JP2010034946A - Moving image encoding apparatus and decoding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moving image encoding apparatus and decoding apparatus, for enhancing predictive vector performance. <P>SOLUTION: This invention relates to the moving vector encoding apparatus which allows inter-coding in encoding for the unit of a macro block, wherein an inter-coding predictive value generation unit includes: vector evaluation value calculation sections 22a, 22b for obtaining evaluation values of reference vectors of neighboring encoded blocks; a predictive vector control section 25 for determining whether the reference vector is suited to a processing block on the basis of the evaluation values of the reference vectors; and a predictive vector generation section 23 for generating a median value predictive vector of a reference vector on the basis of the evaluation value of respective reference vectors; or a predictive vector generation section 24 for selecting either a median value of the reference vector or a median value of an average vector of the two reference vectors as a predictive vector on the basis of the determination of the predictive vector control section. The predictive vector is generated on the basis of the determination about whether or not the reference vector is suited to the processing block. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a moving picture coding apparatus and decoding apparatus that allow inter coding when a screen is divided into macro blocks (hereinafter referred to as MB) and coded in units of MB, and in particular, motion in coded adjacent MBs. The present invention relates to a video encoding device and a decoding device that generate a motion vector prediction vector in a processing MB from a vector.

  In a video encoding apparatus that allows inter-coding when encoding in MB units, adjacent to each other in inter-coding in units of MBs or blocks obtained by subdividing MBs (hereinafter simply referred to as blocks) A method for generating a prediction vector based on a motion vector (hereinafter referred to as a reference vector) of an encoded block (hereinafter referred to as a reference block) is shown in Non-Patent Document 1 below. By encoding only the difference between the prediction vector and the motion vector obtained by motion compensation by this method, it is possible to suppress the amount of code required for encoding the motion vector.

  Non-Patent Document 1 uses three or two adjacent blocks as reference blocks, calculates median (center) values for the x component and y component of all reference vectors, and is formed by the x component and y component. A prediction vector generation method using a vector as a prediction vector is disclosed.

This prediction vector generation method (that is, the prediction vector generation method in H.264) will be briefly described with reference to FIG. FIG. 10 shows a part of blocks when the screen is divided into blocks. In H.264, as shown in the figure, blocks located on the left, upper and upper right adjacent to the processing block are used as reference blocks. If the reference vectors in each reference block are Va = (x _a , y _a ), Vb = (x _b , y _b ), and Vc = (x _c , y _c ), the prediction vector Vpred = (x _pred , y _pred ) is obtained by the following equation (1).

  However, the function median () is a function for obtaining the median value of the argument, and follows the following equation (2).

Joint Video Team (JVT) of ISO / IEC MPEG and ITU-VCEG, “Text of ISO / IEC 14496 10 Advanced Video Coding 3rd Edition”, July 2004.

  However, in the above-described conventional prediction method, at most three reference vectors are input, and a median value for a coarse sample is used as a predicted value. Therefore, there is a problem that the accuracy of the predicted value is not necessarily good in all cases.

  The present invention has been made in view of the above-described prior art, and an object thereof is to provide a moving picture encoding apparatus and decoding apparatus that can improve prediction vector performance.

  In order to achieve the above object, the present invention provides a motion vector (hereinafter referred to as a reference vector) of an adjacent coded block in a video coding apparatus that allows inter coding when coding in units of macroblocks. ), A prediction vector control unit that determines the suitability of the reference vector for the processing block based on the evaluation value of each reference vector, and a reference vector based on the determination of the prediction vector control unit An inter-coded prediction value generation unit including a median value, or a prediction vector generation unit that selects a median value of an average vector of two reference vectors, respectively, as a prediction vector, and determines whether or not the reference vector is appropriate for the processing block The first feature is that a prediction vector is generated based on the above.

  Further, according to the present invention, the prediction vector control unit determines whether or not the reference vector is appropriate for the processing block based on the evaluation value of the reference vector, and as a result, the median value of the average vector of the reference vector is the prediction vector of the processing block. If the median value of the average vector of the reference vector or the median value of the reference vector is adopted as the prediction vector in the bit stream of the encoded data of the processing block The second feature is that control information to be expressed is added.

  Also, the present invention provides a motion vector evaluation that obtains an evaluation value of a motion vector (hereinafter referred to as a reference vector) of an adjacent encoded block in a video decoding apparatus that allows inter-coding when decoding in units of macroblocks. A value calculation unit, a prediction vector control unit that determines the suitability of the reference vector for the processing block based on the evaluation value of each reference vector, and a median value of the reference vector based on the determination of the prediction vector control unit, or two reference vectors each A prediction vector generation unit including a prediction vector generation unit that selects a median value of an average vector of the prediction vector as a prediction vector, and generates a prediction vector based on whether the reference vector is appropriate for the processing block. There is a third feature.

  Furthermore, the present invention further comprises means for analyzing control information from a bit stream of encoded data of the processing block, and the prediction vector control unit is configured to determine a reference vector for the processing block based on an evaluation value of the reference vector. When it is determined that there is a possibility that the median value of the average vector of the reference vectors may be appropriate as the prediction vector of the processing block, based on the control information obtained from the bitstream, The fourth feature is that either the median value of the average vector or the median value of the reference vector is used as the prediction vector.

  According to the first and second features of the present invention, a new prediction vector candidate, that is, a median value of an average vector of two reference vectors each is defined as a new prediction vector candidate, and a conventional method is performed according to the image feature. Thus, the prediction vector generation method is switched adaptively, so that the prediction vector performance is improved and the encoding efficiency is expected to be improved.

  Further, according to the third and fourth features of the present invention, the applicability of the newly defined prediction vector candidate is determined by evaluating a reference vector, and only when the candidate is valid Switch the vector generation method. As a result, prediction vector performance is improved, encoding efficiency is expected to be improved, and the amount of additional information necessary for the switching can be suppressed.

  Hereinafter, the present invention will be described in detail with reference to the drawings. First, a video encoding apparatus to which the present invention is applied will be described.

  The present invention allows inter-coding when encoding in units of MB in the screen, determines a motion vector by motion compensation, and predicts based on a motion vector (reference vector) of an adjacent encoded block It is assumed that a moving image encoding apparatus that generates a vector and encodes a difference between a motion vector and a prediction vector.

  FIG. 1 shows a block diagram of a video encoding apparatus according to an embodiment of the present invention.

  The intra-coded prediction value generation unit 1 receives as input the input video, the locally decoded pixel value i in the encoded block, and the information j regarding the intra prediction direction in the encoded block, and performs local decoding in the encoded block. Based on the pixel value i, a prediction value in each intra prediction direction in the processing block is generated. Then, by obtaining a difference from the input image with respect to the predicted value, coding distortion in intra coding is calculated. Further, a cost value in each intra prediction direction is calculated based on the information j regarding the intra prediction direction in the encoded distortion and the encoded block. The calculated cost values are compared, and the intra prediction direction most suitable for encoding the processing block is selected. As an output of the intra-coded prediction value generation unit 1, a prediction value a in the optimal intra prediction direction, information b regarding the prediction direction, and a cost value c in the prediction direction are output.

  The inter-coded prediction value generation unit 2 receives an input video, a locally decoded pixel value i in an encoded frame, and prediction information j in an adjacent encoded block in the same frame. However, the prediction information j includes information representing the motion vector and whether or not the invention method is applied. Then, the prediction value d in the optimal motion vector, the prediction information (motion vector and whether or not the inventive method is applied) e, and the cost value f in the prediction information are output. Since the present invention is characterized by the configuration of the inter-coded prediction value generation unit 2, details thereof will be described later with reference to FIGS.

  The mode determination control unit 3 receives the cost values c and f output from the intra-coded prediction value generation unit 1 and the inter-coding prediction value generation unit 2 and compares the input cost values. Select a suitable encoding mode. The mode determination control unit 3 uses the processing block for the prediction value (a, d) and the information (b, e) related to prediction output from the intra-coded prediction value generation unit 1 and the inter-coding prediction value generation unit 2. It switches so that the encoding mode suitable for encoding may be used for encoding.

  The DCT / quantization unit 4 receives the difference between the predicted value a or d for the input video and performs DCT processing and quantization processing on the input signal. Then, the quantized DCT coefficient g is output as the output.

  The IDCT / inverse quantization unit 5 receives the quantized DCT coefficient g, and performs inverse quantization processing and inverse DCT processing on the DCT coefficient g. As an output of the IDCT / inverse quantization unit 5, a pixel signal subjected to inverse DCT is output.

  The entropy encoding unit 6 receives the quantized DCT coefficient g and the prediction information j (b or e) and performs entropy encoding on the input signal. As an output of the entropy encoding unit 6, an entropy encoded result is output as encoded data h. The encoded data h is sent out as a bit stream.

  In the local memory (1) 7, a signal obtained by summing the predicted value and the inverse DCT pixel signal, that is, a locally decoded pixel value i is input. The local memory (1) 7 accumulates the locally decoded pixel value i and supplies it to the intra-coded prediction value generation unit 1 and the inter-coding prediction value generation unit 2 as appropriate.

  In the local memory (2) 8, information j (b or e) regarding the prediction method applied in the encoded block is input. The information j includes information indicating whether the inventive method is applied. Then, the prediction information j in the encoded block is accumulated, and the information j is supplied to the intra-coded prediction value generation unit 1 and the inter-coding prediction value generation unit 2 as appropriate. The prediction information j includes the MV of the encoded block, the difference vector, information on whether or not the inventive method is applied, and the like.

  Next, a video decoding device according to an embodiment of the present invention will be described. FIG. 2 is a block diagram of a moving picture decoding apparatus that allows extended intra coding when encoding is performed in units of MBs in a screen. The moving picture decoding apparatus includes an encoded data analysis unit 11, an intra prediction value generation unit 12, an inter prediction value generation unit 13, a prediction method control unit 14, and a memory 15.

  The encoded data analysis unit (or entropy decoding unit) 11 receives the encoded data h sent as a bit stream. The input encoded data h includes information indicating whether the inventive method is applied. The encoded data analysis unit 11 entropy-decodes the encoded data and analyzes the contents described in the encoded data according to the syntax. As an output of the encoded data analysis unit 11, a residual signal k, prediction information m, and control information m ′ of a motion vector prediction method in inter coding (control information 30b described later) obtained as a result of syntax analysis are obtained. Is output.

  In the intra prediction value generation unit 12, the prediction information m obtained from the encoded data analysis unit 11 and the decoded pixel value n obtained from the memory 15 are input, and based on the decoded pixel value n, the intra prediction value m is received according to the prediction information m. A predicted value p is generated, and the intra predicted value p is output.

  In the inter-coded prediction value generation unit 13, the locally decoded pixel value n in the encoded frame, the prediction information m in the adjacent decoded block and processing block in the same frame, and the control information m ′ of the motion vector prediction method As an input. Then, a predicted value q in inter coding is output as an output of the inter coded predicted value generation unit 13. Since the present invention is characterized by the configuration of the inter prediction value generation unit 13, the details thereof will be described later with reference to FIGS.

  The prediction method control unit 14 receives the prediction information m obtained from the encoded data analysis unit 11. The prediction method control unit 14 identifies whether the prediction information m relates to intra prediction or inter prediction, and outputs a control signal r for switching between intra prediction and inter prediction.

  In the memory 15, the decoded pixel value n is input, the decoded pixel value n is accumulated, and the decoded pixel value n is generated by the intra prediction value generation unit 12 and the inter prediction value generation unit when the undecoded block is decoded. Input to the part 13 as appropriate.

  Next, an embodiment of the inter-coded prediction value generation unit 2 of the encoding device of the present invention will be described in detail with reference to FIGS. 3 and 5. FIG. 3 is a block diagram of the first embodiment of the inter-coded prediction value generation unit 2, which generates a prediction vector based only on the reference vector. FIG. 5 is a block diagram of the second embodiment of the inter-coded prediction value generation unit 2, which generates a prediction vector based on control information and a reference vector of a prediction vector control method.

  First, the configuration and operation of the first embodiment of the inter-coded prediction value generation unit 2 that generates a prediction vector based only on a reference vector will be described with reference to FIG.

  The MV (Motion Vector) extraction unit 21 receives the prediction information j in the neighboring encoded block supplied from the local memory (2) 8, and extracts the MV information in the neighboring block from the prediction information j. Then, as the output, the MV in the encoded block adjacent to the processing block is output.

  H. The H.264 prediction vector generation unit 23 receives the motion vector MV in each adjacent encoded block (for example, the left, upper, and upper right blocks with respect to the processing block). The H.P. The H.264 prediction vector generation unit 23 calculates a median value with respect to the x component and the y component in each motion vector, uses the obtained vector composed of the x component and the y component as a prediction vector, and outputs the generated prediction vector 23a. The H.P. The operation of the H.264 prediction vector generation unit 23 is as described with reference to FIG.

  The inventive method predictive vector generation unit 24 receives the motion vectors MV in adjacent encoded blocks as input, and averages two average vectors for the motion vectors in the encoded blocks adjacent to the processing block on the left, top, and top right. Is calculated. A median value is calculated for the x component and y component in the average vector, and the resulting vector consisting of the x component and y component is taken as the prediction vector. The generated prediction vector 24 a is output as an output of the inventive technique prediction vector generation unit 24.

  In the evaluation value calculation unit (1) 22a, motion vectors (reference vectors) in adjacent encoded blocks (for example, blocks on the left, upper, and upper right with respect to the processing block) are input. Then, the part 22a calculates a deviation value from another reference vector for each reference vector, and outputs the deviation value (hereinafter, a deviation evaluation value).

  In the evaluation value calculation unit (2) 22b, motion vectors (reference vectors) in adjacent encoded blocks (for example, blocks on the left, upper, and upper right with respect to the processing block) are input. Then, in the same part 22b, for each reference vector, a density value is calculated, and the density value (hereinafter referred to as a density evaluation value) is output.

  The prediction vector control unit (1) 25 inputs the divergence value output from the evaluation value calculation unit (1) 22a and the congestion value output from the evaluation value calculation unit (2) 22b. Then, when the deviation is larger than a predetermined value in any of the reference vectors, it is determined that the inventive method prediction vector is inappropriate for the processing block. Further, when the density of the reference vectors is higher than a predetermined value, it is determined that the inventive method prediction vector is inappropriate for the processing block. When the prediction vector control unit (1) 25 determines that the inventive method prediction vector is inappropriate for the divergence and / or density, the inventive method prediction vector is inappropriate for the processing block. Judge that there is. When the inventive method prediction vector is inappropriate, the prediction vector is H.264. A prediction vector based on the H.264 method is selected, and otherwise, a control signal 25a that employs the inventive method prediction vector is output.

  When the divergence is greater than a predetermined value, it is highly likely that the motion vector having a large divergence is abnormal due to noise or the like because the processing method prediction vector is determined to be inappropriate in the processing block. This is to prevent the abnormal motion vector from participating in the reference vector. In addition, when the density of the reference vectors is higher than a predetermined value, it is determined that the inventive method prediction vector is inappropriate in the processing block because of the prediction vector obtained by the inventive method and the H.264 standard. This is because almost the same prediction vector is obtained with the prediction vector based on the H.264 method.

  Here, a specific example of how to calculate the evaluation value of the divergence and the evaluation value of the density and how to evaluate the evaluation value will be described. As the evaluation value calculation method and evaluation method, the following two methods are conceivable.

  (a) Evaluation using reference vector components

  For each of the horizontal components and vertical components of a plurality of, for example, three reference vectors, the respective variance values are calculated. When any variance value exceeds a predetermined threshold A, it is determined that a divergence has occurred. Further, when any variance value falls below a predetermined threshold value B (B <A), it is determined that it is dense.

  (b) Evaluation using distance between reference vectors

  The distance between each of a plurality of, for example, three reference vectors is calculated. Here, the distance between the reference vectors indicates the distance of the difference vector for each of the two reference vectors. When the distance between any of the reference vectors exceeds a predetermined threshold A ′, it is determined that a divergence has occurred. Further, when the distance between any reference vectors is below a predetermined threshold value B ′ (B ′ <A ′), it is determined that the reference vectors are dense.

  In the above embodiment, the evaluation value calculation unit (1) 22a calculates the evaluation value of the divergence, and the evaluation value calculation unit (2) 22b calculates the evaluation value of the congestion. Instead of the two evaluation value calculation units (1) and (2), these may be integrated into one evaluation value calculation unit. This integration is the same in the embodiments of FIGS. 5, 7 and 8 described later.

  FIG. 4 is a flowchart for explaining the function of the prediction vector control unit (1) 25, but the explanation of the flowchart is omitted.

  Next, the reference destination determination unit 26 receives the input video and the locally decoded signal i in the encoded frame as inputs. In the same unit 26, the input image in the processing block is searched for the position of the same rectangle that is closest to the signal within the search range for the locally decoded signal. For the position where the signal is closest, the spatial relative position from the processing block is taken as a motion vector. In addition, the same pixel value is used as a predicted value for a locally decoded signal at a position where the signal is closest. Further, the difference between the prediction values for the input video is defined as a prediction error. As an output of the unit 26, a motion vector 26a, a predicted value d, and a prediction error 26b are output.

  The vector difference extraction unit 27 receives the motion vector 26 a output from the reference destination determination unit 26 and the prediction vector 23 a or 24 a output from the prediction vector generation unit 23 or 24. In the same unit 27, the difference of the prediction vector with respect to the motion vector is set as a difference vector e. In addition, entropy coding is performed on the difference vector e to obtain a code amount generated by the difference vector. As an output of the same unit 27, a difference vector e (information relating to prediction used when decoding) and a code amount 27a required for encoding the difference vector are output.

  In the distortion calculation unit 28, the input video and the prediction error 26b and the prediction value d output from the reference destination determination unit 26 are input. The same unit 28 performs DCT, quantization, inverse quantization, and inverse DCT on the input prediction error 26b. A signal (local decoded signal) obtained by adding a prediction value to the result obtained by performing inverse DCT is obtained. Here, the difference of the local decoded signal with respect to the input signal is obtained, and the sum of squares is obtained for the difference signal. As the output of the same unit 28, the sum of squares of the difference signal (encoding distortion 28a) is output.

  The cost value calculation unit 29 receives the code amount 27 a of the difference vector output from the vector difference extraction unit 27 and the encoded distortion 28 a output from the distortion calculation unit 28. In the same unit 29, the code amount 27a and the coding distortion 28a are input to the cost function to obtain a cost value. The cost value f is output as the output of the unit 29.

  As described above, according to this embodiment, the evaluation value calculation units (1) and (2) evaluate the reference vector to determine whether the prediction vector 24a generated by the inventive method prediction vector generation unit 24 is appropriate. Only when the prediction vector 24a is valid, the prediction vector generated by the inventive method prediction vector generation unit 24 is adopted, so that the prediction vector performance can be improved.

  Next, the configuration and operation of the second embodiment of the inter-coded prediction value generation unit 2 will be described with reference to FIG. Since the second embodiment is the same as or equivalent to the block diagram of FIG. 3 except for the prediction vector control unit (2) 30, only the prediction vector control unit (2) 30 will be described below and other configurations will be described. Description of is omitted.

  In the prediction vector control unit (2) 30, the prediction vector generated based on the information 25a on the suitability of the invention method prediction vector in the processing block, which is output from the prediction vector control unit (1) 25, and the invention method prediction vector generation unit 24 24a, and H.I. The prediction vector 23 a generated based on the H.264 prediction vector generation unit (conventional method) 23 is input. In the same unit 30, when the prediction vector control unit (1) determines that the inventive method prediction vector is applicable in the processing block, the prediction vector 24a generated based on the inventive method 24 and the conventional method 23 are used. An appropriate prediction vector is selected based on the superiority or inferiority of the encoding performance for the prediction vector 23a generated based on the prediction vector 23a. For example, in the case where each of the prediction vectors 23a and 24a is used, an evaluation value indicating each encoded data amount or encoding performance is obtained, and an evaluation value indicating the smaller encoded data amount or the encoding performance is obtained. Choose a good prediction vector.

  Then, as the output of the same unit 30, the control signal 30a for controlling the prediction vector input to the vector difference extraction unit 27 and the prediction vector control unit (1) can apply the inventive method prediction vector in the processing block. If it is determined, the control information 30b representing the method used for generating the prediction vector in the processing block is output. The control information 30b is entropy encoded and included in a bitstream not shown as part of the encoded data h (see FIG. 1). The bit stream is transmitted to a decoding device to be described later.

  FIG. 6 is a flowchart for explaining the functions of the prediction vector control unit (1) 25 and the prediction vector control unit (2) in FIG. As shown in the figure, the prediction vector control unit (2) includes the inventive method and H.264. As a result of the comparison of the coding performance of the H.264 method, when it is determined that the inventive method is superior, 1-bit control information “a” is assigned as the control information 30b, and the inventive method is predicted by the control signal 30a. Vector 24a is selected. On the other hand, H. If it is determined that the H.264 method is superior, 1-bit control information “b” is assigned as the control information 30b, and the control signal 30a is used to generate the H.264 method. H.264 prediction vector 23a is selected.

  As described above, according to the present embodiment, when it is determined that the prediction vector 24a generated by the prediction vector generation unit 24 from the prediction vector control unit (1) 25 is valid, the encoding performance is further increased. Since an appropriate prediction vector is selected based on the superiority or inferiority of the above, the prediction vector performance is improved, and the encoding efficiency is expected to be improved.

  Next, an embodiment of the inter prediction value generation unit 13 (see FIG. 2) in the video decoding device will be described with reference to FIGS. FIG. 7 is a block diagram of an inter prediction value generation unit corresponding to the first embodiment (FIG. 3) of the inter-coded prediction value generation unit, and generates a prediction vector based only on a reference vector. FIG. 8 is a block diagram of an inter prediction value generation unit corresponding to the second embodiment (FIG. 5) of the inter-coded prediction value generation unit, and predicts based on control information and a reference vector of a prediction vector control method. A vector is generated.

  First, the inter prediction value generation unit in FIG. 7 will be described. In the evaluation value calculation unit (1) 44a, motion vectors (reference vectors) in adjacent encoded blocks output from the MV extraction unit 41 (for example, left, upper, and upper right blocks with respect to the processing block) are input. To do. Then, the part 44a calculates a deviation value from each of the reference vectors for each reference vector, and outputs an evaluation value of the deviation.

  In the evaluation value calculation unit (2) 44b, motion vectors (reference vectors) in adjacent encoded blocks output from the MV extraction unit 41 (for example, left, upper, and upper right blocks with respect to the processing block) are input. To do. Then, the same unit 44b calculates a congestion value for each reference vector, and outputs the evaluation value of the congestion.

  The prediction vector control unit (1) 45 inputs the divergence value output from the evaluation value calculation unit (1) 44a and the congestion value output from the evaluation value calculation unit (2) 44b. Then, when the deviation is larger than a predetermined value in any of the reference vectors, it is determined that the inventive method prediction vector is inappropriate for the processing block. Further, when the density of the reference vectors is higher than a predetermined value, it is determined that the inventive method prediction vector is inappropriate for the processing block. The prediction vector control unit (1) 45 determines that the inventive method prediction vector is inappropriate for the processing block when it is determined that the inventive method prediction vector is inappropriate for the divergence and / or density. Judge that there is. When the inventive method prediction vector is inappropriate, the prediction vector is H.264. The prediction vector 42a based on the H.264 method is selected, and otherwise, a control signal 45a that employs the inventive method prediction vector 43a is output. The evaluation of the divergence and denseness is as described above, and thus the description thereof is omitted.

  The invented technique prediction vector generation unit 43 receives a motion vector in an adjacent encoded block as an input. In the same unit 43, two average vectors are calculated for each motion vector (reference vector) in an encoded block adjacent to the processing block on the left, top, and top right. A median value is calculated for the x component and the y component in the average vector, and the resulting vector composed of the x component and the y component is set as a prediction vector. As an output of the same unit 43, the generated prediction vector 43a is output.

  Next, the inter prediction value generation unit in FIG. 8 will be described. FIG. 8 is a block diagram of an inter prediction value generation unit that generates a prediction vector based on information for controlling a prediction vector generation method and a reference vector.

  The block diagram shown in FIG. 8 is the same as FIG. 7 except for the prediction vector control unit (2) 48, and therefore only the prediction vector control unit (2) 48 will be described below.

  In the prediction vector control unit (2) 48, information 45a on the suitability of the invention method prediction vector in the processing block output from the prediction vector control unit (1) 45, and the method used for generating the prediction vector included in the encoded data Is input as control information 30b. In the same unit 48, when the prediction vector of the present invention is appropriate, the prediction vector generation method is controlled according to the control information 30b. As an output of the unit 48, a signal 48a for controlling the prediction vector generation method is output.

  FIG. 9 is a flowchart illustrating the functions of the prediction vector control unit (1) 45 and the prediction vector control unit (2) 48 in FIG. In the figure, (a) shows the function of the predictive vector control unit (1) 45, and (b) shows the function of the predictive vector control unit (2) 48. Is omitted.

  Next, an effect example of the present invention will be shown. As a simulation, the inventive method was implemented in an encoder and an encoding experiment was conducted. The evaluation of the divergence and density of the reference vectors in the determination of the suitability of the inventive method was in accordance with the above-mentioned “(b) Evaluation using the distance between reference vectors”. As a result of encoding experiments on HDTV material in the same evaluation, an average code amount reduction of about 1.88% at maximum was obtained. From the above, it was confirmed that the encoding performance was improved by the inventive method.

It is a block diagram which shows the structural example of the moving image encoding apparatus containing the inter coding prediction value production | generation part of this invention. It is a block diagram which shows the structural example of the moving image decoding apparatus containing the inter estimated value production | generation part of this invention. It is a block diagram which shows the structure of 1st Embodiment of the inter coding prediction value production | generation part of this invention. It is a flowchart which shows the outline of operation | movement of the prediction vector control part (1) of FIG. It is a block diagram which shows the structure of 2nd Embodiment of the inter coding prediction value production | generation part of this invention. It is a flowchart which shows the outline of operation | movement of the prediction vector control part (1) of FIG. 5, and a prediction vector control part (2). It is a block diagram which shows the structure of 1st Embodiment of the inter estimated value production | generation part of this invention. It is a block diagram which shows the structure of 2nd Embodiment of the inter estimated value production | generation part of this invention. It is a flowchart which shows the outline of operation | movement of the prediction vector control part (1) of FIG. 8, and a prediction vector control part (2). It is explanatory drawing of the prediction vector production | generation method by the conventional method.

Explanation of symbols

  2 ... Inter-coded prediction value generation unit, 13 ... Inter prediction value generation unit, 22a, 22b, 44a, 44b ... Evaluation value value calculation unit (1), (2), 23, 42,.・ H. 264 prediction vector generation unit, 24, 43... Invention method prediction vector generation unit, 25, 45... Prediction vector control unit (1), 30, 48.

Claims (10)

In a video encoding apparatus that allows inter encoding when encoding in units of macroblocks,
A motion vector evaluation value calculation unit that obtains an evaluation value of a motion vector (hereinafter referred to as a reference vector) of an adjacent encoded block, and a prediction vector control unit that determines whether a reference vector is appropriate for a processing block based on the evaluation value of each reference vector And a prediction vector generation unit that selects a median value of a reference vector or a median value of an average vector of two reference vectors based on the determination of the prediction vector control unit to generate a prediction vector. Comprising
A moving picture coding apparatus, characterized in that a prediction vector is generated on the basis of determination of suitability of a reference vector for a processing block. The moving image encoding device according to claim 1,
The moving picture coding apparatus characterized in that a variance value of a horizontal component and a vertical component of each reference vector is used as the evaluation value of the reference vector. The moving image encoding device according to claim 1,
A moving picture encoding apparatus, wherein a distance between two reference vectors of each reference vector is used as the evaluation value of the reference vector. The moving picture encoding device according to any one of claims 1 to 3,
The prediction vector control unit determines whether or not the reference vector for the processing block is appropriate based on the evaluation value of the reference vector, and as a result, the median value of the average vector of the reference vector may be appropriate as the prediction vector of the processing block. When it is judged that there is, the moving image encoding apparatus characterized by using the median value of the average vector of the reference vectors as the prediction vector in the processing block. The moving picture encoding device according to any one of claims 1 to 3,
The prediction vector control unit determines whether or not the reference vector for the processing block is appropriate based on the evaluation value of the reference vector, and as a result, the median value of the average vector of the reference vector may be appropriate as the prediction vector of the processing block. If it is determined that there is, control information indicating whether the median value of the average vector of the reference vector or the median value of the reference vector is adopted as the prediction vector is added to the bit stream of the encoded data of the processing block A moving picture coding apparatus characterized by the above. In a video decoding device that allows inter-coding when decoding in units of macroblocks,
A motion vector evaluation value calculation unit that obtains an evaluation value of a motion vector (hereinafter referred to as a reference vector) of an adjacent encoded block, and a prediction vector control unit that determines whether a reference vector is appropriate for a processing block based on the evaluation value of each reference vector An inter prediction value generation unit including a prediction vector generation unit that selects a median value of a reference vector or a median value of an average vector of two reference vectors based on the determination of the prediction vector control unit, and sets the prediction vector as a prediction vector. Equipped,
A moving picture decoding apparatus, characterized in that a prediction vector is generated based on determination of suitability of a reference vector for a processing block. The moving picture decoding apparatus according to claim 6,
A moving picture decoding apparatus characterized in that a variance value of a horizontal component and a vertical component of each reference vector is used as the evaluation value of the reference vector. The moving picture encoding apparatus according to claim 6, wherein
A distance between two reference vectors of each reference vector is used as the evaluation value of the reference vector. The moving picture decoding apparatus according to claim 6, 7 or 8,
The prediction vector control unit determines whether or not the reference vector for the processing block is appropriate based on the evaluation value of the reference vector, and as a result, the median value of the average vector of the reference vector may be appropriate as the prediction vector of the processing block. When it is judged that there is, the moving picture decoding apparatus characterized by using the median value of the average vector of the reference vectors as the prediction vector in the processing block. The moving picture decoding apparatus according to claim 6, 7 or 8,
Means for analyzing control information from the bit stream of the encoded data of the processing block;
The prediction vector control unit determines whether or not the reference vector for the processing block is appropriate based on the evaluation value of the reference vector, and as a result, the median value of the average vector of the reference vector may be appropriate as the prediction vector of the processing block. When it is determined that there is an image, a moving picture decoding apparatus using, based on control information obtained from the bitstream, a median value of an average vector of reference vectors or a median value of reference vectors as a prediction vector .

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