CN110636288B

CN110636288B - Video decoding and encoding method and device and electronic equipment

Info

Publication number: CN110636288B
Application number: CN201910927096.9A
Authority: CN
Inventors: 高欣玮
Original assignee: Tencent Technology Shenzhen Co Ltd
Current assignee: Tencent Technology Shenzhen Co Ltd
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2023-11-14
Anticipated expiration: 2039-09-27
Also published as: CN110636288A

Abstract

The invention discloses a video decoding and encoding method and device and electronic equipment. Wherein the method comprises the following steps: obtaining coding parameters of a decoded video frame before the video frame to be decoded and coding parameters of one or more reference blocks in the decoded video frame, wherein the positions of the reference blocks in the decoded video frame are the same as the positions of the blocks to be decoded in the video frame to be decoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector; determining a target resolution for decoding the block to be decoded according to the coding parameters of the decoded video frame and the coding parameters of the reference block; and decoding the block to be decoded by adopting the target resolution. The invention solves the technical problem of poor flexibility in encoding and decoding video frames in the related art.

Description

Video decoding and encoding method and device and electronic equipment

Technical Field

The present invention relates to the field of computers, and in particular, to a video decoding and encoding method and apparatus, and an electronic device.

Background

In the existing video encoding process, the same resolution is generally used for encoding and decoding each frame in the video. As shown in fig. 1, if high resolution is used for encoding and decoding each frame in the video, in the case where the bandwidth bits of transmission is relatively small (e.g., smaller than the bandwidth threshold intersection point D shown in fig. 1), the peak signal-to-noise ratio PSNR corresponding to encoding and decoding with high resolution is lower than the peak signal-to-noise ratio PSNR corresponding to encoding and decoding with low resolution, that is, the peak signal-to-noise ratio PSNR corresponding to encoding and decoding with high resolution is relatively small and the distortion is relatively large when the transmission bandwidth is small.

If the low resolution is used for encoding and decoding each frame in the video, in the case where the bandwidth bits of the transmission is relatively large (e.g., greater than the bandwidth threshold crossing point D shown in fig. 1), the peak signal-to-noise ratio PSNR corresponding to the encoding and decoding with the low resolution is lower than the peak signal-to-noise ratio PSNR corresponding to the encoding and decoding with the high resolution, that is, the peak signal-to-noise ratio PSNR corresponding to the encoding and decoding with the low resolution is relatively small and the distortion is relatively large when the transmission bandwidth is large.

In view of the above problems, no effective solution has been proposed at present.

Disclosure of Invention

The embodiment of the invention provides a video decoding and encoding method and device and electronic equipment, which at least solve the technical problem of poor flexibility in encoding and decoding video frames in the related technology.

According to an aspect of an embodiment of the present invention, there is provided a video decoding method including: acquiring coding parameters of a decoded video frame before a video frame to be decoded and coding parameters of one or more reference blocks in the decoded video frame, wherein the positions of the reference blocks in the decoded video frame are the same as the positions of the blocks to be decoded in the video frame to be decoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector; determining a target resolution for decoding the block to be decoded according to the encoding parameters of the decoded video frame and the encoding parameters of the reference block; and decoding the block to be decoded by adopting the target resolution.

According to an aspect of the embodiment of the present invention, there is also provided a video encoding method, including: acquiring coding parameters of an encoded video frame preceding a video frame to be encoded and coding parameters of one or more reference blocks in the encoded video frame, wherein the positions of the reference blocks in the encoded video frame are the same as the positions of the blocks to be encoded in the video frame to be encoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector; determining a target resolution for encoding the block to be encoded according to the encoding parameters of the encoded video frame and the encoding parameters of the reference block; and encoding the block to be encoded by adopting the target resolution.

According to an aspect of an embodiment of the present invention, there is also provided a video decoding apparatus including: a first obtaining unit, configured to obtain an encoding parameter of a decoded video frame preceding a video frame to be decoded and an encoding parameter of one or more reference blocks in the decoded video frame, where a position of the reference block in the decoded video frame is the same as a position of a block to be decoded in the video frame to be decoded, and the encoding parameter includes at least one of: directional prediction mode, quantization parameter, length of motion vector; a determining unit, configured to determine a target resolution for decoding the block to be decoded according to the encoding parameter of the decoded video frame and the encoding parameter of the reference block; and the decoding unit is used for decoding the block to be decoded by adopting the target resolution.

As an alternative example, the above-described determination unit includes: the first calculation module is used for carrying out weighted summation on the directional prediction mode of the decoded video frame and the directional prediction mode of the reference block to obtain a total directional prediction mode; a first determining module, configured to determine, if the total directional prediction mode is greater than a first predetermined threshold, that the target resolution is a first resolution; a second determining module, configured to determine the target resolution as a second resolution if the total directional prediction mode is less than or equal to a first predetermined threshold and greater than a second predetermined threshold, where the first resolution is less than the second resolution and the second predetermined threshold is less than the first predetermined threshold; and a third determining module, configured to determine the target resolution as a third resolution when the total directional prediction mode is less than or equal to a second predetermined threshold and greater than a third predetermined threshold, where the second resolution is less than the third resolution, and the third predetermined threshold is less than the second predetermined threshold.

As an alternative example, the above-described determination unit includes: the second calculation module is used for carrying out weighted summation on the quantization parameter of the decoded video frame and the quantization parameter of the reference block to obtain a total quantization parameter; a fourth determining module, configured to determine, when the total quantization parameter is greater than a fourth predetermined threshold, that the target resolution is the first resolution; a fifth determining module, configured to determine the target resolution as the second resolution if the total quantization parameter is less than or equal to a fourth predetermined threshold and greater than a fifth predetermined threshold, where the first resolution is less than the second resolution and the fifth predetermined threshold is less than the fourth predetermined threshold; and a sixth determining module, configured to determine the target resolution as the third resolution when the total quantization parameter is less than or equal to a fifth predetermined threshold and greater than a sixth predetermined threshold, where the second resolution is less than the third resolution and the sixth predetermined threshold is less than the fifth predetermined threshold.

As an alternative example, the above-described determination unit includes: a third calculation module, configured to perform weighted summation on the length of the motion vector of the decoded video frame and the length of the motion vector of the reference block, to obtain the length of the total motion vector; a seventh determining module, configured to determine the target resolution as the first resolution if the length of the total motion vector is greater than a seventh predetermined threshold; an eighth determining module, configured to determine the target resolution as the second resolution when the length of the total motion vector is less than or equal to a seventh predetermined threshold and greater than the eighth predetermined threshold, where the first resolution is less than the second resolution, and the eighth predetermined threshold is less than the seventh predetermined threshold; and a ninth determining module, configured to determine the target resolution as a third resolution when the length of the total motion vector is less than or equal to an eighth predetermined threshold and greater than the ninth predetermined threshold, where the second resolution is less than the third resolution, and the ninth predetermined threshold is less than the eighth predetermined threshold.

As an alternative example, the above-described acquisition unit includes: a first obtaining module, configured to obtain, when the reference block covers a plurality of decoded blocks in the decoded video frame, encoding parameters of each of the covered plurality of decoded blocks; and the fourth calculation module is used for taking the ratio of the area of each decoded block covered in the reference block to the total area of the reference block as a weight, and carrying out weighted summation calculation on the coding parameters of each decoded block to obtain the coding parameters of the reference block.

As an alternative example, the above decoding unit includes: the second obtaining module is used for obtaining the flag bit carried in the block to be decoded under the condition that the number of the reference blocks is different, wherein the flag bit is used for indicating the number relation between the block to be decoded and the reference blocks.

According to an aspect of an embodiment of the present invention, there is also provided a video encoding apparatus including: an obtaining unit, configured to obtain an encoding parameter of an encoded video frame preceding a video frame to be encoded and an encoding parameter of one or more reference blocks in the encoded video frame, where a position of the reference block in the encoded video frame is the same as a position of a block to be encoded in the video frame to be encoded, and the encoding parameter includes at least one of: directional prediction mode, quantization parameter, length of motion vector; a determining unit, configured to determine a target resolution for encoding the block to be encoded according to the encoding parameter of the encoded video frame and the encoding parameter of the reference block; and the encoding unit is used for encoding the block to be encoded by adopting the target resolution.

As an alternative example, the above-described determination unit includes: the first calculation module is used for carrying out weighted summation on the directional prediction mode of the coded video frame and the directional prediction mode of the reference block to obtain a total directional prediction mode; a first determining module, configured to determine, if the total directional prediction mode is greater than a first predetermined threshold, that the target resolution is a first resolution; a second determining module, configured to determine the target resolution as a second resolution if the total directional prediction mode is less than or equal to a first predetermined threshold and greater than a second predetermined threshold, where the first resolution is less than the second resolution and the second predetermined threshold is less than the first predetermined threshold; and a third determining module, configured to determine the target resolution as a third resolution when the total directional prediction mode is less than or equal to a second predetermined threshold and greater than a third predetermined threshold, where the second resolution is less than the third resolution, and the third predetermined threshold is less than the second predetermined threshold.

As an alternative example, the above-described determination unit includes: the second calculation module is used for carrying out weighted summation on the quantization parameter of the coded video frame and the quantization parameter of the reference block to obtain a total quantization parameter; a fourth determining module, configured to determine, when the total quantization parameter is greater than a fourth predetermined threshold, that the target resolution is the first resolution; a fifth determining module, configured to determine the target resolution as the second resolution if the total quantization parameter is less than or equal to a fourth predetermined threshold and greater than a fifth predetermined threshold, where the first resolution is less than the second resolution and the fifth predetermined threshold is less than the fourth predetermined threshold; and a sixth determining module, configured to determine the target resolution as the third resolution when the total quantization parameter is less than or equal to a fifth predetermined threshold and greater than a sixth predetermined threshold, where the second resolution is less than the third resolution and the sixth predetermined threshold is less than the fifth predetermined threshold.

As an alternative example, the above-described determination unit includes: a third calculation module, configured to perform weighted summation on the length of the motion vector of the encoded video frame and the length of the motion vector of the reference block, to obtain the length of the total motion vector; a seventh determining module, configured to determine the target resolution as the first resolution if the length of the total motion vector is greater than a seventh predetermined threshold; an eighth determining module, configured to determine the target resolution as the second resolution when the length of the total motion vector is less than or equal to a seventh predetermined threshold and greater than the eighth predetermined threshold, where the first resolution is less than the second resolution, and the eighth predetermined threshold is less than the seventh predetermined threshold; and a ninth determining module, configured to determine the target resolution as a third resolution when the length of the total motion vector is less than or equal to an eighth predetermined threshold and greater than the ninth predetermined threshold, where the second resolution is less than the third resolution, and the ninth predetermined threshold is less than the eighth predetermined threshold.

As an alternative example, the above-described acquisition unit includes: an acquisition module, configured to acquire, in a case where a reference block covers a plurality of encoded blocks in an encoded video frame, encoding parameters of each of the covered plurality of encoded blocks; and the fourth calculation module is used for taking the ratio of the area of each coded block covered in the reference block to the total area of the reference block as a weight, and carrying out weighted summation calculation on the coding parameters of each coded block to obtain the coding parameters of the reference block.

As an alternative example, the above-described encoding unit includes: the setting module is used for setting a flag bit in encoded data obtained by encoding the block to be encoded under the condition that the number of the reference blocks is different, wherein the flag bit is used for indicating the number relation between the block to be encoded and the reference blocks.

According to an aspect of an embodiment of the present invention, there is also provided a computer-readable storage medium having stored therein a computer program, wherein the computer program is configured to perform the above-described video decoding method when run.

According to an aspect of the embodiment of the present invention, there is also provided an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the video decoding method or the video encoding method through the computer program.

In the embodiment of the application, a method for decoding a block to be decoded by acquiring coding parameters of a decoded video frame before the video frame to be decoded and coding parameters of a reference block in the decoded video frame is adopted, and determining a target resolution for decoding the block to be decoded according to the coding parameters of the decoded video frame and the coding parameters of the reference block and adopting the target resolution. In the method, when the block to be decoded is decoded, the decoded reference block and the decoded video frame can be used for determining the target resolution used in decoding the block to be decoded, so that the target resolutions of different blocks to be decoded in decoding can be different, the effect of encoding and decoding different blocks in the video frame by adopting different target resolutions is realized, the flexibility of encoding and decoding the video frame is improved, and the technical problem of poor flexibility of encoding and decoding the video frame in the related technology is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

FIG. 1 is a schematic illustration of one prior art according to the prior art;

fig. 2 is a schematic diagram of an application scenario of an alternative video decoding method according to an embodiment of the present invention;

fig. 3 is a schematic view of an application scenario of another alternative video decoding method according to an embodiment of the present invention

FIG. 4 is a flow chart of an alternative video decoding method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an alternative video decoding method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an alternative video encoding method according to an embodiment of the invention;

FIG. 7 is a schematic diagram of another alternative video decoding method according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of another alternative video encoding method according to an embodiment of the present invention;

FIG. 9 is a flow chart of an alternative video encoding method according to an embodiment of the invention;

fig. 10 is a schematic structural view of an alternative visual decoding apparatus according to an embodiment of the present invention;

fig. 11 is a schematic structural view of an alternative video encoding apparatus according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a structure of another alternative video encoding apparatus according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of an alternative electronic device in accordance with an embodiment of the invention;

FIG. 14 is a schematic diagram of an alternative electronic device in accordance with an embodiment of the invention;

FIG. 15 is a schematic structural view of yet another alternative electronic device in accordance with an embodiment of the present invention;

fig. 16 is a schematic structural view of yet another alternative electronic device according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

According to an aspect of the embodiment of the present application, there is provided a video decoding method, optionally, as an alternative implementation, the video decoding method may be applied, but not limited to, in the environment shown in fig. 2.

Fig. 2 is a simplified block diagram of a communication system (200) according to an embodiment of the present disclosure. The communication system (200) includes a plurality of terminal devices that can communicate with each other through, for example, a network (250). For example, the communication system (200) comprises a first terminal device (210) and a second terminal device (220) interconnected by a network (250). In the embodiment of fig. 2, the first terminal device (210) and the second terminal device (220) perform unidirectional data transmission. For example, the first end device (210) may encode video data (e.g., a stream of video pictures collected by the end device (210)) for transmission to the second end device (220) over the network (250). The encoded video data is transmitted in one or more encoded video code streams. The second terminal device (220) may receive the encoded video data from the network (250), decode the encoded video data to recover the video data, and display the video pictures according to the recovered video data. Unidirectional data transmission is common in applications such as media services.

In another embodiment, the communication system (200) includes a third terminal device (230) and a fourth terminal device (240) that perform bi-directional transmission of encoded video data, which bi-directional transmission may occur, for example, during a video conference. For bi-directional data transmission, each of the third terminal device (230) and the fourth terminal device (240) may encode video data (e.g., a video picture stream collected by the terminal device) for transmission over the network (250) to the other of the third terminal device (230) and the fourth terminal device (240). Each of the third terminal device (230) and the fourth terminal device (240) may also receive encoded video data transmitted by the other of the third terminal device (230) and the fourth terminal device (240), and may decode the encoded video data to recover the video data, and may display a video picture on an accessible display device according to the recovered video data.

In the embodiment of fig. 2, the first terminal device (210), the second terminal device (220), the third terminal device (230), and the fourth terminal device (240) may be servers, personal computers, and smart phones, but the principles of the present disclosure may not be limited thereto. The disclosed embodiments are applicable to laptop computers, tablet computers, media players, and/or dedicated video conferencing devices. The network (250) represents any number of networks that transfer encoded video data between the first terminal device (210), the second terminal device (220), the third terminal device (230), and the fourth terminal device (240), including, for example, wired (connecting) and/or wireless communication networks. The communication network (250) may exchange data in circuit-switched and/or packet-switched channels. The network may include a telecommunications network, a local area network, a wide area network, and/or the internet. For the purposes of the present application, the architecture and topology of the network (250) may be irrelevant to the operation of the present disclosure unless explained below.

As an example, fig. 3 shows the placement of a video encoder and video decoder in a streaming environment. The presently disclosed subject matter is equally applicable to other video-enabled applications including, for example, video conferencing, digital TV, storing compressed video on digital media including CDs, DVDs, memory sticks, etc.

The streaming system may include an acquisition subsystem (313), which may include a video source (301) such as a digital camera, which creates an uncompressed video picture stream (302). In an embodiment, the video picture stream (302) includes samples taken by a digital camera. The video picture stream (302) is depicted as a bold line compared to the encoded video data (304) (or encoded video code stream) to emphasize a high data volume video picture stream, the video picture stream (302) being processable by an electronic device (320), the electronic device (320) comprising a video encoder (303) coupled to a video source (301). The video encoder (303) may include hardware, software, or a combination of hardware and software to implement or implement aspects of the disclosed subject matter as described in more detail below. The encoded video data (304) (or encoded video stream (304)) is depicted as a thin line compared to the video picture stream (302) to emphasize lower data amounts of the encoded video data (304) (or encoded video stream (304)), which may be stored on a streaming server (305) for future use. One or more streaming client sub-systems, such as client sub-system (306) and client sub-system (308) in fig. 3, may access streaming server (305) to retrieve copies (307) and copies (309) of encoded video data (304). The client subsystem (306) may include, for example, a video decoder (310) in an electronic device (330). A video decoder (310) decodes an incoming copy (307) of the encoded video data and generates an output video picture stream (311) that can be presented on a display (312) (e.g., a display screen) or another presentation device (not depicted). In some streaming systems, encoded video data (304), video data (307), and video data (309) (e.g., a video bitstream) may be encoded according to some video encoding/compression standards. Examples of such standards include ITU-T H.265. In an embodiment, the video coding standard being developed is informally referred to as next generation video coding (Versatile Video Coding, VVC), and the present application may be used in the context of the VVC standard.

It should be noted that the electronic device (320) and the electronic device (330) may include other components (not shown). For example, the electronic device (320) may include a video decoder (not shown), and the electronic device (330) may also include a video encoder (not shown).

Optionally, as an optional embodiment, as shown in fig. 4, the video decoding method includes:

s402, acquiring coding parameters of a decoded video frame before the video frame to be decoded and coding parameters of one or more reference blocks in the decoded video frame, wherein the positions of the reference blocks in the decoded video frame are the same as the positions of the blocks to be decoded in the video frame to be decoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector;

s404, determining a target resolution for decoding the block to be decoded according to the coding parameters of the decoded video frame and the coding parameters of the reference block;

and S406, decoding the block to be decoded by adopting the target resolution.

Alternatively, the video decoding method described above may be applied, but not limited to, in the process of encoding and decoding video frames.

For example, in encoding and decoding a video frame, at the time of encoding, for an encoded video frame preceding one video frame and a reference block in the encoded video frame, encoding parameters of the encoded video frame and the reference block in the encoded video frame are used to determine a target resolution at which a block to be encoded is encoded, and the block to be encoded is encoded using the target resolution. When decoding, the same method is used for determining a decoded video frame of a block to be decoded and a reference block in the decoded video frame, the encoding parameters of the decoded video frame and the reference block in the decoded video frame are used for determining the target resolution for decoding the block to be decoded, and the target resolution is used for decoding the block to be decoded, so that in the encoding or decoding process, different blocks in one video frame can be encoded or decoded by using different target resolutions according to the encoded/decoded video frame and the reference block in the encoded/decoded video frame, and the effect of improving the flexibility of encoding or decoding the video frame is realized.

Alternatively, the target resolution in the present solution may be a resolution commonly referred to as a contract. For example, the target resolution may be 1920×1080 resolution, etc. available. Or, for a resolution agreed upon by the relevant standard.

Alternatively, the coding parameters in the present scheme may include, but are not limited to, directional Mode (DM), quantization parameter (quantization parameter QP), motion Vector (MV), and Motion Vector (length of Motion Vector) that represents the relative displacement between the current coding block and the best matching block in its reference picture.

Alternatively, the present scheme is explained from encoding to decoding. The video frame to be encoded in the present scheme may be preceded by one or more encoded video frames. For the case where a video frame to be encoded is preceded by a plurality of frames of encoded video frames. The multi-frame coded video frames all comprise reference blocks, namely the blocks to be coded in the video frames to be coded comprise a plurality of corresponding reference blocks.

Alternatively, the encoded video frames may be contiguous video frames or non-contiguous video frames. For example, for a 10-frame video, where the 8 th frame is a video frame to be encoded, when encoding a block to be encoded in the video frame to be encoded, the block to be encoded may be encoded according to the encoding parameters of the 1 st frame, the 3 rd frame, and the 5 th frame and the encoding parameters of the reference block in the frame.

Alternatively, the video frame to be encoded and the encoded video frame in the present scheme may be split into a plurality of blocks. Each block to be encoded in the video frame to be encoded may correspond to a reference block in the encoded video frame. The reference block may coincide with one encoded block in the encoded video frame or the reference block may cover a portion of a plurality of blocks in the encoded video frame. For example, as shown in fig. 5, fig. 5 is a case where a reference block of a block to be encoded in a video frame to be encoded covers a part of a plurality of encoded blocks in an encoded video frame. The reference block 504 of the block to be encoded 502 covers a plurality of encoded blocks 506.

Or, alternatively, the reference block of the video frame to be encoded/decoded may also coincide with one of the encoded/decoded blocks in the encoded/decoded video frame.

After determining the encoded video frame and the encoded block for determining the target resolution at the time of encoding of the block to be encoded, it is necessary to acquire encoding parameters of reference blocks in the encoded video frame and the encoded block.

Optionally, the coding parameters in the present scheme include at least one of: directional prediction mode, quantization parameters, length of motion vector.

Alternatively, the above coding parameters may be used alone or in combination.

For example, for the case of single use, the directional prediction mode of a reference block in an encoded video frame is obtained. Alternatively, the directional prediction Mode in this scheme may be a Direction Mode (DM) or an intra-frame prediction Mode. The directional prediction mode is a series of numbers in the video coding standard. Each direction mode corresponds to a numerical value one by one. For a reference block, one or more pixels may be included. And acquiring a directional prediction mode of each pixel point. For example, if the directional prediction mode of one pixel is 1 and one reference block includes one pixel, the directional prediction mode of the pixel is determined as the directional prediction mode of the reference block. In the case where the reference block has a plurality of pixels, the variance of the directional prediction mode of the plurality of pixels is calculated. For example, in a reference block including four pixels, the directional prediction modes of the four pixels are 1, 3, 4, and 8, respectively, variances of 1, 3, 4, and 8 are calculated, and the calculated variances are used as the directional prediction modes of the reference block.

After the directional prediction mode of the reference block is obtained, the directional prediction mode of each of the other blocks in the encoded video frame may also be obtained. And then carrying out weighted summation on the directional prediction modes of each block to obtain the directional prediction mode of the coded video frame. The directional prediction mode of the reference block may be further weighted and summed with the directional prediction mode of the encoded block to obtain a total directional prediction mode. And determining the target resolution for encoding the block to be encoded according to the total directional prediction mode.

Alternatively, if there are a plurality of encoded video frames, the total directional prediction mode of each encoded video frame may be obtained, and then the weighted summation is performed, and the weighted summation result is taken as the total directional prediction mode.

Optionally, in a case where the total directional prediction mode is greater than a first predetermined threshold, determining the target resolution as the first resolution; determining the target resolution as a second resolution in the case that the total directivity prediction mode is less than or equal to a first predetermined threshold and greater than a second predetermined threshold, wherein the first resolution is less than the second resolution and the second predetermined threshold is less than the first predetermined threshold; and determining the target resolution as a third resolution in the case that the total directivity prediction mode is smaller than or equal to a second predetermined threshold and larger than a third predetermined threshold, wherein the second resolution is smaller than the third resolution, and the third predetermined threshold is smaller than the second predetermined threshold.

For the case of single use, the quantization parameters of the reference block are obtained, then the quantization parameters of each block other than the reference block are obtained, and the quantization parameters of each block including the reference block are weighted and summed to obtain the quantization parameters of the encoded video frame. The quantization parameter of the reference block is weighted and summed with the quantization parameter of the encoded video frame to obtain a total quantization parameter. And determining the target resolution for encoding the block to be encoded according to the total quantization parameter. If the encoded video frames include a plurality of encoded video frames, the total quantization parameter of each encoded video frame may be weighted and summed to obtain a new total quantization parameter, and the target resolution may be determined using the new total quantization parameter.

Optionally, determining the target resolution as the first resolution in case the total quantization parameter is greater than a fourth predetermined threshold; determining the target resolution as the second resolution in the case that the total quantization parameter is less than or equal to a fourth predetermined threshold and greater than a fifth predetermined threshold, wherein the first resolution is less than the second resolution and the fifth predetermined threshold is less than the fourth predetermined threshold; and determining the target resolution as the third resolution in the case that the total quantization parameter is smaller than or equal to a fifth predetermined threshold value and larger than a sixth predetermined threshold value, wherein the second resolution is smaller than the third resolution, and the sixth predetermined threshold value is smaller than the fifth predetermined threshold value.

For the case of single use, the length of the motion vector of the reference block is obtained, then the length of the motion vector of each block other than the reference block is obtained, and the lengths of the motion vectors of each block including the reference block are weighted and summed to obtain the length of the motion vector of the encoded video frame. The length of the motion vector of the reference block is weighted and summed with the length of the motion vector of the encoded video frame to obtain the length of the total motion vector. And determining the target resolution for encoding the block to be encoded according to the length of the total motion vector. If the encoded video frames include a plurality of encoded video frames, the length of the total motion vector for each encoded video frame may be weighted and summed to obtain a new length of the total motion vector, which is used to determine the target resolution.

Optionally, in a case where the length of the total motion vector is greater than a seventh predetermined threshold, determining the target resolution as the first resolution; determining the target resolution as the second resolution in the case that the length of the total motion vector is less than or equal to a seventh predetermined threshold and greater than an eighth predetermined threshold, wherein the first resolution is less than the second resolution and the eighth predetermined threshold is less than the seventh predetermined threshold; and determining the target resolution as a third resolution in the case that the length of the total motion vector is smaller than or equal to an eighth predetermined threshold value and larger than a ninth predetermined threshold value, wherein the second resolution is smaller than the third resolution, and the ninth predetermined threshold value is smaller than the eighth predetermined threshold value.

For the mixed use of the coding parameters, the obtained total coding parameters can be weighted and summed to obtain a final reference value, and the target resolution is determined according to the final reference value.

For example, if the coding parameters include a directional prediction mode and a quantization parameter, the total directional prediction mode and the total quantization parameter of the coded video frame can be obtained by the above method, and then the total directional prediction mode and the total quantization parameter are weighted and summed to obtain the final reference value.

Optionally, in a case where the reference value is greater than a tenth predetermined threshold, determining the target resolution as the first resolution; determining the target resolution as the second resolution in the case that the reference value is less than or equal to a tenth predetermined threshold value and greater than an eleventh predetermined threshold value, wherein the first resolution is less than the second resolution and the eleventh predetermined threshold value is less than the tenth predetermined threshold value; and determining the target resolution as the third resolution in the case that the reference value is less than or equal to an eleventh predetermined threshold value and greater than a twelfth predetermined threshold value, wherein the twelfth predetermined threshold value is less than the eleventh predetermined threshold value and the second resolution is less than the third resolution value.

Optionally, after determining the target resolution, the target resolution may be used to encode the block to be encoded in the video frame to be encoded. For each block to be encoded in a video frame to be encoded, a target resolution for encoding needs to be determined.

Optionally, in this solution, after all the blocks to be encoded in the video frame are encoded, an encoded video frame is obtained, and the resolutions of the blocks of the video frame may be the same or different. And sending the encoded video frames or videos formed by all the encoded video frames to a decoding side, and decoding by the decoding side.

The video frame to be decoded in this scheme may be preceded by one or more decoded video frames. For the case where a video frame to be decoded is preceded by a multi-frame decoded video frame. The multi-frame decoded video frames each comprise a reference block, i.e. the block to be decoded in the video frame to be decoded comprises a plurality of corresponding reference blocks.

Alternatively, the decoded video frames may be contiguous video frames or non-contiguous video frames. For example, for a 10-frame video, where the 8 th frame is a video frame to be decoded, when decoding a block to be decoded in the video frame to be decoded, the block to be decoded may be decoded according to the coding parameters of the 1 st frame, the 3 rd frame, and the 5 th frame and the coding parameters of the reference block in the frame.

Alternatively, the video frame to be decoded and the decoded video frame in the present scheme may be split into a plurality of blocks. Each block to be decoded in the video frame to be decoded may correspond to a reference block in the decoded video frame. The reference block may coincide with a decoded block in the decoded video frame or the reference block may cover a portion of a plurality of blocks in the decoded video frame. For example, as shown in fig. 6, fig. 6 is a case where a reference block of a block to be decoded in a video frame to be decoded covers a part of a plurality of blocks in a decoded video frame. The reference block 604 of the block to be decoded 602 covers a plurality of decoded blocks 606.

After determining the decoded video frames and the decoded blocks for determining the target resolution at the time of decoding of the blocks to be decoded, the encoding parameters of the decoded video frames and the decoded blocks need to be acquired.

Alternatively, the above coding parameters may be used alone or in combination.

For example, for the case of single use, the directional prediction mode of the reference block in the decoded video frame is obtained. After the directional prediction mode of the reference block is acquired, the directional prediction mode of each of the other blocks in the decoded video frame may also be acquired. And then carrying out weighted summation on the directional prediction modes of each block to obtain the directional prediction mode of the decoded video frame. The directional prediction mode of the reference block may be further weighted and summed with the directional prediction mode of the decoded block to obtain a total directional prediction mode. And determining the target resolution for decoding the block to be decoded according to the total directivity prediction mode.

Alternatively, if there are a plurality of decoded video frames, the total directional prediction mode of each decoded video frame may be acquired, and then the weighted summation is performed, and the weighted summation result is taken as the total directional prediction mode.

For the case of single use, the quantization parameters of the reference block are obtained, then the quantization parameters of each block other than the reference block are obtained, and the quantization parameters of each block including the reference block are weighted and summed to obtain the quantization parameters of the decoded video frame. The quantization parameter of the reference block is weighted and summed with the quantization parameter of the decoded video frame to obtain a total quantization parameter. And determining the target resolution for decoding the block to be decoded according to the total quantization parameter. If the decoded video frames include a plurality of frames, the total quantization parameter of each decoded video frame may be weighted and summed to obtain a new total quantization parameter, and the target resolution may be determined using the new total quantization parameter.

For the case of single use, the length of the motion vector of the reference block is obtained, then the length of the motion vector of each block other than the reference block is obtained, and the lengths of the motion vectors of each block including the reference block are weighted and summed to obtain the length of the motion vector of the decoded video frame. The length of the motion vector of the reference block is weighted and summed with the length of the motion vector of the decoded video frame to obtain the length of the total motion vector. And determining the target resolution for decoding the block to be decoded according to the length of the total motion vector. If the decoded video frames contain a plurality of frames, the length of the total motion vector of each decoded video frame may be weighted and summed to obtain a new length of the total motion vector, and the target resolution may be determined using the new length of the total motion vector.

For example, if the coding parameters include a directional prediction mode and a quantization parameter, the total directional prediction mode and the total quantization parameter of the decoded video frame can be obtained by the above method, and then the total directional prediction mode and the total quantization parameter are weighted and summed to obtain the final reference value.

Optionally, after determining the target resolution, the target resolution may be used to decode the block to be decoded in the video frame to be decoded. For each block to be decoded in a video frame to be decoded, a target resolution for decoding needs to be determined.

Optionally, in the process of decoding the video frame to be decoded in this scheme, multiple blocks to be decoded in the video frame to be decoded may have different decoding resolutions. In this process, the edge filtering process may also be performed on pixels in adjacent two blocks to be decoded of different resolutions. For example, at least one to-be-decoded block is determined among a plurality of to-be-decoded blocks, and each to-be-decoded block at least comprises two to-be-decoded blocks with different resolutions. The two blocks to be decoded of different resolutions are adjacent. At this time, it is necessary to perform edge filtering processing on two blocks to be decoded. Before processing, the resolution of the two blocks to be decoded needs to be adjusted to the same resolution. Such as adjusting the resolution of the first block to be decoded to the resolution of the second block to be decoded (in the case where a group of blocks to be decoded includes two blocks to be decoded), or adjusting the resolution of the second block to be decoded to the resolution of the first block to be decoded, or adjusting the resolution of two blocks to be decoded to another resolution different from the resolution of both blocks to be decoded. After the adjustment, an edge filtering operation may be performed. When the edge filtering operation is executed, a first edge pixel point set is determined from a first block to be decoded, a second edge pixel point set is determined from a second block to be decoded, and the positions of the first edge pixel point set and the second edge pixel point set are adjacent, namely, the pixels in the first edge pixel point set and the second edge pixel point set are two adjacent pixels of the block to be decoded. When the filtering processing is executed, filtering processing is carried out on the first edge pixel point set to obtain a filtered first edge pixel point set, filtering processing is carried out on the second edge pixel point set to obtain a filtered second edge pixel point set, wherein a first difference value between a pixel value of an ith pixel point in the filtered first edge pixel point set and a pixel value of a jth pixel point corresponding to the ith pixel point in the filtered second edge pixel point set is smaller than a second difference value between the pixel value of the ith pixel point in the first edge pixel point set and the pixel value of the jth pixel point in the second edge pixel point set before filtering, i is a positive integer and is smaller than or equal to the total number of the pixel points in the first edge pixel point set, j is a positive integer and is smaller than or equal to the total number of the pixel points in the second edge pixel point set. The filtering processing aims to avoid obvious joints in the video in the reconstruction process, thereby ensuring that the content in the video is accurately restored, and further solving the technical problem of video distortion caused by inconsistent resolution.

Alternatively, in the present scheme, during the process of encoding and decoding the video frame, the video frame may be split into the same or different blocks.

Alternatively, the encoding side and the decoding side may agree in advance on a splitting method of the video frame. Such as splitting into 4 blocks on average, etc. For the first block to be encoded/decoded, since there is no reference block, the encoding/decoding strategy may be agreed in advance to ensure that the video frame decoded by the decoding side is the same as the video frame before encoding by the encoding side.

Optionally, in this scheme, different splitting methods may be set for the video frame to be encoded and the video frame to be decoded, and split into different target blocks. Alternatively, in the case where the splitting method is the same, different numbers of encoded/decoded video frames and reference blocks may be used for the blocks to be encoded/decoded at the same position in the video frames to be encoded and decoded. In this case, at the time of encoding, the number of encoded video frames and reference blocks used for the block to be encoded needs to be transmitted to the decoding side so that the decoding side decodes according to the number. For example, when encoding, a flag bit is carried in the encoded data, the flag bit indicates the number relation between the block to be encoded and the encoded video frame and the reference block, and when decoding, decoding can be performed according to the number relation carried in the flag bit.

Alternatively, a specific example is described. For example, one video frame to be encoded is preceded by 1 encoded video frame. As shown in fig. 7, when the block 702 to be encoded in fig. 7 is encoded, the encoded block 706 in the encoded video frame 704 may be determined as a reference block, and the encoding parameters of the reference block may be determined. When the coding parameters of the reference block are determined, the coding parameters of each pixel point in one reference block are obtained, the variance of the coding parameters of each pixel point is calculated, the variance is determined as the coding parameters of the reference block, and the coding parameters of the reference block and the coding parameters of the coded video frame are weighted and summed to obtain the total coding parameters. E.g. 8, and the first and second and third predetermined thresholds, e.g. 12, 7, 1, the coding parameters of the block to be coded are between the first and second predetermined thresholds. The block 702 to be encoded is encoded using the second resolution. After the coding resolutions of all the blocks to be coded in the video frame to be coded are determined, each block to be coded is coded by using the corresponding resolution. And transmits the encoded video frames to the decoding side. After receiving the video frame to be decoded, the decoding side may split the video frame to be decoded according to a manner agreed with the encoding side and decode the block to be decoded using a decoding manner agreed with the encoding side, as shown in fig. 8, the decoding side may determine a target resolution of the block to be decoded 802 using the reference block 806 and the encoding parameters of the decoded video frame 804 according to the same manner as the encoding side and decode the block to be decoded using the target resolution, thereby obtaining a decoding result.

According to the embodiment, the method for decoding the block to be decoded by adopting the target resolution is determined by adopting the coding parameters of the decoded video frame before the video frame to be decoded and the coding parameters of the reference block in the decoded video frame according to the coding parameters of the decoded video frame and the coding parameters of the reference block. In the method, when the block to be decoded is decoded, the decoded reference block and the decoded video frame can be used for determining the target resolution used in the process of decoding the block to be decoded, so that the target resolutions of different blocks to be decoded in the process of decoding can be different, the effect of encoding and decoding different blocks in the video frame by adopting different target resolutions is realized, and the flexibility of encoding and decoding the video frame is improved.

As an alternative embodiment, determining a target resolution for decoding a block to be decoded from the encoding parameters of the decoded video frame and the encoding parameters of the reference block, comprises:

s1, carrying out weighted summation on a directional prediction mode of a decoded video frame and a directional prediction mode of a reference block to obtain a total directional prediction mode;

S2, determining the target resolution as the first resolution under the condition that the total directivity prediction mode is larger than a first preset threshold value;

s3, determining the target resolution as a second resolution when the total directivity prediction mode is smaller than or equal to a first preset threshold value and larger than a second preset threshold value, wherein the first resolution is smaller than the second resolution, and the second preset threshold value is smaller than the first preset threshold value;

and S4, determining the target resolution as a third resolution when the total directivity prediction mode is smaller than or equal to a second preset threshold value and larger than a third preset threshold value, wherein the second resolution is smaller than the third resolution, and the third preset threshold value is smaller than the second preset threshold value.

According to the embodiment, the target resolution for decoding the block to be decoded is determined by the method, so that the decoding flexibility of decoding the video frame is improved.

s1, carrying out weighted summation on quantization parameters of a decoded video frame and quantization parameters of a reference block to obtain total quantization parameters;

S2, determining the target resolution as the first resolution under the condition that the total quantization parameter is larger than a fourth preset threshold value;

s3, determining the target resolution as the second resolution when the total quantization parameter is smaller than or equal to a fourth preset threshold value and larger than a fifth preset threshold value, wherein the first resolution is smaller than the second resolution, and the fifth preset threshold value is smaller than the fourth preset threshold value;

and S4, determining the target resolution as the third resolution when the total quantization parameter is smaller than or equal to a fifth preset threshold value and larger than a sixth preset threshold value, wherein the second resolution is smaller than the third resolution, and the sixth preset threshold value is smaller than the fifth preset threshold value.

s1, carrying out weighted summation on the length of the motion vector of the decoded video frame and the length of the motion vector of the reference block to obtain the length of the total motion vector;

S2, determining the target resolution as the first resolution in the case that the length of the total motion vector is larger than a seventh preset threshold value;

s3, determining the target resolution as the second resolution when the length of the total motion vector is smaller than or equal to a seventh preset threshold value and larger than an eighth preset threshold value, wherein the first resolution is smaller than the second resolution, and the eighth preset threshold value is smaller than the seventh preset threshold value;

and S4, determining the target resolution as a third resolution in the case that the length of the total motion vector is smaller than or equal to an eighth preset threshold value and larger than a ninth preset threshold value, wherein the second resolution is smaller than the third resolution, and the ninth preset threshold value is smaller than the eighth preset threshold value.

As an alternative embodiment, obtaining coding parameters of a reference block in a decoded video frame preceding the video frame to be decoded comprises:

s1, under the condition that a reference block covers a plurality of decoded blocks in a decoded video frame, acquiring coding parameters of each decoded block in the covered plurality of decoded blocks;

S2, taking the ratio of the area of each decoded block covered in the reference block to the total area of the reference block as a weight, and carrying out weighted summation calculation on the coding parameters of each decoded block to obtain the coding parameters of the reference block.

According to the embodiment, the coding parameters of the reference block are determined through the method, so that the accuracy of determining the coding parameters of the reference block is improved.

As an alternative embodiment, for different blocks to be decoded, the number of reference blocks corresponding to the blocks to be decoded is the same or different, where in the case that the number of reference blocks is different, decoding the blocks to be decoded with the target resolution further includes:

s1, obtaining a flag bit carried in a block to be decoded, wherein the flag bit is used for indicating the number relation between the block to be decoded and a reference block.

According to the embodiment, the number relation between the block to be decoded and the reference block is obtained by using the method of the flag bit, so that the consistency of the encoding and decoding processes is ensured.

It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.

According to an aspect of the embodiment of the present invention, there is also provided a video encoding method. Optionally, as shown in fig. 9, the video encoding method includes:

s902, acquiring coding parameters of an encoded video frame preceding the video frame to be encoded and coding parameters of one or more reference blocks in the encoded video frame, where the positions of the reference blocks in the encoded video frame are the same as the positions of the blocks to be encoded in the video frame to be encoded, and the coding parameters include at least one of the following: directional prediction mode, quantization parameter, length of motion vector;

s904, determining a target resolution for encoding the block to be encoded according to the encoding parameters of the encoded video frame and the encoding parameters of the reference block;

s906, encoding the block to be encoded with the target resolution.

Alternatively, the video encoding method can be applied to, but not limited to, a process of encoding and decoding video frames.

For example, in encoding and decoding a video frame, at the time of encoding, for an encoded video frame preceding one video frame and a reference block in the encoded video frame, encoding parameters of the encoded video frame and the reference block in the encoded video frame are used to determine a target resolution at which a block to be encoded is encoded, and the block to be encoded is encoded using the target resolution. When decoding, the same method is used for determining a decoded video frame of a block to be decoded and a reference block in the decoded video frame, the encoding parameters of the decoded video frame and the reference block in the decoded video frame are used for determining the target resolution for decoding the block to be decoded, and the target resolution is used for decoding the block to be decoded, so that in the encoding or decoding process, different blocks to be encoded/decoded in one video frame can be encoded or decoded by using different target resolutions according to the encoded/decoded video frame and the reference block in the encoded/decoded video frame, and the effect of improving the flexibility of encoding or decoding the video frame is realized.

Optionally, for a specific encoding example in this embodiment, please refer to various cases in the foregoing embodiments, and this embodiment is not described herein.

As an alternative embodiment, determining a target resolution for encoding a block to be encoded based on the encoding parameters of the encoded video frame and the encoding parameters of the reference block, comprises:

s1, carrying out weighted summation on a directional prediction mode of an encoded video frame and a directional prediction mode of a reference block to obtain a total directional prediction mode;

According to the embodiment, the target resolution for encoding the block to be encoded is determined by the method, so that the encoding flexibility of encoding the video frame is improved.

s1, carrying out weighted summation on quantization parameters of an encoded video frame and quantization parameters of a reference block to obtain total quantization parameters;

s1, carrying out weighted summation on the length of the motion vector of the coded video frame and the length of the motion vector of the reference block to obtain the length of the total motion vector;

As an alternative embodiment, obtaining coding parameters of a reference block in an encoded video frame preceding the video frame to be encoded comprises:

s1, under the condition that a reference block covers a plurality of encoded blocks in an encoded video frame, acquiring encoding parameters of each encoded block in the covered plurality of encoded blocks;

s2, taking the ratio of the area of each coded block covered in the reference block to the total area of the reference block as a weight, and carrying out weighted summation calculation on the coding parameters of each coded block to obtain the coding parameters of the reference block.

As an alternative embodiment, for different blocks to be encoded, the number of reference blocks corresponding to the blocks to be encoded is the same or different, where, in the case that the number of reference blocks is different, encoding the blocks to be encoded with the target resolution further includes:

s1, setting a zone bit in encoded data obtained by encoding a block to be encoded, wherein the zone bit is used for indicating the quantity relation between the block to be encoded and a reference block.

According to the embodiment, the number relation between the block to be encoded and the reference block is transferred by using the method of the flag bit, so that the consistency of the encoding and decoding processes is ensured.

According to an aspect of the embodiments of the present invention, there is also provided a video decoding apparatus for implementing the video decoding method described above. As shown in fig. 10, the apparatus includes:

(1) An obtaining unit 1002, configured to obtain an encoding parameter of a decoded video frame preceding a video frame to be decoded and an encoding parameter of one or more reference blocks in the decoded video frame, where a position of a reference block in the decoded video frame is the same as a position of a block to be decoded in the video frame to be decoded, and the encoding parameter includes at least one of: directional prediction mode, quantization parameter, length of motion vector;

(2) A determining unit 1004, configured to determine a target resolution for decoding the block to be decoded according to the encoding parameter of the decoded video frame and the encoding parameter of the reference block;

(3) A decoding unit 1006, configured to decode the block to be decoded using the target resolution.

Alternatively, the video decoding device can be applied to the process of encoding and decoding video frames, but is not limited to the process.

For example, in encoding and decoding a video frame, at the time of encoding, for an encoded video frame preceding one video frame and a reference block in the encoded video frame, encoding parameters of the encoded video frame and the reference block in the encoded video frame are used to determine a target resolution at which a block to be encoded is encoded, and the block to be encoded is encoded using the target resolution. When decoding, the same method is used for determining an encoded video frame of a block to be decoded and a reference block in the encoded video frame, encoding parameters of the encoded video frame and the reference block in the encoded video frame are used for determining target resolution for decoding the block to be decoded, and the target resolution is used for decoding the block to be decoded, so that in the encoding or decoding process, different blocks in one video frame can be encoded or decoded by using different target resolutions according to the encoded video frame and the reference block in the encoded video frame, and the effect of improving the flexibility of encoding or decoding the video frame is realized.

As an alternative embodiment, the determining unit includes:

(1) The first calculation module is used for carrying out weighted summation on the directional prediction mode of the decoded video frame and the directional prediction mode of the reference block to obtain a total directional prediction mode;

(2) A first determining module, configured to determine, if the total directional prediction mode is greater than a first predetermined threshold, that the target resolution is a first resolution;

(3) A second determining module, configured to determine the target resolution as a second resolution if the total directional prediction mode is less than or equal to a first predetermined threshold and greater than a second predetermined threshold, where the first resolution is less than the second resolution and the second predetermined threshold is less than the first predetermined threshold;

(4) And a third determining module, configured to determine the target resolution as a third resolution when the total directional prediction mode is less than or equal to a second predetermined threshold and greater than a third predetermined threshold, where the second resolution is less than the third resolution, and the third predetermined threshold is less than the second predetermined threshold.

As an alternative embodiment, the determining unit comprises:

(1) The second calculation module is used for carrying out weighted summation on the quantization parameter of the decoded video frame and the quantization parameter of the reference block to obtain a total quantization parameter;

(2) A fourth determining module, configured to determine, when the total quantization parameter is greater than a fourth predetermined threshold, that the target resolution is the first resolution;

(3) A fifth determining module, configured to determine the target resolution as the second resolution if the total quantization parameter is less than or equal to a fourth predetermined threshold and greater than a fifth predetermined threshold, where the first resolution is less than the second resolution and the fifth predetermined threshold is less than the fourth predetermined threshold;

(4) And a sixth determining module, configured to determine the target resolution as the third resolution when the total quantization parameter is less than or equal to a fifth predetermined threshold and greater than a sixth predetermined threshold, where the second resolution is less than the third resolution and the sixth predetermined threshold is less than the fifth predetermined threshold.

As an alternative embodiment, the determining unit comprises:

(1) A third calculation module, configured to perform weighted summation on the length of the motion vector of the decoded video frame and the length of the motion vector of the reference block, to obtain the length of the total motion vector;

(2) A seventh determining module, configured to determine the target resolution as the first resolution if the length of the total motion vector is greater than a seventh predetermined threshold;

(3) An eighth determining module, configured to determine the target resolution as the second resolution when the length of the total motion vector is less than or equal to a seventh predetermined threshold and greater than the eighth predetermined threshold, where the first resolution is less than the second resolution, and the eighth predetermined threshold is less than the seventh predetermined threshold;

(4) And a ninth determining module, configured to determine the target resolution as a third resolution when the length of the total motion vector is less than or equal to an eighth predetermined threshold and greater than the ninth predetermined threshold, where the second resolution is less than the third resolution, and the ninth predetermined threshold is less than the eighth predetermined threshold.

As an alternative embodiment, the acquisition unit comprises:

(1) A first obtaining module, configured to obtain, when the reference block covers a plurality of decoded blocks in the decoded video frame, encoding parameters of each of the covered plurality of decoded blocks;

(2) And the fourth calculation module is used for taking the ratio of the area of each decoded block covered in the reference block to the total area of the reference block as a weight, and carrying out weighted summation calculation on the coding parameters of each decoded block to obtain the coding parameters of the reference block.

As an alternative embodiment, the number of reference blocks corresponding to the blocks to be decoded is the same or different, and the decoding unit includes:

(1) The second obtaining module is used for obtaining the flag bit carried in the block to be decoded under the condition that the number of the reference blocks is different, wherein the flag bit is used for indicating the number relation between the block to be decoded and the reference blocks.

According to an aspect of the embodiment of the present invention, there is also provided a video encoding apparatus for implementing the video encoding method described above. As shown in fig. 11, the apparatus includes:

(1) An obtaining unit 1102, configured to obtain an encoding parameter of an encoded video frame preceding the video frame to be encoded and an encoding parameter of one or more reference blocks in the encoded video frame, where a position of the reference block in the encoded video frame is the same as a position of the block to be encoded in the video frame to be encoded, and the encoding parameter includes at least one of: directional prediction mode, quantization parameter, length of motion vector;

(2) A determining unit 1104 for determining a target resolution for encoding the block to be encoded according to the encoding parameters of the encoded video frame and the encoding parameters of the reference block;

(3) An encoding unit 1106, configured to encode the block to be encoded with the target resolution.

Alternatively, the video encoding device may be applied, but not limited to, in the process of encoding and decoding video frames.

As an alternative embodiment, the determining unit comprises:

(1) The first calculation module is used for carrying out weighted summation on the directional prediction mode of the coded video frame and the directional prediction mode of the reference block to obtain a total directional prediction mode;

As an alternative embodiment, the determining unit comprises:

(1) The second calculation module is used for carrying out weighted summation on the quantization parameter of the coded video frame and the quantization parameter of the reference block to obtain a total quantization parameter;

As an alternative embodiment, the determining unit comprises:

(1) A third calculation module, configured to perform weighted summation on the length of the motion vector of the encoded video frame and the length of the motion vector of the reference block, to obtain the length of the total motion vector;

As an alternative embodiment, as shown in fig. 12, the acquisition unit includes:

(1) An obtaining module 1202, configured to obtain, in a case where the reference block covers a plurality of encoded blocks in the encoded video frame, encoding parameters of each of the covered plurality of encoded blocks;

(2) And a fourth calculation module 1204, configured to take a ratio of an area of each of the encoded blocks covered in the reference block to a total area of the reference block as a weight, and perform weighted summation calculation on the encoding parameters of each of the encoded blocks to obtain the encoding parameters of the reference block.

As an alternative embodiment, for different blocks to be encoded, the number of reference blocks corresponding to the blocks to be encoded is the same or different, and the encoding unit includes:

(1) The setting module is used for setting a flag bit in encoded data obtained by encoding the block to be encoded under the condition that the number of the reference blocks is different, wherein the flag bit is used for indicating the number relation between the block to be encoded and the reference blocks.

According to a further aspect of embodiments of the present invention, there is also provided an electronic device for implementing the above-described video decoding method, optionally, the electronic device in this aspect may include a memory and a processor, the memory may store a computer program, and the processor is configured to execute the steps in any of the decoding method embodiments described above by means of the computer program.

Alternatively, in this embodiment, the electronic device may be located in at least one network device of a plurality of network devices of the computer network.

Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program:

s1, acquiring coding parameters of a decoded video frame before a video frame to be decoded and coding parameters of one or more reference blocks in the decoded video frame, wherein the positions of the reference blocks in the decoded video frame are the same as the positions of the blocks to be decoded in the video frame to be decoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector;

s2, determining a target resolution for decoding the block to be decoded according to the coding parameters of the decoded video frame and the coding parameters of the reference block;

And S3, decoding the block to be decoded by adopting the target resolution.

Alternatively, as an alternative embodiment, as shown in fig. 13, the electronic apparatus in this embodiment may be an electronic device (1330). The electronic device 1330 may include a receiver (1331) (e.g., a receive circuit). A receiver (1331) may receive one or more encoded video sequences to be decoded by a video decoder (1310); in the same or another embodiment, one encoded video sequence is received at a time, wherein the decoding of each encoded video sequence is independent of the other encoded video sequences. The encoded video sequence may be received from a channel (1301), which may be a hardware/software link to a storage device storing the encoded video data. The receiver (1331) may receive encoded video data as well as other data, e.g., encoded audio data and/or auxiliary data streams, which may be forwarded to their respective use entities (not shown). The receiver (1331) may separate the encoded video sequence from other data. To prevent network jitter, a buffer memory (1315) may be coupled between the receiver (1331) and the entropy decoder/parser (1320) (hereinafter "parser (1320)"). In some applications, the buffer memory (1315) is part of the video decoder (1310). In other cases, the buffer memory 1315 may be disposed external (not shown) to the video decoder 1310. In other cases, a buffer memory (not shown) is provided external to the video decoder (1310), for example, to prevent network jitter, and another buffer memory (1315) may be configured internal to the video decoder (1310), for example, to handle playout timing. The buffer memory (1315) may not be required or may be made smaller when the receiver (1331) receives data from a store/forward device with sufficient bandwidth and controllability or from an isochronous network. Of course, for use over a traffic packet network such as the internet, a buffer memory (1315) may also be required, which may be relatively large and may be of adaptive size, and may be implemented at least in part in a similar element (not labeled) external to the operating system or video decoder (1310).

The video decoder (1310) may include a parser (1320) to reconstruct the symbols (1321) from the encoded video sequence. The categories of these symbols include information for managing the operation of the video decoder (1310), as well as potential information to control a display device such as the display device (1312) (e.g., a display screen) that is not an integral part of the electronic device (1330), but that may be coupled to the electronic device (1330), as shown in fig. 13. The control information for the display device may be auxiliary enhancement information (Supplemental Enhancement Information, SEI message) or a parameter set fragment (not labeled) of video availability information (Video Usability Information, VUI). A parser (1320) may parse/entropy decode the received encoded video sequence. The encoding of the encoded video sequence may be in accordance with video encoding techniques or standards, and may follow various principles, including variable length encoding, huffman coding (Huffman coding), arithmetic coding with or without context sensitivity, and so forth. The parser (1320) may extract a sub-group parameter set for at least one of the sub-groups of pixels in the video decoder from the encoded video sequence based on the at least one parameter corresponding to the group. A subgroup may include a group of pictures (Group of Pictures, GOP), pictures, tiles, slices, macroblocks, coding Units (CUs), blocks, transform Units (TUs), prediction Units (PUs), and so forth. The parser (1320) may also extract information, such as transform coefficients, quantizer parameter values, motion vectors, etc., from the encoded video sequence.

The parser (1320) may perform entropy decoding/parsing operations on the video sequence received from the buffer memory (1315), thereby creating symbols (1321).

Depending on the type of encoded video picture or a portion of encoded video picture (e.g., inter and intra pictures, inter and intra blocks), and other factors, the reconstruction of the symbol (1321) may involve a number of different units. Which units are involved and how are controlled by subgroup control information that a parser (1320) parses from the encoded video sequence. For brevity, such sub-group control information flow between the parser (1320) and the units below is not described.

In addition to the functional blocks already mentioned, the video decoder (1310) may be conceptually subdivided into several functional units as described below. In practical embodiments operating under commercial constraints, many of these units interact tightly with each other and may be integrated with each other. However, for the purpose of describing the disclosed subject matter, it is conceptually subdivided into the following functional units.

The first unit is a scaler/inverse transform unit (1351). The sealer/inverse transform unit (1351) receives the quantized transform coefficients as symbols (1321) from the parser (1320) along with control information including which transform mode, block size, quantization factor, quantization scaling matrix, etc. is used. The sealer/inverse transform unit (1351) may output a block comprising sample values, which may be input into the aggregator (1355).

In some cases, the output samples of the sealer/inverse transform unit (1351) may belong to an intra-coded block; namely: the predictive information from the previously reconstructed picture is not used, but a block of predictive information from the previously reconstructed portion of the current picture may be used. Such predictive information may be provided by the intra picture prediction unit (1352). In some cases, the intra picture prediction unit (1352) uses the reconstructed information extracted from the current picture buffer (1358) to generate surrounding blocks of the same size and shape as the block being reconstructed. For example, the current picture buffer (1358) buffers partially reconstructed current pictures and/or fully reconstructed current pictures. In some cases, the aggregator (1355) adds, on a per sample basis, prediction information generated by the intra-prediction unit (1352) to the output sample information provided by the sealer/inverse transform unit (1351).

In other cases, the output samples of the scaler/inverse transform unit (1351) may belong to inter-coding and potential motion compensation blocks. In this case, the motion compensated prediction unit (1353) may access the reference picture memory (1357) to extract samples for prediction. After motion compensation of the extracted samples according to the symbol (1321), these samples may be added by an aggregator (1355) to the output of the sealer/inverse transform unit (1351), in this case referred to as residual samples or residual signals, to generate output sample information. The retrieval of the prediction samples by the motion compensated prediction unit (1353) from an address within the reference picture memory (1357) may be controlled by a motion vector, and the motion vector is used by the motion compensated prediction unit (1353) in the form of a symbol (1321), the symbol (1321) for example comprising X, Y and a reference picture component. The motion compensation may also include interpolation of sample values extracted from the reference picture store (1357), motion vector prediction mechanisms, and so forth when sub-sample accurate motion vectors are used.

The output samples of the aggregator (1355) may be employed by various loop filtering techniques in a loop filter unit (1356). Video compression techniques may include in-loop filter techniques that are controlled by parameters included in an encoded video sequence (also referred to as an encoded video stream), and the parameters are available to a loop filter unit (1356) as symbols (1321) from a parser (1320). However, in other embodiments, the video compression techniques may also be responsive to meta information obtained during decoding of a previous (in decoding order) portion of an encoded picture or encoded video sequence, as well as to previously reconstructed and loop filtered sample values.

The output of the loop filter unit (1356) may be a sample stream, which may be output to the display device (1312) and stored in the reference picture memory (1357) for use in subsequent inter picture prediction.

Once fully reconstructed, some encoded pictures may be used as reference pictures for future prediction. For example, once an encoded picture corresponding to a current picture is fully reconstructed and the encoded picture is identified (by, for example, a parser (1320)) as a reference picture, the current picture buffer (1358) may become part of the reference picture memory (1357) and a new current picture buffer may be reallocated before starting to reconstruct a subsequent encoded picture.

The video decoder (1310) may perform decoding operations according to a predetermined video compression technique, for example, in the ITU-T h.265 standard. The coded video sequence may conform to the syntax specified by the video compression technique or standard used in the sense that the coded video sequence follows the syntax of the video compression technique or standard and the configuration files recorded in the video compression technique or standard. In particular, the configuration file may select some tools from all tools available in the video compression technology or standard as the only tools available under the configuration file. For compliance, the complexity of the encoded video sequence is also required to be within the limits defined by the hierarchy of video compression techniques or standards. In some cases, the hierarchy limits a maximum picture size, a maximum frame rate, a maximum reconstructed sample rate (measured in units of, for example, mega samples per second), a maximum reference picture size, and so on. In some cases, the limits set by the hierarchy may be further defined by hypothetical reference decoder (Hypothetical Reference Decoder, HRD) specifications and metadata managed by an HRD buffer signaled in the encoded video sequence.

In an embodiment, the receiver (1331) may receive additional (redundant) data along with the encoded video. The additional data may be part of the encoded video sequence. The additional data may be used by the video decoder (1310) to properly decode the data and/or more accurately reconstruct the original video data. The additional data may be in the form of, for example, a temporal, spatial, or signal-to-noise ratio (signal noise ratio, SNR) enhancement layer, redundant slices, redundant pictures, forward error correction codes, and the like.

Or, as another alternative embodiment, a video decoder is used to receive encoded pictures that are part of an encoded video sequence and decode the encoded pictures to generate reconstructed pictures. As shown in fig. 14, the video decoder (1410) includes an entropy decoder (1471), an inter-frame decoder (1480), a residual decoder (1473), a reconstruction module (1474), and an intra-frame decoder (1472) coupled together as shown in fig. 14.

An entropy decoder (1471) may be used to reconstruct certain symbols from the encoded pictures, the symbols representing syntax elements that make up the encoded pictures. Such symbols may include, for example, modes used to encode the block (e.g., intra mode, inter mode, bi-predictive mode, a merge sub-mode of the latter two, or another sub-mode), prediction information (e.g., intra prediction information or inter prediction information) that may identify certain samples or metadata used by an intra decoder (1472) or an inter decoder (1480), respectively, to predict, residual information in the form of, for example, quantized transform coefficients, and the like. In an embodiment, when the prediction mode is an inter or bi-directional prediction mode, providing inter prediction information to an inter decoder (1480); and providing the intra prediction information to an intra decoder (1472) when the prediction type is an intra prediction type. The residual information may be quantized via inverse quantization and provided to a residual decoder (1473).

An inter decoder (1480) is configured to receive inter prediction information and generate inter prediction results based on the inter prediction information.

An intra decoder (1472) is configured to receive intra prediction information and generate a prediction result based on the intra prediction information.

A residual decoder (1473) is used to perform inverse quantization to extract dequantized transform coefficients, and to process the dequantized transform coefficients to transform the residual from the frequency domain to the spatial domain. The residual decoder (1473) may also need some control information (to obtain the quantizer parameter QP), and the information may be provided by the entropy decoder (1471) (data path not labeled, since this is only a low amount of control information).

A reconstruction module (1474) is used to combine the residual output by the residual decoder (1473) with the prediction result (which may be output by the inter prediction module or the intra prediction module) in the spatial domain to form a reconstructed block, which may be part of a reconstructed picture, which in turn may be part of a reconstructed video. It should be noted that other suitable operations, such as deblocking operations, may be performed to improve visual quality.

According to still another aspect of the embodiment of the present invention, there is also provided an electronic device for implementing the video encoding method described above. Optionally, the electronic device may comprise a memory and a processor, the memory having stored therein a computer program arranged to perform the steps of any of the above described encoding method embodiments by means of the computer program.

s1, acquiring coding parameters of an encoded video frame before a video frame to be encoded and coding parameters of one or more reference blocks in the encoded video frame, wherein the positions of the reference blocks in the encoded video frame are the same as the positions of the blocks to be encoded in the video frame to be encoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector;

s2, determining a target resolution for encoding the block to be encoded according to the encoding parameters of the encoded video frame and the encoding parameters of the reference block;

s3, coding the block to be coded by adopting the target resolution.

Alternatively, as an alternative example, as shown in fig. 15, the electronic apparatus may be an electronic device (1520). The electronic device (1520) includes a transmitter (1540) (e.g., a transmission circuit).

A video encoder (1503) in the electronic device 1520 may receive video samples from a video source (1501) (not part of the electronic device (1520) in the embodiment of fig. 15), which may acquire video images to be encoded by the video encoder (1503). In another embodiment, the video source (1501) is part of an electronic device (1520).

The video source (1501) may provide a source video sequence in the form of a stream of digital video samples to be encoded by the video encoder (1503), which may have any suitable bit depth (e.g., 8 bits, 10 bits, 12 bits … …), any color space (e.g., bt.601Y CrCB, RGB … …), and any suitable sampling structure (e.g., Y CrCB 4:2:0, Y CrCB 4: 4). In a media service system, the video source (1501) may be a storage device storing video that has been previously prepared. In a video conferencing system, the video source (1501) may be a camera that collects local image information as a video sequence. Video data may be provided as a plurality of individual pictures that are given motion when viewed in sequence. The picture itself may be implemented as a spatial pixel array, where each pixel may include one or more samples, depending on the sampling structure, color space, etc. used. The relationship between pixels and samples can be readily understood by those skilled in the art. The following focuses on describing the sample.

According to an embodiment, the video encoder (1503) may encode and compress pictures of the source video sequence into an encoded video sequence (1543) in real-time or under any other temporal constraint required by the application. Performing the proper encoding speed is a function of the controller (1550). In some embodiments, a controller (1550) controls and is functionally coupled to other functional units as described below. For simplicity, coupling is not shown. The parameters set by the controller (1550) may include rate control related parameters (picture skip, quantizer, lambda value for rate distortion optimization techniques, etc.), picture size, picture group (group of pictures, GOP) layout, maximum motion vector search range, etc. The controller (1550) may be used to have other suitable functions related to the video encoder (1503) optimized for a certain system design.

In some embodiments, the video encoder (1503) operates in a coding loop. As a simple description, in an embodiment, the encoding loop may include a source encoder (1530) (e.g., responsible for creating symbols, such as a symbol stream, based on the input picture and reference picture to be encoded) and a (local) decoder (1533) embedded in the video encoder (1503). The decoder (1533) reconstructs the symbols to create sample data in a manner similar to the way the (remote) decoder creates sample data (since any compression between the symbols and the encoded video stream is lossless in the video compression technique contemplated by the present application). The reconstructed sample stream (sample data) is input to a reference picture memory (1534). Since decoding of the symbol stream produces a bit-accurate result independent of the decoder location (local or remote), the content in the reference picture memory (1534) also corresponds bit-accurately between the local encoder and the remote encoder. In other words, the reference picture samples "seen" by the prediction portion of the encoder are exactly the same as the sample values "seen" when the decoder would use prediction during decoding. This reference picture synchronicity rationale (and drift that occurs in the event that synchronicity cannot be maintained due to channel errors, for example) is also used in some related art.

The operation of the "local" decoder (1533) may be the same as the "remote" decoder, e.g., the video decoder that has been described in detail above in connection with fig. 13 and 14.

During operation, in some embodiments, the source encoder (1530) may perform motion compensated predictive encoding. Motion compensated predictive coding predictively codes an input picture with reference to one or more previously coded pictures from a video sequence designated as "reference pictures". In this way, the encoding engine (1532) encodes differences between pixel blocks of the input picture and pixel blocks of the reference picture, which may be selected as a prediction reference for the input picture.

The local video decoder (1533) may decode encoded video data of a picture that may be designated as a reference picture based on the symbol created by the source encoder (1530). The operation of the encoding engine (1532) may be a lossy process. When encoded video data may be decoded at a video decoder (not shown in fig. 15), the reconstructed video sequence may typically be a copy of the source video sequence with some errors. The local video decoder (1533) replicates the decoding process, which may be performed on the reference picture by the video decoder, and may cause the reconstructed reference picture to be stored in the reference picture cache (1534). In this way, the video encoder (1503) may locally store a copy of the reconstructed reference picture that has common content (no transmission errors) with the reconstructed reference picture to be obtained by the remote video decoder.

The predictor (1535) may perform a prediction search for the encoding engine (1532). That is, for a new picture to be encoded, the predictor (1535) may search the reference picture memory (1534) for sample data (as candidate reference pixel blocks) or some metadata, such as reference picture motion vectors, block shapes, etc., that may be suitable prediction references for the new picture. The predictor (1535) may operate pixel-by-pixel block based on the block of samples to find a suitable prediction reference. In some cases, from search results obtained by the predictor (1535), it may be determined that the input picture may have prediction references taken from a plurality of reference pictures stored in the reference picture memory (1534).

The controller (1550) may manage the encoding operations of the source encoder (1530) including, for example, setting parameters and subgroup parameters for encoding the video data.

The outputs of all of the above functional units may be entropy encoded in an entropy encoder (1545). The entropy encoder 1545 losslessly compresses the symbols generated by the various functional units according to techniques such as huffman coding, variable length coding, arithmetic coding, etc., thereby converting the symbols into an encoded video sequence.

The transmitter (1540) may buffer the encoded video sequence created by the entropy encoder (1545) in preparation for transmission over a communication channel (1560), which may be a hardware/software link to a storage device that is to store encoded video data. The transmitter (1540) may combine the encoded video data from the video encoder (1503) with other data to be transmitted, such as encoded audio data and/or an auxiliary data stream (source not shown).

The controller (1550) may manage the operation of the video encoder (1503). During encoding, the controller (1550) may assign each encoded picture a certain encoded picture type, but this may affect the encoding techniques applicable to the respective picture. For example, a picture may generally be assigned to any one of the following picture types:

an intra picture (I picture), which may be a picture that can be encoded and decoded without using any other picture in the sequence as a prediction source. Some video codecs allow for different types of intra pictures, including, for example, independent decoder refresh (Independent Decoder Refresh, "IDR") pictures. Variations of the I picture and its corresponding applications and features are known to those skilled in the art.

A predictive picture (P-picture), which may be a picture that may be encoded and decoded using intra-or inter-prediction that predicts sample values for each block using at most one motion vector and a reference index.

Bi-predictive pictures (B-pictures), which may be pictures that can be encoded and decoded using intra-or inter-prediction that predicts sample values for each block using at most two motion vectors and a reference index. Similarly, multiple predictive pictures may use more than two reference pictures and associated metadata for reconstructing a single block.

A source picture may typically be spatially subdivided into blocks of samples (e.g., blocks of 4 x 4, 8 x 8, 4 x 8, or 16 x 16 samples), and encoded block by block. These blocks may be predictive coded with reference to other (coded) blocks, which are determined from the coding allocation applied to the respective pictures of the blocks. For example, a block of an I picture may be non-predictive encoded, or a block may be predictive encoded (spatial prediction or intra prediction) with reference to an already encoded block of the same picture. The pixel blocks of the P picture may be prediction encoded by spatial prediction or by temporal prediction with reference to a previously encoded reference picture. A block of B pictures may be prediction encoded by spatial prediction or by temporal prediction with reference to one or two previously encoded reference pictures.

Video encoder (1503) may perform encoding operations according to predetermined video encoding techniques or standards, such as ITU-T h.265 recommendation. In operation, the video encoder (1503) may perform various compression operations, including predictive coding operations that exploit temporal and spatial redundancies in the input video sequence. Thus, the encoded video data may conform to the syntax specified by the video encoding technique or standard used.

In an embodiment, the transmitter (1540) may transmit the additional data when transmitting the encoded video. The source encoder 1530 may take such data as part of an encoded video sequence. The additional data may include temporal/spatial/SNR enhancement layers, redundant pictures and slices, other forms of redundant data, SEI messages, VUI parameter set slices, and the like.

The acquired video may be used as a plurality of source pictures (video pictures) in a time series. Intra picture prediction (often abbreviated as intra prediction) exploits spatial correlation in a given picture, while inter picture prediction exploits (temporal or other) correlation between pictures. In an embodiment, a specific picture being encoded/decoded is divided into blocks, and the specific picture being encoded/decoded is referred to as a current picture. When a block in the current picture is similar to a reference block in a reference picture that has been previously encoded and still buffered in video, the block in the current picture may be encoded by a vector called a motion vector. The motion vector points to a reference block in the reference picture, and in the case of using multiple reference pictures, the motion vector may have a third dimension that identifies the reference picture.

In some embodiments, bi-prediction techniques may be used in inter-picture prediction. According to bi-prediction techniques, two reference pictures are used, e.g., a first reference picture and a second reference picture, both preceding a current picture in video in decoding order (but possibly in display order in the past and future, respectively). The block in the current picture may be encoded by a first motion vector pointing to a first reference block in a first reference picture and a second motion vector pointing to a second reference block in a second reference picture. In particular, a block may be predicted by a combination of a first reference block and a second reference block.

Furthermore, merge mode techniques may be used in inter picture prediction to improve coding efficiency.

According to some embodiments of the present disclosure, prediction such as inter-picture prediction and intra-picture prediction is performed in units of blocks. For example, according to the HEVC standard, pictures in a sequence of video pictures are partitioned into Coding Tree Units (CTUs) for compression, with CTUs in the pictures having the same size, such as 64 x 64 pixels, 32 x 32 pixels, or 16 x 16 pixels. In general, a CTU includes three coding tree blocks (coding tree block, CTB), which are one luma CTB and two chroma CTBs. Still further, each CTU may be split into one or more Coding Units (CUs) in a quadtree. For example, a 64×64 pixel CTU may be split into one 64×64 pixel CU, or 4 32×32 pixel CUs, or 16 16×16 pixel CUs. In an embodiment, each CU is analyzed to determine a prediction type for the CU, such as an inter prediction type or an intra prediction type. Furthermore, depending on temporal and/or spatial predictability, a CU is split into one or more Prediction Units (PUs). In general, each PU includes a luminance Prediction Block (PB) and two chrominance PB. In an embodiment, a prediction operation in encoding (encoding/decoding) is performed in units of prediction blocks. Taking a luminance prediction block as an example of a prediction block, the prediction block includes a matrix of pixel values (e.g., luminance values), such as 8×8 pixels, 16×16 pixels, 8×16 pixels, 16×8 pixels, and so on.

Or, as an alternative implementation, the video encoder is configured to receive a processing block (e.g., a prediction block) of sample values within a current video picture in a sequence of video pictures, and encode the processing block into an encoded picture that is part of the encoded video sequence. For example, as shown in fig. 16, in an HEVC embodiment, a video encoder (1603) receives a matrix of sample values for processing blocks, such as prediction blocks of 8 x 8 samples, and so on. The video encoder (1603) uses, for example, rate-distortion (RD) optimization to determine whether to encode the processing block using intra-mode, inter-mode, or bi-predictive mode. When encoding a processing block in intra mode, a video encoder (1603) may use intra prediction techniques to encode the processing block into an encoded picture; and when encoding the processing block in inter mode or bi-predictive mode, the video encoder (1603) may encode the processing block into the encoded picture using inter prediction or bi-predictive techniques, respectively. In some video coding techniques, the merge mode may be an inter picture predictor mode in which motion vectors are derived from one or more motion vector predictors without resorting to coded motion vector components outside of the predictors. In some other video coding techniques, there may be motion vector components that are applicable to the subject block. In an embodiment, the video encoder (1603) includes other components, such as a mode decision module (not shown) for determining a processing block mode.

In the embodiment of fig. 16, the video encoder (1603) includes an inter encoder (1630), an intra encoder (1622), a residual calculator (1623), a switch (16216), a residual encoder (1624), a general controller (1621), and an entropy encoder (1625) coupled together as shown in fig. 16.

The inter-encoder (1630) is configured to receive samples of a current block (e.g., a processing block), compare the block to one or more of the reference blocks (e.g., blocks in a previous picture and a subsequent picture), generate inter-prediction information (e.g., redundancy information description, motion vectors, merge mode information according to inter-coding techniques), and calculate inter-prediction results (e.g., predicted blocks) based on the inter-prediction information using any suitable technique. In some embodiments, the reference picture is a decoded reference picture that is decoded based on the encoded video information.

An intra encoder (1622) is used to receive samples of a current block (e.g., a processing block), in some cases compare the block to a block already encoded in the same picture, generate quantization coefficients after transformation, and in some cases also generate intra prediction information (e.g., according to intra prediction direction information of one or more intra coding techniques). In an embodiment, the intra-encoder (1622) also calculates an intra-prediction result (e.g., a predicted block) based on the intra-prediction information and a reference block in the same picture.

The universal controller (1621) is used to determine universal control data and control other components of the video encoder (1603) based on the universal control data. In an embodiment, the universal controller (1621) determines the mode of the block and provides control signals to the switch (16216) based on the mode. For example, when the mode is an intra mode, the universal controller (1621) controls the switch (16216) to select intra mode results for use by the residual calculator (1623) and controls the entropy encoder (1625) to select intra prediction information and add the intra prediction information in the bitstream; and when the mode is an inter mode, the universal controller (1621) controls the switch (16216) to select an inter prediction result for use by the residual calculator (1623), and controls the entropy encoder (1625) to select inter prediction information and add the inter prediction information in the bitstream.

The residual calculator (1623) is for calculating a difference (residual data) between the received block and a prediction result selected from the intra encoder (1622) or the inter encoder (1630). A residual encoder (1624) is operable based on the residual data to encode the residual data to generate transform coefficients. In an embodiment, a residual encoder (1624) is used to convert residual data from the time domain to the frequency domain and generate transform coefficients. The transform coefficients are then processed through quantization to obtain quantized transform coefficients. In various embodiments, the video encoder (1603) further comprises a residual decoder (1628). A residual decoder (1628) is used to perform the inverse transform and generate decoded residual data. The decoded residual data may be suitably used by an intra-frame encoder (1622) and an inter-frame encoder (1630). For example, the inter-encoder (1630) may generate a decoded block based on the decoded residual data and the inter-prediction information, and the intra-encoder (1622) may generate a decoded block based on the decoded residual data and the intra-prediction information. The decoded blocks are processed appropriately to generate decoded pictures, and in some embodiments, the decoded pictures may be buffered in a memory circuit (not shown) and used as reference pictures.

An entropy encoder (1625) is used to format the code stream to produce encoded blocks. The entropy encoder (1625) generates various information according to suitable standards, such as the HEVC standard. In an embodiment, an entropy encoder (1625) is used to obtain general control data, selected prediction information (e.g., intra prediction information or inter prediction information), residual information, and other suitable information in the bitstream. It should be noted that, according to the disclosed subject matter, when a block is encoded in an inter mode or a merge sub-mode of a bi-prediction mode, there is no residual information.

Embodiments of the present invention also provide a computer readable storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run.

Alternatively, in the present embodiment, the above-described storage medium may be configured to store a computer program for performing the steps of:

s1, acquiring coding parameters of a decoded video frame before a video frame to be decoded and coding parameters of a reference block in the decoded video frame, wherein the reference block is one block of a plurality of decoded blocks in the decoded video frame, the position of the reference block in the decoded video frame is the same as the position of a block to be decoded in the video frame to be decoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector;

and S3, decoding the block to be decoded by adopting the target resolution.

Or, alternatively, the storage medium is further arranged to store a computer program for performing the steps of:

s1, acquiring coding parameters of an encoded video frame before a video frame to be encoded and coding parameters of a reference block in the encoded video frame, wherein the reference block is one block of a plurality of encoded blocks in the encoded video frame, the position of the reference block in the encoded video frame is the same as the position of a block to be encoded in the video frame to be encoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector;

and S3, adopting the target resolution to code the block to be coded.

Optionally, the storage medium is further configured to store a computer program for executing the steps included in the method in the above embodiment, which is not described in detail in this embodiment.

Alternatively, in this embodiment, it will be understood by those skilled in the art that all or part of the steps in the methods of the above embodiments may be performed by a program for instructing a terminal device to execute the steps, where the program may be stored in a computer readable storage medium, and the storage medium may include: flash disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic or optical disk, and the like.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

The integrated units in the above embodiments may be stored in the above-described computer-readable storage medium if implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing one or more computer devices (which may be personal computers, servers or network devices, etc.) to perform all or part of the steps of the method described in the embodiments of the present invention.

In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

In several embodiments provided by the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, such as the division of the units, is merely a logical function division, and may be implemented in another manner, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims

1. A video decoding method, comprising:

acquiring coding parameters of a decoded video frame before a video frame to be decoded and coding parameters of one or more reference blocks in the decoded video frame, wherein the coding parameters of the decoded video frame are obtained by carrying out weighted summation on coding parameters of all video blocks included in the decoded video frame, the positions of the reference blocks in the decoded video frame are the same as the positions of the blocks to be decoded in the video frame to be decoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector;

Determining a target resolution for decoding the block to be decoded according to the coding parameters of the decoded video frame and the coding parameters of the reference block;

and decoding the block to be decoded by adopting the target resolution.

2. The method of claim 1, wherein the determining a target resolution for decoding the block to be decoded based on the encoding parameters of the decoded video frame and the encoding parameters of the reference block comprises:

carrying out weighted summation on the directional prediction mode of the decoded video frame and the directional prediction mode of the reference block to obtain a total directional prediction mode;

determining the target resolution as a first resolution in the case that the total directional prediction mode is greater than a first predetermined threshold;

determining the target resolution as a second resolution in the case that the total directivity prediction mode is less than or equal to the first predetermined threshold and greater than a second predetermined threshold, wherein the first resolution is less than the second resolution and the second predetermined threshold is less than the first predetermined threshold;

and determining the target resolution as a third resolution in the case that the total directivity prediction mode is smaller than or equal to the second predetermined threshold and larger than a third predetermined threshold, wherein the second resolution is smaller than the third resolution, and the third predetermined threshold is smaller than the second predetermined threshold.

3. The method of claim 1, wherein the determining a target resolution for decoding the block to be decoded based on the encoding parameters of the decoded video frame and the encoding parameters of the reference block comprises:

carrying out weighted summation on the quantization parameter of the decoded video frame and the quantization parameter of the reference block to obtain a total quantization parameter;

determining the target resolution as a first resolution if the total quantization parameter is greater than a fourth predetermined threshold;

determining the target resolution as a second resolution if the total quantization parameter is less than or equal to the fourth predetermined threshold and greater than a fifth predetermined threshold, wherein the first resolution is less than the second resolution and the fifth predetermined threshold is less than the fourth predetermined threshold;

and determining the target resolution as a third resolution in the case that the total quantization parameter is less than or equal to the fifth predetermined threshold and greater than a sixth predetermined threshold, wherein the second resolution is less than the third resolution and the sixth predetermined threshold is less than the fifth predetermined threshold.

4. The method of claim 1, wherein the determining a target resolution for decoding the block to be decoded based on the encoding parameters of the decoded video frame and the encoding parameters of the reference block comprises:

The length of the motion vector of the decoded video frame and the length of the motion vector of the reference block are weighted and summed to obtain the length of the total motion vector;

determining the target resolution as a first resolution in the case where the length of the total motion vector is greater than a seventh predetermined threshold;

determining the target resolution as a second resolution in the case that the length of the total motion vector is less than or equal to the seventh predetermined threshold and greater than an eighth predetermined threshold, wherein the first resolution is less than the second resolution and the eighth predetermined threshold is less than the seventh predetermined threshold;

and determining the target resolution as a third resolution in the case that the length of the total motion vector is smaller than or equal to the eighth predetermined threshold and larger than a ninth predetermined threshold, wherein the second resolution is smaller than the third resolution, and the ninth predetermined threshold is smaller than the eighth predetermined threshold.

5. The method of claim 1, wherein the obtaining coding parameters of a reference block in a decoded video frame preceding a video frame to be decoded comprises:

acquiring coding parameters of each of the plurality of covered decoded blocks in the case that the reference block covers the plurality of decoded blocks in the decoded video frame;

And taking the ratio of the area of each decoded block covered in the reference block to the total area of the reference block as a weight, and carrying out weighted summation calculation on the coding parameters of each decoded block to obtain the coding parameters of the reference block.

6. The method according to any one of claims 1 to 5, wherein the number of the reference blocks corresponding to the blocks to be decoded is the same or different for different blocks to be decoded, and wherein in the case that the number of the reference blocks is different, the decoding the blocks to be decoded with the target resolution further includes:

and obtaining a flag bit carried in the block to be decoded, wherein the flag bit is used for indicating the number relation between the block to be decoded and the reference block.

7. A video encoding method, comprising:

acquiring coding parameters of an encoded video frame before a video frame to be encoded and coding parameters of one or more reference blocks in the encoded video frame, wherein the coding parameters of the encoded video frame are obtained by carrying out weighted summation on coding parameters of all video blocks included in the encoded video frame, the positions of the reference blocks in the encoded video frame are the same as the positions of blocks to be encoded in the video frame to be encoded, and the coding parameters comprise at least one of the following: directional prediction mode, quantization parameter, length of motion vector;

Determining a target resolution for encoding the block to be encoded according to the encoding parameters of the encoded video frame and the encoding parameters of the reference block;

and adopting the target resolution to code the block to be coded.

8. The method of claim 7, wherein determining the target resolution for encoding the block to be encoded based on the encoding parameters of the encoded video frame and the encoding parameters of the reference block comprises:

carrying out weighted summation on the directional prediction mode of the coded video frame and the directional prediction mode of the reference block to obtain a total directional prediction mode;

9. The method of claim 7, wherein determining the target resolution for encoding the block to be encoded based on the encoding parameters of the encoded video frame and the encoding parameters of the reference block comprises:

carrying out weighted summation on the quantization parameter of the encoded video frame and the quantization parameter of the reference block to obtain a total quantization parameter;

10. The method of claim 7, wherein determining the target resolution for encoding the block to be encoded based on the encoding parameters of the encoded video frame and the encoding parameters of the reference block comprises:

The length of the motion vector of the coded video frame and the length of the motion vector of the reference block are weighted and summed to obtain the length of the total motion vector;

11. The method of claim 7, wherein the obtaining coding parameters of a reference block in an encoded video frame preceding a video frame to be encoded comprises:

acquiring coding parameters of each of the covered plurality of coded blocks in the case that the reference block covers the plurality of coded blocks in the coded video frame;

And taking the ratio of the area of each coded block covered in the reference block to the total area of the reference block as a weight, and carrying out weighted summation calculation on the coding parameters of each coded block to obtain the coding parameters of the reference block.

12. The method according to any one of claims 7 to 11, wherein the number of reference blocks corresponding to the blocks to be encoded is the same or different for different blocks to be encoded, and wherein the encoding the blocks to be encoded with the target resolution further comprises, in the case that the number of reference blocks is different:

setting a flag bit in encoded data obtained by encoding the block to be encoded, wherein the flag bit is used for indicating the number relation between the block to be encoded and the reference block.

13. A video decoding apparatus, comprising:

an obtaining unit, configured to obtain an encoding parameter of a decoded video frame preceding a video frame to be decoded and an encoding parameter of one or more reference blocks in the decoded video frame, where the encoding parameter of the decoded video frame is obtained by performing weighted summation on encoding parameters of all video blocks included in the decoded video frame, and a position of the reference block in the decoded video frame is the same as a position of a block to be decoded in the video frame to be decoded, where the encoding parameter includes at least one of: directional prediction mode, quantization parameter, length of motion vector;

A determining unit, configured to determine a target resolution for decoding the block to be decoded according to the encoding parameter of the decoded video frame and the encoding parameter of the reference block;

and the decoding unit is used for decoding the block to be decoded by adopting the target resolution.

14. A video encoding apparatus, comprising:

an obtaining unit, configured to obtain an encoding parameter of an encoded video frame preceding a video frame to be encoded and an encoding parameter of one or more reference blocks in the encoded video frame, where the encoding parameter of the encoded video frame is obtained by performing weighted summation on encoding parameters of all video blocks included in the encoded video frame, and a position of the reference block in the encoded video frame is the same as a position of a block to be encoded in the video frame to be encoded, where the encoding parameter includes at least one of: directional prediction mode, quantization parameter, length of motion vector;

a determining unit, configured to determine a target resolution for encoding the block to be encoded according to the encoding parameter of the encoded video frame and the encoding parameter of the reference block;

and the encoding unit is used for encoding the block to be encoded by adopting the target resolution.

15. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method according to any of the claims 1-6 or 7-12 by means of the computer program.