Color image encoding and decoding method and apparatus using a correlation between chrominance components

• US 20060146191A1
• Filed: 09/07/2005
• Published: 07/06/2006
• Est. Priority Date: 12/30/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Jeong-hoon, Lee, Sang-rae, Sohn, Yu-mi, Kim, So-young, Park, Seung-ran
• Granted Patent: US 7,970,219 B2
• Time in Patent Office: Days
• US Class Current: 348/557
• CPC Class Codes: H04N 19/109 among a plurality of temporal predictive coding modes
• CPC Class Codes: H04N 19/147 according to rate distortion criteria rate-distortion as a criterion for motion estimation H04N19/567
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/186 the unit being a colour or a chrominance component
• CPC Class Codes: H04N 19/19 using optimisation based on Lagrange multipliers
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/93 Run-length coding

Abstract

A color image encoding and decoding method and apparatus use a correlation between chrominance components in order to improve coding efficiency. The color image decoding method includes: transforming chrominance components of a color image in each of two or more inter-prediction modes, calculating costs for the conversion values in each of the two or more inter-prediction modes using a predetermined cost function, selecting one of the two or more inter-prediction modes based on the calculation result, and outputting conversion values of the selected inter-prediction mode; entropy encoding the output conversion values.

Claims

1. An encoding apparatus comprising:

a chrominance component transformer which generates a plurality of conversion values by multiplying chrominance components Cb and Cr of color video by predetermined coefficients and combining multiplication results, selects two of the conversion values having lowest costs calculated by a predetermined cost function, and outputs the two conversion values which are selected; and

an entropy coder performing entropy coding on the two conversion values.

2. The encoding apparatus of claim 1, wherein the chrominance components Cb and Cr are transformed and quantized chrominance components.

3. The encoding apparatus of claim 1, further comprising:

a transformer which transforms the conversion values which are output from the chrominance component transformer; and

a quantizer which quantizes the conversion values which are output from the transformer.

4. The encoding apparatus of claim 1, further comprising a motion estimator and a motion compensator which perform inter-prediction.

5. The encoding apparatus of claim 1, wherein the chrominance component transformer generates the conversion values using the following equation:

conversion value=a×

Cb+b×

Cr+c

wherein a, b and c are predetermined coefficients and a plurality of sets of (a, b, c) are predetermined.

6. The encoding apparatus of claim 1, wherein the predetermined cost function is one of a rate-distortion cost function, a sum of absolute difference value function, a sum of absolute transformed difference function, a sum of squared difference function, and a mean of absolute difference function.

7. The encoding apparatus of claim 1, wherein the chrominance component transformer comprises:

a conversion value calculator which generates the conversion values by multiplying the chrominance components Cb and Cr by coefficients of a plurality of sets of coefficients, and combining the multiplication results;

a cost calculator which calculates costs of the conversion values using the predetermined cost function; and

a determiner which selects and outputs the two conversion values having the lowest costs.

8. The encoding apparatus of claim 1, wherein the chrominance component transformer run-length codes information on sets of predetermined coefficients corresponding to the two conversion values having the two lowest costs.

9. An encoding method comprising:

generating a plurality of conversion values by multiplying chrominance components Cb and Cr of color video by predetermined coefficients and combining multiplication results;

selecting two of the conversion values having lowest costs calculated by a predetermined cost function; and

performing entropy coding on the two conversion values which are selected.

10. The encoding method of claim 9, wherein the chrominance components Cb and Cr are transformed and quantized chrominance components.

11. The encoding method of claim 9, further comprising transforming and quantizing the conversion values, if the chrominance components Cb and Cr are non-transformed and non-quantized chrominance components.

12. The encoding method of claim 9, further comprising performing motion prediction and motion compensation for inter-prediction.

13. The encoding method of claim 9, wherein the conversion values are generated using the following equation:

conversion value=a×

Cb+b×

Cr+c

wherein a, b and c are predetermined coefficients and a plurality of sets of (a, b, c) are predetermined by a user.

14. The encoding method of claim 9, wherein the predetermined cost function is one of a rate-distortion cost function, a sum of absolute value function, a sum of absolute transformed difference function, a sum of squared difference function, and a mean of absolute difference function.

15. The encoding method of claim 9, wherein the generating the plurality of conversion values comprises:

multiplying the chrominance components Cb and Cr by coefficients of a plurality of sets of coefficients, and combining the multiplication results with the coefficient c; and

calculating the costs of the conversion values using the predetermined cost function;

coefficients a and b of a plurality of sets of coefficients (a, b, c), and combines the multiplication results with the coefficient c.

16. The encoding method of claim 9, wherein information on sets of coefficients corresponding to the two conversion values having the two lowest costs is run-length coded.

17. A decoding apparatus comprising:

an entropy decoder which entropy-decodes an encoded bitstream and outputs decoded data; and

a chrominance component inverse transformer which bypasses the decoded data if the decoded data is a luminance component, and extracts information on coefficients which are multiplied and combined with chrominance components Cb and Cr, to generate and output the chrominance components Cb and Cr if the decoded data is chrominance components.

18. The decoding apparatus of claim 17, further comprising:

an inverse quantizer which inverse-quantizes the decoded data; and

an inverse transformer which inverse-transforms the decoded data.

19. The decoding apparatus of claim 17, further comprising a motion compensator which performs inter-prediction.

20. The decoding apparatus of claim 17, wherein the chrominance component inverse transformer extracts information indicating which set of coefficients is used to encode the chrominance components Cb and Cr, in order to generate the chrominance components Cb and Cr, the information being run-length coded and transmitted.

21. A decoding method comprising:

entropy-decoding an encoded bitstream to generate decoded data;

bypassing the decoded data if the decoded data is a luminance component; and

extracting information on coefficients which are multiplied and combined with chrominance components Cb and Cr, to generate and output the chrominance components Cb and Cr if the decoded data is chrominance components.

22. The decoding method of claim 21, further comprising inverse-quantizing and inverse-transforming the decoded data.

23. The decoding method of claim 21, further comprising performing motion compensation for inter-prediction.

24. The decoding method of claim 21, wherein information indicating which set of coefficients is used to encode the chrominance components Cb and Cr is extracted to generate the chrominance components Cb and Cr, the information being run-length coded and transmitted.

25. An encoding apparatus for encoding a color image, the encoding apparatus comprising:

a chrominance component transformer which transforms chrominance components of a color image in each of at least two inter-prediction modes, calculates costs for conversion values in each of the at least two inter-prediction modes using a predetermined cost function, selects one of the at least two inter-prediction modes based on the costs, and outputs conversion values of the inter-prediction mode which is selected; and

an entropy encoder which entropy encodes the conversion values which are output by the chrominance component transformer.

26. The encoding apparatus of claim 25, wherein the chrominance component transformer selects of one of the at least two inter-prediction modes in a unit of a predetermined macroblock, wherein information on the inter-prediction mode selected for the predetermined macroblock is coded in a unit of a predetermined group comprising a plurality of blocks.

27. The encoding apparatus of claim 26, wherein the information on the inter-prediction mode for the plurality of blocks of the predetermined group is classified into a plurality of mode planes, and the plurality of mode planes are coded.

28. The encoding apparatus of claim 27, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks.

29. The encoding apparatus of claim 27, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

30. The encoding apparatus of claim 26, wherein inter-prediction mode information for the plurality of blocks of the predetermined group is classified into a plurality of mode planes in each mode, the plurality of mode planes are arranged in a determined order, information on a next mode plane is transformed based on mode information on a previous mode plane, and the transformed mode plane is coded.

31. The encoding apparatus of claim 30, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks, and the next mode plane is transformed by deleting information on a block to which an inter-prediction mode of the previous mode plane is applied from information on the next mode plane based on information on the previous mode plane.

32. The encoding apparatus of claim 31, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

33. The encoding apparatus of claim 32, wherein the deleting the information on the block to which the inter-prediction mode of the previous mode plane is applied is achieved by setting the information on the block to “

0.”

34. The encoding apparatus of claim 26, wherein the plurality of blocks are macroblocks, and the predetermined group is a picture.

35. The encoding apparatus of claim 25, wherein the chrominance components are Cb and Cr which are pre-transformed and pre-quantized.

36. The encoding apparatus of claim 25, further comprising:

a transformer which transforms the conversion values output from the chrominance component transformer; and

a quantizer which quantizes the conversion values output from the transformer.

37. The encoding apparatus of claim 25, further comprising a motion estimator and a motion compensator performing an inter-prediction.

38. The encoding apparatus of claim 25, wherein the predetermined cost function is one of a rate-distortion cost function, a sum of absolute difference value function, a sum of absolute transformed difference function, a sum of squared difference function, and a mean of absolute difference function.

39. The encoding apparatus of claim 25, wherein the chrominance component transformer comprises:

an inter-prediction mode table storage which stores an inter-prediction mode table comprising the at two inter-prediction modes;

a conversion value calculator which calculates conversion values of chrominance components Cb and Cr of a color image in each of the at least two inter-prediction modes based on the inter-prediction mode table; and

a mode selector which selects an inter-prediction mode in which the conversion values have lowest costs calculated by the predetermined cost function.

40. The encoding apparatus of claim 25, further comprising:

a run-length coder which run-length codes information on the inter-prediction mode which is selected.

41. An encoding method for encoding a color image, the encoding method comprising:

transforming chrominance components of a color image in each of at least two inter-prediction modes;

calculating costs for conversion values in each of the at least two inter-prediction modes using a predetermined cost function;

selecting one of the at least two inter-prediction modes based on the costs ; and

entropy encoding the output conversion values of the inter-prediction mode which is selected.

42. The encoding method of claim 41, wherein the selecting one of the at least two inter-prediction modes is performed in a unit of a predetermined macroblock, wherein information on the inter-prediction mode selected for the predetermined macroblock is coded in a unit of a predetermined group comprising a plurality of blocks.

43. The encoding method of claim 42, wherein the information on the inter-prediction mode for the plurality of blocks of the predetermined group is classified into a plurality of mode planes, and the plurality of mode planes are coded.

44. The encoding method of claim 43, wherein the mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks.

45. The encoding method of claim 43, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

46. The encoding method of claim 42, wherein inter-prediction mode information for the plurality of blocks of the predetermined group is classified into a plurality of mode planes in each mode, the plurality of mode planes are arranged in a determined order, information on a next mode plane is transformed based on mode information on a previous mode plane, and the transformed mode plane is coded.

47. The encoding method of claim 46, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks, and the next mode plane is transformed by deleting information on a block to which an inter-prediction mode of the previous mode plane is applied from information on the next mode plane based on information on the previous mode plane.

48. The encoding method of claim 47, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

49. The encoding method of claim 48, wherein the deleting the information on the block to which the inter-prediction mode of the previous mode plane is applied is achieved by setting the information on the block to “

0.”

50. The encoding method of claim 42, wherein the plurality of blocks are macroblocks, and the predetermined group is a picture.

51. The encoding method of claim 41, wherein the chrominance components are Cb and Cr which are pre-transformed and pre-quantized.

52. The encoding method of claim 41, further comprising transforming and quantizing the conversion values of the inter-prediction mode which is selected if the chrominance components comprise values which are not transformed and quantized.

53. The encoding method of claim 41, further comprising performing an inter-prediction.

54. The encoding method of claim 41, wherein the predetermined cost function is one of a rate-distortion cost function, a sum of absolute difference value function, a sum of absolute transformed difference function, a sum of squared difference function, and a mean of absolute difference function.

55. The encoding method of claim 41, further comprising calculating conversion values of chrominance components Cb and Cr of a color image in each mode, wherein the selecting one of the at least two inter-prediction modes comprises selecting an inter-prediction mode in which the conversion values have lowest costs calculated by the predetermined cost function.

56. The encoding method of claim 41, further comprising run-length coding information on the inter-prediction mode which is selected.

57. A decoding apparatus for decoding an encoded color image, the decoding apparatus comprising:

an entropy decoder which entropy decodes an input bitstream; and

a chrominance component inverse transformer which recovers original chrominance components based on inter-prediction mode information applied to a current block having a predetermined size, the inter-prediction mode information being extracted from the input bitstream,

wherein the inter-prediction mode information indicates an inter-prediction mode which selected from among at least two inter-prediction modes and is applied to the current block, and the original chrominance components are obtained from conversion values corresponding to the inter-prediction mode applied to the current block.

58. The decoding apparatus of claim 57, wherein the inter-prediction mode information extracted from the input bitstream is a plurality of mode planes into which inter-prediction mode information for a plurality of blocks is classified in each mode.

59. The decoding apparatus of claim 58, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks.

60. The decoding apparatus of claim 58, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

61. The decoding apparatus of claim 58, wherein the inter-prediction mode information extracted from the input bitstream is a transformed mode plane generated by classifying inter-prediction mode information for the plurality of blocks of the predetermined group into a plurality of mode planes in each mode, arranging the plurality of mode planes in a determined order, and transforming information on a next mode plane based on mode information on a previous mode plane.

62. The decoding apparatus of claim 61, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks, and the next mode plane is transformed by deleting information on a block to which an inter-prediction mode of the previous mode plane is applied from information on the next mode plane based on information on the previous mode plane,

wherein the decoding apparatus decodes the transformed mode planes in the determined order to recover original mode planes.

63. The decoding apparatus of claim 61, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

64. The decoding apparatus of claim 63, wherein the deletion of the information on the block to which the inter-prediction mode of the previous mode plane is applied is achieved by setting the information on the block to “

0.”

65. The decoding apparatus of claim 58, wherein the current block having the predetermined size is a macroblock, and the mode planes comprise inter-prediction mode information for a macroblock of a picture unit.

66. The decoding apparatus of claim 57, wherein the chrominance components are Cb and Cr.

67. The decoding apparatus of claim 57, further comprising:

an inverse quantizer inverse-quantizes decoded data; and

an inverse transformer which inverse-transforms the decoded data.

68. The decoding apparatus of claim 57, further comprising a motion compensator which performs an inter-prediction.

69. The decoding apparatus of claim 58, wherein the decoding apparatus extracts inter-prediction mode information coded and transmitted according to a run-length coding method to calculate the chrominance components based on the inter-prediction mode information.

70. A decoding method for decoding a color image, the decoding method comprising:

entropy decoding an input bitstream; and

recovering original chrominance components based on inter-prediction mode information applied to a current block having a predetermined size, the inter-prediction mode information being extracted from the input bitstream,

wherein the inter-prediction mode information indicates an inter-prediction mode which is selected from among at least two inter-prediction modes and is applied to the current block, and the original chrominance components are obtained from conversion values corresponding to the inter-prediction mode applied to the current block.

71. The decoding method of claim 70, wherein the inter-prediction mode information extracted from the input bitstream is a plurality of mode planes into which inter-prediction mode information for a plurality of blocks is classified in each mode.

72. The decoding method of claim 71, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks.

73. The decoding method of claim 71, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

74. The decoding method of claim 71, wherein the inter-prediction mode information extracted from the input bitstream is a transformed mode plane generated by classifying inter-prediction mode information for the plurality of blocks of the predetermined group into a plurality of mode planes in each mode, arranging the plurality of mode planes in a determined order, and transforming information on a next mode plane based on mode information on a previous mode plane.

75. The decoding method of claim 74, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks, and the next mode plane is transformed by deleting information on a block to which an inter-prediction mode of the previous mode plane is applied from information on the next mode plane based on information on the previous mode plane,

wherein the transformed mode planes are decoded in the determined order to recover original mode planes.

76. The decoding method of claim 75, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

77. The decoding method of claim 76, wherein the deleting the information on the block to which the inter-prediction mode of the previous mode plane is applied is achieved by setting the information on the block to “

0.”

78. The decoding method of claim 71, wherein the current block having the predetermined size is a macroblock, and the mode planes comprise inter-prediction mode information for a macroblock of a picture unit.

79. The decoding method of claim 70, wherein the chrominance components are Cb and Cr.

80. The decoding method of claim 70, further comprising inverse-quantizing and inverse-transforming decoded data.

81. The decoding method of claim 70, further comprising performing an inter-prediction.

82. The decoding method of claim 71, wherein inter-prediction mode information coded and transmitted according to a run-length coding method is extracted to calculate the chrominance components based on the inter-prediction mode information.

83. A computer-readable recording medium having embodied thereon a computer program for performing an encoding method, the encoding method comprising:

generating a plurality of conversion values by multiplying chrominance components Cb and Cr of color video by predetermined coefficients and combining multiplication results;

selecting two of the conversion values having lowest costs calculated by a predetermined cost function; and

performing entropy coding on the two conversion values which are selected.

84. A computer-readable recording medium having embodied thereon a computer program for performing an encoding method for encoding a color image, the encoding method comprising:

transforming chrominance components of a color image in each of at least two inter-prediction modes;

calculating costs for conversion values in each of the at least two inter-prediction modes using a predetermined cost function;

selecting one of the at least two inter-prediction modes based on the costs; and

entropy encoding the output conversion values of the inter-prediction mode which is selected.

85. The computer-readable recording medium of claim 84, wherein the selecting one of the least two inter-prediction modes is performed in a unit of a predetermined macroblock, wherein information on the inter-prediction mode selected fro the predetermined macroblock is coded in a unit of a predetermined group comprising a plurality of blocks.

86. The computer-readable recording medium of claim 85, wherein the information on the inter-prediction mode for the plurality of blocks of the predetermined group is classified into a plurality of mode planes, and the plurality of mode planes are coded.

87. The computer-readable recording medium of claim 86, wherein the mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks.

88. The computer-readable recording medium of claim 86, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

89. The computer-readable recording medium of claim 85, wherein inter-prediction mode information for the plurality of blocks of the predetermined group is classified into a plurality of mode planes in each mode, the plurality of mode planes are arranged in a determined order, information on a next mode plane is transformed based on mode information on a previous mode plane, and the transformed mode plane is coded.

90. The computer-readable recording medium of claim 89, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks, and the next mode plane is transformed by deleting information on a block to which an inter-prediction mode of the previous mode plane is applied from information on the next mode plane based on information on the previous mode plane.

91. The computer-readable recording medium of claim 90, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

92. The computer-readable recording medium of claim 91, wherein the deleting the information on the block to which the inter-prediction mode of the previous mode plane is applied is achieved by setting the information on the block to “

0.”

93. A computer-readable recording medium having embodied thereon a computer program for performing a decoding method, the decoding method comprising:

entropy-decoding an encoded bitstream to generate decoded data;

bypassing the decoded data if the decoded data is a luminance component; and

extracting information on coefficients which are multiplied and combined with chrominance components Cb and Cr, to generate and output the chrominance components Cb and Cr if the decoded data is chrominance components.

94. A computer-readable recording medium having embodied thereon a computer program for performing a decoding method for decoding a color image, the decoding method comprising:

entropy decoding an input bitstream; and

recovering original chrominance components based on inter-prediction mode information applied to a current block having a predetermined size, the inter-prediction mode information being extracted from the input bitstream,

wherein the inter-prediction mode information indicates an inter-prediction mode which is selected from among at least two inter-prediction modes and is applied to the current block, and the original chrominance components are obtained from conversion values corresponding to the inter-prediction mode applied to the current block.

95. The computer-readable recording medium of claim 94, wherein the inter-prediction mode information extracted from the input bitstream is a plurality of mode planes into which inter-prediction mode information for a plurality of blocks is classified in each mode.

96. The computer-readable recording medium of claim 95, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks.

97. The computer-readable recording medium of claim 95, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

98. The computer-readable recording medium of claim 95, wherein the inter-prediction mode information extracted from the input bitstream is a transformed mode plane generated by classifying inter-prediction mode information for the plurality of blocks of the predetermined group into a plurality of mode planes in each mode, arranging the plurality of mode planes in a determined order, and transforming information on a next mode plane based on mode information on a previous mode plane.

99. The computer-readable recording medium of claim 98, wherein the plurality of mode planes comprise information on whether an inter-prediction mode corresponding to a current mode plane is applied to each of the plurality of blocks, and the next mode plane is transformed by deleting information on a block to which an inter-prediction mode of the previous mode plane is applied from information on the next mode plane based on information on the previous mode plane,

wherein the transformed mode planes are decoded in the determined order to recover original mode planes.

100. The computer-readable recording medium of claim 99, wherein a predetermined mode plane is obtained by setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is applied to “

1” and

setting mode information corresponding to a block to which the inter-prediction mode corresponding to the current mode plane is not applied to “

0.”

101. The computer-readable recording medium of claim 100, wherein the deleting the information on the block to which the inter-prediction mode of the previous mode plane is applied is achieved by setting the information on the block to “

0.”