JPH1042255A - Moving picture recording device, recording medium and moving picture reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently reproduce only a specified frame by detecting a specified frame from an encoding picture data string and recording the position of the detected frame on a recording medium. SOLUTION: A reference frame detection circuit 11 retrieves the position of a header code showing the start of a reference frame arranged in the inputted data string. A table generation circuit 12 generates a reference table indicating a positional relationship in the data string of the reference frame based on the start position of the reference frame which is detected in the circuit 11. A recording conversion circuit 13 converts an input data string and recording conversion circuit 14 the reference table into forms where they can be recorded in the recording medium. A recording control circuit 16 executes control required for the recording of the recording medium. When reference frame information recorded in the table is referred to and data is skipped and reproduced at the reproduction, high speed reproduction is possible. When data is skipped and reproduced by skipping one piece, the two-fold reproduction of high speed reproduction is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving picture recording apparatus, a recording medium, and a moving picture reproducing apparatus, and more particularly to an MPE.
Digital moving image that is recorded or reproduced using an image data sequence generated by inter-frame coding using intra-frame coding and motion prediction, such as the G method or the H261 method, and compression coding using a variable length code. The present invention relates to a recording device, a recording medium, and a moving image reproducing device.

[0002]

2. Description of the Related Art MPEG2 (Motion P.M.) is used as an encoding method for encoding and recording moving images on a digital recording medium.
icture Coding Expert Group Phase 2, ISO / IEC 1381
8-2) has been standardized and widely used. This encoding method is used not only for recording information but also for broadcasting and communication fields such as digital broadcasting and digital transmission.

[0003] A moving image compression encoding system represented by MPEG2 is a system in which inter-frame encoding using intra-frame encoding and motion prediction and compression encoding using a variable length code are combined.

In the MPEG system, data is composed of an intra-frame coded frame for encoding within a frame and an inter-frame coded frame for performing data compression by referring to another frame and performing encoding. You.

[0005] An intra-coded frame is an I-Picture.
(Intra-Picture). The inter-coded frame includes a P-Picture (Predictive-Picture) that performs compression by referring to a past frame and a B-Picture (Bidirectional-Picture) that performs compression by referring to two past and future frames. ).

[0006] The P-Picture refers to the reference frame that is present in the past in the order of the reproduction time (the frame to be referenced, I-Picture or P-Picture), and the B-Picture is located in the nearest past. Encoding and decoding are performed by referring to an existing reference frame and a reference frame existing in the closest future.

FIG. 11 shows MPEG2 (ISO / IEC 1).
A reference relationship of frames in a method of performing compression encoding of an image by combining intra-frame encoding and inter-frame encoding represented by 3818-2) will be briefly described.

In the figure, reference numerals 101 to 110 all denote frames that are temporally continuous. Frames 101 and 110 indicated by I in the figure are I-Picture in MPEG2.
, And are frames that are encoded within the frame.
This frame is compressed only by image data encoded in the frame, that is, by a method capable of decoding in frame units.

[0009] Frames indicated by P and B in the figure are frames that are compressed by referring to other frames, performing motion compensation, and using data differences.

[0010] In the figure, the frame at the end point of the arrow indicates that compression is performed by referring to the frame at the start point of the arrow for motion or difference. In MPEG2, a frame referred to only from a past frame is called a P-Picture, and a frame referred to from past and future image data is referred to as a B-Pictur.
Called e. Frames 104, 1 indicated by P in the figure
07 is a P-Picture, a frame 102 indicated as B in the figure,
103, 105, 106, 108, 109 are B-Picture
Is shown. Then, the P-Picture performs compression by using the P-Picture or I-Picture that exists in the closest past in time as a reference frame, and the B-Picture compresses the past and future P-Picture or I-Picture. Compression is performed by reference.

For this reason, all frames up to the appearance of a frame 110, which is an I-Picture to be compressed in the next frame unit, directly or successively refer to the frame 101. Thereby, the frames 102 to 109
Will be compressed. Because of this, these P-Pictur
e and B-Picture are decoded by I-
This is not possible without first decoding the Picture. A plurality of frames 101 to 109 having such a reference relationship are collectively called a GOP (Group of Picture).

Further, in the MPEG system, a variable length code is adopted. Therefore, the data amount of each frame is not predetermined. For example, the average data amount per unit time in a long period such as a GOP period composed of a plurality of frames including one I-Picture, a sequence period composed of one or a plurality of GOPs, or one program period is reduced. It is only necessary to satisfy the predetermined value.

FIG. 12 is a diagram for explaining a change in the data amount for each frame. Generally, the amount of data is I-Pict
ure>P-Picture> B-Picture. However, even if the frames are encoded by the same method, the data amount is not constant.

As such a compression encoding method, IS
MPEG-2 (Motion Picture Coding Expert Gro)
up Phase 2, ISO / IEC 13818-2)
(Motion Picture Coding Expert Group, ISO 11172-2
H.), which is a videophone standard. The H.261 series typically exists.

FIG. 13 shows a configuration of a moving image recording apparatus for recording an image data sequence encoded by this encoding method on a recording medium.

As such a recording medium 15, it is possible to use various digitally recordable recording media such as an optical disk, a magnetic disk, and a magnetic tape.

The recording conversion circuit 13 performs processing necessary for recording on a recording medium, such as blocking, addition of an error correction code, and modulation, on the input data sequence.

The recording control circuit 16 is a control circuit for controlling recording of an image data sequence on the recording medium 15.

FIG. 14 shows a specific example of a moving image reproducing apparatus for reproducing a recording medium on which a data string is recorded in this manner.

The reproduction control circuit 63 is a control circuit for directly controlling reading from the recording medium 15. Reproduction conversion circuit 6
Reference numeral 1 denotes a circuit that performs processing for the processing performed in the recording conversion circuit 13 when writing to the recording medium 15, that is, processing such as demodulation, error correction, and block release.

The reference frame detecting circuit 91 is provided on the recording medium 15.
In order to reproduce only the reference frame in the special reproduction, for example, the high-speed reproduction, from the data string read out of the I-Picture, for example, a circuit for searching for the beginning and end of the I-Picture.

At the time of high-speed reproduction, when the reference frame detection circuit 91 finds the beginning of each frame and finds the beginning of the I-Picture, it instructs the buffer memory 62 to write the image data string of the frame, and then detects the end. The writing to the buffer memory 62 is stopped. Subsequently, the reference frame detection circuit 91 searches for the head of the image data sequence to be reproduced next. This operation is repeated.

The decoding circuit 66 reads the image data string from the buffer memory 62 and outputs it as a reproduced image.

As described above, the high-speed reproduction is performed by using the I-
This can be achieved by detecting the beginning of the Picture and playing back only the I-Picture.

[0025]

However, in the prior art, the process is complicated in order to find the head of each frame at the time of high-speed reproduction and determine which frame is an I-Picture. There are drawbacks. For this reason, there is a disadvantage that a device capable of reading at a very high speed is required. Furthermore, if the reading speed is not enough,
In some cases, the search speed cannot sufficiently follow the reproduction speed, causing a problem in the reproduced image, or the special reproduction cannot be performed.

[0026] In the reverse reproduction, a reading speed higher than the high-speed reproduction is required, which is a further problem. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to efficiently reproduce only a specific frame from an image data sequence coded in frame units by intra-frame coding or inter-frame coding. It is a first object of the present invention to provide a recording medium capable of reproducing the same and a reproducing apparatus therefor.

It is a second object of the present invention to provide a recording apparatus capable of recording a moving image on such a recording medium.

[0028]

In order to achieve the above-mentioned object, a moving picture recording apparatus according to the present invention uses a specific frame from an image data sequence coded on a frame basis by intra-frame coding or inter-frame coding. And a recording circuit for recording information for specifying the position of the detected frame in the image data sequence on a recording medium.

Further, the recording circuit stores the information in the first storage medium.
Is recorded as a table in the area. The moving image recording apparatus further includes an image data recording circuit that records the encoded image data sequence in the second area of the recording medium.

Further, the recording circuit records in a state where information is inserted into the image data sequence. Further, the information for specifying the position of the detected frame in the image data sequence is information indicating the start position of the specific frame.

Further, the information for specifying the position of the detected frame in the image data sequence is the distance between specific frames.

Further, the recording circuit records the time interval at the time of reproduction between specific frames.

Further, the recording means records the subordination relation in the encoding of the specific frame.

Here, the dependency relationship is a reference relationship, which is a dependency relationship between frames during encoding and reproduction.

Further, the image data sequence is a data sequence encoded by the MPEG system, and the detection circuit detects a header portion of the image data sequence.

Further, the image data string includes a meaningless code,
The recording circuit deletes the meaningless code and inserts and records the information.

According to another aspect of the present invention, a moving image recording apparatus outputs a first image data sequence encoded in frames by intra-frame encoding or inter-frame encoding for recording on a recording medium. And a second output circuit for outputting information for specifying the position of a specific frame included in the image data sequence for recording on a recording medium.

According to still another aspect of the present invention, the recording medium is a recording medium for recording image data composed of a plurality of frames, which is encoded by intra-frame encoding or inter-frame encoding. Has a portion for recording information for specifying a position where a specific frame is recorded.

According to still another aspect of the present invention, a moving picture reproducing apparatus includes a first reading circuit for reading information for specifying a position where a specific frame is recorded, and an image based on the read information. A second readout circuit for reading out a specific frame from a plurality of frames included in the data.

According to the present invention, it is possible to provide a recording medium and a reproducing apparatus capable of efficiently reproducing only a specific frame. This makes it possible to provide a recording medium and a reproducing apparatus that can perform trick play at high speed.

Further, it is possible to provide a moving image recording apparatus capable of efficiently recording moving images on such a recording medium.

[0042]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Circuits having the same functions are denoted by the same reference numerals, and description thereof will not be repeated.
In the embodiments, data in the MPEG2 system will be described as an example of a data string.

FIG. 1 is a block diagram of a moving image recording apparatus according to the first embodiment of the present invention.

The reference frame detection circuit 11 generates a reference frame (a frame referred to from another frame, i.e., I-Picture, P-Pict) arranged in an input data sequence.
ure) is a circuit that searches for the position of the header code indicating the beginning of the header code. For example, in the case of an MPEG2 data string, a sequence header, a GOP header, and a Picture
A start code indicating the start position of the upper layer additional information such as a header is inserted in the data string. These start codes are easily identifiable data. The reference frame detection circuit 11 detects these data. Each of the sequence header, the GOP header and the Picture header has a user data area.

After the Picture header, a motion prediction coding mode (I-Picture, P-Picture,
Or B-Picture) is arranged as data. Therefore, the start position of the reference frame can also be determined from the Picture header and the information indicating the form of the motion prediction encoding that follows. Also, GOP is immediately after the sequence header due to the hierarchical structure of encoding.
A header or a Picture header of the I-Picture exists, and a Picture header of the I-Picture exists immediately after the GOP header. Information necessary for frame reproduction is encoded and recorded in the sequence header and the GOP header.
Therefore, if the sequence header or GOP header is I-
If it exists before the Picture header of Picture, it can be detected as the start position of the reference frame including these headers.

The table generation circuit 12 determines the positional relationship in the data sequence of the reference frame based on the start position of the reference frame detected by the reference frame detection circuit 11,
That is, a reference table indicating the distance between data is generated. The recording conversion circuit 13 is a signal processing circuit that converts the input data string into data and the recording conversion circuit 14 converts the reference table into a form recordable on a recording medium. The recording control circuit 16 is a control circuit that performs control necessary for recording on the recording medium 15.

FIG. 8 shows a positional relationship in a data string of a reference frame to be reproduced in high-speed reproduction. In the figure, I is I-
Picture and P indicate P-Picture, and B indicates B-Picture. It is assumed that time elapses from left to right in the figure. Now, if the first frame to be recorded in the reference table is an I-Picture located on the left side of the drawing,
The next I-Picture in the lookup table, followed by the next
The distance to the I-Picture is recorded. At the time of playback, high-speed playback is possible by skipping playback to an adjacent I-Picture with reference to the reference frame information recorded in this table. Furthermore, if the I-Picture is skipped and played back one by one, double speed playback of the high speed playback is possible. In the figure, it means that distance information is recorded at which I-Picture, which is the start point of the arrow, can be skipped from one I-Picture at the end point of the arrow. In this way, reference frame information indicating the distance between a specific or all I-Pictures and the next I-Picture to be reproduced is created as a reference table.

FIG. 9 is a diagram showing reference frame information to be added in another high-speed reproduction. This is an example in which P-Picture distance information is added in order to shorten the skip interval in high-speed playback. In order to play back the P-Picture, it is necessary to play back the immediately preceding reference frame (I-Picture or P-Picture). Therefore, in addition to the example shown in FIG.
It records the distance relationship of ure. In this example, reproduction at a lower speed than in the example shown in FIG. 8 becomes possible.

FIG. 10 is a diagram showing the relationship of reference frame information to be added in reverse reproduction.

First, the frame to be reproduced is an I-Picture at the start point of the arrow located on the right side of the figure, and reference frame information indicating the distance to any I-Picture at the end point of the arrow is recorded. It means that it is. If the frames are sequentially traced based on the reference frame information, the reverse reproduction can be performed. These reference tables are also effective for searching and the like.

The reference table is created as described above. Here, two types of high-speed reproduction and one type of reverse reproduction have been described as examples, but other methods may be used in creating a reference table.

Referring to FIG. 1, an image data sequence generated by a moving image compression coding system combining motion prediction coding and variable length coding is input to reference frame detection circuit 11 and recording conversion circuit 13. You. The reference frame detection circuit 11 detects the start position of the reference frame from the image data sequence, and outputs the start position to the table generation circuit 12. The table generation circuit 12 calculates the distance in the data sequence between the reference frames from this start position, and generates a reference table for special reproduction. The generated reference table is converted by the recording conversion circuit 14 into a form suitable for recording, and is recorded in a specific area of the recording medium 15.

The image data string is similarly converted by the recording conversion circuit 13 into a form suitable for recording, and then converted to a recording medium 15.
Will be recorded.

At the time of reproduction, high speed special reproduction becomes possible by reading image data necessary for reproduction by referring to the reference table.

FIG. 2 is a block diagram of a moving image recording apparatus according to a second embodiment of the present invention.

The recording apparatus according to this embodiment is similar to the recording apparatus shown in FIG.
Instead of the distance between frames in the first embodiment, the recording position of the reference frame on the recording medium is recorded as a table on the recording medium.

The recording control circuit 26 controls recording on the recording medium 15 and outputs a signal indicating the current recording position, such as an address previously allocated on the recording medium.

The table generation circuit 22 includes the recording control circuit 2
6, a recording position where a reference frame is recorded is specified, and a reference table for special reproduction is generated.

The input image data sequence generated by the moving image compression coding system combining the motion prediction coding and the variable length coding is input to the reference frame detection circuit 11 and the recording conversion circuit 13. The reference frame detection circuit 11 detects the position of the reference frame from the image data sequence and outputs the start position of the reference frame to the table generation circuit 22. The table generation circuit 22 generates a special reproduction reference table to be referred to at the time of special reproduction or search based on the detection signal and the recording position (for example, address) on the recording medium from the control circuit 26. .

The generated reference table is stored in the recording conversion circuit 1
4 and converted into a form suitable for recording, and recorded on the recording medium 15.

The image data sequence is similarly converted by the recording conversion circuit 13 into a form suitable for recording and then recorded on the recording medium 15.

At the time of special reproduction, the data in the reference table is referred to, and the image data required for reproduction can be read at high speed.

FIG. 3 is a block diagram of a moving image recording apparatus according to the third embodiment of the present invention.

Referring to the figure, an encoding circuit 31 replaces the table generating circuit 12 in the embodiment of FIG. The encoding circuit 31 encodes information relating to the distance between reference frames in the data sequence, which is necessary for high-speed reproduction or reverse reproduction, and refers to a special reproduction reference that is a data sequence that can be inserted into the input image data sequence. Generate a data string. The information to be encoded is, for example, a distance in a code string from a reference frame to be reproduced to a reference frame to be reproduced next, as shown in FIGS.

The timing generation circuit 32 generates an encoding signal based on the detection signal from the reference frame detection circuit 11.
Generates a timing for inserting the code string for special reproduction generated in step (1).

The delay circuit 33 is a circuit for delaying the image data sequence during the generation period of the special reproduction reference data sequence.

The switching circuit 34 includes a timing generation circuit 32
In response to the timing signal from the controller, the delayed image data sequence output from the delay circuit 33 and the reference data sequence encoded from the special reproduction reference frame information output from the encoding circuit 31 are switched. A data string indicating the distance of the reference frame used at the time of reproduction is inserted into the image data string. As the insertion position, the image data string is MPEG
In the case of the two systems, it is conceivable that the data is inserted into the user data area prepared in the header of the upper layer, and further into the system layer (hierarchy equal to or higher than the image data sequence) positioned higher. Here is an example of the insertion position,
It is not particularly limited to that position, as long as it is recorded so that there is no problem during normal reproduction even after inserting the special reproduction data string, or so that the special reproduction data string can be easily separated and removed at the time of reproduction. , Any position in the image data sequence.

The output of the switching circuit 34 is
Is converted into a form suitable for recording, and is recorded on the recording medium 15.

At the time of special reproduction, special reproduction is possible by decoding the reference data sequence for special reproduction and sequentially reading out image data sequences necessary for reproduction. Further, the reference data string can be effectively used for a search or the like.

FIG. 4 is a block diagram of a moving image recording apparatus according to a fourth embodiment of the present invention.

Referring to the figure, address decoder 41 outputs an address for specifying a recording position on recording medium 15 from a signal indicating a recording position from recording control circuit 26.

The encoding circuit 42 replaces the table generating circuit 12 shown in FIG. The encoding circuit 42 receives the address from the address decoder 41 and the reference frame detection circuit 1
8 to 10 based on the detection signal from
As shown in (1), the recording position of the reference frame to be reproduced next during special reproduction is encoded as reference frame information, and a data string is generated. The recording position referred to here may be address information predetermined on a recording medium, a time code serially added at the time of recording, a relative address from a frame into which a code is inserted, a relative time code, and the like. Any information may be encoded as long as it is information relating to a recording position at which the position where the head of the image data sequence on the recording medium is recorded for reproduction can be specified.

FIG. 5 is a block diagram of a moving image recording apparatus according to a fifth embodiment of the present invention.

In this embodiment, a meaningless code detecting circuit 61 and a meaningless code deleting circuit 62 for deleting a specified number of meaningless codes are added to the block diagram shown in the embodiment of FIG. ing.

The meaningless code detection circuit 61 detects a code data sequence which is inserted to adjust the total code amount when the moving image is compressed and coded to generate an image data sequence and which has no meaning and which is not involved in reproduction. Circuit. Representative meaningless codes in the MPEG2 system are a sequence header, GO
A start code of a data string in which reproduction information is encoded in a higher layer than image data such as a P header and a Picture header, that is, a code of 32 bits (“000000000000000000000001...”) Starting with 23 0s and 1s subsequent thereto The 0 inserted immediately before is a meaningless code regardless of the number. Here, the meaningless code detection circuit 61 detects the number and position of 0s inserted immediately before the start code.

The meaningless code elimination circuit 62 includes a switching circuit 34
In this case, meaningless codes corresponding to the reference data sequence for special reproduction that has been inserted or are already inserted are deleted from the image data sequence.

That is, based on the meaningless code detection signal from the meaningless code detection circuit 61 and the data amount of the reference data sequence output from the encoding circuit 31, the total data amount of the input image data sequence and the special reproduction The adjustment is performed so that the total data amount of the image data sequence after the insertion of the reference data sequence becomes equal. As a result, the data amount does not increase.

In the reference table or the reference data string,
The time interval at the time of reproduction between the reference frames may be recorded in the same manner as the additional information. Similarly, it is also possible to record the number of frames and the data amount of the reference frame during reproduction between the reference frames.

FIG. 6 is a block diagram of a moving picture reproducing apparatus according to a sixth embodiment of the present invention. This apparatus reproduces data from a recording medium on which recording has been performed by the recording apparatus shown in FIGS.

The reproduction conversion circuit 61 performs the processing performed when writing to the recording medium 15 in the recording conversion circuit 13 shown in FIGS. 1 and 2, and the reproduction conversion circuit 64 performs the processing performed in the recording conversion circuit 14. It is a circuit that performs inverse conversion of processing, that is, processing such as demodulation, error correction, and block release.

The table reference circuit 65 stores the special reproduction information written in a predetermined area of the recording medium 15, that is, the recording start position of the reference frame, the data amount, the distance between the reference frames (or the address of the reference frame), and the reproduction time. The information of the reference table such as the interval is read, and at the time of special reproduction, the reproduction control circuit 63 is instructed on the end position in the image data string of the currently read frame and the start position of the frame to be subsequently read.

The reproduction control circuit 63 controls the read operation according to the instruction so that the image data sequence of the frame required for the special reproduction falls within the range in which the remaining recording capacity of the buffer memory 62 at the subsequent stage is constant.

The buffer memory 62 supplies the image data sequence read discontinuously from the recording medium 15 to the decoding circuit 66 as a continuous image data sequence. The decoding circuit 66 is a circuit for reproducing an image from the input image data sequence,
Here, an MPEG2 decoder is shown. However, if the input data string is MPEG2, an MPEG2 decoder, MP2
If it is EG1, an MPEG1 decoder, If the image data string is H.261, It depends on the method of compressing and encoding the image data sequence, such as the H.261 decoder, and is not particularly limited. These pieces of special reproduction information can also be used for purposes such as search and cueing.

As described above, the image data sequence of the reference frame to be trick-played is sequentially input from the recording medium to the decoding circuit 66, so that trick-play can be easily performed.

FIG. 7 is a block diagram of a moving image reproducing apparatus according to the seventh embodiment of the present invention.

When writing to the recording medium 15, the reproduction conversion circuit 61 performs the recording conversion circuit 13 shown in FIGS.
Is a circuit that performs the inverse conversion of the processing performed in the above, that is, processing such as demodulation, error correction, and block release.

The code separation circuit 71 provides special reproduction information inserted at the beginning of the reference frame at the time of recording, that is, the recording start position of the reference frame, the data amount, the distance between reference frames (or the address of the reference frame), and the reproduction time. Are separated.

The information decoding circuit 72 calculates the length of the currently read frame output from the separation circuit 71 and the recording position of the image data of the next frame to be read on the recording medium 15, and calculates the position of the frame currently being read. The end position of the image data sequence and the start position of a frame to be subsequently read are specified.

According to the instruction, the reproduction control circuit 63 controls the reading of the image data string of the frame necessary for the special reproduction from the recording medium 15 so as to be within the range in which the remaining recording capacity of the buffer memory 62 at the subsequent stage is constant. I do.

The buffer memory 62 supplies the image data sequence read discontinuously from the recording medium 15 to the decoding circuit 66 as a continuous image data sequence. The decoding circuit 66 is a circuit for reproducing an image from the input image data sequence, and here, an MPEG2 decoder is shown. Here, similarly, if the input data string is MPEG1, the MPEG1 decoder, If the image data string is H.261, It is possible to use a decoder such as a H.261 decoder which depends on a method of compression-coding an image data sequence. These pieces of special reproduction information can also be used for purposes such as search and cueing.

In this way, the distance between the address and the code on the recording medium indicating the beginning of the frame to be reproduced next to the frame reproduced at the time of special reproduction is detected at the time of recording, and is recorded on the recording medium. By additionally recording, special reproduction such as high-speed reproduction and reverse reproduction of the recorded image data sequence can be easily performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of a moving image recording device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a moving image recording device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a moving image recording device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a moving image recording apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram of a moving image recording device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram of a moving image reproducing device according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram of a moving image reproducing device according to a seventh embodiment of the present invention.

FIG. 8 is a first diagram illustrating a relationship between frames to be reproduced in high-speed reproduction.

FIG. 9 is a second diagram illustrating a relationship between frames to be reproduced in high-speed reproduction.

FIG. 10 is a diagram showing a relationship between frames to be reproduced in reverse reproduction.

FIG. 11 is a diagram illustrating a reference relationship between encoded frames.

FIG. 12 is a diagram for explaining a variation in a data amount for each frame.

FIG. 13 is a block diagram of a conventional moving image recording apparatus.

FIG. 14 is a block diagram of a conventional moving image reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Reference frame detection circuit 12 Table generation circuit 15 Recording medium 16 Recording control circuit 31 Encoding circuit 32 Timing generation circuit 41 Address decoder 61 Nonsense code detection circuit 62 Nonsense code deletion circuit 65 Table reference circuit 71 Code separation circuit

Claims (12)

[Claims] 1. A detecting means for detecting a specific frame from an image data sequence encoded on a frame basis by intra-frame encoding or inter-frame encoding, and a position of the detected frame in the image data sequence. Recording means for recording information for specifying the information on a recording medium. 2. The recording means records the information as a table in a first area of the recording medium, and stores the encoded image data sequence in a second area of the recording medium.
Further comprising image data recording means for recording in the area of
The moving image recording device according to claim 1. 3. The moving image recording apparatus according to claim 1, wherein the recording unit records the image data string in a state where the information is inserted. 4. The information for specifying the position is information indicating a start position of the specific frame.
4. The moving image recording apparatus according to any one of claims 1 to 3. 5. The moving image recording apparatus according to claim 1, wherein the information for specifying the position is a distance between the specific frames. 6. The recording device according to claim 1, wherein the recording unit records the time interval at the time of reproduction between the specific frames.
6. The moving image recording apparatus according to any one of claims 1 to 5. 7. The moving image recording apparatus according to claim 1, wherein the recording unit records the subordination relation in encoding of the specific frame. 8. The image data sequence according to claim 1, wherein the image data sequence is a data sequence encoded by an MPEG system, and wherein the detecting unit detects a header portion included in the image data sequence. The moving image recording apparatus according to the above. 9. The moving picture recording apparatus according to claim 3, wherein the image data string includes a meaningless code, and the recording unit deletes the meaningless code and inserts and records the information to record. 10. A first output unit for outputting an image data sequence encoded in units of frames by intra-frame encoding or inter-frame encoding for recording on a recording medium, and a specification included in the image data sequence. A second output unit for outputting information for specifying the position of the frame in order to record the information on the recording medium. 11. A recording medium for recording image data composed of a plurality of frames, which is encoded by intra-frame encoding or inter-frame encoding, wherein a position at which a specific frame among the plurality of frames is recorded is determined. A recording medium having a portion for recording information for specifying. 12. A moving picture reproducing apparatus for reading and reproducing image data from a recording medium, comprising: first reading means for reading information for specifying a position where a specific frame is recorded; A second reading means for reading out a specific frame from a plurality of frames included in the image data based on the obtained information.