JP2008066818A - Image reproduction system, control method of image reproducing device, and image reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the power consumption of a device side having, for example, a small battery remaining capacity as small as possible and to display an image quickly by efficiently using a cache memory according to power source states and a communication state. <P>SOLUTION: An image reproducing device 100 switches between image data to be deleted from the cache memory 30 and image data to be added to the cache memory 30 according to the power source states of a storage device 101 and the image reproducing device 100 and the state of communication between the storage device 101 and image reproducing device 100. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for switching image data in a cache memory in accordance with a power supply state between a storage device and an image reproduction device.

  Conventionally, an imaging apparatus such as a digital camera can reproduce and display a captured image. The user can check the result of shooting the photographed image, and an image that the user does not want can be deleted.

  In addition, in order to back up captured images, a digital camera and a PC (personal computer) are connected or a removable medium is inserted into the PC. In recent years, it has been possible to connect a digital camera and a storage device having a large-capacity recording medium without using a PC, and store a captured image or reproduce and display a captured image. In addition, an image in a recording medium inserted in a digital camera or an image in a storage device can be reproduced and displayed. In addition, portable storage devices have appeared and can be battery powered.

  On the other hand, in order to perform image reproduction at high speed, a method of using a memory included in a digital camera as a reproduction image cache memory is used. When the capacity of the cache memory is insufficient, it is common to store new image data in place of the lowest priority data according to some priority for the data.

  For example, cache memory management is performed by the LRU method (Least Recently Used). The LRU method is a method in which image data is discarded from the cache memory sequentially from the least used one. When reproducing new image data, it is confirmed whether the image data exists in the cache memory, and if it exists, the corresponding image data is discarded from the cache memory by the LRU method. Next, the reproduced image data is stored in the cache memory.

  Also, a method has been proposed in which image data to be replaced is determined based on the time required for decoding compressed and stored image data (see, for example, Patent Document 1).

  The invention disclosed in Patent Document 1 determines the image data to be replaced based on the time required to decode the compressed and stored image data, and places the image data that takes time to decode in the cache memory. Image data can be played back at high speed. Also, images that do not take much time to decode are not placed in the cache memory, but the average playback time can be increased.

JP 2005-74626 A

  However, when image data that is not stored in the cache memory exists in the storage device, power consumption due to communication with the storage device and power consumption due to media access in the storage device occur each time an image is reproduced. When the battery state of the digital camera is the full battery state but the battery state of the storage device is the low battery state, the above power consumption causes a problem that the battery runs out and the image cannot be reproduced and displayed.

  On the other hand, when image data that is not stored in the cache memory exists in the digital camera, power consumption occurs due to access to the recording medium of the digital camera. When the battery state of the digital camera is a low battery state, the above power consumption causes a problem that the battery runs out and an image cannot be reproduced and displayed.

  Accordingly, an object of the present invention is to efficiently use a cache memory according to the power supply state and communication state, for example, to suppress power consumption on the device side where the remaining battery level is low as much as possible and to display an image at high speed. It is in.

An image reproduction system according to the present invention includes a recording unit that records image data, a storage device that includes a communication unit that can be connected to an external device, and a connection unit that connects a recording medium that records image data. , A communication unit capable of communicating with the storage device, a cache memory for temporarily storing image data recorded in at least one of the recording unit and the recording medium, and an image recorded in the cache memory An image reproduction device comprising display control means for displaying data on an image display means, and capable of grasping a power supply state between the storage device and the image reproduction device and a communication state between the storage device and the image reproduction device. In the image reproduction system including the image reproduction device, the power state of the storage device, the power state of the image reproduction device Depending on the fine said communication state, and having a control means for the switching between the image data to be added to the image data to be deleted from the cache memory to the cache memory.
An image reproducing apparatus control method according to the present invention is a method for controlling an image reproducing apparatus capable of communicating with a storage apparatus including a recording unit that records image data and a communication unit that can be connected to an external apparatus. A detection step of detecting a power state between the storage device and the image reproduction device and a communication state between the storage device and the image reproduction device; a power state of the storage device; The image data to be deleted from the cache memory for temporarily recording the image data recorded in at least one of the recording medium for recording the image data and the recording means according to the power supply state and the communication state, and the cache A control step of switching image data to be added to the memory, and image data recorded in the cache memory Characterized in that it comprises a display control step of displaying on the device.
An image reproduction apparatus according to the present invention is an image reproduction apparatus capable of communicating with a storage device that has a recording unit that records image data and a communication unit that can be connected to an external device and that can grasp a power supply state. Detecting means for detecting a power state of the apparatus and the image reproduction apparatus, and a communication state between the storage apparatus and the image reproduction apparatus, a power state of the storage apparatus, a power state of the image reproduction apparatus, and the communication state In accordance with the image data to be recorded, the image data to be deleted from the cache memory for temporarily recording the image data recorded on at least one of the recording medium and the recording means, and the image data to be added to the cache memory And a display control means for displaying the image data recorded in the cache memory on the image display means. Characterized in that it comprises and.

  In the present invention, the image data to be deleted from the cache memory and the image data to be added to the cache memory are switched according to the power supply state of the storage device, the power supply state of the image reproducing device, and the communication state therebetween. Therefore, according to the present invention, the cache memory can be used efficiently according to the power supply state and the communication state. For example, the power consumption on the device side where the remaining battery level is low is suppressed as much as possible, and an image is displayed at high speed. can do.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments to which the invention is applied will be described in detail with reference to the accompanying drawings.

<First Embodiment>
First, a first embodiment of the present invention will be described. FIG. 1 is a diagram showing a configuration example of an image reproduction system according to an embodiment of the present invention.

  Reference numeral 100 denotes an image reproducing device, which includes an image display unit 28 composed of a TFT LCD or the like, a power source unit 86 composed of a battery or an AC adapter, an internal medium 99 such as SD / CF, and a wireless communication unit 33 such as a WLAN. Is done. The image display unit 28 displays the image data recorded in the internal medium 99 and the image data recorded in the large-capacity recording medium 17.

  A storage device 101 is connected to the image playback device 100 by wireless communication, and includes a power supply unit 11 including a battery and an AC adapter, a large capacity recording medium 17 such as an HDD, and a wireless communication unit 20 such as a WLAN.

  FIG. 2 is a block diagram showing in more detail the internal configuration of the image reproduction system shown in FIG. First, the block of the image playback device 100 will be described.

  A memory control circuit 22 controls the image display memory 24, the D / A converter 26, the memory 30, and the compression / decompression circuit 32.

  Reference numeral 24 denotes an image display memory, 26 denotes a D / A converter, 28 denotes an image display unit including a TFT LCD, and the image data for display written in the image display memory 24 passes through the D / A converter 26. Displayed by the image display unit 28. The image display unit 28 can arbitrarily turn on / off the display according to an instruction from the system control circuit 50. When the display is turned off, the power consumption of the image reproducing device 100 can be greatly reduced. Can do.

  Reference numeral 30 denotes a memory for storing reproduced image data, which has a storage capacity sufficient for storing a predetermined number of still image data and moving image data for a predetermined time. Further, even when a plurality of still image data are continuously reproduced, it is possible to read and write a large amount of images to the memory 30 at high speed. Thereby, it can be used as a cache memory for performing image reproduction. The memory 30 can also be used as a work area for the system control circuit 50.

  Reference numeral 32 denotes a compression / decompression circuit that compresses and decompresses image data by adaptive discrete cosine transform (ADCT), wavelet transform, etc., and reads the image stored in the memory 30 to perform compression processing or decompression processing. Is written into the memory 30.

  Reference numeral 50 denotes a system control circuit that controls the entire image reproducing apparatus 100, and reference numeral 52 denotes a memory that stores constants, variables, programs, and the like for operation of the system control circuit 50.

  Reference numeral 54 denotes a display unit such as a liquid crystal display device or a speaker that displays an operation state, a message, or the like using characters, images, sounds, or the like in accordance with execution of a program in the system control circuit 50. The display unit 54 is installed at a single or a plurality of positions near the operation unit of the image reproduction apparatus 100 so as to be easily visible, and is configured by a combination of an LCD, an LED, a sound generation element, and the like.

  Further, among the display contents of the display unit 54, what is displayed on the LCD or the like is, for example, a clock battery remaining amount display, a battery remaining amount display, an error display, an information display by a multi-digit number, and the attachment / detachment of the recording medium 99. There are status display, communication I / F operation display, date / time display, and the like. In addition, display of image files stored on recording media, list display of image file names stored on recording media, display of connection status with external computer, display of connection status with external storage, etc. is there. In addition, there is a display indicating the transmission / reception state of data such as an image file with an external computer or external storage.

  Reference numeral 56 denotes an electrically erasable / recordable nonvolatile memory such as an EEPROM or a flash memory.

  Reference numerals 60 and 70 denote operation means for inputting various operation instructions of the system control circuit 50, and are configured by a single or a combination of a switch, a dial, a touch panel, pointing by eye-gaze detection, a voice recognition device, or the like.

Here, a specific description of these operating means will be given.
Reference numeral 60 denotes a power switch (main switch) that can switch and set the power-on and power-off modes of the image playback apparatus 100. In addition, the power-on and power-off settings of various accessory devices connected to the image reproduction device 100 can be switched and set together.

  An operation unit 70 includes various buttons and a touch panel. The operation unit 70 includes a menu button, a set button, a macro button, a multi-screen playback page break button, a menu movement + (plus) button, a menu movement − (minus) button, a playback image movement + (plus) button, and a playback image −. Includes a (minus) button. Further, a date / time setting button, an image display ON / OFF button, a compression mode switch, a selection / switching switch for setting selection and switching of various functions when performing reproduction and / or communication, and the like are also included. In addition, there are a determination / execution switch for determining and executing various functions, user settings, property settings for images, and the like when executing reproduction and / or communication. Note that one of the properties for an image includes a compression permission attribute for the image.

  Reference numeral 80 denotes power supply control means. The power supply control means 80 includes a battery detection circuit, a DC-DC converter, a switch circuit that switches a block to be energized, and the like. The power control means 80 detects the presence / absence of a battery, the type of battery, and the remaining battery level. Then, the power control unit 80 controls the DC-DC converter based on the detection result and the instruction from the system control circuit 50, and supplies a necessary voltage to each unit including the recording medium for a necessary period. The system control circuit 50 can determine the state of the battery as Full / Half / Low / Empty from the remaining battery level and calculate the remaining battery time.

  Reference numeral 86 denotes a power supply means including a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a NiCd battery, a NiMH battery, or a Lo-ion battery, an AC adapter, or the like.

  Reference numeral 90 denotes an interface with a recording medium such as a memory card or a hard disk. Reference numeral 99 denotes a recording medium such as a memory card or a hard disk. Also, it is assumed that the recording medium can acquire the currently available free space. Furthermore, power consumption for media access can be calculated and notified to the system control circuit 50. In this embodiment, the recording medium 99 is described as being built in the image reproducing apparatus 100.

  33 is a communication means. The communication means 33 has various communication functions such as wireless communication such as WLAN (Wireless Local Area Network), infrared communication such as IrDA (Infrared Data Association), and optical communication. Moreover, the structure provided with the one part combination of them may be sufficient. Further, the communication unit 33 calculates the communication state and the power consumption associated with the communication, and notifies the system control circuit 50 of the detection result.

Next, the block of the storage apparatus 101 will be described.
Reference numeral 19 denotes a memory for storing transfer images, which has a storage capacity sufficient to store a predetermined number of still images. High-speed and large-scale image reading / writing can be performed on the memory 19. Thus, it can be used as a cache memory for performing image transfer. The memory 19 can also be used as a work area for the system control circuit 12.

  A system control circuit 12 controls the entire storage apparatus 101, and a memory 14 stores constants, variables, programs, and the like for the operation of the system control circuit 12.

  Reference numeral 16 denotes a display unit such as a liquid crystal display device or a speaker that displays an operation state, a message, or the like using characters, images, sounds, or the like in accordance with execution of a program in the system control circuit 12. The display unit 16 is installed in a single or a plurality of locations near the operation unit of the storage device 101 and easily visible, and is configured by a combination of, for example, an LCD, an LED, a sounding element, and the like.

  Among the display contents of the display unit 16, what is displayed on the LCD or the like includes, for example, a battery remaining amount display, an error display, a communication I / F operation display, a display indicating a connection state with an external computer, and external image reproduction. There is a display showing the connection status with the device. Furthermore, there is a display showing a state of transmission / reception of data such as an image file with an external computer or an external image reproduction apparatus.

  Reference numeral 15 denotes an electrically erasable / recordable nonvolatile memory such as an EEPROM or a flash memory.

  Reference numeral 13 denotes a power switch (main switch) that can switch and set the power-on and power-off modes of the storage apparatus 101.

  Reference numeral 10 denotes a power supply control means, which includes a battery detection circuit, a DC-DC converter, a switch circuit that switches blocks to be energized, and the like. The power control means 10 detects the presence / absence of a battery, the type of battery, and the remaining battery level. Then, the power control unit 10 controls the DC-DC converter based on the detection result and the instruction from the system control circuit 12, and supplies a necessary voltage to each unit including the recording medium for a necessary period. The system control circuit 12 can determine the state of the battery as Full / Half / Low / Empty from the remaining battery level and calculate the remaining battery time.

  Reference numeral 11 denotes a power supply means including a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a NiCd battery, NiMH battery or Li-ion battery, an AC adapter, or the like.

  Reference numeral 18 denotes an interface with a recording medium such as a memory card or a hard disk. Reference numeral 17 denotes a recording medium such as a memory card or a hard disk. Further, it is assumed that the recording medium 17 can acquire the currently available free space. Further, power consumption for media access can be calculated and notified to the system control circuit 12. In this embodiment, the recording medium 17 is described as being built in the storage apparatus 101.

  Reference numeral 20 denotes a communication means. The communication means 33 has various communication functions such as wireless communication such as WLAN (Wireless Local Area Network), infrared communication such as IrDA (Infrared Data Association), and optical communication. Moreover, the structure provided with the one part combination of them may be sufficient. In addition, the communication unit 20 detects the communication state and calculates the power consumption associated with the communication, and notifies the system control circuit 12 of the results.

  FIG. 3 is an SDL diagram (a diagram using a definition of a specification description language [Specification and Description Language] designed in accordance with International Telecommunication Union standards) showing an image reproduction display process in the image reproduction apparatus 100. is there.

  First, referring to FIG. 3A, in step 301, the image reproduction device 100 is in a power OFF state. When the power is turned on by the user operating the power switch (main switch) 60, the system control circuit 50 receives a power-on event in step 303 and transitions to an idle state (step 305).

  Next, referring to FIG. 3B, in step 305, when the user operates the operation unit 70 to switch to the playback mode, the system control circuit 50 receives the playback mode switching event in step 307. Proceed to step 309. In step 309, the system control circuit 50 starts connection with the storage apparatus 101. Although not shown, information on the radio wave state, the battery state of the image playback device and the storage device, and the power consumption information by media access in the storage device 101 is exchanged at the time of connection. The system control circuit 50 stores the acquired information in the memory 52.

  In step 311, the system control circuit 50 determines whether the storage apparatus 101 can be connected. If the connection is established, the system control circuit 50 proceeds to step 312. In step 312, the system control circuit 50 initializes cache memory allocation and proceeds to step 314.

  In step 314, the system control circuit 50 sorts the image data present in the image playback device 100 and the storage device 101, and transitions to the image playback state (step 315). On the other hand, if the connection cannot be established, the system control circuit 50 proceeds to step 313. In step 313, the system control circuit 50 notifies the display unit 54 that the user cannot connect to the storage apparatus 101. The system control circuit 50 transitions to a state (step 317) in which only the image in the image reproduction device 100 is displayed.

  Next, referring to FIG. 3D, when the user selects the playback image by operating the operation unit 70 in the image playback state (step 315), the system control circuit 50 receives the image selection event in step 319. Then, the process proceeds to step 321.

  In step 321, the system control circuit 50 acquires the selected image data. In step 323, the system control circuit 50 displays the acquired image data on the image display unit 28, and transitions to an image reproduction state (step 315).

  In the image reproduction state (step 315), when the remaining battery level is detected by the power supply control means 80 and it is detected that the remaining battery level has changed, the system control circuit 50 receives the battery state change notification event 325. Go to step 327.

  In step 327, the system control circuit 50 notifies the storage apparatus 103 that the battery state has changed using the communication unit 33. In subsequent step 329, the system control circuit 50 determines what state the battery state of the image reproduction device 100 is.

  When the battery state is the Empty state, the system control circuit 50 transitions to the initial state (step 301). If the battery state is other than Empty, the process proceeds to step 331. In step 331, the system control circuit 50 performs cache memory control, and transitions to an image reproduction state (step 315).

  When the communication means 33 detects that the remaining battery level or remaining time of the storage apparatus 101 has been changed in the image playback state (step 315), the system control circuit 50 detects the battery state change notification event ( Step 333) is received. Then, the process proceeds to Step 335. In step 335, the system control circuit 50 determines what state of the battery of the storage apparatus 101 is.

  If the battery state of the storage apparatus 101 is the Empty state, the system control circuit 50 proceeds to step 337. In step 337, the system control circuit 50 notifies the user that the storage apparatus 101 has been powered off using the display unit 54, and transitions to a state (step 317). If the battery status of the storage apparatus 101 is other than Empty, the process proceeds to step 331. In step 331, the system control circuit 50 performs cache memory control, and transitions to an image reproduction state (step 315).

  When the communication means 33 detects that the communication radio wave state has been changed in the image reproduction state (step 315), the system control circuit 50 receives the communication radio wave state change notification event (step 339) and proceeds to step 341. In step 341, the system control circuit 50 determines what state of the radio wave is.

  If the radio wave state is the disconnected state, the system control circuit 50 proceeds to step 343. In step 343, the system control circuit 50 notifies the user that the storage device 101 has been disconnected using the display unit 54, and transitions to a state (step 317). If the radio wave condition is good or bad, the process proceeds to step 331. In step 331, the system control circuit 50 performs cache memory control, and transitions to an image reproduction state (step 315).

  In the state (step 317), when the user selects the reproduced image by operating the operation unit 70, the system control circuit 50 receives the image selection event in step 319, and proceeds to step 345. In step 345, the system control circuit 50 acquires the selected image data from the inside. In step 347, the system control circuit 50 displays the acquired image data on the image display unit 28, and transitions to a state (step 317).

  In the state (step 317), the remaining amount of battery is detected by the power supply control means 80, and when it is detected that the state of the remaining battery amount has changed, the system control circuit 50 receives a battery state change notification (step event 325). Then, the process proceeds to Step 327. In step 329, the system control circuit 50 determines what state the battery is in. When the battery state is the Empty state, the system control circuit 50 transitions to the initial state (step 301). When the battery state is a state other than Empty, the state transitions to the state (step 317).

FIG. 4 is an SDL diagram showing image reproduction display processing in the storage apparatus 101.
First, referring to FIG. 4A, in the state (step 401), the storage apparatus 101 is in a power OFF state. When the user operates the power switch (main switch) 13 to turn on the power, in step 403, the system control circuit 12 receives the power on event and transitions to the idle state (step 405).

  Next, referring to FIG. 4B, when the connection request event (step 407) is received from the image reproduction device 100 in the state (step 405), the system control circuit 12 proceeds to step 409. In step 409, the system control circuit 12 starts connection with the image reproduction device 100. In step 410, the system control circuit 12 determines whether or not the image reproduction apparatus 100 can be connected. If the connection is established, the system control circuit 12 transitions to a state (step 411). If the connection cannot be established, the system control circuit 12 transitions to a state (step 405).

  Next, referring to FIG. 4C, when the system control circuit 12 receives an image acquisition request event (step 413) from the image reproduction apparatus 100 in the state (step 411), the process proceeds to step 415. In step 415, the system control circuit 12 transfers the requested image data to the image reproducing device 100, and transitions to a state (step 411).

  In the state (step 411), when the communication means 20 detects that the remaining battery level of the image reproduction device 100 has changed, the system control circuit 12 notifies the battery state change notification event of the image reproduction device 100 (step 417). , And proceeds to step 419. In step 419, the system control circuit 12 notifies the user of the remaining battery level of the image playback device 100 using the display unit 16.

  In step 421, the system control circuit 12 determines what state the battery state of the image reproduction device 100 is. When the battery state of the image playback device 100 is the Empty state, the system control circuit 12 transitions to a state (Step 405). On the other hand, when the battery state of the image playback device is a state other than Empty, the system control circuit 12 transitions to a state (step 411).

  In the state (step 411), the battery control unit 10 detects the remaining battery level, and when detecting that the remaining battery level has changed, the system control circuit 12 sends a battery state change notification event (step 423). Then, go to step 425.

  In step 425, the system control circuit 12 notifies the image reproducing apparatus 100 that the battery state of the storage apparatus 101 has changed using the communication unit 20. In step 427, the system control circuit 12 notifies the user that the battery status of the storage apparatus 101 has changed using the display unit 16.

  In step 429, the system control circuit 12 determines what state of the battery of the storage apparatus 101 is. When the battery state is the Empty state, the system control circuit 12 transitions to the initial state (step 401). On the other hand, when the battery state is a state other than Empty, the state transitions to the state (step 411).

  In the state (step 411), when the communication means 20 detects that the communication radio wave state has changed, the system control circuit 12 receives the communication radio wave state change notification event (step 431), and proceeds to step 435. In step 435, the system control circuit 12 uses the display unit 54 to notify the user that the communication radio wave state has changed. In step 437, the system control circuit 12 determines what state of the radio wave is. The system control circuit 12 transitions to a state (step 405) when the radio wave state is a disconnected state. On the other hand, when the radio wave state is good or bad, the system control circuit 12 transitions to a state (step 411).

FIG. 5 is a flowchart showing in detail the image acquisition process in step 321 of FIG.
In step 501, the system control circuit 50 searches whether the acquired image data exists in the cache memory (memory 30). In step 503, the system control circuit 50 determines whether image data exists in the cache memory. If it exists, go to step 505. If not, the process proceeds to step 507. In step 505, the system control circuit 50 acquires image data from the cache memory.

  In step 507, the system control circuit 50 acquires image information of the image data to be acquired. When acquiring image data in the image reproduction apparatus 100, the image information is acquired from the recording medium 99. When acquiring the image data in the remote storage device 101, the communication unit 33 is used to perform image information transfer processing with the storage device 101 to acquire image information.

  In step 509, the system control circuit 50 acquires various types of information such as battery status, communication status, and power consumption. In step 511, the system control circuit 50 determines various information such as the battery status, communication status, and power consumption acquired in step 509, and determines the processing method of the image data and the cache memory. In step 513, the system control circuit 50 performs processing in accordance with the image data and cache memory processing method determined in step 511.

FIG. 6 is a flowchart showing in detail the various state acquisition processing in step 509 of FIG.
In step 601, the system control circuit 50 acquires the battery state of the image reproduction device 100. In step 603, the system control circuit 50 acquires the communication radio wave state. In step 605, the system control circuit 50 acquires the battery status of the storage apparatus 101. In step 607, the system control circuit 50 acquires the power consumption when the image reproducing apparatus 100 accesses the recording medium 99. In step 609, the system control circuit 50 acquires the power consumption when the storage apparatus 101 accesses the recording medium 17 and the power consumption when the image reproducing apparatus 100 and the storage apparatus 101 communicate with each other.

  FIG. 7 is a diagram showing a table for explaining in detail the various state determination processing in step 511 of FIG. As will be described later, the system control circuit 50 performs state determination processing based on information on the battery state of the image playback device, the communication radio wave state, the battery state of the storage device, the power consumption by media access, and the power consumption by communication.

  First, various state determination processing when the user selects image data in the image playback device 100 will be described using the table shown in FIG.

  For example, a case where the battery state of the image playback device 100 is Full and the battery state of the storage device 101 is Full will be described. The system control circuit 50 deletes the least frequently used image data from the cache memory, and adds the image data in the selected image reproduction device 100 to the cache memory.

  Next, a case where the battery state of the image playback device 100 is Full and the battery state of the storage device 101 is Half will be described. If the image data of the image playback device 100 exists in the cache memory, the image data of the image playback device 100 that is least frequently used is deleted from the cache memory, and the image data in the selected image playback device 100 is added to the cache memory. . On the other hand, if the image data of the image playback device 100 does not exist in the cache memory, the image data of the storage device 101 that is least frequently used is deleted from the cache memory, and the image data in the selected image playback device 100 is transferred to the cache memory. to add.

  Next, a case where the battery state of the image playback device 100 is Full and the battery state of the storage device 101 is Low will be described. If the image data of the image playback device 100 exists in the cache memory, the image data of the image playback device 100 that is least frequently used is deleted from the cache memory, and the image data in the selected image playback device 100 is added to the cache memory. . On the other hand, if there is no image data in the image playback device 100 in the cache memory, no image data is added to the cache memory.

  Next, a case where the battery state of the image playback device 100 is Half and the battery state of the storage device 101 is High will be described. If the image data of the storage apparatus 101 exists in the cache memory, the image data of the storage apparatus 101 that is least frequently used is deleted from the cache memory. Then, the image data in the selected image reproduction device 100 and the image data of the image reproduction device 100 before and after the selected image data are added to the cache. On the other hand, if the image in the storage apparatus 101 does not exist in the cache memory, the image data that is least frequently used is deleted from the cache memory. Then, the image data in the selected image reproduction device 100 and the image data in the image reproduction device 100 before and after the selected image data are added to the cache memory.

  Next, a case where the battery state of the image playback device 100 is Half and the battery state of the storage device 101 is Half will be described. First, in this case, a case will be described in which the amount of power consumption in communication between the image playback device 100 and the storage device 101 and in the media access in the storage device 101 is smaller than the media access in the image playback device 100. If the image data of the storage apparatus 101 exists in the cache memory, the image data of the storage apparatus 101 that is least frequently used is deleted. Then, the image data in the selected image reproduction device 100 and the image data in the image reproduction device 100 before and after the selected image data are added to the cache memory. On the other hand, if there is no image data of the storage device 101 in the cache memory, the image data of the image playback device 100 that is least frequently used is deleted. Then, the image data in the selected image reproduction device 100 and the image data in the image reproduction device 100 before and after the selected image data are added to the cache memory.

  Similarly, a case where the battery state of the image playback device 100 is Half and the battery state of the storage device 101 is Half will be described. In this case, a case will be described in which the amount of power consumption in the communication between the image playback device 100 and the storage device 101 and the media access in the storage device 101 is greater than the media access in the image playback device 100. If the image data of the image reproducing device 100 exists in the cache memory, the image data of the image reproducing device 100 that is least frequently used is deleted. Then, the selected image data in the image playback device 100 is added to the cache memory. On the other hand, if there is no image data of the image playback device 100 in the cache memory, the image data in the storage device 101 that is least frequently used is deleted. Then, the selected image data in the image playback device 100 is added to the cache memory.

  Next, a case where the battery state of the image playback device 100 is Half and the battery state of the storage device 101 is Low will be described. If the image data of the image reproduction device 100 exists in the cache memory, the image data of the image reproduction device 100 that is least frequently used is deleted from the cache memory. Then, the selected image data in the image playback device 100 is added to the cache memory. If the image data of the image playback device 100 does not exist in the cache memory, the selected image data in the image playback device 100 is not added to the cache memory.

  Next, a case where the battery state of the image playback apparatus 100 is Low and the battery state of the storage apparatus 101 is High will be described. If the image data of the storage device 101 exists in the cache memory, the image data of the storage device 101 that is least frequently used is deleted, and the image data in the selected image reproduction device 100 is added to the cache memory. On the other hand, if there is no image data of the storage device 101 in the cache memory, the image data of the image playback device 100 that is least frequently used is deleted. Then, the selected image data in the image playback device 100 is added to the cache memory.

  Next, a case where the battery state of the image playback device 100 is Low and the battery state of the storage device 101 is Half will be described. If the image data of the storage device 101 exists in the cache memory, the image data of the storage device 101 that is least frequently used is deleted, and the image data in the selected image reproduction device 100 is added to the cache memory. On the other hand, if there is no image data of the storage device 101 in the cache memory, the image data of the image playback device 100 that is least frequently used is deleted. Then, the selected image data in the image playback device 100 is added to the cache memory.

  Next, a case where the battery state of the image playback apparatus 100 is Low and the battery state of the storage apparatus 101 is Low will be described. In this case, the least frequently used image data is deleted from the cache memory, and the selected image data in the image playback device 100 is added to the cache memory.

  Next, various state determination processing when the user selects image data in the storage apparatus 101 will be described using the table shown in FIG.

  First, the case where the battery state of the storage apparatus 101 is Full and the battery state of the image playback apparatus 100 is Full will be described. In this case, the least frequently used image data is deleted from the cache memory. The image data in the selected storage device 101 is added to the cache memory.

  Next, a case where the battery state of the storage apparatus 101 is Full and the battery state of the image playback apparatus 100 is Half will be described. If the image data of the storage apparatus 101 exists in the cache memory, the image data of the storage apparatus 101 that is least frequently used is deleted from the cache memory. Then, the image data in the selected storage device 101 is added to the cache memory. On the other hand, if the image data of the storage device 101 does not exist in the cache memory, the image data of the image reproduction device 100 that is least frequently used is deleted from the cache memory. Then, the image data in the selected storage device 101 is added to the cache memory.

  Next, a case where the battery state of the storage apparatus 101 is Full and the battery state of the image playback apparatus 100 is Low will be described. If the image data of the storage apparatus 101 exists in the cache memory, the image data of the storage apparatus 101 that is least frequently used is deleted from the cache memory. Then, the image data in the selected storage device 101 is added to the cache memory. If the image data of the storage device 101 does not exist in the cache memory, the image data in the selected storage device 101 is not added to the cache memory.

  Next, a case will be described in which the battery state of the storage apparatus 101 is Half and the battery state of the image playback apparatus 100 is High. If the image data of the image reproduction device 100 exists in the cache memory, the image data of the image reproduction device 100 that is least frequently used is deleted from the cache memory. Then, the image data in the selected storage device 101 and the image data in the storage device 101 before and after the selected image data are added to the cache. On the other hand, if the image data of the image playback device 100 does not exist in the cache memory, the image data that is least frequently used is deleted from the cache memory. Then, the image data in the selected storage device 101 and the image data in the storage device 101 before and after the selected image data are added to the cache memory.

  Next, a case will be described in which the storage apparatus 101 has a battery state of Half and the image playback apparatus 100 has a battery state of Half. First, in this case, a case will be described in which the amount of power consumption in communication between the image playback device 100 and the storage device 101 and in the media access in the storage device 101 is smaller than the media access in the image playback device 100. If the image data of the storage apparatus 101 exists in the cache memory, the image data of the storage apparatus 101 that is least frequently used is deleted. Then, the image data in the selected storage device 101 is added to the cache memory. On the other hand, if there is no image data of the storage device 101 in the cache memory, the image data of the image playback device 100 that is least frequently used is deleted. Then, the image data in the selected storage device 101 is added to the cache memory.

  Similarly, a case where the battery state of the storage apparatus 101 is Half and the battery state of the image playback apparatus 100 is Half will be described. In this case, a case will be described in which the amount of power consumption in the communication between the image playback device 100 and the storage device 101 and the media access in the storage device 101 is greater than the media access in the image playback device 100. If the image data of the image reproducing device 100 exists in the cache memory, the image data of the image reproducing device 100 that is least frequently used is deleted. Then, the image data in the selected storage device 100 and the image data in the storage device 101 before and after the selected image data are added to the cache memory. On the other hand, if there is no image data of the image playback device 100 in the cache memory, the image data of the storage device 101 that is least frequently used is deleted. Then, the image data in the selected storage device 100 and the image data in the storage device 101 before and after the selected image data are added to the cache memory.

  Next, a case where the storage apparatus 101 has a battery state of Half and the image playback apparatus 100 has a battery state of Low will be described. If the image data of the storage apparatus 101 exists in the cache memory, the image data of the storage apparatus 101 that is least frequently used is deleted from the cache memory. Then, the image data of the selected storage device 101 is added to the cache memory. If the image data of the storage device 101 does not exist in the cache memory, the image data in the selected storage device 101 is not added to the cache memory.

  Next, the case where the battery state of the storage apparatus 101 is Low and the battery state of the image playback apparatus 100 is High will be described. If the image data of the image playback device 100 exists in the cache memory, the image data of the image playback device 100 that is least frequently used is deleted, and the image data in the selected storage device 101 is added to the cache. On the other hand, if there is no image data of the image playback device 100 in the cache memory, the image data of the storage device 101 that is least frequently used is deleted. Then, the image data in the selected storage device 101 is added to the cache memory.

  Next, the case where the battery state of the storage apparatus 101 is Low and the battery state of the image playback apparatus 100 is Half will be described. If the image data of the image reproducing device 100 exists in the cache memory, the image data of the image reproducing device 100 that is least frequently used is deleted. Then, the image data in the selected storage device 101 is added to the cache memory. On the other hand, if there is no image data of the image playback device 100 in the cache memory, the image data of the storage device 101 that is least frequently used is deleted. Then, the image data in the selected storage device 101 is added to the cache memory.

  Next, a case where the battery state of the storage apparatus 101 is Low and the battery state of the image playback apparatus 100 is Low will be described. In this case, the least frequently used image data is deleted from the cache memory, and the image data in the selected storage device 101 is added to the cache memory.

  Although not shown, the type of image data to be acquired is changed according to the radio wave condition. When the communication state is good, main body image data is acquired. If the communication state is poor, thumbnails or resized image data are acquired.

Further, the processing content is changed depending on the remaining battery time. For example, the image playback device 100
Even if the battery state of the storage device 101 is Full and the battery state of the storage device 101 is Full, the remaining battery time of the image playback device 100 is twice the remaining battery time of the storage device 101 as an example. In this example, the combination of the battery state Full of the image playback device 100 and the battery state Half of the storage device 101 may be performed.

  Furthermore, the processing content can be changed according to the characteristics of the device such as the power consumption by the communication processing and the power consumption by the media access.

  FIG. 8 is a flowchart showing in detail the process of adding the image data in step 513 of FIG. 5 to the cache memory.

  In step 801, the system control circuit 50 determines whether to add image data to the cache memory. When image data is not added to the cache memory, the process proceeds to step 803 to acquire image data. When adding image data to the cache memory, the process proceeds to step 805.

  In step 805, the system control circuit 50 acquires the image size. In step 807, image data to be evicted (deleted) from the cache memory is searched. As a result of the search, if the corresponding image data does not exist in the cache memory, the process proceeds to step 803. On the other hand, if the corresponding image data exists in the cache memory, the process advances to step 809 to calculate the total size of the image data to be expelled.

  In step 811, the system control circuit 50 compares the size of image data to be added to the cache memory with the cumulative size of image data to be expelled from the cache memory. As a result, if the size of the image data to be added to the cache memory is larger, the processing from step 807 is repeated. On the other hand, if the size of the image data to be added to the cache memory is smaller, the process proceeds to step 813. In step 813, the system control circuit 50 drives out the image data from the cache memory. In step 815, the system control circuit 50 acquires image data, and in step 817, adds the acquired image data to the cache memory.

  FIG. 9 is a flowchart showing in detail the cache memory control process in step 331 of FIG. Step 509 is already described with reference to FIG.

  In step 900, the system control circuit 50 determines the processing contents from various information. In step 901, the system control circuit 50 determines the type of image data to be deleted from the cache memory. In the case of image data stored in the storage apparatus 101, the process proceeds to step 905. In the case of image data from the image playback device 100, the process proceeds to step 903. Otherwise, the process ends.

  In step 903, the system control apparatus 50 deletes the image data of the image reproducing apparatus 100 from the cache memory, and the process proceeds to step 907. In step 905, the system control apparatus 50 deletes the image data of the storage apparatus 101 from the cache memory, and proceeds to step 907.

  In step 907, the system control circuit 50 determines the type of image data to be added to the cache memory. In the case of main body image data in the storage apparatus 101, the process proceeds to step 909, and the system control circuit 50 acquires the main body image data in the storage apparatus 101 and adds it to the cache memory.

  In the case of thumbnail image data in the storage apparatus 101, the process proceeds to step 911, and the system control circuit 50 acquires the thumbnail image data in the storage apparatus 101 and adds it to the cache memory.

  In the case of main body image data in the image playback device 100, the process proceeds to step 913, and the system control circuit 50 acquires the main body image data in the image playback device 100 and adds it to the cache memory.

  In the case of the thumbnail image data in the image playback device 100, the process proceeds to step 915, where the thumbnail image data in the image playback device 100 is acquired and added to the cache memory.

  FIG. 21 is a diagram showing a table for explaining in detail the various state determination processing in step 900 of FIG.

  First, a case where the battery state of the image playback apparatus 100 is Full and the battery state of the storage apparatus 101 is Half will be described. In this case, the image data of the image playback device 100 is deleted from the cache memory, and the image data in the storage device 101 with the highest use frequency and the image data before and after that are added to the cache memory.

  Next, when the battery state of the image playback device 100 is Full and the battery state of the storage device 101 is Low, the image data of the image playback device 100 is deleted from the cache memory.

  Next, a case where the battery state of the image playback device 100 is Half and the battery state of the storage device 101 is Full will be described. In this case, the image data of the storage device 101 is deleted from the cache memory, and the image data in the image reproduction device 100 with the highest use frequency and the image data before and after that are added to the cache memory.

  Next, a case where the battery state of the image playback device 100 is Half and the battery state of the storage device 101 is Half will be described. First, in this case, a case will be described in which the communication between the image playback device 100 and the storage device 101 and the media access in the storage device 101 consume less power than the media access in the image playback device 100. The image data in the storage device 101 is deleted from the cache memory, and the image data in the image reproduction device 100 with the highest use frequency and the image data before and after the image data are added to the cache memory.

  Similarly, the case where the battery state of the image playback apparatus is Half and the battery state of the storage apparatus 101 is Half will be described. Here, in this case, a case will be described in which the communication between the image playback device 100 and the storage device 101 and the media access in the storage device 101 consume more power than the media access in the image playback device 100. The image data in the image playback device 100 is deleted from the cache memory. Further, the image data in the storage device 101 with the highest use frequency and the image data before and after the image data are added to the cache memory.

  FIG. 10 is a flowchart showing image data deletion processing from the cache memory in steps 903 and 905 of FIG.

  In step 1001, the system control circuit 50 selects image data that is least frequently used in the cache memory. In step 1003, the system control circuit 50 acquires image information of the image data. In step 1005, the system control circuit 50 determines whether the image information of the image data to be deleted matches the image information of the selected image data in the cache memory.

  When the image data of the image playback device 100 is to be deleted, it is determined whether the selected image data in the cache memory is the image data of the image playback device 100. On the other hand, when the image data of the storage device 101 is to be deleted, it is determined whether the selected image data in the cache memory is the image data of the storage device 101. For example, here, when the image information of the image data to be deleted matches the image information of the selected image data in the cache memory in step 1005, the process proceeds to step 1009, and the system control circuit 50 stores the information in the cache memory. Delete the image data.

  On the other hand, if the image information of the image data to be deleted does not match the image information of the selected image data in the cache memory, the process proceeds to step 1007. In 1007, the system control circuit 50 confirms whether all the image data in the cache memory has been checked. If checked, the process is terminated. If not checked, the processing from step 1003 is repeated. Although not shown here, the control may be switched not to check all the image data but to check only a certain number of images.

  FIG. 11 is a flowchart showing in detail the cache memory addition processing for image data in step 909, step 911, step 913, and step 915 in FIG.

  In step 1101, the system control circuit 50 selects image data to be added to the cache memory. In step 1103, the system control circuit 50 acquires image information of the image data. In step 1105, the system control circuit 50 secures a cache memory area for the image size. In step 1107, the system control circuit 50 determines whether a cache memory area has been secured. If it cannot be secured, the process ends. If it can be secured, the system control circuit 50 acquires the image data in step 1109, adds the image data to the cache memory in step 1111, and repeats the processing in step 1101.

  FIG. 12 is a structural diagram of cache memory data. FIG. 12A is a diagram illustrating an outline of image information, and FIG. 12B is a diagram illustrating an overall configuration of cache memory data. The cache memory manages image data in a bidirectional list. Each list includes image information related to image data and image data. The top of the list is the most frequently used and the bottom of the list is the least frequently used. The image information related to the image data includes the media in which the image data is stored, the type of image data, the image size, the file name, and the like.

  There are recording media in the image playback apparatus 100 and recording media in the storage apparatus 101 as media storing the image data. The image type includes a main body / thumbnail.

  Use list operation to change usage frequency / add / delete image data. When storing image data, information on the image size is read to secure an area. When deleting image data, the area is released.

  When the battery status of the storage apparatus 101 is Half and the battery status of the image playback apparatus 100 is Full, the image data in the storage apparatus 101 is preferentially added to the cache memory.

  FIG. 13 is a diagram showing a user interface between the image playback device 100 and the storage device 101.

  Using the display unit 54 provided in the image reproduction device 100, the user is notified of the access status to the image data. When image data is selected, a red LED is displayed when the image data is displayed from the cache memory. When the image data of the storage device existing in the cache memory is displayed and not connected to the storage device, a yellow LED is displayed. When image data is acquired from a recording medium (internal medium 99) in the image reproducing apparatus, it is displayed in green. When image data is acquired from a recording medium (large capacity recording medium 17) in the storage device, it is displayed in blue. When image data is being accessed, it blinks in each color.

  On the other hand, the color of the display on the display unit 16 provided in the storage apparatus 101 is changed depending on the battery status of the image reproduction apparatus 100 and the storage apparatus 101. When the battery state of the image playback device 100 is Low, it is displayed in yellow. When the battery status of the storage apparatus 101 is Low, it is displayed in green. When both devices are Low, they are displayed in yellowish green.

  As described above, it is possible to control the cache memory control method and the type of image data stored in the cache memory from the battery state, the communication state, the media access and the power consumption by the communication of the image playback device 100 and the storage device 101. . As a result, the power consumption of the image playback device 100 and the storage device 101 can be suppressed as much as possible, and image data can be played back at high speed.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. Note that the same step number is assigned to a step that performs the same processing as in the first embodiment.

  In the first embodiment, cache memory control is performed in a one-to-one communication mode between an image reproduction device and a storage device. On the other hand, in the present embodiment, cache memory control is performed in a communication mode between one image playback device and a plurality of storage devices, which is a difference between the first embodiment and this embodiment.

  FIG. 14 is a diagram illustrating a configuration example of an image reproduction system according to the second embodiment of the present invention. As shown in FIG. 14, in the present embodiment, a plurality of storage apparatuses 101 and one image playback apparatus 100 are connected.

  FIG. 15 is an SDL diagram showing an image reproduction process in the image reproduction apparatus 100 according to the first embodiment. 3 is different from FIG. 3 only in cache memory allocation-related processing, and the other processing is the same as FIG. Therefore, the description of step 347 from the state corresponding to that portion (step 301) is omitted.

  In step 1601, the system control circuit 50 performs connection with each storage apparatus 101. In step 1603, the system control circuit 50 allocates a cache memory area for the image playback device 100 and each storage device 101 that can be connected.

  In the image reproduction state (step 315), the system control circuit 50 receives a battery state change notification (step 325) of the image reproduction apparatus 100. In step 1605, the system control circuit 50 controls allocation of a cache memory area to the image playback device 100 and each storage device 101 that can be connected.

  In the image reproduction state (step 315), the system control circuit 50 receives a battery state change notification (step 333) of the remote storage apparatus 101. In step 1605, the system control circuit 50 controls allocation of a cache memory area to the image playback device 100 and each storage device 101 that can be connected.

  FIG. 16 is a flowchart showing the cache memory area allocation initialization process for each storage apparatus 101 in step 1601 of FIG.

  In step 1701, the system control circuit 50 calculates a cache memory area to be allocated to each device. In step 1703, the system control circuit 50 secures a cache memory area for all the storage apparatuses 101.

  FIG. 17 is a flowchart showing the cache memory area calculation process assigned to each storage apparatus 101 in step 1701 of FIG.

  In step 1801, the system control circuit 50 acquires the number of connections of the storage apparatus 101. In step 1803, the system control circuit 50 acquires a cache memory area. In step 1805, the system control circuit 50 calculates the number of AC power supply driving devices among all the storage apparatuses 101. In step 1807, the system control circuit 50 calculates the number of devices in the Low Battery state among all the storage apparatuses 101. In step 1809, the system control circuit 50 calculates the number of devices in the Full Battery state among all the storage apparatuses 101.

  In step 1811, the system control circuit 50 calculates a cache memory area to be allocated to each device according to each power supply state. For example, assume that the allocation rate of the cache memory area of the LowBattery device is 1. Assume that the allocation rate of the cache memory area of the Full Battery device is 0.5. Assume that the allocation rate of the cache memory area of the AC power supply device is 0.25.

  For example, a case of a system configuration in which the cache memory area is 100 MByte, three devices in the Low Battery state, two devices in the Full Battery state, and four AC power supply devices are described as an example. In this example, the cache memory area allocated to the device in the Low Battery state is 100M / 3 * 1 + 0.5 * 2 + 0.25 * 4 = 25M. The cache memory area allocated to the Full Battery state device is 25M * 0.5 = 12.5M. The cache memory area allocated to the AC power supply device is 25M * 0.25 = 6.25M.

  FIG. 18 is a flowchart showing in detail the cache memory allocation control process for each storage apparatus 101 in step 1605 of FIG.

  In step 1701, the system control circuit 50 calculates a cache memory area to be allocated to each storage apparatus 101. In step 1901, the system control circuit 50 releases the cache memory area. In step 1903, the system control circuit 50 determines whether cache memory area release processing has been performed for all storage apparatuses 101. If the release process has not been performed, the process from step 1901 is repeated. If the release process has been performed, the process proceeds to step 1905.

  In step 1905, the system control circuit 50 secures a cache memory area. In step 1907, the system control circuit 50 determines whether cache memory area reservation processing has been performed for all storage apparatuses 101. If the securing process is not performed, the process from step 1905 is repeated. If the securing process has been performed, the process ends.

  FIG. 19 is a flowchart showing in detail the cache memory release process in step 1901 of FIG.

  In step 2001, the system control circuit 50 determines whether or not the cache memory area size has decreased. If not decreased, the process is terminated. If it has decreased, the process proceeds to step 2003. In step 2003, the system control circuit 50 deletes image data that is least frequently used. In step 2005, the system control circuit 50 compares the cache memory release size with the image size. If the cache memory release size is smaller than the image size, the process proceeds to step 2007. On the other hand, if the cache memory release size is larger than the image size, the process proceeds to step 2009.

  In step 2007, the system control circuit 50 releases a cache memory area corresponding to the cache memory release size. In step 2009, the system control circuit 50 releases a cache memory area for the image size. In step 2011, the system control circuit 50 divides the image size from the cache memory open size, and repeats the processing from step 2003.

  FIG. 20 is a flowchart showing in detail the cache memory allocation control process for each storage apparatus 101 in step 1905 of FIG.

  In step 2101, the system control circuit 50 determines whether or not the cache memory area increases. If the cache memory area does not increase, the process ends. If the cache memory area increases, the process proceeds to step 2103. In step 2103, the system control circuit 50 secures an area for an increase in the cache memory area.

  As described above, in a system configuration in which a plurality of storage devices are connected, the type of image data stored in the cache memory is controlled from the battery state, communication state, media access and power consumption of the image playback device and storage device. ing. Thereby, it is possible to suppress the power consumption of the image reproducing device and the storage device as much as possible and to reproduce the image at high speed.

  Another object of the present invention is to supply a storage medium storing software program codes for realizing the functions of the above-described embodiments to a system or apparatus, and a computer such as the system reads and executes the program codes from the storage medium. Is also achieved.

  In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the program code itself and the storage medium storing the program code constitute the present invention.

  As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

  In addition, the case where the functions of the above-described embodiment are realized by performing part or all of the actual processing by an OS or the like running on the computer based on the instruction of the program code read by the computer. It is.

  Further, after the program code read from the storage medium is written in a memory provided in a function expansion unit connected to the computer, the CPU or the like performs actual processing based on the instruction of the program code, and the above-described processing is performed. The case where the functions of the embodiment are realized is also included.

It is a figure which shows the example of 1 structure of the image reproduction apparatus system in the 1st Embodiment of this invention. FIG. 2 is a block diagram of the image playback device system shown in FIG. 1. It is a SDL figure which shows the image reproduction display process in an image reproduction apparatus. It is a SDL figure which shows the image reproduction display process in a storage apparatus. It is a flowchart which shows the image acquisition process of step 321 of FIG. 3 in detail. It is a flowchart which shows the various information acquisition process of step 509 of FIG. 5 in detail. It is a figure for demonstrating the various information discrimination | determination processing of step 511 of FIG. It is a figure for demonstrating the various information discrimination | determination processing of step 511 of FIG. 6 is a flowchart showing in detail processing for adding an image in step 513 of FIG. 5 to a cache memory. 4 is a flowchart showing in detail a cache memory control process in step 331 of FIG. 3. 10 is a flowchart illustrating in detail image deletion processing from the cache memory in step 903 and step 905 in FIG. 9. 10 is a flowchart showing in detail an image cache memory addition process in steps 909, 911, 913, and 915 of FIG. It is a figure which shows the structure of cache memory data. It is a figure which shows the user interface of an image reproduction apparatus system. It is a figure which shows the example of 1 structure of the image reproduction apparatus system in the 2nd Embodiment of this invention. It is a SDL figure which shows the image reproduction process in the image reproduction apparatus in the 2nd Embodiment of this invention. 16 is a flowchart showing cache memory area allocation initialization processing for each device in step 1601 of FIG. 15. It is a flowchart which shows the cache memory area | region calculation process allocated to each apparatus of step 1701 of FIG. 16 is a flowchart showing in detail cache memory allocation control processing for each device in step 1605 of FIG. 15. FIG. 19 is a flowchart showing in detail a cache memory release process in step 1901 of FIG. 18. FIG. FIG. 19 is a flowchart showing in detail a cache memory allocation control process for each device in step 1905 of FIG. 18. FIG. It is a figure for demonstrating in detail the various information discrimination | determination processes of step 900 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power supply control circuit 11 Power supply device 12 System control circuit 13 Main switch 14 System memory 15 Non-volatile memory 16 Display part 17 Recording medium 18 Interface for recording media 19 Memory 20 Communication circuit 22 Memory control circuit 24 Image display memory 26 D / A conversion Device 28 Image display unit 30 Memory 32 Compression / decompression circuit 33 Communication circuit 50 System control circuit 52 System memory 54 Display unit 56 Non-volatile memory 60 Main switch 70 Operation unit 80 Power supply control circuit 86 Power supply device 90 Recording medium interface 99 Recording medium 100 image playback device 101 storage device

Claims (15)

A storage device having a recording unit for recording image data and a communication unit that can be connected to an external device, a storage device capable of grasping a power supply state, a connection unit for a recording medium for recording image data, and a communication with the storage device A cache memory for temporarily storing image data recorded in at least one of the communication means, the recording means and the recording medium; and the image display means for displaying the image data recorded in the cache memory. In an image reproduction system comprising display control means, and including an image reproduction device capable of grasping a power state between the storage device and the image reproduction device and a communication state between the storage device and the image reproduction device,
The image playback device controls switching between image data to be deleted from the cache memory and image data to be added to the cache memory according to the power state of the storage device, the power state of the image playback device, and the communication state. An image reproduction system characterized by comprising means.   The image reproduction system according to claim 1, wherein the power state has a plurality of states and represents a remaining capacity of a battery as a power source.   The control means preferentially deletes the image data of the device having the good power state out of the storage device and the image reproduction device from the cache memory, and preferentially takes the image data of the device having the bad power state. 3. The image reproduction system according to claim 1, wherein the image reproduction system is added to a cache memory.   The control means includes image data to be deleted from the cache memory and the cache memory in accordance with power consumption by access processing to the recording means and the recording medium and communication processing between the storage device and the image reproduction device. 4. The image reproduction system according to claim 1, wherein the image data to be added is switched.   When the communication state is worse than a predetermined state, the communication unit receives small-size image data from the storage device, and the control unit adds the small-size image data to the cache memory. The image reproduction system according to claim 1, wherein the image reproduction system is an image reproduction system.   The control unit adds image data to be displayed by the image display unit and image data existing before and after the image data from the recording unit or the recording medium to the cache memory according to the power state. Item 6. The image reproduction system according to any one of Items 1 to 5. A control method for an image playback device capable of communicating with a storage device capable of grasping a power state, comprising a recording means for recording image data and a communication means connectable to an external device,
A detection step of detecting a power supply state between the storage device and the image reproduction device, and a communication state between the storage device and the image reproduction device;
Temporarily storing image data recorded on at least one of the recording medium for recording image data and the recording unit according to the power supply state of the storage device, the power supply state of the image reproduction device, and the communication state A control step of switching between image data to be deleted from the cache memory to be recorded and image data to be added to the cache memory;
A display control step of causing the image display means to display the image data recorded in the cache memory.   The method according to claim 7, wherein the power state has a plurality of states and represents a remaining capacity of a battery as a power source.   The control step preferentially deletes the image data of the device having a good power state out of the storage device and the image reproduction device from the cache memory, and gives priority to the image data of the device having a bad power state. 9. The method for controlling an image reproducing apparatus according to claim 7, wherein the image reproducing apparatus is added to a cache memory.   The control step includes: image data to be deleted from the cache memory and the cache memory in accordance with power consumption due to access processing to the recording unit and the recording medium and communication processing between the storage device and the image reproduction device. 10. The method for controlling an image reproducing apparatus according to claim 7, wherein the image data to be added to the image data is switched. If the communication state is worse than a predetermined state, further comprising a communication step of receiving small-size image data from the storage device;
The method according to claim 7, wherein the control step adds the small-size image data to the cache memory.   The control step adds image data displayed by the image display unit and image data existing before and after the image data from the recording unit or the recording medium to the cache memory according to the power state. 12. A method for controlling an image reproduction device according to claim 7.   A program for causing a computer to execute the control method of the image reproduction device according to any one of claims 7 to 12.   A computer-readable recording medium on which the program according to claim 13 is recorded. An image reproduction device capable of communicating with a storage device capable of grasping a power state, comprising a recording means for recording image data and a communication means connectable to an external device,
Detecting means for detecting a power supply state between the storage device and the image reproduction device, and a communication state between the storage device and the image reproduction device;
Temporarily storing image data recorded on at least one of the recording medium for recording image data and the recording unit according to the power supply state of the storage device, the power supply state of the image reproduction device, and the communication state Control means for switching between image data to be deleted from the cache memory to be recorded and image data to be added to the cache memory;
An image reproduction apparatus comprising: display control means for causing the image display means to display the image data recorded in the cache memory.

Images