KR100714853B1 - Unified Application System For Adaptive Loop Filtering And Post Filtering Of Moving Picture Coding System - Google Patents

Abstract

The present invention is composed of one integrated filtering module without separating the loop filtering block and the post filtering block in the video system, and controls the selector according to the loop filtering application or the post filtering application to transfer the result of the filtering to the memory for motion vector compensation. By storing the result before storing or filtering in the memory for motion vector compensation, the amount of the system is effectively reduced, and the use of unnecessary resources is eliminated, thereby providing efficiency in the utilization of the system.

Decoder, video compression system, loop filtering, post filtering, selector

Description

Unified Application System For Adaptive Loop Filtering And Post Filtering Of Moving Picture Coding System}

1 is a block diagram of an embodiment of an adaptive integrated application device of a loop filter and a post filter in a video system according to the present invention.

FIG. 2 is a diagram illustrating block boundaries to be filtered using an adaptive integrated application apparatus of a loop filter and a post filter in a video system according to the present invention.

3 is a graph illustrating the compatibility of quantization parameters for H.263 compression scheme processing and quantization parameters for H.264 compression scheme processing using an adaptive integrated application of a loop filter and a post filter in a video system according to the present invention. to be.

The present invention does not separate the loop filtering block and the post filtering block in a video system that supports loop filtering and post filtering at the same time. It is about the adaptive integrated application of loop filter and post filter in the system.

In the process of decoding a compressed video bit stream into a video in a video system, a loop filtering technique and a post filter technique are applied according to a video compression scheme.

For example, it is called "Mammoth codec" because it can compress 3 times more data than MPEG-2 (Moving Picture Coding Experts Group Phase 2), which is one of video compression standardization methods, and 2 times more than MPEG-4. With the coding rate of 2Mbps, the same picture quality as DVD can be obtained, and with the coding rate of 1Mbps, it is possible to obtain the same quality as the home VCR. H.264 / MPEG- is being applied to more and more applications including mobile phones and digital cameras. Loop filtering is applied to decode the bit stream compressed by the Moving Picture Coding Experts Group Phase 4 Advanced Video Coding (AVC) method.

In addition, the post-filtering technique is applied to decode the bit stream compressed by the MPEG-4 method, which is one of the H.263 or video compression standardization methods designed for low bit rate communication using the ITU-T standard.

In applying the filtering of different techniques in the decoding process according to the compression method of the image as described above, the former stores the image data filtered through the loop filter in the memory for motion compensation, and the latter is filtered. The previous reconstructed image data is stored in a memory for motion compensation.

Therefore, in order to simultaneously support the above two methods in a video system, a structure for applying loop filtering and a structure for applying post filtering exist independently.

Therefore, disadvantages arise in that resources of the post filtering block are wasted when loop filtering is used, and disadvantages are waste of resources of the loop filtering block when post filtering is used.

In addition, the waste of resources as described above results in an increase in the power used, resulting in an increase in the price of the system, thereby weakening the price competitiveness.

The present invention has been invented to solve the above problems, and the object of the present invention is to overcome the problem of waste of resources in the video system that supports loop filtering and post filtering at the same time, and effectively integrates loop filtering and post filtering. I did it.

In other words, the loop filtering block and the post filtering block are configured as one integrated filtering module. The selector is controlled according to the loop filtering application or the post filtering application, and the result of the filtering is stored in the memory for motion vector compensation. It is decided whether or not the result before filtering is to be stored in the motion vector compensation memory.

The present invention for achieving the above object is a decoder for extracting the motion vector and the discrete transform coefficients in the bit stream; An inverse quantizer for inverse quantizing a discrete transform coefficient applied by the decoder; An inverse transformer for inversely transforming a data signal to be inversely quantized; A filter for removing noise components included in the decoding process to improve the image quality of the displayed image; A selector for selecting an application of the filter under the control of an image processing processor; A memory for storing motion vector compensation for reconstructed data applied through a contact of a selector according to the application of the filter; A motion compensator for compensating a motion vector of the reconstructed image data stored in the memory according to the motion vector value extracted and applied by the decoder; And an adder for adding the image data compensated by the motion compensator and the image data reconstructed through the inverse quantization and inverse transformation and reconstructing the moving image data.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the adaptive integrated application apparatus of the loop filter and the post filter in the video system according to the present invention includes a decoder 101, an inverse quantizer 103, an inverse transformer 105, an adder 107, And a filter 109, a selector 111, a memory 113, and a motion compensator 115.

The decoder 101 decodes the bit stream in units of macro blocks that are compressed and applied to the image input from the image input means through preprocessing.

That is, if the bit stream corresponds to the motion vector, the motion vector is extracted and output. If the bit stream corresponds to the discrete transform coefficient, the discrete transform coefficient is extracted and output.

The inverse quantizer 103 performs inverse quantization on the discrete transform coefficients extracted and applied by the decoder 101 to restore the original data signal.

The inverse transformer 105 inversely converts the applied data signal by inverse quantization and restores the original image data.

The adder 107 adds the image data compensated by the motion compensator 115 and the image data reconstructed through the inverse quantization and inverse transformation to reconstruct the moving image data.

The filter 109 is composed of a filtering module in which loop filtering and post filtering are integrated. The filter 109 includes noise components included in the decoding process for improving image quality in displaying image data applied through the adder 107. After filtering and removing, images are displayed through display means (not shown).

The selector 111 selects a function of the filter 109 by selecting an internal contact by a control signal applied according to whether to apply a compressed image reconstructed by an image processing processor (not shown) by loop filtering or post filtering. give.

The selector 111 includes a loop filtering selection contact D-L and a post filtering selection contact D-P around an axis connected to the memory 113.

The memory 113 stores the reconstructed data applied through the contact point of the selector 111 for motion vector compensation according to the application of the filter 109 by an image processing processor (not shown).

The motion compensator 115 compensates the motion vector of the reconstructed image data stored in the memory 113 according to the motion vector value extracted from the bit stream through the decoder 101.

Referring to the operation of the adaptive integrated application device of the loop filter and the post filter in the video system according to the present invention including the functions as described above are as follows.

First, the application of loop filtering to process H.264 / MPEG-4 AVC, which is a 4x4 block-based compression method, will be described.

As the application of the filter 109 by the image processor (not shown) is selected by the loop filtering, the selector 111 is connected to the loop filtering selection contact D-L around an axis where the internal contact is connected to the memory 113.

As described above, in the state where the internal contact of the selector 111 is connected by an application of loop filtering, the decoder 101 performs a preprocessing on the image input from the image input means, and compresses and applies a bit stream in units of macro blocks. Decrypt

That is, if the bit stream corresponds to the motion vector, the motion vector is extracted and output to the motion compensator 115. If the bit stream corresponds to the discrete transform coefficient, the discrete transform coefficient is extracted and output to the inverse quantizer 103.

The inverse quantizer 103 performs inverse quantization on the discrete transform coefficients extracted and applied by the decoder 101 and then applies the inverse transformer 105 to the inverse transformer 105 to inversely transform the data signal into original image data. After reconstruction, loop filtering is performed through the filter 109 and stored in the memory 113 through the contact DL of the selector 111.

In this case, the motion compensator 115 compensates the motion vector according to the information extracted and applied to the decoder 101 with respect to the restored image data stored in the memory 113 and applies it to the adder 107.

Therefore, the motion vector is compensated for the reconstructed image data by the adder 107 and outputted as an image image through display means (not shown).

As the filter 109 is selected as the application of the loop filtering, the boundary block processed in the image data of the bit stream to be restored is shown in FIG. 2 as V0, V1, V2, V3, V4, V5, H0, H1, H2, Processing is performed for the areas of H3, H4, and H5.

At this time, the processed quantization parameter value has a value between 0 and 51.

On the other hand, when the application of the filter 109 is selected as the post filtering for the processing of the video compressed by 8 × 8 block-based H.263, MPEG-1, MPEG-2, MPEG-4, etc., not shown As the application of the filter 109 by the image processor is selected by post filtering, the selector 111 is connected to the post filtering selection contact DP around an axis where the internal contact is connected to the memory 113.

In this way, in the state where the internal contact of the selector 111 is connected by the application of post filtering, the decoder 101 performs a preprocessing on the image input from the image input means, and compresses and applies a bit stream in units of macro blocks. Decrypt

That is, if the bit stream corresponds to the motion vector, the motion vector is extracted and output to the motion compensator 115. If the bit stream corresponds to the discrete transform coefficient, the discrete transform coefficient is extracted and output to the inverse quantizer 103.

The inverse quantizer 103 performs inverse quantization on the discrete transform coefficients extracted and applied by the decoder 101 and then applies the inverse transformer 105 to the inverse transformer 105 to inversely transform the data signal into original image data. After reconstruction, the image data before filtering through the contact point DP of the selector 111 is stored in the memory 113.

At this time, the motion compensator 115 compensates the motion vector according to the information extracted and applied to the decoder 101 with respect to the reconstructed image data stored in the memory 113 and applies it to the adder 107.

Therefore, the motion vector is compensated for the reconstructed image data by the adder 107 and then filtered by the filter 109 to improve the image quality, and then output as an image image through display means (not shown).

As the filter 109 is selected as the application of the post filtering, the boundary block processed in the image data of the bit stream restored is processed for the regions of V0, V2, V4, H0, H2, and H4 in FIG.

In this case, the processed quantization parameter value has a value between 1 and 31.

In the application of the filter 109 as a loop filter or a post filter as described above, the quantization parameter value of the H.263 compression method in order to utilize a block made of a core as a loop filter that processes the H.264 compression method. Since is to be converted to a quantization parameter value of the appropriate H.264 compression scheme, it includes a quantization parameter transform block for this function, the application thereof has the relationship as shown in the graph of FIG.

In addition, for H.264 compression method, the boundary strength value can be obtained as recorded in the standard.However, information such as motion in different frames exists only in H.264 compression method. For the application, the boundary strength values must be obtained in a somewhat different way.

Therefore, a method of using a value selected by a user or giving a stronger filtering strength than an inter block when the intra block is applied is applied.

In the above description of a preferred embodiment of an adaptive integrated adaptive device of a loop filter and a post filter in a video compression system according to the present invention, the present invention is not limited thereto, but the claims and the detailed description of the invention and the accompanying drawings. Various modifications can be made within the scope of the invention, which also belongs to the scope of the present invention.

 As described above, the present invention uses a single filtering module that integrates loop filtering and post filtering in a video system that simultaneously supports loop filtering and post filtering, thereby effectively reducing the amount of system and using unnecessary resources. Excluded provides efficiency in the utilization of the system.

Claims (11)

A decoder for extracting motion vectors and discrete transform coefficients from the bit stream; An inverse quantizer for inversely quantizing the discrete transform coefficients applied by the decoder; An inverse transformer for inversely transforming a data signal to be inversely quantized; A filter configured to remove noise components included in the decoding process and improve the quality of the displayed image and include an independent module integrating loop filtering and post filtering; A selector for selecting an application of the filter under the control of an image processing processor; A memory for storing motion vector compensation for reconstructed data applied through a contact of a selector according to the application of the filter; A motion compensator for compensating a motion vector of the reconstructed image data stored in the memory according to the motion vector value extracted and applied by the decoder; And an adder for adding the image data compensated by the motion vector by the motion compensator and the image data reconstructed through the inverse quantization and inverse transformation and reconstructing the image data. The selector includes a loop filtering selection contact point (D-L) and a post filtering selection contact point (D-P) around an axis connected to a memory. The decoded data stored in the memory by the selector stores the data before filtering or the data filtered by the filter, When the filter is used as a loop filter by the selector, V0, V1, V2, V3, V4, V5, H0, among block boundary objects for compressed image processing of 4 × 4 block-based H.264 / MPEG-4 AVC. Process the regions of H1, H2, H3, H4, H5, When the filter is used as a post filter by the selector, V0, V2, V4, H0 among block boundary objects for compressed image processing of H.263. MPEG-1, MPEG-2, MPEG-4 based on 8x8 block. Process the area of, H2, H4, When the filter is used as a post filter by the selector, a quantum parameter converting apparatus is further included for processing the compressed image of H.263. MPEG-1, MPEG-2, MPEG-4 based on 8 × 8 block. When the filter is used as a post filter by the selector to process 8 × 8 block-based H.263.MPEG-1, MPEG-2, MPEG-4 compressed video, the boundary of the intra block is greater than or equal to the inter block. Adaptive integrated application of loop and post filters in video compression systems applying intensity values. delete delete delete The method of claim 1, And the output of the filter is an adaptive integrated application of a loop filter and a post filter in a video compression system used for display purposes. delete delete delete delete delete delete

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