JP2014132282A - Image display device, image display method, and program - Google Patents

Abstract

According to the content of image data, the lighting time of a backlight is dynamically controlled to improve the convenience of operation for a user.
An LCD 116 that displays image data and an LCD backlight 17 that lights the LCD 116 for a predetermined time are included. A storage unit 112 that stores image data and lighting time readjustment information for resetting the lighting time of the LCD backlight 117 to a time different from a predetermined time, and an operation unit 111 that selects image data are selected. The image analysis unit 115 for analyzing the image data, and the control unit 113 for setting the lighting time of the backlight unit according to the lighting time readjustment information and the analysis result, the control unit 113 is set to the set lighting time Turn on the backlight.
[Selection] Figure 1

Description

  The present invention relates to an image display device, an image display method, and a program for setting a lighting time of a backlight.

  One function of an electronic device such as a mobile phone is an image viewer function that displays image data such as a photograph taken on a screen. When using this image viewer function, the user browses the displayed image data and then performs an operation such as switching the display to other image data.

  When the image data is displayed on the screen and the user's operation as described above is not performed for a certain period of time, the LCD backlight, which is an LCD (Liquid Crystal Display) provided in the electronic device, Turn off the light directly, or turn it off after faint lighting. The certain time is a lighting time of the LCD backlight that is set in advance in the electronic device.

  Therefore, when the user views the image data using the image viewer function, if any key operation is not performed, the power saving control function in the electronic device is performed regardless of whether the user has finished viewing the image data. For this reason, the LCD backlight was turned off directly, or turned off after being slightly lit.

  For example, Patent Literature 1 and Patent Literature 2 are known as devices that control lighting of a backlight of an electronic device.

  The mobile phone of Patent Document 1 includes an LCD, and determines a time for turning on the LCD backlight based on the font size of characters displayed on the LCD and the amount of character data. In this mobile phone, when the font size is small and the amount of character data is large, the backlight lighting time is set long. Accordingly, it is possible to determine the time for turning on the LCD backlight in consideration of the character visibility and the amount of data to be displayed.

  The wireless telephone device of Patent Document 2 determines that the time for illuminating the backlight is longer than the first time when it is determined that the information reception mode for obtaining information from a server accessed via a wireless line is selected. Set to 2 hours. Thereby, it is possible to optimally control the backlight lighting time in accordance with the function selected by the user, thereby improving the operability and extending the battery life.

Japanese Patent No. 3908740 Japanese Patent No. 4024444

  However, in Patent Document 1 and Patent Document 2 described above, it is considered difficult to dynamically control the lighting time of the backlight according to the contents of image data such as a photograph. For example, when several people view image data such as a group photo that contains multiple people, it is necessary to change the electronic device by several people, etc. May turn off. Each time, the user needs to perform a key operation or a touch operation and turn on the backlight again.

  The present invention has been made in view of the above-described conventional circumstances, and dynamically controls the lighting time of the backlight according to the content of the image data, thereby improving the convenience of operation for the user. An object of the present invention is to provide an image display method and program.

  The present invention is the above-described image display device, comprising: a display unit that displays image data; and a backlight unit that lights the display unit for a predetermined period of time, the image data; and A storage unit for storing lighting time readjustment information for resetting the lighting time of the backlight unit to a time different from the predetermined time, an operation unit for selecting the stored image data, An image analysis unit that analyzes the selected image data, and a control unit that sets a lighting time of the backlight unit according to the lighting time readjustment information and the analysis result, the control unit, The backlight unit is lit for the set lighting time.

  In addition, the present invention is an image display method as described above, and an image display method in an image display device including a display unit that displays image data and a backlight unit that lights the display unit for a predetermined time. Analyzing the image data selected as the image displayed on the display unit; lighting time readjustment information for resetting the lighting time of the backlight unit to a time different from the predetermined time; and the selection And a step of setting a lighting time of the backlight unit in accordance with an analysis result of the set image data, and a step of lighting the set lighting time and the backlight unit.

  Further, the present invention is the above-described program as an image displayed on the display unit on a computer including a display unit that displays image data and a backlight unit that lights the display unit for a predetermined time. Analyzing the selected image data, depending on the lighting time readjustment information for resetting the lighting time of the backlight unit to a time different from the predetermined time, and the analysis result of the selected image data The step of setting the lighting time of the backlight unit and the step of lighting the set lighting time and the backlight unit are realized.

  According to the configuration described above, it is possible to dynamically control the lighting time of the backlight according to the content of the image data, and to improve the convenience of operation for the user.

  According to the present invention, it is possible to dynamically control the lighting time of the backlight according to the contents of the image data, and to improve the convenience of operation for the user.

1 is a block diagram illustrating a hardware configuration of an image display device according to a first embodiment. An explanatory diagram showing an example of image data management information in a table format An explanatory diagram showing an example of lighting time readjustment information in a table format Flowchart for explaining a first operation example of the image display apparatus according to the first embodiment. Flowchart for explaining a second operation example of the image display apparatus according to the first embodiment. Flowchart for explaining a third operation example of the image display apparatus according to the first embodiment. Flowchart for explaining a fourth operation example of the image display apparatus according to the first embodiment. Flowchart for explaining a fifth operation example of the image display apparatus according to the first embodiment.

  Hereinafter, embodiments of an image display device according to the present invention will be described with reference to the drawings. In each embodiment, the image display apparatus according to the present invention corresponds to a mobile phone, a smartphone, a PDA (personal digital assistant), a notebook PC (personal computer), a digital still camera, an electronic book terminal, or the like.

  The present invention can also be expressed as an image display device or a program for operating the image display device as a computer. Furthermore, the present invention can also be expressed as a method including processing (steps) executed by the image display apparatus. That is, the present invention can be expressed in any category of the apparatus, method, and program.

(Embodiment 1)
The configuration and operation of the image display apparatus 100 according to the first embodiment will be described with reference to FIGS.

  In the first embodiment, the image display device includes an LCD serving as a display unit that displays image data and an LCD backlight serving as a backlight unit that lights the display unit for a predetermined time. Hereinafter, this predetermined time is referred to as “initial lighting time”.

  In the first embodiment, the image display device analyzes the image data selected as an image displayed on the display unit and resets the lighting time of the backlight unit to a time different from the predetermined time. The lighting time of the backlight unit is determined based on the readjustment information and the analysis result. Further, the image display device turns on the backlight unit for the determined lighting time.

  FIG. 1 is a block diagram illustrating an example of a hardware configuration of the image display apparatus 100 according to the first embodiment. As shown in FIG. 1, the image display apparatus 100 includes an operation unit 111, a storage unit 112, a control unit 113, an image decoding unit 114, an image analysis unit 115, an LCD 116 as a display unit, and an LCD backlight 117 as a backlight unit. , ROM 118 and RAM 118 are included.

  The operation unit 111 is a user interface for a user to input an operation on the image display device 100, and outputs an operation signal corresponding to the operation content of the user to the control unit 113. For example, when the user selects specific image data from the plurality of image data stored in the storage unit 112 for display on the LCD 116, the operation unit 111 outputs an image selection signal corresponding to the user operation to the control unit 113. Output to.

  For example, when the image display device 100 is a mobile phone, the operation unit 111 can be configured with various keys such as a numeric keypad for inputting a telephone number and the like, a telephone key for performing on-hook or off-hook, and a function key. Further, the operation unit 111 may be configured by a touch panel or the like that is disposed on the LCD 116 and can accept an input operation with a user's finger or a stylus pen.

  The storage unit 112 is configured by a hard disk or a flash memory built in the image display device 100, and stores a plurality of image data and lighting time readjustment information (see FIG. 2). Note that the image data is taken by the image display device 100 when the image display device 100 is equipped with a camera function, or taken by another electronic device (for example, a digital still camera) and the image display device. It may be imported into 100.

  The image data stored in the storage unit 112 may be image data compressed in a predetermined compression format or uncompressed image data. Information indicating whether the image data is compressed is preferably stored in the header area of the image data, or the decoding method can be determined by the extension of the file name.

  When the image data is read from the storage unit 112, the control unit 113 detects whether the image data is compressed from the header area of the image data. When determining that the image data is compressed, the control unit 113 outputs the image data to the image decoding unit 114. When the control unit 113 determines that the image data is not compressed, the control unit 113 outputs the image data to the image analysis unit 115.

  The header area of the image data stored in the storage unit 112 includes information indicating that the image data is a user's favorite, and the name of the subject person when the subject is a person. It is preferable. A method for including the subject person name in the header area of the image data taken by the image display device 100 or other electronic device having a photographing unit for photographing the subject is already known, and is disclosed in, for example, Japanese Patent No. 4470848. Is applicable.

  Further, the storage unit 112 stores image data management information (FIG. 2) indicating whether or not the image data is a user favorite for each stored image data.

  FIG. 2 is an explanatory diagram showing an example of the image data management information 130 in a table format. The image data management information 130 is configured to include items of an image data ID for identifying the image data and a user's favorite degree with respect to the image data.

  In the image data management information 130 of FIG. 2, the user's favorite degree for the image data with the image data ID “001” is “1”. Similarly, the user's favorite degree for the image data with the image data ID “002” is “3”. Similarly, the user's favorite degree for the image data with the image data ID “003” is “2”. Similarly, the user's favorite degree for the image data with the image data ID “004” is “0”.

  FIG. 3 is an explanatory diagram showing an example of the lighting time resetting information 140 in a table format. The lighting time reset information 140 is information for resetting the lighting time of the LCD backlight 117 to a time different from the initial lighting time according to each parameter. The parameters include, for example, the number of face detections, the subject person name, the blurring degree, and the favorite degree, but are not limited thereto.

  In the lighting time reset information 140 of FIG. 3, when the number of detected parameters “face” is “0”, the lighting time of the LCD backlight 117 is maintained at “initial lighting time” [seconds]. Similarly, when the number of detected parameters “face” is “1”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 3” [seconds]. Similarly, when the number of detected parameters “face” is “2”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 6” [seconds]. Similarly, when the number of detected parameters “face” is “3”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 9” [seconds].

  In the lighting time reset information 140 of FIG. 3, when the parameter “subject person name” is “0”, the lighting time of the LCD backlight 117 is maintained at “initial lighting time” [seconds]. Similarly, when the parameter “subject person name” is “1”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 3” [seconds]. Similarly, when the parameter “subject person name” is “2”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 8” [seconds]. Similarly, when the parameter “subject person name” is “3”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 12” [seconds].

  In the lighting time reset information 140 of FIG. 3, when the parameter “favorite degree” is “0”, the lighting time of the LCD backlight 117 is maintained at “initial lighting time” [seconds]. Similarly, when the parameter “favorite degree” is “1”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 2” [seconds]. Similarly, when the parameter “favorite degree” is “2”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 4” [seconds]. Similarly, when the parameter “favorite level” is “3”, the lighting time of the LCD backlight 117 is reset to “initial lighting time + 6” [seconds].

  In the lighting time resetting information 140 of FIG. 3, when the parameter “degree of blurring” is “0”, the lighting time of the LCD backlight 117 is maintained at “initial lighting time” [seconds]. Similarly, when the parameter “blurring degree” is “1”, the lighting time of the LCD backlight 117 is reset to “initial lighting time−1” [seconds]. Similarly, when the parameter “blurring degree” is “2”, the lighting time of the LCD backlight 117 is reset to “initial lighting time−2” [seconds]. Similarly, when the parameter “blurring degree” is “3”, the lighting time of the LCD backlight 117 is reset to “initial lighting time−3” [seconds].

  In the case where the parameter “blurring degree” is “1 or more”, the lighting time resetting information 140 in FIG. 3 describes an example in which a predetermined time is subtracted from the initial lighting time, but the initial lighting time is maintained. May be.

  Furthermore, the storage unit 112 stores lighting time setting availability information for validating or invalidating the lighting time setting of the LCD backlight 117 based on the lighting time readjustment information 140 and the analysis result of the image analysis unit 115. Yes. For example, the lighting time of the LCD backlight 117 is set to be valid or invalid according to an operation signal from the operation unit 111 according to a user operation.

  The control unit 113 is configured by a CPU (central processing unit) or the like built in the image display device 100 and controls the operation of each unit of the image display device 100. For example, the control unit 113 reads out image data corresponding to the image selection signal from the storage unit 112 in accordance with the image selection signal output from the operation unit 111.

  Further, the control unit 113 determines the lighting time of the LCD backlight 117 based on the lighting time readjustment information 140 (see FIG. 3) and the analysis result of the image analysis unit 115 described later, and the determined lighting time is displayed on the LCD. The lighting time of the backlight 117 is reset.

  The control unit 113 stores information or data in the RAM 119 or the storage unit 112 during various controls, or performs information processing using the stored information or data. In addition, the control unit 113 includes an internal clock, and after the set lighting time has elapsed, the LCD backlight 117 is directly turned off or slightly turned off after the set lighting time has elapsed.

  The internal clock is one of functions of an OS (Operating System) that causes the image display apparatus 100 to operate as a computer, for example, and is a system clock (clock) of the image display apparatus 100.

  The image decoding unit 114 decodes (decompresses) the image data output from the control unit 113 and outputs the decoded image data to the control unit 113.

  The image analysis unit 115 performs image analysis on the decoded image data output from the control unit 113 or uncompressed image data. The image analysis unit 115 outputs the image analysis result to the control unit 113. The operation content of the image analysis unit 115 in the present embodiment will be specifically described.

  The image analysis unit 115 detects the face of the subject person from the image data, or detects a predetermined amount of blurring or blurring in the image data. The image analysis unit 115 outputs, to the control unit 113, the detected number of faces of the subject person or the degree of blurring or blurring as a parameter of the image analysis result.

  Note that a method for detecting the face of a subject person from image data is already known. For example, a method disclosed in Japanese Patent No. 4043973 or Japanese Patent No. 4329398 can be applied.

  Furthermore, a method for detecting a predetermined blurring degree or blurring degree in image data is already known, and for example, a method disclosed in JP-A-2005-332381 can be applied. Note that it is preferable that the degree of blurring or the degree of blurring in the degree of blurring or blurring is expressed in advance by the operation of the image analysis unit 115, such as 1, 2, 3,. .

  The image analysis unit 115 detects the number of person names (subject person names) from the image data based on the decoded image data output from the control unit 113 or the header area of the uncompressed image data. . The image analysis unit 115 outputs the number of detected subject person names to the control unit 113 as a parameter of the image analysis result.

  The image analysis unit 115 performs processing on image data based on the decoded image data output from the control unit 113 or the header area of uncompressed image data, or the image data management information 130 stored in the storage unit 112. Detect the user's favorite degree. The image analysis unit 115 outputs the detected favorite degree to the control unit 113 as a parameter of the image analysis result.

  The LCD 116 displays the image data output from the control unit 113 according to the image selection signal output from the operation unit 111 as a display unit of the image display device 100.

  The LCD backlight 117 is located behind the LCD 116 with respect to the user of the image display device 100 under the control of the control unit 113 based on an operation signal output by the operation unit 111 in response to an operation such as a key press by the user. The LCD 116 is turned on.

  The LCD backlight 117 lights the LCD 116 for a preset initial lighting time in accordance with a user operation such as key depression. Also, the LCD backlight 117 lights the LCD 116 for a preset initial lighting time or a reset lighting time determined and set by the control unit 113 in accordance with the user's image display operation.

  The ROM 118 stores programs in which operations of the control unit 113, the image decoding unit 114, and the image analysis unit 115 in the image display device 100 are defined in advance. Note that each unit of the control unit 113, the image decoding unit 114, and the image analysis unit 115 can be configured by hardware or software. In particular, when each of these units is configured by software, the CPU built in the image display apparatus 100 reads out a program in which the operation of each unit is defined in advance from the ROM 118, so that each unit can operate. .

  The RAM 119 operates as a work memory in each operation of the control unit 113, the image decoding unit 114, and the image analysis unit 115.

  Next, the operation of the image display apparatus 100 will be described with reference to FIGS. FIG. 4 is a flowchart for explaining a first operation example of the image display apparatus 100 according to the first embodiment. FIG. 5 is a flowchart for explaining a second operation example of the image display apparatus 100 according to the first embodiment. FIG. 6 is a flowchart for explaining a third operation example of the image display apparatus 100 according to the first embodiment. FIG. 7 is a flowchart for explaining a fourth operation example of the image display apparatus 100 according to the first embodiment. FIG. 8 is a flowchart for explaining a fifth operation example of the image display apparatus 100 according to the first embodiment.

(First operation example)
In FIG. 4, in the image display device 100, the image analysis unit 115 detects whether there is a human face from the image data. Further, the control unit 113 determines the lighting time of the LCD backlight 117 based on the detection result (analysis result).

  In FIG. 4, the control unit 113 sets (initializes) the lighting time of the LCD backlight 117 to the initial lighting time (S101). If the lighting time of the LCD backlight 117 is already set to the initial lighting time before step S101, the operation of step S101 may be omitted.

  After step S101, when the user selects specific image data from the plurality of image data stored in the storage unit 112 for display on the LCD 116 (S102, YES), the operation unit 111 responds to the user's operation. The selected image selection signal is output to the control unit 113.

  The control unit 113 reads image data corresponding to the image selection signal from the storage unit 112 in accordance with the image selection signal output from the operation unit 111 (S103). When image data is read from the storage unit 112, it is detected from the header area of the image data whether the image data is compressed. When determining that the image data is compressed, the control unit 113 outputs the image data to the image decoding unit 114.

  4 to 8, it is assumed that the image data read in step S103 is compressed. However, as described above, the image data read in step S103 may not be compressed.

  The image decoding unit 114 decodes (decompresses) the image data output from the control unit 113 (S104), and outputs the decoded image data to the control unit 113.

  The image analysis unit 115 detects the face of the subject person from the decoded image data output from the control unit 113 (S105). The image analysis unit 115 outputs the number of faces of the subject person detected in step S105 to the control unit 113 as a parameter of the image analysis result.

  When the detected number of faces of the subject person is one or more (S106, YES), the control unit 113 reads the lighting time readjustment information 140 of FIG. The control unit 113 determines the lighting time of the LCD backlight 117 based on the lighting time readjustment information 140 and the image analysis result.

  For example, when the initial lighting time is 10 [seconds] and two faces of the subject person are detected as an image analysis result, the control unit 113 sets the lighting time of the LCD backlight 117 to 10 [seconds] +6 [Seconds] (see FIG. 3) = 16 [seconds].

  Furthermore, the control unit 113 resets the lighting time of the LCD backlight 117 from the initial lighting time set in step S101 to the lighting time determined according to the image analysis result (S107). For example, the control unit 113 resets the lighting time of the LCD backlight 117 to 16 [seconds].

  When the face of the subject person is not detected at all (S106, NO), the control unit 113 maintains the initial lighting time set in step S101 as the lighting time of the LCD backlight 117.

  Thereafter, the control unit 113 lights the LCD backlight 117 for the initial lighting time set in step S101 or the lighting time reset in step S107 (S108). As a result, the flowchart of FIG. 4 ends.

(Second operation example)
In FIG. 5, in the image display device 100, the image analysis unit 115 detects whether or not there is a subject person name (subject person name) in the image data from the header area of the image data. Further, the control unit 113 determines the lighting time of the LCD backlight 117 based on the detection result (analysis result).

  In the second operation example, contents different from the first operation example will be described.

  In FIG. 5, the image analysis unit 115 detects the number of person names (subject person names) of the subject person from the image data based on the header area of the image data output from the control unit 113 in step S103 (S105A). . The image analysis unit 115 outputs the number of subject person names detected in step S105A to the control unit 113 as a parameter of the image analysis result.

  In step S105A in FIG. 5, the image analysis unit 115 determines the subject person from the image data based on the header area of the decoded image data output from the control unit 113, as in step S105 in FIG. The number of person names (subject person names) may be detected.

  When the number of detected subject person names is one or more (S106A, YES), the control unit 113 reads the lighting time readjustment information 140 of FIG. The control unit 113 determines the lighting time of the LCD backlight 117 based on the lighting time readjustment information 140 and the image analysis result.

  For example, when the initial lighting time is 10 [seconds] and the number of subject person names is detected as two as an image analysis result, the control unit 113 sets the lighting time of the LCD backlight 117 to 10 [seconds]. It is determined that +8 [seconds] (see FIG. 3) = 18 [seconds].

  Furthermore, the control unit 113 resets the lighting time of the LCD backlight 117 from the initial lighting time set in step S101 to the lighting time determined according to the image analysis result (S107). For example, the control unit 113 resets the lighting time of the LCD backlight 117 to 18 [seconds].

  When no subject person name is detected (S106A, NO), the control unit 113 maintains the initial lighting time set in step S101 to the lighting time of the LCD backlight 117. The subsequent processing is the same as in FIG. Thereby, the flowchart of FIG. 5 is completed.

(Third operation example)
In FIG. 6, in the image display device 100, the image analysis unit 115 detects the user's favorite level for the image data from the header area of the image data or the image data management information 130 stored in the storage unit 112. . Further, the control unit 113 determines the lighting time of the LCD backlight 117 based on the detection result (analysis result).

  In the third operation example, contents different from the first operation example will be described.

  In FIG. 6, the image analysis unit 115 selects the user's favorite for image data based on the header area of the image data output from the control unit 113 in step S103 or the image data management information 130 stored in the storage unit 112. The degree is detected (S105B). The image analysis unit 115 outputs the favorite degree detected in step S105B to the control unit 113 as a parameter of the image analysis result.

  In step S105B of FIG. 6, the image analysis unit 115 selects the user's favorite for the image data based on the header area of the decoded image data output from the control unit 113, as in step S105 of FIG. The degree may be detected.

  When the detected favorite degree is 1 or more (S106B, YES), the control unit 113 reads the lighting time readjustment information 140 of FIG. The control unit 113 determines the lighting time of the LCD backlight 117 based on the lighting time readjustment information 140 and the image analysis result.

  For example, when the initial lighting time is 10 [seconds] and the favorite level is detected as 2 as the image analysis result, the control unit 113 sets the lighting time of the LCD backlight 117 to 10 [seconds] +4 [seconds]. ] (See FIG. 3) = 14 [seconds].

  Furthermore, the control unit 113 resets the lighting time of the LCD backlight 117 from the initial lighting time set in step S101 to the lighting time determined according to the image analysis result (S107). For example, the control unit 113 resets the lighting time of the LCD backlight 117 to 14 [seconds].

  When the favorite degree is less than 1, that is, 0 (zero) (S106B, NO), the control unit 113 maintains the initial lighting time set in step S101 as the lighting time of the LCD backlight 117. The subsequent processing is the same as in FIG. Thereby, the flowchart of FIG. 6 is completed.

(Fourth operation example)
In FIG. 7, in the image display device 100, the image analysis unit 115 detects whether there is a predetermined amount of blurring or blurring in the image data. Further, the control unit 113 determines the lighting time of the LCD backlight 117 based on the detection result (analysis result).

  In the fourth operation example, contents different from the first operation example will be described.

  In FIG. 7, the image analysis unit 115 detects whether or not the decoded image data output from the control unit 113 has a predetermined amount of blurring or blurring (S105C). The image analysis unit 115 outputs the degree of blur or the degree of blur detected in step S105C to the control unit 113 as a parameter of the image analysis result.

  When the detected blur degree or blur degree is one or more (S106C, YES), the control unit 113 reads the lighting time readjustment information 140 of FIG. The control unit 113 determines the lighting time of the LCD backlight 117 based on the lighting time readjustment information 140 and the image analysis result.

  For example, when the initial lighting time is 10 [seconds] and the blurring degree or blurring degree is detected as 2 as an image analysis result, the control unit 113 sets the lighting time of the LCD backlight 117 to 10 [seconds]. -2 [seconds] (see FIG. 3) = 8 [seconds]. Note that the lighting time readjustment information 140 in FIG. 3 is set to subtract several seconds from the initial lighting time when the degree of blurring or blurring is 1 or more. However, as described above, the initial lighting time may be set to be maintained instead of being subtracted from the initial lighting time.

  Furthermore, the control unit 113 resets the lighting time of the LCD backlight 117 from the initial lighting time set in step S101 to the lighting time determined according to the image analysis result (S107). For example, the control unit 113 resets the lighting time of the LCD backlight 117 to 8 [seconds].

  When the degree of blur or blur is not detected at all (S106C, NO), the control unit 113 maintains the initial lighting time set in step S101 as the lighting time of the LCD backlight 117. The subsequent processing is the same as in FIG. As a result, the flowchart of FIG. 7 ends.

(Fifth operation example)
In FIG. 8, in the image display apparatus 100, the image analysis unit 115 performs the image analysis described in all of the first to fourth operation examples. Furthermore, the control unit 113 determines the lighting time of the LCD backlight 117 based on each detection result (analysis result).

  In the fifth operation example, contents different from the first operation example will be described.

  In FIG. 5, the image analysis unit 115 detects the number of person names (subject person names) of the subject person from the image data based on the header area of the image data output from the control unit 113 in step S103 (S105— D1). Further, the image analysis unit 115 determines the user's favorite degree with respect to the image data based on the header area of the image data output from the control unit 113 in step S103 or the image data management information 130 stored in the storage unit 112. It detects (S105-D1). The image analysis unit 115 outputs each parameter of each image analysis result detected in step S105-D1 to the control unit 113.

  Note that in step S105-D1 in FIG. 8, the image analysis unit 115, as in step S105 in FIG. 4, is based on the header area of the decoded image data output from the control unit 113. The number of names (subject person names) and the user's favorite degree with respect to the image data may be detected.

  After acquiring each parameter of each image analysis result detected in step S105-D1, the control unit 113 determines that the image data is compressed in step S103, and converts the image data into the image decoding unit 114. Output to.

  The image decoding unit 114 decodes the image data output from the control unit 113 (S104), and outputs the decoded image data to the control unit 113. If the control unit 113 determines in step S103 that the image data is not compressed, the process in step S104 may be omitted.

  The image analysis unit 115 detects the face of the subject person from the decoded image data output from the control unit 113 (S105-D2). Further, the image analysis unit 115 detects whether or not the decoded image data output from the control unit 113 has a predetermined amount of blurring or blurring (S105-D2).

  The image analysis unit 115 outputs each parameter of each image analysis result detected in step S105-D2 to the control unit 113.

  It is assumed that one or more conditions among the image analysis results are met, that is, each image analysis result has one or more parameters (S106-D1, YES). In this case, the control unit 113 further determines whether or not a plurality of conditions are met, that is, whether or not each parameter of the plurality of image analysis results has one or more (S106-D2).

  When it is determined that a plurality of conditions are met (S106-D2, YES), the control unit 113 reads the lighting time readjustment information 140 of FIG. Further, the control unit 113 sets the longest lighting time of the LCD backlight 117 after the readjustment determined based on the lighting time readjustment information 140 based on the parameters detected in steps S105-D1 and S105-D2. Is determined as the lighting time of the LCD backlight 117.

  Note that the control unit 113 may determine the shortest lighting time as the lighting time of the LCD backlight 117 instead of the longest lighting time.

  For example, when the initial lighting time is 10 [seconds], and the number of detected faces is detected as 1 as the image analysis result and the favorite degree is 3, the control unit 113 sets the lighting time of the LCD backlight 117 as follows: It is determined that 10 [seconds] +6 [seconds] = 16 [seconds]. In the lighting time readjustment information 140, when the number of detected faces is 1, it is +3 [seconds] from the initial lighting time, but when the favorite degree is 3, it is +6 [seconds] from the initial lighting time. The controller 113 determines 16 [seconds], which is the longest lighting time among the lighting times of the LCD backlight 117 after readjustment from the initial lighting time, as the lighting time of the LCD backlight 117.

  Further, the control unit 113 resets the lighting time of the LCD backlight 117 from the initial lighting time set in step S101 to the lighting time determined according to the image analysis result (S107-D2). For example, the control unit 113 resets the lighting time of the LCD backlight 117 to 16 [seconds].

  When it is determined that the plurality of conditions do not match (S106-D2, NO), the control unit 113 reads the lighting time readjustment information 140 of FIG. Further, the control unit 113 determines the lighting time of the LCD backlight 117 based on one matching condition, that is, the image analysis result parameter that is 1 or more and the lighting time readjustment information 140.

  For example, when the initial lighting time is 10 [seconds] and the favorite level is detected as 2 as the image analysis result, the control unit 113 sets the lighting time of the LCD backlight 117 to 10 [seconds] +4 [seconds]. ] (See FIG. 3) = 14 [seconds].

  Further, the control unit 113 resets the lighting time of the LCD backlight 117 from the initial lighting time set in step S101 to the lighting time determined according to the image analysis result (S107-D1). For example, the control unit 113 resets the lighting time of the LCD backlight 117 to 14 [seconds].

  When none of the conditions is met, that is, when each parameter of the entire image analysis result is not 1 or more (S106-D1, NO), the control unit 113 sets the initial lighting time set in step S101. Is maintained during the lighting time of the LCD backlight 117. The subsequent processing is the same as in FIG. Thereby, the flowchart of FIG. 8 ends.

  As described above, the image display apparatus 100 performs a predetermined image analysis on the image data selected (operated) by the user as a display target, and the LCD display is based on the parameters of the image analysis result and the lighting time readjustment information. The lighting time of the light 117 is determined. The image display device 100 resets the determined lighting time as the lighting time of the LCD backlight 117.

  Therefore, according to the image display apparatus 100, the lighting time of the backlight is dynamically controlled according to the content of the image data, and the convenience of operation for the user is improved when the image data is browsed by a plurality of people. be able to.

  That is, according to the image display device 100, the lighting time of the LCD backlight 117 can be shortened or lengthened depending on the content of the image, and the convenience of operation for the user can be improved while performing power saving control. For example, the power saving control can be realized by effectively setting the function of turning off and turning off the LCD backlight 117 in a certain period of time. As a result, the LCD backlight 117 is turned off and the LCD backlight 117 is turned on again by the user's key operation, but the operation frequency is reduced.

  While various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is obvious for those skilled in the art that variations and modifications of various embodiments, and combinations of various embodiments can be conceived within the scope of the claims. Of course, it is understood that it belongs to the technical scope of the present invention.

  In the above-described embodiment, when other image data is selected by the operation unit 111, the control unit 113 sets the LCD backlight 117 that is set based on the lighting time readjustment information 140 and the image analysis result. The lighting time may be initialized to the initial lighting time.

  In the above-described fifth operation example, when a predetermined blurring degree or blurring degree is detected among the parameters detected in steps S105-D1 and S105-D2, the control unit detects the parameter. The lighting time of the LCD backlight 117 may be determined based on the degree of blur or the degree of blur. In this case, for example, when the initial lighting time is 10 [seconds] and the number of detected faces is 1, the favorite degree is 3, and the blur degree is 2 as an image analysis result, the control unit 113 The lighting time of the LCD backlight 117 is determined as 10 [seconds] −2 [seconds] = 8 [seconds].

  INDUSTRIAL APPLICABILITY The present invention is useful as an image display device, an image display method, and a program that can dynamically control the backlight lighting time according to the content of image data and improve the convenience of operation for the user. .

100 Mobile Phone 111 Operation Unit 112 Storage Unit 113 Control Unit 114 Image Decoding Unit 115 Image Analysis Unit 116 LCD
117 LCD backlight 118 ROM
119 RAM
130 Image data management information 140 Lighting time readjustment information

Claims (16)

An image display device comprising: a display unit that displays image data; and a backlight unit that lights the display unit for a predetermined time;
A storage unit that stores lighting time readjustment information for resetting the image data and the lighting time of the backlight unit to a time different from the predetermined time;
An operation unit for selecting the stored image data;
An image analysis unit for analyzing the selected image data;
Based on the lighting time readjustment information and the analysis result, a control unit that sets a lighting time of the backlight unit, and
The control unit is an image display device that lights the backlight unit for the set lighting time. The image display device according to claim 1,
The image analysis unit detects a face of a subject person from the selected image data;
The said control part is an image display apparatus which determines the lighting time of the said backlight part based on the said lighting time readjustment information and the number of the said to-be-photographed person's faces. The image display device according to claim 2,
The control unit, when the face of the subject person is not detected in the selected image data, determines the lighting time of the backlight unit as the predetermined time. The image display device according to claim 1,
The image data includes person name information of a subject person shown in the image data in a header area,
The image analysis unit detects the person name information from the header area of the selected image data,
The said control part is an image display apparatus which determines the lighting time of the said backlight part based on the number of the said lighting time readjustment information and the detected said person name information. The image display device according to claim 4,
The control unit, when the person name information is not detected from the header area of the selected image data, determines the lighting time of the backlight unit as the predetermined time. The image display device according to claim 1,
The storage unit stores image data management information representing a user's favorite degree with respect to the image data,
The image analysis unit detects a user's favorite degree with respect to the selected image data based on the image data management information,
The said control part is an image display apparatus which determines the lighting time of the said backlight part based on the said lighting time readjustment information and the detected said favorite degree. The image display device according to claim 6,
The control unit is an image display device that determines a lighting time of the backlight unit as the predetermined time when a user's favorite degree with respect to the selected image data is zero. The image display device according to claim 1,
The image analysis unit detects a degree of blurring or blurring of the selected image data,
The said control part is an image display apparatus which determines the lighting time of the said backlight part based on the said lighting time readjustment information and the detected said blurring degree or blurring degree. The image display device according to claim 8,
The control unit is an image display device that determines a lighting time of the backlight unit as the predetermined time when the blur degree and the blur degree are not detected in the selected image data. The image display device according to claim 1,
The image data includes person name information of a person shown in the image data in a header area,
The storage unit stores image data management information representing a user's favorite degree with respect to the image data,
The image analysis unit is configured to determine a person's face and the degree of blurring or blurring from the selected image data, the person name information from the header area, and a user favorite degree with respect to the selected image data. , Detect each
The control unit determines the longest lighting time among the lighting times of the backlight unit after readjustment determined based on the lighting time readjustment information based on the detected parameters. An image display device that is determined as time. The image display device according to claim 10,
The said control part is an image display apparatus which determines the lighting time of the said backlight part based on the said blurring degree or the said blur degree, when the said blurring degree or the blurring degree is detected among the detected parameters. The image display device according to claim 1,
The storage unit stores lighting time setting availability information for validating or invalidating the lighting time setting of the backlight unit according to the lighting time readjustment information and the analysis result,
The said control part is an image display apparatus which sets the lighting time of the said backlight part according to the said lighting time setting availability information. The image display device according to claim 1,
The control unit initializes a lighting time set based on the lighting time readjustment information and the analysis result to the predetermined time when other image data is selected by the operation unit. . The image display device according to claim 1,
The storage unit stores image data compressed in a predetermined compression format,
An image display device further comprising: an image decoding unit that decodes the compressed image data selected by the operation unit. An image display method in an image display device, comprising: a display unit that displays image data; and a backlight unit that lights the display unit for a predetermined time;
Analyzing image data selected as an image to be displayed on the display unit;
The lighting time of the backlight unit is determined according to lighting time readjustment information for resetting the lighting time of the backlight unit to a time different from the predetermined time and the analysis result of the selected image data. Steps,
An image display method comprising: determining the lighting time; and turning on the backlight unit. In a computer including a display unit for displaying image data and a backlight unit for lighting the display unit for a predetermined time,
Analyzing image data selected as an image to be displayed on the display unit;
The lighting time of the backlight unit is determined according to lighting time readjustment information for resetting the lighting time of the backlight unit to a time different from the predetermined time and the analysis result of the selected image data. Steps,
A program for realizing the determined lighting time and the step of lighting the backlight unit.

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