RU2021126223A - CODING COEFFICIENTS FOR TRANSFORM SKIP MODE - Google Patents

Claims (144)

1. A method for decoding video data, the method comprising the steps of: - for the residual block of video data encoded using the transform skipping mode, determine the value for the first adjacent coefficient relative to the coefficient currently being decoded; - determine the value for the second neighboring coefficient with respect to the coefficient currently being decoded; - determining a context offset for the coefficient currently being decoded based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; And - decoding the value for the coefficient currently being decoded based on the determined context offset. 2. The method of claim 1, wherein the first neighbor coefficient comprises one of the upper neighbor coefficient or left neighbor coefficient of the coefficient currently being decoded, and the second neighboring coefficient comprises the other of the upper neighboring coefficient or left neighbor coefficient. 3. The method of claim 1, wherein decoding a value for the coefficient currently being decoded based on the determined context offset comprises: - determine the context based on the determined context offset; - receive one or more data bins; And - context decoding one or more data bins based on the determined context to determine the sign for the coefficient currently being decoded. 4. The method of claim 3, wherein decoding a value for the coefficient currently being decoded based on the determined context offset further comprises: - determining a predicted level value for the coefficient currently being decoded based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; - take a syntax element indicating; - in response to a syntax element having a value equal to one, it is determined that the level value of the coefficient currently being decoded is equal to the predicted level value. 5. The method of claim 3, wherein decoding a value for the coefficient currently being decoded based on the determined context offset further comprises: - determining a predicted level value for the coefficient currently being decoded based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; - take a syntax element indicating; - in response to a value for the syntax element greater than the predicted level value, it is determined that the level value of the coefficient currently being decoded is equal to the value for the syntax element plus one. 6. The method of claim 3, wherein decoding a value for the coefficient currently being decoded based on the determined context offset further comprises: - determining a predicted level value for the coefficient currently being decoded based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; - take a syntax element indicating; - in response to a value for the syntax element that is less than the predicted level value, it is determined that the value of the level of the coefficient currently being decoded is equal to the value for the syntax element. 7. The method of claim 1, wherein determining a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises selecting a context offset from three available context offsets based on the value for the first neighbor coefficient and a value for the second neighbor coefficient, the three available context offsets being: - the first context offset for when the first neighboring coefficient and the second neighboring coefficient are equal to zero or have opposite signs; - a second context bias for when the first neighboring coefficient and the second neighboring coefficient are positive, or one of the first neighboring coefficient and the second neighboring coefficient is zero and the other of the first neighboring coefficient and the second neighboring coefficient is positive; And - a third context bias for when the first neighboring coefficient and the second neighboring coefficient are negative, or one of the first neighboring coefficient and the second neighboring coefficient is zero and the other of the first neighboring coefficient and the second neighboring coefficient is negative. 8. The method of claim 1, wherein determining a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighbor coefficient equal to zero, and a value for the second neighbor coefficient equal to zero. 9. The method of claim 1, wherein determining a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighbor coefficient being one of greater than zero or less than zero; and a value for the second neighbor coefficient being the other of greater than zero or less than zero. 10. The method of claim 1, wherein determining a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response on the value for the first neighboring coefficient and the value for the second neighboring coefficient, which are non-zero values and have opposite signs. 11. The method of claim 1, wherein determining a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighboring coefficient greater than or equal to zero, and a value for the second neighboring coefficient greater than or equal to zero, wherein at least one of the value for the first neighboring coefficient or the value for the second neighboring coefficient is greater than or equal to one. 12. The method of claim 1, wherein determining a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighbor coefficient and a value for the second neighbor coefficient, which are non-negative values. 13. The method of claim 1, wherein determining a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, setting the context offset value to a specific offset value in response to the value for the first neighboring coefficient less than or equal to zero, and the value for the second neighboring coefficient less than or equal to zero, while the value for the first neighboring coefficient or the value for the second neighboring coefficient is less than or equal to negative one (-1). 14. The method of claim 1, further comprising the steps of: - inversely quantize, without inverse transformation, the value for the coefficient currently being decoded to determine the residual value for the residual block of video data. 15. The method according to claim 1, further comprising the steps of: - determine the decoded residual block based on the value for the coefficient, currently decoded; summing the decoded residual block with the prediction block to determine a recovered block; - performing one or more filtering operations on the reconstructed block in order to determine the decoded block of video data; And outputting a decoded video data frame that includes the decoded video data block. 16. A method for encoding video data, the method comprising the steps of: - for the residual block of video data encoded using the skip transform mode, determine the value for the first adjacent coefficient relative to the coefficient currently being encoded; - determine the value for the second neighboring coefficient with respect to the coefficient currently encoded; - determine the context offset for the coefficient currently encoded, based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; And - encode the value for the coefficient currently being encoded, based on the determined context offset. 17. The method of claim 16, wherein the first neighbor coefficient comprises one of the upper neighbor coefficient or left neighbor coefficient and the second neighboring coefficient comprises the other of the upper neighboring coefficient or left neighbor coefficient. 18. The method of claim 16, wherein encoding a value for the coefficient currently being encoded based on the determined context offset comprises: - determine the context based on the determined context offset; - determine the sign for the coefficient currently encoded; And - context-encoding one or more data bins based on a specific context to represent the sign for the coefficient currently being encoded. 19. The method of claim 18, wherein encoding a value for the coefficient currently being encoded based on the determined context offset further comprises: - determining a predicted level value for the coefficient currently being encoded based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; - in response to the coefficient level value currently being encoded equal to the predicted level value, the syntax element is encoded with a value equal to one. 20. The method of claim 18, wherein encoding a value for the coefficient currently being encoded based on the determined context offset further comprises: - determining a predicted level value for the coefficient currently being encoded based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; - in response to a coefficient level value currently being encoded that is less than a predicted level value, the syntax element is encoded with a value equal to the coefficient level value currently being encoded. 21. The method of claim 18, wherein encoding a value for the coefficient currently being encoded based on the determined context offset further comprises: - determining a predicted level value for the coefficient currently being encoded based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; - in response to a coefficient level value currently being encoded that is greater than the predicted level value, the syntax element is encoded with a value equal to the coefficient level value currently being encoded minus one. 22. The method of claim 16, wherein determining a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises selecting a context offset from three available context offsets based on the value for the first neighbor coefficient and a value for the second neighbor coefficient, the three available context offsets being: - the first context offset for when the first neighboring coefficient and the second neighboring coefficient are equal to zero or have opposite signs; - a second context bias for when the first neighboring coefficient and the second neighboring coefficient are positive, or one of the first neighboring coefficient and the second neighboring coefficient is zero and the other of the first neighboring coefficient and the second neighboring coefficient is positive; And - a third context bias for when the first neighboring coefficient and the second neighboring coefficient are negative, or one of the first neighboring coefficient and the second neighboring coefficient is zero and the other of the first neighboring coefficient and the second neighboring coefficient is negative. 23. The method of claim 16, wherein determining a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighbor coefficient equal to zero, and a value for the second neighbor coefficient equal to zero. 24. The method of claim 16, wherein determining a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighbor coefficient being one of greater than zero or less than zero; and a value for the second neighbor coefficient being the other of greater than zero or less than zero. 25. The method of claim 16, wherein determining a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighbor coefficient and a value for the second neighbor coefficient, which are non-zero values and have opposite signs. 26. The method of claim 16, wherein determining a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighboring coefficient greater than or equal to zero, and a value for the second neighboring coefficient greater than or equal to zero, wherein at least one of the value for the first neighboring coefficient or the value for the second neighboring coefficient is greater than or equal to one. 27. The method of claim 16, wherein determining a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighbor coefficient and a value for the second neighbor coefficient, which are non-negative values. 28. The method of claim 16, wherein determining a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient comprises setting the context offset value to a specific offset value in response to a value for the first neighbor coefficient less than or equal to zero, and a value for the second neighbor coefficient less than or equal to zero, wherein the value for the first neighbor coefficient or the value for the second neighbor coefficient is less than or equal to negative one. 29. The method of claim 16, further comprising the step of: - quantize the residual value for the residual block of video data to determine the value for the coefficient currently encoded. 30. The method of claim 16, further comprising the steps of: - determine the prediction block; And - comparing the prediction block with the original video data block to determine the residual video data block. 31. Device for decoding video data, wherein the device contains: - a storage device configured to store video data; And - one or more processors implemented in the circuit and configured to: - for the residual block of video data encoded using the transform-skip mode, determine the value for the first neighboring coefficient relative to the coefficient currently being decoded; - to determine the value for the second neighboring coefficient with respect to the coefficient currently being decoded; - determine the context offset for the coefficient currently being decoded, based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; And - decode the value for the coefficient currently being decoded based on the determined context offset. 32. The apparatus of claim 31, wherein the first neighbor coefficient comprises one of the upper neighbor coefficient or left neighbor coefficient and the second neighboring coefficient comprises the other of the upper neighboring coefficient or left neighbor coefficient. 33. The apparatus of claim 31, wherein in order to decode a value for the coefficient currently being decoded based on the determined context offset, the one or more processors are further configured to: - determine the context based on a certain context bias; - receive one or more data beans; And - contextually decode one or more data bins based on the determined context to determine the sign for the coefficient currently being decoded. 34. The apparatus of claim 31, wherein in order to determine a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, one or more processors are further configured to select a context offset of the three available context offsets based on the value for the first neighbor coefficient and the value for the second neighbor coefficient, the three available context offsets being: - the first context offset for when the first neighboring coefficient and the second neighboring coefficient are equal to zero or have opposite signs; - a second context bias for when the first neighboring coefficient and the second neighboring coefficient are positive, or one of the first neighboring coefficient and the second neighboring coefficient is zero and the other of the first neighboring coefficient and the second neighboring coefficient is positive; And - a third context bias for when the first neighboring coefficient and the second neighboring coefficient are negative, or one of the first neighboring coefficient and the second neighboring coefficient is zero and the other of the first neighboring coefficient and the second neighboring coefficient is negative. 35. The apparatus of claim 31, wherein in order to determine a context offset for a coefficient currently being decoded based on a value for the first neighbor coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to set a context value. offset equal to a particular offset value in response to a value for the first neighbor coefficient being zero and a value for the second neighbor coefficient being zero. 36. The apparatus of claim 31, wherein in order to determine a context offset for a coefficient currently being decoded based on a value for the first neighbor coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to set a context value. offset equal to a specific offset value in response to a value for the first neighbor coefficient being one of greater than zero or less than zero, and a value for the second neighbor coefficient being the other of greater than zero or less than zero. 37. The apparatus of claim 31, wherein in order to determine a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to set a value of the context offset equal to a specific offset value in response to the value for the first neighboring coefficient and the value for the second neighboring coefficient, which are non-zero values and have opposite signs. 38. The apparatus of claim 31, wherein in order to determine a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to set the value of the context offset equal to a particular offset value in response to a value for the first neighboring coefficient greater than or equal to zero and a value for the second neighboring coefficient greater than or equal to zero, wherein at least one of the value for the first neighboring coefficient or the value for the second neighboring coefficient is greater than or equal to one. 39. The apparatus of claim 31, wherein in order to determine a context offset for a coefficient currently being decoded based on a value for the first neighbor coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to set a context value. offset equal to a specific offset value in response to the value for the first neighboring coefficient and the value for the second neighboring coefficient, which are non-negative values. 40. The apparatus of claim 31, wherein in order to determine a context offset for a coefficient currently being decoded based on a value for the first neighbor coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to set a context value. offset equal to a specific offset value in response to a value for the first neighboring coefficient less than or equal to zero, and a value for the second neighboring coefficient less than or equal to zero, while the value for the first neighboring coefficient or the value for the second neighboring coefficient is less than or equal to negative one ( -1). 41. The apparatus of claim 31, wherein the one or more processors are further configured to: - inversely quantize the value for the coefficient currently being decoded to determine the residual value for the residual block of video data. 42. The apparatus of claim 31, wherein the one or more processors are further configured to: - determine the decoded residual block based on the value for the coefficient currently being decoded; - sum the decoded transform block with the prediction block to determine the reconstructed block; - perform one or more filtering operations on the reconstructed block in order to determine the decoded block of video data; And - to output a decoded frame of video data, which includes a decoded block of video data. 43. The apparatus of claim 31, wherein the apparatus comprises a wireless communication device, the wireless communication device further comprising a receiver configured to receive encoded video data. 44. The apparatus of claim. 43, wherein the wireless communication device comprises a handset, and wherein the receiving device is configured to demodulate, according to a wireless communication standard, a signal containing encoded video data. 45. The device according to claim 31, further comprising: - a display configured to display the decoded video data. 46. The apparatus of claim 31, wherein the apparatus comprises one or more of a camera, a computer, a mobile device, a broadcast receiver, or a set-top box. 47. Device for encoding video data, wherein the device contains: - a storage device configured to store video data; And - one or more processors implemented in the circuit and configured to: - for the residual block of video data encoded using the transform-skip mode, to determine the value for the first adjacent coefficient relative to the coefficient currently being encoded; - to determine the value for the second neighboring coefficient with respect to the coefficient currently encoded; - determine the context offset for the coefficient currently being encoded, based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; And - encode the value for the coefficient currently being encoded based on the defined context offset. 48. The apparatus of claim 47, wherein the first neighbor coefficient comprises one of the upper neighbor coefficient or left neighbor coefficient and the second neighboring coefficient comprises the other of the upper neighboring coefficient or left neighbor coefficient. 49. The apparatus of claim 47, wherein in order to encode a value for the coefficient currently being encoded based on the determined context offset, the one or more processors are further configured to: - determine the context based on a certain context bias; - determine the sign for the coefficient currently being encoded; And - context-encode one or more data bins based on a specific context to represent the sign for the coefficient currently being encoded. 50. The apparatus of claim 47, wherein in order to determine a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, one or more processors are further configured to select a context offset of the three available context offsets based on the value for the first neighbor coefficient and the value for the second neighbor coefficient, the three available context offsets being: - the first context offset for when the first neighboring coefficient and the second neighboring coefficient are equal to zero or have opposite signs; - a second context bias for when the first neighboring coefficient and the second neighboring coefficient are positive, or one of the first neighboring coefficient and the second neighboring coefficient is zero and the other of the first neighboring coefficient and the second neighboring coefficient is positive; And - a third context bias for when the first neighboring coefficient and the second neighboring coefficient are negative, or one of the first neighboring coefficient and the second neighboring coefficient is zero and the other of the first neighboring coefficient and the second neighboring coefficient is negative. 51. The apparatus of claim 47, wherein in order to determine a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to specify a context value. offset equal to a particular offset value in response to a value for the first neighbor coefficient being zero and a value for the second neighbor coefficient being zero. 52. The apparatus of claim 47, wherein in order to determine a context offset for a coefficient currently being encoded based on a value for the first neighbor coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to specify a context value. offset equal to a specific offset value in response to a value for the first neighbor coefficient being one of greater than zero or less than zero, and a value for the second neighbor coefficient being the other of greater than zero or less than zero. 53. The apparatus of claim 47, wherein in order to determine a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to set a context value. offset equal to a specific offset value in response to the value for the first neighboring coefficient and the value for the second neighboring coefficient, which are non-zero values and have opposite signs. 54. The apparatus of claim 47, wherein in order to determine a context offset for a coefficient currently being encoded based on a value for the first neighbor coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to specify a context value. offset equal to a specific offset value in response to a value for the first neighboring coefficient greater than or equal to zero, and a value for the second neighboring coefficient greater than or equal to zero, wherein at least one of the value for the first neighboring coefficient or the value for the second neighboring coefficient is greater than or equal to one. 55. The apparatus of claim 47, wherein in order to determine a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to specify a context value. offset equal to a specific offset value in response to the value for the first neighboring coefficient and the value for the second neighboring coefficient, which are non-negative values. 56. The apparatus of claim 47, wherein in order to determine a context offset for a coefficient currently being encoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient, the one or more processors are further configured to specify a context value. offset equal to a specific offset value in response to a value for the first neighboring coefficient less than or equal to zero, and a value for the second neighboring coefficient less than or equal to zero, while the value for the first neighboring coefficient or the value for the second neighboring coefficient is less than or equal to negative one ( -1). 57. The apparatus of claim 47, wherein the one or more processors are further configured to: - quantize the residual value for the residual block of video data to determine the value for the coefficient currently being encoded. 58. The apparatus of claim 47, wherein the one or more processors are further configured to: - determine the forecasting block; And - compare the prediction block with the original video block to determine the residual video block. 59. Equipment for decoding video data, and the equipment contains: means for determining, for the residual block of video data encoded using the transform-skip mode, a value for the first neighbor coefficient relative to the coefficient currently being decoded; means for determining a value for a second neighbor coefficient relative to the coefficient currently being decoded; means for determining a context offset for a coefficient currently being decoded based on a value for the first neighboring coefficient and a value for the second neighboring coefficient; And means for decoding a value for the coefficient currently being decoded based on the determined context offset. 60. A computer-readable storage medium that stores instructions that, when executed by one or more processors, instructs one or more processors: - to determine, for the residual block of video data encoded using the transform skipping mode, the value for the first neighboring coefficient relative to the coefficient currently being decoded; - to determine the value for the second neighboring coefficient with respect to the coefficient currently being decoded; - determine the context offset for the coefficient currently being decoded, based on the value for the first neighboring coefficient and the value for the second neighboring coefficient; And - decode the value for the coefficient currently being decoded based on the determined context offset.