image coordinates designated on the image are (X, Y) = (200, 200: units are pixels),
The three-dimensional coordinates are (X, Y, Z) = (200, 200, 600: unit is mm).

  Next, the image coordinates x and y of the captured image (1) corresponding to the three-dimensional coordinates are obtained using the collinear conditional expression shown in Equation 1.

Then, the corresponding image coordinates in the captured image (1) are
(X ₁ , y ₁ ) = (− 33.4, 313.7: unit pixel)
It becomes.

  Here, RGB values corresponding to the coordinates are extracted.

That is, four points near the corresponding image coordinates (−33.4, 313.7), that is, as shown in FIG.
(X, y) = (− 34, 313: unit pixel),
(X + 1, y) = (− 33, 313: unit pixel),
(X, y + 1) = (− 34, 314: unit pixel),
(X + 1, y + 1) = (− 33, 314: unit pixel),
The color is determined from the four RGB values (colors: red, green and blue, 0 to 255 respectively).
That is, the “linear interpolation method” using the equation shown in Equation 3 is used to determine the color (see FIG. 15).
Therefore, this process is performed over the entire range (400 × 600: unit pixel), and an orthographic projection image is created.

  Various measurements can be performed using the orthographic projection image formed according to the present invention.

  That is, since the created orthographic projection image is similar to the object to be photographed and is created at the set scale, the size and area can be measured by the number of pixels and the scale.

16 and 17 show specific examples. In FIG. 16, the vertical width of the magazine 3 is measured to be 297.63 mm from the number of pixels between two points × scale, and in FIG. It is measured as 62337.00 mm <2> from the number of pixels in the range surrounded by the point x reduced scale.

According to the orthographic projection image forming system according to the present invention, it is possible to easily obtain a planar image of a site excavated site, to easily make a drawing of furniture, an electrical product, a work of art, a human body, etc. It is also possible to create crack investigation materials.

It is explanatory drawing explaining the state which image | photographs the sleeve desk which is an imaging | photography object from several directions. It is explanatory drawing (the 1) explaining an imaging | photography direction. It is explanatory drawing (the 2) explaining an imaging | photography direction. It is explanatory drawing (the 3) explaining an imaging | photography direction. It is explanatory drawing (the 4) explaining an imaging | photography direction. It is the acquired digital image (the 1). ) It is the acquired digital image (the 2). ) It is the acquired digital image (the 3). ) It is the acquired digital image (the 4). ) It is explanatory drawing of the state which connected the digital camera and the computer. It is explanatory drawing explaining the numerical value of the "camera attitude | position" of a rating element. It is explanatory drawing explaining the collinear conditions of the positional relationship of an imaging target object and an imaging camera, and an overlapping image. It is explanatory drawing explaining the orthographic projection image of the upper surface of the sleeve desk 2 which should be produced. It is explanatory drawing (the 1) explaining the state which acquires the RGB value of the image coordinate made into object from the RGB value of 4 points | pieces. It is explanatory drawing (the 2) explaining the state which acquires the RGB value of the image coordinate made into object from the RGB value of 4 points | pieces. It is explanatory drawing explaining the state which measured the vertical width of the magazine using the formed orthographic projection image. It is explanatory drawing explaining the state which measured the area of the magazine using the formed orthographic projection image.

1 Magazine Top View 2 Sleeve Desk 3 Magazine 4 Digital Camera 5 Digital Image 6 Computer 7 Reference Point 8 Measurement Point 9 Display

Claims (6)

A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least 3 specified positions from multiple directions in all directions above the plane, acquire multiple image information by shooting with a digital camera from multiple points with different shooting positions,
From a plurality of image information obtained by photographing with the digital camera, three-dimensional coordinate information at at least three designated positions of the photographing object is obtained,
Obtaining image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations;
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthophoto that can be formed and includes the predetermined object in the object to be photographed and the scale of the plane including the object of known length is clear based on the three-dimensional coordinate information and image coordinate information of the object of known length A projection image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
An orthographic projection image forming system characterized by that.
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
From a plurality of image information obtained by photographing with the digital camera, three-dimensional coordinate information at at least three designated positions of the photographing object is obtained,
Obtaining image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations;
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthographic projection that can be formed and includes the predetermined object in the object to be photographed based on the three-dimensional coordinate information and the image coordinate information of the subject having the known length, and the scale of the plane including the subject having the known length is clear. Image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
An orthographic projection image forming system characterized by that.
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
From a plurality of image information obtained by photographing with the digital camera, using the collinear conditional expression shown in the following equation 1, to obtain three-dimensional coordinate information at at least three specified positions of the photographing object,
Obtaining image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations;
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthographic projection that can be formed and includes the predetermined object in the object to be photographed based on the three-dimensional coordinate information and the image coordinate information of the subject having the known length, and the scale of the plane including the subject having the known length is clear. Image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
An orthographic projection image forming system characterized by that.
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
Accurate three-dimensional coordinate information at at least three specified positions of the object to be imaged by repeatedly calculating from a plurality of pieces of image information obtained by photographing with the digital camera using the collinear conditional expression shown in the following formula 1. Get
Obtaining image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations;
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthographic projection that can be formed and includes the predetermined object in the object to be photographed based on the three-dimensional coordinate information and the image coordinate information of the subject having the known length, and the scale of the plane including the subject having the known length is clear. Image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
An orthographic projection image forming system characterized by that.
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
Accurate three-dimensional coordinate information at at least three specified positions of the object to be imaged by repeatedly calculating from a plurality of pieces of image information obtained by photographing with the digital camera using the collinear conditional expression shown in the following formula 1. And obtaining the orientation element shown in the following mathematical expression 2 of the imaging object,
The image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations is obtained from the following equation (1):
An orthographic projection image of a plane including the predetermined object and a subject having a known length, in which the RGB value corresponding to the obtained image coordinate information is acquired and the color of the object to be photographed is determined , is included. An orthographic projection that can be formed and includes the predetermined object in the object to be photographed based on the three-dimensional coordinate information and the image coordinate information of the subject having the known length, and the scale of the plane including the subject having the known length is clear. Image can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
An orthographic projection image forming system characterized by that.
A photographing object including a predetermined object and having a plane including a subject having a known length , toward the plane including the predetermined object and the subject having a known length of the photographing object , Specify at least three specified positions from multiple directions in all directions above the plane , change the shooting position to fix the focal length from multiple points, and acquire multiple image information by shooting with a digital camera with the same lens And
Accurate three-dimensional coordinate information at at least three specified positions of the object to be imaged by repeatedly calculating from a plurality of pieces of image information obtained by photographing with the digital camera using the collinear conditional expression shown in the following formula 1. And obtaining the orientation element shown in the following mathematical expression 2 of the imaging object,
The image coordinate information on the image information corresponding to the three-dimensional coordinate information at the specified positions of at least three locations is obtained from the following equation (1):
An object having a known length, including the predetermined object, in which the RGB value corresponding to the obtained image coordinate information is obtained using the formula shown in Equation 3 below and the color of the object to be photographed is determined. An orthographic projection image of the included plane can be formed, and the predetermined object in the object to be imaged is included based on the three-dimensional coordinate information and the image coordinate information of the subject with the known length, and the subject with the known length is included. An orthographic image with a clear plane scale can be formed,
From the formed orthographic projection image, the dimension and area of the predetermined object in a plane including the predetermined object in the object to be photographed and including the subject of known length can be measured.
Orthogonal projection image forming system characterized by

Images