KR101431546B1 - Encoding and decoding method for Multi-view Video and apparatus thereof - Google Patents

Encoding and decoding method for Multi-view Video and apparatus thereof Download PDF

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KR101431546B1
KR101431546B1 KR1020080026315A KR20080026315A KR101431546B1 KR 101431546 B1 KR101431546 B1 KR 101431546B1 KR 1020080026315 A KR1020080026315 A KR 1020080026315A KR 20080026315 A KR20080026315 A KR 20080026315A KR 101431546 B1 KR101431546 B1 KR 101431546B1
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block mode
picture
skip block
current picture
skip
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KR1020080026315A
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Korean (ko)
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KR20080097914A (en
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박광훈
박민우
서덕영
김규헌
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삼성전자주식회사
경희대학교 산학협력단
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Priority claimed from US12/112,520 external-priority patent/US8917775B2/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/597Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/172Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a picture, frame or field
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock

Abstract

The present invention relates to a method of encoding and decoding a multi-view moving picture. The multi-view moving picture coding method according to the present invention decides whether or not the current picture is an anchor picture. If the current picture is an anchor picture, By selectively allowing the application of the skip block mode, it is possible to improve image quality and improve coding efficiency.
Multi-view video encoding anchor picture skip block mode

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for encoding and decoding a multi-view video,

The present invention relates to a method and apparatus for improving the overall coding efficiency by improving the picture quality of an anchor picture in multi-view video coding.

The multi-view video coding (MVC) standard improves coding performance based on MPEG-4 part 10 Advanced Video Coding (AVC) which is an existing video standard. Joint Scalable Video Coding (JSVC) performs hierarchical B-pictures coding to support temporal scalability and performs inter-view prediction to improve coding efficiency .

The present invention provides a picture quality enhancement method and apparatus for selectively enhancing picture quality and coding efficiency by selectively applying a skip block mode to an anchor picture when encoding and decoding multi-view moving pictures.

According to an aspect of the present invention, there is provided a method of encoding a multi-view moving picture, comprising: determining whether a current picture is an anchor picture; Wherein when the current picture is an anchor picture, skipping a skip block mode when coding the blocks constituting the current picture, and skipping a block to which the skip block mode is applied, do.

According to another aspect of the present invention, there is provided a method of encoding a multi-view moving picture, the method comprising: determining whether the current picture is allowed to be skipped when the current picture is an anchor picture; And selectively applying the skip block mode when coding the blocks constituting the current picture according to the determination, wherein skipping of the block to which the skip block mode is applied is performed.

According to another aspect of the present invention, there is provided a method of encoding multi-view moving pictures, comprising: a step of skipping a block to which the skip block mode is applied, And restores the image data of the area corresponding to the motion information obtained based on the motion information of the neighboring blocks of the block to which the skip block mode is applied, as it is.

According to another aspect of the present invention, there is provided a method of encoding multi-view moving images, the method comprising: determining whether to apply the skip block mode based on a picture type of the current picture; Is of the P type, it does not allow the skip block mode.

According to an aspect of the present invention, there is provided a method of encoding a multi-view moving picture according to the present invention, wherein the skip block mode is one of a skip block mode applied to MPEG 4, H.264, and MVC (Multiview Coding) do.

According to an aspect of the present invention, there is provided a method of encoding multi-view moving images, the method comprising: determining whether to allow the skip block mode based on at least one of a current input image, a reference image, a quantization parameter, .

According to an aspect of the present invention, there is provided an apparatus for encoding multi-view moving pictures, the apparatus comprising: an anchor picture determination unit for determining whether a current picture is an anchor picture; And an encoding unit which does not apply a skip block mode when encoding the blocks constituting the current picture when the current picture is an anchor picture and skipping the encoding of the block to which the skip block mode is applied do.

According to another aspect of the present invention, there is provided a multi-view moving picture encoding apparatus including: a skip block mode permission determination unit for determining whether to allow a skip block mode in encoding the current picture if the current picture is an anchor picture; And a coding unit for selectively applying the skip block mode when coding the blocks constituting the current picture according to the determination, and skipping the coding for the block to which the skip block mode is applied.

According to an aspect of the present invention, there is provided a multi-view moving picture encoding apparatus, wherein the encoding unit skips coding for a block to which the skip block mode is applied, The image data of the area in the same area as the block to which the skip block mode of the current picture is applied, or the image data of the area corresponding to the motion information obtained based on the motion information of the neighboring blocks in the block to which the skip block mode is applied, .

According to an aspect of the present invention, there is provided a method of decoding a multi-view moving picture comprising: determining whether a current picture is an anchor picture; When the current picture is an anchor picture, not applying a skip block mode in decoding the blocks constituting the current picture, and skipping the decoding in the block to which the skip block mode is applied .

According to another aspect of the present invention, there is provided a method for decoding a multi-view moving picture, the method comprising the steps of: determining whether a skip block mode is permitted in decoding the current picture if the current picture is an anchor picture; And selectively applying the skip block mode when decoding the blocks constituting the current picture according to the determination, wherein the decoding is skipped for the block to which the skip block mode is applied.

According to an aspect of the present invention, there is provided an apparatus for decoding a multi-view moving picture, the apparatus comprising: an anchor picture determination unit for determining whether a current picture is an anchor picture; And a decoding unit that does not apply a skip block mode when decoding the blocks constituting the current picture when the current picture is an anchor picture, and skips decoding of the block to which the skip block mode is applied do.

According to another aspect of the present invention, there is provided an apparatus for decoding a multi-view moving picture, the apparatus comprising: a skip block mode permission determiner for determining whether to allow a skip block mode in decoding the current picture if the current picture is an anchor picture; And a decoding unit for selectively applying the skip block mode when decoding the blocks constituting the current picture according to the determination. The decoding unit skips the decoding for the block to which the skip block mode is applied.

The method includes determining whether the current picture is an anchor picture; Wherein when the current picture is an anchor picture, skipping a skip block mode when coding the blocks constituting the current picture, and skipping a block to which the skip block mode is applied, And a computer-readable recording medium on which a program for implementing a coding method of multi-view moving pictures is recorded.

According to another aspect of the present invention, there is provided a method of decoding a current picture, the method comprising the steps of: determining whether the current picture is allowed to be skipped when the current picture is an anchor picture; And selectively applying the skip block mode when coding the blocks constituting the current picture according to the determination, and skipping the coding for the block to which the skip block mode is applied. The present invention can also be achieved by a computer-readable recording medium having recorded thereon a program for implementing a method of encoding a point video.

 The method includes determining whether the current picture is an anchor picture; Wherein if the current picture is an anchor picture, applying a skip block mode is not applied in decoding the blocks constituting the current picture, and skipping decoding is applied to a block to which the skip block mode is applied The present invention can also be achieved by a computer-readable recording medium on which a program for implementing a decoding method of multi-view moving pictures is recorded.

According to another aspect of the present invention, there is provided a method of decoding a current picture, the method comprising the steps of: determining whether a current picture is an anchor picture; And selectively applying the skip block mode when decoding the blocks constituting the current picture according to the determination, wherein decoding is skipped for the block to which the skip block mode is applied The present invention can also be achieved by a computer-readable recording medium on which a program for implementing a method of decoding a point video is recorded.

When coding a multi-view video, the skip block mode is selectively applied to an anchor picture which allows only inter-view reference, thereby improving picture quality and coding efficiency.

FIG. 1 shows a prediction structure when a size of a group of pictures (GOP) in a temporal direction is 8, as an example when there are eight views in multi-view video coding. Here, S0, S1, S2, S3, S4, S5, S6 and S7 each represent one view, and T0, T1, T2, T3,. . . , And T100 represents an image in the time direction.

In FIG. 1, prediction is performed using a hierarchical B-picture structure in the coding in the temporal direction of each view, and images in the first time (T0) of each view and 8 (= N) T8, T16, T24, ..., which are pictures separated by frames, that is, N pictures separated by GOP size in the time direction. . The images are called anchor pictures.

In the case of anchor pictures, only the prediction from the view direction is performed. From the S0 view in the same time zone S2 view, the S1 view performs prediction from the S0 view and the S2 view in the same time zone. Also, the S4 view performs prediction from the S0 view in the same time zone, and the S3 view predicts from the S2 view and the S4 view in the same time zone. In addition, the S6 view performs prediction from the S4 view in the same time zone, and the S5 view predicts from the S4 view and the S6 view in the same time zone. Also, since the S7 view is the last view, only the prediction is performed from the S6 view in the same time zone.

In a non-anchor picture, temporal-direction prediction is basically performed. In the exemplary embodiment shown in FIG. 1, the predictions from neighboring views are performed together in every second view, S1, S3, S5, and S7. That is, the S1 view predicts from the S0 view and the S2 view, the S3 view from the S1 view and the S4 view, and the S5 view from the S3 view and the S6 view.

The anchor picture is a basic picture referred to by a picture other than an anchor picture, and is a picture that influences prediction of another anchor picture. Therefore, the picture quality of the picture referring to the anchor picture is affected depending on the picture quality of the anchor picture, and the continuous prediction efficiency is affected. If the picture quality of the anchor picture is bad, the picture quality is deteriorated due to the continuous influence on the prediction.

Hereinafter, the influence of the picture quality of the anchor picture on the overall coding efficiency will be described with reference to Figs. 2 (a) to 2 (f).

2 (a) is an anchor picture-in-T8 / S2 (P 0) of the type P picture from view S2 of T0 / S2 (P 0) and the T8 time in S2 view of a T0 time P anchor picture of the picture type is an anchor picture except T0 / S2 (P 0) and T8 / S2 of tO / S0 anchor picture to reference (P 0) (I 0), and affects all picture in the GOP. In other words, when the anchor pictures T0 / S2 (P 0) and T8 / S2 quality of (P 0) decreases, the influence on the entire picture in the GOP, after all have a significant effect on the overall prediction efficiency and coding performance sequence will be.

In reference to Figure 2 (b) through Fig. 2 (f) below, when the anchor pictures T0 / S2 (P 0) and T8 / S2 quality of (P 0) is deteriorates, and the other anchor pictures and non-anchor picture We examine the effect on the pictures.

Figure 2 (b) the anchor pictures T0 / S2 (P 0) and T8 / S2 when the degradation, of (P 0), anchor picture T0 / S2 (P 0) and T8 / S2 (P 0) as shown in the anchor picture for direct reference to T0 / S1 (B 1), T0 / S3 (B 1), T0 / S4 (P 0), T8 / S1 (B 1), T8 / S3 (B 1), and T8 / the prediction efficiency of S4 (P 0) is the deterioration of the image quality occurs away.

In addition, FIG. 2 (c) the anchor pictures T0 / S2 (P 0) the image quality is degraded as in the T8 / S2 (P 0), the image quality is more anchor pictures T0 / S4 (P 0) lower than that with reference to and T8 / S4 anchor picture of T0 / S5 (B 1) that refers to the (P 0), T0 / S6 (P 0), T8 / S5 (B 1), and T8 / S6 prediction efficiency of (P 0) is The image quality deteriorates further.

Thus, with reference to the ripple of the prediction efficiency there is generated continuously, the prediction efficiency of the image quality is more degraded the anchor pictures T0 / S6 (P 0) and T8 / S6 more apart (P 0) as shown in (d) of Figure 2, an anchor picture of T0 / S7 (P 0), and T8 / S7 (P 0) that is the further away from the prediction efficiency image quality is continuously lowered.

2 (e) and 2 (f), the picture quality of a non-anchor picture which basically performs prediction with reference to an anchor picture in a situation where the picture quality of the anchor pictures is degraded is also continuously decreased .

For example, a look at the prediction of the picture is not the anchor in view S2 sequentially,, view S2 at T4 time for the image quality, refer to the lowering anchor pictures T0 / S2 (P 0) and T8 / S2 (P 0) the T4 / S2 (B 1) of the picture at the prediction efficiency is a reduction in image quality occurs away. In addition, the anchor and the anchor picture (T0 / S2 (P 0) , T8 / S2 (P 0)) with the picture T2 / S2 (B 2) and a picture that references a picture T4 / S2 (B 1) caused the deterioration of the image quality prediction efficiency of T6 / S2 (B 2) will further decrease. In addition, the prediction efficiency of the remaining B3 pictures of the remaining S2 will continue to decrease.

As described above, in the case of multi-view video coding, the image quality of the anchor picture significantly affects other images in the respective GOPs, thus greatly affecting the overall coding efficiency of the moving image sequence.

In a typical video coding method such as H.264, there is a skip block mode among the block modes for performing inter-frame prediction. In the skip block mode, a block at the same position in a predicted frame is directly imported, or a block size region is directly extracted from a displacement of a motion vector obtained through prediction using motion vectors of neighboring blocks. It is a mode that does not code block data.

For example, the skip block mode in MPEG-4 is a mode in which macroblock information is not transmitted at all but pixels that are spatially in the same position, i.e., a pixel whose motion vector is 0 is used as an encoded image.

In addition, the skip block mode in H.264 / AVC does not use a pixel whose motion vector corresponds to 0, that is, spatially the same position, but a motion vector is predicted and motion compensation is performed based on the result And a prediction signal is used as an encoded image.

In this manner, in the skip block mode, coding is not performed on the video data of the corresponding block at the time of coding, and motion information of motion data of the current block, And the image data of the area corresponding to the derived motion information is directly acquired and the corresponding block is restored.

Therefore, when the skip block mode is selected in the anchor picture, the difference between the level of the luminance signal or the color difference signal generated between the views is not included in the residual image and is not coded. Therefore, picture quality deterioration may occur in an anchor picture portion selected in a skip block mode, and the deterioration of picture quality generated in these anchor pictures is highly likely to be propagated to other pictures referring to the anchor picture.

In multi-view video coding, the illumination compensation method (IC) applied to the international standard method can perform compensation by predicting the illumination compen- tation offset from the neighboring blocks even in the skip block mode. However, if there is no luminance compensation value in the neighboring blocks, picture quality deterioration occurs in the block in which the coding is performed in the skip block mode.

In addition, as a problem in terms of subjective image quality, even if luminance compensation is performed on the block to which the skip block mode is applied, there is no compensation value for the color difference signal, so image quality deterioration may occur severely.

For example, when coding a Race1 QVGA 30 Hz image sequence in the multi-view video coding software JMVM version 2.3, the luminance signal compensation method used in the multi-view video coding international standard method is used and the quantization parameter is set to 37 And comparing the picture quality of the decoded picture of the anchor picture of the second view coded by the coded block view, a significant difference in picture quality or blocking artifacts occurs in the selected area in the skip block mode.

Such image deterioration phenomenon can be easily found by comparing the results of outputting the decoded image for each component, i.e., Y, U, and V components. Due to such deterioration in image quality, the prediction efficiency of the pictures for performing the prediction coding with reference to the image to which the skip block mode is applied is reduced.

When prediction coding is performed on the anchor picture of the 4th view with reference to the anchor picture of the 2nd view coding the Race1 QVGA 30Hz video sequence, if the picture quality deterioration of the anchor picture of the 2th view is the anchor picture of the 4th view It can be confirmed that the error is propagated.

When the deterioration of image quality occurs in the anchor picture as described above, the coding efficiency of the entire sequence to be currently coded is deteriorated as a whole because the other pictures refer to the anchor picture.

In the present invention, the picture quality deterioration occurring in the anchor picture of the multi-view moving picture coding is eliminated or minimized to improve the efficiency of prediction of the picture referring to the anchor picture, and in order to improve the overall coding efficiency and the subjective picture quality, And selectively permits the application of the block mode.

In an embodiment of the present invention, when the current picture is an anchor picture, a scheme of not allowing a skip block mode in coding the current picture is adopted.

In another embodiment of the present invention, when the current picture is an anchor picture, a scheme of selectively allowing a skip block mode according to a picture type of a current picture is adopted.

In another embodiment of the present invention, a scheme of allowing a skip block mode to be applied to an anchor picture is flexibly allowed, and a flag is used to transmit whether skip block mode related information is coded.

3 is a block diagram illustrating a multi-view video encoding apparatus according to the present invention.

The multi-view moving picture coding apparatus shown in FIG. 3 includes an anchor picture determination unit 320 and an encoding unit 340.

The anchor picture determination unit 320 determines whether the current picture is an anchor picture by using the anchor picture determination information of the current image, for example, the header information of the input image. If the current picture is an anchor picture, the coding unit 340 transmits a control signal to the coding unit 340 so that the current picture does not apply the skip block mode.

When receiving a control signal for not applying the skip block mode to the current picture from the anchor picture determination unit 320, the encoding unit 340 performs encoding on the current picture without applying the skip block mode. When receiving a control signal for not applying the skip block mode to the current picture from the anchor picture determination unit 320 or receiving a control signal for permitting the application of the skip block mode, The encoding is performed according to the mode. For example, when encoding a current picture, coding of the current picture is skipped, motion information is derived from motion data of neighboring blocks of the current block or image data of a region in the same position as the current block, , The image data of the area corresponding to the derived motion information is taken as it is and the corresponding block is restored.

Only information on a reference picture to be used for reconstruction of the current picture is encoded. The encoding unit 340 may use an existing video encoder supporting the skip block mode. When the skip block mode is applied to the current picture, the encoding unit 340 encodes and outputs information indicating that the skip block mode is applied.

When the skip block mode is not applied to the current picture, the encoding unit 340 encodes and outputs information indicating that the skip block mode is not applied. Alternatively, when the current picture is an anchor picture, information indicating whether or not the skip block mode is applied to the current picture, for example, a syntax element, may not be coded, i.e., inserted into the bitstream.

As an example of a syntax for displaying a skip, in the multi-view video coding standard specification, in the case of the CABAC (Context-based Adaptive Binary Arithmetic Coding) method, "mb_skip_flag" indicating whether or not the current block is a block to which the skip block mode is applied Quot; mb_skip_run "for coding the number of consecutive skip blocks in the case of a Context-based Adaptive Variable Length Coding (CAVLC) method.

Therefore, when the current picture is an anchor picture, as an example of not coding information of the skip block mode, in the case of using the CABAC method in multi-view video coding, it is possible to use the CAVLC method without coding "mb_skip_flag" In this case, there is a method of not coding "mb_skip_run" information.

Table 1 is an example of a syntax modified to allow the present embodiment to be implemented with the "Slice data syntax" used for multi-view video coding, as an example for implementing an embodiment of the present invention shown in FIG.

Figure 112008020614566-pat00001

In Table 1, "anchor_pic_flag" is information included in the Network Abstraction Layer (NAL) unit of the current slice, and indicates whether the current picture is an anchor picture or not. For example, if the current picture is an anchor picture, 'anchor_pic_flag = 1'.

That is, in the present embodiment, when the current picture is an anchor picture, a scheme of skipping the coding for the current picture, which does not apply the skip block mode, is adopted. Therefore, when the current picture is an anchor picture, it is not necessary to code "mb_skip_flag" and "mb_skip_run" This is because, if the current picture is an anchor picture in the decoder, it can be determined that the skip block mode is not applied to the current picture.

It is also possible to use a separate flag indicating whether or not the skip block mode is applied to the current block so as to be compatible with the existing multi-view video coding standard.

4 is a flowchart illustrating an image encoding method performed by the multi-view video encoding apparatus shown in FIG.

In the embodiment shown in FIG. 4, in order to control whether the skip block mode is applied to an anchor picture, when the current picture is an anchor picture, the application of the skip block mode is not permitted.

In step 420, it is determined whether or not the current picture is an anchor picture. For example, it is determined whether or not the current picture is an anchor picture based on the header information of the input image.

In step 440, when the current picture is an anchor picture, a skip block mode is not applied to the current picture when the current picture is coded. On the other hand, if the current picture is not an anchor picture, the existing coding process is performed on the current picture, and the application of the skip block mode is permitted.

5 is a block diagram illustrating a multi-view video encoding apparatus according to another embodiment of the present invention.

The multi-view moving picture coding apparatus shown in FIG. 5 includes a skip block mode permitting unit 520 and an encoding unit 540.

The skip block mode permitting unit 520 receives the anchor picture determination information and the picture type information, and determines whether or not to permit the skip block mode for the current picture. For example, using the header information of the input image, it is determined whether or not the current picture is an anchor picture and whether the skip block mode is applied to the current picture according to the picture type of the current picture. For example, if the current picture is an anchor picture and the current picture is a P picture, skip block mode is not allowed for the current picture. However, if the current picture is an anchor picture and the current picture is a B picture, a skip block mode is allowed for the current picture.

This is because, when the skip block mode is not allowed, the residual image and the prediction information are coded, so that the bit amount is relatively increased as compared with the case of allowing the skip block mode. Therefore, if the method of not allowing the skip block mode for all anchor pictures is used, the amount of bits can be significantly increased.

1, a skip block mode is not allowed in the case of a P picture that continuously affects the prediction of another anchor picture, and a skip block mode is set in a case of a B picture that does not affect the prediction of another anchor picture Allow.

In the case of the B picture, prediction is performed from the S0 view and the S2 view in the same time zone as in the S1 view of Fig. 1, for example, even if the skip block mode is allowed, the image deterioration is not large.

If the current picture is an anchor picture and the current picture is a P picture, the skip block mode permission determination unit 520 outputs a control signal to the coding unit 540 to prevent the coding unit 540 from applying the skip block mode to the current picture send.

When receiving the control signal for not applying the skip block mode to the current picture from the skip block mode permission determination unit 520, the encoding unit 540 performs encoding on the current picture without applying the skip block mode do. When receiving a control signal for not applying the skip block mode to the current picture from the skip block mode permission determining unit 520 or receiving a control signal for allowing the application of the skip block mode, Apply the skip block mode.

The encoder 540 may use an existing video encoder supporting the skip block mode. When the skip block mode is applied to the current picture, the encoding unit 540 encodes and outputs information indicating that the skip block mode is applied.

If the skip block mode is not applied to the current picture, the encoding unit 540 encodes and outputs information indicating that the skip block mode is not applied. Alternatively, if the current picture is an anchor picture and the picture is a P picture, information indicating whether the skip block mode is applied to the current picture, for example, a syntax element is not coded, that is, can do.

As an example of the implementation of the multi-view video device shown in FIG. 5, "Slice data syntax" in multi-view video coding can be modified as shown in Table 2 below.

Figure 112008020614566-pat00002

Here, "anchor_pic_flag" is information contained in the NAL Unit of the current slice and indicates whether the current picture is an anchor picture. For example, if the current picture is an anchor picture, 'anchor_pic_flag = 1'. If the current picture is an anchor picture and it is a P picture, skip block mode application information "mb_skip_flag" and "mb_skip_run" need not be coded.

According to the embodiment shown in FIG. 5, a test is performed on a RValge image sequence of QVGA size by using a luminance signal compensation method for JMVM2.3, which is a reference source code of Multiview Coding (MVC) The simulation results for the average bit rate of each view of Y, U, and V versus the average PSNR of each view are shown in FIGS. 6, 7, and 8, respectively.

According to the simulation result, when the skip block mode is not applied to the P picture among the anchor pictures, it can be confirmed that the bit is reduced by about 1% at a low bit rate. As the picture quality of these anchor pictures is improved, the prediction efficiency of pictures referring to P pictures as well as an anchor picture becomes higher than that of pictures that are anchor pictures As the enhancements are made, it can be seen that the overall bit amount for the coded sequence is reduced.

The average PSNR for the entire sequence is 0.11 dB improved in Y component, 0.25 dB improved in U component, and 0.51 dB improved in V component at low bit rate. At other bit rates, the performance is the same or slightly better.

FIG. 9 is a flowchart illustrating an image encoding method performed in the multi-view moving picture device shown in FIG.

9, it is determined whether or not the current picture is an anchor picture and the picture type of the current picture in order to control whether or not the skip block mode is applied to the anchor picture. Mode is not allowed.

In step 920, it is determined whether the current picture is an anchor picture and, if the current picture is an anchor picture, whether the picture type of the current picture is a P picture. For example, whether or not the current picture is an anchor picture and the picture type are determined based on the header information of the input image.

In step 940, if the current picture is an anchor picture and the current picture is a P picture, the skip block mode is not applied to the current picture. On the other hand, when the current picture is not an anchor picture or the current picture is an anchor picture but is not a P picture, the existing coding process is performed on the current picture, and a skip block mode is applied.

10 is a block diagram illustrating a multi-view video encoding apparatus according to another embodiment of the present invention.

The multi-view moving picture coding apparatus shown in FIG. 10 includes a skip block mode permission determination unit 1020 and an encoding unit 1040.

In this embodiment, in order to control the application of the skip block mode to the current picture, a current picture to be input and a reference picture (list 0, list 1), a quantization parameter, a user input, and anchor picture information referenced by the current picture And determines whether or not the skip block mode for the current picture is permitted.

The skip block mode permission decision unit 1020 calculates the absolute value of the difference between the average of the picture to be referred to when the current picture is an anchor picture and the average of the current picture to be coded for each component of Y, U, and V . When the sum of these absolute values is equal to or larger than the threshold value T, the application of the skip block mode is not permitted. For example, a T value of 1 can be applied.

Alternatively, it is possible to determine whether to apply the skip block mode according to the thresholds KY, KU, and KV for the respective components by setting the absolute values of the differences of the respective components as TY, TU, TV and the like.

Also, the skip block mode is not allowed when the combination of the absolute values TY, TU, and TV of the respective component-specific differences becomes equal to or greater than a predetermined value. For example, it may be determined whether to apply the skip block mode according to whether T = SQRT (TY2 + TU2 + TV2) or T = average (TY + TU + TV) have.

Alternatively, it may be determined whether or not the skip block mode is applied, depending on the current quantization parameter QP value. If the current QP value is less than or equal to the predetermined threshold QPT, then the skip block mode is allowed (QP < = QPT), otherwise skip block mode is not allowed.

In addition, it is possible to selectively determine whether or not the skip block mode is applied to the current picture by receiving external input information, for example, a user's input. That is, when the current picture is an anchor picture, the on / off information of "allow_skip_flag &quot; can be selected by the user as an input parameter at the time of encoding.

Alternatively, as the input information by the user, the values of KY, KU, KV, K, and QPT, which are the input values, may be selected by the user as input parameters during encoding.

In addition, the skip block mode permitting unit 1020 may selectively determine whether to apply the skip block mode according to various criteria based on the input information.

When the skip block mode permission determination unit 1020 determines not to allow the skip block mode for the current picture, the control unit 1040 transmits a control signal to the encoding unit 1040 so as not to apply the skip block mode when encoding the current picture.

On the other hand, when it is determined to allow the skip block mode for the current picture, the coding unit 1040 selectively applies the skip block mode according to the existing image coding process.

The coding unit 1040 does not apply the skip block mode when receiving a control signal for not applying the skip block mode to the current picture from the skip block mode permission determining unit 1020. [ If a control signal for not applying the skip block mode to the current picture is received from the skip block mode permission determination unit 1020 or a control signal for allowing the application of the skip block mode is received, Apply the skip block mode.

The encoding unit 1040 may use an existing video encoder supporting the skip block mode. When the skip block mode is applied to the current picture, the encoding unit 1040 encodes and outputs information indicating that the skip block mode is applied.

When the skip block mode is not applied to the current picture, the encoding unit 1040 encodes and outputs information indicating that the skip block mode is not applied.

Optionally, the skip block mode permission determination unit 1040 may encode and output information indicating whether or not the skip block mode is allowed.

In order to implement the multi-view moving picture coding apparatus shown in FIG. 10, the "Slice data syntax" in the multi-view moving picture coding can be modified by a method using the following Table 3 and a flag ("allow_skip_flag").

Figure 112008020614566-pat00003

"anchor_pic_flag" is information contained in the NAL Unit of the current slice and indicates whether the current picture is an anchor picture. For example, if the current picture is an anchor picture, 'anchor_pic_flag = 1' is indicated.

According to an embodiment of the present invention, when the current picture is an anchor picture, "allow_skip_flag" may be added to code information about whether to allow the skip block mode in the current anchor picture. Quot; allow_skip_flag "can be coded as 1 when the skip block mode is permitted, and" allow_skip_flag "

In addition, as an embodiment associated with the changed "slice header syntax ", the" slice data syntax "

Figure 112008020614566-pat00004

If the current picture is not an anchor picture or an anchor picture and "allow_skip_flag" is 1, skip block mode permission information is coded. If "allow_skip_flag" is 0 in an anchor picture, skip block permission information is coded I never do that.

11 is a flowchart for explaining an image encoding method performed in the multi-view moving picture device shown in FIG.

In step 1120, in order to determine whether or not the skip block mode is allowed in the anchor picture, the current picture to be input and the reference picture (list 0, list 1), the quantization parameter, the user input, and the anchor picture information referenced by the current picture Whether or not the skip block mode for the current picture is allowed is determined.

In addition, it is possible to determine whether to apply the skip block mode according to various criteria performed in the skip block mode permission determination unit 1020 of FIG. Optionally, information indicating whether the skip block mode is applied is generated and output.

In step 1140, when it is determined not to apply the skip block mode to the current picture, the skip block mode is not applied to the current picture. On the other hand, when it is determined to allow the skip block mode for the current picture, the existing encoding process is performed on the current picture, and the skip block mode is selectively applied. Optionally, information indicating whether the skip block mode is applied is generated and output.

12 is a block diagram illustrating a multi-view video decoding apparatus corresponding to the multi-view video encoding apparatus of FIG.

The multi-view moving picture decoding apparatus shown in FIG. 12 includes an anchor picture determination unit 1220 and a decoding unit 1240.

The anchor picture determination unit 1220 determines whether or not the current picture is an anchor picture using the anchor picture determination information of the input coded bitstream, for example, the header information of the input bitstream, It is determined whether or not the skip block mode is permitted. If the current picture is an anchor picture, a control signal indicating that the skip block mode is not applied to the current picture is transmitted to the decoding unit 1240. Alternatively, it is determined whether or not the application of the skip block mode is permitted from information indicating whether the skip block mode is applied to the current picture included in the input bitstream.

On the other hand, when the current picture is not an anchor picture, the decoding unit 1240 selectively determines whether or not the skip block mode is applied according to an existing video decoding process.

When receiving a control signal indicating that the skip block mode is not applied to the current picture from the anchor picture determination unit 1220, the decoding unit 1240 decodes the current picture data. When receiving a control signal indicating that the skip block mode is not applied to the current picture from the skip block mode application determination unit 1220 or receiving a control signal indicating that the application of the skip block mode is permitted, And selectively decodes the data. For example, when the application of the skip block mode is permitted to the video data of the current picture, the decoding unit 1240 decodes the information indicating whether or not the skip block mode is applied to the current block, And decodes the data. The decoding unit 1240 may use an existing video decoder supporting the skip block mode.

13 is a flowchart illustrating an image decoding method performed in the multi-view moving picture decoding apparatus shown in FIG.

In step 1320, it is determined whether or not the application of the skip block mode for the current picture is permitted, depending on whether the current picture is an anchor picture or not. For example, it is determined whether or not the current picture is an anchor picture based on the header information of the input bitstream.

In step 1340, when the current picture is an anchor picture, decoding according to the skip block mode is not applied in decoding the current picture. On the other hand, when the current picture is not an anchor picture, the existing decoding process is performed on the current picture. That is, information indicating whether the skip block mode is applied is decoded, and the current picture data is decoded accordingly.

FIG. 14 is a block diagram illustrating a multi-view video decoding apparatus corresponding to the multi-view video encoding apparatus shown in FIG.

The multi-view moving picture coding apparatus shown in FIG. 14 includes a skip block mode permission determination unit 1420 and a decoding unit 1440.

The skip block mode permission determination unit 1420 extracts anchor picture information and picture type information from the input encoded bit stream to determine whether a skip block mode is applied to the current picture. For example, it is determined from the header information of the input bitstream whether the current picture is an anchor picture and the picture type of the current picture, thereby determining whether or not the skip block mode is allowed for the current picture. For example, if the current picture is an anchor picture and the current picture is a P picture, it is determined that the skip block mode is not allowed for the current picture.

If it is determined that the skip block mode is not allowed for the current picture, the skip block mode permission determining unit 1420 transmits information indicating that the skip block mode is not applied to the current picture to the decoding unit 1440 . On the other hand, if the current picture is not an anchor picture, or is not an anchor picture but a P picture, for example a B picture, the decoder 1440 performs decoding according to the existing moving picture decoding process.

When receiving information indicating that the skip block mode is not applied to the current picture from the skip block mode application determination unit 1420, the decoding unit 1440 regards that the skip block mode is not applied to the current picture, And decodes the video data of the current picture. When the information indicating that the skip block mode is not allowed for the current picture is received from the skip block mode permission determining unit 1420 or information indicating that the skip block mode is permitted is received, And selectively applies a skip block mode. For example, information indicating whether a skip block mode is applied to a current block is decoded, and decoding is performed on the video data of the current picture.

The decoding unit 1440 may use an existing video decoder supporting the skip block mode.

FIG. 15 is a flowchart for explaining an image decoding method performed in the multi-view moving picture decoding apparatus shown in FIG.

In step 1520, it is determined whether or not the current picture is an anchor picture and, if the current picture is an anchor picture, whether the picture type of the current picture is a P picture. For example, whether or not the current picture is an anchor picture and the picture type are determined based on the input bitstream header information.

If the current picture is an anchor picture and the current picture is a P picture, it is determined in step 1540 that a skip block mode is not applied to the current picture, and skip block mode is not applied when decoding the current picture. On the other hand, if the current picture is not an anchor picture or the current picture is an anchor picture but not a P picture, the existing decoding process is performed on the current picture. For example, information indicating whether a skip block mode is applied to the current picture is decoded, and decoding is performed based on the decoded information.

16 is a block diagram illustrating a multi-view video decoding apparatus corresponding to the multi-view video encoding apparatus shown in FIG.

The multi-view moving picture coding apparatus shown in FIG. 16 includes a skip block mode permission determination unit 1620 and a decoding unit 1640.

The skip block mode permission determination unit 1620 extracts anchor picture information from the input bitstream to determine whether the current picture is an anchor picture or not. If the current picture is an anchor picture, it decodes the skip block mode permitting information and determines whether or not the skip block mode is allowed for the current picture.

If it is determined that the skip block mode is not allowed for the current picture, the skip block mode permission determination unit 1620 transmits information indicating that the skip block mode is not applied to the current picture to the decryption unit 1640 . Alternatively, information indicating whether or not the skip block mode is allowed for the current picture is transmitted to the decrypting unit 1640.

When receiving the information indicating that the skip block mode is not allowed for the current picture from the skip block mode permission determination unit 1620, the decoding unit 1640 regards that the skip block mode is not applied to the current picture, And decodes the video data of the current picture. When information indicating that the skip block mode is not applied to the current picture is received from the skip block mode application decision unit 1620 or information indicating that the application of the skip block mode is permitted is received, And selectively applies a skip block mode. For example, information indicating whether or not a skip block mode is applied to the current picture is decoded, and decoding is performed on the video data of the current picture. The decoding unit 1640 may use an existing video decoder supporting the skip block mode.

FIG. 17 is a flowchart illustrating an image decoding method performed in the multi-view moving picture decoding apparatus shown in FIG.

In step 1720, it is determined whether the current picture is an anchor picture. If the current picture is an anchor picture, information indicating whether or not the skip block mode is applied to the current picture is decoded. It is determined whether or not the application of the block mode is permitted.

If it is determined in step 1740 that the skip block mode is not applied to the current picture, the skip block mode is not applied in decoding the current picture. On the other hand, if it is determined that the current picture is allowed to be applied to the skip block mode, the existing decoding process is performed on the current picture. For example, information indicating whether a skip block mode is applied to the current picture is decoded, and decoding is performed based on the decoded information.

1 is a diagram showing a prediction structure of multi-view video coding.

Figs. 2 (a) to 2 (f) are diagrams for explaining the influence of the picture quality of the anchor picture on the overall coding efficiency.

3 is a block diagram illustrating a multi-view video encoding apparatus according to an embodiment of the present invention.

4 is a flowchart illustrating an encoding method performed by the multi-view video encoding apparatus shown in FIG.

5 is a block diagram illustrating a multi-view video encoding apparatus according to another embodiment of the present invention.

6 is a diagram showing a simulation result according to an embodiment of the present invention.

7 is a diagram showing a result of a simulation according to an embodiment of the present invention.

8 is a diagram showing a simulation result according to an embodiment of the present invention.

FIG. 9 is a flowchart illustrating an encoding method performed in the multi-view video encoding apparatus shown in FIG.

10 is a block diagram illustrating a multi-view video encoding apparatus according to another embodiment of the present invention.

11 is a flowchart illustrating a coding method performed by the multi-view video coding apparatus shown in FIG.

12 is a block diagram illustrating a multi-view video decoding apparatus according to an embodiment of the present invention.

13 is a flowchart illustrating a decoding method performed in the multi-view moving picture decoding apparatus shown in FIG.

14 is a block diagram illustrating a multi-view video decoding apparatus according to an embodiment of the present invention.

FIG. 15 is a flowchart illustrating a decoding method performed in the multi-view moving picture decoding apparatus shown in FIG.

16 is a block diagram illustrating a multi-view video decoding apparatus according to an embodiment of the present invention.

FIG. 17 is a flowchart illustrating a decoding method performed in the multi-view moving picture decoding apparatus shown in FIG.

Claims (24)

  1. A method of encoding a multi-view video,
    Determining whether the current picture is an anchor picture;
    And when the current picture is an anchor picture, not applying a skip block mode when encoding the blocks constituting the current picture,
    And skipping the coding for the block to which the skip block mode is applied.
  2. A method of encoding a multi-view video,
    If the current picture is an anchor picture, determining whether to allow a skip block mode in coding the current picture;
    And selectively applying the skip block mode when coding the blocks constituting the current picture according to the determination,
    And skipping the coding for the block to which the skip block mode is applied.
  3. 3. The method according to claim 1 or 2,
    Wherein the skip encoding is skipped for the block to which the skip block mode is applied and the image data in the same area as the block to which the skip block mode is applied in the reference image used for restoring the current picture, And restores the image data of the region corresponding to the motion information obtained based on the motion information of the neighboring blocks of the motion vector information.
  4. 3. The method of claim 2,
    Determines whether to allow the application of the skip block mode based on a picture type of the current picture and does not allow the skip block mode when the picture type of the current picture is P type, Way.
  5. 3. The method of claim 2,
    Wherein the skip block mode is one of a skip block mode applied to MPEG 4, H.264, and MVC (Multiview Coding) standards.
  6. 3. The method of claim 2,
    And determines whether to allow the skip block mode based on at least one of a current input image, a reference image, a quantization parameter, and external input information.
  7. A multi-view video encoding apparatus comprising:
    An anchor picture determination unit that determines whether the current picture is an anchor picture;
    And an encoding unit which does not apply a skip block mode when encoding the blocks constituting the current picture when the current picture is an anchor picture,
    And skips the coding for the block to which the skip block mode is applied.
  8. A multi-view video encoding apparatus comprising:
    A skip block mode permission decision unit for deciding whether or not to allow a skip block mode in coding the current picture if the current picture is an anchor picture;
    And an encoding unit for selectively applying the skip block mode when encoding the blocks constituting the current picture according to the determination,
    And skips the coding for the block to which the skip block mode is applied.
  9. 9. The method according to claim 7 or 8,
    Wherein the coding unit skips the coding for the block to which the skip block mode is applied and extracts the image data of the same area as the block to which the skip block mode of the current picture is applied in the reference image used for restoring the current picture, And restores the video data of the area corresponding to the motion information obtained based on the motion information of the neighboring blocks of the block to which the skip block mode is applied, as it is.
  10. 9. The method of claim 8,
    Wherein the skip block mode permission determination unit determines whether or not the skip block mode is allowed based on a picture type of the current picture and if the picture type of the current picture is a P type, .
  11. 9. The method of claim 8,
    Wherein the skip block mode is one of a skip block mode applied to MPEG 4, H.264, and Multiview Coding (MVC) standards.
  12. 9. The method of claim 8,
    Wherein the skip block mode permission determination unit determines whether to permit the skip block mode based on at least one of a current input image, a reference image, a quantization parameter, and external input information.
  13. A method for decoding a multi-view video,
    Determining whether the current picture is an anchor picture;
    If the current picture is an anchor picture, not applying a skip block mode in decoding the blocks constituting the current picture,
    And skips the decoding for the block to which the skip block mode is applied.
  14. A method for decoding a multi-view video,
    If the current picture is an anchor picture, determining whether to allow a skip block mode in decoding the current picture;
    And selectively applying the skip block mode when decoding the blocks constituting the current picture according to the determination,
    And skips the decoding for the block to which the skip block mode is applied.
  15. The method according to claim 13 or 14,
    Wherein the skip decoding unit skips decoding of a block to which the skip block mode is applied and extracts, from a reference image used for restoring the current picture, image data of the same area as the block to which the skip block mode is applied, In which the video data of the area corresponding to the motion information obtained based on the motion information of the neighboring blocks of the block to which the skip block mode is applied is used as it is.
  16. 15. The method of claim 14,
    Determines whether to allow the application of the skip block mode based on the picture type of the current picture and does not allow the skip block mode when the picture type of the current picture is P type, Way.
  17. 15. The method of claim 14,
    Wherein the skip block mode is one of a skip block mode applied to MPEG4, H.264, and MVC (Multiview Coding) standards.
  18. A multi-view video decoding apparatus comprising:
    An anchor picture determination unit that determines whether the current picture is an anchor picture;
    And a decoding unit which does not apply a skip block mode when decoding the blocks constituting the current picture when the current picture is an anchor picture,
    And skips decryption for a block to which the skip block mode is applied.
  19. A multi-view video decoding apparatus comprising:
    A skip block mode permission decision unit for deciding whether or not to allow a skip block mode in decoding the current picture if the current picture is an anchor picture;
    And a decoding unit for selectively applying the skip block mode when decoding the blocks constituting the current picture according to the determination,
    And skips decryption for a block to which the skip block mode is applied.
  20. 20. The method according to claim 18 or 19,
    Wherein the decoding unit skips decoding of the block to which the skip block mode is applied and extracts the image data of the same area as the block to which the skip block mode of the current picture is applied in the reference image used for restoring the current picture, And restores the video data of the area corresponding to the motion information obtained based on the motion information of the neighboring block of the block to which the skip block mode of the current picture is applied, using the video data as it is.
  21. 20. The method of claim 19,
    Wherein the skip block mode permitting unit determines whether or not the skip block mode is permitted based on the picture type of the current picture and if the picture type of the current picture is P type, .
  22. 20. The method of claim 19,
    Wherein the skip block mode is one of a skip block mode applied to MPEG 4, H.264, and MVC (Multiview Coding) standards.
  23. A computer-readable recording medium having recorded thereon a program for implementing a method of encoding a multi-view moving picture according to any one of claims 1, 2, and 4 to 6.
  24.       A computer-readable recording medium having recorded thereon a program for implementing a method for decoding a multi-view moving picture according to any one of claims 13, 14, 16, and 17.
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