JP2007173886A - Moving picture coding method, moving picture coding apparatus, moving picture coding program, and recording medium for moving picture coding program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology capable of efficiently determining a prediction mode by reducing the arithmetic calculation amount required for deriving prediction sample values for selecting the prediction mode in moving picture coding attended with in-image prediction coding. <P>SOLUTION: A prediction sample value calculation section 11 in a moving picture coding apparatus 10 calculates the prediction sample values required for selecting the prediction mode on the basis of pixel values of coded blocks in the vicinity of a coding object block and stores the calculated prediction sample values to a prediction sample value storage section 12. In this case, the prediction sample value calculation section 11 calculates the prediction sample values in common to a plurality of prediction modes only once for all the prediction modes. A prediction mode determining section 14 reads the prediction sample values from the prediction sample value storage section 12 when evaluating the prediction modes and determining the prediction mode of the coding object block by using the read prediction sample values. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a video encoding method H.264. In moving picture coding with intra-picture predictive coding such as H.264, a moving picture coding method, a moving picture coding apparatus, and a moving picture that enable efficient intra-picture coding (intra coding) The present invention relates to an encoding program and a moving image encoding program recording medium.

  As a moving image encoding accompanied with intra-screen predictive encoding, a video encoding scheme H.264 is used. As an example, for intra 4 × 4 sample prediction specified in this video coding scheme, Intra — 4 × 4 —Vertical (intra 4 × 4 prediction mode 0), Intra — 4 × 4 —Horizontal (intra 4 × 4 prediction mode 1) , Intra_4x4_DC (Intra 4x4 prediction mode 2), Intra_4x4_Diagonal_Down_Left (Intra 4x4 prediction mode 3), Intra_4x4_Diagonal_Down_Right (Intra 4x4 prediction mode 4), Intra_4x4_Vertical_Right mode (Intra 4x prediction mode 2) 5), Intra_4x4_Horizontal_Down (intra 4x4 prediction mode 6), Intra_4x4_Vertical_Left (intra 4x4 prediction mode 7), and Intra_4x4_Horizontal_Up (intra 4x4 prediction mode 8).

  The encoder selects one intra 4 × 4 sample prediction from these prediction modes if intra 4 × 4 encoding is performed. In reference software JM10.1 (see Non-Patent Document 1), prediction sample values are derived in order for these nine prediction modes.

  Similarly, H.C. Intra 8 × 8_Vertical (intra 8 × 8 prediction mode 0), Intra — 8 × 8_Horizontal (intra 8 × 8 prediction mode 1), Intra — 8 × 8_DC (intra 8) X8 prediction mode 2), Intra_8x8_Diagonal_Down_Left (Intra 8x8 prediction mode 3), Intra_8x8_Diagonal_Down_Right (Intra 8x8 prediction mode 4), Intra_8x8_Vertical_Right (Intra 8x8 prediction mode 5), Intra_8xDown_Horizontal There are nine prediction modes: intra 8 × 8 prediction mode 6), Intra — 8 × 8_Vertical_Left (intra 8 × 8 prediction mode 7), and Intra — 8 × 8_Horizontal_Up (intra 8 × 8 prediction mode 8).

If the encoder performs intra 8 × 8 encoding, it selects one intra 8 × 8 sample prediction from these prediction modes. In the reference software JM10.1 (see Non-Patent Document 1), predicted sample values are derived in order for these nine patterns.
H.264 / AVC Reference Software, version: JM 10.1 http://iphome.hhi.de/suehring/tml/download/jm10.1.zip, September, 2005.

  For example, the video encoding method H.264. When the intra 4 × 4 prediction mode is selected in H.264, 4 × 4 × 9 = 144 prediction samples are obtained in order to derive prediction sample values of 4 × 4 blocks in order for all nine prediction modes. Value calculation is required. In addition, when the intra 8 × 8 prediction mode is selected by the same method, 8 × 8 × 9 = 576 pieces of prediction sample values for 8 × 8 blocks are sequentially derived for nine prediction modes. Calculation of the predicted sample value is required. Therefore, when there is a limit to the amount of calculation within a unit time such as when performing real-time encoding, there is a problem that only a part of the nine prediction modes can be selected.

  The present invention solves the above-described problems, reduces the amount of calculation necessary for deriving these prediction sample values, and efficiently selects the intra 4 × 4 prediction mode and the intra 8 × 8 prediction mode. The purpose is to be able to.

  In order to solve the above-described problem, the present invention calculates a prediction sample value that is a common value among a plurality of prediction modes and stores it in the storage area only once, and uses this prediction sample value. When the prediction mode is evaluated, the calculation amount is reduced by reading from the storage area to reduce the number of calculations for deriving the prediction sample value.

  Specifically, the moving picture coding method according to the present invention is a common value for at least two prediction modes among the selectable prediction modes in the moving picture coding method with intra prediction encoding. The prediction sample value is calculated only once based on the pixel values of neighboring coded blocks, the calculated prediction sample value is stored in the storage area, and the prediction sample value stored in the process of selecting the prediction mode is stored. It is characterized by being read from the area and used.

  In addition, the moving image encoding apparatus according to the present invention is common to at least two prediction modes among selectable prediction modes in a moving image encoding apparatus that performs moving image encoding with intra-screen predictive encoding. A prediction sample value calculation unit that calculates a prediction sample value that is a value of the pixel value of a neighboring encoded block only once, a prediction sample value storage unit that holds the calculated prediction sample value, and a prediction And a prediction mode determination unit that reads a prediction sample value held in the prediction sample value storage unit and determines a prediction mode when evaluating the mode.

  The above-described processing for realizing the moving image encoding apparatus can be realized by a computer and a software program, and the program can be recorded on a computer-readable recording medium or provided through a network. is there.

  According to the present invention, prediction sample values that are common values among a plurality of prediction modes are calculated only once and the calculation results are stored in a storage area, thereby reducing the number of times of prediction sample value derivation, The amount of calculation required for selecting the prediction mode can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration example of a moving picture coding apparatus according to an embodiment of the present invention. The moving picture encoding apparatus 10 includes a prediction sample value calculation unit 11, a prediction sample value storage unit 12, an encoded block pixel value storage unit 13, a prediction mode determination unit 14, an encoding unit 15, and a local decoded image creation unit 16. Prepare.

  The prediction sample value calculation unit 11 calculates a prediction sample value necessary for selection of the prediction mode, using the pixel value of the encoded block near the encoding target block. At this time, a prediction sample value that is a common value in a plurality of prediction modes is calculated only once. The predicted sample value storage unit 12 stores the calculated predicted sample value. The encoded block pixel value storage unit 13 stores the pixel values of blocks that have already been encoded and decoded.

  The prediction mode determination unit 14 is optimal for encoding the encoding target block of the input original image using the already calculated prediction sample value and the pixel value of the encoded block near the encoding target block. The correct prediction mode. The encoding unit 15 encodes the encoding target block in the determined prediction mode, and outputs the obtained encoded stream. The local decoded image creation unit 16 decodes the encoded image.

[Embodiment 1]
FIG. It is a figure which shows the name and coordinate of the pixel value of the coded block of the encoding object block vicinity in a H.264 4x4 intra brightness | luminance prediction. In the first embodiment, the present invention is described in H.264. An example when applied to H.264 intra 4 × 4 sample prediction will be described.

  In the moving image encoding apparatus 10, the prediction sample value calculation unit 11 calculates necessary prediction sample values in advance based on the pixel values of the encoded blocks near the encoding target block. The predicted sample value is calculated using the following formula.

  In the following formula, for example, PXA represents an average value of two pixel values of PX and PA. For example, PXAAAB indicates an average value of four pixel values of PX, PA, PA, and PB. “>> 1” and “>> 2” indicate 1-bit right shift and 2-bit right shift, respectively, which means division by 2 (decimal point truncation) and division by 4 (decimal point truncation), respectively. For example, in “(PX + PA + 1) >> 1” in the first equation, 1 is further added to PX + PA so that the calculation result is rounded off after the decimal point.

PXA = (PX + PA + 1) >> 1
PAB = (PA + PB + 1) >> 1
PBC = (PB + PC + 1) >> 1
PCD = (PC + PD + 1) >> 1
PDE = (PD + PE + 1) >> 1
PEF = (PE + PF + 1) >> 1
PXAAB = (PXA + PAB) >> 1
PABBC = (PAB + PBC) >> 1
PBCCD = (PBC + PCD) >> 1
PCDDE = (PCD + PDE) >> 1
PDEEF = (PDE + PEF) >> 1
PEFFG = (PEF + ((PF + PG + 1) >> 1)) >> 1
PFGGGH = (PF + 2 * PG + PH + 2) >> 2
PGHHH = (PG + 3 * PH + 2) >> 2
PXI = (PX + PI + 1) >> 1
PIJ = (PI + PJ + 1) >> 1
PJK = (PJ + PK + 1) >> 1
PKL = (PK + PL + 1) >> 1
PAXXI = (PAX + PXI) >> 1
PXIIJ = (PIJ + PXI) >> 1
PIJJK = (PJJ + PIJ) >> 1
PJKKL = (PKL + PJK) >> 1
PKLLL = (PKL + ((2 * PL + 1) >> 1)) >> 1
if (UP_AVAIL && LEFT_AVAIL)
PDCLEVEL = (PAB + PCD + PIJ + PKL) >> 2
else if (LEFT_AVAIL)
PDCLEVEL = (PIJ + PKL) >> 1
else if (UP_AVAIL)
PDCLEVEL = (PAB + PCD) >> 1
else
PDCLEVEL = DCPREDLEVEL
Here, in the above equations, UP_AVAIL and LEFT_AVAIL indicate that the pixels of the upper adjacent block and the left adjacent block are available for intra 4 × 4 prediction (available for Intra — 4 × 4 prediction), respectively. DCPREDLEVEL is a predetermined constant value.

  The 24 pixel values calculated by the above formula group are stored in the predicted sample value storage unit 12. The prediction mode determination unit 14 uses these retained 24 pixel values and 8 pixels of PA, PB, PC, PD, PI, PJ, PK, and PL, which are pixel values of the encoded blocks near the encoding target block. Using a total of 32 pixel values, a prediction sample value in each prediction mode is derived, and an optimal prediction mode is determined.

  FIG. 3 is a diagram illustrating predicted sample values in the case of the intra 4 × 4 prediction mode 0. As shown in FIG. 3, in the case of intra 4 × 4 prediction mode 0, 16 prediction sample values are derived from PA, PB, PC, and PD stored in the encoded block pixel value storage unit 13. Can do.

  FIG. 4 is a diagram illustrating prediction sample values in the case of the intra 4 × 4 prediction mode 1. As shown in FIG. 4, in the case of the intra 4 × 4 prediction mode 1, 16 prediction sample values are derived from PI, PJ, PK, and PL stored in the encoded block pixel value storage unit 13. Can do.

  FIG. 5 is a diagram illustrating prediction sample values in the case of the intra 4 × 4 prediction mode 2. As shown in FIG. 5, in the case of the intra 4 × 4 prediction mode 2, 16 prediction sample values can be derived by the PDCLEVEL stored in the prediction sample value storage unit 12.

  FIG. 6 is a diagram illustrating prediction sample values in the case of the intra 4 × 4 prediction mode 3. As shown in FIG. 6, in the case of intra 4 × 4 prediction mode 3, 16 prediction sample values are stored in PABBC, PBCCD, PCDDE, PDEEF, PEFFG, PFGGGH, and PGHHH stored in the prediction sample value storage unit 12. Can be derived.

  FIG. 7 is a diagram illustrating prediction sample values in the case of intra 4 × 4 prediction mode 4. As shown in FIG. 7, in the case of intra 4 × 4 prediction mode 4, 16 prediction sample values are stored in PAXXI, PXAAAB, PABBC, PBCCD, PXIIJ, PIJJK, and PJKKL stored in the prediction sample value storage unit 12. Can be derived.

  FIG. 8 is a diagram illustrating prediction sample values in the case of intra 4 × 4 prediction mode 5. As shown in FIG. 8, in the case of the intra 4 × 4 prediction mode 5, PXA, PAB, PBC, PCD, PAXXI, PXAAB, PABBC, PBCCD, PXIIJ, PIJJJ stored in the predicted sample value storage unit 16 The number of predicted sample values can be derived.

  FIG. 9 is a diagram illustrating prediction sample values in the case of the intra 4 × 4 prediction mode 6. As shown in FIG. 9, in the case of the intra 4 × 4 prediction mode 6, PXI, PAXXI, PXAAB, PABBC, PIJ, PXIIJ, PJK, PIJJK, PKL, and PJKKL stored in the prediction sample value storage unit 12 The number of predicted sample values can be derived.

  FIG. 10 is a diagram illustrating prediction sample values in the case of the intra 4 × 4 prediction mode 7. As shown in FIG. 10, in the case of intra 4 × 4 prediction mode 7, PAB, PBC, PCD, PDE, PABBC, PBCCD, PCDDE, PDEEF, PEF, and PEFFG stored in the prediction sample value storage unit 12 The number of predicted sample values can be derived.

  FIG. 11 is a diagram illustrating prediction sample values in the case of intra 4 × 4 prediction mode 8. As shown in FIG. 11, in the case of intra 4 × 4 prediction mode 8, PIJ, PIJJK, PJK, PJKKL, PKL, PKLLL, encoded block pixel value storage unit 13 stored in the prediction sample value storage unit 12. 16 predicted sample values can be derived with the PL stored in.

  Thus, since all the prediction sample values in nine prediction modes can be obtained from the total of 32 pixel values of the 24 pixel values calculated in advance and the 8 pixel values of the neighboring encoded blocks without additional calculation, It is not necessary to calculate all the predicted sample values (4 × 4 × 9 = 144 predicted sample values) of the 4 × 4 block for each mode.

  In addition, when the prediction modes that can be selected in advance are limited to some of the nine prediction modes, calculation may be omitted for the prediction sample values related only to the prediction modes that cannot be selected in the above formula. Needless to say.

[Embodiment 2]
FIG. It is a figure which shows the name and coordinate of the pixel value of the coded block of the encoding object block vicinity in a H.264 8x8 intra brightness | luminance prediction. In the second embodiment, the present invention is described in H.264. An example when applied to H.264 intra 8 × 8 sample prediction will be described.

  In the moving image encoding apparatus 10, the prediction sample value calculation unit 11 calculates necessary prediction sample values in advance based on the pixel values of the encoded blocks near the encoding target block. The predicted sample value is calculated using the following formula. In the following expression, for example, PZA indicates an average value of two pixel values of PZ and PA. For example, PZAAB indicates an average value of four pixel values of PZ, PA, PA, and PB. “>> 1”, “>> 2”, and “>> 3” indicate 1-bit right shift, 2-bit right shift, and 3-bit right shift, respectively.

PZA = (PZ + PA + 1) >> 1
PAB = (PA + PB + 1) >> 1
PBC = (PB + PC + 1) >> 1
PCD = (PC + PD + 1) >> 1
PDE = (PD + PE + 1) >> 1
PEF = (PE + PF + 1) >> 1
PFG = (PF + PG + 1) >> 1
PGH = (PG + PH + 1) >> 1
PHI = (PH + PI + 1) >> 1
PIJ = (PI + PJ + 1) >> 1
PJK = (PJ + PK + 1) >> 1
PKL = (PK + PL + 1) >> 1
PZAAB = (PZA + PAB) >> 1
PABBC = (PAB + PBC) >> 1
PBCCD = (PBC + PCD) >> 1
PCDDE = (PCD + PDE) >> 1
PDEEF = (PDE + PEF) >> 1
PEFFG = (PEF + PFG) >> 1
PFGGH = (PFG + PGH) >> 1
PGHHI = (PGH + PHI) >> 1
PHIIJ = (PHI + PIJ) >> 1
PIJJK = (PIJ + PJK) >> 1
PJKKL = (PJK + PKL) >> 1
PKLLM = (PKL + ((PL + PM + 1) >> 1)) >> 1
PLMMN = (PL + 2 * PM + PN + 2) >> 2
PMNNO = (PM + 2 * PN + PO + 2) >> 2
PNOOP = (PN + 2 * PO + PP + 2) >> 2
POPPP = (PO + 3 * PP + 2) >> 2
PZQ = (PZ + PQ + 1) >> 1
PQR = (PQ + PR + 1) >> 1
PRS = (PR + PS + 1) >> 1
PST = (PS + PT + 1) >> 1
PTU = (PT + PU + 1) >> 1
PUV = (PU + PV + 1) >> 1
PVW = (PV + PW + 1) >> 1
PWX = (PW + PX + 1) >> 1
PAZZQ = (PZA + PZQ) >> 1
PZQQR = (PZQ + PQR) >> 1
PQRRS = (PQR + PRS) >> 1
PRSST = (PRS + PST) >> 1
PSTTU = (PST + PTU) >> 1
PTUUV = (PTU + PUV) >> 1
PUVVW = (PUV + PVW) >> 1
PVWWX = (PVW + PWX) >> 1
PWXXX = (PWX + ((2 * PX + 1) >> 1)) >> 1
if (UP_AVAIL && LEFT_AVAIL)
PDCLEVEL = (PAB + PCD + PEF + PGH
+ PQR + PST + PUV + PWX) >> 3
else if (LEFT_AVAIL)
PDCLEVEL = (PQR + PST + PUV + PWX) >> 2
else if (UP_AVAIL)
PDCLEVEL = (PAB + PCD + PEF + PGH) >> 2
else
PDCLEVEL = DCPREDLEVEL
Here, in the above formula group, UP_AVAIL and LEFT_AVAIL indicate that the pixels of the upper adjacent block and the left adjacent block are available for intra 8 × 8 prediction (available for Intra — 8 × 8 prediction), respectively. DCPREDLEVEL is a predetermined constant value.

  The 46 pixel values calculated by the above formula group are stored in the predicted sample value storage unit 12. The prediction mode determination unit 14 includes these 46 pixel values and PA, PB, PC, PD, PE, PF, PG, PH, PQ, and pixel values of encoded blocks near the encoding target block. A prediction sample value in each prediction mode is derived using a total of 62 pixel values of 16 pixel values of PR, PS, PT, PU, PV, PW, and PX, and an optimal prediction mode is determined.

  FIG. 13 is a diagram illustrating prediction sample values in the case of the intra 8 × 8 prediction mode 0. As shown in FIG. 13, in the case of the intra 8 × 8 prediction mode 0, 64 pieces of PA, PB, PC, PD, PE, PF, PG, PH stored in the encoded block pixel value storage unit 13 are used. Predictive sample values can be derived.

  FIG. 14 is a diagram illustrating prediction sample values in the case of the intra 8 × 8 prediction mode 1. As shown in FIG. 14, in the case of the intra 8 × 8 prediction mode 1, 64 PQ, PR, PS, PT, PU, PV, PW, and PX stored in the encoded block pixel value storage unit 13 are used. Predictive sample values can be derived.

  FIG. 15 is a diagram illustrating prediction sample values in the case of the intra 8 × 8 prediction mode 2. As shown in FIG. 15, in the case of the intra 8 × 8 prediction mode 2, 64 prediction sample values can be derived by PDCLEVEL stored in the prediction sample value storage unit 12.

  FIG. 16 is a diagram illustrating prediction sample values in the case of the intra 8 × 8 prediction mode 3. As shown in FIG. 16, in the case of the intra 8 × 8 prediction mode 3, PABBC, PBCCD, PCDDE, PDEEF, PEFFG, PFGHGH, PGHHI, PHIIJ, PIJJK, PJKKL, PKLLM stored in the predicted sample value storage unit 12. , PLMMN, PMNNO, PNOOP, POPPP, 64 prediction sample values can be derived.

  FIG. 17 is a diagram illustrating prediction sample values in the case of intra 8 × 8 prediction mode 4. As shown in FIG. 17, in the case of intra 8 × 8 prediction mode 4, PAZZQ, PZAAB, PABBC, PBCCD, PCDDE, PDEEF, PEFFG, PFGH, PZQQR, PQRRS, PRSST stored in the predicted sample value storage unit 12 , PSTTU, PTUUV, PUVVW, PVWWX, 64 prediction sample values can be derived.

  FIG. 18 is a diagram illustrating prediction sample values in the case of the intra 8 × 8 prediction mode 5. As shown in FIG. 18, in the case of the intra 8 × 8 prediction mode 5, PZA, PAB, PBC, PCD, PDE, PEF, PFG, PGH, PAZZQ, PZAAB, PABBC stored in the prediction sample value storage unit 12 , PBCCD, PCDDE, PDEEF, PEFFG, PFGGH, PZQQR, PQRRS, PRSST, PSTTU, PTUUV, PUVVW, 64 prediction sample values can be derived.

  FIG. 19 is a diagram illustrating prediction sample values in the case of the intra 8 × 8 prediction mode 6. As shown in FIG. 19, in the case of the intra 8 × 8 prediction mode 6, PZQ, PAZZQ, PZAAB, PABBC, PBCCD, PCDDE, PDEEF, PEFFG, PQR, PZQQR, PRS stored in the prediction sample value storage unit 12 , PRQQS, PST, PRSST, PTU, PSTTU, PUV, PTUUV, PVW, PUVVW, PWX, PVWWX, 64 prediction sample values can be derived.

  FIG. 20 is a diagram illustrating prediction sample values in the case of the intra 8 × 8 prediction mode 7. As shown in FIG. 20, in the case of the intra 8 × 8 prediction mode 7, PAB, PBC, PCD, PDE, PEF, PFG, PGH, PHI, PABBC, PBCCD, PCDDE stored in the predicted sample value storage unit 12 are used. , PDEEF, PEFFG, PFGHH, PGHHI, PHIIJ, PIJ, PIJJK, PJK, PJKKL, PKL, PKLLM, 64 prediction sample values can be derived.

  FIG. 21 is a diagram illustrating prediction sample values in the case of the intra 8 × 8 prediction mode 8. As shown in FIG. 21, in the case of the intra 8 × 8 prediction mode 8, PQR, PQRRS, PRS, PRSST, PST, PSTTU, PTU, PTUUV, PUV, PUVVW, PVW stored in the prediction sample value storage unit 12 , PVWWX, PWX, PWXXX, 64 predicted sample values can be derived from PX stored in the encoded block pixel value storage unit 13.

  As described above, since all the predicted sample values in the nine prediction modes are obtained from the total of 62 pixel values of the 46 pixel values calculated in advance and the 16 pixel values of the neighboring coded blocks without additional calculation, It is not necessary to calculate all the predicted sample values (8 × 8 × 9 = 576 predicted sample values) of the 8 × 8 block for each mode.

  In addition, when the prediction modes that can be selected in advance are limited to some of the nine prediction modes, calculation may be omitted for the prediction sample values related only to the prediction modes that cannot be selected in the above formula. Needless to say.

  The present invention has been described in the above. An example in which the present invention is applied to the H.264 coding system has been described, but the present invention is not limited to these embodiments, and the present invention can be applied to other systems as long as the system performs intra coding in the same manner. It is possible.

It is a figure which shows the structural example of the moving image encoder by embodiment of this invention. H. It is a figure which shows the name and coordinate of the pixel value of the coded block of the encoding object block vicinity in a H.264 4x4 intra brightness | luminance prediction. It is a figure which shows the prediction sample value in the case of intra 4x4 prediction mode 0. It is a figure which shows the prediction sample value in the case of intra 4x4 prediction mode 1. FIG. It is a figure which shows the prediction sample value in the case of intra 4x4 prediction mode 2. FIG. It is a figure which shows the prediction sample value in the case of the intra 4 * 4 prediction mode 3. FIG. It is a figure which shows the prediction sample value in the case of intra 4x4 prediction mode 4. It is a figure which shows the prediction sample value in the case of intra 4 * 4 prediction mode 5. FIG. It is a figure which shows the prediction sample value in the case of intra 4x4 prediction mode 6. It is a figure which shows the prediction sample value in the case of intra 4x4 prediction mode 7. It is a figure which shows the prediction sample value in the case of intra 4x4 prediction mode 8. H. It is a figure which shows the name and coordinate of the pixel value of the coded block of the encoding object block vicinity in a H.264 8x8 intra brightness | luminance prediction. It is a figure which shows the prediction sample value in the case of intra 8x8 prediction mode 0. It is a figure which shows the prediction sample value in the case of intra 8 * 8 prediction mode 1. FIG. It is a figure which shows the prediction sample value in the case of intra 8 * 8 prediction mode 2. FIG. It is a figure which shows the prediction sample value in the case of the intra 8 * 8 prediction mode 3. FIG. It is a figure which shows the prediction sample value in the case of the intra 8 * 8 prediction mode 4. FIG. It is a figure which shows the prediction sample value in the case of the intra 8 * 8 prediction mode 5. FIG. It is a figure which shows the prediction sample value in the case of the intra 8 * 8 prediction mode 6. FIG. It is a figure which shows the prediction sample value in the case of the intra 8x8 prediction mode 7. It is a figure which shows the prediction sample value in the case of the intra 8 * 8 prediction mode 8. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Moving image encoder 11 Prediction sample value calculation part 12 Prediction sample value memory | storage part 13 Encoded block pixel value memory | storage part 14 Prediction mode determination part 15 Encoding part 16 Local decoded image preparation part

Claims (4)

A video encoding method for performing video encoding with intra-screen predictive encoding,
Storing the pixel value of the encoded block in the encoded block pixel value storage means;
When calculating the prediction sample value corresponding to each prediction mode of the encoding target block based on the pixel value of the encoded block near the encoding target block stored in the encoded block pixel value storage means A prediction sample value calculation process for calculating a prediction sample value that is a common value for at least two prediction modes among the prediction modes that can be selected;
Storing and holding the calculated predicted sample value in the predicted sample value storage means;
A moving picture encoding method comprising: a prediction mode determination step of reading a prediction sample value stored in the prediction sample value storage means and determining a prediction mode to be applied to encoding of a block to be encoded. A video encoding device that performs video encoding with intra-screen predictive encoding,
Encoded block pixel value storage means for storing the pixel value of the encoded block;
Means for calculating a prediction sample value corresponding to each prediction mode of the encoding target block based on the pixel value of the encoded block near the encoding target block stored in the encoded block pixel value storage means; A prediction sample value calculating means for calculating a prediction sample value that is a common value for at least two prediction modes among prediction modes that can be selected;
Predicted sample value storage means for storing and holding the calculated predicted sample value;
A moving picture encoding apparatus comprising: a prediction mode determination unit that reads a prediction sample value stored in the prediction sample value storage unit and determines a prediction mode to be applied to encoding of a block to be encoded. A moving picture coding program to be executed by a computer for realizing a moving picture coding apparatus that performs moving picture coding with intra-screen predictive coding,
Said computer,
Encoded block pixel value storage means for storing the pixel value of the encoded block;
Means for calculating a prediction sample value corresponding to each prediction mode of the encoding target block based on the pixel value of the encoded block near the encoding target block stored in the encoded block pixel value storage means; A prediction sample value calculating means for calculating a prediction sample value that is a common value for at least two prediction modes among prediction modes that can be selected;
Predicted sample value storage means for storing and holding the calculated predicted sample value;
A moving picture encoding program for reading a prediction sample value stored in the prediction sample value storage unit and functioning as a prediction mode determination unit that determines a prediction mode to be applied to encoding of a block to be encoded. A computer-readable program recording medium that records a moving picture coding program to be executed by a computer for realizing a moving picture coding apparatus that performs moving picture coding with intra-screen predictive coding,
Said computer,
Encoded block pixel value storage means for storing the pixel value of the encoded block;
Means for calculating a prediction sample value corresponding to each prediction mode of the encoding target block based on the pixel value of the encoded block near the encoding target block stored in the encoded block pixel value storage means; A prediction sample value calculating means for calculating a prediction sample value that is a common value for at least two prediction modes among prediction modes that can be selected;
Predicted sample value storage means for storing and holding the calculated predicted sample value;
A program for reading a prediction sample value stored in the prediction sample value storage means and functioning as a prediction mode determination means for determining a prediction mode to be applied to encoding of a coding target block is recorded. A moving image encoding program recording medium.

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