WO2009114986A1

WO2009114986A1 - Method, device for scaling motion vector and encoding, decoding method and system

Info

Publication number: WO2009114986A1
Application number: PCT/CN2008/073864
Authority: WO
Inventors: 林永兵
Original assignee: 华为技术有限公司
Priority date: 2008-03-20
Filing date: 2008-12-30
Publication date: 2009-09-24
Also published as: CN101540902B; CN101540902A

Abstract

A method and device for scaling the motion vector, and encoding, decoding method and system are disclosed. The method for scaling the motion vector includes the following steps: performing the coordinate transform for a first motion vector based on the coordinate offset between a bottom field of the interlaced scanning image and a top field of the interlaced scanning image to obtain a second motion vector; scaling the second motion vector to obtain a third motion vector; performing the coordinate inverse transform for the third motion vector to obtain a fourth motion vector based on the coordinate offset. The embodiment of the present invention performs half-pixel compensation, in other words performs coordinate transform for the motion vector before or after being scaled based on the offset in the spatial position of the top filed image and the bottom field image in order to transform to the coordinate system that reflects the actual position relation between the field images. The scaling process for the motion vector is performed, thereby the motion model is more fitted, the accuracy of the motion vector scaling is ensured, the prediction accuracy of the motion vector is improved, and the encoding compression efficiency of the field images is improved.

Description

Scaling method and apparatus for motion vector, and encoding and decoding method and system. The present application claims a method and device for encoding a motion vector, codec method and method, which is filed on March 20, 2008 and whose application number is 200810102353. The priority of the Chinese application of the system, the entire contents of which is incorporated herein by reference.

Technical field

The present invention relates to the field of multimedia technologies, and in particular, to a motion vector scaling method, apparatus, and encoding and decoding method and system. Background technique

In the video coding compression standard, motion vector prediction techniques are employed to reduce the bit overhead required to transmit motion vectors. Motion vector prediction techniques include spatial motion vector prediction and time domain motion vector prediction. In the spatial motion vector prediction, the motion vector of the current macroblock may be predicted according to the motion vector of the adjacent macroblock in the spatial position with the current macroblock; and in the time domain motion vector prediction, according to the current macroblock The motion vector of the adjacent or similar macroblock at the time axis position predicts the motion vector of the current macroblock, and the obtained motion vector is used for motion compensation prediction.

Regardless of spatial motion vector prediction or time domain motion vector prediction, motion vector scaling is commonly used in motion vector prediction techniques. The motion vector is one of the most important data in the compressed code stream. The accuracy of the motion vector scaling affects the accuracy of the motion vector and further affects the video coding compression performance. In general, the motion vector scaling follows the rigid body linear motion model, and the corresponding scaling is performed according to the time domain distance.

In general, video sequences include progressive sequences and interlaced sequences. The images constituting the video sequence include a progressive scan frame image, that is, a progressive scan image and an interlaced scan field image, that is, an interlaced image, and the 1 frame can be divided into 2 fields, that is, a top field and a bottom field, and a top field and a bottom field image. There is a time difference between this time, which is equal to half of the frame period. The top field consists of odd rows of pixels, while the bottom field consists of even rows of pixels. The progressive sequence consists only of frame images, and the interlaced sequence may include frame images and field images.

In the prior art, the same scaling process is performed for both the frame image and the field image. However, since the field image is different from the frame image, there is a spatial positional offset between the top and bottom fields of the field image. (Offset half a pixel), the same motion vector scaling process as the frame image scaling reduces the accuracy of the motion vector scaling, resulting in a reduction in the coding compression efficiency of the field image. Summary of the invention

Embodiments of the present invention provide a method and apparatus for scaling a motion vector, and a coding and decoding method and system, which are used to improve the accuracy of motion vector scaling and improve the coding compression efficiency of a field image.

An embodiment of the present invention provides a method for scaling a motion vector, including:

Performing coordinate transformation on the first motion vector according to a coordinate offset between the bottom field image and the top field image to obtain a second motion vector;

And scaling the second motion vector to obtain a third motion vector;

Performing inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector.

An embodiment of the present invention provides a motion vector scaling apparatus, including:

a first transform module, configured to perform coordinate transformation on the first motion vector according to a coordinate offset between the bottom field image and the top field image to obtain a second motion vector;

a scaling module, configured to scale the second motion vector to obtain a third motion vector; and a second transform module, configured to perform inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth Motion vector.

An embodiment of the present invention provides an encoding method, including:

In the encoding process, when performing motion vector prediction processing, the step of scaling the motion vector includes: performing coordinate transformation on the first motion vector according to a coordinate offset between the bottom field image and the top field image to obtain a second motion Vector; scaling the second motion vector to obtain a third motion vector; performing inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector;

The fourth motion vector is used for motion compensation prediction processing.

The embodiment of the invention provides a decoding method, including:

In the decoding process, when performing motion vector prediction processing, the step of scaling the motion vector includes: performing coordinate transformation on the first motion vector according to a coordinate offset between the bottom field image and the top field image to obtain a second motion vector And scaling the second motion vector to obtain a third motion vector And inversely transforming the third motion vector according to the coordinate offset to obtain a fourth motion vector;

The fourth motion vector is used for motion compensation prediction processing.

An embodiment of the present invention provides an encoding system, including:

a first scaling device, configured to: scale a first motion vector to obtain a fourth motion vector; and first prediction means, configured to perform motion compensation prediction processing according to the fourth motion vector obtained by the first scaling device in the encoding process ;

The first scaling device includes:

An embodiment of the present invention provides a decoding system, including:

a second scaling device, configured to scale the first motion vector to obtain a fourth motion vector; and second prediction means, configured to perform motion compensation prediction processing according to the fourth motion vector obtained by the second scaling device in the decoding process ;

The second scaling device includes:

According to the foregoing technical solution, the embodiment of the present invention performs half-pixel compensation on the motion vector before and after the scaling according to the offset of the top field image and the bottom field image in spatial position, or performs coordinate transformation, and transforms between the reflected field images. In the coordinate system of the real positional relationship, the scaling process of the motion vector is performed, which is more in line with the motion model, which ensures the accuracy of the motion vector scaling, improves the motion vector prediction accuracy, and improves the coding compression efficiency of the field image.

Specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. DRAWINGS

1 is a schematic flow chart of a first embodiment of a method for scaling a motion vector according to the present invention; FIG. 2 is a schematic diagram of zooming a motion vector in a first embodiment of a method for scaling a motion vector according to the present invention;

3 is a schematic flow chart of a second embodiment of a method for scaling a motion vector according to the present invention; FIG. 4 is a schematic diagram of zooming a motion vector in a second embodiment of a method for scaling a motion vector according to the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of a motion vector scaling apparatus according to the present invention; FIG.

6 is a schematic flow chart of an embodiment of an encoding method according to the present invention;

7 is a schematic flowchart of an embodiment of a decoding method according to the present invention;

8 is a schematic structural diagram of an embodiment of an encoding system according to the present invention;

FIG. 9 is a schematic structural diagram of an embodiment of a decoding system according to the present invention. detailed description

In the scaling method of the motion vector according to the embodiment of the present invention, the first motion vector is coordinate-transformed according to the coordinate offset between the bottom field image and the top field image, and the second motion vector can be obtained; and the second motion vector is scaled. Therefore, a third motion vector can be obtained; and the third motion vector is inversely transformed according to the coordinate offset to obtain a fourth motion vector for subsequent motion compensation prediction. The scaling method of the motion vector in the embodiment of the present invention can ensure the accuracy of the motion vector scaling, thereby improving the motion vector prediction accuracy and the encoding compression efficiency of the field image.

FIG. 1 is a schematic flow chart of a first embodiment of a scaling method of a motion vector according to the present invention. This embodiment is applicable to performing motion vector prediction based on airspace, and includes the following steps:

Assume that the scaled motion vector is MV1 and the scaled motion vector is MV2.

Step 101: Determine a coordinate offset delt between the top field image and the bottom field image.

For interlaced images, the top field image and the bottom field image have a half-pixel offset in the vertical direction, and the corresponding coordinate offset delt=0.5, in units of integer pixels (pixel);

Step 102: Perform coordinate transformation on the vertical component of the scaled motion vector MV1 according to the coordinate offset delt to obtain a motion vector MV1 '. The scaled MV1 is the motion vector in the original coordinate system; the corresponding coordinate transformed MV1 ' is the motion vector in the new coordinate system. The operation of coordinate transformation specifically includes the following cases (coordinate transformation only for the vertical component of MV1):

When the motion vector MV1 is from top->bottom (the top field points to the bottom field), MV1 '=MV1 +delt; when the motion vector MV1 is from bottom->top (the bottom field points to the top field), MV1 '=MV1 -delt; Vector MV1 consists of top->top (top field points to top field), MV1 '=MV1;

When the motion vector MV1 is from bottom->bottom (the bottom field points to the bottom field), MV1 '=MV1. It can be seen from the above that when the parity of the field image where the start and end points of the motion vector are different is different, the influence of the coordinate offset delt needs to be considered;

Step 103: Linearly scale the MV1 ' after the coordinate transformation according to the direction of the MV1 ' according to the rigid body uniform linear motion model to obtain the motion vector MV2'.

Where MV2'=scalexMV1 '; where scale is the scaling factor, which is related to the temporal distance of the motion vector before and after scaling, which is the length of the motion vector projection on the time axis.

Step 104: Perform inverse coordinate transformation on the vertical component of the scaled motion vector MV2' according to the coordinate offset delt to obtain a motion vector MV2.

The scaled motion vector MV2' is the motion vector in the new coordinate system; the inverse MV2 of the corresponding coordinate is the motion vector in the original coordinate system. The operation of coordinate transformation specifically includes the following cases (coordinate transformation only for the vertical component of MV2'):

When motion vector MV2 consists of top->bottom (top field points to bottom field), MV2=MV2'-delt; when motion vector MV2 is from bottom->top (bottom field points to top field), MV2=MV2'+delt; Vector MV2 consists of top->top (top field points to top field), MV2=MV2';

When the motion vector MV2 is from bottom->bottom (the bottom field points to the bottom field), MV2=MV2'. It can be seen from the above that when the parity of the field image where the start and end points of the motion vector are different is different, the influence of the coordinate offset delt needs to be considered.

In this embodiment, according to the offset delt of the top field image and the bottom field image in the spatial position, the unit is the same as the unit of the motion vector, and the half-pixel compensation, or coordinate transformation, is performed on the motion vectors MV1 and MV2' before and after the scaling. Transforming to the coordinate system 0' reflecting the true positional relationship between the field images, the motion vector scaling process is more consistent with the motion model, which ensures the accuracy of the motion vector scaling, improves the motion vector prediction accuracy, and thus improves the field image. The coding compression efficiency. FIG. 2 is a schematic diagram showing scaling of a motion vector in a first embodiment of a scaling method of a motion vector according to the present invention. The original coordinate system is 0, the new coordinate system is 0', the solid circle represents the top field image, and the open circle represents the bottom field image. The difference between the two is that the position of the bottom field is different. In the new coordinate system, there is a half pixel difference in the vertical direction between the top field and the bottom field. The new coordinate system reflects the true positional relationship between the field images, and the scaling of the motion vectors should be performed in the new coordinate system. In the figure, time represents the time axis; y axis represents the position of the pixel in the vertical direction; top represents the top field image; bottom represents the bottom field image; delt is the coordinate offset; MV1 and MV2 are the motion vectors in the coordinate system 0 respectively MV1 'and MV2' are the motion vectors of MV1 and MV2 transformed to the coordinate system 0', respectively; scale is the scaling factor, in the illustrated case, scale=3. In the new coordinate system, the scaled motion vector MV2' overlaps with the scaled motion vector MV1'.

Further, in this embodiment, in step 101, if interpolation processing is applied to the field image, the corresponding coordinate offset is calculated as follows: If 1/4 interpolation is used, the coordinate offset delt=0.5x4 =2 , the unit is 1 / 4 pixels, which means that half a pixel is equivalent to 2 1/4 samples. For other precision interpolation methods, you can analogize.

Further, in this embodiment, when the scaled motion vector is different from the motion vector direction before scaling, the scaling factor scale involved in step 103 may be a negative number.

In this embodiment, the above motion vector describes the motion of the pixel. Further, the motion vector can also be used to describe the motion of a block or a macro block (MB). Blocks and macroblocks consist of a certain number of pixels. A macroblock consists of 16x16 pixels, and a macroblock can be divided into blocks.

FIG. 3 is a schematic flow chart of a second embodiment of a method for scaling a motion vector according to the present invention. This embodiment is suitable for performing time domain based motion vector prediction. Compared with the previous embodiment, step 103 in the previous embodiment becomes:

In step 103', the MV1 ' after the coordinate transformation is linearly scaled along the direction parallel to MV1 ' according to the rigid body uniform linear motion model, and the motion vector MV2' is obtained.

The scaled motion vector MV1 'is located at a different time domain position from the start of the scaled motion vector MV2', but has a corresponding relationship in the spatial domain position.

FIG. 4 is a schematic diagram showing scaling of a motion vector in a second embodiment of a scaling method of a motion vector according to the present invention. The original coordinate system is 0, the new coordinate system is 0', the solid circle represents the top field image, and the open circle represents the bottom field image. The difference between the two is that the position of the bottom field is different. In the new coordinate system, top There is a half pixel difference in the vertical direction between the field and the bottom field. The new coordinate system reflects the true positional relationship between the field images, and the scaling of the motion vectors should be performed in the new coordinate system. In the figure, time represents the time axis; y axis represents the position of the pixel in the vertical direction; top represents the top field image; bottom represents the bottom field image; delt is the coordinate offset; MV1 and MV2 are the motion vectors in the coordinate system 0 respectively MV1 'and MV2' are motion vectors transformed from MV1 and MV2 to coordinate system 0', respectively; scale is a scaling factor, in the illustrated case, scale=1/3. In the new coordinate system, the scaled motion vector MV2' is parallel to the scaled motion vector MV1'.

In the embodiment of the scaling method of the motion vector of the present invention, according to the offset of the top field image and the bottom field image in the spatial position, the motion vector of the motion vector before and after the scaling is compensated by the half pixel, and then the motion vector is scaled. The accuracy of the motion vector scaling improves the motion vector prediction accuracy, thereby improving the coding compression efficiency of the field image.

FIG. 5 is a schematic structural diagram of an embodiment of a scaling apparatus for a motion vector according to the present invention. The embodiment includes a first transform module 10, a scaling module 20, and a second transform module 30 that are sequentially connected. The first transform module 10 is configured to perform coordinate transformation on the first motion vector by using a coordinate offset between the bottom field image and the top field image to obtain a second motion vector. The scaling module 20 is configured to use the second motion vector. Zooming to obtain a third motion vector; the second transform module 30 is configured to perform inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector.

In the embodiment of the zooming apparatus of the motion vector of the present invention, the first transform module and the second transform module respectively perform half pixel compensation on the motion vectors before and after scaling according to the offset of the top field image and the bottom field image in spatial position. Then, the scaling process of the motion vector by the scaling module can ensure the accuracy of the motion vector scaling, improve the motion vector prediction accuracy, and improve the coding compression efficiency of the field image.

Further, as shown in FIG. 5, the first transform module 10 in this embodiment may include a first identification unit 11 and a first transform unit 12 that are connected to each other. The first identifying unit 11 is configured to identify a direction of the first motion vector; the first transforming unit 12 is configured to use the first recognition unit 11 and the coordinate offset to the first motion. The vertical component of the vector is coordinate transformed to obtain a second motion vector. The second transform module 30 may include a second identification unit 31 and a second transform unit 32 that are connected to each other. The second identifying unit 31 is configured to identify a direction of the third motion vector; the second transform unit 32 is configured to use the recognition result of the second identifying unit 31 and the coordinate offset The quantity is coordinate-transformed to the vertical component of the third motion vector to obtain a fourth motion vector.

FIG. 6 is a schematic flowchart diagram of an embodiment of an encoding method according to the present invention. In the encoding process, when the motion vector prediction process is performed, the step of scaling the motion vector includes: Step 601: Perform coordinates on the first motion vector according to the coordinate offset between the bottom field image and the top field image. Transforming to obtain a second motion vector;

Step 602: Perform scaling on the second motion vector to obtain a third motion vector. Step 603: Perform inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector.

The fourth motion vector obtained in step 603 can be further used for motion compensation prediction. Therefore, when the motion compensation prediction process is performed, the following steps may be further included:

Step 604: The fourth motion vector is used for motion compensation prediction processing in the encoding process. In the encoding process, when performing motion vector prediction processing, the motion vector is scaled, that is, coordinate transformation is performed on the first motion vector according to the coordinate offset between the bottom field image and the top field image, a second motion vector; performing a scaling process on the second motion vector to obtain a third motion vector; performing inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector; The vector is used in motion compensation prediction processing. The embodiment ensures the accuracy of the motion vector scaling, thereby improving the motion vector prediction accuracy and the coding compression efficiency of the field image, and further improving the coding efficiency.

FIG. 7 is a schematic flowchart diagram of an embodiment of a decoding method according to the present invention. In this embodiment, when performing motion vector prediction processing in the decoding process, the step of scaling the motion vector includes:

Step 701: Perform coordinate transformation on the first motion vector according to a coordinate offset between the bottom field image and the top field image to obtain a second motion vector.

Step 702: Perform scaling on the second motion vector to obtain a third motion vector. Step 703: Perform inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector.

The fourth motion vector obtained in step 703 can be further used for motion compensation prediction. Therefore, when the motion compensation prediction process is performed, the following steps may be further included:

Step 704: The fourth motion vector is used for motion compensation prediction processing in a decoding process. In this embodiment, during the decoding process, when the motion vector prediction process is performed, the motion vector is performed. The scaling process, that is, performing coordinate transformation on the first motion vector according to the coordinate offset between the bottom field image and the top field image, to obtain a second motion vector; and scaling the second motion vector to obtain the third motion Vector; performing inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector; and using the fourth motion vector in the motion compensation prediction process. The embodiment ensures the accuracy of the motion vector scaling, thereby improving the motion vector prediction accuracy, and the coding compression efficiency of the field image, and further improving the decoding efficiency.

FIG. 8 is a schematic structural diagram of an embodiment of an encoding system according to the present invention. This embodiment includes a first scaling device 1 and a first prediction device 2 that are connected to each other. The first scaling device 1 is configured to scale the first motion vector to obtain a fourth motion vector. The first prediction device 2 is configured to perform motion compensation prediction according to the fourth motion vector obtained by the first scaling device 1 during the encoding process. deal with. The first scaling device 1 may include a first transform module 10, a scaling module 20, and a second transform module 30 that are sequentially connected. The first transform module 10 is configured to perform coordinate transformation on the first motion vector according to the coordinate offset between the bottom field image and the top field image to obtain a second motion vector; and the scaling module 20 is configured to use the second motion The vector is scaled to obtain a third motion vector. The second transform module 30 is configured to perform inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector.

In the above embodiment of the coding system of the present invention, the first transform module and the second transform module in the first scaling device respectively perform half-pixel on the motion vector before and after the scaling according to the offset of the top field image and the bottom field image in spatial position. After the compensation, the scaling process is performed by the scaling module, and finally the motion compensation prediction process in the encoding process is performed by the first prediction device according to the fourth motion vector, which can ensure the accuracy of the motion vector scaling and improve the motion vector prediction accuracy. Thereby, the coding compression efficiency of the field image is improved, and the coding efficiency is further improved.

FIG. 9 is a schematic structural diagram of an embodiment of a decoding system according to the present invention. This embodiment includes a second scaling device 3 and a second prediction device 4 that are connected to each other. The second scaling device 3 is configured to scale the first motion vector to obtain a fourth motion vector. The second prediction device 4 is configured to perform motion compensation prediction according to the fourth motion vector obtained by the second scaling device 3 during the decoding process. deal with. The second scaling device 3 may include a first transform module 10, a scaling module 20, and a second transform module 30 that are sequentially connected. The first transform module 10 is configured to perform coordinate transformation on the first motion vector according to a coordinate offset between the bottom field image and the top field image to obtain a second motion vector; the scaling module 20 The second motion vector is used to perform the third motion vector, and the second motion vector is used to perform inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector.

In the above embodiment of the decoding system of the present invention, the first transform module and the second transform module in the second scaling device respectively perform half-pixel on the motion vector before and after the scaling according to the offset of the top field image and the bottom field image in the spatial position. After the compensation, the scaling process is performed by the scaling module, and finally the motion prediction prediction process in the decoding process is performed by the second prediction device according to the fourth motion vector, which can ensure the accuracy of the motion vector scaling and improve the motion vector prediction accuracy. Thereby, the coding compression efficiency of the field image is improved, and the decoding efficiency is further improved.

In the above embodiment of the present invention, the fact that the top field image and the bottom field image have a positional deviation in the vertical direction affects the encoding efficiency. In the video coding framework, in addition to the above considerations in the motion compensation prediction process, other factors such as interpolation and loop filtering should also be considered. By improving interpolation and loop filtering, the accuracy is improved, and the coding compression efficiency is improved.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware or by means of software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be written as a computer executable program, and the computer device can implement the method provided by the present invention by executing the program. The computer executable can be stored in a non-volatile storage medium (including CD-ROM, USB flash drive, mobile hard disk, etc.).

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A scaling method for a motion vector, comprising:

And scaling the second motion vector to obtain a third motion vector;

The scaling method of a motion vector according to claim 1, characterized in that the unit of the coordinate offset amount is the same as the unit of the motion vector.

3. The method of scaling a motion vector according to claim 2, wherein if the field image is not interpolated, the coordinate offset is 0.5 and the unit is a pixel.

The method for scaling a motion vector according to claim 2, wherein if the field image is subjected to 1/n interpolation processing, the coordinate offset is 0.5 χη, and the unit is 1/η pixel, wherein, 1/ η is an interpolation coefficient.

The method for scaling a motion vector according to claim 1, 2, 3 or 4, wherein the performing coordinate transformation on the first motion vector comprises: performing coordinate transformation on a vertical component of the first motion vector.

The method for scaling a motion vector according to claim 5, wherein the performing coordinate transformation on the vertical component of the first motion vector comprises:

And if the first motion vector is directed from the top field to the bottom field, adding a vertical component of the first motion vector to the coordinate offset;

If the first motion vector is directed from the bottom field to the top field, the vertical component of the first motion vector is subtracted from the coordinate offset;

If the first motion vector is directed from the top field to the top field or from the bottom field to the bottom field, the vertical component of the first motion vector is not transformed.

The method for scaling a motion vector according to claim 1, 2, 3 or 4, wherein the scaling the second motion vector comprises: following the rigid body uniform linear motion model to the second motion The vector is linearly scaled.

8. The method of scaling a motion vector according to claim 7, wherein said step is just The linear scaling of the second motion vector by the uniform motion linear motion model specifically includes: following the second body motion according to a direction of the second motion vector or a direction parallel to the second motion vector according to the rigid body uniform linear motion model The vector is linearly scaled.

9. The method of scaling a motion vector according to claim 8, wherein the linearly scaled scaling factor is dependent on a length of the first motion vector and the fourth motion vector projection on a time axis, if the When a motion vector is different from a direction of the fourth motion vector, the scaling factor is a negative number.

The method for scaling a motion vector according to claim 1, 2, 3 or 4, wherein the inverse inverse transformation of the third motion vector comprises: a vertical component of the third motion vector Perform inverse coordinate transformation.

The method for scaling a motion vector according to claim 10, wherein the inversely transforming the vertical component of the third motion vector comprises:

If the third motion vector is directed from the top field to the bottom field, the vertical component of the third motion vector is subtracted from the coordinate offset;

And if the third motion vector is directed from the bottom field to the top field, adding a vertical component of the third motion vector to the coordinate offset;

If the third motion vector is directed from the top field to the top field or from the bottom field to the bottom field, the vertical component of the third motion vector is not transformed.

12. A motion vector scaling apparatus, comprising:

13. The motion vector scaling apparatus according to claim 12, wherein the first transform module comprises:

a first identifying unit, configured to identify a direction of the first motion vector;

a first transforming unit, configured to perform coordinate transformation on a vertical component of the first motion vector according to the recognition result of the first identifying unit and the coordinate offset to obtain a second motion vector.

14. The motion vector scaling apparatus according to claim 12, wherein the second transform module comprises:

a second identifying unit, configured to identify a direction of the third motion vector;

And a second transforming unit, configured to coordinate-convert the vertical component of the third motion vector according to the recognition result of the second identifying unit and the coordinate offset to obtain a fourth motion vector.

15. An encoding method, comprising:

The fourth motion vector is used for motion compensation prediction processing.

16. A decoding method, comprising:

In the decoding process, when performing motion vector prediction processing, the step of scaling the motion vector includes: performing coordinate transformation on the first motion vector according to a coordinate offset between the bottom field image and the top field image to obtain a second motion vector And scaling the second motion vector to obtain a third motion vector; performing inverse coordinate transformation on the third motion vector according to the coordinate offset to obtain a fourth motion vector;

The fourth motion vector is used for motion compensation prediction processing.

17. An encoding system, comprising:

The first scaling device includes:

18. A decoding system, comprising:

The second scaling device includes: