KR20060085150A - Method and apparatus for encoding/decoding video signal using prediction information of intra-mode macro blocks of base layer - Google Patents

Abstract

The present invention relates to a method and apparatus for encoding a video signal using prediction information of an intra mode block of an auxiliary layer and decoding the encoded video data accordingly, wherein the video signal is encoded in a scalable MCTF scheme. Outputs the bit stream of the enhanced layer and simultaneously encodes the video signal in a predetermined manner to output the bit stream of the base layer, and when encoding in the MCTF method, an internal mode included in the bit stream of the base layer. On the basis of the prediction information of the corresponding block coded by < RTI ID = 0.0 >, < / RTI >

MCTF, encoding, layer, internal mode, prediction mode, prediction direction, segmentation, inter-layer, intra mode

Description

Method and apparatus for encoding / decoding video signal using prediction information of internal mode block of base layer {method and apparatus for encoding / decoding video signal using prediction information of intra-mode macro blocks of base layer}

FIG. 1 illustrates an example of a conventional process of making blocks of the same position in an enlarged frame of a base layer at the same time into a prediction image of an enhanced layer.

2 is a block diagram of a video signal encoding apparatus to which a video signal coding method according to the present invention is applied.

FIG. 3 illustrates a configuration for performing image estimation / prediction and update operations in the MCTF encoder of FIG.

4A to 4C illustrate examples of a process of coding a macroblock of an enhanced layer in an internal mode using prediction information of an internal mode block of a base layer, according to an embodiment of the present invention.

5A to 5C illustrate examples of a process of coding a macroblock of an enhanced layer in an internal mode by using prediction information of an internal mode block of a base layer, according to another embodiment of the present invention.

6 is a block diagram of an apparatus for decoding a data stream encoded by the apparatus of FIG. 2;

FIG. 7 illustrates a configuration for performing reverse prediction and reverse update operations in the MCTF decoder of FIG. 6.

<Description of the symbols for the main parts of the drawings>

100: MCTF encoder 102: estimator / predictor

103: updater 105, 240: base layer decoder

110: texture encoder 120: motion coding unit

130: eat 150: base layer encoder

200: demuxer 210: texture decoder

220: motion decoding unit 230: MCTF decoder

231: reverse updater 232: reverse predictor

234: array 235: motion vector decoder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to scalable encoding and decoding of video signals. In particular, the present invention relates to an intra mode of a base layer during scalable coding using a motion compensated temporal filter (MCTF) scheme. A method and apparatus for encoding a video signal using prediction information of a block and decoding the encoded video data accordingly.

For digital video signals transmitted and received wirelessly by mobile phones and laptops and mobile TVs and hand PCs, which are widely used in the future, it is difficult to allocate a wide band such as bandwidth for TV signals. Therefore, the standard to be used for the image compression method for such a mobile portable device should be higher the compression efficiency of the video signal.

In addition, such a mobile portable device has a variety of capabilities that can be processed or presented. Therefore, the compressed image must be prepared in such a variety that the same image source should be provided for the combined values of various variables such as transmission frames per second, resolution, and bits per pixel. This means a lot of burden on the content provider.

For this reason, the content provider has high-speed bitrate compressed image data for one image source, decodes the original image when requested by the mobile device, and then fits the image processing capability of the requested device. Provides by performing a process of properly encoding the image data. However, such a method requires a transcoding (decoding + encoding) process, and thus a time delay occurs in providing a video requested by the mobile device. Transcoding also requires complex hardware devices and algorithms as target encodings vary.

Scalable Video Codec (SVC) has been proposed to solve such disadvantages. This method encodes a video signal and encodes it at the highest quality, but enables a low-quality video representation by using a decoded partial sequence of the resulting picture sequence (a sequence of intermittently selected frames throughout the sequence). That's the way. The Motion Compensated Temporal Filter (MCTF) method is an encoding method proposed for use in the scalable image codec as described above.

However, as mentioned above, a picture sequence encoded by the scalable MCTF is capable of expressing a low quality image even by receiving and processing only a partial sequence. However, when the bitrate is low, the image quality is greatly deteriorated. In order to solve this problem, a separate auxiliary picture sequence for a low data rate, for example, a small picture and a low frame rate per frame may be provided. The auxiliary sequence is called a base layer, and the main picture sequence is called an enhanced (or enhanced) layer. However, since the base layer and the enhanced layer encode the same video signal source, redundancy information exists in the video signals of both layers.

Therefore, in order to increase the coding rate of the enhanced layer encoded by the MCTF method, the image frame of the enhanced layer is simultaneously made based on an arbitrary image frame of the base layer as a prediction image. Figure 1 schematically shows the process for this.

Referring to the process illustrated in FIG. 1, a predetermined number of macroblocks of the base layer are configured into one screen, and the screen is upsampled to enlarge the same as the size of the image frame of the enhanced layer (S10). In the enlarged screen B100, at the same position as the macro block EM10 in the frame E100 of the enhanced layer, which is the same time as the screen of the enlarged base layer, at which the current prediction image is to be made. If the macro block BM10 is coded in the intra mode, a prediction operation is performed on the macroblock EM10 of the enhanced layer based on the macroblock BM10 (S11). .

That is, the macroblock BM10 of the internal mode of the base layer is restored to the original block image using pixel values of neighboring adjacent lines, and then the difference value (or error value) with the restored pixel value, that is, the register The dual is encoded in the macro block EM10 of the enhanced layer.

However, as described above, when the original image of the inner mode block of the base layer is encoded, when an arbitrary frame of the enhanced layer is encoded, the block of the inner mode of the base layer to be used for the image block within the frame is selected. According to the prediction information, the original image must first be restored. However, this requires considerable hardware complexity.

The present invention has been made to solve the above problems, and an object thereof is to encode an image in a scalable manner, and to recover an image signal using prediction information of the block without reconstructing the image of the inner mode block of the base layer. The present invention provides a method and apparatus for coding a prediction image.

Another object of the present invention is to provide a method and apparatus for decoding a data stream having an encoded block using prediction information of an inner mode block of a base layer.

In order to achieve the above object, the present invention encodes a video signal in a scalable MCTF scheme to output a bit stream of a first layer and simultaneously encodes the video signal in a predetermined manner to generate a bit stream of a second layer. Output to the video block included in an arbitrary frame of the video signal based on the prediction information of the first block coded in the internal mode included in the bit stream of the second layer when encoding in the MCTF scheme. And coding in the internal mode using the adjacent pixel of the video block.

In one embodiment according to the present invention, the prediction information is divided into information on a prediction mode and a direction of prediction (DoP).

In one embodiment according to the present invention, the frame of the second layer is encoded into a small picture frame smaller than the screen size of the frame of the first layer.

According to an embodiment of the present invention, the image block is divided into a plurality of cells based on the prediction mode of the first block, and for each predetermined number of groups of the divided cells, corresponding to the group, within the first block. The prediction direction of the partial region is equally applied to each cell in the group, and the difference of each pixel value of the corresponding cell is coded.

In another embodiment according to the present invention, the image block is divided into a plurality of cells by a size obtained by multiplying a screen size ratio of the first layer to the second layer by a size specified in the prediction mode of the first block. For the divided cell, the pixel direction difference of each cell of the corresponding cell is coded by applying the prediction direction of the partial region in the first block corresponding to the cell.

In another embodiment according to the present invention, the difference value between the error data obtained based on the prediction information of the first block and the error data of the first block or a partial region of the image block is coded into the image block. do.

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

2 is a block diagram of a video signal encoding apparatus to which a scalable coding method of a video signal according to the present invention is applied.

The video signal encoding apparatus of FIG. 2 is an MCTF encoder 100 for encoding an input video signal to each macro block unit by an MCTF scheme and generating appropriate management information according to the present invention. The texture coding unit 110 for converting the information of the macro block into the compressed bit string, and the bit streams compressed by the specified method of motion vectors of the image blocks obtained by the MCTF encoder 100. Motion coding unit 120 to encode the input video signal in a specified manner, for example MPEG 1, 2, or 4, or H.261, H.263 or H.264 method to encode a small picture, for example A base layer (BL) encoder 150 for generating a sequence of pictures having a size of 25% of the original size, output data of the texture coding unit 110, a small picture sequence of the BL encoder 150, and the motion coding unit ( Output vector data of 120) It is configured to include an encapsulator 130 that encapsulates the format and then muxes and outputs each other in a predetermined transmission format.

The MCTF encoder 100 performs a motion estimation and prediction operation on a macroblock in an image frame, and adds an update to the macroblock with respect to an image difference with a macroblock in an adjacent frame. (update) Perform the operation.

The MCTF encoder 100 separates an input video frame sequence into, for example, odd and even frames, and then performs an estimation / prediction and update operation on an aberration, for example, an L frame (updating one GOP (Group of Pictures). The operation of FIG. 3 shows a configuration related to the estimation / prediction and update operation of one step (also referred to as 'MCTF level').

The configuration of FIG. 3 is a base layer (BL) decoder 105 for extracting encoding information such as a frame rate and a mode of a macro block from a base layer stream of an encoded small picture sequence of the base layer encoder 150. ), Before or after adjacent frames, through motion estimation, find the reference block for each macroblock in the frame to be coded as residual data, and find the image difference from the actual macroblock (each corresponding pixel). An estimator / predictor 102 that codes the difference value of &lt; RTI ID = 0.0 &gt;) &lt; / RTI &gt; and directly calculates a motion vector for the reference block or uses information of each macroblock extracted by the BL decoder 105, the motion estimation. For a macro block in which the reference block is found by, the update operation is performed by normalizing the obtained image difference and then adding it to the corresponding reference block. Performing includes an updater (103). An operation performed by the updater 103 is called an 'U' operation and a frame generated by the 'U' operation is called an 'L' frame.

The estimator / predictor 102 and the updater 103 of FIG. 3 may simultaneously perform parallel operations on a plurality of slices in which one frame is divided, not an image frame, and the estimator / predictor 102 The frame (or slice) with the image difference made by is called an 'H' frame (slice). The data of the difference value in the 'H' frame (slice) reflects the high frequency component of the video signal. The term 'frame' used in the following examples is used to include the meaning of the slice, of course, if the equivalent of technology is maintained even if replaced by the slice.

The estimator / predictor 102 divides each of the input image frames (or L frames obtained in the previous step) into macro-blocks having a predetermined size, and then images of each divided macro blocks. The process of finding the block having the highest correlation with the temporally adjacent front / rear frame, making a prediction image of the macro block based on this, and obtaining a motion vector. If a block having a correlation greater than or equal to an appropriate threshold value is not found, the encoding information provided from the BL decoder 105 does not have information about a frame at the same time, or a corresponding block within the frame (the relative position in the frame is the same). If the block) is not an intra mode, the current macro block is coded into the internal mode using adjacent pixel values. This operation is called a 'P' operation, and a frame generated by the 'P' operation is an 'H' frame. This process is a well-known technique, and thus a detailed description thereof is not directly related to the present invention, and thus it is omitted. According to the present invention, motion estimation is not performed using prediction information of internal mode blocks of a base layer frame at the same time. A detailed description will be given with reference to the exemplary process of FIGS. 4A to 4C and 5A to 5C to make a macroblock into a predictive image, that is, residual data.

First, one embodiment of the present invention illustrated in FIGS. 4A and 4C will be described.

If it is determined from the encoding information provided from the BL decoder 105 that the corresponding block in the frame at the same time is the internal mode, the estimator / predictor 102 predicts the prediction mode and the prediction direction (DoP) of the corresponding block. Check. Here, the corresponding block means a block having the same relative position on the frame as the current macro block of the enhanced layer when the screen size of the enhanced layer and the base layer is the same, and an enhanced layer that is larger than the screen size of the base layer. Means a block having an image area covering the current macroblock of the enhanced layer when the frame of the base layer is scaled to the frame size of the enhanced layer.

In one embodiment of the present invention, the screen size of the frame encoded by the MCTF encoder 100 is four times the screen size of the frame encoded by the BL encoder 150, and has different screen sizes.

In one embodiment according to the present invention, the base layer encoder 150 uses an internal mode type of intra 4x4, intra 8x8 and intra 16x16, that is, a prediction mode shown in FIGS. 4A to 4C for the internal mode, respectively. Nine types are used for the intra 4x4 and intra 8x8 types, and four DoPs (for example, the direction of the arrow in the figure) are used for the intra 16x16 type.

After estimating the prediction mode, the estimation / predictor 102 divides the current macroblock 401 into cells according to the prediction mode of the base layer. That is, if the prediction mode of the base layer is a type of intra 4x4 as shown in FIG. 4A, the current macro block 401 is divided into cells having a size of 4x4. If the mode of intra 8x8 as shown in FIG. 4B, the current macro, If the block 401 is divided into cells having a size of 8x8, and if the mode is intra 16x16 as shown in Fig. 4c, the current macro block 401 is divided into cells having a size of 16x16, each cell Is coded using DoP information of the corresponding macroblock of the base layer.

However, in one embodiment according to the present invention, the macroblock 401 of the enhanced layer has pixels corresponding to the image of the corresponding macroblock 1/4 of the base layer, and the current macroblock 401 is the base layer. Since the cell is partitioned into cells in the same manner as the prediction mode of the corresponding macroblock in, the number of DoP information to be used is more than four times, that is, used in the corresponding block. That is, in the fourth partial block 402 of the macroblock of the base layer corresponding to the current macroblock 401, four DoP information is included in the intra 4x4 type of FIG. 4A and 1 in the intra 8x8 type of FIG. 4B. DoP information is included. For each case, the number of cells of the current macroblock divided is 16 and 4, and the number of divided cells is larger than the number of available DoPs. As many as.

Accordingly, the estimator / predictor 102 groups four of the divided cells of the current macroblock 401 to equal the DoP of the region corresponding to each cell group in the quarter subblock 402. Internal mode coding. For example, in the example of FIG. 4A, each of the four cells of the upper left cell group 401a uses the same DoP information of the upper left cell 402a of the quarter-part block 402 in the corresponding block, respectively. In the example of FIG. 4B, each of the four cells in the cell group 401a (which is the same as the size of the macro block 401) is a 1/4 partial block of the base layer corresponding to the cell group 401a. Inner mode coded using the DoP information of 402 in the same manner. The same applies to other cell groups or other macro blocks of the macro block.

Intra-mode coding selects the pixel values of adjacent left and / or top pixel lines according to a given DoP and codes the difference value (residual) of each pixel based on the average or A difference value (residual) with a value obtained by properly interpolating pixel values in two lines according to DoP is coded.

On the other hand, if the corresponding block of the base layer is coded with intra 16x16 as in the example of FIG. 4C, that is, if one macroblock of 16x16 is coded according to one DoP 41, the estimation / predictor 102 ) Uses not only the current macro block 401 but also three macro blocks having the same corresponding block 41 in contact with the macro block 401 using the DoP 41 of the corresponding block 410 in the same manner. Each coded internally.

In another embodiment according to the present invention, the estimator / predictor 102 is based on the prediction mode for the corresponding block of the current macroblock and the current macroblock based on the screen size ratio of the frame coded by the frame to the base layer. Divide 401 into cells.

Under the condition that the screen size of the enhanced layer frame is four times that of the base layer frame, if the inner mode block of the base layer is an intra 4x4 mode as shown in FIG. 5A, the current macroblock 501 corresponds to four times that of the mode. In the case of intra 8x8 mode, as shown in FIG. 5B, the size corresponding to 4 times of the mode is the size of the current macro block 501, and thus the data is not divided. The same applies to the case of FIG. 5C in which the internal mode type of the corresponding block of the current macro block is intra 16x16.

When the macroblock is divided according to the present embodiment, as illustrated in FIG. 5A, since each divided cell corresponds one-to-one with DoP information of the 4x4 subregion of the corresponding block, the estimator / predictor 102 is divided. Each cell of the macroblock 501 is internally coded using DoP information of a 4x4 region corresponding to each other.

However, if a mode having a larger size than an internal coded mode is used in an arbitrary macro block of the base layer, for example, when the base layer uses intra 8x8, the enhanced layer uses intra 16x16, which is higher than that. In this case, the same DoP cannot be used. For example, as illustrated in FIG. 5B, a corresponding block of the base layer is coded in an intra 8x8 mode, and a quarter partial block 502 in the corresponding block corresponding to the current macro block 501 is a diagonal DoP 52. In this case, the current macroblock 501 should use diagonal DoP in intra 16x16 mode, but the diagonal DoP is not defined in four DoPs of the intra 16x16 mode and cannot be used.

Accordingly, when the DoP information of the corresponding block is not available, the estimator / predictor 102 may use the pixel values in two adjacent lines and / or the current macro block 501 regardless of the direction as shown in FIG. Or DC coding or plane coding based on the average of a fixed value, e.g., 128.

When the corresponding block is coded in the intra 16x16 mode as shown in FIG. 5C, the current macroblock 501 cannot be divided, and three adjacent blocks including the current macroblock 501 are identical to the corresponding block 510. Therefore, internal coding is performed by using one DoP 53 of the corresponding block 510 in common for four macro blocks. This is the same as the case of FIG. 4C.

After the internal mode coding as described above, the estimator / predictor 102 records mode information indicating that the code is coded using the DoP of the corresponding block of the base layer in the header information of the macro block, for example, in the block mode. The mode information at this time is information that is distinguished from information indicating the internal mode coded using the neighboring pixel of the enhanced layer without using the prediction information of the internal mode block of the base layer.

In another embodiment according to the present invention, after temporarily storing an internal coded residual block in the same manner as in FIGS. 4A to 4C or 5A to 5C, the corresponding block of the temporary block and the base layer is stored. Alternatively, a difference value of each pixel with a partial region of the corresponding block may be coded in the macroblock. That is, the difference between the respective internal mode coded error data is coded. To this end, the BL decoder 105 also provides encoded image frames in addition to extracting encoding information from the base layer stream. When the screen sizes of the enhanced layer and the base layer are different, the frame size of the decoded base layer is enlarged by upsampling and provided to the estimator / predictor 102 according to the ratio.

The data streams encoded by the method described so far are transmitted in whole or in part (depending on the channel capacity, for example) or via the recording medium, to the decoding device by wire or wirelessly, and the decoding device is then adapted according to the method described later. The video signal of the enhanced layer and / or the base layer is restored.

6 is a block diagram of an apparatus for decoding a data stream encoded by the apparatus of FIG. The decoding apparatus of FIG. 6 includes a demux 200 that separates a compressed motion vector stream and a compressed macro block information stream from a received data stream, and texture decoding to restore the compressed macro block information stream to an original uncompressed state. A unit 210, a motion decoding unit 220 for restoring a compressed motion vector stream to an original uncompressed state, an MCTF for inversely converting a decompressed macroblock information stream and a motion vector stream into an original video signal according to an MCTF method. The decoder 230 includes a base layer decoder 240 for decoding the base layer stream by a predetermined method, for example, MPEG4 or H.264. The BL decoder 240 decodes the input base layer stream and provides header information in the stream to the MCTF decoder 230 to encode encoding information of the base layer, for example, prediction information of an internal mode block. Make it available.

The MCTF decoder 230 includes the configuration of FIG. 7 for recovering an original frame sequence from an input stream.

The MCTF decoder 230 of FIG. 7 is configured to restore the H and L frame sequences of the MCTF level N to the L frame sequences of the level N-1. 7 shows an inverse updater 231 which subtracts a difference value of each pixel of an input H frame from an input L frame, an L frame having an image difference of the H frame subtracted, and an L having an original image using the H frame. Inverse predictor 232 for reconstructing a frame, and a motion vector decoder 235 for decoding an input motion vector stream and providing motion vector information of each macro block in an H frame to inverse predictors 232 of each stage. And an arranger 234 interpolating the L frames completed by the inverse predictor 232 between the output L frames of the inverse updater 231 to form a sequence of L frames in a normal order.

The L frame output by the arranger 234 becomes the L frame sequence 701 of level N-1, which is the inverse updater and inverse predictor of the next stage together with the input H frame sequence 702 of level N-1. It is reconstructed back to the L frame sequence by, and this process is performed by the MCTF level at the time of encoding to restore the original video frame sequence.

The recovery process of the H frame to the L frame at level N will be described in more detail with reference to the present invention. First, the inverse updater 231, for any L frame, converts a block in the frame into a reference block. Then, an error value of a macroblock in every H frame for which the image difference is obtained is subtracted from the corresponding block of the L frame.

The inverse predictor 232 is provided from the motion vector decoder 235 except for a macro block indicating that a header is internally coded using prediction information of a corresponding block of a base layer in one H frame. Based on the motion vector information, the macro block is restored to the original pixel value according to a known method.

If a macroblock that is internally coded using the prediction information of the corresponding block of the base layer and indicated by the header information thereof is used to restore the original image, the corresponding block of the base layer provided from the BL decoder 240 may be used. The prediction mode and the DoP information are checked first, and accordingly, original pixel values of the current macroblock coded in the internal mode are restored.

First, in the case of the embodiment of FIGS. 4A to 4C using DoP by dividing a cell into the same size as the prediction mode of the corresponding block in the inner mode of the base layer, the inverse predictor 232 may also use the prediction mode (intra 4x4 or the same) of the corresponding block. intra 8x8), the current macroblock is divided into cells in the same mode, and the DoP information of the corresponding block of the base layer is overlapped. For example, if the screen size ratio is 4, the overlap is applied four times to each of the four adjacent divided cells. The original pixel value of the corresponding cell is obtained, and if the prediction mode cannot be divided, that is, intra 16x16 (in case of FIG. 4C), the original pixel value of the current macro block is restored using the DoP of the corresponding block as it is.

The method of restoring the original pixel value using the DoP of the corresponding block includes obtaining a reference value applied to each pixel according to the corresponding DoP from the original pixel value of the neighboring macroblock or the cell previously restored, and then The current difference value is added to restore the original pixel value. In some cases, even when the macroblock adjacent to the current macroblock is in the inter-frame mode, the pixel value of the restored, i.e. decoded pixel value of the line adjacent to it may not be replaced by 128, but may be used to obtain the reference value. have. Since the preceding three blocks (left, top, and top left blocks) facing the current macro block are recovered before the current block in decoding order, there is no problem in using the original pixel values even in the inter-frame mode.

In the case of the embodiments of FIGS. 5A to 5C using DoP by dividing a cell into a mode of multiplying the size of the prediction mode of the corresponding block of the base layer by a screen size ratio, for example, 4, the inverse predictor 232 may be configured as the corresponding block. If the prediction mode is intra 4x4, it is divided into 8x8 cells, and the original pixel values of the corresponding cells are obtained by applying DoP information of 4x4 areas corresponding to each other in the corresponding block one-to-one (in case of FIG. 5A), and cannot be divided. In the prediction mode, i.e., intra 8x8 and intra 16x16 (in FIGS. 5B and 5C), the DoP of the corresponding block is used as it is to restore the original pixel value of the current macroblock. However, since the higher mode of the prediction mode applied to the block of the base layer is applied to the block of the enhanced layer, as shown in FIG. 5B, a DoP applied to the block of the base layer may not be applied to the current macro block. have. In this case, the inverse predictor 232 restores the original pixel value by performing a reverse operation of a predetermined method, for example, DC or plane prediction.

In an embodiment in which a difference between error data is coded for a block of an enhanced layer using prediction information of an inner mode block of the base layer, first, each pixel value of the current macro block is assigned to the corresponding block or the corresponding block of the base layer. After the corresponding pixel values of the partial region are added, the above-described operation of restoring the original pixel values is performed by using the prediction information of the corresponding block. To this end, the BL decoder 240 also provides the base layer frame before decoding to the MCTF decoder 230. If the screen sizes of the enhanced layer and the base layer are different, the frame of the base layer is enlarged according to the ratio. Will be provided.

For one H frame, it is performed in parallel in a predetermined unit, for example, a slice unit, so that all macro blocks in the frame have the original image, and then all of them are combined to form one complete image frame. do.

According to this method, the data stream encoded by the MCTF method using the prediction information of the inner mode block of the base layer is recovered to the complete image frame sequence. The above-described decoding apparatus may be mounted in a mobile communication terminal or the like or in an apparatus for reproducing a recording medium.

It is to be understood that the present invention is not limited to the above-described exemplary preferred embodiments, but may be embodied in various ways without departing from the spirit and scope of the present invention. If you grow up, you can easily understand. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

As described above, in the MCTF encoding, if the internal mode block is made using encoding information of the base layer provided for the low performance decoder in addition to the frame of the enhanced layer, the hardware complexity of the encoding apparatus may be reduced.

Claims (40)

An apparatus for encoding an input video signal, A first encoder for encoding the video signal in a scalable first manner to output a bit stream of a first layer; And a second encoder configured to output the bit stream of the second layer by encoding the video signal in a designated second method. The first encoder, Based on the prediction information of the first block coded in the internal mode included in the encoding information extracted from the bit stream of the second layer, the video block included in an arbitrary frame of the video signal is And means for coding in an internal mode using adjacent pixels. The method of claim 1, And the first block is a block co-located with the video block or a block including an area at the same position in a frame of the second layer simultaneously with the arbitrary frame. The method of claim 1, The prediction information, characterized in that it comprises information about the prediction mode and the prediction direction. The method of claim 3, wherein And the prediction mode is one selected from intra 4x4, intra 8x8, and intra 16x16. The method of claim 3, wherein The means divides the video block into a plurality of cells based on the prediction mode, and for each of a predetermined number of groups of divided cells, predicts the prediction direction of the partial region in the first block corresponding to the group within the group. And applying the same to each cell to code the difference in each pixel value of the corresponding cell. The method of claim 3, wherein The means divides the image block into a plurality of cells by a size multiplied by a screen size ratio of the first layer to the second layer, and a size corresponding to the cell specified in the prediction mode. And coding the pixel value difference of the corresponding cell by applying the prediction direction of the partial region in the first block. The method of claim 3, wherein The means, when it is not possible to divide the image block based on the prediction mode, applies the prediction direction for the partial region of the first block or the first block to the entire image block and codes each pixel value difference. Device characterized in that. The method of claim 7, wherein The means may internally code the image block by applying DC prediction or plane prediction when the prediction direction for the partial region of the first block is a prediction direction that cannot be applied to the entire image block. . The method of claim 1, And the means is further configured to include, in the header information of the image block, information indicating that the image block is internally coded using the prediction information of the corresponding block of the second layer. The method of claim 1, The decoder further provides an encoded video frame of the second layer to the first encoder, And the means for coding the image block with the difference value between the error data obtained based on the prediction information of the first block and the error data of the first block or a partial region thereof. . In the method for encoding an input video signal, Outputting a bit stream of a first layer by encoding the video signal in a scalable first manner; And encoding the video signal in a designated second manner to output a bit stream of a second layer. The encoding in the first method may include: Based on the prediction information of the first block coded in the internal mode included in the bit stream of the second layer, a video block included in an arbitrary frame of the video signal is used for pixels adjacent to the video block. And coding in the internal mode. The method of claim 11, And the first block is a block co-located with the video block or a block including an area in the same position in a frame of the second layer simultaneously with the arbitrary frame. The method of claim 11, The prediction information includes information on a prediction mode and a prediction direction. The method of claim 13, The prediction mode is one selected from intra 4x4, intra 8x8 and intra 16x16. The method of claim 13, The process divides the image block into a plurality of cells based on the prediction mode, and for each predetermined number of groups of divided cells, predicts the prediction direction of the partial region in the first block corresponding to the group within the group. Applying the same to each cell and coding the difference of each pixel value of the corresponding cell. The method of claim 13, The process may be performed by dividing the image block into a plurality of cells by multiplying a screen size ratio of the first layer to the second layer by a size specified in the prediction mode, and corresponding to the cell for each divided cell. And coding the pixel value difference of the corresponding cell by applying the prediction direction of the partial region in the first block. The method of claim 13, In the process, when the image block cannot be divided based on the prediction mode, the pixel value difference is coded by applying a prediction direction for the first block or a partial region of the first block to the entire image block. Characterized in that. The method of claim 17, The process may include internally coding the image block by applying DC prediction or plane prediction when the prediction direction for the partial region of the first block is a prediction direction that cannot be applied to the entire image block. . The method of claim 11, The encoding by the first method may further include including, in the header information of the video block, information indicating that the video block is internally encoded using the prediction information of the corresponding block of the second layer. Characterized in that the method. The method of claim 11, The process may include encoding, on the image block, a difference value between the error data obtained based on the prediction information of the first block and the error data of the first block or a partial region thereof. . An apparatus for receiving and decoding a bit stream of a first layer including a frame having a pixel having a difference value into a video signal, A first decoder which decodes the bit stream of the first layer in a scalable first manner and restores the bit stream of the first layer into image frames having an original image; Receiving a bit stream of a second layer, extracting encoding information from the bit stream, and providing a second decoder to the first decoder, The first decoder, Based on the prediction information of the first block coded in the internal mode included in the encoding information, the neighboring pixel of the target block is used for the target block included in any frame in the bit stream of the first layer. And means for restoring the pixel of the difference value of the target block to the original pixel value. The method of claim 21, And the first block is a block co-located with the video block or a block including an area at the same position in a frame of the second layer simultaneously with the arbitrary frame. The method of claim 21, The prediction information, the device characterized in that it comprises information about the prediction mode and the prediction direction. The method of claim 23, wherein And the prediction mode is one selected from intra 4x4, intra 8x8, and intra 16x16. The method of claim 23, wherein The means divides the target block into a plurality of cells based on the prediction mode, and for each predetermined number of groups of divided cells, predicts the prediction direction of the partial region in the first block corresponding to the group within the group. And applying the same to each cell to restore the pixel of the difference value of the corresponding cell to the original pixel value. The method of claim 23, wherein The means divides the target block into a plurality of cells in a size multiplied by the screen size ratio of the first layer to the second layer, and corresponding to the cell for each divided cell. And restoring the pixel of the difference value of the corresponding cell to the original pixel value by applying the prediction direction of the partial region in the first block. The method of claim 23, wherein The means, when it is not possible to divide the target block based on the prediction mode, applies the prediction direction for the partial region of the first block or the first block to the entire target block and applies the pixel of the difference value of the block. Recovering the original pixel values to the original pixel values. The method of claim 27, If the prediction direction for the partial region of the first block is a prediction direction that cannot be applied to the entire target block, the means performs reverse DC prediction or plane prediction to invert the pixel of the difference value of the target block. And restore to a pixel value of. The method of claim 21, The means, when instructing that the header information of the target block is internally coded using the prediction information of the corresponding block of the second layer, using the prediction information of the first block, And restoring the pixel value. The method of claim 21, The means adds data of the first block or a partial region thereof to data in the target block, and then adds the added target block using adjacent pixels of the target block based on prediction information of the first block. And restore the original pixel values. A method of receiving a bit stream of a first layer including a frame having pixels of difference values and decoding the same into a video signal, the method comprising: Restoring and outputting the image stream having the original image by decoding the bit stream of the first layer in a scalable first manner using encoding information extracted from the input bit stream of the second layer. It's done, The restoration output step, Based on the prediction information of the first block coded in the internal mode included in the encoding information, the neighboring pixel of the target block is used for the target block included in any frame in the bit stream of the first layer. Restoring the pixel of the difference value of the target block to the original pixel value. The method of claim 31, wherein And the first block is a block co-located with the video block or a block including an area in the same position in a frame of the second layer simultaneously with the arbitrary frame. The method of claim 31, wherein The prediction information, characterized in that it comprises information about the prediction mode and the prediction direction. The method of claim 33, The prediction mode is one selected from intra 4x4, intra 8x8 and intra 16x16. The method of claim 33, The process divides the target block into a plurality of cells based on the prediction mode, and for each predetermined number of groups of divided cells, predicts the prediction direction of the partial region in the first block corresponding to the group within the group. Applying the same to each cell to restore the pixel of the difference value of the corresponding cell to the original pixel value. The method of claim 33, The process may be performed by dividing the target block into a plurality of cells by multiplying a screen size ratio of the first layer to the second layer by a size specified in the prediction mode, and corresponding to the cell for each divided cell. And applying the prediction direction of the partial region in the first block to restore the pixel of the difference value of the corresponding cell to the original pixel value. The method of claim 33, In the above process, when the target block cannot be divided based on the prediction mode, the prediction direction for the partial region of the first block or the first block is applied to the entire block, and the pixel of the difference value of the block is applied. Recovering the original pixel values. The method of claim 37, wherein In the above process, when the prediction direction for the partial region of the first block is a prediction direction that is not applicable to the entire target block, the pixel of the difference value of the target block is originally obtained by performing DC prediction or plane prediction in reverse. Restoring to a pixel value of. The method of claim 31, wherein The process is performed when the header information of the target block indicates that the internal coded using the prediction information of the corresponding block of the second layer. The method of claim 31, wherein The process may include adding data of the first block or a partial region to data in the target block, and then adding the added target block using adjacent pixels of the target block based on prediction information of the first block. Method to restore original pixel value.

Images