JPH04345387A - Picture reproducing method - Google Patents

Abstract

PURPOSE:To execute a satisfactory reproduction without reproducing an abnormal screen at the time of a specific reproduction by preliminarily reproducing basic screen information before the specific reproduction, for example, a backward reproduction or a reproduction for retrieval, and preparing a picture file constituted of the basic screen information CONSTITUTION:Address data in which basic screen data information are recorded, and the basic screen data are, for example, compressed so as to be prepared as a file for retrieval before the specific reproduction. An address file is prepared and registered for the recorded picture of one group, and the number of records of the file is stored in the 0 address (CNT=0) of each file, and a magneto-optical disk address in which the first basic screen data of the recorded picture are recorded is stored in the first address (CNT=1). The magneto-optical disk address in which the second basic screen data of the recorded picture are recorded is stored in the second address (CNT=2), and the magneto-optical disk address in which the third basic screen data of the recorded picture are recorded is stored in the third address (CNT=3).

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduction method, and more particularly to a method for special reproduction of image data.

0002

2. Description of the Related Art First, a television signal will be described as an example to which the method of the present invention is applied. In recent years, the development of still image files using high-definition television signals has been progressing.

However, even though it is a still image, it contains an extremely large amount of information, and due to communication capacity limitations, it is compressed using a compression encoding method so that it can be transmitted even with a narrow transmission band (or transmission rate).

Specifically, since it is a still image and the time for a viewer to view one image is from several seconds to more than ten seconds,
Transmission at a bit rate of about Mbps is being considered.

Furthermore, when transmitting image data, one piece of screen control data is added to base image information indicating one base screen.

[0006] Screen control data here refers to display switching information for switching from the previous screen to the next screen using various patterns such as wipe, dissolve, scroll, or partial rewriting in addition to normal cut switching. , information indicating screen display time, address information for partially rewritten images, etc. By using these screen control data, screen display methods are made more diverse and programs are designed to be more enjoyable. In this specification, all or each of the screen control data is referred to as accompanying information for the basic screen.

[0007] The above-mentioned partial rewriting is when you want to rewrite only a part of the previously transmitted screen of data, instead of transmitting a new screen of information. This is a mode in which the screen is rewritten by transmitting only partial image data, and such partial image information is also referred to as accompanying information for the base screen.

On the other hand, recently, large-capacity recording media, such as optical disks and magneto-optical disks, have become generally available, and still image files such as those described above can be recorded on such recording media and used as needed. Other uses are also being considered, such as playing it back.

[0009]

SUMMARY OF THE INVENTION When using the recording and reproducing apparatus described above, from the user's perspective, special reproduction is required in addition to normal reproduction.

However, in the case of recording and reproducing still image files as described above, it is difficult to realize a high-speed search due to limitations such as the recording and reproducing rate of the recording medium and the time required for decoding processing. Also, when considering playback in the reverse direction, it is not possible to play back compressed encoded data chronologically in the reverse direction, and to play back the above-mentioned screen switching operation in the complete opposite of normal playback. This is difficult, and especially when there is a partial transmission mode, the partial screen is played back before the base screen (one screen worth of images), and a normal screen cannot be played back.

[0011] Such problems occur not only in the above-mentioned television signals, but also in common when reproducing various other signals, such as in the case of television conferences.

SUMMARY OF THE INVENTION In view of the above-mentioned points, it is an object of the present invention to provide a method that can perform high-speed and good reproduction without causing abnormal screens to be reproduced even during special reproduction.

[0013]

[Method for Solving the Problems] In order to achieve the above-mentioned object, the method of the present invention is a reproduction method for reproducing from a medium in which basic screen information indicating a base screen and accompanying information for the base screen are recorded, An image reproducing method characterized in that the base screen information is reproduced in advance before special reproduction, and an image file consisting of the base screen information is created.

[0014]

[Embodiment] First, the technology to be improved in this embodiment will be further explained in detail with reference to the drawings.

FIG. 1 shows an example of a data structure when transmitting still image data. As shown in the figure, when transmitting still image data, one frame of transmission data consists of "screen control data", "image data" and "audio data", and one image data (audio data) is transmitted. One screen control data is added to each screen data).

"Screen control data" in FIG. 1 is data that describes a method of controlling a screen, and usually describes a method of controlling a screen when switching from one screen to the next screen. In still image broadcasting, screen control includes the usual simple "switching cuts" or wipes, dissolves or scrolls that gradually switch from one screen to another, and even scrolling. provides controls such as "partial rewriting". The "screen control data" includes data indicating the type of screen control, data indicating the mode of screen display, address information of a position to be rewritten when performing partial rewriting, and the like. By using this "screen control data," the screen can be displayed in a variety of ways, making the screen more enjoyable.

[0017] When the above-mentioned screen control such as wipe, dissolve, or scroll is performed, the "image data" to be transmitted, as shown in FIG. 1, includes all the image data of one screen. It turns out. For convenience of explanation, a combination of "screen control data" and "image data" in which the image data includes all image data for one screen is called "base screen data."

On the other hand, the above-mentioned "partial rewriting" simply rewrites only a part of the previously transmitted image data for one screen regarding the transition from one screen to the next screen. If the image data for the next screen can be obtained, the screen is rewritten by transmitting only the image data for the rewritten part, instead of transmitting the image data for one screen of the next screen. This is the mode that allows you to do this. In the case of this "partial rewriting" mode, the "image data" portion includes image data only for the portion related to rewriting. For convenience of explanation, the screen data used for this partial rewriting is a combination of "screen control data" and "partial screen data" including the image to be changed, as shown in FIG. 1B. ” versus “
This is called "associated information data." Both of these data are transmitted sequentially.

Therefore, when a series of transmitted images are recorded on such a recording device, the transmitted data are recorded in the order in which they are transmitted. Then, the above-mentioned "wipe" and "desolve"
) or "scroll", especially in the case of screen control such as "partial rewriting", the transmission sequence (in other words, the recording sequence) has an extremely important meaning. For example, when base screen A and base screen B are dissolved, the "base screen data" for base screen A is sent first, and the "base screen data" for base screen B is sent next. This is "base screen data." The above-mentioned recording sequence becomes particularly important in the "partial rewriting" mode. For example, as shown in Figure 2, the first screen
contains circles, triangles, and squares, and in the next screen X2, the square part in screen X1 is rewritten to a rectangle, and in the next screen Y, the entire screen is switched to a screen with one large circle. There is. The sequence of transmission data for screen control is as shown in Figure 3. First, data for screen X1 is sent, then data for rewriting is sent, and then data for screen Y is sent. It will be done. Since the rewriting data partially rewrites the image of the screen X1, it is meaningful only after the image data for the screen X1.

By the way, when playing back images once recorded using a playback device etc., from the user's perspective, in addition to normal playback, for example, reverse playback (playback from the back) is possible. Special regeneration may also be required. In the above-mentioned reverse playback, if the recording device is an optical disk device, the head is caused to seek in the reverse direction, and if the recording device is a magnetic tape device, the moving direction of the tape is reversed. In other words, in such special reproduction, the order of the screens to be read from the recording device is different from the order at the time of recording. Therefore, in special reproduction, in order to obtain a desired screen, it is necessary to search for the recording medium address on which the screen is recorded. However, it is difficult to realize a high-speed search for a recording medium address due to limitations such as the playback rate of the recording medium and the time required for decoding processing.

[0021] Furthermore, even if high-speed retrieval becomes possible, in reality, in the case of reverse playback, compression-encoded data must be played back chronologically from the reverse direction, and the above-mentioned It is difficult to reproduce the operation at the time of screen switching in the exact opposite manner to normal reproduction. In particular, in the case of rewriting a partial screen, the partial screen is played back before the base screen (one screen worth of images), and a normal screen cannot be played back.

[0022] Such problems will be explained in more detail with reference to the drawings.

FIG. 4 shows an example in which images are recorded on an optical disc device. In the figure, the first track of this optical disc contains "base screen data" for the 1st screen to the 99th screen and " It is assumed that "partial screen data" is stored, and "base screen data" and "partial screen data" for the 100th to 199th screens are stored in the second track. In the case of reverse playback, the reading head seeks from the second track to the first track, but reads screen data in the forward direction on the same track. Therefore, when reproducing 100 screens on the first track in reverse, if the playback device does not have buffer capacity for 100 screens, it will read the screen data of the 99th screen, play it back, and transfer it to the disc. It is necessary to wait for one rotation of the screen, then read the screen data of the 98th screen and reproduce it, and as a result, it takes time to search for the screen data. The biggest problem is when screen data includes "partial screen data." When the first track in FIG. 4 is read in the reverse direction from the 99th screen, as shown in FIG.
is read out, then "partial screen data" for the 96th screen is read out as the 98th screen data, then "partial screen data" for the 96th screen is read out as the 97th screen data, and then "Base screen data" for the 96th screen is read out as the 96th screen data. And the 98th
When an attempt is made to reproduce the 97th screen, the rewriting is performed on the 99th screen, so the rewritten screen has no meaning at all and becomes an abnormal screen.

Next, an example of the present invention that solves this problem will be explained.

Both of these two examples are applied to devices that receive and record broadcast still images and reproduce the recorded images. Furthermore, the configurations of the playback devices in these two examples are generally the same, and a functional block diagram of these devices is shown in FIG.

These two embodiments are both intended to prevent the occurrence of an abnormal screen and to achieve high-speed playback, especially during "reverse playback", which is the special playback to which the present invention is directed.

The control of both embodiments is such that during reverse playback or high-speed search, out of the screen data read from the recording medium, ``partial screen data'' is discarded and only ``base screen data'' is reproduced. This prevents the screen from occurring and also achieves high-speed playback. In the screen control of the first embodiment, during reverse playback or high-speed search, all the recorded screen information is read out, but there are " This method discards "partial screen data" and performs screen display based only on "base screen data." On the other hand, the second
In the screen control of the embodiment, the medium address where the "substrate screen data" is stored is saved in advance before recording or special playback, and during reverse playback or high-speed search, the "substrate screen data" is stored according to this address data. '' from the medium, the screen is displayed based only on the "base screen data" and the "partial screen data" is discarded. The functional differences between the two embodiments are primarily a result of differences in control procedures, which will be explained later in accordance with the drawings.

The configuration of the reproducing apparatus 1000 according to the first and second embodiments will be explained with reference to FIG.

This playback device 1000 has two operation modes: a reception mode in which a still image broadcast is received and output as is to the display device 1100, and a recording/playback mode in which the received signal is once recorded on a recording medium and then played back. There is. The recording/playback mode includes a special playback mode and a forward normal speed playback mode (hereinafter referred to as "normal playback mode"). And, as mentioned above, in the special playback mode,
There are ``reverse playback mode'' and ``high-speed search mode.''

First, the configuration of the playback device 1000 will be explained by explaining the flow of signals in an operation mode in which a still image broadcast is received and output as is to the display device 1100.

In FIG. 6, a receiving circuit 20 outputs a compressed still image information signal to a decoding circuit 202. Here, the compressed still image information signal means, for example, as shown in FIG. 7, image information for one screen is "screen control data" including "screen display switching information" DS and "image additional information". This signal is composed of a CD, an "image data" ID, and an "audio data" VD. Furthermore, the "screen control data" CD and the "image data" ID may be collectively referred to as "basic screen image data."

[0032] The decoding section 202 decodes the compressed still image signal output from the receiving section 201, converts it into original still image data, and outputs it. The image data decoded by the decoding unit 202 is stored in the frame memory 203 in units of frames. The screen control unit 204 reads the image data stored in the memory 203 according to the "screen control data" transmitted together with the "image data" and outputs it to the display device 1100 via the output terminal 205.

Next, the flow of data when provided still image information is once recorded and then reproduced will be explained. In this case, the compressed still image information signal output from the receiving unit 201 is transmitted to the magneto-optical disk device 2 as a recording medium.
06, according to instructions from the control unit 207. When reproducing a recorded image, the recorded information in the magneto-optical disk device 206 is read out according to the command from the control unit 207, the information is processed if necessary, and the recorded information is sent to the decoding unit 2.
02, and thereafter outputs the image information to the output terminal 205 in the same procedure as described above.

FIG. 8 shows the configuration of the control section 207 and the configuration of the magneto-optical disk device 206.

As is well known, the magneto-optical disk device 206 includes a head 3 having a laser element 312 and a light receiving element 313.
01, an arm that supports the head 301, and arm 3
A servo circuit 305 that controls the positioning operation (seek operation) of 02, and a servo circuit 30 that performs tracking servo.
6, and a servo circuit 307 that performs focusing. Since these components are already well known, their explanation will be omitted.

The control section 207 controls the tracking control circuit 3
06, a focusing control circuit 307, a seek control circuit 308, and an R/
W control circuit 314. The control unit 207 further includes a mode control circuit 310 that determines whether to perform normal playback or special playback, and generates addresses on the recording medium where data is written/read according to the determined mode. an address generation control circuit 309 that performs control to
It has a decoding control circuit 315 that controls whether or not to send the data read by the light receiving element 313 to the decoding unit 202.

The address file memory 316 in FIG.
It is used in the control of the second embodiment, and holds the medium address where the "base screen data" is stored and the reduced base screen data obtained by reducing the base screen data. Note that data from a reducer 320 for reducing the output signal from the decoder 202 is output to the address file 316. Further, the address register ADREG 317 is a register that stores the address of a medium on which image data that the control unit 207 attempts to read is recorded. Similarly, counter CNT 318 is used in the second embodiment and is used to access address file 316.

(Control procedure of first example) Below, FIGS. 9 and 10
Accordingly, the control procedure of the reverse playback mode in the first example will be explained.

FIG. 9 shows how a recorded image having "base screen data" and "partial screen data" is read and reproduced during reverse playback when the control of the first embodiment is followed. This shows how it works. In the figure, data from the first screen to the seventh screen is stored in this order on the magneto-optical disk, and the data from the first screen to the fourth screen is stored in this order.
The fifth screen is stored as "base screen data", and the second, third, sixth, and seventh screens are stored as "partial screen data". According to the control of the first embodiment, data on the seventh screen → data on the sixth screen → data on the fifth screen → data on the fourth screen → data on the third screen → data on the second screen → data on the first screen Data is read in order.

Each time each piece of screen data is read, it is determined whether the read screen data is "base screen data" or "partial screen data" based on "screen control data", and the read screen data is determined as "partial screen data". In this case, it is not decoded/reproduced, and only in the case of "base screen data", it is decoded/reproduced. Then, in the example of FIG. 9, the "base screen data" on the fifth screen → "base screen data" on the fourth screen → "base screen data" on the first screen are played back and displayed in this order. That is, since the "partial screen data" is discarded and only the "base screen data" is reproduced, the partial screen is not rewritten for the erroneous screen as explained in relation to FIG. 5, so no abnormal display occurs. .

FIG. 10 is a flowchart showing the control procedure in the reverse playback mode in the first embodiment. This control procedure is activated when the mode control section detects that the operator has instructed reverse playback.

First, in step S100 in the figure, the start address of reverse playback is set in the register ADREG. In step S104, the head 301 seeks this start address to search for the recorded portion corresponding to the value of the register ADREG. In step S106, the screen information block data recorded at the address is read. Here, the screen information block refers to a block composed of "image data", "audio data", and "screen control data" shown in FIG. In step S108, the beginning of the read screen information block is detected. Here, detection of the "head" means that when one screen data spans multiple tracks, the beginning of the screen information block (i.e., screen control data) is on the outer track, so the screen In order to read the control data, it is necessary to detect the beginning. Therefore, when one screen data does not span multiple tracks, the beginning of one frame of data read in step S106 simply becomes the beginning of the block, but when one screen data spans multiple tracks , it is necessary to seek to the track one track outside. In addition, such detection of the beginning is as follows.
This may be done by detecting an identifier indicating screen control data from among the data shown in FIG. 7, or by simply detecting a break in one screen's worth of data.

When the beginning is detected, in step S110, the screen control data CD in the block is read out, and
In step 104, it is determined whether the image data included in the screen information block is a "base screen" or a "partial screen" based on the additional information AI (see FIG. 7) of the image included in the screen control data CD.

As shown in FIG. 7, the display start address SA and end address EA of the image data on the screen are written in the image additional information AI, and these values indicate that the image information is "substrate". It is possible to determine whether the data is "screen data" or "partial screen data." In other words, one screen is n
When the base screen is composed of ×m pixels, the start address SA of the base screen is (0,0), and the end address EA is (n-1
, m-1). Therefore, if SA = (0, 0) and EA = (n-1, m-1), that screen means "base screen data" and any additional information that does not satisfy either of the above relationships Information AI
This means that screen data having "partial screen data" is "partial screen data".

[0045] As another determination method, it is possible to include in advance in the image additional information AI whether "substrate screen data" or "
There is a method such as inserting a flag indicating whether the data is "partial screen data" and determining whether it is "base screen data" or "partial screen data" based on the determination of the relevant bit.

If it is determined that the image information is not "base screen data", that is, if it is "partial screen data", the control skips steps S114 to S120 and returns to step S122. Proceed to. In this way, the "partial screen data" described in connection with FIG. 9 is skipped.

If it is determined in step S110 that the screen data read out in step S106 is "base screen data", then in step S114, the "display switching information" DS included in the screen control data CD is
(FIG. 7), the value of DS is compared with "0". If the switching information DS does not indicate "normal cut switching" (DS≠0), that is, if it indicates one of "wipe", "dissolve", or "scroll", step Proceeding to S116, the value of the display switching information DS is rewritten to a value meaning "normal cut switching". That is, DS=0. On the other hand, if the switching information DS indicates "normal cut switching" (DS=0), the process directly advances to step S118. The reason why the value of the switching information DS is always set to "0" for the "base screen data" is as follows. That is, in this embodiment, since "partial screen data" is skipped, there are many cases where the relationship between images between "base screens" is lost. In such cases, screen control data (DS≠0) for "wipe", "dissolve", or "scroll" etc.
This is because if the original value of is saved and the screen is controlled using that value, the display screen will become unsightly.

Furthermore, by doing so, special playback can be performed at high speed. That is, the images are switched fastest in the case of "normal cut switching".

Thus, in step S118, the screen control data CD and image data ID are read out of the screen control data with DS set to "0". Then, in step S120, the decoding unit 202 performs the decoding operation of the image data ID.
Then, the image is reproduced according to the display switching information (DS=0) indicating the cut switching mode.

In step S122, address register A is used to read out the previous image data block.
Decrement the contents of DREG by one.

[0051] Steps S104 to S12 described above
The operation of step 2 is repeated until it is detected in step S124 that the reverse playback mode is canceled or that the data is finished.

The above is an explanation for the case of reverse playback, but in the case of forward search, that is, in the case of "forward high-speed playback", the operation in step S122, ADREG-1, Just change it to ADREG+1. In this way, the display of only the base screen, ignoring the "partial screen data", is reproduced at high speed in the forward direction. Furthermore, in the case of "normal forward playback", step S122 may be changed to ADREG+1, and the controls in steps S112 to S116 may be deleted.

The first example of the special playback method described above detects the screen control data section CD in the recorded information consisting of the screen control data CD, image data ID, and audio data VD. And the screen control data section CD
Only when the additional information AI of the image included in the image indicates that it is "base screen data" consisting of image data that includes all the image information for one screen, the image is paired with the screen control data ID. Image data ID recorded as
The information DS used for switching the screen display in the screen control data CD is changed to the normal cut switching mode (DS=0), and the image is reproduced. Thus, during reverse playback, the "partial screen data" consisting of image data IDs that contain image information for only a portion of one screen is not played back, but instead is played back. "
Only the "substrate screen data" is sequentially reproduced in the "normal cut switching" mode (DS=0), and no abnormal images are reproduced during reverse reproduction.

Furthermore, during high-speed search, only the "base screen data" is decoded and reproduced, and the "partial screen data"
The search speed increases by the amount that is not displayed.

In the first example described above, during special playback, whether or not the read screen data is "base screen data" information is determined in real time based on the value of the additional information AI in the screen data. That's what I was doing. Therefore, in the first example, it cannot be determined whether or not it is "partial screen data" unless it is read out, so even if it is "partial screen data" it is always read out. The embodiment of the present invention to be described next is designed to further increase speed by not reading out "partial screen data".

In this embodiment, as shown in FIG.
For example, the address data in which the "base screen data" information is recorded and the base screen data are compressed and created as a search file before special playback. Then, when special playback is performed, the "partial screen data" is skipped by selectively reading out only the portion of the medium in which compressed data corresponding to the "base screen data" is stored according to this file. . In the example of FIG. 11, the second, third, sixth, and seventh "partial screen data" are not read out.

The address file is created in the memory indicated by 316 in FIG. 8 with a structure as shown in FIG. 12. Counter CNT31 is used to access the address file.
8. An address file is created and registered for each group of recorded images, and address 0 (C
NT=0) contains the number of records in the file (LNGT
H), the first address of the recorded image (CNT=1) is
The magneto-optical disk address where the second "substrate screen data" is recorded is stored, and the second address (CNT=1) is the magneto-optical disk address where the second "substrate screen data" of the recorded image is recorded. is stored at address 3 (CNT=
1) stores the magneto-optical disk address where the third "substrate screen data" of the recorded image is recorded.

[0058] This address file is preferably created at least at a time prior to special reproduction, for example, during recording and reproduction or immediately before the special reproduction. This is because, if the screen data is created immediately before recording/playback or special playback, the screen data to be recorded or the recorded screen data must be checked in the forward direction to determine whether it is "base screen data". This is because files can be created quickly.

FIG. 13 is a flowchart showing a control procedure for creating such an address file when recording an image file. The control procedure in FIG.
is activated when it detects that recording of still image broadcasting starts, and is executed in parallel with recording of this still image.

First, in step S202, the register ADREG is initialized by setting in the register ADREG the value of the physical address of the medium on which the received first screen information block is to be recorded. In step S204, a counter CNT is set to "1",
Steps S206 to S214 are applied to all screen information blocks to be recorded. That is, in step S206, the screen control data CD of the block to be recorded is referred to, and in step S208
Now, use this screen control data CD to determine that the image data ID included in the screen information block is "base screen data".
Determine whether or not. This determination is the same as the method of step S112 in the first example.

[0061] If it is determined that the screen data to be recorded is not "base screen data", step S21
0, skipping S212 and proceeding to step S214, where the register ADREG is incremented by one. On the other hand, if it is determined in step S208 that the screen data to be recorded is "base screen data",
In step S210, the contents of ADREG are written to the address specified by CNT in the address file 316, and further,
The reproduced base screen information is compressed and written as a reduced image, and in step S212, ADREG is incremented by one.

The operations from step S206 to step S214 are repeated until it is determined in step S216 that data recording is completed.

When the end of the data to be recorded is detected in step S216, the number of records written to the address file is counted in step S218, and this counted value is written to address 0 (LNGTH) of the record file ( Step S220, Step S222). and,
In step S224, this file is registered as an address file.

As described above, the address information and reduced image file of the "base screen data" are created.

If the address information file is created after recording is completed, for example, immediately before special playback, the operations in steps S206 and S208 are performed on the magneto-optical disk according to the value set in the register ADREG. The operation may be changed to one in which the screen data is read from the screen data, the screen control data CD of the read screen data is then referred to, and it is determined in step S208 whether or not the screen is the base screen.

Next, the operation during reverse playback in this embodiment will be explained according to the flowchart shown in FIG. The control procedure shown in FIG. 14 is activated when the mode control unit 310 detects that the operator has selected reverse playback.

First, in step S300, a recorded image to be specially reproduced is specified, and an address file corresponding to the recorded image is specified. In step S302, CNT is set to "0" in order to know the number of records in the address file, and in step S304, address 0, ie, LNGTH, is read. In step S306, a counter CNT is set to LNGTH. As a result, the address of the address file containing the address information where the last "substrate screen data" of the recorded image is stored is set in the counter CNT.

In step S308, the address file and reduced image data are read in accordance with the value of the counter CNT. Then, in step S325, it is determined whether or not the search has ended, and if the search has ended and the process branches to step S310, the process returns to step S308 via step S324, and the process returns to step S308 as described above.
~Repeat the operations in step S3244.

If the search has been completed, the flow branches to S310.

In step S310, address data corresponding to the reduced image data at the time when the search is completed is AD
Set to REG. Therefore, steps S312 and S3
14 to search that address and find the "base screen data" there.
Read out.

The operations in steps S316 to S322 are the same as those in steps S114 to S120 of the first embodiment. That is, after changing the screen control mode to "normal cut switching" (DS=0), the "base screen data" decoding unit 202 is caused to decode/reproduce. In step S324, the value of counter CNT is decremented by one (CNT=CNT-1).

By decrementing the value of CNT one by one in step S324, a reverse search of the base screen is performed.

[0073] The above is an explanation for the case of reproduction in the reverse direction, but in the case of a search in the forward direction, step S3
The operation of step S324 is changed to CNT=1, and the operation of step S324 is changed to CNT=CNT+1.

According to the second embodiment described above, since the address where the "substrate screen data" is recorded is made into a file before special playback, the special playback process is simple and , can be made fast.

(Modified Example) In the above embodiment, the search was performed using reduced image data for search, but this is not limiting, and in this embodiment, the operation may be performed according to the flow shown in FIG. .

Further, the structure of the reducer 320 in this embodiment may be, for example, a DC component as long as the data is DCT-transformed and compressed data, or information obtained by simply thinning out image data. The point is that it is sufficient to compress the data and obtain reduced image data.

Next, the process will be explained according to the flowchart shown in FIG. The control procedure in FIG.
is activated by detecting that the operator has selected reverse playback.

First, in step S300, a recorded image to be specially reproduced is specified, and an address file corresponding to the recorded image is specified. In step S302, CNT is set to "0" in order to know the number of records in the address file, and in step S304, address 0, ie, LNGTH, is read. In step S306, a counter CNT is set to LNGTH. As a result, the address of the address file containing the address information where the last "substrate screen data" of the recorded image is stored is set in the counter CNT.

In step S308, the address file is read according to the value of the counter CNT. Step S3
10, the data read in step S308 is AD
Set to REG. If the read data value is n, this is the address where the nth "substrate screen data" is stored on the magneto-optical disk. Therefore, step S
312 and S314, the address is searched and the "substrate screen data" there is read out.

The operations in steps S316 to S322 are the same as those in steps S114 to S120 of the first embodiment. That is, after changing the screen control mode to "normal cut switching" (DS=0), the "base screen data" decoding unit 202 is caused to decode/reproduce. In step S324, the value of counter CNT is decremented by one (CNT=CNT-1). Then, through step S324, the process returns to step S308.
The operations of steps S308 to S324 described above are repeated.

According to this embodiment, a search can be performed without using reduced image data.

[0082] Also in this embodiment, a search in the forward direction can be performed in the same manner as described above.

The present invention can be modified in various ways without departing from the spirit thereof.

For example, in the above two embodiments,
Although a magneto-optical disk is used as the recording medium 206, other memories such as a write-once optical disk, a dip-type memory, or a solid-state memory may also be used. Furthermore, although the reproduction method may be changed in various ways depending on the type of medium, all such changes are included in the present invention.

Furthermore, in the above two embodiments, only the "base screen data" was reproduced during the special reproduction, but the present invention is not limited to this, and as long as all the "auxiliary information" is not reproduced, In addition to playing the "base screen data",
The present invention also includes a modification example in which part of the accompanying information is reproduced.

Furthermore, the structure of the screen data block is not limited to the structure shown in FIG.

As can be easily understood from the above explanation,
According to this embodiment, only "partial screen data" which is an incomplete screen is not reproduced, or a distorted screen such as abnormal operation when switching displays is not reproduced.

In addition, in the case of a forward search, only the "base screen data" that occupies the main part of the recorded image information is decoded, so the time required to read, decode, and display the "partial screen data" is reduced. This allows for faster searches.

[0089]

According to the present invention, good reproduction can be performed at high speed even during special reproduction.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a data format of a still image file to which the present invention is applied.

FIG. 2 is a diagram illustrating why problems occur with the prior art.

FIG. 3 is a diagram illustrating why problems occur with the prior art.

FIG. 4 is a diagram illustrating why problems occur with the prior art.

FIG. 5 is a diagram illustrating why problems occur with the prior art.

FIG. 6 is a block configuration diagram of a recording/reproducing apparatus according to a preferred embodiment of the present invention.

FIG. 7 is a diagram illustrating a format of image data processed in the above embodiment.

FIG. 8 is a block diagram of a control section of the recording/reproducing apparatus according to the embodiment.

FIG. 9 is a diagram showing the flow of control operations in an example according to the present invention.

FIG. 10 is a flowchart showing a control procedure according to FIG. 9;

FIG. 11 is a diagram showing the flow of control operations according to an embodiment of the present invention.

FIG. 12 is a diagram illustrating the structure of an address file used for controlling the embodiment of FIG. 11;

FIG. 13 is a flowchart showing a control procedure according to the embodiment of FIG. 11;

FIG. 14 is a flowchart showing a control procedure according to the embodiment of FIG. 11;

FIG. 15 is a flowchart showing a modification of FIG. 14;

[Explanation of symbols]

206 Disk device 207 Control section 309 Address control 316 Address file 202 Decoder 320 Reducer

Claims (2)

[Claims] 1. A reproduction method for reproducing from a medium in which basic screen information indicating a basic screen and accompanying information for the base screen are recorded, wherein the base screen information is reproduced in advance before special playback, and the base screen information is reproduced in advance. An image playback method characterized by creating an image file consisting of screen information. 2. The image playback method according to claim 1, wherein the special playback is reverse playback or search playback.