JP2008245018A - Image display device, printer and image cache method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance cache operation of an image to be displayed on a display device. <P>SOLUTION: When the selection of first image data to be displayed on a liquid crystal monitor is accepted, a main processor inputs the selected image data from a memory card. A cache processor caches the image data input by the main processor into a shared memory. When the selection of second image data is accepted from a user while the cache processor performs cache processing, the main processor takes over and executes the cache processing of the first image data from the cache processor. During the execution, the cache processor caches the newly selected second image data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for caching an image to be displayed.

  2. Description of the Related Art Multi-function printers that have become popular in recent years include various devices such as scanners, memory card readers, and display devices. An image read from the memory card is displayed on the display device. The user can arbitrarily select an image desired to be printed from images displayed on the display device (see, for example, Patent Document 1).

JP 2005-111843 A

  In general, the access speed of a memory card is not as fast as the internal memory. Therefore, if an image to be displayed on the display device is read from the memory card every time the user switches the image, it takes time for the input processing and decoding processing, and the operation speed becomes slow. Therefore, it is conceivable to adopt a method of caching an image once input from a memory card in an internal memory. By adopting such a method, the printing apparatus can use the image cached in the internal memory when redisplaying the same image, so that the display time can be greatly shortened.

  However, in such a printing apparatus, when a display image is switched while an uncached image is read from the memory card and cached in the internal memory, the cache processing of the image before the switching is terminated halfway. Will end up. Then, when redisplaying the same image, the cached data may not be normally used.

  In view of these problems, the problem to be solved by the present invention is to improve the cache operation of an image displayed on a display device.

  Based on the above problems, an image display device which is one embodiment of the present invention is configured as follows.

  That is, an image display device that displays image data on a display device, a reception unit that receives selection of image data to be displayed on the display device from a plurality of image data recorded on a predetermined recording medium, and the selection A cache unit that reads the recorded image data from the recording medium and caches the image data in a memory, and the reception unit selects another image data during the cache process of one image data by the cache unit. A transfer processing unit that, when accepted, interrupts the cache processing of the one image data by the cache unit and takes over the interrupted cache processing of the one image data from the cache unit; Is the gist.

  According to the image display device having the above configuration, even when the user selects other image data while the previously selected image data is cached in the memory, the transfer processing unit selects the image data first. The cache processing of the processed image data can be taken over and executed. Therefore, the cache unit can immediately start the cache processing of the image data selected later. As a result, both the previously selected image data and the later selected image data can be normally cached in the memory.

  In the image display device having the above-described configuration, the image data cached in the memory is referred to, an image analysis unit that performs an analysis process on the image data, and the image data according to a result of the analysis process. An image quality adjustment unit that adjusts image quality may be provided.

  With such a configuration, it is possible to analyze the image using the image data cached in the memory and improve the image quality of the image data according to the analysis result. Further, since image data cached in a memory is used for image analysis, analysis processing can be performed at high speed.

  In the image display device having the above-described configuration, when the reception unit receives the selection of the other image data during the cache processing of the one image data by the cache unit, the transfer is performed. The analysis process for the other image data may be performed after the analysis process for the one image data cached by the processing unit.

  With such a configuration, it is possible to perform cache processing and image analysis on all of the image data displayed on the display device.

  In the image display device having the above configuration, the cache unit may execute the cache process after reducing the resolution of the selected image data to a resolution set in accordance with the resolution of the display device. Good.

  With such a configuration, the capacity of image data to be cached can be reduced, so that the memory capacity can be saved.

  In the image display device having the above configuration, the cache unit is realized by one processor executing a predetermined control program, and the takeover processing unit is realized by another processor executing a predetermined control program. It is good also as a thing.

  With such a configuration, cache processing and takeover processing can be efficiently performed by sharing the processing by a plurality of processors.

  In the image display device having the above configuration, when the selected image data is cached in the memory, the selected image data is input from the memory, displayed on the display device, and cached in the memory. If not, a display control unit that inputs the selected image data from the recording medium and displays the selected image data on the display device may be provided.

With such a configuration, it is possible to display an image at high speed using image data cached in the memory.

  The present invention provides an image display device having any one of the above-described configurations, a setting unit for setting the number of prints for image data displayed on the display device, and an image in which the number of prints is set to one or more. It can also be configured as a printing apparatus including a printing unit that prints data. According to the present invention, it is possible to easily select an image desired to be printed while viewing an image displayed on a display device.

  Note that the present invention can be configured as an image cache method and a computer program in addition to the above-described configuration as the image display device and the printing device. Such a computer program may be recorded on a computer-readable recording medium. As the recording medium, for example, various media such as a flexible disk, a CD-ROM, a DVD-ROM, a magneto-optical disk, a memory card, and a hard disk can be used.

Hereinafter, in order to further clarify the operations and effects of the present invention described above, embodiments of the present invention will be described based on examples in the following order.
A. Configuration of printing device:
B. Printing process:
C. Processing of each processor when there is no interrupt operation:
D. Processing of each processor when an interrupt operation is performed:

A. Configuration of printing device:
FIG. 1 is an external view of a printing apparatus 10 as an embodiment of the present invention. The printing apparatus 10 includes a scanner 20 that optically reads an image and a memory card slot 30 into which a memory card MC is inserted. The printing apparatus 10 can print the image captured by the scanner 20 or the image read from the memory card MC on the printing paper P.

  The printing apparatus 10 includes an operation panel 40 and a liquid crystal monitor 50. The operation panel 40 includes an image switching button 41, a print number setting button 43, and a print button 44. The liquid crystal monitor 50 displays an image input from the memory card MC. The user can switch the image to be displayed on the liquid crystal monitor 50 using the image switching button 41. At this time, the user can set the number of prints using the print number setting button 43 for each displayed image. When the setting of the number of prints is completed and the user presses the print button 44, the printing apparatus 10 prints the designated number of images on the printing paper P by the designated number.

  FIG. 2 is a block diagram illustrating an internal configuration of the printing apparatus 10. As illustrated, the printing apparatus 10 includes a main processor 100 and a plurality of sub-processors 200a to 200e (an intermediate control processor 200a, a decode processor 200b, a cache processor 200c, an image quality adjustment processor 200d, and a halftone processor 200e). These processors are configured as a multiprocessor including a plurality of CPU cores in one semiconductor package. These processors are connected to each other via a predetermined bus, and can exchange various data and commands with each other. As a bus connecting the processors, for example, a ring bus can be employed.

  The main processor 100 and the sub processors 200a to 200e are connected to the same shared memory 70 via a memory controller (not shown). Therefore, the processors can jointly use the data in the shared memory 70 without transferring data to each other. As the shared memory 70, for example, a DDR-SDRAM can be used.

  A card interface 35, a liquid crystal controller 55, an input interface 45, a scanner control circuit 25, a printing mechanism 60, and a ROM 80 are connected to the main processor 100.

  The card interface 35 is a circuit that controls reading and writing of data with respect to the memory card MC inserted into the memory card slot 30 in accordance with an instruction from the main processor 100.

  The liquid crystal controller 55 is a circuit that controls the liquid crystal monitor 50 to control display of an image instructed from the main processor 100. The liquid crystal monitor 50 of this embodiment has a resolution of QVGA (320 × 240 dots). Of course, a liquid crystal monitor 50 having another resolution may be adopted.

  The input interface 45 is a circuit for receiving an input operation from a user using the operation panel 40 and transmitting the input operation to the main processor 100.

  The scanner control circuit 25 is a circuit for controlling the scanner 20 and transferring the read image to the main processor 100.

  The printing mechanism 60 includes an ink discharge mechanism, a paper feed mechanism, and a head transport mechanism, and a circuit that controls these operations. The printing mechanism 60 forms an image by ejecting ink onto printing paper in response to an instruction from the main processor 100. As the printing mechanism 60, for example, an inkjet mechanism can be adopted.

  The ROM 80 stores a control program executed by the main processor 100 and the sub processors 200a to 200e. The main processor 100 reads this control program and loads it into the shared memory 70 when the printing apparatus 10 is powered on. Each processor implements various functions described below in software by executing a control program loaded in the shared memory 70.

  The main processor 100 includes a file management unit 110, a display control unit 120, an operation reception unit 130, an image analysis unit 140, a takeover processing unit 150, and a print control unit 160 as functional units implemented as software. It has.

  The file management unit 110 controls the card interface 35 to manage image data input / output with respect to the memory card MC. Image data is recorded in the memory card MC as an image file in JPEG format. The file management unit 110 manages input / output of image data to / from the memory card MC according to the file format.

  The display control unit 120 controls the liquid crystal controller 55 to display image data input from the memory card MC and a GUI (graphical user interface) related to printing on the liquid crystal monitor 50. When displaying the image data, the display control unit 120 resizes the image in accordance with the resolution of the liquid crystal monitor 50.

  FIG. 3 is an explanatory diagram showing an example in which image data and GUI are displayed on the liquid crystal monitor 50 by the display control unit 120. As shown in the figure, the image data is displayed on the entire surface of the liquid crystal monitor 50 and the number of prints is displayed in the upper right corner. Further, a description of the operation panel 40 is displayed below the image data. In the present embodiment, as shown in the description of the operation panel 40, when the right button of the image switching button 41 is pressed, the displayed image advances to the next image recorded on the memory card MC, When the left button is pressed, the image recorded on the memory card MC is restored. Such an operation by the image switching button 41 is hereinafter referred to as a “switching operation”. When the upper button of the print number setting button 43 is pressed, the number of prints of the currently displayed image increases, and when the lower button is pressed, the number of prints decreases. The number of printed sheets thus increased or decreased is displayed in the upper right part of the liquid crystal monitor 50. When the user presses the print button 44 during image display, an image with the number of prints set to one or more is printed.

  The operation accepting unit 130 accepts operations of the image switching button 41, the print number setting button 43, and the print button 44 described above.

  The image analysis unit 140 performs processing for analyzing the image input by the file management unit 110. In this analysis processing, the average luminance, minimum luminance, maximum luminance, face area, and presence / absence of a red eye of the input image are determined. This analysis process is executed during idle time when the main processor 100 is not performing other processes. The idle time is, for example, a time during which the main processor 100 requests processing from the sub processor and waits for a response, or a time when the user waits for an operation from the user. The image analysis unit 140 performs this image analysis on all the images displayed on the liquid crystal monitor 50, and stores the analysis result in the shared memory 70 in association with the file name of each image data.

  The takeover processing unit 150 performs a decoding process executed by the decoding processor 200b and a cache executed by the cache processor 200c when the user performs a display image switching operation before the display control unit 120 displays the image completely. The processing is interrupted, and these processing are executed in place of the decode processor 200b and the cache processor 200c. Hereinafter, the operation of switching the display image by the user before the image is completely displayed is referred to as “interrupt operation”. Details of processing performed by the handover processing unit 150 when an interrupt operation is performed will be described in detail later.

  The print control unit 160 controls the printing mechanism 60 to print an image whose number of prints has been set by the user.

  Here, the role of each sub-processor will be described in order. The intermediate control processor 200a manages the other sub-processors 200b to 200e and performs a process of resizing an image displayed on the liquid crystal monitor 50 by the main processor 100.

  The decode processor 200b decodes image data encoded in the JPEG format. Specifically, the decode processor 200b performs a process of converting JPEG data encoded in the frequency domain in units of 8 × 8 pixel MCUs into RGB data in units of a predetermined bandwidth composed of a plurality of lines. Do. At this time, the decode processor 200b uses a predetermined decode area in the shared memory 70 as a temporary buffer.

  The cache processor 200c performs a cache process for temporarily storing the image data decoded by the decode processor 200b in the shared memory 70. At this time, the cache processor 200c also performs a process of reducing the decoded image to a predetermined resolution (for example, VGA (640 * 480)). By doing so, the capacity of the shared memory 70 can be saved. The resolution after resizing is larger than the resolution of the liquid crystal monitor 50, and is set to a size that can appropriately perform image analysis described later. In the present embodiment, it is assumed that the shared memory 70 can cache 10 resized images. When the number of images to be cached exceeds this number, the cache processor 200c deletes the old image and caches a new image.

  The image quality adjustment processor 200d performs predetermined image processing on the print image according to the result of image analysis by the image analysis unit 140 of the main processor 100. For example, if the minimum luminance value and the maximum luminance value are analyzed by the image analysis unit 140, a process of automatically adjusting the contrast is performed based on these values. If red eyes are detected, image processing for reducing red eyes is performed. Note that the user can arbitrarily set whether or not to perform image processing by the image quality adjustment processor 200d. Further, the image quality adjustment processor 200d can perform the same image processing as the print image on the image displayed on the liquid crystal monitor 50. By doing this, it is possible to confirm in advance on the liquid crystal monitor 50 the result of printing when image processing is performed.

  The halftone processor 200e performs a halftone process for converting image data input from the memory card MC into print data. Halftone processing is processing for color-converting RGB format image data to CMY format, and further binarizing the color-converted image data to convert it into data representing dot on / off. When the printing mechanism 60 can change the size of dots formed on the printing medium into a plurality of types, the halftone processor 200e performs multi-value processing according to the size type instead of binarization.

B. Printing process:
FIG. 4 is a flowchart illustrating an outline of a printing process executed by the printing apparatus 10. This printing process is a process executed when a mode for printing an image recorded on the memory card MC is selected by a predetermined operation of the operation panel 40 by the user.

  When this process is executed, the main processor 100 first specifies an image to be displayed (step S10). Immediately after the printing process is started, the image recorded first on the memory card MC is specified as the display image.

  Next, the main processor 100 searches the shared memory 70 and determines whether the image specified in step S10 is cached in the shared memory 70 (step S15). If it is determined that it is cached (step S15: Yes), the image is input from the shared memory 70 (step S20). Then, the image is displayed on the liquid crystal monitor 50 by the display control unit 120 (step S30).

  On the other hand, when determining that the image is not cached in the shared memory 70, the main processor 100 inputs the image specified in step S10 from the memory card MC by the file management unit 110 (step S25). The image is displayed on the liquid crystal monitor 50 (step S30). In step S25, the main processor 100 requests the sub-processor (specifically, the intermediate control processor 200a, the decode processor 200b, and the cache processor 200c) to perform image decoding processing and cache processing. At this time, the main processor 100 performs image analysis by the image analysis unit 140 using the image data decoded by the decode processor 200b. Details of the flow of processing by each of these processors will be described later.

  When an image is displayed on the liquid crystal monitor 50 in step S30, the main processor 100 determines whether the user has performed a display image switching operation using the operation reception unit 130 (step S35). If there is a switching operation, the main processor 100 returns the processing to step S10, and specifies the image after switching as a display image. On the other hand, when there is no switching operation, the main processor 100 accepts the setting of the number of prints from the user by the operation accepting unit 130 (step S40).

  When receiving the setting of the number of prints, the main processor 100 determines whether the user has pressed the print button 44 by the operation reception unit 130 (step S45). If the print button 44 is not pressed, the process returns to step S35, and it is determined again whether a display image switching operation has been performed.

  If it is determined in step S45 that the print button 44 has been pressed (step S45: Yes), the main processor 100 inputs image data with the number of prints set to one or more from the memory card MC (step S50). . Based on the image analysis result of the image data, the image quality adjustment processor 200d adjusts the image quality (step S55). Thereafter, the halftone processor 200e performs halftone processing, and printing is performed while the printing control unit 160 controls the printing mechanism (step S60).

  The flow of the printing process by the printing apparatus 10 according to the present embodiment has been described above. In the above description, after an image is displayed in step S30, it is determined in step S35 whether a display image switching operation has been performed. However, the user may perform an image switching operation before the image is completely displayed, such as during image decoding processing, instead of such timing. Therefore, in the following, details of processing when an image switching operation is performed during the processing in step S25 and step S30 will be described. Hereinafter, an operation in which the user switches the display image before the image is completely displayed is referred to as an “interrupt operation”.

C. Processing of each processor when there is no interrupt operation:
Prior to the description when there is an interrupt operation, first, the processing contents of each processor when there is no interrupt operation will be described below.

  FIG. 5 is an explanatory diagram showing the processing contents of each processor executed in steps S25 and S30 of FIG. 4 when there is no interrupt operation. As shown in the figure, the main processor 100 first requests the intermediate control processor 200a to decode the image specified as a display target (here, “image A”) (step Sa10). Then, the intermediate control processor 200a transfers this request to the decode processor 200b (step Sa12). Upon receiving this request, the decode processor 200b decodes the image A for each band using the decode area in the shared memory 70 (step Sa14).

  When decoding the image A for each band, the decode processor 200b reports to the intermediate control processor 200a that the decoding has been completed each time decoding of one band is completed (step Sa16). Then, the intermediate control processor 200a receives this report and gives an instruction to cache the decoded image to the cache processor 200c (step Sa18). Upon receiving this cache instruction, the cache processor 200c reads the decoded image for one band from the decode area, resizes it to a predetermined size (in this embodiment, VGA size), and writes it to the cache area. (Step Sa20). This cache operation by the cache processor 200c is repeated until decoding of all the bands in the image A is completed.

  When the cache processor 200c finishes the cache processing for one band in step Sa20, the cache processor 200c notifies the intermediate control processor 200a that the cache for one band is completed (step Sa22). Upon receiving this notification, the intermediate control processor 200a reads one band of the decoded image from the decoding area of the shared memory 70, and resizes it according to the resolution of the liquid crystal monitor 50 (QVGA size in this embodiment). (Step Sa24). Then, the resized image data for one band is transferred to the main processor 100 (step Sa26).

  When the main processor 100 receives the transfer of the image data from the intermediate control processor 200a, the display control unit 120 displays the image on the liquid crystal monitor 50 (step Sa28). When the processing by each processor described above is performed for all bands in the image, the cache of the image A in the shared memory 70 and the display of the image A on the liquid crystal monitor 50 are completed.

  In the above-described processing, when the main processor 100 requests the intermediate control processor 200a to decode an image in step Sa10, the main processor 100 does not substantially transfer until receiving image data transfer in step Sa26 unless there is an image switching operation from the user. In the idle state, no processing is performed. Therefore, the main processor 100 uses this time to read the image data currently being cached from the cache area by the image analysis unit 140 and analyze the image (step Sa30). By doing so, it is not necessary to analyze the image at the start of printing in step S60 of FIG. 4, so that the speed of the entire printing process can be improved.

  The processing contents of each processor when there is no interrupt operation have been described above. Next, the processing content of each processor when an interrupt operation is performed at the timing indicated as “step Sa32” in FIG. 5 will be described.

D. Processing of each processor when an interrupt operation is performed:
FIG. 6 is an explanatory diagram showing the processing contents of each processor when an interrupt operation is performed. When the main processor 100 detects that the user has performed an interrupt operation by the operation receiving unit 130, the main processor 100 first requests the intermediate control processor 200a to decode the image B to be displayed next (step Sa40). Then, the intermediate control processor 200a transfers this request to the decode processor 200b (step Sa42). Upon receiving this request, the decoding processor 200b interrupts decoding of the image A and starts decoding of the image B (step Sa44).

  In step Sa40, when the main processor 100 requests the intermediate control processor 200a to decode the image B, the main processor 100 reads data in the middle of the cache from the cache area of the image A, and the image analysis unit 140 causes the image analysis unit 140 to analyze the image A. Is performed (step Sa62). Then, the main processor 100 reads from the memory card MC the undecoded portion of the image A remaining with the interruption of the decoding processing of the image A, and performs the decoding processing of the remaining portion using the takeover processing unit 150 (step) Sa64). When the decoding process is performed, the handover processing unit 150 resizes the size of the decoded part (step Sa66), and performs the remaining image analysis using the resized image data (step Sa68). Further, the takeover processing unit 150 stores the resized decoded data in the cache area of the image A. By doing so, the main processor 100 can complete all the decoding processing, caching processing, and image analysis of the image A interrupted by the interrupt operation.

  While the main processor 100 performs the above-described processing (steps Sa62 to Sa70), the decode processor 200b decodes the image B (step Sa44), and the cache processor resizes and caches the decoded image B. Writing to the area is performed (step Sa50). Further, the intermediate control processor 200a receives instructions to the decode processor 200b and the cache processor 200c and receives various notifications (steps Sa42, Sa46, Sa48, Sa52) and resizes the display image (step Sa54). That is, a processor other than the main processor 100 performs the same process on the image B as the normal process shown in FIG.

  When the main processor 100 receives the transfer of the display image from the intermediate control processor 200a, the main processor 100 interrupts the processing from step Sa62 to Sa70 described above and displays the received image B. When this display process is completed, the main processor 100 executes the above-described steps Sa62 to Sa70 for the entire image A.

  When the decoding and caching for the image A is completed, the main processor 100 starts image analysis using the cache data for the image B (step Sa72). If an interrupt operation is further performed by the user during the analysis, each processor repeatedly executes the processing shown in FIG.

  FIG. 6 shows an example in which the image analysis of the image B is performed after the display of the image B is completed. However, the timing when the analysis, decoding, and cache processing of the image A are completed does not necessarily coincide with the timing when the display of the image B is completed. Therefore, if the timing at which each process for image A ends is earlier than the timing at which display of image B is completed, main processor 100 starts analysis on image B before the display of image B is completed. . Also, if the timing for completing each process for the image A is later than the timing for completing the display of the image B, the analysis process for the image B is started as soon as the processing for the image A is completed. In this way, the main processor 100 can asynchronously execute image display and image analysis, and can efficiently advance the printing process.

  According to the printing apparatus 10 of the present embodiment described above, even if the cache processing of an image being displayed is interrupted by a user interrupt operation, the main processor 100 takes over the cache processing instead of the cache processor 200c. Can do. Therefore, if the image is displayed on the liquid crystal monitor 50 even for a short time, the entire image is normally cached in the shared memory 70. As a result, even if the user switches display images one after another, the image can be re-displayed at high speed using the cached image.

  In this embodiment, the image data is analyzed during the idle time of the main processor 100. Therefore, it is not necessary to analyze the image at the start of printing, and the printing process can be performed at high speed. In the present embodiment, even when the main processor 100 takes over the cache process from the cache processor 200c, the main processor 100 starts the takeover process after completing the analysis of the image. Therefore, image analysis can be performed for all images displayed on the liquid crystal monitor 50. As a result, the image quality can be appropriately adjusted regardless of which image is selected as a print target among the displayed images.

  In this embodiment, the decoded image is cached by a processor that decodes the image or a processor that is different from the processor that performs the image analysis. For this reason, it is possible to prevent the decoding process from being stopped and the image analysis from being interrupted along with the cache processing of the image data, and the image can be displayed efficiently.

  As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention is not limited to such an Example, and can take a various structure in the range which does not deviate from the meaning. For example, a function realized by software may be realized by hardware.

1 is an external view of a printing apparatus. 2 is a block diagram illustrating an internal configuration of the printing apparatus. FIG. It is explanatory drawing which shows the example by which image data and GUI were displayed on the liquid crystal monitor by the display control part. 6 is a flowchart illustrating an outline of a printing process. It is explanatory drawing which shows the processing content of each processor when there is no interruption operation. It is explanatory drawing which shows the processing content of each processor when interruption operation is performed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Printing apparatus 20 ... Scanner 25 ... Scanner control circuit 30 ... Memory card slot 35 ... Card interface 40 ... Operation panel 41 ... Image switching button 43 ... Print number setting button 44 ... Print button 45 ... Input interface 50 ... Liquid crystal monitor 55 ... Liquid crystal controller 60 ... Printing mechanism 70 ... Shared memory 80 ... ROM
DESCRIPTION OF SYMBOLS 100 ... Main processor 110 ... File management part 120 ... Display control part 130 ... Operation reception part 140 ... Image analysis part 150 ... Transfer processing part 160 ... Print control part 200a ... Intermediate control processor 200b ... Decoding processor 200b ... Sub processor 200c ... Cache Processor 200d: Image quality adjustment processor 200e: Halftone processor

Claims (8)

An image display device for displaying image data on a display device,
A receiving unit for receiving selection of image data to be displayed on the display device from a plurality of image data recorded on a predetermined recording medium;
A cache unit that executes a cache process for reading the selected image data from the recording medium and caching the read image data in a memory;
When the accepting unit accepts selection of other image data during the cache processing of the one image data by the cache unit, the cache processing of the one image data by the cache unit is interrupted, and the interruption An image display apparatus comprising: a takeover processing unit that takes over the cache processing of the one image data taken over from the cache unit. The image display device according to claim 1, further comprising:
An image analysis unit that performs an analysis process of the image data with reference to the image data cached in the memory;
An image display device comprising: an image quality adjustment unit that adjusts an image quality of the image data according to a result of the analysis process. The image display device according to claim 2,
When the accepting unit accepts the selection of the other image data during the cache processing of the one image data by the cache unit, the image analyzing unit caches the one cached by the takeover processing unit. An image display device that performs the analysis processing on the other image data after performing the analysis processing on the image data. The image display device according to any one of claims 1 to 3,
The image display device that executes the cache processing after the cache unit reduces the resolution of the selected image data to a resolution set according to the resolution of the display device. An image display device according to any one of claims 1 to 4,
The cache unit is realized by one processor executing a predetermined control program,
The takeover processing unit is an image display device realized by another processor executing a predetermined control program. The image display device according to any one of claims 1 to 5, further comprising:
When the selected image data is cached in the memory, the selected image data is input from the memory and displayed on the display device. When the selected image data is not cached in the memory, the An image display device comprising: a display control unit that inputs the selected image data from a recording medium and displays the selected image data on the display device. An image display device according to any one of claims 1 to 6,
A setting unit for setting the number of prints for the image data displayed on the display device;
A printing unit for printing image data in which the number of prints is set to one or more;
A printing apparatus comprising: An image caching method for caching image data to be displayed on a display device,
Accepting selection of image data to be displayed on the display device from a plurality of image data recorded on a predetermined recording medium;
A cache processor that reads the selected image data from the recording medium and caches the selected image data in a memory is executed by a predetermined processor,
When the selection of another image data is accepted during the cache processing of the one image data by the predetermined processor, the cache processing of the one image data by the predetermined processor is interrupted and the interrupt is performed. An image cache method for causing the cache processing of the one image data to be executed from the predetermined processor to another processor.

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