JP3129092B2 - Encoded data editing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an encoding system capable of providing image data which does not cause image disturbance when random reproduction is performed from coded data within a moving image. The present invention relates to a data editing device.

[0002]

2. Description of the Related Art As a highly efficient moving picture coding method, there is a method combining intra-picture coding and inter-picture difference coding.
This is very effective for reducing the temporal redundancy of the information amount of a moving image.

[0003] Intra-image encoding is a method of encoding using only the information of the image to be encoded, that is, information of the image of interest itself. Inter-image difference encoding encodes an image by referring to images other than the image of interest. It is a method to make it.

[0004] The inter-image difference encoding includes forward prediction encoding for encoding the difference between an image located forward in time and an image of interest, and an image located forward in time or an image located backward or forward. And bidirectional predictive encoding for encoding the difference between any one of the images generated by interpolation of the image located behind and the image of interest.

[0005] An example of a conventional coded data editing apparatus to which the above-described high-efficiency moving picture coding method is applied will be described.
This will be described below with reference to the drawings.

FIG. 6 shows the configuration of a conventional encoded data editing device. 6, reference numeral 1 denotes an encoding unit that encodes input moving image data, 2 denotes a recording medium for recording data encoded by the encoding unit 1, and 3 denotes a code read from the recording medium 2. A decoding unit for decoding the encrypted data. The encoding unit 1 also has a decoding function inside. The decoding unit 3 has an image memory for storing the decoded data inside.

Here, an example of the configuration of the encoded data generated by the encoding unit 1 will be described with reference to FIG. FIG.
, The original image data is a series of moving image data strings input to the encoding unit 1, the encoded data a is an encoded data string when each image of the original image data is encoded, and the encoded data b is a code. Encoded data a rearranged inside the encoding unit 1 and output from the encoding unit 1;
The coded data c indicates a coded data string when reading out the coded data in the middle of the coded data recorded on the recording medium 2 and thereafter. In the figure, original image data is represented by O () for each image unit, and intra-coded data, forward predicted coded data, and bidirectional predicted coded data are I (), P (), B (), respectively. It is represented using the symbol. O (), I (), P (),
The numbers in parentheses in B () represent the temporal order. For example, P (50) encodes the original image data O (50). There is a correspondence.

[0008] Original image data O () is input from the outside to the encoding unit 1 of FIG. 6, and I (), P (), and B () of the encoded data a are generated inside the encoding unit 1. , I (),
The order of P () and B () is rearranged into an order suitable for decoding and output.

The following describes the encoded data I (), P (), B
() Will be described. For example, in FIG. 7, I (56) of the encoded data a is generated only from the original image data O (56). P (62) is a decoded version of P (59) located ahead in time or original image data O (5).
9) and the difference between the original image data O (62) and the original image data O (62).

As described above, since P () is encoded with reference to the nearest P () or I () located ahead in time, it is natural to use the time used for encoding when decoding. Information on the nearest P () or I () located in front of the target is required.

Next, B () will be described. B () is encoded data generated by the above-described bidirectional prediction encoding. For example, in FIG. 7, B (54) of the encoded data a
Is generated using any one of the following differences a, b, and c.

A difference between a decoded version of P (53) located in front of time or the original image data O (53) and the original image data O (54) is defined as a difference a.

A decoded version of I (56) located behind in time or O (56) and original image data O (5)
4), which is referred to as a difference b.

A coded version of P (53) located earlier in time or original image data O (53) and a decoded version of I (56) located later in time or A difference between the interpolated image with the original image data O (56) and the original image data O (54) is defined as a difference c.

B (54) encodes the difference a, difference b and difference c with the smallest information amount.

Thus, B () is the nearest P () or I () located forward in time, or the nearest P () or I () located backward in time, or Since the encoding is performed using the interpolation image of the nearest P () or I located earlier in time and the nearest P () or I () located later in time, it is naturally decoded. At the time of encoding, information on the nearest P () or I () located before or after, or both before and after, used in encoding is required.

Therefore, if B () is encoded using the nearest P () or I () located backward in time, when B () is decoded, B () is The nearest P () located at the rear in time used for encoding
Or I () must have been decoded first.

More specifically, if B (51) and B (52) in the encoded data a of FIG. 7 are encoded using P (53) located at the rear in time, B
To decrypt (51) and B (52), first P (53)
Must be decrypted. Therefore, P (53) is changed to B (51) and B (5) as shown in the encoded data b of FIG.
FIG. 6 is rearranged in the order that comes before 2).
Is output from the encoding unit 1.

For the same reason, the encoded data b in FIG.
At I (56), P (59), P (62), P (6
5), P (68) and I (71) are B (54),
B (57), B (60), B (63), B (66), B
The order is such that it comes before (69).

As described above, since the encoded data is output from the encoding unit 1 in FIG. 6 in the order shown in the encoded data b in FIG. 7, the recording medium 2 in FIG. Coded data is recorded in the order of data b.

When the read start address is input to the recording medium 2, the encoded data recorded after the read start address is read from the recording medium 2.
The read encoded data is decoded by the decoding unit 3.

When random reproduction is performed using the coded data of a moving image as described above, reproduction is performed not from all arbitrary coded data but from arbitrary intra-coded data. Even if it starts reading from forward prediction encoded data or bidirectional prediction encoded data,
This is because forward encoded data and bidirectional encoded data cannot be correctly decoded because there is no intra-image encoded data.

For these reasons, the recording medium 2 shown in FIG.
A read start address corresponding to the intra-picture coded data is used. When random reproduction is performed, the reproduction is started from the intra-picture coded data.

In FIG. 7, the encoded data c is the same as that after I (56) of the encoded data b in FIG. 7 recorded on the recording medium 2 in FIG. For example, in the random reproduction, of the encoded data b of FIG. 7 recorded on the recording medium 2 of FIG. 6, to reproduce the data after I (56), the recording medium 2 of FIG. An address is input, data after I (56) such as encoded data c in FIG. 7 is read out from the recording medium 2, and is decoded by the decoding unit 3 in FIG.

[0025]

However, in the above configuration, in random reproduction from intra-coded data, FIG. 7 recorded on the recording medium 2 in FIG.
Of the coded data b in FIG. 6 is read from the recording medium 2 in FIG. 6, for example, the data after I (56), that is, the coded data c in FIG. When decoding is performed by the decoding unit 3, FIG.
Of the first intra-image encoded data I (5
6) and decoding of data after the forward prediction coded data P (59), there is no problem, but after I (56), P (5
B (5), which is bidirectional predictive encoded data before 9)
In 4) and B (55), when these are encoded using the forward prediction encoded data P (53) located ahead in time, the decoding is currently performed in the decoding unit 3 in FIG. Is P
Since (53) does not exist, B (54) and B (55) cannot be correctly decoded.
Decoding of (55) causes image disorder during random playback, giving rise to a problem of giving a sense of incongruity to the viewer.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide an encoded data editing apparatus for editing image data so as not to cause image disorder at the initial stage of random reproduction.

[0027]

Means for Solving the Problems To achieve the above object, a first means for solving the problems is to provide an image type judgment circuit for judging a data encoding method before a decoding section, And a decoding determination circuit for limiting data input to the decoding unit.

The second means for solving the problem is to provide an image type determination circuit at a stage preceding the decoding section,
A jump control circuit for skipping data that cannot be correctly decoded is provided, and a jump table having jump address information is provided.

A third means for solving the problem is to provide a jump control circuit for referring to the current read address and skipping data that cannot be correctly decoded, and a jump table having a jump source address and a jump address. It is a thing.

A fourth means for solving the problem is to provide an image type determining circuit at a stage preceding the decoding section,
An input control circuit for replacing data that cannot be correctly decoded with another coded data is provided.

A fifth means for solving the problem is that an output control circuit for outputting an interpolated image of another image is provided in the decoding unit instead of outputting an image that cannot be decoded correctly.

[0032]

In the above arrangement, the first effect is that when a random reproduction command is issued, the image type determination circuit causes the read data to be read first from the intra-picture coded data read first, and then to the subsequent coded data. If it is determined that the data is bidirectional predictive encoded data located between data other than the bidirectional predictive encoded data, the next-stage decoding determination circuit does not input the data to the decoding unit. Encoded data that cannot be decoded is not decoded, and it is possible to provide image data that does not cause image disorder at the beginning of random reproduction.

The second effect is that the read data is transferred between the intra-coded data from which the read data is first read and the subsequent data other than the bidirectional predictive coded data by the image type determination circuit. When it is determined that the data is bidirectional predictive encoded data located, the data cannot be correctly decoded by the jump control circuit that controls the movement of the read position by referring to the jump address recorded in the jump table. The encoded data is skipped, and image data free from image disorder at the beginning of random reproduction can be provided. Also, the time for skipping unnecessary data is reduced.

The third effect is that decoding cannot be performed correctly by a jump control circuit that controls the movement of the current read position by referring to the current read position and an address indicating the range to be skipped recorded in the jump table. Unnecessary data is skipped, and image data free from image disturbance at the beginning of random reproduction can be provided. Also, the time required to skip unnecessary data can be reduced, and the circuit configuration can be simplified.

A fourth effect is that when the image type determination circuit determines that the data is coded data that cannot be decoded correctly, the input control circuit replaces the coded data with another coded data that can be decoded correctly. . As a result, the image at the initial stage of random reproduction can be supplemented with another image without disturbance, and image data can be provided that can prevent a decrease in the number of output images.

The fifth effect is that, by providing an output control circuit in the decoding unit for outputting an interpolated image of another image that is correctly decoded, instead of an image that cannot be correctly decoded, the random playback initializing operation is performed. Can be provided, and it is possible to provide image data capable of smoothing switching of images before and after random reproduction by an interpolation image.

[0037]

【Example】

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of an encoded data editing apparatus according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an encoding unit for encoding moving image data to be input, 2 denotes a recording medium for recording data encoded by the encoding unit 1, and 3 denotes a recording medium read from the recording medium 2. FIG. 6 shows a decoding unit for decoding encoded data.
Is similar to the conventional example. Reference numeral 4 denotes that if a random playback command to start playback from arbitrary intra-coded data is input during the playback of a series of moving images, reading of any currently encoded data being read is performed. A function of turning on a random reproduction signal at the end of the recording operation, inputting a read start address on the recording medium 2 of the encoded data for newly starting reproduction, and giving the read start address to the recording medium 2; 2, a random reproduction detection circuit having a function of holding the current read address, and when the random reproduction signal is on, the coded data following the intra-image coded data read from the new read position are both Whether the data is bidirectional predictive encoded data is determined by the encoding method code included in the data. An image type determination circuit that turns off the decoding permission signal, turns on the decoding permission signal if it is not bidirectional predictive encoded data, and turns off the random reproduction permission signal. Then, a decoding determination circuit that inputs the read encoded data to the decoding unit 3 and that does not input the decoded data to the decoding unit 3 if the decoding permission signal is in an off state.

The operation of the coded data editing apparatus configured as described above will be described with reference to FIGS.

First, a series of input moving image data is encoded by the encoding unit 1 and recorded on the recording medium 2 as encoded data b in FIG. At the time of normal reproduction, the random reproduction signal is in the OFF state and the decoding permission signal is in the ON state. Therefore, the encoded data read from the recording medium 2 by the sequential access is not passed through the image type judgment circuit 5 and the decoding judgment circuit 6. It passes through the processing and is decoded by the decoding unit 3.

For example, when random reproduction is performed from the intra-picture encoded data I (56) while the bidirectional predictive encoded data B (49) of the encoded data b in FIG. 7 is being reproduced,
The random reproduction signal is turned on by the random reproduction detection circuit 4.

The read address of the recording medium 2 is moved to the head of the intra-picture coded data I (56) to be newly decoded, and the intra-picture coded data I (56) like the coded data c in FIG. , Bidirectional predictive encoded data B (5
4), B (55), forward prediction coded data P (59)
And so on.

Since the random reproduction signal of the encoded data read at this time is in the ON state, the image type determination circuit 5 determines whether or not the encoded data is bidirectional predictive encoded data following the intra-image encoded data read first.

The I (56) read first is judged by the image type judging circuit 5 to be not bidirectional predictive encoded data following the first intra-encoded data, passes through the decoding judging circuit 6, and is decoded. The decoding unit 3 decodes the data.

Next, B (54) and B (55) to be read
Are encoded with reference to P (53) located earlier in time, B (54) and B (55) can be correctly decoded in the current state where P (53) is not read out. In order to prevent image distortion, B
Decoding of (54) and B (55) is stopped.

B (54) is determined by the image type determination circuit 5 to be bidirectionally predictive coded data, and the random reproduction signal is on, so that the decoding permission signal is turned off at this time, and The data and the decoding permission signal are input to the decoding determination circuit 6. Decoding decision circuit 6
Since the decoding permission signal is in the OFF state, the input B (54) and B (55) are not input to the decoding unit 3.

Therefore, B (54) and B (55) are not decoded. The next read P (59) is determined by the image type determination circuit 5 to be not bidirectional predictive encoded data, the decoding permission signal is turned on, the random reproduction signal is turned off, and the encoded data and the decoded data are decoded. The decryption permission signal is input to the decryption determination circuit 6.

In the decoding determination circuit 6, since the decoding permission signal is in the ON state, the input P (59) is input to the decoding unit 3 and is decoded.

The encoded data to be read thereafter is normally reproduced because the random reproduction signal is off and the decoding permission signal is on.

As described above, according to the present embodiment, the provision of the image type determination circuit 5 and the decoding determination circuit 6 at the preceding stage of the decoding section 3 makes it impossible to decode correctly, Can be stopped, and moving image data that does not cause a sense of incongruity in random reproduction can be configured.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a configuration diagram of an encoded data editing apparatus showing a second embodiment of the present invention.

In the figure, 1 is an encoding unit, 2 is a recording medium, 3 is a decoding unit, 4 is a random reproduction detection circuit, 5
Denotes an image type determination circuit, which is the same as that of the first embodiment of the present invention shown in FIG. 1 in that a jump control circuit 7 and a jump table 8 are provided.

Here, as shown in (Table 1), as shown in (Table 1), the head address of the first forward prediction encoded data following the intra-picture encoded data is used as a jump address in the jump destination table 8 as shown in (Table 1). Is recorded.

[0054]

[Table 1]

In the above description, the jump destination address is the head address of the first forward prediction coded data following the intra-picture coded data. However, the first bidirectional prediction coded data following the intra-picture coded data is used. May be the start address of encoded data other than the above, or the end address of the first bidirectional predictive encoded data following the intra-picture encoded data.

The operation of the coded data editing device configured as described above will be described below.

For example, when random reproduction is performed from the intra-picture encoded data I (56) while the bidirectional predictive encoded data B (49) of the encoded data b in FIG. 7 is being reproduced,
The random reproduction signal is turned on by the random reproduction detection circuit 4.

The read address of the recording medium 2 is moved to the beginning of the intra-picture coded data I (56) which starts to be newly decoded, and the intra-picture coded data I (56) like the coded data c in FIG. Hereafter, it is going to be read sequentially.

At this time, since the random reproduction signal of the encoded data read at this time is in the ON state, the image type determination circuit 5 determines whether or not the encoded data is bidirectional predictive encoded data following the intra-image encoded data that is first read.

The image type determination circuit 5 determines that I (56) to be read first is not bidirectional predictive coded data following the first intra-coded data, and is decoded by the decoding unit 3. .

Next read B (54), B (55)
Are encoded with reference to P (53) located earlier in time, B (54) and B (55) can be correctly decoded in the current state where P (53) is not read out. In order to prevent image distortion, B
Decoding of (54) and B (55) is stopped.

Since B (54) is determined by the image type determination circuit 5 to be bidirectional predictive encoded data, and the random reproduction signal is on, the decoding permission signal is turned off at this time.

When the decoding permission signal is turned off, the jump control circuit 7 reads the head address of the encoded data P (59) following the bidirectional predictive encoded data to be skipped from the jump table 8, and detects random reproduction. Send to circuit 4.

The random reproduction detection circuit 4 receives the given P
The head address of (59) is input to the recording medium 2 as a read start address. This gives B (54),
B (55) is not read from the recording medium 2 and is not decoded.

The P (59) to be read next is determined by the image type determination circuit 5 to be not bidirectional predictive encoded data, the decoding permission signal is turned on, the random reproduction signal is turned off, and P (59) is turned off. 59) is decoded by the decoding unit 3.

The encoded data to be read thereafter is normally reproduced because the random reproduction signal is off and the decoding permission signal is on.

As described above, according to the present embodiment, the provision of the image type determination circuit 5, the jump destination control circuit 7 and the jump destination table 8 allows decoding of encoded data which cannot be correctly decoded and causes image distortion. This makes it possible to stop the conversion, quickly skip the meaningless encoded data, and configure moving image data that does not cause a sense of incongruity in random reproduction.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a configuration diagram of an encoded data editing apparatus according to a third embodiment of the present invention.

In the figure, reference numeral 1 denotes an encoding unit, 2 denotes a recording medium, 3 denotes a decoding unit, and 4 denotes a random reproduction detection circuit. The above is the same as in the first embodiment of the present invention shown in FIG. It is something. 1 in that a jump control circuit 9 and a jump table 10 are provided. Here, as shown in (Table 2), before the reproduction of the encoded data, the interlace table 10 stores the end address of the intra-coded data as a jump source address and the first address following the intra-coded data as a jump destination address. The head address of the forward prediction coded data is recorded.

[0070]

[Table 2]

In the above description, the jump source address is the end address of the intra-coded data. However, the jump address may be the start address of the first bidirectional predictive encoded data following the intra-coded data. Although the jump destination address is the head address of the first forward prediction encoded data following the intra-coded data, it may be the end address of the first bidirectional predicted encoded data group following the intra-coded data. .

The operation of the coded data editing device configured as described above will be described below.

For example, when random reproduction is performed from the intra-picture encoded data I (56) while the bidirectional predictive encoded data B (49) of the encoded data b in FIG. 7 is being reproduced,
The random reproduction signal is turned on by the random reproduction detection circuit 4. Further, the read position of the recording medium 2 is moved to the beginning of the intra-image coded data I (56) that starts to be newly decoded, and as in the coded data c in FIG. Attempts to read sequentially. At this time, since the random playback signal is on,
The jump control circuit 9 receives the current read address from the random reproduction detection circuit 4, compares this address with the end address of the intra-coded data read from the jump table 10, and detects the end of reading I (56). When the end of the reading of I (56) is detected, the head address of P (59) read from the jump table 10 is sent to the random reproduction detecting circuit 4 to turn off the random reproduction signal. The random reproduction detection circuit 4 inputs the given head address to the recording medium 2. Therefore, the data is read out from the recording medium 2 in the order of I (56) and P (59), and is decoded by the decoding unit 3;
4), B (55) will not be read and will not be decoded. The encoded data to be read thereafter is normally reproduced because the random reproduction signal is in the OFF state.

The operation of the coded data editing apparatus configured as described above will be described below.

For example, when random reproduction is performed from the intra-picture coded data I (56) during the reproduction of the bidirectional predictive coded data B (49) of the coded data b in FIG.
The random reproduction signal is turned on by the random reproduction detection circuit 4.

The read position of the recording medium 2 is moved to the beginning of the intra-picture coded data I (56) to start decoding anew, and the intra-picture coded data I (56) as in the coded data c in FIG. Hereafter, it is going to be read sequentially.

At this time, since the random reproduction signal is on, the jump control circuit 9 receives the current read address from the random reproduction detection circuit 4 and compares this with the read end address of the intra-coded data read from the jump table 10. Then, the end of reading I (56) is detected.

When the completion of reading I (56) is detected, the P (P) read from the
The read start address of (59) is sent to the random reproduction detection circuit 4, and the random reproduction signal is turned off.

The random reproduction detection circuit 4 inputs the given read start address to the recording medium 2.

Therefore, from the recording medium 2, I (56),
The data are read out in the order of P (59) and decoded by the decoding unit 3, but B (54) and B (55) are not read out and are not decoded.

The encoded data to be read thereafter is normally reproduced because the random reproduction signal is in the OFF state.

As described above, according to the present embodiment, by providing the jump control circuit 9 and the jump table 10, decoding of encoded data which cannot be correctly decoded and causes image disturbance is stopped, and the second As compared with the embodiment of the present invention, meaningless encoded data can be skipped quickly with a smaller configuration such as not using an image type determination circuit.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows the configuration of an encoded data editing device according to a fourth embodiment of the present invention.

In the figure, 1 is an encoding unit, 2 is a recording medium, 3 is a decoding unit, 4 is a random reproduction detection circuit,
Denotes an image type determination circuit, which is the same as that of the first embodiment of the present invention shown in FIG. Reference numeral 11 denotes an input control circuit having a buffer capable of storing input intra-picture encoded data.

The operation of the coded data editing apparatus configured as described above will be described with reference to FIG. 4 and FIG.

First, a series of moving images to be input is
The encoded data b in FIG.
It is recorded as follows.

At the time of normal reproduction, the random reproduction signal is in the OFF state and the decoding permission signal is in the ON state. Therefore, the encoded data read from the recording medium 2 by the sequential access is the image type determination circuit 5 and the input control circuit 11. Through the decoding unit 3.

At this time, if the input coded data is intra-picture coded data, the input control circuit 11 stores it in the buffer.

For example, when random reproduction is performed from the intra-picture encoded data I (56) while the bidirectional predictive encoded data B (49) of the encoded data b in FIG. 7 is being reproduced,
The random reproduction signal is turned on by the random reproduction detection circuit 4.

The read address of the recording medium 2 is shifted to the head of the intra-picture coded data I (56) to be newly decoded, and the intra-picture coded data I (56) as shown in the coded data c of FIG. , Bidirectional predictive encoded data B (5
4), B (55), forward prediction coded data P (59)
And so on.

At this time, since the random read signal is in the ON state, the encoded data read at this time is determined by the image type determination circuit 5 to be bidirectional predictive encoded data following the intra-image encoded data read first.

The I (56) read first is judged by the image type judging circuit 5 to be not bidirectional predictive encoded data following the first intra-encoded data, passes through the input control circuit 11, and is decoded. The data is decrypted by the unit 3.

Since I (56) is intra-picture coded data, it is stored in the buffer by the input control circuit 11.

Next read B (54), B (55)
Are encoded with reference to P (53) located earlier in time, B (54) and B (55) can be correctly decoded in the current state where P (53) is not read out. In order to prevent image distortion, B
Decoding of (54) and B (55) is stopped.

B (54) is determined to be the first bidirectional predictive encoded data by the image type determination circuit 5 and is input to the input control circuit 11, and the random reproduction signal is in the ON state. The activation permission signal is turned off.

In the input control circuit 11, since the decoding permission signal is in the off state, the input B (54), B
(55) is not input to the decoding unit 3, and I (56) stored in the buffer is stored in the decoding unit 3 instead of I (56).
Enter once.

Therefore, the data structure is such that I (56) is reproduced where B (54) and B (55) are to be reproduced. The P (59) to be read next is determined by the image type determination circuit 5 to be not bidirectional predictive encoded data, the decoding permission signal is turned on, the random reproduction signal is turned off, and P (59) is The decoding permission signal is input to the input control circuit 11. In the input control circuit 11, since the decryption permission signal is in the ON state, the input P
(59) is input to the decoding unit 3 and is decoded.

The encoded data to be read thereafter is normally reproduced because the random reproduction signal is in the OFF state and the decoding permission signal is in the ON state.

As described above, according to the present embodiment, the image type determination circuit 5 and the input control circuit 11 are provided at the preceding stage of the decoding section 3 so that another coded data can be replaced with coded data that cannot be decoded correctly. By inserting the image data, it is possible to configure image data that can prevent image disorder without reducing the number of display images in random reproduction.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a block diagram of an encoded data editing apparatus showing a fifth embodiment of the present invention. In the figure, 1 is an encoding unit, 2 is a recording medium, 3 is a decoding unit, 4 is a random reproduction detection circuit, and the above are the same as those in the first embodiment of the present invention shown in FIG. What is different from FIG.
Is provided with an output control circuit 12 for controlling the output of the decoded image data.

The operation of the coded data device configured as described above will be described below.

For example, when random reproduction is performed from the intra-picture coded data I (56) while the bidirectional predictive coded data B (49) of the coded data b in FIG. 7 is being reproduced,
The random reproduction signal is turned on by the random reproduction detection circuit 4.

The read address of the recording medium 2 is moved to the head of the intra-picture coded data I (56) to be newly decoded, and the intra-picture coded data I (56) as shown in FIG. Thereafter, they are sequentially read.

I (56) is read out, decoded by the decoding unit 3, and stored in the image memory inside the decoding unit 3.
Similarly, the encoded data read out after I (56) is also decoded by the decoding unit 3 and stored in the image memory inside the decoding unit 3. In addition, at least the decoded data of B (49) is already stored in the image memory inside the decoding unit 3.

Next read B (54), B (55)
Are encoded with reference to P (53) located earlier in time, B (54) and B (55) can be correctly decoded in the current state where P (53) is not read out. In the case of reproduction, it causes image disorder.

From the recording medium 2, B (54), B (5)
5) is read out and input to the decoding unit 3, but the random reproduction signal is in the ON state. In this case, it is necessary to output B (54) and B (55) to the outside of the decoding unit 3. The operation is stopped by the output control circuit 12. The output control circuit 12 outputs I
The data after the decoding in (56) is output to the outside of the decoding unit 3, and the random reproduction signal is turned off.

Since the random reproduction signal is turned off, the output control circuit 12 outputs the data after I (56) to the outside of the decoding unit 3 in the order of normal reproduction.

As described above, according to the present embodiment, the output control circuit 12 is provided inside the decoding unit 3 to stop outputting an image that cannot be decoded correctly to the outside of the decoding unit 3. The image memory inside the decoding unit 3 can be effectively used, and image data that does not cause image disturbance in random reproduction can be provided with a small-scale circuit configuration.

In the above description, the output control circuit 12
The output of the bidirectional predictive coded data that cannot be decoded correctly and causes image distortion is output to the outside of the decoding unit 3. Instead of decoding the directional prediction coded data, the decoded data itself already stored in the image memory of the decoding unit 3 or the decoded data already stored in the image memory of the decoding unit 3 The image data obtained by synthesizing the plurality of data may be output to the outside of the decoding unit 3. In this case, it is possible to provide image data that can be reproduced without reducing the number of displayed images.

[0111]

As described above, the first effect of the present invention is that, by providing the image type determining circuit and the decoding determining circuit at the preceding stage of the decoding unit, the image read first after the random reproduction command is issued. By not inputting the coded data that cannot be correctly decoded and located between the inner coded data and the following coded data other than the bidirectional predictive coded data to the decoding unit, image disorder at the initial stage of random reproduction is reduced. Image data that does not occur can be provided.

The second effect is that by providing an image type determination circuit, a jump destination control circuit, and a jump destination table,
After the random reproduction command, when it is determined that the data is bidirectional predictive encoded data following the first read intra-coded data, the read position is set to the jump address recorded in the jump table. By moving, it is possible to skip encoded data that cannot be decoded correctly and provide image data that does not cause image disorder at the beginning of random reproduction. Further, the time for skipping the encoded data that cannot be decoded correctly can be reduced.

The third effect is that, by providing a jump control circuit and a jump table, after a random reproduction command, the read range recorded in the jump table is referred to, and coded data that cannot be decoded correctly is skipped. By doing so, it is possible to provide image data that does not cause image disorder at the beginning of random reproduction. Also, the time required to skip encoded data that cannot be correctly decoded can be reduced, and the circuit configuration can be simplified.

The fourth effect is that by providing an image type determination circuit and an input control circuit at a stage prior to the decoding unit, the first read intra-coded data and the subsequent bidirectional predictive coding By inserting the previously read intra-coded data in place of the non-decoded coded data located between the coded data other than the data, the image at the beginning of random playback is an undisturbed image. It is possible to provide image data that can be supplemented and can also prevent a decrease in the number of output images.

The fifth effect is that, by providing an output control circuit in the decoding unit, an interpolated image based on the preceding and succeeding images without disturbance is output instead of an image that has not been correctly decoded. It is possible to provide image data that has no image disturbance at the beginning of random reproduction and that can be smoothly switched between images before and after random reproduction by an interpolation image.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an encoded data editing device according to a first embodiment of the present invention;

FIG. 2 is a configuration diagram of an encoded data editing device according to a second embodiment of the present invention;

FIG. 3 is a configuration diagram of an encoded data editing device according to a third embodiment of the present invention;

FIG. 4 is a configuration diagram of an encoded data editing device according to a fourth embodiment of the present invention;

FIG. 5 is a configuration diagram of an encoded data editing device according to a fifth embodiment of the present invention;

FIG. 6 is a configuration diagram of a conventional encoded data editing device.

FIG. 7 is a configuration diagram of moving image data used in the present invention and a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Encoding part 2 Recording medium 3 Decoding part 4 Random reproduction detection circuit 5 Image type judgment circuit 6 Decoding judgment circuit 7 Jump control circuit 8 Jump table 9 Jump control circuit 10 Jump table 11 Input control circuit 12 Output control circuit

Continuing on the front page (72) Inventor Jun Ikeda 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Ikuji Shimizu 1006 Okadoma Kazuma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 56) References JP-A-6-181569 (JP, A) JP-A-6-261303 (JP, A) JP-A-6-233242 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) H04N 5/91-5/956 G11B 20/10-20/12 H04N 7/24-7/68

Claims (5)

(57) [Claims] An encoded data group in which continuous moving picture information is coded while inter-picture coding and bidirectional predictive coding are interlaced, both of which are coded by referring to preceding and succeeding picture information. A recording unit that records and holds the coded data of the directional image information after referring to the directional predicted coded data, and a random reproduction command to start reproduction from arbitrary intra-coded data input from the outside, A random playback detection circuit for controlling a read address of a group of encoded data recorded in a recording unit and generating random playback start information; and an encoded image read from the recording unit by the random playback start information. An image type determination circuit that determines whether or not a group of bidirectional predictive encoded data continues after encoded data and generates decoding permission information; Coded data editing apparatus characterized by comprising a decoding judgment circuit for controlling the output to more read the next stage of the bidirectional predictive coded data group. 2. A coded data group obtained by coding continuous moving picture information while interlacing intra-picture coding and bidirectional predictive coding, both of which are coded by referring to preceding and succeeding picture information. A recording unit that records and holds the coded data of the directional image information after referring to the directional predicted coded data, and a random reproduction command to start reproduction from arbitrary intra-coded data input from the outside, A random playback detection circuit for controlling a read address of a group of encoded data recorded in a recording unit and generating random playback start information; and an encoded image read from the recording unit by the random playback start information. An image type determination circuit that determines whether or not a group of bidirectional predictive encoded data is continuous after encoded data and generates decoding permission information; and the encoded data group. A jump destination table in which jump address information for skipping only the continuous bidirectional predictive encoded data group following the intra-encoded data is written, and the jump destination table is generated by the image type determination circuit. A jump control circuit that passes the jump address information to the random reproduction detection circuit with reference to the jump table in order to skip the bidirectional predictive encoded data group by the decoding permission information. Characterized encoded data editing device. 3. An encoded data group in which continuous moving image information is encoded while inter-image encoding and bidirectional predictive encoding are interwoven, both of which are encoded with reference to temporally preceding and succeeding image information. A recording unit for recording and holding the encoded data of the backward image information after referring to the encoded directional prediction data, and the recording by a random reproduction instruction to start reproduction from arbitrary intra-coded data input from the outside A random playback detection circuit that controls a read address of a group of encoded data recorded in the unit and generates random playback start information; and bidirectional predictive encoding that follows the intra-picture encoded data in the encoded data group. A jump table in which jump source and jump address information for skipping only the data group is described; and the jump table generated by the random reproduction detection circuit. When the current read address information of the recording unit matches the jump source address information in the jump table in order to skip the bidirectional predictive encoded data group by random playback start information, the jump address information in the jump table is matched. And a jump control circuit for passing the data to the random reproduction detection circuit. 4. An encoded data group in which continuous moving picture information is encoded while inter-picture encoding and bidirectional predictive encoding are interlaced, both of which are encoded by referring to temporally preceding and succeeding picture information. A recording unit for recording and holding the encoded data of the backward image information after referring to the encoded directional prediction data, and the recording by a random reproduction instruction to start reproduction from arbitrary intra-coded data input from the outside A random reproduction detection circuit for controlling a read address of a group of coded data recorded in the unit and generating random reproduction start information; and coded data read from the recording unit by the random reproduction start information is subjected to intra-coding. An image type determination circuit that determines whether the data group is a bidirectional predictive encoded data group that is continuous after the data and generates decoding permission information; And an input control circuit for temporarily storing the intra-picture encoded data to be outputted and outputting the intra-picture encoded data to the next stage instead of the bidirectional prediction encoded data group according to the decoding permission information. Coded data editing device. 5. A coded data group obtained by coding continuous moving picture information while interlacing intra-picture coding and bidirectional predictive coding, both of which are coded with reference to temporally preceding and succeeding picture information. A recording unit for recording and holding the encoded data of the backward image information after referring to the encoded directional prediction data, and the recording by a random reproduction instruction to start reproduction from arbitrary intra-coded data input from the outside A random reproduction detection circuit that controls a read address of an encoded data group recorded in the unit and generates random reproduction start information; and a decoding circuit that sequentially decodes the encoded data group read from the recording unit. A storage unit for sequentially storing the decoded data, and a storage unit for storing the random reproduction start information generated by the random reproduction detection circuit in the storage unit. The decoded data obtained by decoding the bidirectional predictive coded data that is continuous after the intra-coded data among the decoded data that has been decoded is not output to the outside, or the storage unit is used instead of the decoded data. Or outputs a decoded image group stored in the storage unit instead of the decoded data group of the bidirectional predictive encoded data group. A coded data editing device comprising: a decoding unit having an output control circuit for outputting the coded data.