JP2011082770A - Data generation apparatus, method of controlling the same, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique that estimates a shooting position and generation position for a captured image and generated data while the positions are not fixed. <P>SOLUTION: A data generation apparatus measures a moving state of equipment using a sensor in the apparatus, and manages the generation data and moving state by associating the data with the state while the positions are not fixed. After the positions are fixed, the apparatus estimates where data is generated by dating back to each moving state from the fixed position. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a data generation apparatus, a control method therefor, and a program.

  In recent years, with the spread of digital cameras and the like, a large amount of digitized image data has been accumulated. For this reason, there is a high demand for a technique capable of more easily searching and organizing images and displaying images that tend to be complicated for the user. In order to meet these demands, it is important to be able to handle information that links the memory and impression of the image owner with the image. This information varies depending on the shooting time, the shooting location, and the subject. Against this background, some photographic devices are equipped with a mechanism for measuring position information, and the measured position information can be automatically added to an image (see Patent Document 1).

Japanese Patent Application Laid-Open No. 07-064169

  However, it often takes time to determine the position information. For example, in a general GPS (Global Positioning System) as a position measuring means, the following procedure is generally performed from the start of measurement to the determination. First, GPS satellites that can receive signals with a GPS receiver are examined. Three or four satellites are required. Next, the distance between each satellite and the receiver is calculated from the signal received from the GPS satellite. Then, the position of each satellite is acquired from the received signal, and the position of the receiver is calculated from the distance calculated on the satellite position. As described above, since it is necessary to perform a calculation process for finding a GPS satellite and obtaining a distance and a position, a series of processes requires a minute order time. Or if it can have another communication means like a mobile telephone, information will be acquired from the base station which this communication means is communicating. Thereby, the position measurement by GPS may be accelerated, but even so, it takes about several tens of seconds.

  On the other hand, the photographing device can start photographing immediately after the power is turned on. For this reason, if it takes time to determine the position, it is often the case that shooting is performed while the position is not yet determined. In some cases, a considerable number of images may be taken while the position is uncertain. Conventionally, there has been a problem in that, with respect to an image shot while the position has not been determined in this manner, the correct shooting position cannot be known, so that shooting position information cannot be associated with the image.

  The same problem is not limited to image generation, but also occurs in a data generation apparatus that manages generated data together with information on the position where the data was generated.

  In view of the above problems, an object of the present invention is to provide a technique for estimating a shooting position and a generation position for an image and data generated while a position has not been determined.

The present invention for solving the above problems is a data generation device for generating data that can be stored in the device itself,
Calculating means for calculating position information of the data generating device;
Position determination determination means for determining whether or not position information has been determined by calculation in the calculation means;
An apparatus movement state measuring means for measuring a movement state of the data generation device based on an output from an acceleration sensor for detecting an acceleration of the data generation device;
Each data of the plurality of data generated while the position determination determination unit determines that the position information is not determined is generated from the time immediately before the data is generated until the data is generated. And the second moving state measured by the device moving state measuring unit after the latest data is generated from among the plurality of data is managed in association with the first moving state measured by the device moving state measuring unit. Equipment movement state management means for managing the movement state of
When the position determination determining unit determines that the position information has been determined, the plurality of data is generated based on the determined position information, the first movement state, and the second movement state. And a position estimating means for estimating the position.

  ADVANTAGE OF THE INVENTION According to this invention, in the data generation apparatus, the technique which estimates an imaging | photography position and a production | generation position can be provided about the image image | photographed and the produced | generated data while the position was not decided.

The figure which shows the hardware constitutions of the imaging device of embodiment of invention. The functional block diagram of the imaging device of embodiment of invention. The flowchart of the process of embodiment of invention. The figure of the management table which linked | related the picked-up image and movement state of embodiment of invention. The figure which shows the estimation result of the imaging position of the picked-up image of embodiment of invention. The figure of the management table which represented the movement state of embodiment of invention as the number of steps.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The embodiment described below shows an example when the present invention is specifically implemented, and is one of the specific embodiments having the configurations described in the claims.

[Embodiment 1]
A circuit configuration showing the data generation apparatus of the present embodiment will be described with reference to the block diagram of FIG. The data generation apparatus can be implemented as, for example, a digital camera, a digital video camera, or a mobile terminal (including a mobile phone) equipped with the camera. In addition, the present invention can be implemented as a portable personal computer equipped with or connected to a camera. In the present embodiment, a photographing device such as a digital camera or a digital video camera will be described as an example, but the description is applicable to other types of data generation apparatuses.

  In FIG. 1, a CPU 101 is a control unit that controls the entire photographing apparatus 100. The ROM 102 is a read-only storage device that stores programs and parameters that do not need to be changed. The RAM 103 is a storage device that temporarily stores programs and data supplied from an external storage device. The external storage device 104 stores captured images and the like. It includes a hard disk drive (HDD) and a flash memory drive (SSD) that are fixedly installed in the photographing apparatus 100, or a memory card and an optical disk that are removable from the photographing apparatus 100. The position information receiving unit 105 is a GPS receiver that can receive a signal from a GPS satellite, a wireless LAN receiver that can acquire position information of an access point, or the like.

  The built-in sensor 106 is a sensor that detects the gravitational direction at the time of shooting in order to determine the vertical direction of the shot image. This is provided in the photographing device for the purpose of being used in the photographing device 100. For example, an acceleration sensor or a gyroscope for image stabilization is available. In the present embodiment, a case where an acceleration sensor is provided as the built-in sensor 106 is considered. The acceleration sensor is mainly used in the photographing apparatus 100 to detect the direction of gravity. As a result, it is possible to determine whether the photographing device 100 is photographed in the vertical or horizontal direction and to determine the vertical direction of the image, so that many photographing devices are mounted. Some photographic devices are equipped with a triaxial acceleration sensor, measure a user's motion such as shaking or tilting the device, and execute a function corresponding to the motion.

  In the present embodiment, it is assumed that the photographing apparatus 100 is equipped with a triaxial acceleration sensor. The triaxial acceleration sensor is currently used in general-purpose pedometers and the like, and has a feature that it can detect the walking state regardless of the posture of the device and measure the number of steps of the user. The input unit 107 is an input unit such as a pointing device, a keyboard, and a button for performing data input and device setting in response to a user's operation and controlling operation of the device. The output unit 108 is a monitor for outputting data held by the imaging device 100, supplied data, imaging results, device parameters, and the like.

  The imaging unit 109 is configured by an imaging element such as a CCD or CMOS, a lens, an A / D converter, and the like, and performs an imaging operation to generate an image. The system bus 110 connects the units 101 to 108 so that they can communicate with each other.

  Next, the functional configuration of the photographing apparatus 100 as the data generation apparatus of the present embodiment will be described with reference to the block diagram of FIG. Each functional block shown in FIG. 2 is realized by the CPU 101 executing a program stored in the ROM or the external storage device 104.

  The position information measuring unit 201 receives information for specifying the current position of the imaging device 100 that captures an image by the position information receiving unit 105, analyzes the acquired information, and calculates the current position of the imaging device. . In the present embodiment, a case where a GPS receiver is mounted as the position information receiving unit 105 will be described. In this case, the GPS receiver receives a GPS signal as information for specifying the current position of the imaging device 100. However, the GPS receiver does not have to be mounted on the photographing apparatus 100, but may be linked to the photographing apparatus 100 by being connected externally.

  The position confirmation determination unit 202 monitors the position information measurement unit 201 and determines whether or not the current position measurement has been completed (determined state). In the present embodiment, the time until the current position is calculated by the GPS receiver is in an undetermined state, and the time when the current position can be calculated is the determined state.

  The device movement state measurement unit 203 measures and records the movement state of the photographing device from the built-in sensor 106 while the position determination determination unit 202 detects the unconfirmed state. In the present embodiment, a triaxial acceleration sensor is used as the built-in sensor 106 to determine whether or not the person carrying the imaging device 100 has moved (walked), and the presence or absence of movement is held as a movement state. . As a method for determining whether or not the user is moving, for example, a method for measuring the number of steps using an acceleration sensor, which is performed by a general pedometer or the like, may be used. That is, when an acceleration change of about 3 to 5 times the gravitational acceleration measured during normal walking is monitored, and it is detected that the acceleration change is regularly performed for a certain period of time, the movement (walking) It is assumed that And what is necessary is just to carry out the method of considering that it has stopped other than that.

  The photographing detection unit 204 detects that photographing has been performed in the photographing unit 109. When an image is generated by shooting by the shooting unit 109 and the obtained image is stored in the external storage device 104, it may be considered that shooting has been performed.

  The device movement state management unit 205 associates and manages an image captured while the position is uncertain and the movement state at the time of the photographing. When the current position is determined later, the shooting position is estimated from the movement state at the time of each shooting, so here, the management is performed so that the movement state at the time of each shooting can be traced. In the present embodiment, the movement state from the previous photographing to the current photographing is managed in association with the photographed image. It should be noted that it may be associated with either of the previous and current captured images. If determine whether to associate with either in advance, in order to traced the movement state by following in order, both as may have been managed in association with. Here, it is assumed that the image is associated with the image captured at the previous image capture. That is, information is managed by a management table as shown in FIG.

  In the management table 400 of FIG. 4, file names (001.jpg to 012.jpg) are held as information about the captured image 401 until the position is determined. As the moving state 402 of each photographed image, flag information indicating whether or not the photographed image has been moved is captured. In FIG. 4, the movement state is expressed as “presence / absence of movement” by binary values “1” and “0”, respectively. That is, for an image captured while the position is not yet determined, the movement state (first movement state) measured from when the image immediately before each image is captured until each image is captured is “1”. Or it is given as a binary value of “0”. For example, 002. jpg and 010. The first movement state of jpg is “1”. This is 001. 002. from the time of jpg shooting. Until jpg is shot, and 009. From the time of shooting jpg. It means that each movement has been performed until jpg is photographed.

  The flag 403 indicates the latest image 012. A movement state (second movement state) up to the present after jpg is photographed is shown. Next, 013. When jpg is photographed, the first movement state is 013. associated with jpg. Here, since the value is 0, 012. This indicates that no movement has been performed from the time of jpg shooting to the present time. When the current position is determined in this movement state, the second movement state indicated by the flag 403 is changed to 012. This is used to estimate the jpg shooting position. The management method is not particularly limited.

  The information corresponding to FIG. 4 may be stored and managed in the external storage device 104 or the like in association with the photographed image separately from the photographed image, or may be provided as image metadata and managed together with the image. Absent. In this embodiment, the association is performed every time shooting is performed, but this is not limited. For example, the moving state while the position is not yet determined may be held together with information on the shooting time, and may be associated later from the shooting time of an image shot during that time.

  The shooting position estimation unit 206 estimates the shooting position of each image shot at the time of uncertain based on the determined current position based on the movement state managed in association with each image. For example, if the device movement state measurement unit 203 detects whether or not the device is moving, an estimated current position is estimated as a shooting position for an image shot in a recently stopped state.

  In the example of FIG. jpg and 010. Since there was a last movement between jpgs, 010. jpg to 012. This corresponds to an image photographed with jpg being stopped recently. Therefore, for example, if the determined current position is (N35.56564, E139.68129), as shown in FIG. jpg to 012. It is estimated that the shooting position of jpg is the same as the determined position. On the other hand, since images taken before that have undergone some movement, 001. jpg to 009. It is estimated that the shooting position of jpg is unknown. In the estimated shooting position management table 500 of FIG. 5, a shot image 501 and a shooting position estimation result 502 of each captured image are registered.

  1 and 2 show a configuration in which each component is mounted on the photographing apparatus 100 as a data generation device. However, the embodiment of the present invention is not limited to this configuration, and each function may be distributed and implemented in a plurality of apparatuses according to the implementation form of the data generation apparatus. For example, the processing performed by the shooting position estimation unit 206 need not be performed by the shooting device 100, and may be performed using a CPU or RAM of another device (such as a PC).

  Next, a procedure of processing for estimating the shooting position of an image shot while the current position has not been determined in the shooting device 100 as the data generation apparatus of the present embodiment will be described with reference to the flowchart of FIG. .

  In step S <b> 301, the position information measurement unit 201 starts measuring the current position of the imaging device 100. Here, a case is considered where measurement of the shooting position is started when the power of the imaging device 100 is turned on for shooting. However, the present invention is not limited to this example. For example, the position information may be measured again when the GPS satellite can be temporarily captured after the GPS satellite can be captured again.

  In S302, the position determination determination unit 202 monitors the position information determination state and continuously determines whether or not the position information has been determined. At the same time, the photographing detection unit 204 monitors the photographing action at the photographing unit 109 and continuously determines whether or not there has been a photographing action. If it is determined in S302 that the position is in the confirmed state from the monitoring result of the confirmed state of the position information ("YES" in S303), the process proceeds to S307. On the other hand, if it is in the indefinite state (“NO” in S303), the process proceeds to S304.

  In S304, the device movement state measurement unit 203 measures and holds the movement state of the imaging device 100. Note that the built-in sensor 106 is operated only when the position is in an undetermined state in the moving state measurement application. As a result, the power consumption of the device is minimized.

  In step S <b> 305, the photographing detection unit 204 detects whether or not photographing has been performed while the position is not yet determined. When shooting is performed (“YES” in S305), S306 is performed. On the other hand, if shooting has not been performed, the determination in S302 is continuously performed.

  In step S <b> 306, the device movement state management unit 205 manages the movement state from the previous shooting time to the current shooting time measured by the device movement state measurement unit 203 in association with the shot image. In the present embodiment, management is performed so that an image taken while the user has not moved recently can be seen.

  In S307, the use of the built-in sensor 106, which has been operated for the purpose of measuring the movement state, for the same purpose in the main flow is stopped in response to detection of the determined state of the position.

  In S <b> 308, the shooting position estimation unit 206 estimates the shooting position of each shot image shot while the position has not been determined, and generates the estimated shooting position management table 500. In the present embodiment, since an image captured in a period in which no movement including the time of position determination is not detected in the management table 400 is known, the position at the time of determination is estimated as the image capturing position of the image. For the other images, the shooting position is unknown.

  As described above, in this embodiment, while the position is not yet determined, the movement state of the device is measured using the sensor, and the image captured during that time is associated with the movement state and managed. Thereafter, after the position is determined, the shooting position of each image is estimated from the determined position and the moving state. As a result, there is a high possibility that the correct shooting position can be automatically given even for an image shot while the position where it was difficult to give the shooting position in the past has been determined.

[Embodiment 2]
In the first embodiment, the case where the presence / absence of movement is detected by the built-in sensor 106 and the binary representation of 0/1 is described. However, the embodiment of the invention is not limited to the binary representation of the presence / absence of movement. For example, as described in the previous embodiment, when the walking state can be detected, the approximate number of steps of the user may be counted and the presence or absence of movement may be represented by the number of steps. That is, the number of steps is “0” when there is no movement, and the number of steps is “an integer greater than or equal to 1” when there is movement. In this case, the number of steps is associated with the captured image.

  For example, 009. From the time of shooting jpg. If 88 steps of walking are detected before jpg is photographed, as shown in FIG. Jpg is associated with the number of steps. After that, when the position is determined, the approximate distance from the determined position to the shooting position of each image is estimated from the information on the number of steps associated with each other while tracing the captured image in the reverse order of the shooting order. In FIG. 6, 009. Since there were 88 steps + 0 steps + 6 steps + 5 steps = 99 steps from jpg to the determination of the current position, 009. jpg is estimated to be taken at a position at a distance of about 99 steps from the current position. The output of the estimation result is not particularly limited. It may be output in the form of how many steps are away from the current position information, or the number of steps may be output by replacing the step length of an average figure person (for example, 65 cm) with the distance. Alternatively, if profile information such as the height of the user is obtained, the step length estimated from the height (height-100 cm, etc.) may be replaced with a distance. When the distance is replaced, it can be expressed as a radius N meter or the like with the determined position as the center.

  Based on the obtained result, the shooting position estimation unit 206 registers the step length or the distance calculated from the step length for an image that is unknown in the estimated shooting position management table 500.

  According to the second embodiment described above, an effect can be obtained in which an approximate position can be indicated with respect to the shooting position that has been unknown in the previous embodiment.

[Embodiment 3]
In the above-described embodiment, an example has been described in which an acceleration sensor is mounted as the built-in sensor 106, thereby detecting the presence or absence of movement or the number of steps. However, the built-in sensor 106 can include a geomagnetic sensor (orientation sensor) that detects the direction in which the photographing apparatus 100 faces in addition to the acceleration sensor. In this case, the direction in which the imaging device 100 detected by the azimuth sensor faces is regarded as the movement direction, and when the movement amount is known as in the previous embodiment, the direction and the movement amount are associated together. For example, in the example of FIG. 6, the breakdown of the 88 steps may be recorded as how many steps each move in which direction, such as (N22 + E14 + S25 + W27).

  In this way, each shooting position including the direction may be estimated after the position is determined. The built-in sensor 106 is not limited to the above sensor. When a sensor other than the above is mounted and the sensor can measure the presence / absence, movement amount, movement direction, and the like of the device, the sensor may be used.

  According to the third embodiment described above, it is possible to obtain an effect that the photographing position can be estimated in more detail than the estimation in the previous embodiment.

[Embodiment 4]
In the above-described embodiment, the case where the position information receiving unit 105 is a GPS receiver has been described. However, the embodiment of the invention is not limited to this. It may be another position measuring device that takes time to reach a definite state. For example, a receiver (wireless LAN card or the like) for wireless LAN communication corresponding to the communication standard of IEEE802.11x (x is a, b, g, n, etc.) other than the GPS receiver may be used. In this case, the location information can be calculated based on the location information of the access point included in the radio signal received from the access point (base station) of the wireless LAN and the distance obtained from the radio wave intensity of the received radio signal. . Specifically, the position of the device is obtained after searching for connectable access points, obtaining the location information of the access points, and calculating the distance between the devices and the access points from the radio wave intensity. . At that time, the position of the access point having the strongest radio wave intensity may be used, or the position may be determined based on the radio wave intensity from three or more access points as in the case of GPS. A known technique can be used for the position determination method based on the information provided from the access point and the radio wave intensity. Therefore, detailed description of the details is omitted here.

  Even in this embodiment, since it is conceivable that shooting is performed during the process in which the position information measuring unit 201 calculates the current position of the photographing device 100, the present invention is also applicable to the case where the position information receiving unit 105 is a wireless LAN card or the like. Is applicable. In addition, there is a photographing apparatus that can improve the accuracy of position measurement by GPS and shorten the time by using a GPS receiver in combination with another communication device. However, even in such a device, it is necessary to perform some processing for position measurement, and there is a period in which the current position is uncertain. Also in these devices, the present invention can be applied to position estimation of an image taken before the position is determined.

[Embodiment 5]
In the above-described embodiment, the case where there is one position information measuring unit 201 has been described. However, a plurality of position information measuring units 201 may be provided depending on the type of the position information receiving unit 105. For example, a position information measurement unit 201-1 for a GPS receiver and a position information measurement unit 201-2 for a wireless LAN receiver may exist. In this case, the position information measuring units 201-1 and 201-2 also output the certainty factor together with each measurement result when the position is determined. The shooting position is estimated from the position information of the current position obtained from the position information measuring unit with the higher certainty factor.

  More specifically, for example, based on the intensity of a signal received by a GPS receiver, when the reception intensity is equal to or greater than a predetermined threshold, a certainty factor for the measurement result in the position information measurement unit 201-1 is set in advance. It may be a value. The threshold value can be set as a value at which the position can be effectively identified by the received signal in the GPS receiver. Further, when the certainty value is expressed in the range of 0 to 100, the constant value can be a considerably high value such as 80. On the other hand, when the intensity of the received signal is less than the threshold, for example, when the reception intensity cannot be achieved due to bad weather or indoor environment, the certainty factor may be set to a low value such as 20.

  In this way, when the received signal strength at the GPS receiver is high, a certainty factor is given for preferential use of the GPS signal, and the wireless LAN receiver is used in an environment where the accuracy cannot be achieved with the GPS receiver. Give confidence to Note that a certainty factor proportional to the measured reception intensity may be given without using the threshold value. On the other hand, when the current position is obtained based on the wireless LAN receiver, a certainty factor according to the measured reception intensity is calculated between 0 and 100, for example. As this calculation method, a value proportional to the reception intensity may be assigned, or any other method may be employed. The calculated certainty factor is compared with the certainty factor obtained with respect to the current position based on the GPS receiver, and a current position having a higher certainty factor is adopted.

  In addition, when the current position is determined at different timings in a plurality of position information measurement units, when the certainty of the current position that can be determined later in time is higher than that determined earlier, the position that can be determined later The shooting position may be re-estimated as a starting point.

  According to the above, it is possible to specify the current position of the imaging device 100 using more accurate information among the position information from the plurality of position information measurement units, and estimate the imaging position.

[Embodiment 6]
In the above-described embodiment, the case where a three-axis acceleration sensor is mounted as the built-in sensor 106 has been described. However, the present invention is not limited to this. In the case of an acceleration sensor, one or two axes may be mounted for the purpose of detecting the vertical / horizontal state of the photographing device. Any sensor may be used as long as the movement state is acquired according to the function of each sensor. For example, in the case of one axis, it is determined whether the photographing device is in a posture capable of detecting acceleration in the direction of gravity. While there is a regular change in acceleration in the gravitational direction during detection in this posture, it is determined whether or not the vehicle is moving. In other cases, the photographing device may be carried in a posture in which it is difficult to detect a change in acceleration during movement.

[Embodiment 7]
In the above, the embodiment of the present invention has been described with respect to a data generation apparatus having a camera function. However, for example, in another device having a function of data generation (including data generation by measurement), the present invention can be applied when it is necessary to manage the generated data and the information on the measurement position in association with each other. . In this case, in the above-described embodiment, the word “image” may be replaced with “data” and the word “photographing” may be replaced with “generation”. Examples of data that can be generated here include data that can be stored in the device itself, such as voice data, document data, environmental data indicating temperature, humidity, and other environmental conditions, and measurement data measured according to a predetermined measuring instrument. It is done. However, the device needs to have a device for measuring the position such as a GPS receiver and a built-in sensor capable of detecting the movement of the device mounted or connected.

[Other Embodiments]
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media. Then, the computer (or CPU, MPU, etc.) of the system or apparatus reads out and executes the program.

Claims (10)

A data generation device that generates data that can be stored in its own device,
Calculating means for calculating position information of the data generating device;
Position determination determination means for determining whether or not position information has been determined by calculation in the calculation means;
An apparatus movement state measuring means for measuring a movement state of the data generation device based on an output from an acceleration sensor for detecting an acceleration of the data generation device;
Each data of the plurality of data generated while the position determination determination unit determines that the position information is not determined is generated from the time immediately before the data is generated until the data is generated. And the second moving state measured by the device moving state measuring unit after the latest data is generated from among the plurality of data is managed in association with the first moving state measured by the device moving state measuring unit. Equipment movement state management means for managing the movement state of
When the position determination determining unit determines that the position information has been determined, the plurality of data is generated based on the determined position information, the first movement state, and the second movement state. A data generation apparatus comprising: position estimation means for estimating a position. The device movement state measuring means measures the movement state as the presence or absence of movement of the data generation device,
The position estimation means, when the second movement state indicates that the data generation device has not moved,
The most recently generated data of the plurality of data; and
The position where the data up to the newest data generated before the most recently generated data and the first moving state indicating that the data generating device has moved is generated is determined. The data generation apparatus according to claim 1, wherein the position information is estimated to be the same as the position information. The device movement state measuring means measures the presence or absence of the movement as the number of steps of the user of the data generation device,
The first movement state indicates, for each data of the plurality of data, the number of steps of the user between generation of the data immediately before the data and generation of the data.
The position estimation unit is configured to determine, from the plurality of data, a position where other data is generated except for data in which the generated position is estimated to be the same as the determined position information. The data generation apparatus according to claim 2, wherein the estimation is based on information on the number of steps included in the movement state. Further comprising an azimuth sensor for detecting an azimuth facing the data generation device;
The device movement state measuring means measures the presence / absence of the movement as the number of steps of the user for each direction detected by the direction sensor,
The first movement state indicates, for each data of the plurality of data, the number of steps for each direction of the user from the time immediately before the data is generated until the data is generated,
The position estimation unit is configured to determine, from the plurality of data, a position where other data is generated except for data in which the generated position is estimated to be the same as the determined position information. The data generation apparatus according to claim 2, wherein the estimation is based on information on the number of steps for each direction included in the movement state. The data generation device includes a GPS receiver,
5. The data generation apparatus according to claim 1, wherein the calculation unit calculates the position information based on a GPS signal received by the GPS receiver. 6. The data generation device includes a wireless LAN receiver,
5. The data generation apparatus according to claim 1, wherein the calculation unit calculates the position information based on a wireless signal received by the wireless LAN receiver. The data generation device includes a GPS receiver and a wireless LAN receiver,
The calculating means includes
Calculating the position information based on the GPS signal received by the GPS receiver;
Based on the received intensity of the GPS signal, calculate the certainty of the position information calculated based on the GPS signal,
Calculating the position information based on a wireless signal received by the wireless LAN receiver;
Based on the reception strength of the radio signal, calculate the certainty of the position information calculated based on the radio signal,
Comparing the certainty calculated based on each of the GPS signal and the radio signal, the position information having a higher certainty is used as position information indicating the current position of the data generating device. The data generation device according to any one of claims 1 to 4. It further comprises a photographing means for photographing an image,
The data generation apparatus according to claim 1, wherein the data is an image generated by a photographing unit. A method of controlling a data generation device that generates data that can be stored in the device,
A calculating step for calculating position information of the data generating device;
A position confirmation determining step for determining whether or not the position information is confirmed by calculation in the calculation step;
A device movement state measurement unit that measures a movement state of the data generation device based on an output from an acceleration sensor that detects an acceleration of the data generation device; and
The device movement state management means uses each data of the plurality of data generated while the position information is determined to be indeterminate in the position determination determination step after the data immediately before the data is generated. Management is performed in association with the first movement state measured in the device movement state measurement step until each data is generated, and the device movement is performed after the latest data is generated among the plurality of data. A device movement state management step for managing the second movement state measured in the state measurement step;
When the position estimation means determines that the position information has been determined in the position determination determination step, the plurality of positions are determined based on the determined position information and the first movement state and the second movement state. And a position estimation step of estimating a position where the data is generated.   A program that causes a computer to function as each unit of the data generation device according to any one of claims 1 to 8.

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