JP2011142488A - Portable terminal, photometry area selection method, photometry area selection program, and program recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal which can more accurately measure a luminance of a subject that is an bject of photographing, when a center-focused photometry system is used, photoraphing the subject by using camera functions, and allows setting an appropriate exposure amount. <P>SOLUTION: When the center-focused photometry system is applied at photographing a subject, in a person photographic mode or in an object photographic mode, the terminal analyzes the distribution of colors of respective pixels contained in a photometry area of the center focused photometry system (a step S404). If the number of pixels with a special color specified beforehand is larger than a predetermined threshold (Yes in step S405), the direction of gravity is confirmed by an acceleration sensor (step S406); the photometry area is moved to the gravity direction (step S407); and performs photometry by using the photometry area, after the movement. In this case, it is possible to use the color of the sky or the color of darkness as a specified color (step S405). It is also possible to change the specified color to a different color for setting, according to a plurality of time zones. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a portable terminal, a photometric area selection method, a photometric area selection program, and a program recording medium, and in particular, a portable that enables selection of a photometric area in which an appropriate exposure amount for a subject to be photographed can be obtained in the camera function of the portable terminal. The present invention relates to a terminal, a photometric area selection method, a photometric area selection program, and a program recording medium.

  Currently, many commercially available mobile terminals such as mobile phone cameras have an automatic exposure (AE) function. The automatic exposure function measures the brightness of the subject and automatically changes the exposure amount calculated based on the measured photometric value of the subject brightness to the appropriate exposure amount by changing the shutter speed. It is controlled to shoot with setting.

  Here, there are a center-weighted metering method and an average metering method as a metering method for measuring the luminance of a subject. Center-weighted metering is a function that divides the shooting screen into multiple areas and performs metering for each area, but measures the subject brightness with emphasis on the metering area at the center of the screen, and is located at the center of the screen. Consideration is given so that the subject is properly exposed. In general, the center-weighted metering method is used in a shooting mode in which the subject is assumed to be near the center of the screen, such as a person shooting mode. On the other hand, the average metering method is a function that divides the shooting screen into a plurality of areas and measures the light for each area to measure the average subject brightness of the entire screen. Generally, the average metering method is used for landscape photography. It is used in a shooting mode when the entire screen is a subject such as a mode.

  However, when the subject is photographed in the center using the center-weighted metering method, if there are many extremely bright subjects such as a clear sky or a light source in the metering area, the brightness of the metering area near the center Is detected high. As a result, the luminance photometric value is increased, so that the shutter speed is increased in an attempt to suppress the exposure amount, and the subject to be originally photographed is darkly photographed.

  For this reason, in Japanese Patent Application Laid-Open No. 2000-184271 “Digital Still Camera” of Patent Document 1, it is considered that a brighter direction is considered as a light source (ceiling) by dividing the photometric area, and it is estimated that a subject is present. Proposes a method of performing side (ground side) photometry.

  Japanese Patent Laid-Open No. 2008-244587 of “Patent Document 2”, “Camera and Electronic Equipment”, proposes a method of determining backlight based on a difference between face luminance and peripheral luminance.

JP 2000-184271 A (page 4-5) Japanese Unexamined Patent Publication No. 2008-244587 (page 9-12)

  However, in the case of the method as described in Patent Document 1, if there is a light source in the vicinity of the subject, the photometry area is set to the darkest part on the screen. Can not. Further, in the case of the method as described in Patent Document 2, when the subject does not have a face, the backlight cannot be determined.

  The present invention has been made in view of such circumstances, and when photographing a subject using a camera function, when performing photometry using the center-weighted photometry method, an image analysis is performed on the area near the center of the screen to be metered. Based on the result, the photometry area is moved, the luminance of the subject to be imaged is measured more accurately, and a suitable exposure amount can be set, a portable terminal, a photometry area selection method, a photometry area selection program, and a program The purpose is a recording medium.

  In order to solve the above-described problems, the mobile terminal according to the present invention employs the following characteristic configuration.

  (1) In a portable terminal equipped with a camera for photographing a subject, the distribution of colors of each pixel included in the photometry area in the center-weighted photometry method is analyzed, and the number of pixels having a specific color set in advance is A portable terminal that performs photometry for determining an exposure amount by moving the photometric area in the direction of the center of gravity and using the new photometric area after the movement when the threshold is greater than a predetermined threshold.

  According to the portable terminal, the photometry area selection method, the photometry area selection program, and the program recording medium of the present invention, when performing camera shooting, it is determined in advance by paying attention to the color of each pixel in the photometry area in the center-weighted photometry method. When the number of pixels having a specific color, for example, a bright sky color or a dark color such as darkness, exceeds a predetermined threshold value, the photometric area is more subject to be photographed along the direction of gravity. Since the exposure amount with respect to the subject is corrected to an appropriate value by moving in the direction of position and performing photometry again, the following effects can be obtained.

  First, when the center-weighted metering method is selected as the metering method in the person photographing mode or the object photographing mode, the subject is located in the metering region where the background is mostly occupied by the bright sky or the opposite darkness. Even if it is, it is possible to obtain an appropriate exposure amount to the subject without being affected by the brightness of the bright sky or the darkness of darkness. Therefore, for example, even when the subject is present in the background where the bright sky is mostly occupied, it is possible to prevent the subject from becoming black as a captured image. Even when the subject is present in the background where the darkness is the majority, it is possible to prevent the subject from being over-exposed as a captured image.

  Second, since the trigger for re-measurement by moving the photometry area in the gravitational direction is determined by a specific color regardless of the specific luminance in the photometry area, the specific color has a predetermined threshold value. As long as it does not increase more than that, the photometric area does not move, and the brightness of the captured image can be stabilized.

  Thirdly, when moving the photometric area, the gravitational direction is detected and the photometric area is moved in the detected gravitational direction, so only when attempting to shoot with the screen of the mobile terminal in the vertical or horizontal direction. Instead, even in the case of shooting in an oblique direction or 180 degrees, the photometry area can be moved in an appropriate direction where more subjects are assumed to be located.

It is a schematic diagram for demonstrating the selection method of the photometry area | region of the portable terminal which concerns on this invention. It is a block block diagram which shows the internal structural example of the mobile telephone which is an example of the portable terminal which concerns on this invention. It is a schematic diagram which shows an example of the external appearance of the mobile telephone shown in FIG. 4 is a flowchart for explaining an example of the operation of the mobile terminal according to the present invention, taking the case of the mobile phone of FIGS. 2 and 3 as an example; 4 is a flowchart for explaining another example of the operation in the case of the mobile phone of FIGS. 2 and 3 which is an example of the mobile terminal according to the present invention. It is a schematic diagram for demonstrating the selection method of the photometry area | region of the portable terminal until now.

  Preferred embodiments of a portable terminal, a photometric area selection method, a photometric area selection program, and a program recording medium according to the present invention will be described below with reference to the accompanying drawings. In the following description, the portable terminal and the photometry area selection method according to the present invention will be described. However, the photometry area selection method may be implemented as a photometry area selection program executable by a computer, or Needless to say, the photometry area selection program may be recorded on a computer-readable recording medium.

  In the following description of the embodiment, a mobile phone will be described as an example of the mobile terminal according to the present invention, but the mobile terminal according to the present invention is not limited to such a case. For example, any portable terminal having a camera function such as a PHS (Personal Handy-Phone System) terminal, a personal digital assistant (PDA), a portable notebook PC (Personal Computer), a portable music player, etc. It may be a terminal.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention relates to a method for selecting a photometric area of a camera function in a mobile terminal, particularly a mobile phone. When there are many specific colors in pixels included in the photometry area, an appropriate exposure amount for the subject to be imaged is obtained by moving the photometry area of the camera module in the direction of gravity.

  Specifically, in the photometric area selection method of a portable terminal, for example, a mobile phone, up to now, as shown in FIG. 6, the image of the photometry area 11 near the center of the screen to be measured by the center-weighted photometry method is analyzed as it is. However, for the background of the person who is the subject 1, for example, when many colors of the bright sky 2 are included, if the exposure amount is calculated by directly analyzing the image in the photometry area 11 of the center-weighted photometry, the bright sky 2 is calculated. The calculation is performed using a lot of luminance. Thus, the subject 1 is mistakenly determined to be a bright image, and the shutter speed increases to suppress the exposure amount, and the image of the person who is the subject 1 is captured darkly. FIG. 6 is a schematic diagram for explaining a photometric area selection method of the mobile terminal up to the present, in which a bright sky 2 is included as a background of the subject 1 in the photometric area 11 measured by the center-weighted photometry method. Is shown.

  Therefore, in the photometric area selection method for a mobile terminal, for example, a mobile phone, according to the present invention, a predetermined specific color, for example, a bright sky 2 color, is used as a pixel included in the photometry area 11 of FIG. When there are many, as shown in FIG. 1, it controls so that the photometry area | region 11 near the center of the screen photometrically measured by the center weighted photometry method is moved in the direction of gravity where more persons as the subject 1 are located. Then, by using the photometry area 12 moved in the gravitational direction and performing photometry in an area where the subject 1 is located more, correction is made so that an appropriate exposure amount for the person who is the subject 1 is obtained. Yes. FIG. 1 is a schematic diagram for explaining a photometric area selection method of a mobile terminal according to the present invention, and a gravitational direction in which more persons who are subjects 1 are located in a photometric area measured by a center-weighted photometry method. The photometry area 12 moved in the gravitational direction is controlled so as to perform photometry as an area where an appropriate exposure amount for the subject 1 can be calculated.

  Thus, even if the bright light 2 is included as the background of the subject 1 in the photometric area 11 near the center of the screen for photometry by the center-weighted photometry as shown in FIG. 12, the area of the sky 2 as the background is reduced, and it is possible to calculate an appropriate exposure amount for the person who is the subject 1 as a photometric result of the photometric area 12.

  In other words, in the present invention, the subject 1 is positioned more by the acceleration sensor even when metering is performed with the center-weighted metering method in the person photographing mode for photographing a person or the object photographing mode for photographing an object such as a still life. The gravitational direction is detected and moved from the photometric area 11 at the center of the screen toward the photometric area 12 toward the detected gravitational direction, and a light source exists in the vicinity of the subject as in Patent Document 1. The problem in case can be eliminated. Furthermore, in the present invention, the distribution of the designated color is analyzed for the color of each pixel in the photometry area using a color designated in advance as a specific color, for example, the bright sky 2 color, and the photometry area is bright. Whether or not there is a lot of sky 2 is determined to determine whether or not the luminance for subject 1 is appropriate, and the face of the subject as in Patent Document 2 cannot be detected. The problem in case can be eliminated.

(Configuration example of embodiment)
Next, a configuration example of the portable terminal according to the present invention will be described with reference to FIG. FIG. 2 is a block configuration diagram showing an internal configuration example of a mobile phone which is an example of a mobile terminal according to the present invention.

  A mobile phone 100 shown in FIG. 2 as an example of the mobile terminal according to the present invention includes a CPU 101, a ROM 102, a RAM 103, a data processing unit 104, a transmission / reception unit 105, a key input unit 201, a liquid crystal display unit 211, a sensor control unit 221, and an acceleration sensor. 222, a camera control unit 231, a camera 232, an LED control unit 241, and an LED 242.

  The CPU 101 is a processing device that controls the entire mobile phone 100. The CPU 101 is connected to each circuit unit in the mobile phone 100 via a bus.

  The ROM 102 is a read-only storage device (Read Only Memory), and includes various control programs for performing operations such as image analysis, acceleration sensor control, camera control, LED control, and reading of various information executed by the CPU 101. Various data such as color data used for determining a specific color, for example, sky color, photographed photo data, exposure amount, and shutter speed are stored.

  A RAM 103 is a random access memory device that can be read and written (Random Access Memory), and is an area in which a control program and data necessary for the CPU 101 to perform processing are developed.

  The data processing unit 104 is configured by a DSP (Digital Signal Processor) or the like, analyzes color data included in the photometry area, and analyzes how much a specific color stored in the ROM 102, for example, a sky color is included. Image analysis processing for a specific color included in the photometric area, for example, a sky color when moving beyond the predetermined threshold to confirm the gravitational direction for moving the photometric area and to calculate the amount of movement, etc. A processing unit that performs image processing of captured image data such as vector calculation processing and encoding of captured image data.

  The transmission / reception unit 105 is a part for performing data transmission / reception between the mobile phone 100 and the base station as a mobile communication system, and performs transmission / reception of audio data and image data.

  The key input unit 201 includes a numeric keypad, a camera function start key, a camera shooting start key, a menu start key, and the like, and is a part that receives key information input from the user and transmits it to the CPU 101. Note that the key input unit 201 is also provided with a direction input device for inputting direction data in which the mobile phone 100 is facing.

  The liquid crystal display unit 211 is an LCD (Liquid Crystal Display), and includes various information on camera functions, information on camera live views, confirmation images after camera shooting, various types of information stored in the mobile phone 100, and information on user interfaces. Etc. are displayed on the screen.

  The sensor control unit 221 is a control unit that performs control of the acceleration sensor 222 and output analysis of the acceleration sensor 222. The acceleration sensor 222 is a two-dimensional or three-dimensional acceleration sensor for detecting gravity, and is a device that measures the posture with respect to the ground from the sum of acceleration vectors. In the present embodiment, the acceleration sensor 222 detects the direction of gravity. Used for.

  The camera control unit 231 is a control unit that performs control of the camera 232, designation of a photometric area, and reception processing of output data of the camera 232. The camera 232 is a camera module on which a lens and a camera sensor are mounted.

  The LED control unit 241 is a control unit that performs lighting control, blinking control, and color control of an LED (Light Emitting Diode) 242 that is a light emitting diode. The LED 242 is a part for notifying the user of various types of information output from the mobile phone 100 by lighting or blinking.

  Next, an example of the appearance of the mobile phone 100 shown in FIG. 2 will be described with reference to the schematic diagram of FIG. 3 is a schematic diagram showing an example of the appearance of the mobile phone 100 shown in FIG. 2, FIG. 3 (A) shows a front view of the front side of the mobile phone 100 of FIG. 2, and FIG. FIG. 3 shows an external rear view of the back side of the mobile phone 100 of FIG. In the external view of FIG. 3, the surface to which the liquid crystal display unit 211 is attached is referred to as the front surface, and the surface opposite to the surface to which the liquid crystal display unit 211 is attached is referred to as the back surface.

  In addition to the liquid crystal display portion 211, a key input portion 201 is attached to the surface of the mobile phone 100 in FIG. The key input unit 201 includes a camera function start key, a camera shooting start key, and the like. The user can operate a shooting shutter of the camera 232 while checking an image displayed on the liquid crystal display unit 211. As can be done, the key input unit 201 is attached to the same surface as the liquid crystal display unit 211, that is, the front surface side of the mobile phone 100.

  On the other hand, a camera 232 and an LED 242 are attached to the back surface of the mobile phone 100 in FIG. That is, the camera 232 is attached to the surface opposite to the liquid crystal display unit 211, that is, the back surface side of the mobile phone 100 so that the liquid crystal display unit 211 can be used as a camera live view. Further, the LED 242 is lit or blinked to notify the user or the person of the subject of the internal state of the mobile phone 100 and displays that the camera is being photographed. In order to prevent theft, the mobile phone 100 is attached to the back side.

(Description of operation of embodiment)
Next, an example of the operation of the mobile phone 100 of FIGS. 2 and 3 shown as an example of the mobile terminal according to the present invention will be described with reference to the flowchart of FIG. FIG. 4 is a flowchart for explaining an example of the operation of the mobile terminal according to the present invention taking the case of the mobile phone 100 of FIGS. 2 and 3 as an example.

  First, when the user operates the camera function activation key provided in the key input unit 201 of the cellular phone 100, the flowchart of FIG. 4 is activated (step S401), and the CPU 101 controls the camera from the menu of the cellular phone 100. When the function is activated, the camera 232 is activated via the camera control unit 231 of the mobile phone 100 (step S402).

  When the camera 232 is activated, the CPU 101 controls the camera module of the camera 232 to start capturing the captured image into the RAM 103 via the camera control unit 231, and the liquid crystal display unit 211 serves as a camera live view function. The image captured from the camera module is displayed on the screen (step S403).

  When capturing of the captured image from the camera module to the RAM 103 is started, the data processing unit 104 is driven under the control of the CPU 101. Unlike the landscape shooting mode, in the person shooting mode or the object shooting mode, A center-weighted metering method that is optimal for these photographing modes is selected, and an area centered at the center of the screen of the liquid crystal display unit 211 is recognized as a metering area for an image captured from the camera module. Thereafter, the data processing unit 104 analyzes the distribution of the color data of each pixel included in the recognized photometric area, and determines how much a specific color, for example, a sky color, stored in advance in the ROM 102 is included. It is calculated as the existence ratio of a specific color such as a bright sky color (the ratio of the number of pixels having a specific color such as a bright sky color) (step S404). Here, the specific color such as the sky color can be arbitrarily set by the user, and the set specific color such as the sky color is stored in the ROM 102 in advance.

  Further, the data processing unit 104 compares the calculated presence ratio of the specific color, for example, the sky color, in the photometric area with the threshold value stored in advance in the ROM 102 (step S405), and determines the specific color, for example, the sky color. Is less than the threshold (No in step S405), the exposure amount to the subject calculated using the photometric result in the photometric area in the center of the screen of the liquid crystal display unit 211 is appropriate. The image is taken into the RAM 103 from the camera module and displayed on the liquid crystal display unit 211 as a captured image in the RAM 103, and the process ends (step S408). .

  On the other hand, when the ratio of the specific color, for example, the sky color, in the photometric area is larger than the threshold (Yes in step S405), the photometric result in the photometric area at the center of the screen of the liquid crystal display unit 211 is used. It is determined that the calculated exposure amount for the subject is not an appropriate exposure amount, that is, the exposure amount to the subject is too small, for example, because there are too many bright sky colors in the photometry area. After the determination, the operation proceeds to the operation of moving the photometry area and performing photometry again.

  First, under the control of the CPU 101, the direction of gravity in the mobile phone 100 is confirmed based on the acceleration information obtained from the acceleration sensor 222 via the sensor control unit 221, and notified to the data processing unit 104 (step S406). ). In general, when taking a picture with the mobile phone 100, the liquid crystal display unit 211 is used not only when the screen of the liquid crystal display unit 211 is used in landscape orientation or when the screen of the liquid crystal display unit 211 is used in portrait orientation. It is also assumed that the screen is used at an angle. On the other hand, generally, more people and objects are subjects in the direction of gravity. Therefore, the direction in which the photometry area for photometry is moved in order to calculate an appropriate exposure amount for the person or object that is the subject is not simply the vertical or horizontal direction of the mobile phone 100, but more subjects are located. It is desirable to move along the direction of gravity, which is the direction in which it is located.

  Next, the data processing unit 104 that has acquired the gravitational direction in the mobile phone 100 calculates the amount of movement in the acquired gravitational direction, and has acquired the photometric area that was in the center of the screen of the liquid crystal display unit 211. The calculated amount of movement is moved in the direction of gravity (step S407). Here, when the photometric area cannot be simply moved, after dividing the screen into a plurality of areas instead of moving, for example, as described in Japanese Patent Application Laid-Open No. 2004-078008 “Camera”. The region closest to the gravitational direction is selected as a new photometric region for calculating the exposure amount for the subject.

  When the movement of the photometry area is completed, the exposure amount for the subject is corrected as an appropriate exposure amount using the photometry result in the moved new photometry area, and then taken into the RAM 103 from the camera module and displayed on the liquid crystal display unit 211. The image being stored is stored in the RAM 103 as a captured image, and the process is terminated (step S408).

  In the above description, as a predetermined specific color in the photometric area in the center-weighted photometry method, a bright sky color (that is, a specific blue color) is taken as an example, and a bright sky color like this is used. Since the number of pixels is greater than a predetermined threshold value, the exposure amount for the subject to be photographed is reduced, and the subject is determined to appear dark. It is not limited to a bright color like the sky color.

  For example, a dark color such as dark night can be used as a specific color, and the number of pixels having a dark color as a background is greater than a predetermined threshold, so that the exposure amount to the subject to be photographed is large. It may be determined that the subject is photographed in a state where the subject is out of focus, and in such a case, the photometry area is moved in the direction of gravity where more subjects are supposed to be located, and the subject including the subject is moved. By performing photometry in the vicinity, control is performed so that an appropriate exposure amount for the subject is calculated.

  In addition, an example in which a bright sky color predetermined as a specific color is a hue including a specific blue color is shown. However, as shown in the flowchart of FIG. 5, such a sky color is linked to a clock, You may make it switch to another color according to a time slot | zone. FIG. 5 is a flowchart for explaining another example of the operation in the case of the mobile phone 100 of FIGS. 2 and 3 which is an example of the mobile terminal according to the present invention. Correspondingly, the case of switching to two different colors is illustrated. However, it is not limited to two colors, and may be switched to different colors according to a plurality of time zones.

  Here, the flowchart of FIG. 5 is activated at a predetermined cycle. When the predetermined activation cycle is reached (step S501), the current time indicated by the clock provided in the mobile phone 100 is registered in advance. The set time is compared (step S502).

  If the current time has not reached the set time (Yes in step S502), the sky color predetermined as the specific color is set to the color 1 registered in advance. On the other hand, when the current time has reached the set time or exceeds the set time (No in step S502), the sky color predetermined as the specific color is different from the color 1 Set to color 2, which is registered in advance as color.

  As described above, instead of a fixed color as the specific color, the specific color can be changed according to the time. Furthermore, the specific color may be set to an arbitrary color designated by the user of the mobile phone 100 via the key input unit 201.

(Explanation of effect of embodiment)
As described in detail above, in the present embodiment, when performing camera shooting in the person shooting mode or the object shooting mode, it is determined in advance by paying attention to the color of each pixel in the photometry area in the center-weighted photometry method. When the number of pixels having a specific color, for example, a bright sky color or a dark color such as darkness, exceeds a predetermined threshold value, the photometric area is more subject to be photographed along the direction of gravity. Since the exposure amount with respect to the subject is corrected to an appropriate value by moving in the direction of position and performing photometry again, the following effects can be obtained.

  First, when the center-weighted metering method is selected as the metering method in the person photographing mode or the object photographing mode, the subject is located in the metering region where the background is mostly occupied by the bright sky or the opposite darkness. Even if it is, it is possible to obtain an appropriate exposure amount to the subject without being affected by the brightness of the bright sky or the darkness of darkness. Therefore, for example, even when the subject is present in the background where the bright sky is mostly occupied, it is possible to prevent the subject from becoming black as a captured image. Even when the subject is present in the background where the darkness is the majority, it is possible to prevent the subject from being over-exposed as a captured image.

  Second, since the trigger for re-measurement by moving the photometry area in the gravitational direction is determined by a specific color regardless of the specific luminance in the photometry area, the specific color has a predetermined threshold value. As long as it does not increase more than that, the photometric area does not move, and the brightness of the captured image can be stabilized.

  Third, when moving the photometric area, the gravitational direction is detected, and the photometric area is moved in the detected gravitational direction, so the screen of the liquid crystal display unit 211 of the mobile phone 100 should be taken vertically or horizontally. The photometry area is not limited to the case where the object is to be photographed in an oblique direction or 180 degrees, and the photometry area is directed toward an appropriate direction where more subjects are assumed to be located. Can be moved.

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, the embodiment of the present invention can be expressed as the following configuration in addition to the configuration (1) in the means for solving the problems.
(2) The mobile terminal according to (1), wherein the specific color is set by switching to a different color according to a plurality of time zones.
(3) The mobile terminal according to (1) or (2), wherein a bright sky color or a dark color is used as the specific color.
(4) The mobile terminal according to any one of (1) to (3), wherein the shooting mode of the camera is a person shooting mode for shooting a person or an object shooting mode for shooting an object.
(5) A photometric area selection method for a portable terminal equipped with a camera for photographing a subject, wherein the color distribution of each pixel included in the photometry area in the center-weighted photometry method is analyzed, When the number of pixels having a color is greater than or equal to a predetermined threshold, the photometry area is selected to move the photometry area in the direction of the center of gravity and perform photometry to determine the exposure amount using the new photometry area after the movement Method.
(6) The photometric area selection method according to (5), wherein the specific color is set by switching to a different color according to a plurality of time zones.
(7) The photometric area selecting method according to (5) or (6) above, wherein a bright sky color or dark color is used as the specific color.
(8) The photometric area selecting method according to any one of (5) to (7), wherein the camera shooting mode is a person shooting mode for shooting a person or an object shooting mode for shooting an object.
(9) A photometric area selection program in which the photometric area selection method according to any one of (5) to (8) is implemented as a program executable by a computer.
(10) A program recording medium in which the photometric area selection program of (9) is recorded on a computer-readable recording medium.

1 Subject 2 Sky 11 Photometry Area 12 Photometry Area 100 Mobile Phone 101 CPU
102 ROM
103 RAM
104 Data processing unit 105 Transmission / reception unit 201 Key input unit 211 Liquid crystal display unit 221 Sensor control unit 222 Acceleration sensor 231 Camera control unit 232 Camera 241 LED control unit 242 LED

Claims (10)

  In a mobile terminal equipped with a camera for photographing a subject, the color distribution of each pixel included in the photometry area in the center-weighted photometry method is analyzed, and the number of pixels having a preset specific color is determined in advance. A portable terminal that performs photometry to determine an exposure amount by moving the photometric area in the direction of the center of gravity and using the new photometric area after the movement when the threshold is greater than a threshold value.   The mobile terminal according to claim 1, wherein the specific color is set by switching to a different color according to a plurality of time zones.   The mobile terminal according to claim 1, wherein a bright sky color or a dark color is used as the specific color.   The portable terminal according to any one of claims 1 to 3, wherein a shooting mode of the camera is a person shooting mode for shooting a person or an object shooting mode for shooting an object.   A method for selecting a photometric area of a mobile terminal equipped with a camera for photographing a subject, and analyzing a color distribution of each pixel included in the photometric area in the center-weighted photometry method and having a predetermined specific color When the number of pixels is greater than a predetermined threshold, the photometry area is moved in the direction of the center of gravity, and photometry is performed to determine the exposure amount using the new photometry area after the movement. Area selection method.   6. The photometric area selection method according to claim 5, wherein the specific color is set by switching to a different color according to a plurality of time zones.   7. The photometric area selection method according to claim 5, wherein a bright sky color or a dark color is used as the specific color.   The photometric area selection method according to claim 5, wherein the shooting mode of the camera is a person shooting mode for shooting a person or an object shooting mode for shooting an object.   9. A photometric area selection program, wherein the photometric area selection method according to claim 5 is implemented as a program executable by a computer.   10. A program recording medium, wherein the photometric area selection program according to claim 9 is recorded on a computer-readable recording medium.

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