JP2002262215A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device capable of continuously displaying still images with a storage device that is inexpensive and also has relatively small capacity. SOLUTION: A flash memory 2 is provided with a compressed image data storing part 2B and a decompressed image data storing part 2C for storing compressed image data and decompressed image data, and image data selection by an MPU 1 for commanding a display schedule is conducted from the decompressed image data storing part 2C. When the flash memory 2 reaches prescribed use memory capacity, decompressed image data to be displayed after image data whose display time is long are erased from the storing part 2C, and when corresponding image data do not exist in the storing part 2C, the compressed image data of the storing part 2B are decompressed to be stored in a DRAM 3, and images are switched when the decompression is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image display device suitable for continuously displaying still images.

[0002]

2. Description of the Related Art A conventional image display apparatus is disclosed in
No. 43080, a video camera arranged in an elevator car for taking an image of the inside of an elevator car, an image display device for displaying an image signal of the video camera, and a display for displaying on the image display device A message unit having an image memory for storing image signals for use in advance, a display memory for storing a display pattern signal, and selecting and outputting an output signal of a teletext receiver or an image signal stored in the image memory; A display unit having switching means for switching between an output signal of the camera and an output signal of the message unit and supplying the output signal to the image display device, and wherein the switching means displays the output of the video camera for a short time when an external trigger input is detected. The message unit is supplied to the device, and the message unit is connected to a personal computer. The display unit is capable of rewriting the display pattern signal via this interface, and the message unit selects the stored image signals stored in the image memory in a predetermined order to the image display device installed in the elevator car. The security effect is improved by displaying the images sequentially for a predetermined time so that the passengers do not get bored while the elevator is running, or by periodically displaying the image of a video camera installed in the car.

Japanese Patent Application Laid-Open No. Hei 8-2 discloses an image display apparatus which continuously expands compressed image data and displays the image data without a sense of incongruity.
As described in Japanese Patent No. 51538, a storage means for storing data read from an information recording medium storing a plurality of data streams, a buffer memory for temporarily holding compressed image data included in the data read from the information recording medium, An image processing unit comprising a decoder for decoding compressed image data and an output image frame memory having a plurality of banks for temporarily holding output data of the decoder, storage means and control of the image processing part and from the storage means to the image processing part Means for clearing a buffer memory, means for detecting a request to switch a compressed image data stream, and reproducing one compressed image data stream in a system for continuously reproducing compressed data of an image having a central processing unit for transferring data of Received a request to switch to another compressed image data stream At the same time, the transfer of the currently reproduced compressed image data to the image processing unit is stopped, the buffer memory is cleared and the recorder is reset, and then, the transfer of the other compressed image data to the image processing unit is started. Control means for controlling the playback of the compressed image data stream was provided, and continuous playback was realized in which the viewer did not feel uncomfortable by suppressing the gap between images and the gap of the image by connecting the streams. Things are known.

[0004]

However, the conventional image display device described in Japanese Patent Application Laid-Open No. H11-343080 discloses an image memory for storing a plurality of images of a car traveling for less than one minute. The storage capacity is small, and in order to store a plurality of image data in this small-capacity image memory, it is common to compress and store the image data and decompress it when displaying it. There is an image that takes a long time to decompress, so that a preset time cannot be displayed, or a blank time occurs between images. For example, if an owner of a building where an elevator is installed uses an image display device installed in the elevator car to display commercial images of stores and canteens and to get the advertisement fee, it was created upon receiving an order The display time of the commercial image is not displayed for a preset time. On the other hand, these problems can be solved by increasing the capacity of the image memory and displaying the image data from the decompressed image data. However, when the image memory is expensive and when the used capacity of the image data is small, the capacity is reduced. A large image memory is wasted.

On the other hand, the image display device described in Japanese Patent Application Laid-Open No. 8-251538 can suppress image displacement by blank time occurring between images or by connecting streams. A decoder device for decompressing the compressed image is required, or complicated data processing needs to be performed, which is too sophisticated for a device that only displays a still image on a monitor device continuously for a preset time.
The cost of the equipment has been high.

An object of the present invention is to provide an image display device which is inexpensive and enables continuous display of still images with a storage device having a relatively small capacity.

[0007]

In order to achieve the above object, the present invention provides a storage means for storing a plurality of compressed image data, and a decoding means for expanding the image data stored in the storage means so that the image data can be displayed. A monitor for storing the image data expanded by the decoding means in the RAM and displaying the image data stored in the RAM; and a display sequence for repeatedly displaying the plurality of image data on the monitor. And a display schedule commanding means for storing data in which respective display times are set in advance, wherein the storage means comprises: a compressed image data storage unit for storing a plurality of the compressed image data; A decompressed image data storage unit for storing the image data obtained by decompressing the plurality of image data obtained by the decoding means; A storage capacity stored in the storage means is characterized by comprising a data erasing means for erasing at least one of the plurality of imaging data stored in the extended imaging data storage unit becomes a predetermined capacity.

The image display apparatus of the present invention is provided with a compressed image data storage section for storing compressed image data in storage means, and an expanded image data storage section for storing image data expanded by the decoding means. When the storage capacity reaches a predetermined capacity, a data erasing unit for erasing at least one of the plurality of image data stored in the expanded image data storage unit is provided. Still images can be displayed continuously even with a storage unit having a small capacity.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an image display apparatus according to an embodiment of the present invention.

An MPU 1 for processing data such as a decoding process for expanding compressed image data, a flash memory 2 as storage means for storing display schedules such as display order and display time of image data and images, A DRAM 3 which is a RAM for temporarily storing data read from the memory 2 and processing information of the MPU 1
And a ROM for storing a program describing a processing procedure
4 and D storing image data decoded by the MPU 1
The graphic memory 5, which supplements the RAM 3, the monitor device 6, and the MPU 1 which transmits data to the graphic memory 5 and transmits image data stored in the graphic memory 5 to the MPU 1
, A graphic chip 7 for outputting an image switching signal selected and transmitted to the monitor device 6, a modem 8 as communication means, and an image center 1 connected to the modem 8
And an I / F circuit 11 for performing communication with 0. The I / F circuits 11 are connected to each other by a bus line 12. The modem 8 is connected to an image center 10 that is remotely connected via a communication line 9.

The flash memory 2 includes a schedule data storage unit 2A for storing a display schedule such as a display order and a display time in an image displayed on the monitor device 6, and a personal computer (not shown) from the image center 10 via the communication line 9. A compressed image data storage unit 2B for storing the compressed image data to be connected and transmitted, a program stored in the ROM 4, and an M for processing the program
Decoding means constituted by PU1 and having an expanded image data storage unit 2C for storing expanded image data obtained by expanding compressed image data.

Here, the schedule data storage unit 2A
Has a plurality of image schedule areas 2A1-2AN, and since each of the image schedule areas 2A1-2AN has the same configuration, the image schedule area 2A
A1 will be described. An identification code area 2A1a for identifying the image data, a display time area 2A1b for storing the display time of the image data, and an alarm area for indicating the presence or absence of any alarm sound when the image data is displayed. 2A1c. The compressed image data storage unit 2B stores a plurality of compressed image areas 2B1 to 2BN.
Since the compressed image areas 2B1 to 2BN have the same configuration, the compressed image area 2B1 will be described here.
B1a, and a compressed image data area 2B1b for storing compressed image data corresponding to the identification code.
The expanded image data storage unit 2C also stores a plurality of expanded image areas 2C.
C1 to 2CN, and each extended image area 2C1
Since 2CN has the same configuration, here the expanded image area 2
Explaining C1, it is composed of an identification code area 2C1a for identifying image data, and an expanded image data area 2C1b for storing expanded image data corresponding to the identification code. The data erasing means for erasing the decompressed image data stored in the decompressed image data storage unit 2C of the flash memory 2 is composed of the MPU 1 and the ROM 4 program.

FIG. 2 is a flowchart showing the operation of the above-described image display device.

First, in step SA1, the MPU 1 creates a decoded image file of the compressed image stored in the compressed image data storage unit 2B of the flash memory 2 in the expanded image data storage unit 2C. Before reading data, first display count i
To 0. Next, at step SA3, the MPU 1 determines whether or not the value of the display count i is 0, and when it is 0,
At step SA4, a preset display schedule of the image schedule areas 2A1-2AN is stored in the DRAM 3 from the flash memory 2, and at step SA5, 1 is added to the display count i. On the other hand, if the display count i is not 0 in step SA3, the processing in step SA5 is performed.

Next, the first image data of the display schedule is fetched and the processing related to the display is performed. That is, at step SA6, the MPU 1 confirms the presence of the first display count i + 1th decoded file in the expanded image data storage unit 2C, and if there is a compressed image decoded file, at step SA7, The graphic chip 7 reads a decoded file matching the identification code area 2A1a for identifying the first image data of the image schedule area 2A1 from the expanded image data storage unit 2C, and stores the decoded file in the graphic memory 5. Since the image data to be displayed next is stored in the graphic memory 5 during the display on the monitor device 6, the display is not performed while the first image data is being captured. The last image of the schedule is displayed.

Here, the first image data is displayed on the monitor 6.
And the second image data is stored in the graphic memory 5.
Is stored, it is determined in step SA8 whether or not the display time for the first image data of the schedule data storage unit 2A has been exceeded.
If the display time has elapsed, the process proceeds to step SA9 to determine whether the decoded file corresponding to the second image data has been stored in the graphic memory 5. If the storage is not completed, the process of step SA7 is performed. If the storage is completed, the process proceeds to step SA10.
PU1 determines whether or not the display count i is N, that is, whether it is the last data of the display schedule. If not, the process returns to step SA3. However, in the case of the last data, it is determined in step SA11 whether or not the storage capacity of the flash memory 2 exceeds 90%.
If it does not exceed 0%, return to step SA2, 90%
Is exceeded, the expanded image data in the expanded image data storage unit 2C is deleted in step SA12, and the flow returns to step SA1.

In step SA6, if there is no decoded file of the display count i + 1 in the expanded image data storage unit 2C, while the image data of the display count i is displayed on the monitor device 6 in step SA13. The MPU 1 decompresses the compressed image data corresponding to the display count i + 1-th image data stored in the compressed image data storage unit 2B and stores it in the graphic memory 5.
Next, in step SA14, it is determined whether or not the first image data of the schedule data storage unit 2A has exceeded the display time. If it is within the display time, the process of step SA13 is continued. It is determined whether the decoding has been completed for the compressed image data corresponding to the display count i + 1-th image data. If the decoding has not been completed, the process of step SA13 is performed. If the decoding has been completed, the process of step SA10 is performed.

FIG. 3 is a flowchart showing a detailed process of creating a decoded file of the compressed image in step SA1 shown in FIG.

At step SB1, the MPU 1 stores a preset display schedule of the image schedule areas 2A1-2AN from the flash memory 2 in the DRAM 3,
The image schedule areas 2A1-2 are arranged in ascending order of the display time displayed in the display time area 2A1b in step SB2.
Listed from AN, and the signs of counts J = 1 to N are assigned. Then, after resetting the count j to 0 in step SB3, the count j is set to 1 in step SB4.
Is added.

Next, in step SB5, the MPU 1 determines whether or not the decoded file of the image data to be displayed next to the count j of the image data in the flash memory 2 exists in the expanded image data storage unit 2C, in the identification code area 2C1a.
Confirm with ~ 2CNa, and if present, return to step SB4. On the other hand, when the decoded file does not exist, in step SB6, the corresponding identification code to be displayed next to the count j is stored in the identification code area 2B of the compressed image data storage unit 2B.
After searching from 1a to 2BNa and decoding the compressed image data of the corresponding identification code, the identification code and the compressed image data are stored in the expanded image data storage unit 2C of the flash memory 2 in step SB7.

When the compressed image data is stored in the flash memory 2, in step SB8, the MPU 1 determines whether or not the storage capacity of the flash memory 2 exceeds 90%, and if not, step SB9. It is determined whether or not the count j is N, that is, whether it is the last data. If it is not the last data, the process returns to step SB4. On the other hand, if the storage capacity of the flash memory 2 exceeds 90% in step SB8,
In step SB10, finally, the expanded image data storage unit 2C
The extended image data stored in the file is deleted, and the processing ends.

FIG. 4 is a flowchart showing the detailed processing of deleting the expanded image data in the expanded image data storage unit 2C in step SA12 shown in FIG.

In step SC1, the MPU 1 stores a preset display schedule of the image schedule areas 2A1-2AN from the flash memory 2 in the DRAM 3,
The image schedule areas 2A1-2 are arranged in ascending order of the display time displayed in the display time area 2A1b in step SC2.
The list is made from the AN, and the signs of the counts J = 1 to N are assigned. Then, after resetting the count j to 0 in step SC3, 1 is added to the count j in step SC4.

Next, at step SC5, the MPU 1 determines whether or not a decoded file of the image data to be displayed next to the image data count j in the flash memory 2 exists in the expanded image data storage unit 2C.
Check with 2CNa, and if not present, return to step SC4. However, if it exists, the identification code of the image data to be displayed next to the count j in step SC6 is stored in the identification code areas 2C1a to 2CN of the expanded image data storage unit 2C.
a, and the expanded image data of the corresponding identification code is deleted. In the next step SC7, the MPU 1 determines whether or not the storage capacity of the flash memory 2 exceeds 90%, and if one of the decompressed image data exceeds 90%, the flow proceeds to step SC4. Return deletion processing is continued, and if it does not exceed 90%, it ends.

FIG. 5 shows the compressed image data of the compressed image data areas 2B1b to 2B3b stored in the compressed image data storage unit 2B and the expanded image data areas 2C1b to 2C3b stored in the expanded image data storage unit 2C. It is a characteristic diagram which compared display processing time using data.

Compressed image data area 2B1b to 2B3b
1 second to read the compressed image data in 2C, 2 seconds to decode the compressed image data in the compressed image data areas 2B1b to 2B3b, and 2C1
Each reading in b to 2C3b takes 2 seconds. The display time is 3 seconds for each of the compressed image data of the compressed image data 2B1b area and 3 seconds for the expanded image data 2C1b of the expanded image data area, and the compressed image data area 2B2.
b compressed image data and expanded image data area 2C2
The expanded image data of b is 2 seconds each, and the compressed image data of the compressed image data area 2B3b and the expanded image data of the expanded image data area 2C3b are each 3 seconds.

When it is desired to display these image data on the monitor device 6 continuously for a set time, the compressed data is decoded and then displayed on the monitor device 6. In FIG. 5A, the compressed image data areas 2 B 1 b to 2 B 3 b are displayed. When the decoding of the compressed image data is completed, the display is switched to the monitor device 6, so that the compressed image data area 2B
Since the decoding of the 2B3b compressed image data in the compressed image data area cannot be completed within 2 seconds while the 2b compressed image data is displayed, the display time is set to 2 seconds when the compressed image data in the compressed image data area 2B2b is set. On the other hand, the actual display time is 3 seconds, and the display time set in advance is deviated.

On the other hand, in FIG. 5B in which the decompressed data is directly read into the graphic memory 5 and displayed on the monitor 6, the time required for decoding the compressed image data in the compressed image data areas 2B1b to 2B3b is 2
Since seconds are not required, the compressed image data areas 2B1b to 2B
Even if the time for reading the compressed image data 3b into the graphic memory 5 is set to 2 seconds, the image can be displayed in the same time as the preset display time.

As described above, the flash memory 2 stores both the compressed image data of the compressed image data areas 2B1b to 2BNb and the expanded storage data of the expanded image data areas 2C1b to 2CNb. In the case of 90% or less, the 2C1b to 2CNb decompressed storage data in the decompressed image data area is read into the graphic memory 5 as appropriate in accordance with the display schedule and displayed on the monitor device 6, so that the display time set in the display schedule is No out of order.

Next, the used storage capacity of the flash memory 2 exceeds 90%, and the expanded image data areas 2C1b to 2C
FIG. 6 shows a procedure for deleting one of the Nb decompressed storage data.
This will be described below.

The display time stored in the display time areas 2A1b to 2A4b of the schedule data storage unit 2A is 5
Seconds, 3 seconds, 4 seconds, and 4 seconds, and when the compressed image data of the compressed image data areas 2B1b to 2B4b and the expanded storage data of the expanded image data areas 2C1b to 2C4b are displayed in this order, the used storage capacity of the flash memory 2 is 9
If it exceeds 0%, the display time areas 2A1b to 2A2 of the schedule data storage unit 2A are displayed in step SC2 shown in FIG.
Decompressed image data area 2C in ascending order of display time of A4b
The decompressed storage data of the decompressed image data area 2C1b, the decompressed storage data of the decompressed image data area 2C3b, the decompressed storage data of the decompressed image data area 2C4b, and the decompressed storage of the decompressed image data area 2C2b are rearranged. Data order. Step SC
5. In step SC6, the expanded storage data in the expanded image data area 2C2b to be displayed next to the expanded storage data in the expanded image data area 2C1b having the longest display time is deleted from the expanded image data storage unit 2C. Therefore, the used storage capacity of the flash memory 2 can be kept at 90% or less.

As described above, both the compressed image data and the decompressed image data are stored in the flash memory 2, and the decompressed image data is deleted according to the used storage capacity, and the corresponding compressed image data is replaced with the deleted decompressed image data. Since the image data is decoded before the display order and stored in the graphic memory 5, even a flash memory having a relatively small storage capacity can be used for a long period of time, and an economical device can be used. Can be provided.

More specifically, the flash memory 2 as storage means is provided with a compressed image data storage section for storing compressed image data and an expanded image data storage section for storing image data expanded by the decoding means. The selection of the image data of the display schedule command means is performed from the expanded image data storage unit, and when the storage capacity of the storage means reaches a predetermined capacity, the data erasing means sets a long display time stored in the display schedule command means. The expanded image data to be displayed next to the image data is deleted from the expanded image data storage unit. If the image data selected by the display schedule command means does not exist in the expanded image data storage unit, the compressed image data in the compressed image data storage unit is deleted. Is expanded by the decoding means and stored in the RAM, and the image is switched when the expansion of the image data is completed. Therefore, the expanded image data to be displayed next can be stored in the RAM while the image is being displayed, and the display of the image data is a large-capacity image data that requires a long time for expansion without disturbing the set time. Also, there is no blank time between images. Also,
By erasing the expanded image data, the used capacity of the storage means can be limited, and the storage means having a relatively small capacity can be used for a long time, and is economical.

FIG. 7 is a flowchart of the image display apparatus according to another embodiment of the present invention.

At step SD1, the MPU 1 resets the display count i to i = 0, and then proceeds to step SD2
It is determined whether or not the numerical value of the display count i is 0. If the display count i is 0, the preset display schedule area of the image schedule areas 2A1 to 2AN is stored in the DRAM 3 from the flash memory 2 in step SD3, At step SD4, 1 is added to the display count i.
On the other hand, if the display count i is not 0 in step SD2, the process of step SD4 is performed.

Next, processing for taking in and displaying the first image data in the display schedule is performed. That is, the MPU 1 confirms in step SD5 that the decoded file of the display count i + 1 is present in the expanded image data storage unit 2C, and if there is no display count i + 1 of the decode file in the expanded image data storage unit 2C, step SD6 While the i-th image data of the display count is being displayed on the monitor device 6, the compressed image data storage unit 2
The compressed image data corresponding to the (i + 1) th display count image data stored in B is decompressed and stored in the graphic memory 5.

Next, in step SD7, it is determined whether or not the image data of the display count i in the schedule data storage unit 2A has exceeded the display time.
Continue the processing of D6, and if the display time is exceeded, step SD
In step S8, it is determined whether decoding of the compressed image data corresponding to the display count i + 1-th image data has been completed. If the decoding has not been completed, the decoding flag D is set to 1 in step SD9 and the processing in step SD6 is continued. on the other hand,
If the decoding of the corresponding compressed image data has been completed in step SD8, the decoding flag D
Is determined to be 1 or not, and if the decode flag D is not 1, the MPU 1 determines in step SD11 that the display count i is N
It is determined whether or not the data is the last data in the display schedule. If it is not the last data, the process returns to step SD2. If it is the last data, the process returns to step SD1.

If the decoding flag D = 1 in step SD10, the decoded file already decoded in step SD12 and stored in the graphic memory 5 is assigned an identification code in the expanded image data recording section 2C of the flash memory 2. Then, in step SD13, the decoding flag is set to D = 0, and the process returns to step SD11.

If the corresponding decoded file exists in the expanded image data storage unit 2C in step SD5, the graphic chip 7 sends the image schedule area 2A1 from the expanded image data storage unit 2C in step SD14.
The decoded file matching the identification code area 2A1a for identifying the i-th image data of the display count is read from the expanded image area 2C1 and stored in the graphic memory 5. In addition, since the image data to be displayed next is stored in the graphic memory 5 during the display, the image data to be displayed on the monitor device 6 is displayed while the i-th image data of the display count is fetched. It is not displayed or the last image of the display schedule is displayed.

Here, when the monitor device 6 displays the image data of the display count i and the image data of the display count i + 1 is stored in the graphic memory 5,
In step SD15, it is determined whether or not the display time for the i-th image data in the display count of the schedule data storage unit 2A has exceeded.
Is continued, and if the display time is exceeded, step SD1
In step 6, it is determined whether or not the decoded file corresponding to the image data of the display count i + 1 is stored in the graphic memory 5, and if not completed, the process of step SD14 is performed. If completed, the process returns to step SD11.

FIG. 8 is a characteristic diagram when decoding and displaying the compressed data in the compressed image data area 2B2b.

The display time recorded in the display time areas 2A1b to 2A4b of the schedule data storage unit 2A is 5
Assuming that seconds, 4 seconds, 3 seconds, and 4 seconds, the compressed image data areas 2B1b to 2B4b are set to be displayed in the order of the compressed data, and the display time of the compressed image data area 2B1b and the compressed image data area 2B2b is displayed. Decoding of the compressed data in the compressed image data area 2B2b or the compressed image data area 2B3b is completed within a certain 5 seconds or 4 seconds. On the other hand, the compressed image data area 2B during the display time of the compressed data of the compressed image data area 2B3b of 3 seconds.
The decoding of the compressed data of 4b does not end.

However, if it is detected in steps SD7 to SD10 that the display time of the compressed data in the compressed image data area 2B3b has reached 4 seconds and has exceeded the set time of 3 seconds in steps SD7 to SD10, then in step SD12 the compressed image data area 2B4b Since the decompressed image data obtained by decoding the compressed data is stored in the decompressed image data area 2C4b, when the decompressed image data is fetched into the graphic memory 5 and displayed on the monitor 6, the steps SD14 to SD1 are performed.
Since the decompressed image data in the decompressed image data area 2C4b is read in the procedure of 6, the time for decoding the compressed data in the compressed image data area 2B4b is omitted, and the display is performed according to the display time stored in the display time areas 2A1b to 2A4b. be able to.

As described above, the expanded display time comparing means compares the display time of the image data with the expansion time of the image data to be displayed next, and decodes the image data when the expansion time of the image data to be displayed next is long. Since the image data is decompressed and stored in the decompressed image data storage unit, even if a relatively small-capacity storage device is used, a still image can be continuously output without causing a blank time between images. It can be displayed, can flexibly cope with a change in image data, and does not require a high-performance and expensive decoder for expanding a compressed image.

[0046]

As described above, the image display apparatus according to the present invention comprises a compressed image data storage section for storing compressed image data in storage means, and an expanded image data storage section for storing image data expanded by decoding means. When the storage capacity of the storage means reaches a predetermined capacity, a data erasing means for erasing at least one of the plurality of image data stored in the decompressed image data storage unit is provided. It is inexpensive, and it is possible to display still images continuously with a storage unit having a relatively small capacity.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image display device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the image display device shown in FIG.

FIG. 3 is a flowchart showing details of a main part of the flowchart shown in FIG. 2;

FIG. 4 is a flowchart showing in detail another main part of the flowchart shown in FIG. 2;

5 is a characteristic diagram comparing display processing times of compressed image data and expanded image data of the image display device shown in FIG. 1;

FIG. 6 is a characteristic diagram in a case where any one of the expanded storage data of the image display device shown in FIG. 1 is deleted.

FIG. 7 is a flowchart showing an operation of the image display device according to another embodiment of the present invention.

8 is a characteristic diagram when decoding and displaying compressed data in the image display device shown in FIG. 7;

[Explanation of symbols]

 1 MPU 2 Flash Memory 2A Schedule Data Storage 2B Compressed Image Data Storage 2C Decompressed Image Data Storage 3 DRAM 6 Monitor 7 Graphic Chip

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C052 CC11 GA02 GA03 GA08 GA09 GC05 GE06 GF01 5C053 FA07 FA27 GA11 GB21 JA21 KA04 KA24 LA06 5C082 AA27 BA20 BB44 DA22 DA53 DA86 DA89 EA08 MM04

Claims (4)

[Claims] 1. A storage means for storing a plurality of compressed image data, a decoding means for expanding the image data stored in the storage means so as to be displayed, and the image data expanded by the decoding means being stored in a RAM. While storing,
A monitor device for displaying the image data stored in the RAM; and a display schedule command means for storing data in which a display order and a display time for each of the plurality of image data to be repeatedly displayed on the monitor device are set in advance. In the image display device provided, the storage unit includes:
A compressed image data storage unit that stores the plurality of compressed image data, and an expanded image data storage unit that stores the image data obtained by expanding the plurality of compressed image data by the decoding unit. An image display apparatus comprising: a data erasing unit that erases at least one of a plurality of image data stored in the expanded image data storage unit when a storage capacity stored in a storage unit reaches a predetermined capacity. 2. The expanded image data storage unit according to claim 1, wherein said data erasing means erases the expanded image data to be displayed next to the image data having a longer display time from the expanded image data storage unit. Image display device. 3. The expanded image data storage section according to claim 1, wherein said display schedule command means selects image data from said expanded image data storage section. An image display device characterized by outputting an image switching signal for switching an image when the processing is completed. 4. A storage means for storing a plurality of compressed image data, a decoding means for expanding the image data stored in the storage means so as to be displayed, and storing the image data expanded by the decoding means in a RAM. A monitor device for displaying the image data stored in the RAM, a display schedule for storing a plurality of the image data on the monitor device in a display order and a display time set in advance for each display time. An image display device comprising command means, wherein the image data to be displayed next to the image data displayed on the monitor device is expanded by the decoding means, and the display time of the image data is displayed next. An extension display time comparison means for comparing the extension time of the image, and An image display device comprising an expanded image data storage unit for storing image data in the storage means.