JP2014171057A - Portable device, control method therefor, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable device with a camera capable of changing to a photographing condition corresponding to a surrounding environment without a user operation.SOLUTION: A portable device 1 comprises: photographing means 5; atmospheric pressure detection means 2 that detects atmospheric pressure; atmospheric pressure variation rate calculation means 3 that calculates an atmospheric pressure variation rate on the basis of the detected atmospheric pressure; and control means 4 that changes a photographing condition of the photographing means on the basis of the atmospheric pressure variation rate. When the atmospheric pressure variation rate is equal to or higher than a predetermined value, it is determined that the portable device is in water, and the photographing condition of the photographing means is changed to an in-water photographing condition.

Description

  The present invention relates to a portable device provided with photographing means and a control method thereof. In particular, the present invention relates to a photographing unit that sets a photographing mode according to the surrounding environment.

  Cameras with a waterproof mechanism that enables underwater photography and portable terminals with cameras are used. Among such cameras and camera-equipped mobile terminals, there are models that allow a user to take a more preferable underwater photograph by switching to the underwater photography mode. Here, the underwater shooting mode is suitable for underwater shooting by setting the sensitivity and white balance settings to be compatible with the underwater environment in water where the shooting environment is dark and the color balance of ambient light is significantly different from daylight. This is a shooting mode that allows you to take pictures.

  However, in a camera-equipped mobile terminal equipped with a waterproof mechanism, there is a problem that when an operation for switching to an underwater shooting mode is attempted after entering the water, it is not easy to change the shooting mode due to the influence of water pressure or the like.

  In order to solve the above problem, for example, in Patent Document 1, whether or not the camera is in water is detected by the water pressure detected by the water pressure sensor, and if it is determined that the camera is in water, the focus area is automatically set. There is disclosed a digital camera configured to display an enlarged image.

JP 2005-328225 A

  The following analysis is given by the present invention.

  However, when a pressure sensor is mounted on a camera-equipped portable terminal, and the pressure sensor tries to determine whether the portable terminal is in water, the method described in Patent Document 1 The underwater determination is performed by the above, and there is a risk of erroneous determination due to the following causes. First, the barometer is affected by wind in the atmosphere, and the detected atmospheric pressure includes an error. In shallow water, the atmospheric pressure does not increase as much as the atmospheric pressure. Due to these factors, it is difficult to detect from the barometer value that the camera-equipped mobile terminal has entered shallow water from the atmosphere, and an erroneous determination may occur.

  Some users who want to take underwater photos with a mobile terminal with a camera may want to take photos in relatively shallow water. Thus, it is desired to accurately detect that the mobile terminal is underwater even in shallow water and to enter the underwater shooting mode without user operation.

  An object of the present invention is to provide a camera-equipped mobile device that can contribute to changing to a shooting condition according to the surrounding environment without a user operation.

  The portable device according to the first aspect of the present invention is based on the photographing means, the atmospheric pressure detecting means for detecting atmospheric pressure, the atmospheric pressure change rate calculating means for calculating the atmospheric pressure change rate based on the atmospheric pressure, and the atmospheric pressure change rate. Control means for changing the photographing condition of the photographing means.

  A portable device control method according to a second aspect of the present invention is a portable device control method including a photographing unit, and includes the following steps. That is, the method for controlling the portable device includes a step of measuring the atmospheric pressure. The method for controlling the portable device includes a step of calculating an atmospheric pressure change rate based on the atmospheric pressure. Furthermore, the method for controlling the portable device includes a photographing condition changing step of changing a photographing condition of the photographing unit based on the atmospheric pressure change rate.

  A program according to a third aspect of the present invention is a program for controlling a portable device including a photographing unit, and a process for calculating a pressure change rate based on a measured pressure, and the photographing unit based on a pressure change rate. The computer is caused to execute processing for changing the shooting conditions.

  According to the portable device of the present invention, it is possible to provide a camera-equipped portable device that can contribute to changing to a shooting condition according to the surrounding environment without a user operation.

It is a block diagram which shows the structure of the portable apparatus which concerns on one Embodiment. It is a flowchart which shows operation | movement of the portable apparatus which concerns on one Embodiment. It is a block diagram which shows the structure of the portable apparatus which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of the portable apparatus which concerns on 1st Embodiment. It is a figure for demonstrating the underwater determination in 1st Embodiment. It is a block diagram which shows the structure of the portable apparatus which concerns on 2nd Embodiment. It is a flowchart which shows operation | movement of the portable apparatus which concerns on 2nd Embodiment.

  First, the outline | summary of embodiment of this invention is demonstrated. Note that the reference numerals of the drawings added in the description of the outline of the embodiment are merely examples for helping understanding, and are not intended to be limited to the illustrated modes.

  As shown in FIG. 1, a portable device 1 according to an embodiment of the present invention includes an imaging unit 5, an atmospheric pressure detection unit 2 that detects atmospheric pressures C1 and C1 ′, and an atmospheric pressure change rate C2 based on the atmospheric pressures C1 and C1 ′. The atmospheric pressure change rate calculating means 2 for calculating the pressure and the control means 4 for changing the photographing condition C3 of the photographing means 5 based on the atmospheric pressure change rate C2.

  According to the above configuration, since it is determined whether or not the portable device is underwater using the atmospheric pressure change rate C2, the accuracy of the determination can be achieved even in shallow water that is difficult to distinguish from the atmosphere. Can be improved. Thereby, even in shallow water, when taking an underwater photograph, it is possible to change to a photographing condition corresponding to the surrounding environment (for example, underwater) without a user operation.

  In the portable device, the control means (4 in FIG. 1) determines that the portable device is underwater when the atmospheric pressure change rate C2 is equal to or higher than a predetermined value (th1 in FIG. 4), and the photographing means (in FIG. 1). The shooting conditions of 5) may be changed to underwater shooting conditions.

  In the portable device, when the atmospheric pressure detected by the atmospheric pressure detecting means (2 in FIG. 1) approaches the atmospheric pressure within a predetermined range (for example, as shown in S23 of FIG. 4, the atmospheric pressure detected by the atmospheric pressure detecting means) When the difference between the Z and the atmospheric pressure X0 is equal to or less than the predetermined value th2, the control means (4 in FIG. 1) determines that the portable device has moved from the water to the atmosphere, and the underwater shooting conditions You may make it cancel application.

  As shown in FIG. 6, the portable device further includes a water detection sensor 115, and the control means (4 in FIG. 1) has a pressure change rate C2 equal to or higher than a predetermined value (th1 in FIG. 4) and detects water. When the sensor 115 detects moisture, it may be determined that the subject is underwater, and the photographing condition of the photographing unit (5 in FIG. 1) may be changed to the underwater photographing condition.

  In the portable device, the control means (4 in FIG. 1) may count the underwater use time and notify the user of the underwater use time.

  In the portable device, when the underwater usage time and the atmospheric pressure exceed the waterproof conditions of the portable device, an alarm may be notified to the user.

  In the portable device, at least one of the underwater use time, the start time of the underwater use time, the end time of the underwater use time, and the atmospheric pressure determined to be underwater is recorded in the storage unit (110 in FIGS. 3 and 6). You may do it.

  A method for controlling a portable device according to an embodiment of the present invention is a method for controlling a portable device including an imaging unit 5 as shown in either FIG. 1 or 2, and includes the following steps. That is, the method for controlling the portable terminal device includes steps (S1, S3) of measuring the atmospheric pressure C1, C1 '. In addition, the method for controlling the portable device includes a step (S4) of calculating an atmospheric pressure change rate C2 based on the atmospheric pressures C1 and C1 '. Further, the method for controlling the portable device includes an imaging condition changing step (S5) for changing the imaging condition C3 of the imaging means 5 based on the atmospheric pressure change rate C2.

  In the portable device control method, the photographing condition changing step determines that the portable device is underwater when the atmospheric pressure change rate C2 is equal to or greater than a predetermined value th1, as shown in FIG. 4 (S16). The photographing condition of the photographing means (such as 5 in FIG. 1) may be changed to the underwater photographing condition (S20).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
(Configuration of the first embodiment)
The configuration of the first embodiment will be described in detail with reference to FIG. FIG. 3 is a block diagram showing the configuration of the mobile terminal (mobile device) 100 according to the first embodiment. As illustrated in FIG. 3, the mobile terminal 100 includes an antenna (ANT1) 101 for communicating with a base station, a wireless transmission / reception unit 102, a CPU (Central Processing Unit), a control unit 103 that controls the entire mobile terminal 100, a side Operation unit 104 including keys, etc., microphone 105 for voice call, receiver 106 for voice call, speaker 107, camera unit 108 provided on the back of the casing, barometer 109, storage unit 110, acceleration sensor 111, GPS The receiver 113 is configured to include a GPS antenna (GPS-ANT) 114.

  The barometric pressure detection means 2, the control means 4, and the imaging means 5 that are the components of FIG. 1 referred to in the outline description of the embodiment correspond to the barometer 109, the control unit 103, and the camera unit 108 of FIG. 1 is executed by a program processed by the control unit 103, and corresponds to S15 in FIG. 4 (details will be described later).

  The barometer 109 has a function of detecting ambient atmospheric pressure, and outputs the detected atmospheric pressure value to the control unit 103 in response to a request from the control unit 103. In addition, the barometer 109 detects a value obtained by adding the water pressure to the atmospheric pressure in water, and outputs the detected value to the control unit 103 in response to a request from the control unit 103. In the present specification, the atmospheric pressure added by the water pressure detected by the barometer 109 in water is also simply referred to as “atmospheric pressure”.

  The storage unit 110 includes a RAM (Random Access Memory) and a ROM (Read Only Memory), and includes a work area, a program area, and a data area. In the work area, data temporarily used in the processing of the control unit 103 is stored. Various programs executed by the control unit 103 are stored in the program area. In the data area, operation screen data by the operation unit 104, various data acquired from the base station, and the like are stored.

  The portable terminal 100 has a waterproof mechanism, and the protection class of JIS standard is IPX7. JIS standard IPX defines protection classes 0-8. For example, IPX7 is waterproof to the extent that it will not be submerged in water even if it is temporarily submerged in a constant water pressure condition (anti-immersion type). It is a mechanism. Therefore, the mobile terminal 100 can take an underwater photograph by the camera unit 108 of the mobile terminal 100 within the conditions defined by IPX7. The captured image is recorded in a storage unit 110 or a recording medium (not shown) in a predetermined compression format.

  The portable terminal 100 is configured such that various shooting conditions of the camera unit 108 can be set by a user operating a key of the operation unit 104. The shooting conditions are also configured to be switched in units of shooting modes, and the shooting modes include a normal mode, an underwater shooting mode, a night view mode, and the like.

  However, regarding the switching of the underwater shooting mode, since it is difficult to perform the operation underwater as described above, the portable terminal 100 realizes switching to the underwater shooting mode without any user operation (details will be described later). .

(Operation of the first embodiment)
Next, the operation of the first embodiment will be described in detail with reference to FIG. FIG. 4 is a flowchart showing the operation of the mobile terminal 100 according to the first embodiment. Here, before describing the details of the operation of FIG. 4, the problem of the first embodiment will be described with reference to FIG. 5. FIG. 5 is a diagram for explaining the problem of underwater determination according to the first embodiment. As shown in FIG. 5, the user holds the portable terminal 100 in a state where the portable terminal 100 is activated, and enters the shallow water (c) from the atmosphere (a), directly below the water surface (b), ( It is assumed that an underwater photograph is taken at the position c).

  At the position of deep water (d) in FIG. 5, the value of the atmospheric pressure detected by the barometer 109 is sufficiently larger than the value of atmospheric pressure in the atmosphere (a). Therefore, as disclosed in Patent Document 1 By determining that the value of the barometer 109 exceeds the predetermined value as underwater, the underwater determination can be performed with high accuracy.

  However, in the case of shallow water (c), there is a risk of misjudgment only by comparing the pressure value at the position (c) with the pressure value in the atmosphere (a) for the following reasons. First, in the atmosphere (a), when the barometer 109 is affected by wind, there is a problem that an error occurs in the detected atmospheric pressure value. Further, in shallow water (c), the atmospheric pressure does not increase as much as in the atmosphere (a). For these reasons, it is difficult to detect from the magnitude of the atmospheric pressure that the portable terminal 100 has entered shallow water (c) from the atmosphere (a).

  Therefore, in the first embodiment, it is possible to accurately detect that the mobile terminal 100 has entered the shallow water (c) from the atmosphere (a) by using the pressure change rate instead of the pressure value. ing. When the mobile terminal 100 moves from (a) to (c), the atmospheric pressure change rate increases between (b) and (c) when it enters the water. Further, since the path from (b) to (c) is not affected by the wind, the atmospheric pressure change rate can be detected stably.

  Hereinafter, a specific operation will be described with reference to FIG. In FIG. 4, when the user activates the camera unit 108 (S10), the barometer 109 is activated in conjunction therewith (S11). However, in the case of a user who does not perform underwater photography, it is possible to prevent the barometer 109 from consuming power by setting the barometer 109 not to start.

  Next, immediately after the barometer 109 is activated, the control unit 103 reads the barometric pressure X0 output from the barometer 109 in the atmosphere. Thereafter, the control unit 103 reads the atmospheric pressure output from the barometer 109 every predetermined time T0.

Next, a timer process for waiting for the elapse of the predetermined time T0 is performed (S13), and the control unit 103 reads the barometric pressure Y output from the barometer 109 at the timing of Yes in S13 (S14). Then, the atmospheric pressure change rate C2 is calculated from the equation (1) (S15).

Air pressure change rate C2 = (Y−X) / T0 Formula (1)

However, when the calculation of step S15 is performed for the first time, X in Expression (1) is X0. The formula for calculating the atmospheric pressure change rate C2 is not limited to the equation (1), and any equation can be applied as long as it represents the detected atmospheric pressure change rate. For example, in the expression (1), the change rate is calculated from two atmospheric pressure values, but an operation referring to three or more atmospheric pressure values may be performed.

  Next, the control unit 103 determines whether or not the calculated atmospheric pressure change rate C2 is equal to or greater than a predetermined threshold th1 (S16). If C2 <th1 in step S16, it is determined that it is not underwater (in the atmosphere), the process proceeds to step S17, the shooting mode is set to the normal mode, and the process returns to step S13 to repeat the process. Here, in order to calculate the atmospheric pressure change rate C2 in the next step S15, the atmospheric pressure Y obtained in step S14 is replaced with X before returning to step S13.

  On the other hand, if C2 ≧ th1 in step S16, it is determined that the mobile terminal 100 is in water and the process proceeds to step S19. Here, the threshold value th1 used in step S16 is set to a value slightly smaller than the assumed atmospheric pressure change rate when performing an operation of diving in the shallow water (c) immediately below the water surface (b) in FIG. It is desirable to set it. Further, it is desirable that the value of the threshold th1 is set to a value larger than the atmospheric pressure change rate that changes due to the influence of wind or the like in the atmosphere. By setting the value of the threshold th1 in advance so as to satisfy the above two conditions, it is possible to accurately determine that the user holding the mobile terminal 100 is underwater when diving in shallow water (c). Can do.

  Returning to FIG. 4 and continuing the description, in step S19 (when it is determined to be underwater), the control unit 103 stores the value of the atmospheric pressure Y and the underwater start time Ts in the storage unit 110. Here, the underwater start time Ts is the time at the time of entering step S19. Then, the shooting mode of the camera unit 108 of the mobile terminal 100 is set to the underwater shooting mode (S20). At this time, the user may be informed that the underwater shooting mode has been set through the screen of the display unit 112 or an LED lamp (not shown).

  Steps S21 to S26 in FIG. 4 and subsequent steps are processing of a portion where the control unit 103 detects that the mobile terminal 100 returns from the water to the atmosphere. Here, a method is used in which it is determined whether the measured atmospheric pressure Z, not the atmospheric pressure change rate C2, has approached the atmospheric pressure X0 measured in the atmosphere.

  First, in step S21, a timer process is performed to wait for elapse of a predetermined time T0 from the previous reading of the barometer 109 (S21), and the control unit 103 reads the barometric pressure Z output from the barometer 109 at the timing of Yes in S21 ( S22). Subsequently, the control unit 103 determines whether or not the atmospheric pressure Z has approached the atmospheric pressure X0 (obtained in S12) measured in the atmosphere. Specifically, the control unit 103 determines whether or not the difference between the atmospheric pressure Z and the atmospheric pressure X0 is equal to or less than the threshold th2 (S23). When Z−X0> th2 in step S23, the control unit 103 determines that the mobile terminal 100 is still underwater, counts up a counter that measures the elapsed time in water, and stores the count value in the storage unit 110. Store. And it returns to step S21 and repeats a process.

  On the other hand, if Z−X0 ≦ th2 in step S23, the control unit 103 determines that the atmospheric pressure Z is sufficiently close to the atmospheric pressure X0 and the mobile terminal 100 has entered the atmosphere, and sets the underwater end time Te and the elapsed time T. Store in the storage unit 110. Here, the elapsed time T is obtained by multiplying the counter value counted up in step S24 by T0. The underwater end time Te is the time at the time of entering step S25, and is obtained by adding the elapsed time T to the underwater start time Ts.

  Then, the control unit 103 cancels the underwater shooting mode and sets the shooting mode to the normal mode (S26), returns to step S13, and repeats the processes of S13 to S26 described above.

  Although not shown in the flowchart of FIG. 4, the control unit 103 performs the following processing in parallel. First, at the timing when the underwater shooting mode is set in step S20, the display unit 112 of the portable terminal 100 displays that the underwater shooting mode has been changed and notifies the user. Further, the elapsed time T counted up in step S24 is displayed on the display unit 112 of the mobile terminal 100, and the user is notified of the underwater usage time.

  The test conditions of the standard IPX7 of the portable terminal 100 are generally defined as 30 minutes at a water depth of 1 m, but each water depth (where the water depth is Is stored in the storage unit 110 of the portable terminal 100 as table data. After the underwater start time Ts (step S19), it is determined at any time whether or not the waterproof condition of the portable terminal 100 has been exceeded by comparing the pressure value Z and the elapsed time with the conditions read from the table data.

  Then, when the allowable condition is exceeded, the user is notified of this by an alarm sound, LED flashing, or the like, and the user is encouraged to enter the atmosphere.

  Further, in the case of a portable terminal of a standard other than IPX7, it is the same as in the case of IPX7 described above by storing in the table data including the water depth and time specified by the test conditions of the standard and other conditions. May be performed.

  Further, the atmospheric pressure Y (atmospheric pressure determined to be underwater) stored in the storage unit 110 in step S19, the underwater start time Ts, the underwater end time Te stored in the storage unit 110 in step S25, and the elapsed time T are accumulated as a log. Therefore, it can be used as effective information in failure analysis.

  As described above, according to the mobile terminal 100 according to the first embodiment, the following effects can be obtained.

  First, the atmospheric pressure change rate C2 is calculated based on the atmospheric pressure detected by the barometer 109, and it is determined whether or not the mobile terminal 100 is underwater using the atmospheric pressure change rate C2. Even in shallow water where it is difficult to discriminate, it is possible to improve the accuracy of the determination. Thus, even in shallow water, when taking an underwater photograph, it is possible to change to an underwater photography mode suitable for underwater without user operation, and an underwater photograph with favorable white balance, brightness, and the like can be taken. In the case of deep water, the value of the atmospheric pressure is considerably larger than that in the atmosphere. Therefore, as described in Patent Document 1, the determination of underwater may be performed based on the value of atmospheric pressure. is there.

  Secondly, by counting the elapsed time T from the time when it is determined to be underwater based on the atmospheric pressure change rate C2, the user is notified of the underwater usage time and the waterproof condition of the mobile terminal 100 (eg, IPX standard) If it exceeds, it can be notified to the user.

(Second Embodiment)
The second embodiment will be described in detail with reference to FIGS. FIG. 6 is a block diagram illustrating a configuration of the mobile terminal 200 according to the second embodiment. As can be seen by comparing FIG. 6 with FIG. 3 (first embodiment), a water detection sensor 115 is newly added to the portable terminal 200 of the second embodiment.

  The water detection sensor 115 is a sensor that detects moisture, and outputs a signal that detects moisture to the control unit 103. In the second embodiment, the accuracy of underwater determination is improved by using a water detection sensor 115 in addition to the barometer 109.

  FIG. 7 is a flowchart showing the operation of the mobile terminal 200 according to the second embodiment. As can be seen by comparing FIG. 7 with FIG. 4 (first embodiment), step S18 is newly added in FIG. 7, and the following description will focus on S18. The other steps in FIG. 7 are the same as those in FIG.

  In FIG. 7, only when the atmospheric pressure change rate C2 is greater than or equal to the threshold th1 in step S16 and the water detection sensor 115 detects moisture in step S18 (Yes in S18), the control unit 103 is connected to the mobile terminal 200. Judged to be underwater. Thereby, the precision of underwater determination is improved. For example, when the mobile terminal 200 is in the atmosphere (a) in FIG. 5, even if the atmospheric pressure change rate C2 exceeds the threshold th1 due to the influence of wind or the like and is erroneously determined to be underwater in step S16, the water detection sensor 115 Thus, it is possible to prevent the erroneous determination described above by determining that it is not underwater in step S18.

  Further, if it is assumed that the water detection sensor 115 is used in combination, the threshold th1 can be adjusted so that the underwater determination is performed in shallower water. As a result, it is possible to perform underwater determination in shallower water than in the first embodiment.

  As described above, according to the mobile terminal 200 according to the second embodiment, in addition to the effects obtained in the first embodiment, the accuracy of underwater determination is improved by using the water detection sensor 115 together. In addition, underwater judgment can be made even in shallower water.

  In each embodiment, the case of underwater photography has been described. However, the technology of the present invention can be applied to various other purposes. For example, when moving between floors using an elevator in a building, the movement of the floor is detected based on the rate of change in atmospheric pressure, and the shooting conditions of the camera mounted on the portable device are suitable for the destination floor. It is possible to automatically set the conditions.

  In addition, each process (S12-S17, S19-S26 of FIG. 4; S12-S26 of FIG. 7) which the control part 103 in each embodiment performs is stored as a program in the memory | storage part 110, and the control part 103 is provided. Called and executed by another computer. The program can be downloaded via a network or updated using a storage medium storing the program.

  INDUSTRIAL APPLICABILITY The present invention can be applied to automatically setting various shooting conditions in a mobile phone and a smartphone having a waterproof function. Furthermore, the present invention can be used for various types of photographing in general portable devices having photographing means, such as game machines, tablet PCs (Personal Computers), notebook PCs, PDAs (Personal Data Assistants), digital cameras, and the like. It can be applied to automatically set conditions.

  Note that, within the scope of the entire disclosure (including claims and drawings) of the present invention, the embodiments can be changed and adjusted based on the basic technical concept. Various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible within the scope of the claims of the present invention. . That is, the present invention naturally includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the drawings, and the technical idea. In particular, with respect to the numerical ranges described in this document, any numerical value or small range included in the range should be construed as being specifically described even if there is no specific description.

1: portable device 2: atmospheric pressure detection means 3: atmospheric pressure change rate calculation means 4: control means 5: photographing means 100, 200: portable terminal (mobile device)
101: Antenna (ANT1)
102: wireless transmission / reception unit 103: control unit 104: operation unit 105: microphone 106: receiver 107: speaker 108: camera unit 109: barometer 110: storage unit 111: acceleration sensor 112: display unit 113: GPS reception unit 114: GPS Antenna (GPS-ANT)
115: Water detection sensors C1, C1 ′: Pressure C2: Pressure change rate C3: Imaging conditions

Claims (10)

Photographing means;
Atmospheric pressure detection means for detecting atmospheric pressure;
An atmospheric pressure change rate calculating means for calculating an atmospheric pressure change rate based on the atmospheric pressure;
Control means for changing the photographing condition of the photographing means based on the rate of change in atmospheric pressure;
A portable device comprising:   The control means determines that the portable device is underwater when the rate of change in atmospheric pressure is greater than or equal to a predetermined value, and changes the photographing condition of the photographing means to the underwater photographing condition. A portable device according to claim 1.   When the atmospheric pressure detected by the atmospheric pressure detection means approaches the atmospheric pressure within a predetermined range, the control means determines that the portable device has moved from underwater to the atmosphere, and applies the underwater shooting conditions. The portable device according to claim 2, wherein the portable device is stopped. A water detection sensor;
The control means determines that the air pressure change rate is equal to or greater than a predetermined value and the water detection sensor detects water and is underwater, and changes the photographing condition of the photographing means to an underwater photographing condition; The portable device according to claim 2, wherein:   The portable device according to claim 2, wherein the control unit counts the underwater usage time and notifies the user of the underwater usage time.   The mobile device according to claim 5, wherein an alarm is notified to a user when the underwater use time and the atmospheric pressure exceed a waterproof condition of the mobile device.   6. The storage unit records one or more of the underwater use time, the start time of the underwater use time, the end time of the underwater use time, and the atmospheric pressure determined to be underwater. 6. The portable device according to 6. A method for controlling a portable device provided with a photographing means,
Measuring atmospheric pressure;
Calculating an atmospheric pressure change rate based on the atmospheric pressure;
An imaging condition changing step for changing the imaging condition of the imaging means based on the atmospheric pressure change rate;
A method for controlling a portable device, comprising:   The photographing condition changing step determines that the portable device is underwater when the atmospheric pressure change rate is a predetermined value or more, and changes the photographing condition of the photographing unit to underwater photographing conditions. Item 9. A method for controlling a portable device according to Item 8. A program for controlling a portable device provided with photographing means,
A process of calculating the rate of change in atmospheric pressure based on the measured atmospheric pressure;
A process of changing the photographing condition of the photographing means based on the atmospheric pressure change rate;
A program that causes a computer to execute.

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