JPH11215465A - Apparatus and method for dynamic image reproducing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamic image reproducing device by which an unsightly image possibly caused by reproduction of dynamic image data including defects is eliminated. SOLUTION: This dynamic image reproducing device 10 reproduces dynamic image data, including image data that are generated by inter-frame correlation compression and to which an error correction code is added. The device is provided with an error correction means 112, that corrects an error of the image data to which the error correction code is added based on the error correction code, a detection means 112 that detects image data whose error cannot fully be corrected as defective image data, when the error correction means 112 cannot fully correct the error of the image data and a reproduction means 114 that reproduces the image data, while leaving out the defective image data detected by the detection means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a moving picture reproducing apparatus for reproducing moving picture data including a plurality of image data corresponding to a plurality of frames. Further, the present invention relates to a moving image reproducing method for reproducing moving image data including a plurality of image data corresponding to a plurality of frames.

[0002]

2. Description of the Related Art Recently, DVDs (Di-
Optical disks such as gital Video Disk have been attracting attention. Generally, on such an optical disc, moving image data is compressed and recorded based on a compression method defined by MPEG (Moving Picture Experts Group). When playing back compressed video data recorded on an optical disc,
Naturally, it is expanded and reproduced based on the expansion method defined by MPEG.

[0003] Compressed moving image data includes a plurality of image data corresponding to a plurality of frames. These image data are provided with an error correction code, and errors in the image data are corrected by the error correction code.
However, there is a limit to the error correction by the error correction code to some extent, and the error of the data may not be completely corrected by the error correction code. Image data for which an error cannot be completely corrected by the error correction code is referred to as defective image data.

[0004] The compressed moving image data may include the above-described defective image data. At present, compressed moving image data including such defective image data is also reproduced in the same manner as normal compressed moving image data.

[0005]

However, as described above, if the compressed moving image data including the defective image data whose error cannot be completely corrected by the error correction code is directly reproduced, the reproduced image becomes unsightly. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-mentioned circumstances, and is a moving image reproducing apparatus capable of resolving an unsightly image which can be caused by reproducing moving image data including defective image data. And a moving image reproducing method.

[0007]

In order to solve the above problems and achieve the object, a moving picture reproducing apparatus and a moving picture reproducing method according to the present invention are configured as follows.

According to the present invention, there is provided a moving image reproducing apparatus for reproducing moving image data which is generated by inter-frame correlation compression and to which an error correction code is added, and which includes a plurality of image data corresponding to a plurality of frames. An error correction unit that corrects an error of the image data to which the error correction code is added based on the error correction code; and if the error of the image data cannot be completely corrected by the error correction unit, the error is corrected. A detecting unit for detecting the image data which cannot be detected as defective image data; and a reproducing unit for reproducing the image data by extracting the defective image data detected by the detecting unit.

According to the present invention, there is provided image data which is generated by inter-frame correlation compression and has an error correction code added thereto, the main image data corresponding to a main frame,
First image data corresponding to a first sub-frame following the main frame, second image data corresponding to a second sub-frame following the first sub-frame, and following the second sub-frame In a moving image reproducing apparatus for reproducing moving image data including third image data corresponding to a third sub-frame, an error correction for correcting an error of the image data added with the error correction code based on the error correction code. Means for detecting, when the error in the image data cannot be completely corrected by the error correcting means, detecting the image data in which the error cannot be completely corrected as defective image data; and detecting the second image by the detecting means. If data is detected as the defective image data, the second image data is skipped and the first image data is deleted.
Reproducing means for reproducing the third image data following the image data.

According to the present invention, there is provided image data which is generated by inter-frame correlation compression and has an error correction code added thereto, the main image data corresponding to a main frame,
First image data corresponding to a first sub-frame following the main frame, second image data corresponding to a second sub-frame following the first sub-frame, and following the second sub-frame In a moving image reproducing apparatus for reproducing moving image data including third image data corresponding to a third sub-frame, an error correction for correcting an error of the image data added with the error correction code based on the error correction code. Means for detecting, when the error in the image data cannot be completely corrected by the error correcting means, detecting the image data in which the error cannot be completely corrected as defective image data; and detecting the second image by the detecting means. If data is detected as the defective image data, the first image data is faded out and the third image data is faded out. Fade in the image data, and a reproducing means for reproducing said third image data following the first image data.

According to the present invention, there is provided image data generated by inter-frame correlation compression and to which an error correction code is added, wherein the main image data corresponds to a main frame.
First image data corresponding to a first sub-frame following the main frame, second image data corresponding to a second sub-frame following the first sub-frame, and following the second sub-frame In a moving image reproducing apparatus for reproducing moving image data including third image data corresponding to a third sub-frame, an error correction for correcting an error of the image data added with the error correction code based on the error correction code. Means for detecting, when the error in the image data cannot be completely corrected by the error correcting means, detecting the image data in which the error cannot be completely corrected as defective image data; and detecting the second image by the detecting means. When data is detected as the defective image data, the first image data is wiped out and the third image data is wiped out. And wipe in the image data, and a reproducing means for reproducing said third image data following the first image data.

According to the present invention, there is provided image data generated by inter-frame correlation compression and having an error correction code added thereto, the main image data corresponding to a main frame,
First image data corresponding to a first sub-frame following the main frame, second image data corresponding to a second sub-frame following the first sub-frame, and following the second sub-frame In a moving image reproducing apparatus for reproducing moving image data including third image data corresponding to a third sub-frame, an error correction for correcting an error of the image data added with the error correction code based on the error correction code. Means for detecting, when the error in the image data cannot be completely corrected by the error correcting means, detecting the image data in which the error cannot be completely corrected as defective image data; and detecting the second image by the detecting means. When data is detected as the defective image data, the first image is reproduced during the reproduction time period of the first and second image data. Play the over data, and a reproducing means for reproducing said third image data to the next of the first image data.

According to the present invention, there is provided image data generated by inter-frame correlation compression and having an error correction code added thereto, the main image data corresponding to a main frame;
First image data corresponding to a first sub-frame following the main frame, second image data corresponding to a second sub-frame following the first sub-frame, and following the second sub-frame In a moving image reproducing apparatus for reproducing moving image data including third image data corresponding to a third sub-frame, an error correction for correcting an error of the image data added with the error correction code based on the error correction code. Means for detecting, when the error in the image data cannot be completely corrected by the error correcting means, detecting the image data in which the error cannot be completely corrected as defective image data; and detecting the second image by the detecting means. When data is detected as the defective image data, the first image data is reproduced during a reproduction time period of the second image data. Wherein while Edoauto third
Reproduction means for fading in the image data of the third image data and reproducing the third image data following the first image data.

According to the present invention, there is provided image data generated by inter-frame correlation compression and having an error correction code added thereto, the main image data corresponding to a main frame;
First image data corresponding to a first sub-frame following the main frame, second image data corresponding to a second sub-frame following the first sub-frame, and following the second sub-frame In a moving image reproducing apparatus for reproducing moving image data including third image data corresponding to a third sub-frame, an error correction for correcting an error of the image data added with the error correction code based on the error correction code. Means for detecting, when the error in the image data cannot be completely corrected by the error correcting means, detecting the image data in which the error cannot be completely corrected as defective image data; and detecting the second image by the detecting means. When data is detected as the defective image data, the first image data is reproduced during a reproduction time period of the second image data. And wipe in the third image data while Ipuauto, and a reproduction means for reproducing the third image data following the first image data.

According to the present invention, there is provided a moving image reproducing method for reproducing moving image data which is generated by inter-frame correlation compression and to which an error correction code is added, and which includes a plurality of image data corresponding to a plurality of frames. Based on the error correction code, when an error in the image data to which the error correction code is added cannot be corrected, a first step of detecting the image data in which the error cannot be corrected as defective image data; This first
A second step of reproducing the image data by skipping the defective image data detected in the step.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of a moving image reproducing apparatus according to an embodiment of the present invention. First, with reference to FIGS. 2 and 3, moving image data and audio data recorded on an optical disc reproduced by the moving image reproducing apparatus shown in FIG. 1 will be described.

The moving image data and audio data recorded on the optical disk are, for example, data generated by a compression method (inter-frame correlation compression) defined by MPEG. As shown in FIG. 2, the moving image data includes base image data corresponding to base images (base images 1, 2, and 3),
And a change data indicating a change (movement) of the base image. The main frame is formed by the base image data included in the moving image data, and the sub-frame is formed by the data of the change. The sub-frame is an image following the main frame. The subframe includes a first subframe and a second subframe following the first subframe.
, The (n−1) th subframe, and the nth subframe following the (n−1) th subframe are included. Main image data (base image data) corresponding to the main frame, first image data corresponding to the first sub-frame, second image data corresponding to the second sub-frame,..., N-th sub-frame The corresponding n-th image data is sequentially reproduced (moving image reproduction).

Further, these image data include an error correction code (ECC) as a redundant word.
ode). With this error correction code, it is possible to correct errors in image data to some extent.

Here, with reference to FIG. 3, compression by MPEG (inter-frame correlation compression) will be further described. FIG. 3 is a diagram showing an image of an encoding method of digital image data by MPEG. That is, in MPEG, one sequence of digital image data is composed of a plurality of frames (pictures).
re) and coding is performed.

The GOP includes an I picture (Intra-Picture / intra-coded image) corresponding to a main frame,
P picture equivalent to a subframe (Predictive-Pictu
re / Predictive coded image) and B picture (Bidirectionally Predictive-Picture) corresponding to a subframe
/ Bidirectionally Predictive coded image).

An I picture has information for one screen only in its frame without information on a temporal difference. The P picture is obtained by adding information having a temporal change such as a motion to the I picture, and is predicted and generated from a temporally previous frame. The B picture is generated by prediction from two frames that are temporally preceding and succeeding.

In other words, an I picture is digital image data created from a one-frame screen, and can be reproduced by decoding the image as it is. The P picture is digital image data containing only a difference from the I picture, and can reproduce an image by using both the I picture and the P picture. Further, a B picture is digital image data containing only a difference between an I picture and a P picture, and can reproduce an image by using both the I picture and the P picture. Since the P picture and the B picture include only the difference information, the data amount is small. However, even if digital image data of only a P picture or only a B picture is received, the image cannot be reproduced.

Next, with reference to FIG. 1, a schematic configuration of a moving picture reproducing apparatus according to an embodiment of the present invention will be described. As shown in FIG. 1, the moving image reproducing apparatus 10 reproduces moving image data and audio data recorded on the optical disc 1. The moving image reproducing apparatus 10 includes a CPU 102, a memory 104, an optical disk driving unit 106, an optical pickup 108, a servo control circuit 110, and an error correction circuit 11.
2, a data reproducing unit 114 and an operation unit 116 are provided.

The CPU 102 is connected via a bus 102a to
Memory 104, optical disk drive 106, optical pickup 108, servo control circuit 110, error correction circuit 11
2 and the data reproducing unit 114. That is, the CPU 102 controls the entire moving picture reproducing apparatus 10. In the memory 104, a control program of the CPU 102 and the like are recorded.

The disk drive circuit 106 drives the optical disk according to the servo control signal output from the servo control circuit 110.

The optical pickup 108 is provided with a semiconductor laser 108a. This semiconductor laser 108a
From there, a light beam for reproduction is irradiated. The optical beam for reproduction is irradiated on the optical disk, and the reflected light of the optical beam for reproduction from the optical disk is received by the optical pickup 108. The reflected light reflects the optical disk data recorded on the optical disk. That is, the optical pickup 108 acquires optical disk data recorded on the optical disk. Incidentally, in the case of this embodiment, the optical disk data includes moving image data including image data, audio data, and the like.

The servo control circuit 110 outputs a servo control signal to the optical pickup 108 and the disk drive circuit 106. That is, the servo circuit 110 servo-controls the optical pickup 108 and the disk drive circuit 106. By the servo control of the servo circuit 110,
Focus control and tracking control of the light beam emitted from the optical pickup 108 are executed.

The error correction circuit 112 performs an error correction process on the image data included in the optical disk data obtained by the optical pickup 108 using an error correction code assigned to the image data. In addition, there is a certain limit to error correction using error correction codes.
In some cases, data errors cannot be completely corrected by the error correction code. Image data for which an error cannot be completely corrected by the error correction code is referred to as defective image data. When the error correction circuit 112 detects the defective image data, the error correction circuit 112 notifies the CPU 102 of the presence of the defective image data. Further, the CPU 102 having received the notification of the presence of the defective image data notifies the data reproducing unit 102 of the presence of the defective image data.

The data reproducing section 114 has an MP (not shown)
An EG decoder is provided. The optical disc 1 has M
Image data compressed by PEG (inter-frame correlation compression) is recorded. That is, the image data extracted from the optical disc 1 is decoded by the MPEG decoder. The data reproducing unit 114 is provided with an image memory functioning as a buffer. The data reproducing unit 114 reproduces the image data and the audio data that have been subjected to the error correction processing by the error correction circuit 112. That is, the data reproducing unit 114 outputs an image signal that can be output to a display and an audio signal that can be output to a speaker based on the image data and the audio data. The data reproducing unit 114 executes an image signal output process described later.

The operation unit 116 is provided with a normal playback button, a fast forward button, a fast rewind button, a stop button, and the like, not shown. In other words, the operation unit 116 receives instructions for reproduction (normal reproduction, fast forward, fast rewind) and stop from the user via these buttons. Operation unit 11
The instruction accepted in 6 is notified to the CPU 102.

That is, the operation unit 116 notifies the CPU 102 of a normal reproduction instruction, a fast forward instruction, a fast reverse instruction, a stop instruction, and the like. Further, the CPU 102 having received the notification notifies each unit of a normal reproduction instruction, a fast forward instruction, a fast rewind instruction, and a stop instruction. Thereby, normal reproduction, fast forward, fast rewind, and the like are realized.

Here, the image signal output processing which is a feature of the present invention will be described with reference to FIGS. In brief, the image signal output process is to output defective image data by extracting defective image data. This image signal output processing is executed by the data reproducing unit 114 as described above. FIG. 4 is a flowchart illustrating the image signal output process 1. FIG. 5 is a flowchart illustrating the second image signal output process. FIG. 6 is a flowchart for explaining the image signal output process 3. FIG. 7 shows image signal output processing No. 1, No. 2,
It is a figure for explaining the 3 concretely.

First, an image signal output process 1 will be described with reference to FIGS.

FIG. 7 assumes a case in which main frame 1, main frame 2, sub frame 1, sub frame 2, sub frame 3, sub frame 4, and main frame 3 are reproduced in order. In FIG. 7, it is assumed that the image data corresponding to the sub-frame 2 and the image data corresponding to the sub-frame 3 are defective.

The first image signal output process is started when image data is supplied to the data reproducing unit 114. Of course, this image data is sent to the error correction circuit 112.
Is data that has undergone error correction processing. The image data referred to here is image data corresponding to main frame 1, main frame 2, sub frame 1, sub frame 2, sub frame 3, sub frame 4, and main frame 3.

If the image data is not received by the data reproducing section 114 (ST12, NO), the first image signal output process is not started. The image data is stored in the data reproducing unit 1
If accepted in ST14 (ST12, YES), the image signal output process 1 is started.

First, the n-th image data, that is, the image data corresponding to the main frame 1 is received (ST).
12, YES). At this time, it is determined whether or not the n-th image data, that is, the image data corresponding to the main frame 1 corresponds to the defective image data (ST14). This determination is made based on a notification from the CPU 102 (a notification of the presence of defective image data). Incidentally, the n-th image data at this time, that is, the image data corresponding to the main frame 1 does not correspond to the defective image data (ST1).
4, NO).

If it is determined that the n-th image data does not correspond to the defective image data (ST14, NO), then the necessity of display timing control of the n-th image data is determined (ST16). . When the video playback mode of the video playback device 10 is normal playback, display timing control is required. On the other hand, when the moving image playback mode of the moving image playback device 10 is fast forward or fast reverse, display timing control is not required. That is, this determination is made by the CPU
The notification is performed based on a notification (notification of an instruction of normal reproduction, fast forward, and fast rewind) from the communication 102. As described above, the image signal output processing of the present invention is to output an image signal by extracting defective image data. Therefore, in the case of normal reproduction, control of display timing is required to synchronize with audio. On the other hand, in the case of fast-forward and fast-reverse, there is no need to synchronize with audio, so that control of display timing is not required.

If the display timing control of the n-th image data is unnecessary (ST16, NO), the n-th image data is continuously output as an image signal that can be output to the display (ST20). When the display timing control of the n-th image data is required (ST16, YE
S), the display timing of the n-th image data is controlled (ST18). That is, when the display time of the n-th image data is reached (ST18, YES), the n-th image data is continuously output as an image signal that can be output to the display (ST20).

Thereafter, n is incremented (ST2).
2) The presence or absence of the n-th image data is determined (ST1).
2). At this time, the n-th image data is image data corresponding to the main frame 2. Therefore, the n-th image data exists (ST12, YES). The n-th image data, that is, the image data corresponding to the main frame 2, does not correspond to the defective image data (ST1).
4, NO). Therefore, the processing after ST16 is continued. By the way, in ST20, instead of the image data corresponding to the main frame 1, the image data corresponding to the main frame 2 is output as an image signal that can be output to the display.

Thereafter, n is incremented (ST2).
2) The presence or absence of the n-th image data is determined (ST1).
2). At this time, the n-th image data is image data corresponding to subframe 1. Therefore, the n-th image data exists (ST12, YES). The n-th image data, that is, the image data corresponding to subframe 1 does not correspond to the defective image data (ST14, N
O). Therefore, the processing after ST16 is continued. Incidentally, in ST20, instead of the image data corresponding to the main frame 2, the image data corresponding to the sub-frame 1 is output as an image signal that can be output to the display.

Thereafter, n is incremented (ST2).
2) The presence or absence of the n-th image data is determined (ST1).
2). At this time, the n-th image data is image data corresponding to subframe 2. Therefore, the n-th image data exists (ST12, YES). The n-th image data, that is, the image data corresponding to the sub-frame 2, corresponds to the defective image data (ST14, YE
S). Therefore, the process proceeds to ST22. During this time,
Image data corresponding to subframe 1 continues to be output as an image signal that can be output to the display.

Thereafter, n is incremented (ST2).
2) The presence or absence of the n-th image data is determined (ST1).
2). At this time, the n-th image data is image data corresponding to sub-frame 3. Therefore, the n-th image data exists (ST12, YES). The n-th image data, that is, the image data corresponding to the sub-frame 3, corresponds to the defective image data (ST14, YE
S). Therefore, the process proceeds to ST22. During this time,
Image data corresponding to subframe 1 continues to be output as an image signal that can be output to the display.

Thereafter, n is incremented (ST2).
2) The presence or absence of the n-th image data is determined (ST1).
2). At this time, the n-th image data is image data corresponding to sub-frame 4. Therefore, the n-th image data exists (ST12, YES). The n-th image data, that is, the image data corresponding to the subframe 4 does not correspond to the defective image data (ST14, N
O). Therefore, the processing after ST16 is continued. Incidentally, in ST20, instead of the image data corresponding to subframe 1, the image data corresponding to subframe 4 is output as an image signal that can be output to the display.

As described above, in the image signal output process 1, the defect image data is omitted and the image signal is output. This eliminates the unsightly image that can be caused by the reproduction of the moving image data including the defective image data. Further, in the image signal output process 1, by controlling the display timing, the synchronization between the image and the sound is maintained after the defective image data is omitted.

Second, an image signal output process 2 will be described with reference to FIGS.

The second image signal output process is started when image data is supplied to the data reproducing unit 114. Of course, this image data is sent to the error correction circuit 112.
Is data that has undergone error correction processing. The image data referred to here is image data corresponding to main frame 1, main frame 2, sub frame 1, sub frame 2, sub frame 3, sub frame 4, and main frame 3.

If the image data is not received by data reproducing section 114 (ST32, NO), the second image signal output process is not started. The image data is stored in the data reproducing unit 1
If accepted in ST14 (YES in ST32), the image signal output process 2 is started.

First, the n-th image data, that is, image data corresponding to main frame 1 is received (ST).
32, YES). At this time, it is determined whether or not the n-th image data, that is, the image data corresponding to the main frame 1 corresponds to the defective image data (ST34). This determination is made based on a notification from the CPU 102 (a notification of the presence of defective image data). Incidentally, the n-th image data at this time, that is, the image data corresponding to the main frame 1 does not correspond to the defective image data (ST3).
4, NO).

If it is determined that the n-th image data does not correspond to the defective image data (ST34, NO), then it is determined whether the display timing control of the n-th image data is necessary (ST36). . When the moving image playback mode of the moving image playback device 10 is the normal playback, control of the display timing is required. On the other hand, when the moving image playback mode of the moving image playback device 10 is fast forward or fast reverse, control of display timing is unnecessary. That is, this determination is
This is performed based on a notification from the PU 102 (notification of an instruction for normal reproduction, fast forward, and fast rewind). As described above, the image signal output processing of the present invention is to output an image signal by extracting defective image data. Therefore, in the case of normal reproduction, control of display timing is required to synchronize with audio. On the other hand, in the case of fast-forward and fast-reverse, there is no need to synchronize with audio, so that control of display timing is not required.

If the display timing control of the n-th image data is unnecessary (ST36, NO), the n-th image data is continuously output as an image signal that can be output to the display (ST40). When the display timing control of the n-th image data is required (ST36, YE
S), the display timing of the n-th image data is controlled (ST38). That is, when the display time of the n-th image data is reached (ST38, YES), the n-th image data is continuously output as an image signal that can be output to the display (ST40).

By the way, in the case of the n-th image data,
The process does not proceed to ST39. The process proceeds to ST39 when defective image data exists in the image data before the n-th image data. If defective image data exists, the defective image data is skipped. As a result, a time lag occurs, and processing for shifting to ST39 occurs. The processing of ST39 will be described later.

After the process of ST40, n is incremented (ST42), and it is determined whether or not the n-th image data exists (ST32). At this time, the n-th image data is
This is image data corresponding to the main frame 2. Therefore, the n-th image data exists (ST32, YE
S). The n-th image data, that is, the image data corresponding to the main frame 2, does not correspond to the defective image data (ST34, NO). Therefore, the processing after ST36 is continued. By the way, in ST40, instead of the image data corresponding to the main frame 1, the image data corresponding to the main frame 2 is output as an image signal that can be output to the display.

Thereafter, n is incremented (ST4).
2), the presence or absence of the n-th image data is determined (ST3)
2). At this time, the n-th image data is image data corresponding to subframe 1. Therefore, the n-th image data exists (ST32, YES). The n-th image data, that is, the image data corresponding to the subframe 1 does not correspond to the defective image data (ST34, N
O). Therefore, the processing after ST36 is continued. By the way, in ST40, instead of the image data corresponding to the main frame 2, the image data corresponding to the sub-frame 1 is output as an image signal that can be output to the display.

Thereafter, n is incremented (ST4).
2), the presence or absence of the n-th image data is determined (ST3)
2). At this time, the n-th image data is image data corresponding to subframe 2. Therefore, the n-th image data exists (ST32, YES). The n-th image data, that is, the image data corresponding to the sub-frame 2, corresponds to the defective image data (ST34, YE
S). Therefore, the process proceeds to ST42. During this time,
Image data corresponding to subframe 1 continues to be output as an image signal that can be output to the display.

Thereafter, n is incremented (ST4).
2), the presence or absence of the n-th image data is determined (ST3)
2). At this time, the n-th image data is image data corresponding to sub-frame 3. Therefore, the n-th image data exists (ST32, YES). The n-th image data, that is, the image data corresponding to the sub-frame 3, corresponds to the defective image data (ST34, YE
S). Therefore, the process proceeds to ST42. During this time,
Image data corresponding to subframe 1 continues to be output as an image signal that can be output to the display.

Thereafter, n is incremented (ST4).
2), the presence or absence of the n-th image data is determined (ST3)
2). At this time, the n-th image data is image data corresponding to sub-frame 4. Therefore, the n-th image data exists (ST32, YES). The n-th image data, that is, the image data corresponding to the sub-frame 4 does not correspond to the defective image data (ST34, N
O). Therefore, the processing after ST36 is continued.

By the way, when the processing shifts to ST38,
The process shifts to ST39 due to the influence of the time lag due to the omission of the defective image data. That is, the image signal currently being output is faded out, and the image signal corresponding to the n-th image data is faded in (ST39). In this case, the image data corresponding to the subframe 1 is faded out, and the image data corresponding to the subframe 4 is faded in. More specifically, the subframe 1 gradually disappears, and the subframe 4 gradually appears.

In ST40, instead of the image data corresponding to subframe 1, the image data corresponding to subframe 4 is output as an image signal that can be output to the display. That is, at this point, the display is switched from subframe 1 to subframe 4.

As described above, in the image signal output process 2, the defect image data is omitted and an image signal is output. This eliminates the unsightly image that can be caused by the reproduction of the moving image data including the defective image data. In the second image signal output process, by controlling the display timing, the synchronization between the image and the sound is maintained after the defective image data is omitted. Furthermore, when the defect image data is omitted, a sense of incongruity that may occur when the display screen is switched can be suppressed by using a method called fade-out / fade-in.

Third, an image signal output process 3 will be described with reference to FIGS.

The third image signal output process is started when image data is supplied to the data reproducing unit 114. Of course, this image data is sent to the error correction circuit 112.
Is data that has undergone error correction processing. The image data referred to here is image data corresponding to main frame 1, main frame 2, sub frame 1, sub frame 2, sub frame 3, sub frame 4, and main frame 3.

If the image data is not received by data reproducing section 114 (NO in ST52), the third image signal output process is not started. The image data is stored in the data reproducing unit 1
If accepted at 14 (ST52, YES), the image signal output process 3 is started.

First, the n-th image data, that is, image data corresponding to main frame 1 is received (ST).
52, YES). At this time, it is determined whether or not the n-th image data, that is, the image data corresponding to the main frame 1 corresponds to the defective image data (ST54). This determination is made based on a notification from the CPU 102 (a notification of the presence of defective image data). Incidentally, the n-th image data at this time, that is, the image data corresponding to the main frame 1, does not correspond to the defective image data (ST5).
4, NO).

If it is determined that the n-th image data does not correspond to the defective image data (ST54, NO), then the necessity of display timing control of the n-th image data is determined (ST56). . When the moving image playback mode of the moving image playback device 10 is the normal playback, control of the display timing is required. On the other hand, when the moving image playback mode of the moving image playback device 10 is fast forward or fast reverse, control of display timing is unnecessary. That is, this determination is
This is performed based on a notification from the PU 102 (notification of an instruction for normal reproduction, fast forward, and fast rewind). As described above, the image signal output processing of the present invention is to output an image signal by extracting defective image data. Therefore, in the case of normal reproduction, control of display timing is required to synchronize with audio. On the other hand, in the case of fast-forward and fast-reverse, there is no need to synchronize with audio, so that control of display timing is not required.

If the display timing control of the n-th image data is unnecessary (ST56, NO), the n-th image data is continuously output as an image signal that can be output to the display (ST60). If display timing control of the n-th image data is required (ST56, YE
S), the display timing of the n-th image data is controlled (ST58). That is, when the display time of the n-th image data comes (ST58, YES), the n-th image data is continuously output as an image signal that can be output to the display (ST60).

Incidentally, in the case of the n-th image data,
The process does not shift to ST59. The process proceeds to ST59 when there is defective image data in the image data before the n-th image data. If defective image data exists, the defective image data is skipped. As a result, a time lag occurs, and a process of shifting to ST59 occurs. The process of ST59 will be described later.

After the process of ST60, n is incremented (ST62), and it is determined whether or not the n-th image data exists (ST52). At this time, the n-th image data is
This is image data corresponding to the main frame 2. Therefore, the n-th image data exists (ST52, YE
S). The n-th image data, that is, the image data corresponding to the main frame 2 does not correspond to the defective image data (ST54, NO). Therefore, the processing after ST56 is continued. Incidentally, in ST60, instead of the image data corresponding to the main frame 1, the image data corresponding to the main frame 2 is output as an image signal that can be output to the display.

Thereafter, n is incremented (ST6).
2), the presence or absence of the n-th image data is determined (ST5).
2). At this time, the n-th image data is image data corresponding to subframe 1. Therefore, the n-th image data exists (ST52, YES). The n-th image data, that is, the image data corresponding to subframe 1 does not correspond to the defective image data (ST54, N
O). Therefore, the processing after ST56 is continued. Incidentally, in ST60, instead of the image data corresponding to the main frame 2, the image data corresponding to the sub-frame 1 is output as an image signal that can be output to the display.

Thereafter, n is incremented (ST6).
2), the presence or absence of the n-th image data is determined (ST5).
2). At this time, the n-th image data is image data corresponding to subframe 2. Therefore, the n-th image data exists (ST52, YES). The n-th image data, that is, the image data corresponding to the subframe 2 corresponds to the defective image data (ST54, YE
S). Therefore, the process proceeds to ST62. During this time,
Image data corresponding to subframe 1 continues to be output as an image signal that can be output to the display.

Thereafter, n is incremented (ST6).
2), the presence or absence of the n-th image data is determined (ST5).
2). At this time, the n-th image data is image data corresponding to sub-frame 3. Therefore, the n-th image data exists (ST52, YES). The n-th image data, that is, the image data corresponding to the sub-frame 3, corresponds to the defective image data (ST54, YE
S). Therefore, the process proceeds to ST62. During this time,
Image data corresponding to subframe 1 continues to be output as an image signal that can be output to the display.

Thereafter, n is incremented (ST6).
2), the presence or absence of the n-th image data is determined (ST5).
2). At this time, the n-th image data is image data corresponding to sub-frame 4. Therefore, the n-th image data exists (ST52, YES). The n-th image data, that is, the image data corresponding to the subframe 4 does not correspond to the defective image data (ST54, N
O). Therefore, the processing after ST56 is continued.

By the way, when the processing shifts to ST58,
The process proceeds to ST59 due to the influence of the time lag due to the omission of the defective image data. That is, the image signal currently being output is wiped out, and the image signal corresponding to the n-th image data is wiped in (S
T59). In this case, the image data corresponding to subframe 1 is wiped out, and the image data corresponding to subframe 4 is wiped in. More specifically, the display area of the sub-frame 1 gradually decreases, and the display area of the sub-frame 4 gradually increases.

In ST60, instead of the image data corresponding to sub-frame 1, the image data corresponding to sub-frame 4 is output as an image signal that can be output to the display. That is, at this point, the display is switched from subframe 1 to subframe 4.

As described above, in the image signal output process 3, the defect image data is omitted and the image signal is output. This eliminates the unsightly image that can be caused by the reproduction of the moving image data including the defective image data. In the third image signal output process, by controlling the display timing, the synchronization between the image and the sound is maintained after the defective image data is omitted. Further, when the defect image data is omitted, by using the technique of wipe-out / wipe-in, a sense of incongruity that may occur when the display screen is switched can be suppressed.

[0077]

According to the present invention, it is possible to provide a moving image reproducing apparatus and a moving image reproducing method capable of eliminating the unsightly image that can be caused by reproducing moving image data including defective image data.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a moving image reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a base image (main frame) and a change (sub-frame) of the base image.

FIG. 3 is a diagram illustrating an image of an encoding method of digital image data by MPEG.

FIG. 4 is a flowchart illustrating an image signal output process 1;

FIG. 5 is a flowchart illustrating an image signal output process 2;

FIG. 6 is a flowchart illustrating an image signal output process 3;

FIG. 7 is a diagram for specifically explaining image signal output processing Nos. 1, 2, and 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 10 ... Video reproduction apparatus 102 ... CPU 102a ... Bus 104 ... Memory 106 ... Optical disk drive part 108 ... Optical pickup 108a ... Semiconductor laser 110 ... Servo control circuit 112 ... Error correction circuit 114 ... Data reproduction part 116 ... Operation part

Claims (14)

[Claims] 1. A moving image reproducing apparatus that reproduces moving image data that is generated by inter-frame correlation compression and to which an error correction code is added and that includes a plurality of image data corresponding to a plurality of frames. Error correction means for correcting an error of the image data to which the error correction code is added based on the correction code; and if the error of the image data cannot be corrected by the error correction means, the error cannot be corrected. A moving image reproducing apparatus comprising: detecting means for detecting the image data as defective image data; and reproducing means for reproducing the image data by extracting the defective image data detected by the detecting means. . 2. An image data generated by inter-frame correlation compression and to which an error correction code is added, wherein main image data corresponding to a main frame, and first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In a moving image reproducing apparatus for reproducing moving image data, based on the error correction code, error correction means for correcting an error of the image data to which the error correction code is added, and an error of the image data corrected by the error correction means Detecting means for detecting, as defective image data, the image data for which the error cannot be completely corrected, When the second image data is detected as the defective image data by the detection means, the second image data is skipped, and the third image data is reproduced following the first image data. A moving image reproducing apparatus, comprising: reproducing means. 3. Image data generated by inter-frame correlation compression and to which an error correction code has been added, the main image data corresponding to a main frame, and the first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In a moving image reproducing apparatus for reproducing moving image data, based on the error correction code, error correction means for correcting an error of the image data to which the error correction code is added, and an error of the image data corrected by the error correction means Detecting means for detecting, as defective image data, the image data for which the error cannot be completely corrected, When the second image data is detected as the defective image data by the detection means, the first image data is faded out and the third image data is faded in, and the first image data is faded. And a reproducing means for reproducing the third image data following the above. 4. Image data generated by inter-frame correlation compression and to which an error correction code has been added, the main image data corresponding to a main frame, and the first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In a moving image reproducing apparatus for reproducing moving image data, based on the error correction code, error correction means for correcting an error of the image data to which the error correction code is added, and an error of the image data corrected by the error correction means Detecting means for detecting, as defective image data, the image data for which the error cannot be completely corrected, When the second image data is detected as the defective image data by the detection means, the first image data is wiped out and the third image data is wiped in, and the first image data is wiped out. Followed by the third
And a reproducing means for reproducing the image data. 5. An image data generated by an inter-frame correlation compression and to which an error correction code is added, the main image data corresponding to a main frame, and the first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In a moving image reproducing apparatus for reproducing moving image data, based on the error correction code, error correction means for correcting an error of the image data to which the error correction code is added, and an error of the image data corrected by the error correction means Detecting means for detecting, as defective image data, the image data for which the error cannot be completely corrected, When the second image data is detected as the defective image data by the detection means, the first image data is reproduced during a reproduction time period of the first and second image data, and the first image data is reproduced. A moving image reproducing apparatus, comprising: reproducing means for reproducing the third image data next to the image data. 6. Image data generated by inter-frame correlation compression and to which an error correction code has been added, wherein main image data corresponding to a main frame, and first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In a moving image reproducing apparatus for reproducing moving image data, based on the error correction code, error correction means for correcting an error of the image data to which the error correction code is added, and an error of the image data corrected by the error correction means Detecting means for detecting, as defective image data, the image data for which the error cannot be completely corrected, When the second image data is detected as the defective image data by the detection means, the first image data is faded out during the reproduction time period of the second image data, and the third image data is reproduced. A moving image reproducing apparatus comprising: reproducing means for performing fade-in and reproducing the third image data following the first image data. 7. Image data generated by inter-frame correlation compression and to which an error correction code has been added, the main image data corresponding to a main frame, and the first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In a moving image reproducing apparatus for reproducing moving image data, based on the error correction code, an error correction unit for correcting an error of the image data to which the error correction code is added, and an error of the image data corrected by the error correction unit Detecting means for detecting, as defective image data, the image data for which the error cannot be completely corrected, When the second image data is detected as the defective image data by the detection means, the first image data is wiped out during the reproduction time period of the second image data, and the third image data is deleted. And a playback unit for wiping in and playing back the third image data following the first image data. 8. A moving picture reproducing method for reproducing moving picture data which is generated by inter-frame correlation compression and to which an error correction code is added, and which includes a plurality of image data corresponding to a plurality of frames, A first step of detecting, as a defective image data, the image data in which the error cannot be completely corrected when the error of the image data to which the error correction code is added cannot be corrected based on the correction code; A second step of retrieving the image data by skipping the defective image data detected in the first step. 9. Image data generated by inter-frame correlation compression and to which an error correction code has been added, wherein main image data corresponding to a main frame, and first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In the moving image reproducing method for reproducing moving image data, based on the error correction code, if an error of the image data to which the error correction code is added cannot be completely corrected, the image data that cannot be completely corrected is replaced with a defective image. A first step of detecting as the data, and the first step converts the second image data into the defective image data. A second step of skipping the second image data and reproducing the third image data following the first image data if detected. Playback method. 10. Image data generated by inter-frame correlation compression and to which an error correction code has been added, the main image data corresponding to a main frame, and the first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In the moving image reproducing method for reproducing moving image data, based on the error correction code, if an error of the image data to which the error correction code is added cannot be completely corrected, the image data that cannot be completely corrected is replaced with a defective image. A first step of detecting as the data, the first step converts the second image data into the defective image data. A second step of fading out the first image data and fading in the third image data, and reproducing the third image data following the first image data. And a video playback method comprising: 11. Image data generated by inter-frame correlation compression and to which an error correction code has been added, the main image data corresponding to a main frame, and the first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In the moving image reproducing method for reproducing moving image data, based on the error correction code, if the error of the image data to which the error correction code is added cannot be corrected, the image data that cannot be corrected completely is replaced with a defective image. A first step of detecting as the data, the first step converts the second image data into the defective image data. A second step of wiping out the first image data and wiping in the third image data to reproduce the third image data following the first image data And a video playback method comprising: 12. An image data generated by inter-frame correlation compression and to which an error correction code is added, wherein main image data corresponding to a main frame, and first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In the moving image reproducing method for reproducing moving image data, based on the error correction code, if the error of the image data to which the error correction code is added cannot be corrected, the image data that cannot be corrected completely is replaced with a defective image. A first step of detecting as the data, the first step converts the second image data into the defective image data. Is detected, the first image data is reproduced during the reproduction time period of the first and second image data, and the second image data is reproduced after the first image data. And a video playback method comprising: 13. Image data generated by inter-frame correlation compression and to which an error correction code has been added, wherein the main image data corresponds to a main frame, and the first image data corresponds to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In the moving image reproducing method for reproducing moving image data, based on the error correction code, if an error of the image data to which the error correction code is added cannot be completely corrected, the image data that cannot be completely corrected is replaced with a defective image. A first step of detecting as the data, and the first step converts the second image data into the defective image data. Is detected, the first image data is faded out and the third image data is faded in during the reproduction time period of the second image data, and the third image data is faded in after the first image data. 3. A moving image reproducing method, comprising: a second step of reproducing the image data of No. 3. 14. Image data generated by inter-frame correlation compression and to which an error correction code has been added, the main image data corresponding to a main frame, and the first image data corresponding to a first sub-frame following the main frame. Image data, second image data corresponding to a second sub-frame following the first sub-frame, and third image data corresponding to a third sub-frame following the second sub-frame. In the moving image reproducing method for reproducing moving image data, based on the error correction code, if the error of the image data to which the error correction code is added cannot be corrected, the image data that cannot be corrected completely is replaced with a defective image. A first step of detecting as the data, the first step converts the second image data into the defective image data. Is detected, the first image data is wiped out and the third image data is wiped in during the reproduction time period of the second image data, and the third image data is wiped-in following the first image data. 3. A moving image reproducing method, comprising: a second step of reproducing the image data of No. 3.