JPH0830393A - Device and method for reproducing and recording image data - Google Patents

Abstract

PURPOSE:To accelerate the reproduction of image data from a memory card. CONSTITUTION:A memory card 40 is provided with a storage area for storing image data and a header area for managing data. The data storage area is provided with plural clusters and the image data for one frame are stored in the plural clusters. The FAT of the header area manages cluster numbers as the addresses of clusters, and the clusters and the kinds of image data to be stored can be recognized by retrieving the FAT. When the reproduction is requested, it is found out by retrieving the FAT which cluster in the memory card 40 stores the image data of the reproduction requested frame. When the cluster numbers of all the clusters storing the image data for on requested for one requested for reproduction frame are found out, data expressing those cluster numbers are stored in a high-speed memory 11. While referring to the data expressing the cluster numbers stored in the high-speed memory 11, the image data are reproduced from the memory card 40 while controlling reading.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an image data reproducing apparatus for reproducing image data from a storage medium for storing image data and an image data recording apparatus for storing image data in such a storage medium.

[0002]

BACKGROUND OF THE INVENTION A memory card for storing image data includes a data storage area consisting of a large number of clusters. This cluster has a storage capacity of, for example, 8 kilobytes. Therefore, the image data for one screen does not fit in one cluster and is stored using a plurality of clusters. For this reason, it becomes necessary to store in which cluster the image data forming one screen is stored. Management of such clusters requires memory
It is performed in the data management area included in the card.

In a memory card having a data storage area and a data management area, when the data stored in the memory card is reproduced, the data management area is referred to and the first image data constituting one screen is stored. The address of the cluster being read is read. The image data stored in the cluster having the read address among the clusters included in the data storage area is read. Then, the address of the cluster in which the next image data is stored is read from the data management area, and the image data stored in the cluster having the read address is read out. The reading of the address from the data management area and the reading of the data from the cluster having the read address are repeated to read one screen of image data from the data storage area of the memory card. In this way, the reading of the address from the data management area and the reading of the data from the cluster having the read address are alternately repeated, and the image data for one screen is read from the memory card. I cannot hope for regeneration

Also in the data writing, the data management area is searched for an empty cluster, the data is written in the empty cluster, and the empty cluster is searched again, and the image data for one screen is stored in the memory.・ Since it is written on the card, quick image recording cannot be expected.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to quickly reproduce image data recorded on a recording medium and to rapidly record image data on the recording medium.

According to a first aspect of the invention, there is provided an image data storage area comprising a plurality of basic unit storage areas, in which one frame of image data is stored over the plurality of basic unit storage areas,
And an image from a storage medium having a data storage management area storing an address indicating in which basic unit storage area one piece of image data stored over a plurality of basic unit storage areas is stored. In a device for reproducing data, in response to a reproduction request for image data, an address for reading from the data storage management area all addresses of the basic unit storage area in which all of the requested one frame of image data is stored. The reading unit, the address storage unit for temporarily storing the address read by the address reading unit, and the basic unit storage area having the address read by reading the address stored in the address storage unit from the address storage unit The image data stored in is read from the data storage area and output. Characterized in that it comprises a data reading means.

The data reproducing method of the first invention comprises an image data storage area composed of a plurality of basic unit storage areas, in which image data of one frame is stored over a plurality of the basic unit storage areas, and a plurality of the basic storage areas. Apparatus for reproducing image data from a storage medium having a data storage management area for storing an address indicating in which basic unit storage area one piece of image data stored over the unit storage area is stored In response to the reproduction request of the image data, all addresses of the basic unit storage area in which all the image data of one frame requested to be reproduced are stored are read from the data storage management area, and the read addresses are read. Once stored, the stored address is read and stored in the basic unit storage area having the read address Image data, and outputs are read from the data storage area.

According to the first aspect of the invention, when there is a reproduction request for the image data recorded in the storage medium, all the addresses of the basic unit storage area in which all the image data of one frame requested to be reproduced are stored. Read and stored once. When data is reproduced, the address stored once is referred to and the data stored in the basic unit storage area is read.

An address is not read from the data storage management area every time image data is read from the basic unit storage area,
After temporarily storing all the addresses of the basic unit storage area in which all the image data of one frame requested to be reproduced are stored, the data stored in the basic unit storage area is referred to by referring to the once stored addresses. Read. Therefore, the image data read time can be shortened as compared with the case where the address is read from the data management area every time the image data is read from the basic unit storage area. Therefore, the reproduction of the image data from the recording medium can be speeded up.

Preferably, it is determined whether or not the read address is a continuous address, and in the address storing process, for the address determined to be a continuous address by the continuous address determination process, a start address and a final address of the continuous address and The identification data indicating that the area from the start address to the end address is continuous is stored.

As a result, the storage amount of addresses can be substantially reduced, and the efficiency of memory usage can be improved.

In the address storing process, the addresses read by the address reading means are sequentially stored from the high speed read memory, and the remaining addresses are stored in the standard read memory when the storage capacity of the high speed read memory is exceeded. .

As a result, the address once stored can be read at high speed, and the data can be reproduced more quickly.

A second aspect of the present invention is an image data storage area which is composed of a plurality of basic unit storage areas and in which one frame of image data is stored over the plurality of basic unit storage areas.
And image data in a storage medium having a data storage management area for storing an address indicating in which basic unit storage area one piece of image data stored over a plurality of basic unit storage areas is stored. In the recording device, an address reading means for reading, from the data storage management area, an address of an empty area of the basic unit storage area of the basic unit storage area included in the image data storage area and capable of storing one frame of image data. An address storage means for temporarily storing the address read by the address reading means, an address stored in the address storage means, and the address storage means in the basic unit storage area included in the data storage area. One frame of image data given to the above basic unit area having the read address. And a data storage management area updating means for newly storing in the data storage management area the address of the basic unit storage area in which the image data is written by the data writing means. It is characterized by being

A data recording method of the second invention comprises a plurality of basic unit storage areas, a data storage area in which one frame of data is stored over a plurality of the basic unit storage areas, and a plurality of the basic unit storages. An apparatus for recording data on a storage medium having a data storage management area for storing an address indicating in which basic unit storage area the data of one frame stored over the area is stored. In the basic unit storage area included in the above-mentioned basic unit storage area, an address of an empty area of the basic unit storage area of a number capable of storing one frame of image data is read from the data storage management area, and the read address is temporarily stored and stored. The address is read, and one of the basic unit storage areas included in the data storage area has the read address. A base unit area, writes the image data of one frame supplied, characterized in that it newly stored in the data storage management area addresses of the base unit memory area where the image data is written.

According to the second aspect of the present invention, the number of empty area addresses in the basic unit storage area of the basic unit storage area, which can store one frame of image data, is read from the data storage management area and temporarily stored. . When the image data to be recorded is given, the vacant area address of the basic unit storage area that has been stored once is read and written in the basic unit storage area which is the empty area. When the image data is written in the basic unit storage area, the address of the basic unit storage area in which the data is written is newly stored in the data storage management area. When data is written in a plurality of the basic unit storage areas, all addresses of the basic unit storage areas in which the data are written are newly stored in the data storage management area.

Each time image data is recorded in the basic unit storage area, the data storage management area is searched, and the free basic unit storage area is not searched for. The number of addresses of the basic unit storage areas that can store the image data is retrieved and stored. Therefore, the basic unit storage area in which the image data is to be written can be known and the image data can be written to the basic unit storage area only by referring to the address once stored. Therefore, the data writing time can be shortened and the recording of the image data on the recording medium can be speeded up.

Preferably, it is determined whether or not the read address is a continuous address, and in the address storing process, with respect to the address determined as the continuous address by the continuous address determination process, the start address and the final address of the continuous address and these addresses The identification data indicating that the area from the start address to the end address is continuous is stored.

As a result, the storage amount of addresses can be substantially reduced, and the efficiency of memory usage can be improved.

In the address storing process, the addresses read by the address reading means may be sequentially stored from the high speed read memory, and the remaining addresses may be stored in the standard read memory when the storage capacity of the high speed read memory is exceeded. .

As a result, the address once stored can be read at high speed, and the data can be recorded more quickly.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention and is a block diagram showing an electrical configuration of an image data recording / reproducing apparatus.

The entire operation of the image data recording / reproducing apparatus 15 is controlled by the CPU 10.

In the image data recording / reproducing apparatus 15 shown in FIG. 1, a subject is imaged and the image data obtained by the imaging is recorded in a memory card 40 which is detachably attached to the image data recording / reproducing apparatus 15. Imaging circuit section 20 for
And a reproduction circuit unit 30 for reproducing the image data recorded on the memory card 40 and displaying the image data on the monitor display device 50 detachably mounted on the image data recording / reproducing device.

The image of the subject is captured by the image pickup lens 21 to the CCD 22.
An image is formed on the light receiving surface of. As a result, a video signal representing the subject image is output from the CCD 22 and given to the preprocessing circuit 23.

The pre-processing circuit 23 includes an amplifier circuit, a gamma correction circuit, etc., and amplifies the input analog video signal, performs processing such as gamma correction, and outputs it. The analog video signal output from the preprocessing circuit 23 is converted into digital image data in the analog / digital conversion circuit 24.

The digital image data converted by the analog / digital conversion circuit 24 is applied to the Y / C processing circuit 25. Digital image data is Y / C processing circuit 25
The color data composed of the luminance data and the color difference data of RY and BY are generated in the Y / C processing circuit 25. The luminance data and color data generated in the Y / C processing circuit 25 are data compression circuits.
26, and data compression processing is performed by Huffman coding, run length coding, etc.

The data-compressed digital image data is given to the memory card 40 and recorded. The recording process of digital image data on the memory card 40 will be described in detail later.

When reproducing the image data recorded on the memory card 40, the image data recorded on the memory card 40 is read. The process of reading out the image data will also be described in detail later.

The digital image data recorded in the memory card 40 is given to the reproducing circuit section 30 via the interface 14.

The digital image data has a data expansion circuit 31.
Data is decompressed. The digital image data subjected to the data expansion is given to the digital / analog conversion circuit 33 via the Y / C processing circuit 32 and converted into an analog video signal. The analog video signal converted in the digital / analog conversion circuit 33 is given to the post-processing circuit 34.

In the post-processing circuit 34, processing such as amplification of the analog video signal is performed and output. Post-processing circuit
The analog video signal output from 34 is applied to the monitor display device 50 via the connector 34. As a result, the image represented by the image data recorded on the memory card 40 is displayed on the monitor display device 50.

FIG. 2 shows the data format of the memory card 40 mounted on the data recording / reproducing apparatus 15.

The memory card 40 includes a data storage area (image data storage area) 40B for storing image data, a header area (data management area) 40A for managing the image data stored in the data storage area 40B. It consists of

The data storage area 40B is composed of a plurality of clusters (basic unit storage areas) 44. For example, one cluster 44 has a storage capacity of 8 kilobytes. A cluster number is given to each cluster 44 as an address. Since the amount of image data for one frame is comparatively large, one cluster 44 alone cannot store image data for one frame. Therefore, the image data for one frame is stored in the memory card 40 using the plurality of clusters 44. In the memory card 40 shown in FIG. 2, cluster numbers “2”, “4”, “8”,
"9", "A", "B", "C", "D" and "E"
Image data for one frame is recorded by using the cluster 44 having.

The header area 40A has a header 41 and a FAT.
(File Allocation Table) 42 and directory 43 are included.

In the header 41, the storage capacity of one cluster, the number of FATs included in the memory card 40, FA
The size of T, the size of the directory, and the like are stored.

The FAT 42 is a map for indicating in which cluster and in what order the image data forming one frame is stored. The FAT 42 also manages empty areas of clusters and defective clusters.

An example of FAT 42 is shown in FIG. The FAT shown in FIG. 3 is constructed in units of 16 bits. In FIG. 3, the first two data "FFF9" are F
This is an identification code indicating that it is an AT. The third and subsequent data are codes that indicate the status of the cluster corresponding to the cluster number. For example, the third data “0004” shows the status of the cluster with cluster number 2, the fourth data shows the status of the cluster with cluster number 3, and the fifth data shows the status of the cluster with cluster number 4. Shows.

Since the image data for one frame has a large amount of data, it is stored using a plurality of clusters 44. For this reason,
It is necessary to know in which cluster 44 the image data of the same frame is stored, and in what order it is necessary to read the image data stored in the cluster 44. FAT42 is also used for this grasp.

For example, in FIG. 3, since the third data has a code of "0004", the cluster number 2 has already stored the image data, and the cluster number 4 has one frame worth of data. It is shown that the remaining image data among the image data is stored.
As a result, looking at the cluster number 4, that is, the fifth data, the fifth data is "0008",
Further, it can be seen that the remaining image data is stored in the cluster of cluster number 8. In this way, the data "FFF" indicating the cluster in which the last data is stored
When the FAT is searched until "E" is found, "0002", "0004", "0008", "000" in the example of FIG.
9 ”,“ 000A ”,“ 000B ”,“ 000C ”,
Data of "000D", "000E" and "FFFE" are obtained. Therefore, as the cluster number, 2,
The image data for one screen is stored in the cluster having 4, 8, 9, A, B, C, D, and E.

In this way, the image data stored in the data storage area is managed by the FAT.

The directory 43 stores the image data (file name), the update date and time of the image data, the head cluster number of the cluster in which the first image data of the image data for one frame is stored, the data amount of the image data, and the like. Remembered

Referring to FIG. 1, the data recording / reproducing apparatus 15 includes a high speed memory 11 and a low speed memory 12. The high-speed memory 11 is a high-speed memory for writing and reading data, and the low-speed memory 12 is a low-speed memory for writing and reading data. These memories 11 and 12 are controlled by the CPU 10 as to which memory to use and whether to write or read data.

In the data recording / reproducing apparatus 15 shown in FIG. 1, when the image data obtained from the image pickup circuit section 20 is recorded in the memory card 40, a cluster of empty areas having an amount enough to store one frame of image data. Cluster number of
It is read from the FAT 42 of the memory card 40. The read cluster number is given to the high speed memory 11 and is also stored in the low speed memory 12 when the storage capacity of the high speed memory 11 becomes over. The image data obtained by imaging is stored in the cluster of the empty area by referring to the high speed memory 11 or the low speed memory 12 as necessary.

In the data storage / reproduction device 15, a memory
When playing back the image data stored in the card 40,
All the cluster numbers of the clusters in which the image data requested to be reproduced are stored are FAT42 of the memory card 40.
Read from. Read cluster number is high speed memory
11, when the storage capacity of the high-speed memory 11 is over, it is also given to the low-speed memory 12 and temporarily stored. Fast memory
11 or refer to slow memory 12 if necessary
The image data is read from the card 40, given to the reproduction circuit section 30, and reproduced.

FIG. 4 shows a data recording / reproducing apparatus 15 shown in FIG.
5 is a flowchart showing a processing procedure of recording and reproducing image data in FIG.

An identification signal representing reproduction or recording of image data is given to the digital recording / reproducing device 15 from an input device (not shown). In the case of reproducing image data, a signal representing a frame to be reproduced is also given from the input device to the data recording / reproducing device 15.

First, reproduction of image data will be described.

When reproducing image data (step 6)
1) The reproduction frame is specified from the signal representing the frame to be reproduced, which is given from the input device (step 62).

When the piece to be reproduced is specified, the directory 43 of the memory card 40 is searched to find the cluster number of the cluster in which the first image data of the piece to be reproduced is stored. When the cluster number of the cluster 44 in which the first image data of the frame to be reproduced is stored, the data representing this cluster number is given to the high speed memory 11 and stored. Continued FA of memory card 40
T42 is searched, and the cluster numbers of the clusters 44 in which the remaining image data of the frame to be reproduced are stored are sequentially searched. When the cluster number of the cluster 44 in which the remaining image data of the frame to be reproduced is stored is searched, data representing the cluster number is sequentially stored in the high speed memory 11 each time the cluster number is searched (step 63).

When the high-speed memory 11 overflows (YES in step 64), the low-speed memory use flag 13 is set (step 65), and the cluster number found in the FAT 42 of the memory card 40 is the low-speed memory 12. Are sequentially stored in the memory (step 66).

In this way, the data representing the cluster numbers of all the clusters in which the image data of the frames to be reproduced are stored are stored in the high speed memory 11 or the low speed memory 12.

When the high speed memory 11 or the low speed memory 12 stores data representing the cluster number of the cluster 44 in which the image data of the frame to be reproduced is stored,
Data representing the cluster number is read from 11 and the low-speed memory 12, and image data stored in the cluster 44 having the cluster number specified by the read data representing the cluster number is sequentially read from the memory card 40.

When all the image data stored in the cluster 44 having the cluster number specified by the data representing the cluster number stored in the high speed memory 11 is read from the memory card 40, the low speed memory use flag 13
Is referred to. When the flag 13 is set, it means that the low speed memory 12 is also used, so that the data representing the cluster number stored in the low speed memory 12 is read. The image data stored in the cluster 44 having the cluster number specified by the data representing the cluster number stored in the low speed memory 12 is read from the memory card 40 (step 75). Further, the flag 13 is reset (step 76).

The image data read from the memory card 40 is given to the reproduction circuit section 30 and subjected to reproduction processing. As a result, the desired image is displayed on the monitor display device 50.

Data representing the cluster numbers of all the clusters 44 in which the image data of the frames to be reproduced are stored are stored in the high speed memory 11 or the low speed memory 12 as required, and these memories 11 or 12 are referred to. Since the reading of the image data from the memory card 40 is controlled, the image data can be read quickly.

Next, recording of image data on the memory card 40 will be described.

When image data is recorded on the memory card 40 (step 61), the FAT 42 of the memory card 40 is
Will be searched. As shown in FIG. 3, in FAT42, the code of "0000" is given to the cluster in the empty area. Therefore, the cluster number of the cluster 44 having the code "0000" is found and sequentially stored in the high speed memory 11 until the number of image data for one frame can be stored.

When the high speed memory 11 overflows (YES in step 72), the low speed memory use flag 13 is set (step 73), and the cluster number searched for from the FAT 42 of the memory card 40 is the low speed memory 12. Are sequentially stored in (step 74).

In this way, the data representing the cluster numbers of all the clusters capable of storing the image data for one frame is stored in the high speed memory 11 or the low speed memory 12.

When the high-speed memory 11 or the low-speed memory 12 stores the data representing the cluster numbers of all the clusters 44 capable of storing the image data for one frame, the image of the subject is picked up from the image pickup circuit section 20. The image data obtained is the cluster specified by the data representing the cluster number stored in the high speed memory 11 or the low speed memory 12.
Sequentially stored in 44.

Even if all the data is stored in the cluster 44 having the cluster number specified by the data representing the cluster number stored in the high speed memory 11, the image data for one frame obtained by imaging is stored in the memory card. When not stored in 40, the low speed memory use flag 13 is referred to.
When the flag 13 is set, it means that the low speed memory 12 is also used, and therefore the image data is stored in the cluster 44 specified by the data representing the cluster number stored in the low speed memory 12 ( Step 7
Five). As a result, all the image data for one frame obtained by shooting is stored in the memory card 40. Further, the flag 13 is reset (step 76).

FIGS. 5 to 7 are flow charts for reproducing image data and recording image data by a processing procedure different from the processing procedure shown in FIG.

In the processing procedure shown in FIGS. 5 to 7,
When even a part of the image data for one frame is stored in the clusters of consecutive cluster numbers, the data representing all the cluster numbers of consecutive cluster numbers is transferred to the high-speed memory 11 and the low-speed memory 12. Of the continuous cluster numbers, the data of the first cluster number, the data of the last cluster number, and the continuous identification data indicating that the data is continuous from the first cluster number to the last cluster number are stored in the high-speed memory 11 And stored in the low speed memory 12. Here, for convenience of description, a case where only the high speed memory 11 is used will be described.

First, a processing procedure when image data obtained by picking up an image of a subject is recorded in the memory card 40 will be described.

Referring to FIG. 5, when the image data is recorded on memory card 40, data recording / reproducing device 15 is supplied with a signal indicating the writing of the image data from the input device (step 81). Subsequently, the continuous identification data is initialized (step 82).

The FAT 42 of the memory card 40 is searched,
The smallest cluster number among the clusters in the empty area is searched for (step 83). The data representing the found cluster number is given and stored in the high speed memory 11 (step 84).

Referring again to FIG. 6, FAT42 is searched again,
The next smallest cluster number among the clusters 44 in the empty area is searched (step 85). It is judged whether or not the found cluster number is consecutive with the previously found cluster number (step 86), and when they are consecutive, continuous identification data is set (step 87).

When the cluster numbers found from the FAT 42 are no longer continuous or there are no continuous cluster numbers in the empty area (NO in step 86), it is determined whether or not continuous identification data is set (step 8).
9).

When the continuous identification data is set, the data indicating that the clusters in the empty area are continuous are stored in the high speed memory 11 (step 90). As this data, data that is not normally used in FAT42, for example, "GGGG" is used.

Next, a cluster of continuous image data
44 consecutive clusters, if stored in 44
The data representing the cluster number of the last cluster 44 of is stored in the high speed memory 11 (step 91).

When the state in which the continuous identification data is reset is held (NO in step 89), the cluster number representing the cluster number of the cluster 44 in the empty area found by searching the FAT 42 is stored in the high speed memory 11. It is stored (step 92).

In the cluster 44 representing the cluster number stored in the high speed memory 11, it is judged whether all the image data obtained by photographing cannot be stored (step 93). When it is determined that all the image data cannot be stored (YES in step 93), the continuous identification data is reset and the processing of steps 85 to 92 is repeated again. When it is determined that all the image data can be stored (NO in step 93), the image data obtained by imaging is sequentially stored in the cluster having the cluster number represented by the data representing the cluster number stored in the high speed memory 11. To be done. Image data is in memory card 40, cluster 44
The data of the cluster number of the cluster stored in the FAT 42 is updated.

Next, a processing procedure for reading and reproducing image data from the memory card will be described.

At the time of reproducing the image data, the data recording / reproducing device 15 is supplied with a signal representing the reproduction of the data and a signal representing the reproduction frame (FIG. 5, step 81).

Referring to FIG. 7, when the data recording / reproducing device 15 is supplied with a signal representing data reproduction, the continuous identification data is initialized (step 101). Continue memory
The directory 43 of the card 40 is searched for the cluster number of the cluster 44 in which the first data of the image data of the designated reproduction frame is stored. Data representing the found cluster number is given to the high speed memory 11 and stored (step 102). For example, in the example shown in FIGS. 2 and 3, the first data of the image data of the reproduction frame is stored in the cluster of cluster number 2, and the cluster number 2 is read from the directory 43 and stored in the high speed memory 11. .

The FAT 42 is searched to find a cluster in which the data following the first data of the image data of the reproduction frame is stored (step 103). It is determined whether the cluster numbers of the found clusters are consecutive (step 104). If the cluster numbers are continuous, continuous identification data is set (step 105).

Steps 103 and 103 are repeated until the cluster numbers of the clusters storing the image data of the reproduction frames are not continuous.
The process of 104 is repeated.

A cluster 44 storing image data of reproduction frames
Cluster numbers of are not consecutive (N in Step 104)
O), it is judged whether or not the continuous identification data is set (step 106). If the continuous identification data is set (YES in step 106), the continuous identification data is stored in the high speed memory 11 (step 107). Data representing the final cluster number of the consecutive cluster numbers is stored in the high speed memory 11 (step 108). If the continuous identification data holds the reset state (NO in step 106), the cluster number of the cluster 44 found in the search of the FAT 42 is stored in the high speed memory 11 (step 109).

If the data representing the cluster numbers of all the clusters 44 in which the image data of the reproduced frame is stored is not stored in the high speed memory 11 (NO in step 110),
The continuous identification data is reset (step 111), and the processing from step 103 to step 110 is repeated.

When the data representing the cluster numbers of all the clusters 44 in which the image data of the reproduced frames are stored are stored in the high speed memory 12 (YES in step 110), the cluster numbers stored in the high speed memory 11 are changed. Image data is read from the cluster 44 of the memory card 40 with reference to the cluster number represented by the data. The image data read from the memory card 40 is given to the reproducing circuit unit 30, reproduced and output.

For example, in the example shown in FIGS. 2 and 3,
Image data for one frame is stored in the clusters of cluster numbers 2, 4, 8, 9, A, B, C, D, E and F. Therefore, the cluster number data in which the image data for one frame is stored is “0002”, “0004”,
"0008", "0009", "000A", "000"
B ”,“ 000C ”,“ 000D ”and“ FFFE ”
Becomes However, since the cluster numbers are continuous from "0008" to "FFFE", the leading cluster number "0008", the last cluster number "FFFE" of these consecutive cluster numbers, and the leading cluster number to the last cluster number " The continuous identification data “GGGG” indicating that up to FFFE ”is continuous is a high-speed memory.
Remembered in 11. That is, in the example shown in FIGS. 2 and 3, “0002”, “0004”, “0008”, “GG”
"GG" and "FFFE" are stored in the high speed memory 11,
The reproduction control of the image data is performed with reference to the stored data. Therefore, at least the overflow of the storage capacity of the high speed memory 11 is prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a data recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 shows a data format of a memory card.

FIG. 3 shows the contents of a FAT on a memory card.

FIG. 4 is a flowchart showing a procedure for reproducing and recording image data.

FIG. 5 is a flowchart showing another processing procedure of reproduction and recording of image data.

FIG. 6 is a flowchart showing another processing procedure of reproduction and recording of image data.

FIG. 7 is a flowchart showing another processing procedure of reproduction and recording of image data.

[Explanation of symbols]

 10 CPU 11 High-speed memory 12 Low-speed memory 15 Data recording / reproducing device

Claims (12)

[Claims] 1. Comprised of a plurality of basic unit storage area,
In which basic unit storage area is stored an image data storage area in which one frame of image data is stored over a plurality of the basic unit storage areas and one frame of image data stored over a plurality of the basic unit storage areas. In a device that reproduces image data from a storage medium having a data storage management area that stores an address indicating whether or not all of the image data of one frame requested to be reproduced in response to a reproduction request for the image data. Address reading means for reading all the stored addresses of the basic unit storage area from the data storage management area, address storage means for temporarily storing the addresses read by the address reading means, and the address storage means. Read the address from the address storage means, and read the read address as well. The image data stored in the basic unit storage area, the image data reproducing apparatus having a data reading means for outputting reads from the image data storage area. 2. A continuous address judging means for judging whether or not the address read by the address reading means is a continuous address, and the address storing means has a continuous address judging means for the addresses judged as continuous addresses by the continuous address judging means. 2. The image data reproducing apparatus according to claim 1, which stores a start address and a final address of continuous addresses and identification data indicating that the start address and the final address are continuous. 3. The address storage means includes a high-speed read memory and a standard read memory whose read speed is slower than that of the high-speed read memory, and the addresses read by the address read means are stored in order from the high-speed read memory. The image data reproducing apparatus according to claim 1, wherein the remaining addresses are stored in the standard read memory when the storage capacity of the read memory is over. 4. A storage unit comprising a plurality of basic unit storage areas,
In which basic unit storage area is stored an image data storage area in which one frame of image data is stored over a plurality of the basic unit storage areas and one frame of image data stored over a plurality of the basic unit storage areas. In an apparatus for recording image data in a storage medium having a data storage management area for storing an address indicating whether or not there is a number of image data for one frame among the basic unit storage areas included in the data storage area. Address reading means for reading an empty area address of the basic unit storage area from the data storage management area, address storage means for temporarily storing the address read by the address reading means, and address stored in the address storage means , Of the basic unit storage areas included in the image data storage area, Data writing means for writing one frame of image data to the basic unit area having the address read from the address storage means, and the basic unit storage area for writing the image data by the data writing means. An image data recording device comprising a data storage management area updating means for newly storing an address in the data storage management area. 5. A continuous address judging means for judging whether or not the address read by the address reading means is a continuous address, and the address storing means has a continuous address judging means for the addresses judged to be continuous addresses by the continuous address judging means. 5. The image data recording apparatus according to claim 4, which stores a start address and an end address of continuous addresses, and identification data indicating that the start address and the end address are continuous. 6. The address storage means includes a high-speed read memory and a standard read memory having a read speed slower than that of the high-speed read memory, and addresses read by the address read means are stored in order from the high-speed read memory. 5. The image data recording apparatus according to claim 4, wherein the remaining addresses are stored in the standard read memory when the storage capacity of the read memory is over. 7. A plurality of basic unit storage areas,
In which basic unit storage area is stored an image data storage area in which one frame of image data is stored over a plurality of the basic unit storage areas and one frame of image data stored over a plurality of the basic unit storage areas. In a device that reproduces image data from a storage medium having a data storage management area that stores an address indicating whether or not all of the image data of one frame requested to be reproduced in response to a reproduction request for the image data. All the addresses of the stored basic unit storage area are read from the data storage management area, and the read addresses are temporarily stored,
A method for reproducing image data, comprising reading a stored address, reading image data stored in the basic unit storage area having the read address from the image data storage area, and outputting the read image data. 8. A determination is made as to whether or not the read address is a continuous address, and the address storing process determines the start address and the final address of the continuous address for the addresses determined to be the continuous addresses by the continuous address determination process, and these addresses. 8. The image data reproducing method according to claim 7, wherein the identification data indicating that the area between the first address and the last address of the item is continuous is stored. 9. The address storing process sequentially stores addresses read by the address reading process from a high-speed read memory, and the remaining addresses are stored in a standard read memory when the storage capacity of the high-speed read memory is exceeded. To do. The image data reproducing method according to claim 7. 10. An image data storage area composed of a plurality of basic unit storage areas, in which one frame of image data is stored over a plurality of the basic unit storage areas, and is stored over a plurality of the basic unit storage areas. 1
In a device for recording image data in a storage medium having a data storage management area for storing an address indicating in which basic unit storage area the image data of a frame is stored, in the above-mentioned image data storage area, Of the basic unit storage area, the number of empty area addresses of the basic unit storage area that can store one frame of image data is read from the data storage management area, the read address is temporarily stored, and the stored address is read, Of the basic unit storage area included in the image data storage area, the given one frame of image data is written in the basic unit area having the read address, and the basic unit storage area in which the image data is written is written. An image data recording method for newly storing an address in the data storage management area. 11. A determination is made as to whether or not the read address is a continuous address, and the address storing process determines a start address and a final address of the continuous address and an address determined as a continuous address by the continuous address determination process. 11. The image data recording method according to claim 10, wherein identification data indicating that the area from the start address to the end address is continuous is stored. 12. The address storing process sequentially stores addresses read by the address reading process from a high-speed read memory, and the remaining addresses are stored in a standard read memory when the storage capacity of the high-speed read memory is exceeded. The image data recording method according to claim 10, wherein