JP3119374B2 - Image reverse playback method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003] However, since the amount of information is very large even though it is a still image, it is compressed by a compression encoding method so that it can be transmitted even in a narrow transmission band (or transmission rate) due to the limitation of communication capacity.

[0004] More specifically, since a still image is viewed by a viewer for a few seconds to several tens of seconds, a single image is viewed as 2
Transmission at a bit rate of about Mbps has been considered.

In transmitting image data, one screen control data is added to basic image information indicating one basic screen.

Here, the screen control data means display switching information for performing a method of switching from the previous screen to the next screen by using various patterns such as wipe, dissolve, scroll, and partial rewriting, in addition to the normal cut switching. And information indicating a screen display time, address information of a partially rewritten image, and the like. By using these screen control data, a variety of screen display methods have been devised so that programs can be enjoyed more. All or each of the screen control data is referred to as additional information for the basic screen in this specification.

[0007] The above-mentioned partial rewriting means that when only a part of the previously transmitted data of one screen is to be rewritten, the rewriting of the data of one screen is performed instead of transmitting new information of one screen. In this mode, the screen is rewritten by transmitting image data of only a part, and such partial image information is also referred to as accompanying information for the basic screen.

On the other hand, recently, large-capacity recording media, such as optical disks and magneto-optical disks, have become generally available, and the above-described still image files are recorded on the recording media as described above. It is also being conceived of a way to use it for playback.

[0009]

When the above-described recording / reproducing apparatus is used, special reproduction is required in addition to normal reproduction when viewed from the user side.

However, when the above-described image file is reproduced in the reverse direction, the compression-encoded data is reproduced in time series from the reverse direction, and the operation at the time of the screen switching is performed. It is difficult to perform the reproduction completely opposite to the normal reproduction. In particular, when there is a partial transmission mode, the partial screen is reproduced before the basic screen (an image for one screen), and a normal screen cannot be reproduced. Will be.

[0011] Such a problem is not limited to the above-described television signal, but commonly occurs when reproducing various other signals, for example, in a television conference.

[0012] The present invention has been made in consideration of the point described above, accompanying information to be reproduced by changing a part of the basic screen information and the basic screen indicating the basic screen is recorded, the accompanying information, the basic alphabet
By controlling the switching mode from the screen to another screen
Is the medium further containing control information that causes a predetermined screen effect?
An object of the present invention is to provide a method capable of performing favorable reverse reproduction without displaying an abnormal screen even during reverse reproduction in which reverse reproduction is performed .

[0013]

In order to achieve the above-mentioned object, a reverse screen for performing reverse playback from a medium on which basic screen information indicating a basic screen and accompanying information for changing and reproducing a part of the basic screen are recorded. A playback method, wherein the basic screen information is reproduced in advance before reverse playback, an image file including the basic screen information is created, and the accompanying information controls a mode of switching from the basic screen to another screen. In this case, control information for causing a predetermined screen effect is further included.

[0014] The incidental information may further include control information for generating a predetermined screen effect by controlling a mode of switching from the basic screen to another screen.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the technology to be improved in this embodiment will be described in detail with reference to the drawings.

FIG. 1 shows an example of the data structure when transmitting still image data. As shown in the figure, when transmitting still image data, one frame of transmission data is composed of “screen control data”, “image data”, and “audio data”, and one image data (audio data) is transmitted. Data) is added to one screen control data.

The "screen control data" in FIG. 1 is data describing 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 is performed by ordinary simple “cut switching” or wipe (wipe).
Controls such as dissolve for gradually switching from one screen to another screen, scrolling, and “partial rewriting” are provided. The “screen control data” is data indicating the type of screen control, data indicating a screen display mode, address information of a position to be rewritten when partial rewriting is performed, and the like. By using the "screen control data", the screen display method is diversified so that the screen can be enjoyed more.

When screen control such as wipe, dissolve, or scroll is performed, the transmitted "image data" FIG. 1 includes all image data of one screen. Will be. For convenience of explanation, a combination of "screen control data" and "image data" such that the image data includes all image data for one screen is referred to as "basic screen data".

On the other hand, the above-mentioned "partial rewriting" means that, regarding the transition from one screen to the next, only a part of the previously transmitted image data for one screen is rewritten. When the image data of the next screen can be obtained by using, instead of transmitting the image data of one screen of the next screen, the image data of only the rewritten portion is transmitted and the screen is rewritten. This is the mode in which it is performed. In the "partial rewriting" mode, the "image data" portion includes image data of only a portion related to rewriting. For convenience of explanation, the screen data used for this partial rewriting is as shown in FIG.
A combination of “screen control data” and “partial screen data” including an image to be changed is referred to as “associated information data” with respect to the above “basic screen data”. These two data are sequentially transmitted.

Therefore, when a series of transmitted images are recorded on such a recording apparatus, transmission data is recorded in the order of transmission. Then, the aforementioned “wipe” (wipe) or “dissolve” (desolv)
e) In the case of screen control such as "scroll", particularly "partial rewriting", the transmission sequence (in other words, the recording sequence) has a very important meaning. For example, when the basic screen A and the basic screen B are dissolved, the first transmitted is the “basic screen data” of the basic screen A, and the second transmitted is the basic screen data for the basic screen B. "Basic screen data". The above-described recording sequence is significantly important in the "partial rewriting" mode. For example, as shown in FIG. 2, the first screen X1 includes a circle, a triangle, and a square, and in the next screen X2, a square portion in the screen X1 is rewritten into a rectangle,
Further, in the next screen Y, the entire screen is switched to a screen having one large circle. As shown in FIG. 3, the sequence of the transmission data for such a screen control is as follows: first, data for the screen X1, data for rewriting, and then data for the screen Y are transmitted. Can be Since the data for rewriting partially rewrites the image on the screen X1, it is significant only after the image data for the screen X1.

When the recorded image is reproduced using a reproducing device or the like, when viewed from the user side, in addition to normal reproduction, for example, reverse reproduction (reproduction in order from the rear) is performed. Special playback may also be required. In the above-described reverse reproduction, if the recording device is an optical disk device, the head is sought in the reverse direction, and if the recording device is a magnetic tape device, the movement direction of the tape is reversed. In other words, in such trick play, the order of screens to be read from the recording device is different from the order at the time of recording. Therefore, in the trick play, in order to obtain a desired screen, it is necessary to search for a recording medium address on which the screen is recorded. However, it is difficult to realize a high-speed search of a recording medium address due to a limitation due to a reproduction rate of a recording medium, a time required for a decoding process, and the like.

Further, even if the high-speed search becomes possible, in the case of the reproduction in the reverse direction, the compression-coded data is reproduced in time series from the reverse direction. It is difficult to reproduce the operation at the time of screen switching completely opposite to the normal reproduction. In particular, in the case of rewriting a partial screen, the partial screen is reproduced before the basic screen (an image for one screen), and a normal screen cannot be reproduced.

This problem will be described more specifically with reference to the drawings.

FIG. 4 shows an example in which an image is recorded on the optical disk apparatus. In FIG. 4, the first track of the optical disk has "basic screen data" and "basic screen data" for the first to ninety-ninth screens. It is assumed that "partial screen data" is stored, and "basic screen data" and "partial screen data" for the 100th to 199th screens are stored in the second track. In the case of reverse reproduction, the read head seeks from the second track to the first track, but reads the screen data in the forward direction on the same track. Therefore, when reversely reproducing 100 screens on the first track, if there is no buffer capacity for 100 screens in the reproducing apparatus, the screen data of the 99th screen is read and reproduced, and the disc data is reproduced. , And then take the procedure of reading the screen data of the 98th screen and reproducing it, so that it takes a long time to search for the screen data. The biggest problem is the case where "partial screen data" is included in the screen data. When the first track of FIG. 4 is read from the 99th screen in the reverse direction, as shown in FIG. 5, the “basic screen data” of the 99th screen is read, and then as the 98th screen data of the 96th screen. Is read out, and then the 97th
The “partial screen data” for the 96th screen is read as the screen data, and the “basic screen data” for the 96th screen is then read as the 96th screen data. And
When the 98th screen and the 97th screen are to be reproduced, the rewriting is performed on the 99th screen, so that the rewritten screen has no meaning at all and becomes an abnormal screen.

Next, an example according to the present invention for solving such a problem will be described.

These two examples are both applied to a device for receiving and recording a broadcast still image and reproducing the recorded image. Further, the configurations of the playback devices in these two examples are substantially the same, and a functional block diagram of those devices is shown in FIG.

Both of these embodiments aim at preventing the occurrence of an abnormal screen and performing high-speed reproduction, particularly during "reverse reproduction", among the special reproductions targeted by the present invention.

In the control of both embodiments, during reverse reproduction or high-speed search, of the screen data read from the recording medium, the "partial screen data" is discarded and only the "basic screen data" is reproduced, whereby abnormal It prevents the occurrence of screens and also realizes high-speed playback. In the screen control of the first embodiment, at the time of reverse reproduction or high-speed search, all recorded screen information is read out, but the cause of generating an abnormal screen at the time of reverse reproduction or the speed-up of high-speed search is argued. The "partial screen data" is discarded, and the screen is displayed based on only the "basic screen data". On the other hand, in the screen control of the second embodiment, the medium address where the “basic screen data” is stored is stored in advance before recording or before special reproduction, and during reverse reproduction or high-speed search, the address data is stored in accordance with this address data. "Basic screen data"
"Partial screen data" by reading only
Is discarded, and the screen display is performed based on only the “basic screen data”. The difference in function between the two embodiments is mainly a result of the difference in control procedures, which will be described later with reference to the drawings.

Referring to FIG. 6, the structure of the reproducing apparatus 1000 according to the first and second embodiments will be described.

The reproducing apparatus 1000 has two operation modes: a receiving mode in which a still image broadcast is received and output as it is to the display apparatus 1100; and a recording / reproducing mode in which a received signal is temporarily recorded on a recording medium and then reproduced. 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”). Then, in the special playback mode, as described above,
There are “reverse playback mode” and “high-speed search mode”.

First, the configuration of the playback apparatus 1000 will be described by describing the flow of signals in an operation mode in which a still picture broadcast is received and output to the display apparatus 1100 as it is.

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 is, 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 is a signal composed of a CD, an “image data” ID, and an “audio data” VD. The “screen control data” CD and the “image data” ID may be collectively referred to as “basic screen image data”.

The decoding unit 202 decodes the compressed still image signal output from the receiving unit 201, converts the signal 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 frame units. 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 the read image data to the display device 1100 via the output terminal 205.

Next, a description will be given of the flow of data when the given still picture information is recorded once and then reproduced. In this case, the compressed still image information signal output from the receiving unit 201 is recorded in the magneto-optical disk device 206 as a recording medium in accordance with an instruction from the control unit 207. When reproducing the recorded image, the recording information in the magneto-optical disk device 206 is read out according to the instruction of the control unit 207, the information is processed if necessary, and this recording information is input to the decoding unit 202. The image information is output to the output terminal 205 in the same procedure as described above.

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

As is well known, the magneto-optical disk drive 206
Is a head 301 having a laser element 312 and a light receiving element 313, a servo circuit 305 for controlling the positioning operation (seek operation) of an arm supporting the head 301 and the arm 302, and a servo circuit 3 for performing tracking servo.
06, and a servo circuit 307 for performing focusing. Since these components are already well known, their description is omitted.

The control unit 207 includes the tracking control circuit 3
06, a focusing control circuit 307, a seek control circuit 308, and an R /
And a W control circuit 314. The control unit 207 further generates a mode control circuit 310 for determining whether to perform normal reproduction or special reproduction, and generates an address where data is written / read on the recording medium in accordance with the determined mode. Address generation control circuit 309 for controlling
And the data read by the light receiving element 313
And a decoding control circuit 315 for controlling whether or not to send the data to

The address file memory 316 in FIG.
It is used in the control of the second embodiment, and holds a medium address in which “basic screen data” is stored and reduced basic screen data obtained by reducing the basic screen data. It should be noted that data from the reducer 320 for reducing the output signal from the decoder 202 is output to the address file 316. The address register ADREG 317 is a register for storing a medium address where image data to be read by the control unit 207 is recorded. Similarly, the counter CNT 318 is used in the second embodiment, and is used to access the address file 316.

(Control Procedure of First Example) Hereinafter, a control procedure of the reverse playback mode in the first example will be described with reference to FIGS.

FIG. 9 shows how a recorded image having "basic screen data" and "partial screen data" is read and reproduced at the time of reverse reproduction in the case of following the control of the first embodiment. Is shown. In the figure, data from the first screen to the seventh screen are stored in this order on the magneto-optical disk, and the first screen, the fourth screen,
The fifth screen is stored as “basic screen data”, and the second, third, sixth, and seventh screens are stored as “partial screen data”. According to the control of the first embodiment, the data of the seventh screen → the data of the sixth screen → the data of the fifth screen → the data of the fourth screen → the data of the third screen → the data of the second screen → the data of the first screen The data is read out in the order of data.

Each time each screen data is read, it is determined whether the read screen data is "basic screen data" or "partial screen data" based on "screen control data". In the case of, decoding / reproduction is not performed, and decoding / reproduction is performed only in the case of “basic screen data”. Then, in the example of FIG. 9, "basic screen data" of the fifth screen → "basic screen data" of the fourth screen → "basic screen data" of the first screen are reproduced and displayed in this order. That is, since the "partial screen data" is discarded and only the "basic screen data" is reproduced, the partial screen is not rewritten for an erroneous screen described with reference to FIG. 5, so that no abnormal display occurs. .

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

First, in step S100 of the figure, the start address of reverse reproduction is set in the register ADREG. In step S104, the head 301 is sought to the start address, and a recording portion corresponding to the value of the register ADREG is searched. In step S106, the screen information block data recorded at the address is read. Here, the screen information block refers to a block including “image data”, “audio data”, and “screen control data” illustrated in FIG. In step S108, the head of the read screen information block is detected. Here, the detection of the “head” means that when one screen data spans a plurality of tracks, the head of the screen information block (that is, the screen control data) is on the next outer track, and the In order to read the control data, it is necessary to detect the head. Therefore, when one screen data does not extend over a plurality of tracks, the head of the data of one frame read in step S106 simply becomes the head of the block, but when one screen data extends over a plurality of tracks. Requires a seek to the next outer track. In addition, the detection of such a head is
The detection may be performed by detecting an identifier indicating screen control data in the data shown in FIG. 7, or may be detected simply by detecting a data break for one screen.

When the head is detected, in step S110, the screen control data CD in the block is read, and
At 104, it is determined whether the image data included in the screen information block is a "basic 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, a display start address SA and an end address EA of the image data on the screen are written in the image additional information AI. "Screen data" or "partial screen data" can be determined. That is, one screen is n
Xm pixels, the start address SA of the basic screen is (0, 0) and the end address EA is (n-
1, m-1). Therefore, when SA = (0,0) and EA = (n−1, m−1), the screen means “basic screen data”, and the additional screen that does not satisfy any one of the above relations Information AI
Means that the screen data has “partial screen data”.

As another determination method, a flag indicating “substrate screen data” or “partial screen data” is inserted in advance in the image additional information AI at the time of transmission, and the “ There is a method of determining “basic screen data” and “partial screen data”.

If it is determined that the image information is not "basic screen data", that is, if it is "partial screen data", the control skips steps S114 to S120 and proceeds to step S122. Proceed to. Thus, the "partial screen data" described with reference to FIG. 9 is skipped.

If it is determined in step S110 that the screen data read out in step S106 is "basic screen data", then in step S114, the "display switching information" DS contained in the screen control data CD
Referring to 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 any of “wipe”, “dissolve”, or “scroll”, for example, 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 proceeds to step S118.
The reason why the value of the switching information DS is always set to “0” for “basic screen data” is as follows. That is, in the present embodiment, since the “partial screen data” is skipped, the association between the videos between the “basic screens” is often lost. In such a case, the screen control data (DS ≠) for “wipe”, “dissolve”, “scroll”, etc.
Saving the original value of 0) and controlling its screen is as follows:
This is because the display screen is rather unsightly.

Further, special reproduction can be performed at a high speed in this manner. That is, in the case of "normal cut switching", the image is switched first.

Thus, in step S118, the screen control data CD and the image data ID are read in such a manner that DS is set to "0" in the screen control data. In step S120, the decoding operation of the image data ID is performed by the decoding unit 202.
Then, the image is reproduced according to the display switching information (DS = 0) in the cut switching mode.

In step S122, the address register A is read to read the immediately preceding image data block.
Decrement the content of DREG by one.

The above steps S104 to S12
The operation 2 is repeated until the reverse playback mode is canceled or the end of data is detected in step S124.

The above description is for the case of reproduction in the reverse direction. In the case of search in the forward direction, that is, in the case of "high-speed reproduction in the forward direction", the operation in step S122, ADREG-1 is performed. It may be changed to ADREG + 1. In this way, the display of only the basic screen ignoring the "partial screen data" is reproduced at high speed in the forward direction. Further, in the case of "normal forward reproduction", step S122 may be changed to ADREG + 1, and the control of steps S112 to S116 may be deleted.

In the special reproduction method of the first example described above, the screen control data section CD in the record information composed of the screen control data CD, the image data ID and the audio data VD is detected. Then, the screen control data section CD
Only when the additional information AI of the image included in the image control information indicates “basic screen data” composed of image data including all image information for one screen, Image data ID recorded as
And 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) to reproduce the image. Thus, at the time of reverse playback, the “partial screen data” composed of the image data ID including only a part of the image information in one screen is not reproduced, but includes all the image information of one screen. Only the "basic screen data" composed of the image data IDs
According to the aspect (DS = 0), the images are sequentially reproduced, and an abnormal image is not reproduced during reverse reproduction.

Further, at the time of high-speed search, only "basic screen data" is decoded and reproduced, and "partial screen data"
The search speed is increased by not displaying.

In the first example described above, at the time of trick play, it is determined in real time whether or not the read screen data is "basic screen data" information based on the value of the additional information AI in the screen data. Was like that. Therefore,
In the first example, it cannot be determined whether or not the data is "partial screen data" unless the data is read, so that even if the data is "partial screen data", it is always read. In the embodiment of the present invention described below, the reading of “partial screen data” is not performed, and the speed is further increased.

In this embodiment, as shown in FIG.
The address data on which the “basic screen data” information is recorded and the basic screen data are compressed, for example, and created as a search file before trick play. Then, when performing the special reproduction, the "partial screen data" is skipped by selectively reading out only the medium portion storing the compressed data corresponding to the "basic screen data" according to this file. . In the example of FIG.
The third, sixth, and seventh “partial screen data” are not read.

The address file is created in a memory indicated by 316 in FIG. 8 with a structure as shown in FIG. Address file access is counter CNT31
8 is performed. An address file is created and registered for each group of recorded images, and the address 0 (C
NT = 0) contains the number of records in the file (LNGT
H) At address 1 (CNT = 1), the first of the recorded image
The magneto-optical disk address where the second “basic screen data” is recorded is stored, and the address 2 (CNT = 1) is the address of the magneto-optical disk where the second “basic screen data” of the recorded image is recorded. Is stored, and address 3 (CNT =
1) stores the magneto-optical disk address where the third “basic screen data” of the recorded image is recorded.

It is desirable that the address file is created at least at the time prior to the special reproduction, for example, at the time of recording or reproduction or immediately before the special reproduction. Because, if created at the time of recording / reproduction or immediately before the special reproduction, the screen data to be recorded or the recorded screen data is checked in the forward direction to determine whether it is "basic screen data" or not. This is because the file can be created at high speed.

FIG. 13 is a flowchart showing a control procedure for creating such an address file when recording an image file. The control procedure of FIG.
Is started upon detecting that the recording of the still image broadcast is started, and is executed in parallel with the recording of the still image.

First, in step S202, the value of the physical address of the medium on which the received first screen information block is to be recorded is set in the register ADREG, thereby initializing this register. In step S204, the 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
Then, using this screen control data CD, the image data ID included in the screen information block is changed to “basic screen data”.
Is determined. This determination is the same as the method in step S112 of the first example.

If it is determined that the screen data to be recorded is not "basic screen data", step S21 is executed.
The process skips 0 and S212 and proceeds 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 “basic screen data”, the contents of ADREG are written to the address specified by the CNT of the address file 316 in step S210, and further reproduced. The compressed basic screen information is compressed and written as a reduced image, and ADREG is incremented by one in step S212.

The operations of steps S206 to S214 are repeated until it is determined in step S216 that the data recording has been completed.

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

As described above, the address information of the “basic screen data” and the reduced image file are created.

When the file of the address information is created after the recording is completed, for example, immediately before the trick play, the operations in steps S206 and S208 are performed according to the value set in the register ADREG. Then, the operation may be changed to an operation of reading the screen data from and reading the screen control data CD of the read screen data and determining whether or not the screen is the basic screen in step S208.

Next, the operation at the time of reverse playback in this embodiment will be described with reference to the flowchart of FIG.
The control procedure of FIG. 14 is started when the mode control unit 310 detects that the operator has selected reverse rotation reproduction.

First, in step S300, a recorded image to be trick-played is designated, and an address file corresponding to the recorded image is designated. In step S302, CNT is set to "0" in order to know the number of records in the address file. In step S304, address 0, that is, LNGTH is read. In step S306, LNGTH is set to the counter CNT. This allows
The address of the address file including the address information storing the last “basic screen data” of the recording image is set in the counter CNT.

In step S308, the address file and the reduced image data are read according to the value of the counter CNT. Then, in step S325, it is determined whether or not the search has been completed. If the search has been completed, the process returns to step S308 via step S324 if the process has branched to step S310.
-The operation of step S3244 is repeated.

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

In step S310, the 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
Search for the address at 14, and find the "basic screen data"
Read out.

The operations in steps S316 to S322 are the same as those in steps S114 to S120 in the first embodiment. That is, after changing the screen control mode to “normal cut switching” (DS = 0), the decoding unit 202 of “basic screen data” performs decoding / playback. In step S324, the value of the 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 basic screen is performed.

The above description is for the case of reproduction in the backward direction. However, in the case of search in the forward direction, step S3
02 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 "basic screen data" is recorded in advance before the special reproduction is filed, the special reproduction process is simplified. , Can be fast.

(Modification) In the above embodiment, the search was performed using the reduced image data for search. However, the present invention is not limited to this, and in this embodiment, FIG.
The operation may be performed according to the flow as shown in FIG.

The configuration of the reducer 320 in the present embodiment may be a DC component, for example, as long as it is DCT-transformed and compressed data, or may be simply information obtained by thinning out image data. In short, it is only necessary to compress the data to obtain reduced image data.

Next, the operation will be described with reference to the flowchart of FIG. The control procedure of FIG.
Is activated by detecting that the operator has selected reverse playback.

First, in step S300, a recorded image to be trick-played is designated, and an address file corresponding to the recorded image is designated. In step S302, CNT is set to "0" in order to know the number of records in the address file. In step S304, address 0, that is, LNGTH is read. In step S306, LNGTH is set to the counter CNT. This allows
The address of the address file including the address information storing the last “basic screen data” of the recording image is set in the counter CNT.

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

The operations in steps S316 to S322 are the same as those in steps S114 to S120 in the first embodiment. That is, after changing the screen control mode to “normal cut switching” (DS = 0), the decoding unit 202 of “basic screen data” performs decoding / playback. In step S324, the value of the counter CNT is decremented by one (CNT = CNT-1). Then, after step S324, the process returns to step S308, and 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.

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

The present invention can be variously modified without departing from the gist thereof.

For example, in the above two embodiments,
Although a magneto-optical disk is used as the recording medium 206, another memory such as a write-once optical disk or a dip-shaped or solid-state memory may be used. Further, the reproducing method is variously changed according to the type of the medium, and all such changes are included in the present invention.

In the above two embodiments, only the "basic screen data" is reproduced at the time of the special reproduction. However, the present invention is not limited to this. In addition to playing back "Basic screen data",
Modifications in which some accompanying information is reproduced are also included in the present invention.

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

As can be easily understood from the above description,
According to the present embodiment, there is no possibility that only an incomplete screen "partial screen data" is reproduced, or a disturbed screen such as an abnormal operation at the time of display switching is not reproduced.

Also, in the case of a forward search, only the "substrate screen data" which occupies the main part of the recorded image information is decoded, so the time required for reading, decoding and displaying the "partial screen data" The search can be performed at high speed by the minute.

[0090]

According to the present invention, when performing reverse playback from a medium in which basic screen information indicating a basic screen and accompanying information for changing and reproducing a part of the basic screen are recorded,
The accompanying information further includes control information for generating a predetermined screen effect by controlling a switching mode from the basic screen to another screen, and reproduces the basic screen information before reverse reproduction, Since the image file composed of the basic screen information is created, the reverse reproduction can be favorably performed.

[Brief description of the drawings]

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

FIG. 2 is a view for explaining the reason why a problem is caused by the related art.

FIG. 3 is a view for explaining the reason why a problem is caused by the related art.

FIG. 4 is a view for explaining the reason why a problem is caused by the related art.

FIG. 5 is a view for explaining the reason why a problem is caused by the related art.

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

FIG. 7 is a view for explaining a fort mat of image data processed in the embodiment.

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

FIG. 9 is a diagram showing a flow of a control operation of 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 a flow of a control operation according to an embodiment of the present invention.

FIG. 12 is a view for explaining the structure of an address file used for control in 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 unit 309 Address control 316 Address file 202 Decoder 320 Reducer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-318783 (JP, A) JP-A-63-58690 (JP, A) JP-A-63-184489 (JP, A) 72976 (JP, A) JP-A-4-295568 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/76-5/956

Claims (1)

(57) [Claims] 1. A reverse reproduction method for performing reverse reproduction from a medium in which basic screen information indicating a basic screen and accompanying information for changing and reproducing a part of the basic screen are recorded. reproducing the basic screen information, and creates an image file composed of the basic screen information, said satellite information is cut conversion from the basic screen to another screen
Control the shape of the screen to produce the desired screen effect
Reverse reproduction method , further comprising control information .