JP2006270547A - Mobile terminal device, method of correcting photographed image in mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire detailed information such as three wavelength used for a three wavelength fluorescent tube as correction information for correcting a photographed image according to artificial lighting, and appropriately correct the photographed image. <P>SOLUTION: A bar code reading part 14 reads lighting information when the lighting information printed as a bar code on the artificial lighting is read by a camera part 13. An OCR reading part 15 reads the lighting information when the lighting information is read when the lighting information printed as characters on the artificial lighting is photographed by the camera part 13. A camera control part 17 performs image correction using the three wavelength information as correction information when the three wavelength information is read as lighting information by the bar code reading part 14 or the OCR reading part 15. Moreover, the camera control part 17 performs image correction using three wavelength information acquired from a lighting database 281 as the correction information when only information of a manufacturer's name and a device number is read from the bar code reading part 14 or the OCR reading part 15 as the lighting information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile terminal device equipped with a camera such as a mobile phone, a PHS (Personal Handyphone System), a PDA (Personal Data Assistance), and a captured image correction method in the mobile terminal device.

  Many mobile terminal devices such as mobile phones, PHS, and PDAs are equipped with cameras for applications such as videophones. In this type of portable terminal device, when photographing with a camera indoors, it is affected by the color temperature peculiar to artificial lighting and intermittent lighting. For this reason, it is preferable to correct the captured image in accordance with the artificial illumination to be used when shooting indoors.

For example, Patent Document 1 discloses whether or not the artificial illumination is a three-wavelength fluorescent lamp by detecting the presence or absence of a bright line (for example, 436 nm or 546 nm) peculiar to a three-wavelength phosphor when photographing with a camera indoors. Techniques for determining whether or not are disclosed.
JP-A-3-163538

  By the way, in the actual three-wavelength fluorescent lamp, the type of phosphor used and the proportion of the phosphor blend are different for each manufacturer or for each model number (model) of each manufacturer. , G (Green), and B (Blue) are also different in wavelength.

  Therefore, in order to appropriately correct the captured image, it is necessary to acquire information on the three wavelengths used for the three-wavelength fluorescent lamp and correct the captured image using the information on the three wavelengths as correction information. However, with the technique disclosed in Patent Document 1, it is only possible to determine whether the artificial illumination is a three-wavelength fluorescent lamp, and it is not possible to acquire information on three wavelengths used for the three-wavelength fluorescent lamp.

  Therefore, an object of the present invention is to appropriately correct a captured image by acquiring detailed information such as three wavelengths used for a three-wavelength fluorescent lamp as correction information for correcting the captured image according to artificial lighting. An object of the present invention is to provide a portable terminal device and a captured image correction method in the portable terminal device.

  The portable terminal device of the present invention is a portable terminal device that corrects a photographed image in accordance with artificial lighting to be used when photographing indoors.

  The portable terminal device according to the first aspect of the present invention includes a camera that captures an image, and when the illumination information printed on artificial illumination is captured by the camera, the illumination information is obtained from the captured image. An information reading unit that reads, and a camera control unit that acquires correction information used for correcting the captured image based on the illumination information read by the information reading unit, and corrects the captured image using the acquired correction information. It is characterized by having.

  According to this configuration, regular illumination information printed on the artificial illumination by each manufacturer is read, and correction information is acquired based on the read illumination information. Information on the three wavelengths to be used can be easily acquired, and the captured image can be corrected more appropriately.

  When the correction information is included in the illumination information read by the information reading unit, the correction information is acquired from the illumination information, and the correction information is not included in the illumination information. May search a database in which the illumination information and the correction information are registered in association with each other, and acquire the correction information from the database.

  According to this configuration, for example, if information on three wavelengths used for the three-wavelength phosphor is printed as illumination information, information on three wavelengths can be acquired as correction information. Even if the information on the three wavelengths used for the three-wavelength phosphor is not printed as the illumination information, the information on the three wavelengths can be acquired as the correction information by searching the database based on the illumination information.

  The mobile terminal device according to the second aspect of the present invention includes a camera that captures an image and, when captured by the camera, a predetermined item for light emitted from artificial illumination based on the captured image. Photometry means for performing measurement, and camera control for obtaining correction information used for correcting the photographed image based on measurement information indicating the measurement result measured by the photometry means, and correcting the photographed image using the obtained correction information Means.

  According to this configuration, the light emitted from the artificial illumination is directly measured, and correction information is obtained based on the measured measurement information. Therefore, more detailed correction information, for example, three wavelengths used for a three-wavelength phosphor. This information can be easily acquired, and the captured image can be corrected more appropriately.

  The camera control means acquires the correction information from the measurement information when the correction information is included in the measurement information measured by the photometry means, and the correction information is included in the measurement information. If not included, a database in which the illumination information and the correction information are associated and registered may be searched to acquire the correction information from the database.

  According to this configuration, for example, if a measuring unit that measures information on three wavelengths used for a three-wavelength phosphor is used, information on three wavelengths can be acquired as correction information. Further, if a measuring unit that measures light intensity or the like is used, information on three wavelengths can be acquired as correction information by searching a database based on the measurement result.

  As described above, according to the present invention, the correction information is acquired by reading the regular illumination information printed on the artificial illumination, so that detailed correction information used for correcting the captured image can be acquired. As a result, an effect that the captured image can be corrected more appropriately can be obtained.

The best mode for carrying out the present invention will be described below with reference to the drawings. Here, a case where the mobile terminal device of the present invention is applied to a mobile phone will be described as an example.
(First embodiment)
As an indoor light source, artificial lighting, in particular, a three-wavelength fluorescent lamp (hereinafter simply referred to as “fluorescent lamp”) is generally used. A fluorescent lamp has high efficiency and high color rendering by appropriately blending three colors of rare earth phosphors that emit light in each of R (wavelength of about 610 nm), G (wavelength of about 540 nm), and B (wavelength of about 450 nm). Both are compatible. Further, by changing the blending ratio of these rare earth phosphors, a wide range of light colors and spectral distributions can be realized. By intermittently lighting these three-color rare earth phosphors and additively mixing them according to the three primary colors of light, it looks as if white light is emitted to the naked eye.

  On current fluorescent lamps, lighting information such as manufacturer name and model number is printed as characters by laser marking or the like. The three wavelengths used in fluorescent lamps differ from manufacturer to manufacturer or model number (model). Therefore, each maker can print not only the manufacturer name and model number but also illumination information including information on three wavelengths used in the fluorescent lamp as characters on the fluorescent lamp. It is also possible to print the illumination information on a fluorescent lamp as a barcode such as a JAN (Japan Article Number) code or a QR (Quick Response) code.

  Therefore, in the present embodiment, when photographing indoors, the illumination information printed as characters or barcodes on the artificial illumination is photographed, and the illumination information is read from the photographed image to be used for artificial illumination. Information on three wavelengths is acquired as correction information.

  Referring to FIG. 1, the mobile phone according to the present embodiment includes a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a camera unit 13, a barcode reading unit 14 serving as information reading means, and an OCR (OCR). Optical Character Reader) reading unit 15, flicker detection unit 16, camera control unit 17, work memory 18, timer unit 19, display unit 20, display control unit 21, transmission / reception unit 22, and input unit 23.

  The CPU 11 controls each component connected via the bus.

  The ROM 12 is a memory that stores various control programs executed by the CPU 11 and fixed data such as a dictionary used for kana character conversion.

  The camera unit 13 is a camera that captures an image.

  The barcode reading unit 14 captures the barcode printed on the artificial illumination by the camera unit 13 when the illumination information such as the manufacturer name, model number, and three-wavelength information is printed on the artificial illumination as a barcode. Then, illumination information such as manufacturer name, model number, and three wavelengths is read from the photographed barcode.

  The OCR reading unit 15, when illumination information such as manufacturer name, model number, and information on three wavelengths is printed as characters on the artificial lighting, when the characters printed on the artificial lighting are photographed by the camera unit 13, Read illumination information such as manufacturer name, model number, and 3 wavelengths from the photographed characters.

  The flicker detection unit 16 detects the flicker frequency and the blinking timing when flicker occurs in the artificial illumination based on the image taken by the camera unit 13. Flicker is a phenomenon peculiar to fluorescent lamps, and is a difference between light and dark that occurs in the blinking cycle of fluorescent lamps, and is not generated by sunlight or halogen light.

  The camera control unit 17 controls the shooting of the camera unit 13. Specifically, the camera control unit 17 acquires correction information used for correcting the captured image based on the illumination information read by the barcode reading unit 14 or the OCR reading unit 15, and captures the image based on the acquired correction information. Correct the image.

  For example, when the three-wavelength information is read as illumination information by the barcode reading unit 14 or the OCR reading unit 15, the camera control unit 17 uses the read three-wavelength information as the correction information, and the white of the camera unit 13. By adjusting the balance, the photographed image is corrected, and the color rendering as seen in the actual indoor environment is faithfully reproduced.

  Further, the camera control unit 17 does not read the information of the three wavelengths by the barcode reading unit 14 or the OCR reading unit 15, and if only the information of the manufacturer name and the model number is read, the information of the read manufacturer name and the model number And access to the illumination database 281 provided in the work memory 18 registered in association with the information on the three wavelengths, acquire the information on the three wavelengths from the illumination database 281, and correct the acquired three-wavelength information Image correction is performed using the information. An example of information recorded in the illumination database 281 is shown in FIG.

  Alternatively, when only the information of the manufacturer name or model number is read by the barcode reading unit 14 or the OCR reading unit 15, the camera control unit 17 is the same as the illumination database 281 provided in an external server (not shown) on the Internet. The three-wavelength information is acquired from the database, and image correction is performed using the acquired three-wavelength information as correction information. The address of the external server on the Internet may be printed as address information in bar code or characters on artificial lighting. In this case, the camera control unit 17 accesses the database provided in the external server via the transmission / reception unit 22 based on the address information read by the barcode reading unit 14 or the OCR reading unit 15. . Alternatively, the address of the external server on the Internet may be a predetermined address.

  The camera control unit 17 also determines the contribution rate (ratio) of each artificial illumination based on the measurement result of the light amount (measured by the camera unit 13 or the like) even when a plurality of artificial illuminations are used in combination. The three-wavelength information of each artificial illumination can be adjusted according to the contribution rate, and image correction can be performed using this as correction information. In addition, even when artificial lighting and solar lighting are used in combination, the camera control unit 17 determines the contribution ratio (ratio) between the artificial lighting and the solar lighting based on the measurement of the light amount, and the three wavelengths of the artificial lighting. Information can be adjusted according to the contribution ratio with solar illumination, and this can be used as correction information to perform image correction.

  In the present invention, any known technique can be used for correcting the captured image using the information on the three wavelengths, and therefore a detailed description regarding correction of the captured image using the information on the three wavelengths is omitted. To do.

  The camera control unit 17 also corrects the captured image using the flicker detection information such as the flicker frequency and the blinking timing detected by the flicker detection unit 16 as correction information. For example, the camera control unit 17 sets the shutter speed of the camera unit 13 to be the same as the flicker lighting timing detected by the flicker detection unit 16.

  The working memory 18 is a RAM (Random Access Memory) or the like in which data temporarily required for the CPU 11 to execute a program is registered. Specifically, the working memory 18 is a lighting in which lighting information such as manufacturer name, model number, and information on three wavelengths is registered for each artificial lighting that is generally well distributed as shown in FIG. A database 281 is included. In the illumination database 281, illumination information for each artificial illumination is registered in advance. However, when the barcode reading unit 14 or the OCR reading unit 15 reads illumination information related to artificial lighting that is not registered in the illumination database 281, the camera control unit 17 newly registers the illumination information in the illumination database 281. It is also possible. The illumination database 281 is not limited to phosphors, and illumination information of tungsten light illumination may be registered. The work memory 18 also includes an illumination information recording unit 282 in which current illumination information is recorded by the camera control unit 17. In addition, the work memory 18 includes a recording area (not shown) in which image data photographed by the camera unit 13 is recorded.

  The timer unit 19 has a function of measuring time.

  The display unit 20 is disposed on the front surface of the mobile phone body, and is a display device such as a monochrome or color liquid crystal panel or organic EL (electrofluorescence).

  The display control unit 21 controls display on the display unit 20.

  The transmission / reception unit 22 transmits / receives various information to / from a base station (not shown) by radio. For example, when the camera control unit 17 performs an operation of acquiring three wavelength information from a database provided in an external server (not shown) on the Internet, the transmission / reception unit 22 acquires the three wavelength information from the external server via the base station. Receive.

  Various information is input to the input unit 23 by the user. For example, in the case of indoor shooting, when artificial lighting and solar lighting are used together, the fact is input by the user.

  Hereinafter, the operation of the mobile phone according to the present embodiment will be described.

  First, an operation in the case of acquiring three-wavelength information as correction information by reading a barcode printed on artificial illumination using the barcode reader 14 will be described with reference to the flowchart of FIG.

  Referring to FIG. 3, when the shooting location is indoors (step 301) and a bar code is printed on artificial lighting (step 302), the bar code is shot by the user using the camera unit 13 (step 303). ). The barcode is read by the barcode reading unit 14 (step 304). If the barcode cannot be recognized (step 305), the process returns to step 303 and the barcode is taken again.

  Here, when the camera control unit 17 acquires the information on the three wavelengths as a result of reading the barcode by the barcode reading unit 14 (step 306), the information on the three wavelengths together with the manufacturer name and the model number, for example, FIG. As shown in FIG. 4, it is recorded in the illumination information recording unit 182 (step 307). Then, the camera control unit 17 performs image correction using the three-wavelength information recorded in the illumination information recording unit 182, information on the presence / absence of flicker, information on the presence / absence of solar illumination, and the like as correction information. In FIG. 4, the information on the presence / absence of flicker is recorded by the camera control unit 17 based on the flicker detection result by the flicker detection unit 16, and the information on the presence / absence of solar illumination is based on the input to the input unit 23 by the user. It is recorded by the camera control unit 17.

  On the other hand, as a result of reading the barcode by the barcode reading unit 14 in step 306, information on the three wavelengths is not acquired, but if a manufacturer name and model number that can be keywords are acquired (step 308), the camera control unit 17 First, maker name and model number information is recorded in the illumination information recording unit 182 as shown in FIG. 5, for example. In FIG. 5, the information on the presence / absence of flicker is recorded by the camera control unit 17 based on the flicker detection result by the flicker detection unit 16, and the information on the presence / absence of solar illumination is based on the input to the input unit 23 by the user. It is recorded by the camera control unit 17. Next, the camera control unit 17 searches for the three-wavelength information from the illumination database 281 in the work memory 18 or a database in an external server (not shown) using the illumination information of the manufacturer name and model number as keywords (step 309). As a result, if the three-wavelength information is acquired (step 310), the camera control unit 17 records the three-wavelength information in the illumination information recording unit 182 in step 310. Thereby, the illumination information as shown in FIG. 4 is recorded in the illumination information recording unit 182. Then, the camera control unit 17 performs image correction using the three-wavelength information recorded in the illumination information recording unit 182, information on the presence / absence of flicker, information on the presence / absence of solar illumination, and the like as correction information.

  Next, an operation in the case of acquiring three-wavelength information as correction information by reading characters printed on artificial illumination using the OCR reading unit 15 will be described with reference to the flowchart of FIG.

  Referring to FIG. 6, when the shooting location is indoors (step 601) and information on three wavelengths is printed as characters on the artificial illumination (step 602), the characters are photographed by the user using the camera unit 13. (Step 603). This character is read by the OCR reading unit 15 (step 604). If OCR recognition is not possible (step 605), or if wavelength information cannot be acquired even if OCR recognition is possible (step 606), the process returns to step 603. The character indicating the information on the three wavelengths is captured again.

  Here, when the camera control unit 17 acquires the information on the three wavelengths as a result of the OCR reading by the OCR reading unit 15 in step 606, the information on the three wavelengths is shown together with the manufacturer name and the model number, for example, in FIG. Thus, it records in the illumination information recording part 182 (step 607). Then, image correction is performed using the three-wavelength information recorded in the illumination information recording unit 182, flicker presence / absence information, solar illumination presence / absence information, and the like as correction information.

  On the other hand, if the information on the three wavelengths is not printed in step 602, but the information on the manufacturer name and model number that can be used as keywords is printed on the artificial illumination as characters (step 608), the characters are displayed on the camera unit 13 by the user. Is used to photograph (step 609). This character is read by the OCR reading unit 15 (step 610). If the OCR recognition is not possible (step 611), or if the manufacturer name and model number information cannot be acquired even if the OCR recognition is possible (step 612), Returning to step 609, the characters indicating the manufacturer name and model number are again photographed.

  Here, when the information of the manufacturer name and the model number is acquired as a keyword as a result of the OCR reading by the OCR reading unit 15 in step 612, the camera control unit 17 first displays the manufacturer name and model number information, for example, FIG. As shown in FIG. 5, it is recorded in the illumination information recording unit 182. Next, the camera control unit 17 searches the three-wavelength information from the illumination database 281 in the work memory 18 or a database in an external server (not shown) using the illumination information of the manufacturer name and model number as keywords (step 613). As a result, if the three-wavelength information is acquired (step 614), the camera control unit 17 records the three-wavelength information in the illumination information recording unit 182 in step 607. Thereby, information as shown in FIG. 4 is recorded in the illumination information recording unit 182. Then, the camera control unit 17 performs image correction using the three-wavelength information recorded in the illumination information recording unit 182, information on the presence / absence of flicker, information on the presence / absence of solar illumination, and the like as correction information.

  As described above, in the present embodiment, in the barcode reading unit 14 or the OCR reading unit 15, the illumination information printed as characters or barcodes on the artificial illumination is shot by the camera unit 13 when shooting indoors. Then, the illumination information is read from the photographed image, and the three-wavelength information used for artificial illumination based on the illumination information read by the barcode reading unit 14 or the OCR reading unit 15 in the camera control unit 17. Is acquired as correction information, and the image is corrected using the acquired correction information.

  As described above, the camera control unit 17 can acquire not only information indicating that the artificial illumination is a fluorescent lamp but also information on three wavelengths used for the fluorescent lamp as correction information. The captured image can be corrected more appropriately based on the above.

In the present embodiment, both the barcode reading unit 14 and the OCR reading unit 15 are provided. However, the present invention is not limited to this. For example, when illumination information is printed only as a barcode on artificial illumination, only the barcode reading unit 14 can be provided. Alternatively, when the illumination information is printed only as characters on the artificial illumination, only the OCR reading unit 15 can be provided.
(Second Embodiment)
In the first embodiment, the illumination information printed as characters or barcodes on the artificial illumination is read, and the three-wavelength information used for the artificial illumination is acquired as correction information based on the read illumination information. there were. On the other hand, in this embodiment, the light emitted from the artificial illumination is directly measured, and the three-wavelength information used for the artificial illumination is acquired as correction information based on the measurement information indicating the measurement result. Yes.

  Referring to FIG. 7, the cellular phone according to the present embodiment is different from the first embodiment shown in FIG. 1 in that a spectral luminance meter 24 as a photometric means is provided.

  The spectral luminance meter 24 measures the wavelengths of light of R, G, and B colors emitted from artificial illumination. This light is not limited to the direct light directly received from the artificial lighting, but may be indirect reflection light that is reflected from the indoor lighting. The spectral luminance meter 24 can be any known spectral luminance meter, and is not particularly limited as long as it is a general one. Therefore, detailed description of the spectral luminance meter 24 is omitted. .

  In the present embodiment, the spectral luminance meter 24 can directly measure three wavelengths used for artificial illumination. Therefore, the camera control unit 17 can more appropriately correct the captured image using the information on the three wavelengths measured by the spectral luminance meter 24 as the correction information. Further, the spectral luminance meter 24 can perform various measurements (contrast and luminance measurement, etc.) for other light sources as well as fluorescent lamps, and perform spectrum analysis of the measurement results. Therefore, if the camera control unit 17 performs image correction using the spectrum analysis result obtained by the spectral luminance meter 24 as correction information, an image with excellent color reproducibility can be obtained.

  In this embodiment, the barcode reading unit 14 and the OCR reading unit 15 are provided in addition to the spectral luminance meter 24. However, the barcode reading unit 14 and the OCR reading unit 15 may be omitted. Of course it is possible. However, in the case where the barcode reading unit 14 and the OCR reading unit 15 are provided in addition to the spectral luminance meter 24, in an environment in which there is a high possibility of erroneously recognizing information on three wavelengths used for artificial illumination. Even if the information on the three wavelengths acquired based on the measurement result of the luminance meter 24 is incorrect, the image using the information on the three wavelengths obtained based on the normal illumination information printed on the artificial illumination is used thereafter. There is an advantage that it becomes possible to re-correct.

  In the present embodiment, the spectral luminance meter 24 is used as the photometric means, but the present invention is not limited to this. For example, a color filter that passes red, green, and blue pixels and a light intensity measurement unit that measures the light intensity of light that has passed through the color filter of each pixel are provided as photometric means inside the camera unit 13. It is good also as a structure. In the case of this configuration, the camera control unit 17 calculates the ratio (%) of the light intensity of the light that has passed through the color filter of each pixel, and based on the calculated information, the illumination database 281 as shown in FIG. Three-wavelength information can be acquired from a database in an external server (not shown). At this time, as the light intensity of the light that has passed through the color filter of each pixel, an average value of each pixel of red, green, and blue in the entire pixel range may be used, and red, green, You may use the average value of each blue pixel. In addition, a configuration in which a band pass filter that passes red, green, and blue wavelengths and a light intensity measurement unit that measures the light intensity of light that has passed through each band pass filter are provided as photometry means inside the camera unit 13. It is also good. In the case of this configuration, the camera control unit 17 calculates the ratio of the light intensity of the light that has passed through each bandpass filter, and based on the calculated information, the three wavelengths from the illumination database 281 or a database in an external server (not shown). Information can be acquired. At this time, as the light intensity of the light that has passed through the bandpass filter of each wavelength, an average value of each wavelength of red, green, and blue in the entire pixel range may be used, and red, green in the pixels in the predetermined range. Alternatively, an average value of each wavelength of blue may be used. In addition, based on the information that combines the ratio of the light intensity of the light that has passed through each color filter and the ratio of the light intensity of the light that has passed through each bandpass filter, the illumination database 281 or an external server (not shown) Three-wavelength information can also be acquired from the database.

It is a block diagram which shows the structure of the portable terminal device of the 1st Embodiment of this invention. It is a figure which shows an example of the information in the illumination database shown in FIG. 3 is a flowchart illustrating an example of an operation of the mobile terminal device illustrated in FIG. 1. It is a figure which shows an example of the information in the illumination information recording part shown in FIG. It is a figure which shows the other example of the information in the illumination information recording part shown in FIG. 6 is a flowchart illustrating another example of the operation of the mobile terminal device illustrated in FIG. 1. It is a block diagram which shows the structure of the portable terminal device of the 2nd Embodiment of this invention.

Explanation of symbols

11 CPU
12 ROM
DESCRIPTION OF SYMBOLS 13 Camera part 14 Barcode reading part 15 OCR reading part 16 Flicker detection part 17 Camera control part 18 Work memory 19 Timer part 20 Display part 21 Display control part 22 Transmission / reception part 23 Input part 24 Spectral luminance meter

Claims (22)

A portable terminal device that corrects a photographed image according to artificial lighting to be used when photographing indoors,
A camera for taking images,
Information reading means for reading the illumination information from the captured image when the illumination information printed on the artificial illumination is captured by the camera;
A mobile terminal device comprising: camera control means for acquiring correction information used for correcting a captured image based on the illumination information read by the information reading means, and correcting the captured image using the acquired correction information.   The camera control unit acquires the correction information from the illumination information when the correction information is included in the illumination information read by the information reading unit, and the correction information is included in the illumination information. 2. The mobile terminal device according to claim 1, wherein if not, a database in which the illumination information and the correction information are associated and registered is searched, and the correction information is acquired from the database. The database is provided in a server on the Internet provided outside the mobile terminal device,
The information reading means reads the address information from the photographed image when photographing of address information indicating the address on the Internet of the server printed on the artificial illumination by the camera is performed,
The camera control means accesses the database provided in the server on the Internet based on the address information read by the information reading means, and acquires the correction information from the database. The mobile terminal device according to 1. The database is provided in the mobile terminal device,
The mobile terminal device according to claim 2, wherein the camera control unit accesses the database provided in the mobile terminal device and acquires the correction information from the database.   5. The portable terminal device according to claim 1, wherein the information reading unit is a bar code reading unit that reads information printed as a bar code on the artificial illumination. 6.   5. The mobile terminal device according to claim 1, wherein the information reading unit is an OCR reading unit that reads information printed as characters on the artificial illumination. 6. A portable terminal device that corrects a photographed image according to artificial lighting to be used when photographing indoors,
A camera for taking images,
A photometric means for measuring a predetermined item for the light emitted from the artificial illumination based on the photographed image when photographing by the camera;
A mobile terminal device comprising: camera control means for acquiring correction information used for correcting a captured image based on measurement information indicating a measurement result measured by the photometric means, and correcting the captured image using the acquired correction information .   When the correction information is included in the measurement information measured by the photometry unit, the camera control unit acquires the correction information from the measurement information, and the measurement information includes the correction information. If not, the mobile terminal device according to claim 7, wherein a database in which the illumination information and the correction information are registered in association with each other is searched, and the correction information is acquired from the database. The database is provided in a server on the Internet provided outside the mobile terminal device,
The portable terminal device according to claim 8, wherein the camera control unit accesses the database provided in the server on the Internet and acquires the correction information from the database. The database is provided in the mobile terminal device,
The mobile terminal device according to claim 8, wherein the camera control unit accesses the database provided in the mobile terminal device and acquires the correction information from the database. Based on an image taken by the camera, further comprising flicker detection means for detecting the occurrence of flicker in artificial lighting,
11. The mobile terminal according to claim 1, wherein the camera control unit performs image correction using flicker detection information indicating a flicker detection result detected by the flicker detection unit as the correction information. apparatus. A method of correcting a captured image in a mobile terminal device that corrects a captured image according to artificial lighting to be used when shooting indoors,
A first step of reading the illumination information from the photographed image when the illumination information printed on the artificial illumination is captured by the camera;
Captured image correction comprising: a second step of acquiring correction information used for correcting a captured image based on the illumination information read in the first step, and correcting the captured image using the acquired correction information. Method.   In the second step, when the correction information is included in the illumination information read in the first step, the correction information is acquired from the illumination information, and the correction information is included in the illumination information. The captured image correction method according to claim 12, wherein a database in which the illumination information and the correction information are registered in association with each other is searched and the correction information is acquired from the database. . In the first step, when the address information indicating the address on the Internet printed on the artificial illumination by the camera is also taken, the address information is also read from the taken image,
In the second step, based on the address information read in the first step, the database provided in the server on the Internet provided outside the portable terminal device is accessed, and The captured image correction method according to claim 13, wherein the correction information is acquired from a database.   The captured image correction method according to claim 13, wherein in the second step, the database provided in the portable terminal device is accessed and the correction information is acquired from the database.   The photographed image correction method according to claim 12, wherein in the first step, information printed as a barcode on the artificial illumination is read.   The photographed image correction method according to claim 12, wherein in the first step, information printed as characters on artificial illumination is read. A method of correcting a captured image in a mobile terminal device that corrects a captured image according to artificial lighting to be used when shooting indoors,
A first step of measuring a predetermined item with respect to light emitted from artificial lighting based on a photographed image when photographing by a camera is performed;
A second step of acquiring correction information used for correcting the captured image based on the measurement information indicating the measurement result measured in the first step, and correcting the captured image using the acquired correction information. Shooting image correction method.   In the second step, when the correction information is included in the measurement information measured in the first step, the correction information is acquired from the measurement information, and the correction information is included in the measurement information. The photographed image correction method according to claim 18, wherein a database in which the illumination information and the correction information are registered in association with each other is searched and the correction information is acquired from the database. .   The captured image correction according to claim 19, wherein in the second step, the database provided in a server on the Internet provided outside the portable terminal device is accessed, and the correction information is acquired from the database. Method.   The captured image correction method according to claim 19, wherein in the second step, the database provided in the portable terminal device is accessed and the correction information is acquired from the database. A third step of detecting the occurrence of flicker in the artificial lighting based on the image taken by the camera;
The image correction is performed according to any one of claims 12 to 21, wherein in the second step, flicker detection information indicating a flicker detection result detected in the third step is also used as the correction information. Shooting image correction method.

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