JP4385796B2 - Mobile communication terminal with camera and height measurement method using mobile communication terminal with camera - Google Patents

Description

  The present invention relates to a mobile communication terminal, and more particularly, to a subject height measuring method using a camera-equipped mobile phone terminal.

  At present, in mobile communication terminals, especially mobile phone terminals, in addition to the data communication function for connecting to the Internet, so-called "mobile phones with cameras" that have built-in digital still camera functions are the mainstream, and the built-in digital still cameras The performance of the system has also become highly functional.

On the other hand, conventionally, a digital still camera that can measure the size of a subject and a measurement method using the same have been proposed (Patent Documents 1 and 2). The digital still cameras proposed for these use the active method as the autofocus method. This is a system that has distance measuring means such as sending infrared rays to a subject, detecting reflection from the subject, and determining the distance to the subject, and performing focus adjustment based on the obtained distance. . In the conventional dimension measuring method, the distance from the subject obtained by the distance measuring means used in the active method is also used for measuring the height of the subject. Further, triangulation using a digital still camera, a tripod, a level, and a distance measuring device has been conventionally performed.
JP-A-5-153468 JP 2000-121360 A

  However, a method for measuring the height of a subject using a mobile communication terminal with a camera typified by a mobile phone terminal with a camera has not been proposed.

  In mobile communication terminals such as camera-equipped mobile phone terminals, pan-focus cameras that do not have an autofocus function are the mainstream. Some top-of-the-line models have an autofocus function, but this method detects the contrast of the image obtained with an image sensor such as a CCD (Charge Coupled Devices) and adjusts the positional relationship between the image sensor and the lens. This is a contrast detection method, and does not have a distance measuring means like the active method described above. For this reason, a conventional method using a distance measuring unit cannot be applied to a mobile communication terminal such as a camera-equipped mobile phone terminal.

  In addition, since conventional triangulation requires a lot of equipment and advanced surveying technology, it cannot be used easily by those who do not have specialized knowledge. Mobile communication terminals such as mobile phone terminals with cameras It is not something that users can easily measure.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a camera-equipped mobile communication terminal that can easily measure the height of a subject without requiring special measurement equipment. And

  The height measurement method according to the present invention calculates the height of the measurement object based on the level information for detecting that it is substantially level with the ground surface, the image captured by the built-in camera, and the distance information between the measurement object. This is a height measurement method for measuring the height of an object to be measured using a camera-equipped mobile communication terminal equipped with a height calculation means. Thereby, height measurement can be easily performed using only a mobile communication terminal with a camera, without using a distance measuring device to the measurement object or a measurement device such as a tripod.

  The height calculation means in the above-described height measurement method is preferably calculated based on imaging obtained at at least two measurement points with different distances to the measurement object.

  Further, the mobile communication terminal with a camera in the above-described height measuring method is a terminal having data communication means, and information necessary for calculating the height of the measurement object obtained at a plurality of measurement points is stored in the data You may exchange by a communication means. Thereby, height measurement can be implemented in a short time.

  Furthermore, the camera-equipped mobile communication terminal in the above-described height measurement method is a mobile communication terminal having position information acquisition means for acquiring the current position of the terminal, and obtained from the position information acquired by the position information acquisition means. The distance to the measurement object to be measured may be used for calculating the height of the measurement object. Thereby, height measurement can be carried out easily in a shorter time.

  On the other hand, the mobile communication terminal according to the present invention is equipped with a camera having a level that determines that the surface is substantially horizontal with the surface of the Tsukiji, and a height calculation unit that calculates the height of the measurement object from the image captured by the built-in camera. It is a mobile communication terminal. With such a configuration, it is possible to realize height measurement that does not require a measuring device such as a distance measuring device or a tripod to the measurement object.

  The above-described mobile communication terminal preferably further includes an auto shutter that takes a picture with the built-in camera in response to detecting that the level is substantially horizontal with the ground surface. Thereby, more accurate height measurement can be realized.

  Further, the height calculation means in the mobile communication terminal described above may be configured to calculate the height of the measurement object by obtaining the pixel size of the measurement object from the number of pixels captured by the built-in camera.

  Furthermore, the above-described mobile communication terminal may further include image recognition means for detecting the contour or end point of the measurement object being imaged.

  According to the present invention, it is possible to provide a height measuring method for easily measuring the height of an object in a short time using a mobile communication terminal with a camera and a mobile communication terminal with a digital camera for height measurement.

Embodiment 1 of the Invention
FIG. 1 shows a configuration of a mobile communication terminal with a camera according to a first embodiment of the present invention. In this embodiment, a mobile phone terminal with a camera is shown as an example of a mobile communication terminal with a camera.

  The camera-equipped mobile phone terminal according to the present embodiment is based on the imaging by the camera unit in addition to the voice call unit, the data communication unit, the camera unit, and the like that the conventional camera-equipped mobile phone terminal has. An image processing unit that performs an operation for calculating the height of the measurement object, a level that detects that the object is substantially horizontal with the ground surface, and an auto shutter are provided. Hereinafter, each part will be described.

  First, each unit having functions equivalent to those of a conventional mobile phone terminal will be described. The central control unit 10 is a functional unit that controls the entire mobile phone terminal 1. The storage unit 11 is a memory for storing a telephone directory, mail address, image data, and the like. The wireless communication unit 12 is a part responsible for voice / data wireless communication, and includes a wireless communication control unit, a modulation / demodulation circuit, a transmission unit, a reception unit, and an antenna. The voice call unit 13 includes a voice call control unit that controls incoming and outgoing calls, a codec that performs A / D conversion of a voice signal, a speaker, and a microphone. The data communication unit 14 performs control necessary for Internet connection. The operation unit 15 includes an operation button and an operation control unit that controls button input. The display unit 16 includes an LCD (liquid crystal display) and a display control unit that controls LCD display.

  The camera unit 17 is a so-called digital still camera. As shown in FIG. 2, the camera unit 17 includes a lens 171 that is a normal optical lens, a photodiode, and a semiconductor element such as a CMOS (Complementary Metal Oxide Semiconductor) or a CCD. An image sensor 172 that converts and amplifies the signal into an electric signal, and a signal processing unit that converts an analog signal obtained by the image sensor 172 into a digital signal and performs image processing using the digital signal as a digital image signal. Here, the lens 171 and the image sensor 172 are arranged so that their optical axes coincide.

  Next, each part of the image processing unit 18, the level 19, and the auto shutter 20, which are features of the cellular phone terminal 1 according to the present embodiment, will be described. The image processing unit 18 receives the designation of the end point of the measurement object in the captured image by the operator, or automatically recognizes the upper and lower end points of the measurement object in the captured image, on the image sensor. The process of calculating the height of the image of the measurement object determined at the end point is performed. In order to obtain the end point of the measurement object, for example, an image may be displayed on the LCD and acquired by receiving the end point designation by the operator via the operation button of the operation unit 15. The end point of the measurement object may be automatically acquired by analyzing the contrast of the captured image and detecting the contour. Further, the image processing unit 18 performs a calculation for calculating the height of the measurement object itself based on the principle of the height calculation described later.

  The level 19 detects that at least the optical axis of the lens 171 is horizontal or substantially horizontal with respect to the ground surface, and outputs a detection signal when it is detected that the optical axis is horizontal or substantially horizontal. Have means. In addition, the camera unit 17 and the level 19 correspond to the fact that the level 19 detects a substantially horizontal state with respect to the ground surface, and the optical axis of the imaging system from the lens 171 to the image sensor 172 in the camera unit 17 is It is configured to be substantially horizontal with the ground surface. Note that a total reflection mirror is disposed between the lens 171 and the image sensor 172 due to the size limitation of the camera unit 17, and the light incident from the lens is reflected by the total reflection mirror and then imaged by the image sensor 172. If the lens 171 and the image sensor 172 are not linearly arranged, the state where the lens 171 stands substantially perpendicular to the ground surface corresponds to the substantially horizontal state detected by the level 19. Good.

  The auto shutter 20 is an electronic shutter mechanism that instructs the camera unit 17 to start / end charge accumulation in the image sensor 171 in response to a notification from the level 19.

Next, the principle of the height measurement method using the camera-equipped mobile phone terminal according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 2A shows a case where the measurement object is photographed from a certain measurement position (referred to as a first measurement position). Here, the distance from the lens 171 provided in the camera unit 17 of the mobile phone terminal 1 to the measurement object 30 is D (unknown), the height is H (unknown), and the distance from the lens 171 to the image sensor 172 is d ( Known), and the height of the image of the measuring object 30 obtained by the image sensor 172 is h1 (known). Here, since the aperture mounted on the camera unit 17 of the camera-equipped mobile phone terminal has a small diameter, it can be considered as a pinhole optical system, and Equation (1) is approximately established.
H / h1 = D / d (1)
d is known in advance as a dimension inside the camera, and h1 is a value obtained by calculating from the dimension of the image sensor 172 and the end point position of the image of the measured measurement object.

On the other hand, FIG. 2B shows a case where the distance from the measurement object is taken from a second measurement position that is different from the first measurement position by L. In this case, Equation (2) is established.
H / h2 = (D + L) / d (2)
Here, h2 is the height of the image of the measurement object obtained by the image sensor 172. Similarly to the case of FIG. 2A, d is known in advance as a dimension inside the camera, and h2 is obtained by calculating from the dimension of the image sensor 172 and the vertex position of the image of the measured object to be measured. it can.
From Expression (1) and Expression (2), the height H of the measurement object is given by Expression (4).
D = h2 / (h1-h2) × L (3)
H = h1 * h2 / (h1-h2) * L / d (4)
If h1, h2, and L are known, the height of the measurement object can be known from Equation (4).

In actual photographing, it is desirable that the height measurement can be performed regardless of the difference in height between the lower end of the measurement object 30 and the camera unit 172 from the ground surface. FIG. 3 shows a case where the lower end of the measurement object 30 and the height from the ground surface of the imaging system (lens 171 to imaging element 172) in the camera unit 17 do not match. Here, h11 and h12 are the height of the measurement object on the image sensor 172 when imaged from the first measurement position, h11 is the height from the center of the image sensor 172 to the lower part, and h12 is the image sensor 172. The height from the center of the top. The height H of the measurement object in this case can be expressed by equation (5) instead of equation (1).
H = D × (h11 + h12) / d (5)
Similarly, assuming that the height of the lower part of the measurement object on the image sensor 8 when the image is taken from the second measurement position is h21 and the height of the lower part is h22, the height H of the measurement object is expressed by the equation (4). ) And can be expressed by equation (6).
H = (h11 + h12) × (h21 + h22) / (h11 + h12−h21−h22) × L / d (6)

  In the image processing unit 18 of the camera-equipped mobile phone terminal 1 according to the present embodiment, first, on the image sensor, based on the imaging of the measurement object obtained at the first measurement point and the second measurement point. Heights h11, h12, h21, and h22 are calculated. At this time, the size of the image sensor 172 may be held in advance and calculated from the relative position of the end point of the measurement object on the image sensor 172. Next, based on the obtained h11, h12, h21, h22 and the separately input distance L, the height of the measurement object is calculated by the above-described equation (6). In addition, when the distance D between the first measurement point and the measurement object is obtained, the height of the measurement object is calculated by Expression (5) using h11 and h12 obtained at the first measurement point. It is good.

  In order to hold the above-described principle, the optical axis of the imaging system from the lens 171 to the imaging device 172 in the camera unit 17 built in the mobile phone terminal 1 is horizontal with respect to the ground surface (or the measurement object and the measurement object). It is desirable to shoot with the optical axis kept vertical. In the camera-equipped mobile phone terminal 1 according to the present embodiment, the auto shutter 20 automatically captures images when the level 19 detects a substantially horizontal state, so that it is possible to easily perform capture in a state where the above principle holds. . The height measuring method according to the embodiment of the present invention will be described below.

  First, the measurer has the camera-equipped mobile phone terminal 1 in a state where the camera-equipped mobile phone terminal 1 is directed to the measurement object from the first measurement position and the measurement object is stored in the field of view of the camera unit 17. While checking the display on the LCD, the angle of the mobile phone terminal 1 is adjusted so that the optical axis of the camera unit 17 is substantially horizontal (substantially perpendicular to the subject) with respect to the ground. In the mobile phone 1, the level 19 detects that the angle is adjusted by the measurer and is approximately level with the ground surface, and sends a detection signal to the auto shutter 20, and the auto shutter 20 operates using this detection signal as a trigger. To automatically shoot. As a result, the optical axis connecting the lens 171 of the camera unit 17 to the image sensor 172 becomes substantially horizontal with respect to the ground surface (or the measurement object 30 and the optical axis are substantially perpendicular) without using special equipment. Shooting can be performed automatically at the timing.

  The operator designates the upper end and the lower end of the measurement object in the automatically captured image. This designation may be made while the operator looks at the image displayed on the LCD of the operation unit 16, or the image processing unit 18 analyzes the contrast of the captured image and automatically detects the end point of the measurement object. It may be configured. When the upper end and lower end of the measurement object are specified, the image processing unit 18 calculates h11 and h12 from the upper end and lower end of the specified measurement object.

  Next, the measurer points the mobile phone terminal 1 toward the measurement object from the second measurement position, and performs imaging in the same procedure as the imaging from the first measurement position described above. In the mobile phone terminal 1, the image processing unit 18 calculates h 21 and h 22 from the captured image of the measurement object.

  Finally, the measurer inputs the distance difference L from the measurement object 30 at the first measurement position and the second measurement position to the mobile phone terminal 1. Thereby, in the image processing unit 173 of the mobile phone terminal 1, Expression (4) or Expression (6) is obtained based on the input distance L, the first measurement position, and the measurement result at the first measurement position. Based on this, a height calculation process is performed to obtain the height H of the measurement object.

  With the above measurement method, it is possible to easily perform height measurement using only a mobile phone terminal with a camera, without using a measuring device such as a distance measuring device to a measurement object or a tripod.

Embodiment 2 of the Invention
The embodiment of the present invention exchanges the results of height measurement at two or more points using the data communication function of the camera-equipped mobile phone terminal 1 in the measurement method described in the first embodiment of the present invention. It is characterized by doing. A height measurement method using the data communication function according to the present embodiment will be described below.

  First, the first measurer performs imaging similar to that of the first embodiment of the invention at the first measurement position, and obtains h11 and h12 which are heights of the measurement object on the image sensor 172. On the other hand, the second measurer performs photographing similar to that of the first embodiment of the invention from the second measurement value, and obtains h21 and h22 from the photographed image of the measurement object.

  Further, in the present embodiment, the second measurer transmits the values of h21 and h22 to the first measurer using the data communication function of the mobile phone terminal 1. This transmission is performed by, for example, sending the first measurer's address by e-mail to the first measurer via the packet switching network of the mobile phone operator.

  Finally, the first measurer inputs the distance difference L from the measurement object 30 at the first measurement position and the second measurement position to the mobile phone terminal 1. In the image processing unit 18 of the mobile phone terminal 1, based on the input distance L, h11 and h12 measured by the first measurer itself, and measurement results h21 and h22 received from the second measurer, By performing the height calculation process based on Expression (6), the height H of the measurement object is obtained.

  Thereby, compared with the case where one measurer measures at two measurement positions, height measurement can be performed in a short time.

Embodiment 3 of the Invention
In the measurement method according to the first embodiment and the second embodiment of the present invention, the embodiment of the present invention uses the position information detection function of the mobile phone terminal 1 to obtain a distance necessary for the measurement. It is a feature. The position information detection function is based on a method of receiving a radio wave from a GPS (Global Positioning System) satellite and determining the longitude and latitude to perform positioning, a method of performing positioning using a radio wave from a base station, and the like. This function specifies the current position of These functions are realized by incorporating a GPS receiving unit that receives GPS satellite radio waves into the mobile phone terminal 1. Below, the height measuring method using the positional information concerning this Embodiment is demonstrated.

  The first measurer performs imaging similar to that of the first embodiment of the invention at the first measurement position, and obtains h11 and h12 which are the heights of the measurement object on the image sensor 172. Furthermore, the first measurer acquires position information using the position information detection function of the mobile phone terminal 1. On the other hand, the second measurer also performs imaging similar to that of Embodiment 1 from the second measurement position, and obtains h21 and h22 from the captured image of the measurement object. Further, the second measurer uses the position information detection function of the mobile phone terminal 1 to acquire position information.

  Next, the second measurer transmits the calculated values of h21 and h22 and position information to the first measurer using the data communication function of the mobile phone terminal 1. This transmission is performed by, for example, sending the first measurer's address by e-mail to the first measurer via the packet switching network.

  Finally, in the image processing unit 182 of the mobile phone terminal 1 of the first measurer, the distance L calculated from the position information of the first measurer and the second measurer and h11 measured by the first measurer itself. , H12 and the measurement result h21, h22 received from the second measurer, the height H of the measurement object is obtained by performing the height calculation process based on the equation (6).

  Further, the second measurer may be located at the measurement object and transmit position information to the first measurer therefrom. According to this method, the first measurer obtains the distance D to the measurement object from his own position information and the position information of the second measurer, and based on this distance D and his own measurement results h11 and h12. In addition, the height of the measurement object can be calculated based on the equation (5).

  Furthermore, in the mobile phone terminal 1 possessed by the first measurer, the location information of the measurement object is acquired from the map information received by the mobile phone terminal 1 and the location information obtained by the location detection function and the measurement target The distance D to the measurement object may be calculated from the position information of the object. According to this method, the height of the measurement object can be calculated based on the equation (5) by the first measurer alone.

  Thereby, the distance from the measurement object to the measurement position or the distance between the two measurement positions can be easily obtained, and the height measurement can be easily performed in a shorter time.

Embodiment 4 of the Invention
In the first to third embodiments of the present invention described above, the processing in the image processing unit 182 that calculates the heights h11, h12, h21, and h22 of the measurement object on the image sensor is the number of pixels of the image sensor 172 (pixels). The number may be calculated using (number).

FIG. 4 shows an image 51 of the measurement object 30 at the first measurement position displayed on the LCD 50 of the mobile phone terminal. Here, C11 is the number of pixels in the lower part from the image center of the imaging 51 of the measurement object, and C12 is the number of upper pixels.
When the height per pixel of the image sensor 172 is P, h11 and h12 in Expression (6) are
h11 = C11 × P (7)
h12 = C12 × P (8)
It can be expressed as. The image processing unit 182 performs processing for calculating the number of pixels C11 and C12 from the upper end to the lower end of the measurement object in the captured image and calculating the height of the measurement object on the image sensor 8. Similarly, the heights h21 and h22 of the measurement object on the image sensor 8 at the second measurement position can also be calculated. If the height P per pixel of the image sensor 172 is stored in advance in the mobile phone terminal 1 as a value obtained from the number of pixels per side of the image sensor 172 and the length of one side of the image sensor 8. Good.

Other embodiments.
In the above-described embodiment of the invention, the case where the height measurement is performed from two points has been described, but the measurement may be performed from three or more measurement positions. Measurement accuracy can be improved by taking the average of the height measurement results at three or more points.

  In the embodiment of the invention described above, the cellular phone terminal having an auto shutter has been illustrated and described. However, a cellular phone terminal having a level and not having an auto shutter may be used. In this case as well, the operator can be notified of the timing at which the level in the mobile phone terminal detects a substantially horizontal level with the ground surface, and the operator can manually shoot at that time to obtain the necessary shot image. Therefore, height measurement can be easily performed using only a camera-equipped mobile phone terminal without using a measuring device such as a distance measuring device to a measurement object or a tripod.

  In addition, when the accuracy of height measurement is not required, a mobile phone terminal that does not have a level in addition to the auto shutter and can calculate the height in the image processing unit may be used. Thereby, height measurement can be easily performed with a camera-equipped mobile phone terminal having a simple configuration.

  In the embodiment of the invention described above, the height measurement method using the camera-equipped mobile phone terminal has been described. However, the height measurement method according to the present invention does not require a voice call function, and thus has a digital camera function. It is obvious that the height measurement according to the present invention can be performed using another mobile communication terminal.

1 is a structural diagram of a camera-equipped mobile phone terminal according to the present invention. It is a conceptual diagram which shows the principle of the height measuring method concerning this invention. It is a conceptual diagram which shows the principle of the height measuring method concerning this invention. It is a figure of the picked-up image displayed on LCD of a mobile telephone terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile phone terminal with camera 14 Data communication part 17 Camera part 171 Lens 172 Image sensor 18 Image processing part 19 Level 20 Auto shutter

Claims (10)

A camera-equipped mobile communication terminal comprising: a lens; an imaging element whose optical axis matches the lens; and an image processing unit that processes imaging information generated by the imaging element.
The mobile communication terminal,
A level for detecting that the optical axis of the lens is substantially horizontal with the ground surface ;
An auto shutter for taking a picture with the image sensor in response to detecting that the level is substantially horizontal with the ground surface;
Further comprising
Wherein the image processing unit, (a) different from the first and second of the distance measurement object Te state smell optical axis is detected and the ground surface substantially a horizontal of the lens by the spirit level from the measurement object the height information on the image pickup element of the image of the measuring object contained in the first and second sensing information obtained by shooting in the second photographing point, between the imaging element and (b) the lens And (c) the difference in distance from the measurement object between the first and second imaging points, and the distance between the measurement object and the first imaging point and the by solving the simultaneous equations for the height of the measurement object and unknowns, the height camera mobile communication terminal Ru comprising a calculating means for calculating the measurement object. The mobile communication terminal with a camera according to claim 1, wherein the height calculation unit obtains a height of the image of the measurement object on the image sensor from the number of pixels in the image sensor. The mobile communication terminal with a camera according to claim 1, wherein the image processing unit further includes an image recognizing unit that detects an outline or an end point of the image of the measurement object during imaging taken by the imaging element. A camera-equipped mobile communication terminal comprising: a lens; an imaging element whose optical axis matches the lens; and an image processing unit that processes imaging information generated by the imaging element.
This mobile communication terminal
A level for detecting that the optical axis of the lens is substantially horizontal with the ground surface;
Receiving means for receiving imaging information transmitted from another camera-equipped mobile communication terminal;
Further comprising
The image processing unit includes: (a) first and second measuring objects having different distances from the measuring object in a state where the optical level of the lens is detected to be substantially horizontal with the ground surface by the level. Height information on the image sensor of the image of the measurement object included in the first and second image information obtained by shooting at the shooting point, (b) between the lens and the image sensor The distance between the measurement object and the first imaging point and the measurement using a distance, and (c) a difference in distance from the measurement object between the first and second imaging points. A calculation means for calculating the height of the measurement object by finding a solution of simultaneous equations with the height of the object as an unknown,
The camera-equipped mobile communication terminal, wherein the first imaging information is obtained in a mobile communication terminal of the mobile communication terminal, and the second imaging information is received from the other mobile communication terminal with a camera by the receiving unit. A camera-equipped mobile communication terminal comprising: a lens; an imaging element whose optical axis matches the lens; and an image processing unit that processes imaging information generated by the imaging element.
This mobile communication terminal
A level for detecting that the optical axis of the lens is substantially horizontal with the ground surface;
Position information acquisition means for acquiring position information of the mobile communication terminal;
Further comprising
The image processing unit includes: (a) first and second measuring objects having different distances from the measuring object in a state where the optical level of the lens is detected to be substantially horizontal with the ground surface by the level. Height information on the image sensor of the image of the measurement object included in the first and second image information obtained by shooting at the shooting point, (b) between the lens and the image sensor The distance between the measurement object and the first imaging point and the measurement using a distance, and (c) a difference in distance from the measurement object between the first and second imaging points. A calculation means for calculating the height of the measurement object by finding a solution of simultaneous equations with the height of the object as an unknown,
A mobile communication terminal with a camera, wherein a difference in distance from the measurement object between the first and second imaging points is obtained based on position information acquired by the position information acquisition means. A lens, an imaging device whose optical axis coincides with the lens, an image processing unit that processes imaging information generated by the imaging device, and a level for detecting that the optical axis of the lens is substantially horizontal with the ground surface A method for measuring the height of an object to be measured using a mobile communication terminal with a camera equipped with a device,
Detecting at a first photographing point that the optical axis of the lens is substantially horizontal with the ground surface by the level;
A first imaging step of imaging the measurement object in a state where the optical axis of the lens is substantially horizontal to the ground surface at the first imaging point;
Detecting at a second shooting point that the optical axis of the lens is substantially horizontal with the ground surface by the level;
A second imaging step of imaging the measurement object in a state where the optical axis of the lens is substantially horizontal to the ground surface at a second imaging point;
(A) Height information on the image sensor of the image of the measurement object included in the first and second imaging information obtained by imaging at the first and second imaging points, (b) the lens And the imaging element, and (c) a difference in distance from the measurement object between the first and second imaging points, the measurement object and the first imaging point. Calculating the height of the measurement object by finding a solution of simultaneous equations with unknown distance between the distance and the height of the measurement object,
  In the first and second imaging steps, measurement is performed automatically in response to detecting that the spirit level is substantially horizontal with the ground surface. Method. The height of the measurement object according to claim 6, wherein in the step of calculating the height of the measurement object, the height of the image of the measurement object on the image sensor is obtained from the number of pixels in the image sensor. Measuring method. The height information of the image of the measurement object on the image sensor is acquired by detecting a contour or an end point of the image of the measurement object during imaging taken by the image sensor. The measuring method of the height of the measuring object according to claim 6. A lens, an imaging device whose optical axis coincides with the lens, an image processing unit that processes imaging information generated by the imaging device, and a level for detecting that the optical axis of the lens is substantially horizontal with the ground surface A method for measuring the height of an object to be measured using a mobile communication terminal with a camera equipped with a device,
Detecting at a first photographing point that the optical axis of the lens is substantially horizontal with the ground surface by the level;
A first imaging step of imaging the measurement object in a state where the optical axis of the lens is substantially horizontal to the ground surface at the first imaging point;
Detecting at a second shooting point that the optical axis of the lens is substantially horizontal with the ground surface by the level;
A second imaging step of imaging the measurement object in a state where the optical axis of the lens is substantially horizontal to the ground surface at a second imaging point;
(A) Height information on the image sensor of the image of the measurement object included in the first and second imaging information obtained by imaging at the first and second imaging points, (b) the lens And the imaging element, and (c) a difference in distance from the measurement object between the first and second imaging points, the measurement object and the first imaging point. Calculating the height of the measurement object by finding a solution of simultaneous equations with unknown distance between the distance and the height of the measurement object,
The photographing at the first photographing point and the photographing at the second photographing point are executed by different mobile communication terminals with cameras, and the height of the measurement object is based on the imaging information generated by the respective mobile communication terminals with cameras. A method for measuring the height of an object to be measured, characterized in that A lens, an imaging device whose optical axis coincides with the lens, an image processing unit that processes imaging information generated by the imaging device, and a level for detecting that the optical axis of the lens is substantially horizontal with the ground surface A method for measuring the height of an object to be measured using a mobile communication terminal with a camera equipped with a device,
Detecting at a first photographing point that the optical axis of the lens is substantially horizontal with the ground surface by the level;
A first imaging step of imaging the measurement object in a state where the optical axis of the lens is substantially horizontal to the ground surface at the first imaging point;
Detecting at a second shooting point that the optical axis of the lens is substantially horizontal with the ground surface by the level;
A second imaging step of imaging the measurement object in a state where the optical axis of the lens is substantially horizontal to the ground surface at a second imaging point;
(A) Height information on the image sensor of the image of the measurement object included in the first and second imaging information obtained by imaging at the first and second imaging points, (b) the lens And the imaging element, and (c) a difference in distance from the measurement object between the first and second imaging points, the measurement object and the first imaging point. Calculating the height of the measurement object by finding a solution of simultaneous equations with unknown distance between the distance and the height of the measurement object,
Obtaining the position information of the mobile communication terminal at the first photographing point and the second photographing point by a global positioning system;
The measurement of the height of the measurement object, further comprising a step of obtaining a difference in distance from the measurement object between the first and second imaging points based on the acquired position information. Method.

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