JP2007121783A - Image display apparatus and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus and an image display method therefor achieving suppression of the delay of display start and retainment of the smoothness of a moving image when displaying the moving image by successively displaying a series of still pictures. <P>SOLUTION: When starting the display of a moving image for wallpaper, the image data of a head still picture corresponding to image data prestored in a wallpaper image storing area 1101 in a storage part 110 is displayed on a display part 107, and then the image data of the second still picture to be displayed next to the head still picture is decoded by a decoding part 108. After the lapse of prescribed time 'T2' from the start of display of the head still image, the display image of the display part 107 is switched from the head still picture to the second still picture. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image display device that displays a moving image by sequentially displaying a series of still images and an image display method thereof, such as a portable terminal that displays a moving image as an image for wallpaper in a standby mode. The present invention relates to an image display device.

  In recent years, portable electronic devices have become more and more sophisticated. For example, mobile phones and portable game machines that can display still images and moving images are widely used. In addition, some of such electronic devices can reproduce image files in various formats such as JPEG (joint photographic experts group) and GIF (graphic interchange format). The selected image file can be transferred from the outside and displayed as wallpaper in the standby mode.

  Usually, an image file handled by a mobile phone is compressed and encoded from the viewpoint of saving memory capacity, and it is necessary to perform a decoding process in order to reproduce it. For this reason, when a new image file is reproduced and displayed, for example, when switching the image for wallpaper, the display of the image is delayed due to the time required for decoding the image file, and the user is dissatisfied. The inconvenience arises.

  As a method for solving such inconvenience, there is a method of storing image data in a memory in advance. In this method, when a new image file is reproduced, the decoded image data is stored in the memory, and when this image file is reproduced next, the image data in the memory is used. Thereby, since an image can be displayed without performing a decoding process, a delay can be suppressed.

Further, as a method for suppressing a delay in displaying a moving image, there is a method described in Patent Document 1. In this method, the first image of the moving image is decoded in advance and stored in the memory, and when it is requested to reproduce the moving image, the first image stored in the memory is displayed first. Thus, since the head image is displayed immediately when the reproduction of the moving image is requested, the user's dissatisfaction can be reduced as compared with the case where no image is displayed until the reproduction is started after the reproduction is requested.
JP 2005-151484 A

  By the way, the GIF format image file includes information for designating the display time of each still image constituting the animation in units of 10 msec. When reproducing the animation, the switching of the still image is performed according to the display time information. Need to do.

  However, in the method of Patent Document 1, since the time from the start of the display of the first image to the start of the display of the next image is not taken into consideration, the display time of the first image is compared with the time specified in advance. There is an inconvenience that it shifts greatly.

For example, the time from when a GIF file playback request is received until the decoding process is completed is 'TA', the display time of each still image specified by the information in the GIF file is 'TB', and the display of the top image Let time be 'TY'. Since “TB” is unknown until the decryption process of the GIF file is executed, if the second still image is displayed after the time “TB” has elapsed since the decryption process was completed, The display time 'TY' of the first image is
TY = TA + TB;
become. In this case, the display time “TY” of the top image becomes longer by the decoding processing time “TA” than the designated display time “TB”.

On the other hand, when the second still image is displayed immediately after the decoding process is completed, the display time 'TY' of the first image is
TY = TA;
It becomes. In this case, if the designated display time “TB” is very long compared to the decoding processing time “TA”, the display time “TY” of the top image is shorter than that of the other still images. It will be unnaturally shortened.

  As described above, in the method of Patent Document 1, the display time (TY) of the first still image changes under the influence of the time (TA) of the decoding process, and from the time (TB) specified in the image file. Deviation occurs. For this reason, the smoothness of the moving image is impaired, and there is a disadvantage that the user feels uncomfortable.

  The present invention has been made in view of such circumstances, and an object of the present invention is to suppress a delay in the start of display and smooth a moving image when displaying a moving image by sequentially displaying a series of still images. It is an object of the present invention to provide an image display device and an image display method that can be reproduced.

  A first aspect of the present invention relates to an image display device that sequentially displays a series of still images. The image display device includes a first storage unit that stores encoded image data of a series of still images, a decoding unit that decodes the encoded image data, and a head in the series of still images. Second storage means for storing the decoded image data of the still image, display means for displaying a still image corresponding to the image data decoded by the decoding means, and the series of still image images When receiving a display start instruction, the head still image corresponding to the image data stored in the second storage means is displayed on the display means, and at least a second to be displayed next to the head still image. The image data of the still image is read from the first storage means, decoded by the decoding means, and displayed on the display means when the first time has elapsed since the start of the display of the head still image. Image From a still image and a control means for switching said second still image.

  The control means performs a second period from when the display means starts displaying the first still picture until when the decoding means finishes decoding the image data of the second still picture to be displayed next. When the second time is shorter than the first time, when the first time has elapsed since the start of the display of the first still image, the time is displayed on the display means. The image may be switched from the first still image to the second still image.

  In addition, the control unit may start from when the display unit starts displaying the first still image until when the decoding unit finishes decoding the image data of the second still image to be displayed next. A second time is obtained, a difference between the first time and the second time is calculated as a third time, and when the third time has elapsed from the end of the decoding, the display image Switching may be performed.

  Further, the control means may switch the display image immediately after the decoding is completed when the second time is longer than the first time.

  The image display device according to the first aspect may include time data generating means for generating time data indicating time. In this case, the control means includes the time data acquired from the time data generating means when the display means starts displaying the first still picture, and the image data of the still picture to be displayed next by the decoding means. The second time may be acquired on the basis of the time data acquired from the time data generating means when the decoding of is completed.

  The display means may switch images to be displayed at a predetermined interval when sequentially displaying still images corresponding to the image data decoded by the decoding means. In this case, the first time may be set to be substantially the same as the predetermined interval.

  A second aspect of the present invention relates to an image display method for sequentially displaying a series of still images. In this image display method, encoded image data of a series of still images is stored in a first storage unit, and encoded image data of a leading still image in the series of still images is decoded to obtain a second image data. The first still image based on the decoded image data stored in the second storage means is displayed on the display means upon receiving an instruction to start displaying the series of still images. And decoding the encoded image data of the second still image to be displayed at least next to the first still image stored in the first storage means, and starting the display of the first still image When the first time has elapsed, the image displayed on the display means is switched from the first still image to the second still image.

  When the first time has elapsed from the start of the display of the first still image and the image data is being decoded, the display image is switched immediately after the decoding process is completed. You can go.

  When the still images corresponding to the decoded image data are sequentially displayed, they are displayed with a predetermined interval, and the first time may be set to be substantially the same as the predetermined interval. .

  According to the present invention, it is possible to suppress the delay of the display start by displaying the first still image based on the image data decoded in advance. Also, when the first still image is displayed, the next still image is decoded, and after a predetermined time has elapsed from the start of the display, the next still image is switched to allow the first still image to be displayed. The display time can be set to a predetermined time.

<First Embodiment>
FIG. 1 is a diagram illustrating an example of a configuration of an image display apparatus according to the first embodiment of the present invention, and illustrates an example of an image display apparatus having a function as a mobile phone.
1 includes an antenna 101, a communication unit 102, a key input unit 103, an audio processing unit 104, a speaker 105, a microphone 106, a display unit 107, a decoding unit 108, and a storage. Units 109, 110, a time data generation unit 111, and a control unit 115.

The storage unit 109 is an embodiment of the first storage unit.
The decryption unit 108 is an embodiment of decryption means.
The storage unit 110 is an embodiment of the second storage unit.
The display unit 107 is an embodiment of display means.
The time data generator 111 is an embodiment of a time data generator.
The control unit 115 is an embodiment of the control means.

  The communication unit 102 performs wireless communication with a base station (not shown) connected to the communication network. For example, the communication unit 102 performs predetermined modulation processing on the transmission data supplied from the control unit 115 to convert it into a radio signal, and transmits it from the antenna 101. Further, the radio signal from the base station received by the antenna 101 is subjected to a predetermined demodulation process to be converted into reception data and output to the control unit 115.

  The key input unit 103 has keys having various functions such as numeric keys, character keys, arrow keys, and enter keys, and corresponds to the operation contents when these keys are operated by the user. Is generated and input to the control unit 115 as a user instruction.

  The audio processing unit 104 processes an audio signal output from the speaker 105 and an audio signal input from the microphone 106. That is, the audio signal input from the microphone 106 is subjected to signal processing such as amplification, analog-digital conversion, encoding, and the like, converted into digital audio data, and output to the control unit 115. In addition, the audio data supplied from the control unit 115 is subjected to signal processing such as decoding, digital-analog conversion, amplification, and the like, converted into an analog audio signal, and output to the speaker 105.

The display unit 107 is configured using a display device such as a liquid crystal display panel or an organic EL panel, for example, and displays an image corresponding to the image data supplied from the control unit 115. For example, various information such as the telephone number of the callee at the time of outgoing call, the telephone number of the callee at the time of incoming call, the contents of the received mail and the outgoing mail, the date, time, and the remaining battery level are displayed.
In addition, when the image data decoded by the decoding unit 108 is supplied from the control unit 115, the display unit 107 displays a moving image or a still image corresponding to the image data. For example, a moving image or still image for wallpaper is displayed in the standby mode.

  The storage unit 109 stores various data used in the process of the control unit 115. For example, the computer program code of the control unit 115, an address book for managing telephone numbers and e-mail addresses, audio files for playing ringtones and alarm sounds, image files for wallpaper in standby mode, various setting data Remember. In the example of FIG. 1, an image file FIL for wallpaper is shown as one of such data. The image file FIL is a moving image file such as a GIF format.

  For example, the storage unit 109 is configured by a nonvolatile storage device so that data can be retained even after the power is turned off. Specifically, it is configured by a nonvolatile semiconductor memory such as a flash memory, a hard disk device, an optical disk device, or the like.

The decoding unit 108 performs a decoding process for reproducing an image from an image file (image file FIL in the example of FIG. 1) stored in the storage unit 109. That is, a predetermined decoding process is performed on the encoded image data included in the image file FIL to generate a series of still image data (for example, bitmap-format image data).
The decoding unit 108 has, for example, a memory therein, and temporarily stores the decoded still image data in the memory.

  The storage unit 110 temporarily stores computer program code loaded from the storage unit 109, data used in the process of the program, bitmap data used for image display in the display unit 107, and the like. Store the various data you need.

  In the example of FIG. 1, the storage unit 110 includes a wallpaper image storage area 1101 and a heap area 1102.

  The wallpaper image storage area 1101 is a dedicated storage area for storing the decoded image data for wallpaper. In this storage area, the decoded image of the first image of the moving image reproduced by the image file FIL is stored. Data (for example, image data in bitmap format) is stored.

  The heap area 1102 is a storage area used by various application programs activated by the control unit 115. For example, an application program (hereinafter referred to as a standby application) that is activated in the standby mode displays decoded image data (hereinafter referred to as an image) stored in the heap area 1102 when displaying an image for wallpaper on the display unit 107. Save the instance).

  Note that the storage area secured in the heap area 1102 by the running application program is released when the application ends. For example, the image instance storage area secured in the heap area 1102 by the standby application is released when the standby application ends. Therefore, when the standby application is terminated in order to shift from the standby mode to another operation mode (such as a call mode), the image instance stored in the heap area 1102 is once deleted. When returning from another mode to the standby mode and the standby application is restarted, the standby application stores the image instance in the heap area 1102 again.

  As described above, the storage unit 110 that is used as a temporary storage area is configured by, for example, a randomly accessible storage device. Specifically, it is configured by a RAM such as SRAM or DRAM.

  The time data generation unit 111 generates time data indicating the time. For example, data representing the hour, minute and second of the current time, data representing the elapsed time since the system was started (for example, when the power is turned on), and the like are generated.

  The control unit 115 comprehensively controls the overall operation of the apparatus. That is, various processes such as voice calls performed via a circuit switching network, creation and transmission / reception of e-mails, browsing of Web sites on the Internet, and reproduction of image files stored in the storage unit 109 are executed in appropriate procedures. As described above, transmission / reception of signals in the communication unit 102, input / output of audio in the audio processing unit 104, decoding of image data in the decoding unit 108, and display of images on the display unit 107 are controlled.

  In the example of FIG. 1, the control unit 115 includes a computer, and executes the various processes described above according to a computer program. That is, the control unit 115 loads a program such as an operating system or an application program stored in the storage unit 109 to the storage unit 110, sequentially reads the instruction codes from the storage unit 110, and executes processing.

  The control unit 115 executes some of the various processes described above by an application program that operates under a predetermined execution environment program (platform). For example, processing such as browsing a website on the Internet and displaying a wallpaper image in the standby mode is executed by the application program. When a predetermined event occurs in response to an input operation of the key input unit 103 or the like, the execution environment program starts a predetermined application program corresponding to the event and executes a specific process.

  The standby application described above is one such application program. The control unit 115 executes display processing of wallpaper (background image) in the standby mode by the standby application. That is, the image file stored in the storage unit 109 is reproduced as a wallpaper (background image) in the standby mode.

  When a predetermined event occurs, the control unit 115 starts reproducing the moving image of the image file FIL. For example, when an instruction is input to the key input unit 103 to change the image file for wallpaper from another image file (not shown) stored in the storage unit 109 to the moving image file FIL, When an instruction is input to the key input unit 103 to return from the operation mode (for example, the call mode) to the standby mode, reproduction of the moving image is started.

  When starting playback of a moving image, first, the control unit 115 displays the first still image of the moving image file FIL on the display unit 107 based on image data stored in the wallpaper image storage area 1101 of the storage unit 110. indicate. That is, the image data stored in the wallpaper image storage area 1101 of the storage unit 110 is stored in the heap area 1102 as an image instance of the first still image, and this image instance is rendered on the screen of the display unit 107. Thereby, the first still image of the moving image is immediately displayed on the display unit 107 without executing the decoding process.

Next, the control unit 115 reads the image file FIL from the storage unit 109, and the decoding unit 108 decodes the image data of the second still image (second still image) to be displayed after the first still image. . The decoding process of the image file FIL in the decoding unit 108 may be performed continuously as long as there is room in the temporary storage memory built in the decoding unit 108, or one still image may be processed. While the image is being displayed, the next still image may be decoded one by one. When the decoding process of the next still image of the first image is completed, the control unit 115 stores the decoded image data of the next still image in the heap area 1102 as an image instance of the second still image.
Note that the control unit 115 obtains information regarding the display time 'T2' of each still image from the image file FIL when performing this decoding process.

  The control unit 115 switches the display image on the display unit 107 from the first still image to the next still image when the time “T2” has elapsed since the start of displaying the first still image. That is, the image instance of the second still image stored in the heap area 1102 is drawn on the screen of the display unit 107.

  For example, the control unit 115 ends the decoding of the image data of the second still image to be displayed next to the decoding unit 108 after the display unit 107 starts displaying the first still image. The time “T4” until the time is acquired, and the difference “T2−T4” between the times “T2” and “T4” is calculated. Then, when the time “T2-T4” has elapsed since the decoding of the second still image was completed, the display image on the display unit 107 is switched.

  For example, the control unit 115 acquires time “T4” based on the time data generated by the time data generation unit 111. That is, the time data acquired from the time data generation unit 111 when the display unit 107 starts displaying the first still image (time 'T1'), and the second still image that the decoding unit 108 should display next. The time difference “T3−T1” between time “T3” and “T1” is calculated based on the time data acquired from the time data generation unit 111 when the decoding of the image data is completed (time “T3”) By doing so, time “T4” is acquired.

  The control unit 115 repeatedly acquires time data from the time data generation unit 111 after time “T3” when the decoding unit 108 finishes decoding the image data of the second still image to be displayed next. At this time, the time interval for acquiring the time data from the time data generating unit 111 is set to be shorter than the time “T2-T4”. Then, the control unit 115 compares the time data acquired from the time data generation unit 111 at time 'T3' with the time data repeatedly acquired from the time data generation unit 111, and the elapsed time from the time 'T3' Monitor whether T2-T4 'is reached. When the elapsed time from time “T3” reaches time “T2-T4”, the control unit 115 switches the display image on the display unit 107 from the first still image to the second still image.

  When the time “T4” is longer than the time “T2”, that is, when the time “T2” has elapsed since the start of the display of the first still image, the decoding unit 108 decodes the second still image. If the processing has not been completed and the display time of the first still image has already exceeded 'T2' when the decoding unit 108 has completed the decoding process for the second still image, the control unit 115 The display image on the display unit 107 is switched immediately after the end of decoding, not when the time “T2” has elapsed since the start of the still image display.

  Here, two operation examples of the image display apparatus shown in FIG. 1 having the above-described configuration will be described with reference to the flowcharts of FIGS.

  FIG. 2 is a flowchart showing a first operation example of the image display apparatus shown in FIG.

  When receiving an instruction to display the image file FIL as the image file for wallpaper, or when receiving an instruction to return to the standby mode from another operation mode, the control unit 115 displays the image file FIL using the wallpaper application. To start.

First, the control unit 115 determines whether or not the decoded image data (for example, image data in bitmap format) of the top image of the image file FIL is stored in the wallpaper image storage area 1101 of the storage unit 110 (step ST101). ).
When image data is stored in the wallpaper image storage area 1101, the control unit 115 stores the image data in the heap area 1102 as an image instance for wallpaper (step ST103).
When the image data is not stored in the wallpaper image storage area 1101, the control unit 115 decodes the image data of the first still image included in the image file FIL in the decoding unit 108, and the image data of the decoding result is displayed. It is stored in the wallpaper image storage area 1101 (step ST102). Then, the image data stored in the wallpaper image storage area 1101 is stored in the heap area 1102 as an image instance for wallpaper (step ST103).

  Next, the control unit 115 draws the image data stored in the heap area 1102 on the screen of the display unit 107 (step ST104). As a result, the first still image of the moving image is displayed on the screen of the display unit 107.

  When the display of the first still image is started, the control unit 115 acquires time data from the time data generation unit 111 (step ST105). The control unit 115 stores the time data acquired at this time in the storage unit 110 as time data indicating the display start time ‘T1’ of the first still image.

  Next, the control unit 115 reads the image file FIL stored in the storage unit 109, and in the decoding unit 108, decodes all image data of the image file FIL including the second still image to be displayed next to the first still image. Decoding is performed (step ST106). Further, at this time, information regarding the specified display time “T2” of each still image included in the image file FIL is acquired and stored in the storage unit 110.

  When the decoding process of the second still image is completed in the decoding unit 108, the control unit 115 acquires the image data of the decoding result from the decoding unit 108, and stores it in the heap area 1102 as an image instance of the second still image. Save (step ST107).

  Further, when the decoding process of the second still image is completed, the control unit 115 acquires time data from the time data generation unit 111 (step ST108). The control unit 115 stores the time data acquired at this time in the storage unit 110 as time data indicating the decoding processing end time ‘T3’ of the second still image.

Here, based on the time data of the display start time “T1” acquired in step ST105 and the time data of the decoding process end time “T3” acquired in step ST108, the control unit 115 determines the second still image. Time “T4” (= T3−T1) required for completion of the decoding process is calculated (step ST109).
Then, the control unit 115 compares the decoding processing time 'T4' with the specified display time 'T2' of each still image (step ST110), and the specified display time 'T2' is the decoding processing time 'T4'. If “longer”, the waiting time is set to “T2-T4” (step ST111), and after the waiting time of time “T2-T4” has elapsed, the image instance of the second still image is rendered (step ST113). ). If the specified display time 'T2' is shorter than the decoding processing time 'T4', the next still image instance is immediately rendered (step ST113) without providing a waiting time (step ST112).

After that, the control unit 115 determines whether or not a predetermined event for ending the display of the moving image for wallpaper has occurred (step ST114). If such an event has not occurred, the processing after step ST105 is performed. repeat.
That is, time data of a new still image display start time 'T1' is acquired (step ST105), and decoding processing of a still image to be displayed next is executed (step ST106). When the decoding of the next still image is completed, the decoding result is stored as an image instance (step ST107), and time data of decoding processing end time 'T3' is acquired (step ST108). Then, the time 'T4' (T3-T1) required for the decoding process is calculated (step ST109). If the time 'T4' is shorter than the specified display time 'T2', the waiting time 'T2-T4' is calculated. When the time “T4” is longer than the specified display time “T2” after the lapse of time, the next still image is immediately drawn (step ST113).
Therefore, while one still image is displayed on the display unit 107, the decoding unit 108 decodes image data of one still image to be displayed next.

  FIG. 3 is a flowchart showing a second operation example of the image display apparatus shown in FIG.

  In the second operation example, the decoding unit 108 continuously executes still image decoding processing. That is, when the decoding process is started in step ST106, the decoding unit 108 continuously executes not only the second but also the subsequent still image decoding process. For example, the decoding unit 108 has a built-in memory that can hold the decoding results of two or more still images. As long as there is space in the memory, the decoding unit 108 performs a still image decoding process. Therefore, when starting to display the second and subsequent still images, the decoding unit 108 has already finished decoding the still image to be displayed next, or proceeds with the decoding process halfway. Yes.

  Steps ST101 to ST114 in the flowchart shown in FIG. 3 are the same as the steps with the same reference numerals in the flowchart shown in FIG. The flowchart in FIG. 3 differs from the flowchart shown in FIG. 2 in that, when it is determined in step ST114 that display of a moving image is continued, the process returns to the image instance storage process in step ST107 through the processes in steps ST115 and ST116 described below. .

  If it is determined in step ST114 that the moving image display process is to be continued, control unit 115 obtains time data from time data generation unit 111 (step ST115). The control unit 115 stores the time data acquired at this time in the storage unit 110 as time data indicating the display start time ‘T1’ of the still image currently being displayed.

  Next, the control unit 115 determines whether or not the decoding process of the still image to be displayed next is completed in the decoding unit 108 (step ST116), and determines that the decoding process is completed, the process proceeds to step ST107. Return. Then, the decoded image data is stored in the heap area 1102 as an image instance of a still image to be displayed next. Thereafter, the control unit 115 executes the processing of steps ST108 to ST113 described above, and when the specified time 'T2' has elapsed from the display start time 'T1' of the still image currently being displayed, the control unit 115 Switch the display image to the next still image.

As described above, according to the image display device according to the present embodiment, when starting to display a moving image for wallpaper, the head corresponding to the image data stored in advance in the wallpaper image storage area 1101 of the storage unit 110. The image data of the still image is displayed on the display unit 107, and then the image data of the second still image to be displayed next to the first still image is decoded by the decoding unit. Then, when a predetermined time “T2” has elapsed since the start of the display of the first still image, the image displayed on the display unit 107 is switched from the first still image to the second still image.
In this way, by displaying the head still image based on the image data decoded in advance, the delay in the start of display can be suppressed, and a specified time 'T2' from the start of the display of the head still image. By switching the display image on the display unit 107 to the next still image when the time elapses, the display time of the first still image can be set to the prescribed time 'T2'. Accordingly, it is possible to smoothly reproduce a moving image while suppressing a delay in display start.

  Also, according to the image display apparatus of the present embodiment, the time “T4” from the start of displaying the first still image to the end of the decoding process of the next still image is the specified display time “T2”. If it is longer, the display image on the display unit 107 is switched to the next still image immediately after the decoding process ends. As a result, it is possible to minimize the difference between the time for which the first still image is actually displayed and the specified display time ‘T2’, so that the unnaturalness of the moving image can be reduced.

Further, according to the image display device of the present embodiment, the time data generation unit 111 calculates the time “T4” from the start of the display of the first still image to the end of the decoding process of the next still image. By acquiring based on the generated time data, the display image of the display unit 107 can be switched at an accurate timing.
Further, by determining whether or not the time “T2−T4” has elapsed since the decoding process of the next still image has been completed, the display unit 107 The display image can be switched at an accurate timing.

<Second Embodiment>
Next, a second embodiment of the present invention will be described.

  FIG. 4 is a diagram illustrating an example of the configuration of the image display apparatus according to the second embodiment. The image display device shown in FIG. 4 is obtained by replacing the time data generation unit 111 in the image display device shown in FIG. 1 with timer units 112 and 113, and replacing the control unit 115 with a control unit 115A. Is the same as the image display apparatus shown in FIG.

  When the timer unit 112 receives a start request from the control unit 115A, the timer unit 112 starts timing, and when receiving a termination request, the timer unit 112 ends timing. When the time measurement is completed, the control unit 115A is notified of the time from the time measurement start time to the time point.

  When the timer unit 113 receives a request from the control unit 115A to measure a certain set time, the timer unit 113 starts counting, and when the elapsed time from the start time reaches the set time, the timer unit 113 ends timing. When the time measurement is finished, the control unit 115A is notified of this.

  When the display unit 107 starts displaying the first still image, the control unit 115A requests the timer unit 112 to start timing, and the decoding unit 108 finishes decoding the image data of the still image to be displayed next. Then, the timer unit 112 is requested to end timing. Then, the time notified from the timer unit 112 in response to the timing end request is acquired as the above-described decoding processing time 'T4'.

  When the decoding unit 108 finishes decoding the still image data to be displayed next, the control unit 115A sets the time “T2-T4” in the timer unit 113 to request the time measurement. Then, when the timer unit 113 notifies the end of timing after this request, the display image of the display unit 107 is switched.

The overall processing flow in the image display apparatus shown in FIG. 4 is the same as the flowcharts shown in FIGS.
However, control unit 115A obtains time 'T4' based on the notification from timer unit 112 in step ST109. In step ST111, the display image on the display unit 107 is switched in response to the notification from the timer unit 113. The operation of the control unit 115A in other steps is the same as that of the control unit 115 described in the previous embodiment.

As described above, according to the image display apparatus according to the present embodiment, by obtaining the decoding processing time 'T4' using the timer unit 112 that notifies the time from the start time point to the end time point, It is possible to omit the calculation process of the time “T3-T1” in the control unit 115 described above, and the processing of the control unit 115A can be simplified.
In addition, according to the image display device according to the present embodiment, the display image of the display unit 107 may be switched when receiving a notification of the end of timing from the timer unit 113. The monitoring process can be omitted, and the process of the control unit 115A can be simplified.

<Third Embodiment>
Next, a third embodiment of the present invention will be described.

  FIG. 5 is a diagram illustrating an example of the configuration of the image display apparatus according to the third embodiment. The image display device shown in FIG. 5 is obtained by replacing the time data generation unit 111 in the image display device shown in FIG. 1 with a timer unit 114, and replacing the control unit 115 with a control unit 115B. 1 is the same as the image display apparatus shown in FIG.

  When the timer unit 114 receives a start request from the control unit 115B, the timer unit 114 starts timing, and when the timer unit 114 receives a notification request from the control unit 115B, the timer unit 114 notifies the time “T5” from the start point of the time measurement. Further, when receiving a request for initializing the time measurement from the control unit 115B, the time measurement is terminated and the time 'T5' is initialized.

  The control unit 115B requests the timer unit 114 to start timing when the display unit 107 starts displaying the first still image. After this timing start request, the timer unit 114 is repeatedly requested for time notification at a time interval shorter than the prescribed display time 'T2' of each still image, and the time 'T5' notified in response to this request is Monitor whether the specified display time 'T2' has been reached. When the time “T5” notified from the timer unit 114 reaches the specified display time “T2”, the control unit 115 switches the display image on the display unit 107 to the next still image.

  Two operation examples of the image display apparatus shown in FIG. 5 having the above-described configuration will be described with reference to the flowcharts of FIGS.

  FIG. 6 is a flowchart showing a first operation example of the image display apparatus shown in FIG.

When receiving an instruction to start displaying a moving image of the image file FIL as a wallpaper image, the control unit 115B first decodes the decoded image data (for example, an image in a bitmap format) of the first image of the image file FIL. It is determined whether or not (data) is stored in the wallpaper image storage area 1101 of the storage unit 110 (step ST201).
When image data is stored in the wallpaper image storage area 1101, the control unit 115B stores the image data in the heap area 1102 as an image instance for wallpaper (step ST203).
When the image data is not stored in the wallpaper image storage area 1101, the control unit 115B decodes the image data of the first still image included in the image file FIL in the decoding unit 108, and the image data of the decoding result is displayed. It is stored in the wallpaper image storage area 1101 (step ST202). Then, the image data stored in the wallpaper image storage area 1101 is stored in the heap area 1102 as an image instance for wallpaper (step ST203).

  Next, control unit 115B draws the image data stored in heap area 1102 on the screen of display unit 107 (step ST204). As a result, the first still image of the moving image is displayed on the screen of the display unit 107.

  When display of the first still image is started, control unit 115B requests timer unit 114 to start timing (step ST205), and timer unit 114 starts timing.

  Next, the control unit 115B reads the image file FIL stored in the storage unit 109, and the decoding unit 108 decodes the image data of the second still image to be displayed next to the first still image (step ST206). . Further, at this time, information regarding the specified display time “T2” of each still image included in the image file FIL is acquired and stored in the storage unit 110.

  When the decoding process of the second still image is completed in the decoding unit 108, the control unit 115B acquires the image data of the decoding result from the decoding unit 108, and stores it in the heap area 1102 as an image instance of the second still image. Save (step ST207).

  Further, when the decoding process of the second still image is completed, control unit 115B repeatedly requests time notification from timer unit 114, and time 'T5 notified from timer unit 114 in response to this request. It is monitored whether “has reached the prescribed display time“ T2 ”of the still image (steps ST208 and ST209). When the time “T5” reaches the specified display time “T2”, the control unit 115B renders an image instance of the next still image (step ST210), and initializes the timed time “T5” of the timer unit 114 (step ST210). ST211). If it is determined in step ST209 that the time “T5” notified from the timer unit 114 has not reached the prescribed still image display time “T2”, the process returns to step ST208, and the timed time “T5” is returned. Until the specified display time 'T2' is reached.

Thereafter, control unit 115B determines whether or not a predetermined event for ending the display of the moving image for wallpaper has occurred (step ST212). If such an event has not occurred, the process from step ST205 is performed. repeat.
That is, the timer unit 114 is requested again to start timing (step ST205), and the still image decoding process to be displayed next to the currently displayed still image is executed (step ST206). When the decoding of the next still image is completed, the decoding result is stored as an image instance (step ST207), and it is monitored whether the time count “T5” of the timer unit 114 has reached the specified display time “T2” (step ST207). Steps ST208 and ST209). When the measured time 'T5' reaches the specified display time 'T2', the display image on the display unit 107 is switched to the next still image (step ST210), and the measured time 'T5' of the timer unit 114 is initialized ( Step ST211).
Therefore, while one still image is displayed on the display unit 107, the decoding unit 108 decodes image data of one still image to be displayed next.

  FIG. 7 is a flowchart showing a second operation example of the image display apparatus shown in FIG.

  In the second operation example, the decoding unit 108 continuously executes still image decoding processing. That is, when the decoding process is started in step ST206, the decoding unit 108 continuously performs the decoding process of not only the second but also the subsequent still images as in the case of the flowchart of FIG. To run.

  Steps ST201 to ST212 in the flowchart shown in FIG. 7 are the same as the steps with the same reference numerals in the flowchart shown in FIG. The flowchart in FIG. 7 differs from the flowchart shown in FIG. 6 in that, when it is determined in step ST212 that display of a moving image is continued, the process returns to the image instance storage process in step ST207 through the processes in steps ST213 and ST214 described below. .

  If it is determined in step ST212 that the moving image display process is to be continued, control unit 115B requests timer unit 114 to start timing again (step ST213). Next, the control unit 115B determines whether or not the decoding process of the still image to be displayed next in the decoding unit 108 has been completed (step ST214). If it is determined that the decoding process has been completed, the control unit 115B proceeds to step ST207. Return. Then, the decoded image data is stored in the heap area 1102 as an image instance of a still image to be displayed next. Thereafter, the control unit 115B executes the processes of steps ST208 to ST211 described above, and displays a display image on the display unit 107 when a predetermined time 'T2' has elapsed from the display start time of the still image currently being displayed. Switch to the next still image.

  As described above, according to the image display apparatus according to the present embodiment, by monitoring whether the time “T5” counted by the timer unit 114 has reached the specified display time “T2”, the first image is displayed. The display time of each still image that is included can be matched with the specified display time 'T2'. This makes it possible to omit the calculation process (such as the calculation of time ‘T3-T1’ or ‘T2-T4’) in the image display apparatus illustrated in FIG. 1, thereby simplifying the process of the control unit 115B.

  As mentioned above, although several embodiment of this invention was described, this invention is not limited only to embodiment mentioned above, Various modifications are included.

For example, in the first embodiment described above, as a result of comparing the decoding processing time 'T4' with the specified display time 'T2' of each still image (step ST110 in FIG. 2), the specified display time 'T2' Is longer than the decoding processing time 'T4', a waiting time 'T2-T4' is set, and an image instance of the second still image is drawn after the waiting time 'T2-T4' has elapsed ( Although steps ST111 and ST113 in FIG. 2 are used, the present invention is not limited to this. For example, as shown in the flowchart of FIG. 8, when the decoding processing time “T4” and the specified display time “T2” of each still image are longer than the decoding processing time “T4”, FIG. As in steps ST208 and ST209 of the flowchart shown in FIG. 7, the timer unit 114 obtains the time “T5” (step ST1111), and whether this time “T5” has reached the specified display time “T2”. Monitoring (step ST1112), when the timed time 'T5' reaches the specified display time 'T2', the display image of the display unit 107 is switched to the next still image (step ST113), and the timed time of the timer unit 114 ' T5 ′ may be initialized (step ST211).
Also in this case, as in the first embodiment, the second still image displayed next to the first still image when a predetermined time 'T2' has elapsed since the display of the first still image has started. The image can be displayed on the display unit 107. Further, as in the third embodiment, the calculation process of the waiting time “T2-T4” can be omitted, so that the process of the control unit 115B can be simplified.

  In the above-described embodiment, the case where a moving image is displayed in the standby mode is taken as an example, but the present invention is not limited to this. That is, the present invention can be applied to a case where a moving image is displayed in various other operation modes.

  All of the functions of each component of the image display apparatus may be realized by software, or at least a part thereof may be realized by hardware. For example, the processing in the control unit 115 and the data processing in the communication unit 102, the audio processing unit 104, and the decoding unit 108 may be realized on a computer by one or a plurality of programs, at least a part of which is hardware It may be realized with.

  In the above-described embodiment, a case where a moving image is displayed on a mobile phone is described as an example. However, the present invention is not limited to this, and the present invention can be applied to various devices capable of displaying a moving image.

It is a figure which shows an example of a structure of the image display apparatus which concerns on 1st Embodiment. 3 is a flowchart illustrating a first operation example of the image display apparatus illustrated in FIG. 1. 6 is a flowchart illustrating a second operation example of the image display apparatus illustrated in FIG. 1. It is a figure which shows an example of a structure of the image display apparatus which concerns on 2nd Embodiment. It is a figure which shows an example of a structure of the image display apparatus which concerns on 3rd Embodiment. 6 is a flowchart illustrating a first operation example of the image display apparatus illustrated in FIG. 5. 6 is a flowchart showing a second operation example of the image display device shown in FIG. 5. It is a flowchart which shows the modification of the image display apparatus shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Antenna, 102 ... Communication part, 103 ... Key input part, 104 ... Sound processing part, 105 ... Speaker, 106 ... Microphone, 107 ... Display part, 108 ... Decoding part, 109, 110 ... Storage part, 111 ... Time Data generation unit, 112-114... Timer unit, 115, 115A, 115B... Control unit, 1101.

Claims (9)

An image display device that sequentially displays a series of still images,
First storage means for storing encoded image data of a series of still images;
Decoding means for decoding the encoded image data;
Second storage means for storing decoded image data of a leading still image in the series of still images;
Display means for displaying a still image corresponding to the image data decoded by the decoding means;
Upon receiving an instruction to start displaying the series of still images, the first still image corresponding to the image data stored in the second storage unit is displayed on the display unit, and at least the first still image is displayed. When image data of the second still image to be displayed next is read from the first storage means and decoded by the decoding means, and the first time has elapsed since the start of the display of the leading still image And an image display device comprising: a control unit that switches the image displayed on the display unit from the first still image to the second still image. The control means performs a second period from when the display means starts displaying the first still picture until when the decoding means finishes decoding the image data of the second still picture to be displayed next. When the second time is shorter than the first time, when the first time has elapsed since the start of the display of the first still image, the time is displayed on the display means. The image display device according to claim 1, wherein the image is switched from the first still image to the second still image. The control means performs a second period from when the display means starts displaying the first still picture until when the decoding means finishes decoding the image data of the second still picture to be displayed next. And the difference between the first time and the second time is calculated as a third time, and the display image is switched when the third time has elapsed since the end of the decoding. The image display device according to claim 1, wherein the image display device is performed. 4. The image according to claim 2, wherein, when the second time is longer than the first time, the control unit performs switching of the display image immediately after completion of the decoding. 5. Display device. Time data generating means for generating time data indicating the time,
The control means decodes the time data acquired from the time data generating means when the display means starts displaying the first still picture and the image data of the still picture to be displayed next by the decoding means. 5. The image display device according to claim 3, wherein the second time is acquired based on time data acquired from the time data generation unit when the processing is completed. The display means switches images to be displayed at a predetermined interval when sequentially displaying still images corresponding to the image data decoded by the decoding means,
The image display device according to claim 1, wherein the first time is set to be substantially the same as the predetermined interval. An image display method for sequentially displaying a series of still images,
Storing encoded image data of a series of still images in a first storage means;
Decoding the encoded image data of the leading still image in the series of still images and storing it in the second storage means;
Upon receiving an instruction to start displaying the series of still images, the display unit displays the first still image based on the decoded image data stored in the second storage unit,
Decoding at least the encoded image data of the second still image to be displayed next to the first still image stored in the first storage means;
An image display method comprising: switching an image to be displayed on the display unit from the first still image to the second still image when a first time has elapsed since the start of displaying the first still image. When the first time has elapsed from the start of the display of the first still image and the image data is being decoded, the display image is switched immediately after the decoding process is completed. The image display method according to claim 7, wherein the image display method is performed. When sequentially displaying still images corresponding to the decoded image data, it is displayed with a predetermined interval,
The image display method according to claim 7 or 8, wherein the first time is set to be substantially the same as the predetermined interval.

Images