JPH04273677A - Picture display device - Google Patents

Abstract

PURPOSE:To vary a reduction rate of a reduced picture of the picture display device in the reproduction of multi-screen. CONSTITUTION:A picture number data is stored in a memory card 1 of the picture display device of this invention by its maximum storage capacity. A system control CPU 12 obtaines a maximum picture number able to be stored in the memory card based on the maximum storage capacity data and an average data quantity forming a preset pattern and decides the reduction rate so that the picture of the picture number is displayed in one screen. Moreover, the CPU decides the reduction rate so that the picture of the picture number is displayed in one screen based on the picture number data. Furthermore, a reduction rate larget than the reduction rates is decided. The reduction rate is given to a reduction picture forming circuit 16, in which the reduction rate is changed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device applied to, for example, a digital still camera system.

0002

2. Description of the Related Art Conventionally, there has been known an apparatus that reads data from a recording medium storing digital color image signals, converts the data into an analog video signal, and displays the converted signal on a monitor or the like. For example, this is an image display device for a digital still camera system that uses an IC memory card as a storage medium.

In such an image display device, data read from a storage medium is stored in a buffer memory such as a field memory or RAM whose memory address is automatically incremented by clock input. The data stored in this memory is D/A converted into an analog video signal and sent to a display unit such as a television monitor.

[0004] Incidentally, a storage medium such as an IC memory card can normally store image data for multiple screens, and when displaying, it is possible to display images for all screens stored in the storage medium as an index screen. It is being displayed on one screen.

On the other hand, since storage media have a fixed capacity, information compression techniques are used to efficiently store vast amounts of digital image data on the storage media. As this information compression technology, for example, Japanese Patent Application No. 2-1631
An adaptive DPCM encoding method such as that shown in No. 27 has been proposed. The encoded and compressed image data is, for example, IC
It is stored in a storage medium which is a memory card.

FIG. 11 shows a conventional image display device that reads image data from a storage medium in which image data is stored and displays the image data as described above. System control CP
U12 controls the memory card control section 15, the RAM control section 14, and the timing generator 13. The memory card control unit 15 reads image data from the memory card 1. The read image data is given to the decoder 2, and the memory card control unit 1
The data is decoded and expanded by the timing clock given from 5. The system control CPU 12 controls the RAM control unit 14 to store the output of the decoder 2 as it is in the normal display mode, while controlling the RAM control unit 14 to store the output of the decoder 2 as is in the index display mode.
The M control unit 14 is switched to perform sampling operation.

Compressed color image data is stored in the memory card 1, divided into R, G, and B (R, G, and B data are not necessarily stored sequentially for each pixel). The output of the decoder 2 is also R, G, and B image data. Therefore, RAM control section 1
4 writes R, G, and B image data into the RAMs 3 to 5 under the control of the system control CPU 12. In the normal display mode, the R, G, and B image data stored in RAMs 3 to 5 are read out as they are by the RAM control unit 14, and are given to the corresponding D/A conversion circuits 6 to 8 and converted into analog signals. Ru. The analog RGB signals are applied to a matrix circuit 9 to generate a luminance signal Y and color difference signals RY and BY. The color difference signals R-Y and B-Y output from the matrix circuit 9 are NT
The color signal C is provided to the SC encoder 10 to create a color signal C. Luminance signals Y and NT output from matrix circuit 9
The color signal C output from the SC encoder 10 and the synchronization signal output from the timing generator 13 are sent to an adder 11.
are added to create an NTSC signal. Under the control of the system control CPU 12, the timing generator 13 provides a read timing clock to the RAM control unit 14 and also provides a data capture clock to the matrix circuit 9.

In the image display device having such a configuration, (I
C) If memory card 1 can store up to 16 screens of image data, in index display mode, Figure 1
As shown in FIG. 2, the screen is divided into 16 (4×4) and each screen is reduced and displayed on one screen (multi-screen). At this time, the RAM control unit 14 creates image data for the reduced screen by thinning out pixels, as shown in FIG. 13, for example. That is, the R (or G, B) image data decoded by the decoder 2 is one screen worth of image data arranged in a matrix shape corresponding to pixels as shown in FIG. Therefore, in order to reduce the image to 1/16, the RAM control unit 14
Image data is sampled at pixel jumps and stored in RAM.
Store in 3. Further, the above operation is performed every three lines in the vertical direction. As a result, the image data of the hatched pixels in FIG. 13 are sampled and stored in the RAM 3. Further, the G and B image data are similarly sampled and stored in the RAMs 4 and 5. At this time, the RAM address for storing the image data of each reduced image is changed so that the display positions of the images on each screen are stored in the order shown in FIG. 12, for example.

[0009]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, the timing of sampling performed by the RAM control section 14 under the control of the system control CPU 12 is fixed, and the screen can only be displayed in reduced size with a fixed number of divisions. Not done. In other words, if a storage medium with a storage capacity equivalent to 32 screens is used, it will be necessary to display the 16-split screen twice in order to display all images, making it impossible to view the entire screen at once. Therefore, there is a problem that it is not suitable as an index. Conversely, if a storage medium with a storage capacity equivalent to 8 screens is used, there will be blank areas in 8 screens of the 16-split screen, making it impossible to view the screen at an appropriate size. There is a point.

Accordingly, the present invention provides an image display device that can appropriately reduce image data for multiple screens stored in storage media of various storage capacities and display it on a single screen with an appropriate number of screen divisions. The purpose is to

[0011]

[Means for Solving the Problems] An image display device according to the present invention includes a storage medium in which image data for a plurality of screens is stored and data storage capacity data, and a reading means for reading data from the storage medium. and reduction rate determining means for determining an image reduction rate based on the data storage capacity data read from the storage medium by the reading means and the amount of image data for one screen, and in an image index display mode, Reduction means for creating reduced screen image data from the image data of each screen read out by the reading means according to the image reduction ratio determined by the reduction ratio determination means; and reduced screen image data created by the reduction means. The present invention is characterized by comprising a display signal reproducing means for reproducing a display signal of a screen in which images of a plurality of screens are reduced and divided into one screen based on the above.

The image display device according to the present invention also includes a storage medium in which image data for a plurality of screens is stored, and image number data indicating how many screens the stored image data is. a reading means for reading data from the storage medium; a reduction rate determining means for determining an image reduction ratio based on the image number data read from the storage medium by the reading means; a reduction means for creating reduced screen image data according to the image reduction ratio determined by the reduction ratio determination means from the image data of each screen read by the means; and reduced screen image data created by the reduction means. The present invention is characterized by comprising a display signal reproducing means for reproducing a display signal of a screen in which images of a plurality of screens are reduced and divided into one screen based on the above.

Furthermore, the image display device according to the present invention includes a storage medium in which image data for a plurality of screens, data storage capacity data, and image number data indicating how many screens of stored image data are stored. , based on a reading means for reading data from the storage medium, the data storage capacity data and the amount of image data for one screen read from the storage medium by the reading means, and based on the image number data. , a reduction rate determining means for determining an image reduction rate, and a reduction rate determining means for determining an image reduction rate, respectively, and a reduction rate determining means for each image reduction rate determined by the reduction rate determining means from the image data of each screen read by the reading means during the image index display mode. a reduction means for creating reduced screen image data by using the reduction means; a selection means for selecting reduced screen image data reduced by any image reduction ratio from among the reduced screen image data reduced by the reduction means; The present invention is characterized by comprising a display signal reproducing means for reproducing a display signal of a screen in which images of a plurality of screens are reduced and divided into one screen based on selected reduced screen image data.

Furthermore, the image display device according to the present invention includes:
A storage medium in which image data for a plurality of screens, data storage capacity data, and image number data indicating how many screens of stored image data are stored; a reading means for reading data from the storage medium; The image reduction ratio is determined based on the data storage capacity data read out from the storage medium by the means and the data amount of one screen's worth of image data, and on the basis of the above-mentioned image number data. a reduction rate determining means for determining a predetermined image reduction rate; and a reduction rate determining means for determining a predetermined image reduction rate; a reduction means for creating reduced screen image data by using the reduction means; a selection means for selecting reduced screen image data reduced by any image reduction ratio from among the reduced screen image data reduced by the reduction means; The present invention is characterized by comprising a display signal reproducing means for reproducing a display signal of a screen in which images of a plurality of screens are reduced and divided into one screen based on selected reduced screen image data.

[0015]

[Operation] Since the image display device according to the present invention is constructed as described above, the reduction ratio of the screen stored in the storage medium is changed depending on the capacity of the storage medium, and the smaller the number of screens, the larger the If the number is large, each of the divided screens will be displayed as one screen, which is suitable as an index.

Further, in the image display device according to the present invention, the reduction ratio of the screen stored in the storage medium is changed according to the number of stored screens, so that all the stored screens are divided into one screen. It is suitable as an index because it is displayed as an index.

Further, in the image display device according to the present invention, the reduction ratio of the screen stored in the storage medium is changed depending on the capacity of the storage medium, and also according to the number of stored screens, It is possible to select any of the displays in which each screen is reduced by these reduction ratios and arranged on one screen, and a suitable display can be selected as an index.

Furthermore, the image display device according to the present invention includes:
The reduction rate of the screen stored in the storage medium is changed depending on the capacity of the storage medium, and also according to the number of stored screens, and further changed to a predetermined reduction rate larger than the above reduction rate. A display in which a plurality of screens reduced at any of these reduction ratios are combined into a single screen can be selected and displayed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An image display device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 10 of the accompanying drawings. In the explanation of each figure, the same components are given the same reference numerals and redundant explanations will be omitted.

FIG. 1 shows an image display device according to an embodiment of the present invention. As is clear from the figure, the image display device according to this embodiment differs from the conventional image display device shown in FIG. 11 in that a reduced screen forming circuit 16 and a switch circuit 17 are provided. The switch circuit 17 is switched by the CPU 12 to take in the output of the decoder 2 in the normal display mode, and is switched to take in the output of the reduced screen forming circuit 16 in the index display mode. Further, the CPU 12 supplies the image reduction rate data "n" to the reduced screen forming circuit 16 to perform reduction processing. Further, the CPU 12 is configured to take in data read out from the memory card 1 by the memory card control section 15, for example, data from the first address to several bytes. Furthermore, when the memory card 1 is inserted, the CPU 12 starts the program of the flowchart shown in FIG. 2 to execute the index display mode automatically or by inputting from a keyboard (not shown) or the like. This program uses CPU12 in advance.
This is the program set to . Further, in this embodiment, capacity data of the memory card 1 is stored in an area of several bytes from the start address of the memory card 1.

[0021] Now, the system is started and memory card 1 is loaded.
is installed, the CPU 12 detects this [2-1]
, controls the memory card control unit 15 to read several bytes from the first address, and detects the capacity of the memory card 1 [2-2]. The CPU 12 has the amount of image data constituting one screen in advance, and calculates the maximum number of screens (m) that can be stored in the memory card 1 from the capacity of the memory card 1 and the amount of data. [2-
3]. Next, the CPU 12 sets the image reduction rate (n) to N2
Find it as the minimum value of an integer N that satisfies ≧m [2-4]. (n) determined in this way is the image reduction ratio,
[2-5] is applied to the reduced screen forming circuit 16. CPU
12 controls the memory card control unit 15 to read the compressed image data of each screen, causes the decoder 2 to decode and expand it, causes the reduced screen forming circuit 16 to perform 1/n reduction processing, and causes the switch circuit 17 to Supported RAM3~5 via
[2-6] For example, image data is stored on the memory card 1 one screen at a time, R, R, R, ..., G, G, G, ...
, B, B, B, ..., the output of the decoder 2 will also be one screen worth of image data for each R, G, B, and so on. As shown in FIG. 12, image data is arranged in pixel correspondence. Therefore, the reduced screen forming circuit 16 performs sampling to correspond to the given reduction ratio (n). That is, if n is "4", sampling is performed at 3 pixel skips and 3 line skips as in FIG. 13, and when n is "2", sampling is performed at 1 pixel skip and 1 line skips, and n If is "5", sampling is performed in 4-pixel skips and 4-line skips, and reduced image data for 16-divided, 4-divided, and 25-divided screens are obtained, and R is processed under the control of the CPU 12.
The image data is given to the corresponding RAMs 3 to 5 by the AM control unit 14, and is stored in the corresponding position of the divided screen in the RAM. When the reduction process is performed in this way and completion of reduction of all images is detected [2-7], the CPU 12
controls the RAM control unit 14 to control each RAM 3 to 5.
The image data is read out from the D/A conversion circuits 6 to 8 to be converted into analog data, and an NTSC signal is created by the matrix circuit 9, NTSC encoder 10, and adder 11, and is sent to a television monitor device (not shown) or the like. . In this way, multi-screen playback is performed with the reduction ratio changed according to the storage capacity of the memory card 1 [2-8].

Next, a case will be described in which the number P of images (planes) of images stored in the memory card 1 is stored in several bytes from the first address of the memory card 1. In order to perform index display using such image data of the memory card 1, the CPU 12 is equipped with a program according to a flowchart shown in FIG. The other configuration of this embodiment is the same as the configuration of the image display device described with reference to FIGS. 1 and 2.

[0023] When the system is started and the memory card 1 is inserted, the CPU 12 detects this [3-1], controls the memory card control unit 15, reads out several bytes from the start address, and calculates the number of stored images. (P) is detected [3-2]. Next, the CPU 12 determines the image reduction rate (n
') as the minimum value of the integer N such that N2 ≧P [
3-3]. The image reduction rate (n′) determined in this way
) is given to the reduced screen forming circuit 16 [3-4]. C
The PU 12 controls the memory card controller section 15 to read out the compressed image data of each screen, causes the decoder 2 to decode and expand the data, causes the reduced screen forming circuit 16 to perform 1/n' reduction processing, and through the switch circuit 17 Compatible RAM3
to 5 [3-5]. For example, memory card 1
The image data is R, R, R, ..., G, G, G, for each screen.
..., B, B, B, ..., the output of the decoder 2 will also be one screen worth of image data for each R, G, B, and so on. As shown in FIG. 12 for each B, image data is arranged in pixel correspondence. Therefore, the reduced screen forming circuit 16 performs sampling corresponding to the given reduction ratio (n'). That is, if n' is "4", sampling is performed at every 3 pixels and every 3 lines as in FIG. 13, and when n' is "2", sampling is performed at every 1 pixel and 1 line. , n'
If is "5", sampling will be performed at 4 pixel skips and 4 line skips, and will be divided into 16, 4, and 25 sections, respectively.
The reduced image data for the split screen is obtained, and the corresponding RAM is stored by the RAM control unit 14 under the control of the CPU 12.
Image data is given to pixels 3 to 5 and stored in corresponding positions of the divided screen in the RAM. When the reduction process is performed in this way and the completion of reduction of all images is detected [3-6],
The CPU 12 controls the RAM control section 14 to
The image data is read out from AM3-5, is given to D/A conversion circuits 6-8 to be converted into analog data, and is converted into analog data by matrix circuits 9,
NTSC encoder 10 and adder 11
A signal is created and sent to a television monitor device (not shown) or the like. In this way, multi-screen playback is performed with the reduction ratio changed according to the number of images (sides) stored in the memory card 1 [3-7].

FIG. 4 shows an image display device according to another embodiment of the present invention. The configuration of the image display device according to this example is as follows:
Each R stores decoded and expanded R, G, and B image data.
1, except that there are two AMs (not necessarily two physically, but two address spaces) 3, 3', 4, 4', 5, 5'. The configuration is the same as that of the image display device. Further, a program of a flowchart as shown in FIG. 5 is set in advance in the CPU 12.
Executed in index display mode. Further, in an area several bytes from the start address of the memory card 1, the number of images (P) of images stored in the memory card and the capacity data (m) of the memory card are both stored.

In such a device, when the system is started and the memory card 1 is inserted, the CPU 12 detects this [5-1] and controls the memory card control section 15.
is controlled to read several bytes from the first address to detect the capacity of the memory card 1 [5-2], and further based on the amount of image data constituting one screen that is stored in advance,
Maximum number of screens that can be stored on memory card 1 (m)
Calculate [5-3]. Next, the CPU 12 determines the image reduction rate (n) as the minimum value of the integer N such that N2≧m [5-4]. Next, the CPU 12 detects the number of stored images (P) from the memory card 1 [5-5], and calculates the image reduction rate (n'
) as the minimum value of the integer N such that N2≧P [5-
6]. Next, the CPU 12 checks whether the image reduction rate (n) is equal to the image reduction rate (n') [5-7]. Here, if the image reduction ratio (n) is not equal, the reduction screen forming circuit 16
[5-
8]. Furthermore, the CPU 12 provides the image reduction ratio (n') to the reduced screen forming circuit 16, and stores the reduced image data in the second set of RAMs 3' to 5' as explained in [3-5] of FIG. [5-9] If n and n' are equal, only [5-9] is performed. In this way, [5-
7] to [5-9], and when the completion of reduction of all images is detected [5-10], the CPU 12 controls the RAM control unit 14 using a predetermined method.
by controlling the first or second set of RAMs 3 to 5,
The image data is read out from 3' to 5', and is supplied to D/A conversion circuits 6 to 8 to be converted into analog data, and then to matrix circuits 9 and N.
An NTSC signal is generated by a TSC encoder 10 and an adder 11. This NTSC signal is given to a television monitor device (not shown), and the image data is read out and reproduced on a multi-screen basis. Through the processing described above, when the capacity of the memory card 1 is large but the number of stored images (number of screens) is small, it is possible to recognize from the display how much free space is available, and also to display the number of stored images. It has the advantage of being able to be viewed at an appropriate size.

Next, an embodiment will be described in which the same advantages as described above can be obtained even if there is only one set of RAMs 3 to 5 as shown in FIG. The configuration of this image display device is as shown in FIG. 1, and the CPU 12 is previously provided with a program of the flowchart shown in FIG. 6, which is activated in the index display mode. Further, in an area of several bytes from the start address of the memory card 1, capacity data (m) and the number of stored images (P) of the memory card 1 are stored.

Depending on this embodiment, the operations [6-1] to [6-8] in FIG. 6 are executed when the memory card is first installed, and as explained with reference to FIG. 2, the storage capacity of the memory card 1 is Multi-screen playback is performed with the reduction ratio changed accordingly. An input means such as a keyboard (not shown) is equipped with an end key and a screen switching key.
U12 monitors these key operations. Therefore, when the end key is operated, [6-9] ends and the index display mode is ended, and when the switch key is operated, [6-9] ends.
6-10], and processes from [6-11] to [6-16] in FIG. Multi-screen playback is performed. Then, by operating the end key, the [6-17] index display mode is ended, and by operating the switching key, [6-18] and again [6-2]
] From then on, multi-screen playback is performed with the reduction ratio changed according to the storage capacity of the memory card 1.

FIG. 7 shows an image display device according to another embodiment of the present invention. The configuration of the image display device according to this example is as follows:
Each R stores decoded and expanded R, G, and B image data.
Three AMs (not three physically, but three address spaces) 3, 3', 3", 4, 4', 4", 5, 5'
, 5", the configuration is the same as that of the image display device shown in FIG. When the number of images that can be stored in the memory card 1 becomes enormous, each image is reduced to a recognizable level and reproduced on a multi-screen. The number of images stored in the memory card (P) and the capacity of the memory card are set in the area of several bytes from the start address of memory card 1. Data (m) are also stored.

In such a device, when the system is started up and the memory card 1 is inserted, the CPU 12 detects this [8-1] and processes from [8-2] to [8] in FIGS. 8 and 9.
-9], if n and n' are different as explained with reference to FIG.
and the second set of RAMs 3' to 5' store image data with different reduction ratios, and when n and n' are equal, the image data of the reduction ratio n is stored in the second set of RAMs 3' to 5'. is memorized. Furthermore, in this embodiment, the CPU 12 has n''<n'
A predetermined reduction ratio (n”) is set, and the third
The image data reduced by this reduction ratio (n") for two screens (n") is stored in the RAMs 3'' to 5'' of the sets [8-10] [8-11]. Here, n'' is, for example, 2,
3, which is a reduction ratio that allows the content of the image to be recognized on the divided screen. And CPU12
When detecting completion of reduction of all images [8-12], R
Controls the AM control section 14, and controls the first set of RAM3.
~5, 2nd set of RAM 3' to 5', 3rd set of RAM
The image data is read out by a predetermined method from 3'' to 5'', and is supplied to D/A conversion circuits 6 to 8 to be converted into analog data. Analog image data is provided by matrix circuit 9, NT
The signal is converted into an NTSC signal by the SC encoder 10 and the adder 11, and is applied to a television monitor (not shown) for multi-screen reproduction [8-13]. Here, the predetermined method is, for example, changing the set of RAMs from which image data is read at regular intervals, and displaying a split screen using image data with different reduction ratios. Further, there is a possibility that only a part of the image stored in the memory card 1 is stored in the third set of RAMs 3'' to 5''. Therefore,
The CPU 12 reads (n'') 2 images from the memory card 1 while the multi-screen playback cycle using the image data in the third set of RAMs 3'' to 5'' is running.
The image is reduced at a reduction rate (n'') and stored in the RAMs 3'' to 5''. This allows the image to be divided and displayed in a size that is easy to recognize.

Next, an embodiment will be described in which the same advantages as described above can be obtained even when there is only one set of RAMs 3 to 5 as shown in FIG. The configuration of this image display device is as shown in FIG. 1, and the CPU 12 is previously equipped with a program in which the flowchart in FIG. 10 is inserted into part B of the flowchart shown in FIG. 6, and is started in the index display mode. . Further, in an area of several bytes from the start address of the memory card 1, capacity data (m) and the number of stored images (P) of the memory card 1 are stored. Depending on this embodiment, when the memory card 1 is first installed,
The operation is executed by [6-1] to [6-8] of
As explained with reference to FIG. 2, multi-screen playback is performed in which the reduction ratio is changed depending on the storage capacity of the memory card 1. An input means such as a keyboard (not shown) is equipped with an end key and a screen switching key, and the CPU 12 monitors the operations of these keys. Therefore, when the end key is operated, it becomes [6-9] End, and the index display mode is ended, and when the switch key is operated, [6-10],
Perform the processing from [6-11] to [6-16] in Figure 6,
As explained with reference to FIG. 3, multi-screen playback is performed in which the reduction ratio is changed according to the number of images stored in the memory card 1. Then, by operating the end key, [6-
17] The index display mode is ended, and by operating the switching key [6-18] As shown in FIG.
”) to reduce the size of the third set of RAM3” to 5”
The reduced image data is stored in [10-1]. This storage operation is performed until the image data for (n'')2 screens are stored in the RAMs 3'' to 5'' [10-1]. When the CPU 12 detects the completion of reduction of all images [10-3], this R
Read image data from AM3” to 5” (n”)2
Perform multi-screen playback using split screens [10-4]. Then, when the CPU 12 detects the operation of the end key, [10
-5] When the index display mode is ended and the operation of the screen switching key is detected, [10-6] the process returns to [6-2] in FIG. 6 and the operation continues. If the screen switching key is not operated, return to [10-1] and select from memory card 1 (n”).
2. Read out the remaining image data that has not been reproduced in multi-screen mode using split screen, and perform the same processing thereafter.

[0031] The present invention is not limited to the above embodiments, but can be modified in various ways. For example, the number of screen divisions is 22, 32
, 42, . . . , but it is not limited to this, and can be changed as appropriate, for example, to 2 vertical screens x 3 horizontal screens. The CPU 12 applies the reduction ratio in both the vertical and horizontal directions to the reduced screen forming circuit 16 to perform sampling. Further, the video signal format is not limited to the NTSC format, and may be either PAL or SECAM format. Furthermore, the storage medium does not contain R, G, and B image data;
A luminance signal Y and color difference signals RY and BY may be stored. Further, the capacity data and image (side) number data of the memory card are not limited to the area of the embodiment, but may be any area that can be detected by the CPU 12. Furthermore, the RAM may be field memory.

[0032] In each embodiment, the normal screen (single screen)
Although the RAM for storing and multi-screens has been described as the same RAM, it is of course possible to have separate RAMs for single-screen and multi-screen. The storage medium is not limited to an IC memory card, but may also be a magnetic disk, magneto-optical disk, or optical disk. Alternatively, it may be a system that reads data from a storage medium via a transmitting/receiving device. In the embodiment, compressed image data was explained, but
It can also be applied to uncompressed data. Although data thinning has been described as a method for obtaining a reduced image, other known methods (for example, when the reduction rate is n,
(e.g., the average value of these pixels may be set as one pixel of the reduced image).

[0033]

[Effects of the Invention] As described above in detail, according to the present invention, the reduction ratio is changed according to the data storage capacity data read from the storage medium, so that the entire screen is put into a split screen. It is displayed as one screen and is suitable as an index, and if no image data is actually stored, the split screen is empty, allowing the user to know the storage status.

Furthermore, in the present invention, since the reduction rate is changed according to the number of screens read from the storage medium, all the screens related to storage are displayed at once, which is suitable for index display.

Further, according to the present invention, images reduced in size can be selectively displayed according to the data storage capacity data read from the storage medium or according to the number of screens, which is suitable for grasping the situation of empty areas. Not only that, but all the actually stored screens can be enlarged as much as possible and viewed at once, making it suitable as an index.

Furthermore, in the present invention, in addition to the above, it is possible to select a predetermined image reduction ratio larger than the above-mentioned image reduction ratio, which is suitable for viewing images of detailed parts in index display.

[Brief explanation of the drawing]

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

FIG. 2 is a flowchart illustrating the operation of an image display device according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating the operation of an image display device according to an embodiment of the present invention.

FIG. 4 is a configuration diagram of an image display device according to another embodiment of the present invention.

FIG. 5 is a flowchart illustrating the operation of an image display device according to another embodiment of the present invention.

FIG. 6 is a flowchart illustrating the operation of an image display device according to another embodiment of the present invention.

FIG. 7 is a configuration diagram of an image display device according to another embodiment of the present invention.

FIG. 8 is a flowchart illustrating the operation of an image display device according to another embodiment of the present invention.

FIG. 9 is a flowchart illustrating the operation of an image display device according to another embodiment of the present invention.

FIG. 10 is a flowchart illustrating the operation of an image display device according to another embodiment of the present invention.

FIG. 11 is a configuration diagram of a conventional image display device.

FIG. 12 is a diagram showing an example of a split screen.

FIG. 13 is a diagram showing a reduction method.

[Explanation of symbols]

1...Memory card 2...Decoder 3-5, 3'-5', 3"-5"...RAM6-8...D/
A conversion circuit 9 Matrix circuit 10 NTSC encoder 11 Adder 12 System control CPU 13 Timing generation circuit 14...RAM control unit 15...Memory card control unit 16...Reduced screen forming circuit 17...Switch circuit

Claims (4)

[Claims] Claims: 1. A storage medium in which image data for a plurality of screens are stored and data storage capacity data is stored, a reading means for reading data from the storage medium, and a reading means for reading data from the storage medium by the reading means. reduction rate determining means for determining an image reduction rate based on the data storage capacity data and the amount of image data for one screen; and image data of each screen read by the reading means in the image index display mode. a reduction means for creating reduced screen image data according to the image reduction ratio determined by the reduction ratio determination means; and reduction of multiple screens of images into one screen based on the reduced screen image data created by the reduction means. An image display device comprising display signal reproducing means for reproducing display signals of divided screens. 2. A storage medium in which image data for a plurality of screens is stored and image number data indicating how many screens the stored image data is, and a readout device for reading data from the storage medium. means for determining an image reduction rate based on the image number data read out from the storage medium by the reading means; a reduction means for creating reduced screen image data from the image data according to the image reduction rate determined by the reduction rate determination means; 1. An image display device comprising: display signal reproducing means for reproducing a display signal of a reduced and divided screen. 3. A storage medium storing image data for a plurality of screens, data storage capacity data, and image number data indicating how many screens of stored image data are stored, and a readout device for reading data from the storage medium. and a reduction method that determines an image reduction ratio based on the data storage capacity data and the amount of image data for one screen read out from the storage medium by the reading means, and on the basis of the number of images data. rate determining means, and creating reduced screen image data according to each image reduction rate determined by the reduction rate determining means from the image data of each screen read out by the reading means during the image index display mode. a reduction means; a selection means for selecting reduced screen image data reduced by any image reduction ratio from among the reduced screen image data reduced by the reduction means; and display signal reproducing means for reproducing a display signal of a screen in which images of a plurality of screens are reduced and divided into one screen. 4. A storage medium storing image data for a plurality of screens, data storage capacity data, and image number data indicating how many screens of stored image data are stored, and a readout device for reading data from the storage medium. and determining an image reduction ratio based on the data storage capacity data and the amount of image data for one screen read out from the storage medium by the reading means, and on the basis of the number of images data. , a reduction ratio determining means for determining a predetermined image reduction ratio larger than the image reduction ratio; and a reduction ratio determining means for determining a predetermined image reduction ratio that is larger than the image reduction ratio; a reduction means for creating reduced screen image data according to each image reduction ratio, and selecting reduced screen image data reduced by one of the image reduction ratios from among the reduced screen image data reduced by the reduction means. An image display characterized by comprising: a selection means; and a display signal reproduction means for reproducing a display signal of a screen in which images of a plurality of screens are reduced and divided into one screen based on the reduced screen image data selected by the selection means. Device.