WO2009086766A1

WO2009086766A1 - A quantization mode and an encoding and decoding method, an encoder and a decoder and a codec system

Info

Publication number: WO2009086766A1
Application number: PCT/CN2008/073338
Authority: WO
Inventors: Jianhua Zheng; Xiaozhen Zheng
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-12-04
Filing date: 2008-12-04
Publication date: 2009-07-16
Also published as: CN101453643B; CN101453643A

Abstract

A quantization mode and the corresponding image encoding and decoding method, an encoder and a decoder and a CODEC system. The encoding method of the quantization mode includes: acquiring the code stream value based on the quantization mode of current encoding block; writing the code stream value of the quantization mode into the image code stream. The image encoding method includes: determining the quantization mode of current coding block in the input image; acquiring the quantized current coding block data based on process of scaling or quantizing the current encoding block; acquiring the code stream value of the quantization mode based on quantization mode of the current encoding block; encoding the quantized current coding block data to acquire the image code stream, and writing the code stream value of the quantization mode in the image stream. By writing the determined quantization mode of the current coding block in the encoded data without decision-making of the quantization mode in the decoder terminal, acquiring quantization mode of the current block through decoding directly, the said method reduces the computational burden and the realization cost of the decoder.

Description

Quantization mode and image encoding and decoding method, encoder and decoder, and codec system. The present application claims to be filed on December 4, 2007, the application number is CN 20071 0193851. 2. The invention name is "quantization mode, image coding" The priority of the Chinese application, the decoding method, the coder, the decoder and the system, the entire contents of which are incorporated herein by reference. Technical field

Embodiments of the present invention relate to codec techniques, and in particular, to a quantization mode and a corresponding image encoding and decoding method, an encoder and a decoder, and a codec system.

Background technique

In image coding and decoding technology, it is usually necessary to divide an image into coded blocks and then perform encoding processing. The orthogonal transform processing is performed on the image divided into coded blocks, and the corresponding block transform coefficients are obtained, and the block transform coefficients are further subjected to quantization rounding calculation, and the entropy coding can finally obtain the compression-coded code stream corresponding to the image. Thus, an encoding operation for an image is achieved.

Since the image content in a sequence is not exactly the same, there will be a big change, that is, the details of the image in the same image sequence are different, so if the same sequence is used for the entire sequence, the same quantization matrix is used. Quantization processing obviously does not achieve the subjective quality of the image after optimal quantization coding. Similarly, for a certain image in a sequence, the content of each region of the image is also different, and the same quantization quality is used for each region or macroblock of the same image, and the optimal quantization and coding cannot be achieved. Subjective quality of the image.

The macroblock-level adaptive quantization technique is to provide a macroblock quantization codec method, and in the image coding and decoding process, the macroblock quantization quality can be changed according to the content of each macroblock image. In the prior art, a macroblock-level adaptive quantization codec technology is provided, in which a technique of predicting a current block feature by using neighboring block coded information is used, so that different macros are selected according to the predicted macroblock feature in quantization. Block quantization quality. The neighboring block coding information includes block mode information of the neighboring block, prediction Information, motion vector information, etc., which can reflect the image characteristics of the current block. As shown in FIG. 1 , which is a schematic diagram of a macroblock in the prior art, where the current block is E, the adjacent blocks of E are A, B, C, and D, and the block sizes of block E and blocks A, B, C, and D can be The same, can also be different. The adjacent blocks in the vertical direction of block E are A and D, and the adjacent blocks in the horizontal direction are B and! ) or C and D. The adjacent boundary block of E is called a direct neighboring block of E, and the adjacent block of the adjacent boundary block of E is called an indirect neighboring block of E.

2 is a schematic diagram of a prior art image codec system, where the encoder 1 includes a transform module 2, a scaling or quantization module 3, a first quantization mode decision module 4, and an entropy encoding module 5. The decoder 6 includes An entropy decoding module 7, an inverse scaling or inverse quantization module 8, a second quantization mode decision module 9 and an inverse transform module 10, wherein the first quantization mode decision module 4 utilizes block mode information and macroblock size of neighboring blocks in the encoding process And parameter information such as prediction information, before quantifying the current block, determining a quantization mode of the current block according to a result of determining whether the current block is a detail region.

The above macroblock-level adaptive quantization codec method divides the quantization mode into the following categories: Quantization mode A, which is the default quantization mode, and the quantization matrix used in coding is the same as the current default quantization matrix;

Quantization mode B, in order to preserve the detail quantization mode, the quantization matrix used in encoding allows the quantized image to retain image details;

The quantization mode C is a non-detail quantization mode, and the quantized image does not need to retain image details. According to the visual characteristics of a person, the quantization mode of the decision current block generally needs to follow the following criteria:

(1) If the current block is the detail area of the image, the quantization mode used should retain more high-frequency information, that is, use a high-quality quantization mode;

(2) If the current block is the motion edge part of the image, the quantization mode used should retain more high-frequency information, that is, use a high-quality quantization mode;

(3) The current block is a region with relatively strong motion. If the appropriate decline in objective quality does not have a large impact on subjective quality, a coarser quantization mode can be used, that is, a low-quality quantization mode is used. The quantization mode decision is actually a set of decision rules satisfying the above decision criteria, and the current block quantization quality is determined according to different frame types and different neighbor block coding information, and the decision result is the current block quantization mode. .

Specifically, in the encoding process, the first quantization mode decision module 4 uses the parameter information such as the block mode information, the macroblock size, and the prediction information of the neighboring block to determine the quantization mode of the current block through a preset criterion. In the decoding process, the second quantization mode decision module 9 uses the parameter information such as the block mode information, the macroblock size, and the prediction information of the neighboring block to determine the quantization mode of the current block through a preset criterion. The set criterion is to set a corresponding quantization mode according to the parameter information of the neighboring block.

The above prior art has at least the following problems:

(1) Both the encoder 1 and the decoder 6 include a quantization mode decision module, that is, both the encoding and decoding methods need to perform a quantization mode decision algorithm, which increases the computational burden and implementation cost of the decoder;

(2) The fixed quantization mode decision algorithm determines the result of the quantization mode, making the quantitative decision method inflexible. Summary of the invention

The embodiment of the invention provides a quantization mode and a corresponding image encoding and decoding method, an encoder and a decoder, and a codec system, so that the decoding end can obtain the quantization mode according to the decoded code stream, and reduce the quantization mode decision at the decoding end. The computational complexity.

The embodiment of the invention provides a quantization mode coding method, including:

Obtaining a quantized mode code stream value according to a quantization mode of the current coding block;

The quantized mode code stream value is written into the image code stream.

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

Obtaining a quantization mode code stream value of the current decoded block from the image code stream;

A quantization mode of the current decoded block is obtained according to the quantized mode code stream value.

An embodiment of the present invention provides a quantization mode encoder, including: a quantization mode coding module, configured to obtain a quantization mode code stream value according to a quantization mode of the current coding block;

And an image stream insertion module, configured to write the quantized mode code stream value into the image code stream.

An embodiment of the present invention provides a quantization mode decoder, including:

a quantization mode code stream obtaining module, configured to obtain, from the image code stream, a quantized mode code stream value of the current decoded block;

And a quantization mode decoding module, configured to obtain, according to the quantized mode code stream value, a quantization mode of the current decoded block.

An embodiment of the present invention provides a quantization mode codec system, including: a quantization mode encoder and a quantization mode decoder;

The quantization mode encoder includes:

a quantization mode coding module, configured to obtain a quantized mode code stream value according to a quantization mode of the current coding block;

An image code stream insertion module, configured to write the quantized mode code stream value into the image code stream; the quantization mode decoder includes:

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

Determining a quantization mode of a current coded block in the input image;

Performing scaling or quantization processing on the current coding block according to the quantization mode, to obtain quantized current coding block data;

The quantized current coded block data is encoded to obtain an image code stream, and the quantized mode code stream value is written into the image code stream. An embodiment of the present invention provides an image decoding method, including:

And parsing the current decoded block data and the corresponding quantized mode code stream value from the image code stream; and obtaining a quantization mode of the current decoded block according to the quantized mode code stream value;

Performing inverse scaling or inverse quantization processing on the current decoded block data by using the quantization mode to obtain the dequantized current decoded block data;

A decoded image is obtained based on the dequantized current decoded block data.

An embodiment of the present invention provides an image encoder, including:

a quantization mode decision module, configured to determine a quantization mode of a current coding block in the input image; a scaling or quantization processing module, configured to perform scaling or quantization processing on the current coding block according to the quantization mode, to obtain quantized current coding block data;

And an image coding module, configured to encode the quantized current coded block data to obtain an image code stream; and the image code stream insertion module is configured to write the quantized mode code stream value into the image code stream. An embodiment of the present invention provides an image decoder, including:

a parsing module, configured to parse the current decoded block data from the image code stream;

a quantization mode decoding module, configured to obtain, according to the quantized mode code stream value, a quantization mode of a current decoded block;

An inverse scaling or inverse quantization module, configured to perform inverse scaling or inverse quantization processing on the current decoded block data by using the quantization mode to obtain dequantized current decoded block data;

And a decoded image generating module, configured to obtain a decoded image according to the dequantized current decoded block data.

An embodiment of the present invention provides an image coding and decoding system, including: an image encoder and an image decoder; The image encoder includes:

An image coding module, configured to encode the quantized current coded block data to obtain an image code stream; and an image code stream insertion module, configured to write the quantized mode code stream value into the image code stream; the image decoder Includes:

The quantization mode and the corresponding image encoding and decoding method, the encoder and the decoder, and the codec system provided by the embodiments of the present invention do not need to be quantized at the decoder end by writing the determined current coding block quantization mode into the encoded data. Mode decision, the current block quantization mode can be obtained directly by decoding, which reduces the computational burden and implementation cost of the decoder. DRAWINGS

1 is a schematic diagram of a macroblock in the prior art;

2 is a schematic diagram of an image coding and decoding system in the prior art; 3 is a flowchart of a quantization mode encoding method according to an embodiment of the present invention;

4 is a flowchart of a quantization mode decoding method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a quantization mode encoder according to an embodiment of the present invention; FIG.

6 is a schematic diagram of a quantization mode decoder according to an embodiment of the present invention;

7 is a schematic diagram of a quantization mode codec system according to an embodiment of the present invention;

8 is a flowchart of an image encoding method according to an embodiment of the present invention;

FIG. 9 is a flowchart of determining a current coding block quantization mode in an image coding method according to an embodiment of the present invention; FIG. 10 is a flowchart of an image decoding method according to an embodiment of the present invention;

11 is a schematic diagram of an image encoder according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of an image decoder according to an embodiment of the present invention; FIG.

FIG. 13 is a schematic diagram of an image coding and decoding system according to an embodiment of the present invention. detailed description

The technical solutions of the embodiments of the present invention are further described in detail below with reference to the accompanying drawings and embodiments.

The quantization mode, the image coding, the decoding method, the encoder, the decoder and the system provided by the embodiments of the present invention do not need to be quantized at the decoder end by encoding the quantization mode of the current coding block and writing into the image code stream. Mode decision, the quantization mode of the current coding block can be obtained directly by decoding.

For convenience of description, before performing the method of the embodiment of the present invention, it is presupposed that there are three types of quantization modes: quantization mode, quantization mode ^ quantization mode (. The input image P is divided into macro blocks according to macroblocks:

MB ₀₀ MB _0l MB ₀₂ MB,

MB _W MB _n MB _n MB,

P=

MB ₂₀ MB _2l MB ₂₂ MB,

MB ₃₀ MB _3l MB ₃₂ MB,

1 Where M is a macroblock representing the position of the image at (i, j). For each macroblock M in P, it is now necessary to determine its corresponding quantization mode.

Assume that the result of the quantization mode corresponding to the current image according to the macroblock is:

^00 ^02 ^03

^B nr ^13

r

^30 r ^31 c r ^33

Among them, A, B, and C are three kinds of quantization modes, and the lower subscript indicates the position of the macroblock in the image P. For example, 4,. indicates that the quantization mode of the macroblock is A at the (i, j) position. As shown in FIG. 3, it is a flowchart of a quantization mode coding method according to an embodiment of the present invention, which specifically includes the following steps:

Step 101: Obtain a quantized mode code stream value according to a quantization mode of the current coding block. Step 102: Write the quantized mode code stream value into an image code stream.

In step 101, according to the quantization mode of the current coding block, obtaining the quantization mode code stream value may include: encoding the quantization mode result of the current coding block; or including: converting the quantization mode result of the current coding block by a function relationship Encode.

The above coding may be direct coding or entropy coding. Direct coding refers to the result of transforming the quantization mode result of the current coding block or the quantization mode of the current coding block through a functional relationship as a quantization mode code stream value.

When direct coding is used, and the encoded object is the quantization mode result of the current coding block, the quantization mode result of the current coding block is directly written into the coded code stream;

In other words, will be M _0t fe. The quantization mode of the corresponding position in _Mi is directly written into the corresponding macroblock code stream. The corresponding quantization mode is ₂₁ at M ₂₁ , and therefore, the quantization mode B is written into the code stream of the macro block B ₂₁ .

When the direct encoding is used, and the encoded object is the result of the function mode transformation of the quantization mode of the current coding block, the quantization mode result of the current coding block is transformed according to a certain functional relationship and then encoded. For example, the corresponding quantization mode result of the image is divided into macroblocks. _{Μί is} used as a quantization mode image for secondary transform coding. Wherein each pixel value in the quantized mode image is a quantized mode value in the image frame.

When entropy coding is used, the encoded object is written into the coded code stream according to a determined entropy coding method, including but not limited to index coding, fixed length coding, run length coding, variable length coding (VLC). , such as context-based variable length coding CAVLC, etc.), arithmetic coding (AC, such as Huffman coding, context-based arithmetic coding CABAC, etc.) or any combination of the above methods.

The index encoding method is implemented as follows:

In this embodiment, as shown in Table 1, it is still assumed that three quantization modes, A mode, B mode, and C mode, are used, and the index value may be binary code. Therefore, binary coding of 2bi t may be used for the three quantization modes. Represents an index value. Assume that a comparison table of quantization mode and index value is preset, as shown in Table 1:

Table 1. Comparison table between quantization mode and index value

In order to reduce the number of bits occupied by the index value during entropy coding, the above index value may also be represented by a binary variable length code of l-3bi t, and the binary variable length code has a correspondence relationship with the index value, thereby establishing a correspondence relationship with the quantization mode. , a preset comparison table of the quantization mode, the index value and the binary variable length code, as shown in Table 2:

Table 2. Comparison table of quantization mode, index value and binary variable length code

Index value binary variable length code quantization mode 00 1 A mode: default mode

01 010 B mode: Non-reserved detail mode

10 Oi l C mode: Preserving the detail mode The above three types of quantization modes are a specific example of the embodiment of the present invention. The type of the quantization mode in the embodiment of the present invention is not limited to the above three types, and may be set to be more than three types in advance. The type of quantization mode makes the type of quantization mode more abundant.

The quantized mode code stream value is obtained by using the determined coding method in step 101, and the quantized mode code stream value is the coded value of the quantization mode in the image code stream.

For example, if the quantization mode is expressed in the form of an index value, the index value of the quantization mode is the quantization mode code stream value in the image code stream. If the above Table 1 is used, the quantization mode code stream value corresponding to the quantization mode c is 11. If the quantization mode is expressed in the form of a binary variable length code, if the above Table 2 is used, the quantization mode code stream value corresponding to the quantization mode C is 011.

In step 102, the quantized mode code stream value is written into the image code stream, and the existence position of the specific quantization mode in the image code stream may be:

(1) Write the quantized mode code stream value to the macroblock level code stream of the image, as written in macrob lock (). Table 3 Write the quantization mode to the macroblock code stream.

Where block (i) represents a macroblock subblock included in the macroblock, mb_wq_mode is a quantization mode corresponding to the macroblock, and U(2) is encoded by a binary integer, that is, a maximum of four types of quantization mode types are allowed to be changed. Form. This allows each macroblock to have a corresponding quantization mode.

(2) writing the quantized mode code stream value to the macroblock sub-block code stream of the image, such as writing to the macroblock sub-block block (), and Table 4 writing the quantization mode to the macroblock sub-block code stream.

Where mb_wq_mode is the quantization mode corresponding to the macroblock sub-block, and is encoded by the entropy coding method se(v). At this point, each sub-block of the macroblock is allowed to have a corresponding quantization mode.

(3) Combining the quantized mode code stream values into a quantized mode image according to the arrangement position of the current coded block in the image, and encoding and writing into the image code stream.

(4) Write the quantized mode code stream value as a Supplemental Enhancement Information (SEI) message to the image code stream, as shown in Table 5. Table 5 Quantization mode is written into the SEI message of the code stream.

The SEI message structure of the code stream is SEI_Message(), mb_wq_mode_id represents the quantized mode code stream value existing in the code stream, and mb_wq_mode (i) represents the quantization mode according to the macroblock in the code stream. Code stream value.

The quantization mode coding method provided by the embodiment of the present invention encodes the quantization mode of the current coding block and writes it into the image code stream, so that the quantization mode decision algorithm does not need to be performed at the decoder end. The quantization mode of the current coding block can be obtained directly by decoding, which reduces the computational burden and implementation cost of the decoder.

As shown in FIG. 4, it is a flowchart of a quantization mode decoding method according to an embodiment of the present invention, which specifically includes the following steps:

Step 201: Obtain a quantization mode code stream value of a current coding block from an image code stream.

Step 202: Obtain a quantization mode of the current decoded block according to the quantized mode code stream value. In this embodiment, the location of the specific quantization mode code stream value in the image code stream may be referred to the content described in the quantization mode coding method in the embodiment of the present invention. Therefore, in step 201, the current coded block is obtained from the image code stream. The quantizing mode code stream value may include: obtaining a quantization mode code stream value of the current decoding block from the image macroblock code stream; and may further include: acquiring a quantization mode code stream of the current decoding block from the sub-block code stream included in the image macroblock The value may also include: acquiring a quantization mode image of the current image from the image code stream and decoding, and determining a quantization mode code stream value of the current decoded block according to an arrangement position of the current decoded block in the image. The method may further include: obtaining a quantization mode of the current image macroblock from the SE I message of the image code stream and decoding, and determining a quantization mode code stream value of the current decoded block.

The quantization mode decoding method of this embodiment can correspond to the quantization mode encoding method of the embodiment of the present invention.

When direct coding is used in the coding method, and the coded object is the quantization mode result of the current coding block, the step 202 may include: using the quantization mode code stream value as the quantization mode of the current decoding block.

When the encoding method is directly encoded, and the encoded object is the result of the function mode transformation of the quantization mode of the current coding block, the step 202 may include: after inversely transforming the quantization mode code stream value through a function relationship The result is the quantization mode of the current decoded block.

When entropy coding is used in the coding method, the step 202 may include: entropy decoding the quantized mode code stream value, or performing entropy decoding and inverse function transformation on the quantized mode code stream value to obtain a current The quantization mode of the decoded block.

The entropy decoding method includes but is not limited to index, fixed length decoding, run length decoding, variable length decoding (VLC, such as context-based variable length decoding CAVLC, etc.), arithmetic decoding (AC, such as Huffman decoding, context-based arithmetic decoding CABAC, etc.) or any combination of the above.

The quantization mode decoding method provided by the embodiment of the present invention does not need to execute the quantization mode decision algorithm, and can directly obtain the quantization mode of the current coding block by decoding, which reduces the computational burden and implementation cost of the decoder.

As shown in FIG. 5, a schematic diagram of a quantization mode encoder according to an embodiment of the present invention includes: a quantization mode coding module 11 configured to obtain a quantization mode code stream value according to a quantization mode of a current coding block; and an image code stream insertion module 12 And for writing the quantized mode code stream value into the image code stream.

The quantization mode encoding module 11 may include a first quantization mode encoding module, configured to use the result of the quantization mode result of the current coding block or the quantization mode of the current coding block by a function relationship as a quantization mode code stream value.

The quantization mode encoding module 11 may further include a second quantization mode encoding module for encoding the result of the quantization mode result of the current coding block or the quantization mode of the current coding block by a function relationship to obtain a quantization mode code stream value.

The second quantization mode coding module may further include a quantization mode entropy coding module, configured to entropy encode the result of the quantization mode result of the current coding block or the quantization mode of the current coding block by a function relationship to obtain a quantization mode code stream value.

The image stream insertion module 12 may include: an image macroblock stream insertion module, configured to write the quantized mode stream value to the currently encoded macroblock stream in the image; or, the image macroblock subblock stream insertion module And for writing the quantized mode code stream value into the sub-block code stream included in the currently coded macroblock in the image; or, the image code stream SEI message insertion module, configured to write the quantized mode code stream value to the image code stream The SEI message is in the code stream.

The image stream insertion module 12 may further include: a quantization mode image encoding unit, configured to combine the quantized mode code stream values into a quantized mode image according to an arrangement position of the current coding block in the image, and encode the insertion unit, The encoded quantized mode image is written into the image code stream.

The quantization mode encoder provided by the embodiment of the present invention compiles the quantization mode of the current coding block The code is written into the image code stream so that the quantization mode decision algorithm does not need to be performed at the decoder end, and the quantization mode of the current coding block can be obtained directly by decoding, which reduces the computational burden and implementation cost of the decoder.

As shown in FIG. 6, a schematic diagram of a quantization mode decoder according to an embodiment of the present invention includes: a quantization mode code stream obtaining module 21, configured to obtain a quantization mode code stream value of a current decoding block from an image code stream; The module 22 is configured to obtain, according to the quantized mode code stream value, a quantization mode of the current decoded block.

The quantization mode code stream obtaining module 21 may include: a quantization mode macroblock code stream acquiring module, configured to obtain a quantization mode code stream value of the current decoding block from the image macroblock code stream; or, a quantization mode macroblock subblock stream And an obtaining module, configured to obtain, from the sub-block code stream included in the image macroblock, a quantization mode code stream value of the current decoded block; or, a quantization mode SEI message code stream obtaining module, configured to obtain a current from the SEI message code stream of the image The quantized mode code stream value of the image decoding block.

The quantization mode code stream obtaining module 21 may further include: a quantization mode image decoding unit, configured to acquire and decode a quantization mode image of the current image from the image code stream; and a determining unit configured to arrange the position of the current decoded block in the image A quantized mode stream value of the current decoded block is determined.

The quantization mode decoding module 22 may include a first quantization mode decoding module, configured to use the result of inverse transforming the quantization mode code stream value or the quantization mode code stream value as a quantization mode of the current decoding block.

The quantization mode decoding module 22 includes a second quantization mode decoding module for decoding the quantized mode code stream value or decoding the quantized mode code stream value and inversely transforming the function relationship to obtain a quantization mode of the current decoded block.

The second quantization mode decoding module may further include a quantization mode entropy decoding module, configured to perform entropy decoding on the quantized mode code stream value or perform entropy decoding and inverse function transformation on the quantized mode code stream value to obtain a current decoded block. Quantization mode.

The quantization mode decoder provided by the embodiment of the present invention does not need to perform a quantization mode decision algorithm, and can obtain the quantization mode of the current coding block directly by decoding, thereby reducing the computational burden of the decoder and Achieve costs.

As shown in FIG. 7, it is a schematic diagram of a quantization mode codec system according to an embodiment of the present invention, which includes a quantization mode coder 31 and a quantization mode decoder 32.

The quantization mode encoder 31 includes: a quantization mode encoding module 1 1 configured to obtain a quantization mode code stream value according to a quantization mode of the current coding block; and an image code stream insertion module 12, configured to write the quantization mode code stream value to In the image stream.

The quantization mode decoder 32 includes: a quantization mode code stream acquisition module 21, configured to obtain a quantization mode code stream value of the current decoding block from the image code stream; a quantization mode decoding module 22, configured to use the quantization mode code stream value, The quantization mode of the current decoded block is obtained.

The quantization mode codec system of the embodiment of the present invention may further include any of the quantization mode decoders described in the quantization mode encoder of the embodiment of the present invention and any of the quantization mode decoders described in the quantization mode decoder of the embodiment of the present invention. Device.

The quantization mode codec system provided by the embodiment of the present invention encodes the quantization mode of the current coding block and writes it into the image code stream, so that the quantization mode decision algorithm does not need to be performed at the decoder end, and the current can be obtained through decoding. The quantization mode of the coding block reduces the computational burden and implementation cost of the decoder.

As shown in FIG. 8, a flowchart of an image coding method according to an embodiment of the present invention specifically includes the following steps:

Step 301: Determine a quantization mode of a current coding block in the input image.

Step 302: Perform scaling or quantization processing on the current coding block according to the quantization mode, to obtain quantized current coding block data.

Step 303: Obtain a quantized mode code stream value according to a quantization mode of the current coding block. Step 304: encode the quantized current coding block data to obtain an image code stream, and write the quantized mode code stream value to the image code. In the stream.

The order of execution of the above steps 302 and 303 can be interchanged.

The following describes in detail how to determine the quantization mode of the current coding block in combination with a specific example, the determination The method may include: determining a quantization mode of the current block according to the neighboring block coding information of the current coding block; and may further include: determining a quantization mode of the current block according to the quantization mode decision method of the external extended input;

The method may further include: obtaining a quantization mode of the current block according to a quantization mode of the current coding block input by the external extension;

It may also include: a comprehensive decision of the above three methods to obtain a quantization mode of the current block.

The quantization mode of the current coding block may be used to determine the quantization mode of the current coding block according to the above three different methods or combinations of methods. Here, an example is given to determine how to determine the quantization mode of the current block when there are two or more methods.

When the above three methods determine the quantization mode of the current block, the effects on the final quantization mode result are sequentially in order of priority, the externally input quantization mode, the externally input quantization mode decision method, the quantization mode, and the neighboring block coding information. The quantitative model of decision making.

When there is no externally input quantization mode decision method, the quantization mode decision method based on the current coding block neighboring coding information is used as the quantization mode decision method used by the current coding by default; otherwise, if there is an external input quantization mode decision method, the use is performed. An externally input quantization mode decision method is used as a quantization mode decision method for current coding;

When there is no externally input quantization mode, the quantization mode determined by the quantization mode decision method used in the current encoding is used as the quantization mode of the current block by default; otherwise, if there is an externally input quantization mode, the externally input quantization mode is directly used as the quantization mode. The quantization mode of the current block.

As shown in FIG. 9, a flowchart for determining a current coding block quantization mode in an image coding method according to an embodiment of the present invention includes:

Step 401: First, it is determined whether there is an external input quantization mode, and if yes, step 407 is performed, that is, for the current coding block, the quantization mode directly uses the externally input quantization mode; otherwise, step 402 is performed;

Step 402: When there is no externally input quantization mode, the quantization mode decision method needs to be used to determine the quantization mode of the current coding block. In this case, the neighbor block coding information of the current block needs to be obtained. To quantify the input of decision making methods;

Step 403: Determine whether there is an externally input quantization mode decision method, and if yes, execute step 405, that is, the current quantization mode decision method, using an externally input quantization mode decision method; otherwise, execute step 404, that is, there is no external input quantization mode When making a decision method, use the current default quantization mode decision method;

Step 404: When there is no externally input quantization mode decision method, the current default quantization mode decision method is used; the current default quantization mode decision method is to determine the quantization mode of the current coding block according to the coding information of the neighboring block, and the decision method is implemented. Defining a fixed decision rule, that is, performing step 406;

Step 405: Determine and update a current quantization mode decision method. When there is an externally input quantization mode decision method, use an externally input quantization mode decision method to update a default quantization mode decision method as a quantization mode decision method used by the current coding;

Step 406: Determine the current quantization mode decision method according to the current quantization mode decision method determined in step 404 or step 405, and determine the quantization mode of the current coding block according to the neighbor block coding information of the current coding block. Step 407: Output the current coding block The quantization mode is used for the scaling/quantization operation of the current coding block.

In the above process of determining the quantization mode, the user can customize the quantization mode decision method and the quantization mode decision result through the external input quantization mode and/or the quantization mode decision method, thereby flexibly changing the quantization decision process and enriching the decision result.

On the basis of the foregoing, further, in step 303, obtaining the quantized mode stream value according to the quantization mode of the current coding block may include: encoding the quantization mode result of the current coding block; and may further include: The result of the quantization mode is encoded after the function relationship transformation.

When direct encoding is used, and the encoded object is the result of the quantization mode of the current coding block, The quantization mode result of the current coding block is directly written into the coded code stream;

That is to say, the quantization mode of the corresponding position is directly written into the corresponding macroblock code stream. The quantization mode B is written to the code stream of the macroblock Affi ₂₁ as the corresponding quantization mode at ^© ₂₁ .

When the direct encoding is used, and the encoded object is the result of the function of the quantization mode of the current coding block, the quantization mode result of the current coding block is transformed according to a certain functional relationship and then encoded.

For example, the corresponding quantization mode result of the image is divided into macroblocks. _{Μί is} used as a quantization mode image for secondary transform coding. Wherein each pixel value in the quantized mode image is a quantized mode value in the image frame.

The index coding method may employ an embodiment of the index coding method described in the quantization mode coding method of the embodiment of the present invention.

In step 304, the quantized mode code stream value is written into the image code stream, and the existence position of the specific quantization mode code stream value in the image code stream may be: (1) writing the quantized mode code stream value to the macroblock level of the image. (2) writing the quantized mode code stream value to the macroblock sub-block code stream of the image; (3) combining the quantized mode code stream values into a quantized mode image according to the arrangement position of the current coding block in the image; And encode, write to the image stream. (4) Write the code stream value of the quantization mode into the SEI message code stream of the image code stream.

The image coding method provided by the embodiment of the present invention encodes the quantization mode of the current coding block and writes it into the image code stream, so that the quantization mode decision algorithm is not required to be performed at the decoder end, and the current coding block can be obtained directly by decoding. The quantization mode reduces the computational burden and implementation cost of the decoder; further, the user can customize the change quantization mode decision method and the quantization mode decision result, Thereby, it is possible to flexibly change the quantitative decision process and enrich the decision result.

As shown in FIG. 10, it is a flowchart of an image decoding method according to an embodiment of the present invention, which specifically includes the following steps:

Step 501: Parsing the current decoded block data and the corresponding quantization mode code stream value from the image code stream;

Step 502: Obtain a quantization mode of the current decoded block according to the quantized mode code stream value. Step 503: Perform inverse scaling or inverse quantization processing on the current decoded block data by using the quantization mode to obtain dequantized current decoded block data. ;

Step 504: Obtain a decoded image according to the dequantized current decoded block data.

In this embodiment, the location of the specific quantization mode code stream value in the image code stream may refer to the content described in the image coding method of the embodiment of the present invention. Therefore, the current decoded block data is parsed from the image code stream in step 501. The corresponding quantized mode code stream value may include: parsing the current decoded block data corresponding to the quantized mode code stream value from the image macroblock code stream; and may further include: parsing the current decoded block from the sub-block code stream included in the image macroblock The data corresponds to the quantized mode code stream value; and may further include: parsing and decoding the quantized mode image of the current image from the image code stream, and determining the quantized mode code stream value of the current decoded block data according to the arrangement position of the current decoded block in the image. The method may further include: parsing a quantization mode of the current image macroblock from the SEI message of the image code stream, and determining a quantization mode code stream value of the current decoded block.

The image decoding method of this embodiment can correspond to the image decoding method of the embodiment of the present invention.

When direct coding is used in the coding method, and the coded object is the quantization mode result of the current coding block, the step 502 may include: using the quantization mode code stream value as the quantization mode of the current decoding block.

When the encoding method is directly encoded, and the encoded object is the result of the function mode transformation of the quantization mode of the current coding block, the step 502 may include: after inversely transforming the quantization mode code stream value through a function relationship The result is the quantization mode of the current decoded block.

When entropy coding is used in the coding method, the step 502 may include: using the quantization mode The code stream value is entropy decoded, or the quantization mode code stream value is entropy decoded and the function relationship is inversely transformed to obtain a quantization mode of the current decoded block.

The entropy decoding method includes but is not limited to index, fixed length decoding, run length decoding, variable length decoding

(VLC, such as context-based variable length decoding CAVLC, etc.), arithmetic decoding (AC, such as Huffman decoding, context-based arithmetic decoding CABAC, etc.) or any combination of the above methods.

The image decoding method provided by the embodiment of the present invention does not need to perform the quantization mode decision algorithm, and the quantization mode of the current coding block can be obtained directly by decoding, which reduces the computational burden and the implementation cost of the decoder.

As shown in FIG. 11 , a schematic diagram of an image encoder according to an embodiment of the present invention includes: a quantization mode decision module 41, configured to determine a quantization mode of a current coding block in an input image; and a scaling or quantization processing module 42 configured to The quantization mode performs scaling or quantization processing on the current coding block to obtain the quantized current coding block data. The quantization mode coding module 43 is configured to obtain a quantization mode code stream value according to the quantization mode of the current coding block. The image coding module 44 And for encoding the quantized current coded block data to obtain an image code stream; and the image code stream insertion module 45 is configured to write the quantized mode code stream value into the image code stream.

The quantization mode decision module 41 may include a neighboring block decision module, configured to determine a quantization mode of the current coded block according to neighbor block coding information of the current coded block.

The quantization mode decision module 41 may also include an external decision module for determining the quantization mode of the current coded block based on the externally input quantization mode decision method or quantization mode.

The quantization mode decision module 41 may further include: a neighboring block decision module, configured to determine a first level quantization mode of the current coding block according to the neighboring block coding information of the current coding block; and an external decision module for performing quantization according to the external input a mode decision method or a quantization mode, determining a second-level quantization mode or a third-level quantization mode of the current coding block; an integrated decision module, configured to use the first-level quantization mode, the second-level quantization mode, and the third-level according to the current coding block The quantization mode determines the quantization mode of the current coded block.

The priority of the quantization mode decision module 41 is: according to the external input quantization mode The third-level quantization mode determined by the partial decision module has the highest priority; the second-level quantization mode priority determined by the external decision module of the externally input quantization mode decision method; the first determined by the neighboring block decision module The primary quantization mode has the lowest priority; when determining the quantization mode of the current coding block, the quantization mode determined by the higher priority quantization mode decision module replaces the quantization mode determined by the lower priority quantization mode decision module.

The quantization mode encoding module 43 may include a first quantization mode encoding module, configured to use the result of the quantization mode result of the current coding block or the quantization mode of the current coding block by a function relationship as a quantization mode code stream value.

The quantization mode encoding module 43 may further include a second quantization mode encoding module for encoding the result of the quantization mode result of the current coding block or the quantization mode of the current coding block by a function relationship to obtain a quantization mode code stream value.

The image stream insertion module 45 may include an image macroblock or a sub-block stream insertion module, configured to write the quantized mode stream value to the currently encoded macroblock stream in the image or the subblock included in the currently encoded macroblock. In the code stream.

The image stream insertion module 45 may further include: a quantization mode image encoding unit, configured to combine the quantized mode code stream values into a quantized mode image according to an arrangement position of the current coding block in the image, and encode the insertion unit, The encoded quantized mode image is written into the image code stream.

The image code stream insertion module 45 may further include: a quantization mode SEI message code stream insertion module, configured to write the code stream value of the quantization mode into the SEI message code stream of the image.

The image encoder provided by the embodiment of the present invention encodes the quantization mode of the current coding block and writes it into the image code stream, so that the quantization mode decision algorithm is not required to be performed at the decoder end, and the current coding block can be obtained directly by decoding. The quantization mode reduces the computational burden and implementation cost of the decoder; further, the user can customize the quantization mode decision method through an external decision module and Quantitative mode decision results, which can flexibly change the quantitative decision process and enrich the decision results. As shown in FIG. 12, it is a schematic diagram of an image decoder according to an embodiment of the present invention, which specifically includes: a parsing module 51, configured to parse a current decoded block data from an image code stream; and a quantization mode code stream acquiring module 52, configured to Obtaining a quantized mode code stream value of the current decoded block in the code stream; a quantization mode decoding module 53, configured to obtain a quantization mode of the current decoded block according to the quantized mode code stream value; and an inverse scaling or inverse quantization module 54 for Performing inverse scaling or inverse quantization processing on the current decoded block data to obtain the dequantized current decoded block data; the decoded image generating module 55 is configured to obtain decoding according to the dequantized current decoded block data. image.

The quantization mode code stream acquisition module 52 may include: a quantization mode macroblock code stream acquisition module, configured to obtain a quantization mode code stream value of the current decoding block from the image macroblock code stream; or a quantization mode macroblock sub-block code stream acquisition. And a module, configured to obtain, from a sub-block code stream included in the image macroblock, a quantized mode code stream value of the current decoded block.

The quantization mode code stream obtaining module 52 may further include: a quantization mode image decoding unit, configured to acquire and decode a quantization mode image of the current image from the image code stream; and a determining unit, configured to arrange the position of the current decoded block in the image A quantized mode stream value of the current decoded block is determined.

The quantized mode code stream obtaining module 52 may further include an image SE I message code stream obtaining module of the quantization mode, configured to obtain a quantized mode code stream value of the current image decoding block from the SEI message code stream of the image.

The quantization mode decoding module 53 may include a first quantization mode decoding module, configured to use the result of inverse transforming the quantization mode code stream value or the quantization mode code stream value as a quantization mode of the current decoding block.

The quantization mode decoding module 53 includes a second quantization mode decoding module for decoding the quantized mode code stream value or decoding the quantized mode code stream value and inversely transforming the function relationship to obtain a quantization mode of the current decoded block.

The quantization mode decoding module 53 may further include a quantization mode entropy decoding module, configured to perform entropy decoding on the quantized mode code stream value or perform entropy decoding and inverse function relationship on the quantized mode code stream value. After that, the quantization mode of the current decoded block is obtained.

The image decoder provided by the embodiment of the present invention does not need to perform a quantization mode decision algorithm, and can obtain the quantization mode of the current coding block directly by decoding, which reduces the computational burden and implementation cost of the decoder.

As shown in FIG. 13, a schematic diagram of an image coding and decoding system according to an embodiment of the present invention includes: an image encoder 61 and an image decoder 62.

The image encoder 61 includes: a quantization mode decision module 41, configured to determine a quantization mode of a current coding block in the input image; a scaling or quantization processing module 42, configured to perform scaling or quantization processing on the current coding block according to the quantization mode, to obtain The quantized mode encoding module 43 is configured to obtain the quantized mode code stream value according to the quantization mode of the current coding block, and the image encoding module 44 is configured to encode the quantized current coding block data to obtain the image code. And an image stream insertion module 45, configured to write the quantized mode code stream value into the image code stream.

The image decoder 62 includes: a parsing module 51, configured to parse the current decoded block data from the image code stream; and a quantization mode code stream obtaining module 52, configured to obtain a quantized mode stream value of the current decoded block from the image code stream; The quantization mode decoding module 53 is configured to obtain a quantization mode of the current decoding block according to the quantization mode code stream value, and use an inverse scaling or inverse quantization module 54 to inverse scale the current decoded block data by using the quantization mode or The dequantization process is performed to obtain the dequantized current decoded block data. The decoded image generating module 55 is configured to obtain the decoded image according to the dequantized current decoded block data.

The image coding and decoding system of the embodiment of the present invention may further include any of the image encoders described in the image encoder of the embodiment of the present invention and any of the image decoders described above in the image decoder of the embodiment of the present invention.

The image coding and decoding system provided by the embodiment of the present invention encodes the quantization mode of the current coding block and writes it into the image code stream, so that the quantization mode decision algorithm is not required to be performed at the decoder end, and the current coding can be obtained directly by decoding. The quantization mode of the block reduces the computational burden and implementation cost of the decoder; further, the user can customize the quantization mode decision method and the quantization mode decision As a result, it is possible to flexibly change the quantitative decision process and enrich the decision result.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The steps of the foregoing method embodiments are included, and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It is not limited thereto; although the embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or some of the technologies. The features are equivalent to the equivalents of the technical solutions of the embodiments of the embodiments of the present invention.

Claims

Rights request

A quantization mode coding method, comprising:

The quantized mode code stream value is written into the image code stream.

The quantization mode encoding method according to claim 1, wherein the obtaining the quantized mode stream value according to the quantization mode of the current coding block comprises: quantizing the quantization mode result of the current coding block or quantifying the current coding block The result of the mode transformation by the function relationship is used as the quantization mode code stream value.

The quantization mode coding method according to claim 1, wherein the obtaining the quantization mode code stream value according to the quantization mode of the current coding block comprises: quantizing the result of the quantization mode of the current coding block or quantifying the current coding block The pattern is encoded by the result of the function relationship transformation to obtain a quantized mode code stream value.

The quantization mode encoding method according to claim 3, wherein the performing the encoding comprises: performing encoding according to an entropy encoding method.

The quantization mode encoding method according to claim 4, wherein the entropy encoding method comprises: index coding, fixed length coding, run length coding, variable length coding, arithmetic coding, or any combination of the above methods.

The quantization mode encoding method according to any one of claims 1-5, wherein the writing the quantized mode code stream value to the image code stream comprises: writing the quantized mode code stream value to the current encoding in the image The macroblock code stream or the sub-block code stream included in the currently coded macroblock or the auxiliary enhanced information message stream of the current picture.

The quantization mode encoding method according to any one of claims 1-5, wherein the writing the quantized mode code stream value to the image code stream comprises: dividing the quantized mode code stream value according to the current coding block in the image The arrangement positions in the group are combined into a quantized mode image and encoded and written into the image code stream.

8. A quantization mode decoding method, comprising:

Obtaining a quantization mode code stream value of the current decoded block from the image code stream; A quantization mode of the current decoded block is obtained according to the quantized mode code stream value.

The quantization mode decoding method according to claim 8, wherein the obtaining the quantized mode stream value of the current decoded block from the image code stream comprises: sub-blocks included in the image macroblock code stream or the image macroblock The quantized mode code stream value of the current decoded block is obtained from the code stream or the auxiliary enhanced information message code stream of the image.

The method for decoding a quantization mode according to claim 8, wherein the obtaining the quantized mode stream value of the current decoded block from the image code stream comprises: acquiring a quantized mode image of the current image from the image code stream and decoding, And determining a quantization mode code stream value of the current decoded block according to an arrangement position of the current decoded block in the image.

The quantization mode decoding method according to any one of claims 8 to 10, wherein the obtaining, according to the quantization mode code stream value, the quantization mode of the current decoded block comprises: using the quantization mode code stream value Or the result of the inverse transform of the quantized mode code stream value by the function relationship is used as the quantization mode of the current decoded block.

The quantization mode decoding method according to any one of claims 8 to 10, wherein the obtaining a quantization mode of the current decoding block according to the quantization mode code stream value comprises: using the quantization mode code stream value After decoding or decoding the quantized mode code stream value and inversely transforming the function relationship, the quantization mode of the current decoded block is obtained.

The quantization mode decoding method according to claim 12, wherein the performing decoding comprises: performing decoding according to an entropy decoding method.

The quantization mode decoding method according to claim 13, wherein the entropy decoding method comprises: an index, a fixed length code decoding, a run length code decoding, a variable length code decoding, an arithmetic decoding, or any of the foregoing methods. combination.

15. A quantization mode encoder, comprising:

The quantization mode coder according to claim 15, wherein the quantization mode coding module comprises a first quantization mode coding module, configured to: pass a quantization mode result of a current coding block or a quantization mode of a current coding block The result of the function relationship transformation is used as the quantization mode code stream value.

The quantization mode coder according to claim 15, wherein the quantization mode coding module comprises a second quantization mode coding module, configured to: pass a quantization mode result of a current coding block or a quantization mode of a current coding block The result of the function relationship transformation is encoded to obtain a quantized mode code stream value.

The quantization mode encoder according to claim 17, wherein the second quantization mode encoding module comprises a quantization mode entropy encoding module, configured to use a quantization mode result of a current coding block or a quantization mode of a current coding block. The result of the function relationship transformation is entropy encoded to obtain a quantized mode code stream value.

The quantization mode encoder according to any one of claims 15 to 18, wherein the image code stream insertion module comprises:

An image macroblock code stream insertion module, configured to write the quantized mode code stream value into a currently coded macroblock code stream in the image;

Or an image macroblock sub-block code stream insertion module, configured to write the quantized mode code stream value into a sub-block code stream included in a currently coded macroblock in the image;

Or, the image assisted enhancement information message stream insertion module is configured to write the quantized mode code stream value into the auxiliary enhanced information message code stream of the image.

a quantization mode image encoding unit, configured to combine the quantized mode code stream values into a quantization mode image according to an arrangement position of the current coding block in the image and encode the image;

An insertion unit, configured to write the encoded quantized mode image into the image code stream.

21. A quantization mode decoder, comprising: a quantization mode code stream obtaining module, configured to obtain, from the image code stream, a quantized mode code stream value of the current decoded block;

The quantization mode decoder according to claim 21, wherein the quantization mode code stream acquisition module comprises:

a quantization mode macroblock code stream obtaining module, configured to obtain, from an image macroblock code stream, a quantization mode code stream value of a current decoding block;

Or a quantization mode macroblock sub-block code stream obtaining module, configured to obtain, from a sub-block code stream included in the image macroblock, a quantization mode code stream value of the current decoding block;

Or, the quantization mode image-assisted enhanced information message code stream obtaining module is configured to obtain a quantization mode code stream value of the current image coding block from the auxiliary enhancement information message code stream of the image.

The quantization mode decoder according to claim 21, wherein the quantization mode code stream acquisition module specifically includes:

a quantization mode image decoding unit, configured to acquire a quantization mode image of the current image from the image code stream and decode the image;

And a determining unit, configured to determine a quantization mode code stream value of the current decoded block according to an arrangement position of the current decoded block in the image.

The quantization mode decoder according to any one of claims 21 to 23, wherein the quantization mode decoding module includes a first quantization mode decoding module, configured to use the quantization mode code stream value or the quantization mode code. The result of the inverse transformation of the stream value through the function relationship is used as the quantization mode of the current decoded block.

The quantization mode decoder according to any one of claims 21 to 23, wherein the quantization mode decoding module includes a second quantization mode decoding module, configured to decode the quantized mode code stream value or After the quantization mode code stream value is decoded and the function relationship is inversely transformed, the quantization mode of the current decoded block is obtained.

The quantization mode decoder according to claim 25, wherein the second quantization mode decoding module comprises a quantization mode entropy decoding module, configured to entropy decode the quantization mode code stream value or to perform a quantization mode After the code stream value is subjected to entropy decoding and inverse function transformation, the quantization mode of the current decoded block is obtained.

27. A quantization mode codec system, comprising: a quantization mode encoder and a quantization mode decoder;

The quantization mode encoder includes:

28. An image encoding method, comprising:

Determining a quantization mode of a current coded block in the input image;

The quantized current coded block data is encoded to obtain an image code stream, and the quantized mode code stream value is written into the image code stream.

The image encoding method according to claim 28, wherein the determining a quantization mode of the current coding block in the input image comprises: a neighboring block coding information according to a current coding block, an externally input quantization mode decision method, and an external Input quantization mode or adjacent block coding information of the current coding block, quantization mode decision method of the external input, quantization mode of the external input Arbitrary combination of the three, the quantization mode of the current coding block is obtained.

The image encoding method according to claim 29, wherein the method of determining the quantization mode of the current coding block has the highest priority of the externally input quantization mode, and the external input quantization mode decision method has priority Secondly, the method for deciding according to the neighboring block coding information of the current coding block has the lowest priority; when determining the quantization mode of the current coding block, the quantization mode determined by the high priority decision method replaces the decision method with low priority Quantization mode.

The image encoding method according to claim 28, wherein the obtaining the quantized mode stream value according to the quantization mode of the current coding block comprises: determining a quantization mode result of the current coding block or a quantization mode of the current coding block The result of the function relationship transformation is used as the quantization mode code stream value.

The image encoding method according to claim 28, wherein the obtaining the quantized mode stream value according to the quantization mode of the current coding block comprises: determining a quantization mode result of the current coding block or a quantization mode of the current coding block The result of the function relationship transformation is encoded to obtain a quantized mode code stream value.

The image encoding method according to claim 32, wherein the performing the encoding comprises: encoding according to an entropy encoding method.

The image encoding method according to claim 33, wherein the entropy encoding method comprises: index encoding, fixed length encoding, run length encoding, variable length encoding, arithmetic encoding, or any combination of the above methods.

The image encoding method according to any one of claims 28 to 34, wherein the writing the quantized mode code stream value to the image code stream comprises: writing the quantized mode code stream value to the current coded image in the image The macroblock code stream or the sub-block code stream included in the currently coded macroblock, or the auxiliary enhanced information message stream of the current picture.

The image encoding method according to any one of claims 28 to 34, wherein the writing the quantized mode code stream value to the image code stream comprises: dividing the quantized mode code stream value into the image according to the current coding block. The arrangement positions are combined into a quantized mode image and encoded and written into the image code stream.

37. An image decoding method, comprising:

The image decoding method according to claim 37, wherein the parsing the current decoded block data corresponding to the quantized mode code stream value from the image code stream comprises: including from the image macroblock code stream or the image macroblock The sub-block code stream or the auxiliary enhancement information message stream of the image is parsed to obtain a quantization mode code stream value corresponding to the current decoded block data.

The image decoding method according to claim 37, wherein the parsing the current decoded block data corresponding to the quantized mode code stream value from the image code stream comprises: parsing the quantization mode of the current image from the image code stream The image is decoded and the current decoded block data corresponding to the quantized mode code stream value is determined according to the arrangement position of the current decoded block in the image.

The image decoding method according to any one of claims 37 to 39, wherein the obtaining a quantization mode of the current decoded block according to the quantized mode code stream value comprises: using the quantization mode code stream value or The quantized mode code stream value is inversely transformed by the function relationship as the quantization mode of the current decoded block.

The image decoding method according to any one of claims 37 to 39, wherein the obtaining a quantization mode of the current decoded block according to the quantization mode code stream value comprises: performing the quantization mode code stream value After decoding or decoding the quantized mode code stream value and inversely transforming the function relationship, the quantization mode of the current decoded block is obtained.

The image decoding method according to claim 41, wherein the performing decoding comprises: performing decoding according to an entropy decoding method.

43. The image decoding method according to claim 42, wherein the entropy decoding method comprises: an index, a fixed length code decoding, a run length code decoding, a variable length code decoding, an arithmetic decoding, or the like. Any combination of methods.

44. An image encoder, comprising:

And an image coding module, configured to encode the quantized current coded block data to obtain an image code stream; and the image code stream insertion module is configured to write the quantized mode code stream value into the image code stream.

The image encoder according to claim 44, wherein the quantization mode decision module comprises a neighboring block decision module, configured to determine a quantization of the current coded block according to neighboring block coding information of a current coding block. mode.

The image encoder according to claim 44, wherein the quantization mode decision module comprises an external decision module, configured to determine the quantization of the current coding block according to an externally input quantization mode decision method or a quantization mode. mode.

The image encoder according to claim 44, wherein the quantization mode decision module comprises:

And determining, according to the neighboring block decision module, a first-level quantization mode of the current coding block according to the neighboring block coding information of the current coding block;

An external decision module, configured to determine a second-level quantization mode or a third-level quantization mode of the current coding block according to an externally input quantization mode decision method or a quantization mode;

And an integrated decision module, configured to determine, according to the first-level quantization mode, the second-level quantization mode, and the third-level quantization mode of the current coding block, the quantization mode of the current coding block.

The image encoder according to any one of claims 44 to 47, wherein the quantization mode encoding module comprises a first quantization mode encoding module, configured to use a quantization mode result of the current coding block or a current coding block. The quantization mode is transformed by the function relationship as the quantization mode code stream Value.

The image encoder according to any one of claims 44 to 47, wherein the quantization mode encoding module comprises a second quantization mode encoding module, configured to use a quantization mode result of the current coding block or a current coding block. The quantization mode is encoded by the result of the function relationship transformation to obtain a quantized mode code stream value.

The image encoder according to claim 49, wherein the second quantization mode encoding module comprises a quantization mode entropy encoding module, configured to pass a quantization mode result of a current coding block or a quantization mode of a current coding block. The result of the function relationship transformation is entropy encoded to obtain a quantized mode code stream value.

The image encoder according to any one of claims 44 to 47, wherein the image stream insertion module comprises:

Or, the image assisted enhancement information message stream insertion module is configured to write the code stream value of the quantization mode into the auxiliary enhanced information message code stream of the image.

53. An image decoder, comprising:

a quantization mode code stream obtaining module, configured to obtain, from the image code stream, a quantized mode code stream value of the current decoded block; a quantization mode decoding module, configured to obtain, according to the quantized mode code stream value, a quantization mode of a current decoded block;

The image decoder according to claim 53, wherein the quantization mode code stream acquisition module comprises: a quantization mode macroblock or a sub-block code stream acquisition module, configured to be used in an image macroblock stream or an image. Obtaining a quantized mode code stream value of the current decoded block in the sub-block code stream included in the macro block; or, a quantization mode image-assisted enhanced information message code stream obtaining module, configured to obtain a current image decoding from the auxiliary enhanced information message code stream of the image The quantization mode code stream value of the block.

The image decoder according to claim 53, wherein the quantization mode code stream acquisition module specifically includes:

The image decoder according to any one of claims 53-55, wherein the quantization mode decoding module comprises a first quantization mode decoding module, configured to use the quantization mode code stream value or the quantization mode code stream. The result of the inverse transformation of the value is used as the quantization mode of the current decoded block.

The image decoder according to any one of claims 53-55, wherein the quantization mode decoding module comprises a second quantization mode decoding module, configured to decode or quantize the quantized mode code stream value. After the mode code stream value is decoded and the function relationship is inversely transformed, the quantization mode of the current decoded block is obtained.

The image decoder according to claim 57, wherein the second quantization mode decoding module comprises a quantization mode entropy decoding module, configured to entropy the quantized mode code stream value After decoding or entropy decoding the quantized mode stream value and inversely transforming the function relationship, a quantization mode of the current decoded block is obtained.

59. An image coding and decoding system, comprising: an image encoder and an image decoder; the image encoder includes: