Encoding and decoding method and corresponding devices
A method for decoding a bitstream representative of a picture is disclosed. Information representative of at least one encoding precision is first determined. A transform is then decoded responsive to the determined information. Finally, the picture is decoded using the decoded transform. A method for encoding a bitstream representative of a picture, as well as encoding devices and decoding devices are also disclosed.
1. A method, comprising:
decoding, from a bitstream, a transform represented by one or more transform vectors;
decoding, from said bitstream, a picture using the decoded transform wherein decoding said transform comprises decoding an information representative of a total count of the number of transform vectors and further comprises for at least one transform vector:
decoding an information representative of a precision for said transform vector, said precision being the number of bits of quantized components of said transform vector;
decoding said quantized components of said transform vector responsive to said precision; and
dequantizing decoded quantized components of said transform vector.
2. The method of claim 1 , wherein said information representative of said precision is a number of bits.
3. The method of claim 1 , wherein said information representative of said precision is a bit decrement.
4. The method of claim 1 , wherein said information representative of said precision is a number of bits for the first transform vector of said transform and a bit decrement for the remaining transform vectors of said transform.
5. A method, comprising:
accessing a transform represented by one or more transform vectors;
encoding said transform in a bitstream;
encoding a picture in the bitstream using the encoded transform wherein encoding said transform in the bitstream comprises encoding (E 38 ) an information representative of a total count of the number of transform vectors and further comprises for at least one transform vector:
encoding an information representative of a precision for said transform vector, said precision being the number of bits of quantized components of said transform vector;
quantizing said components of said transform vector; and
encoding said quantized components of said transform vector responsive to said precision.
6. The method of claim 5 , wherein said information representative of said precision is a number of bits.
7. The method of claim 5 , wherein said information representative of said precision is a bit decrement.
8. The method of claim 5 , wherein said information representative of said precision is a number of bits for the first transform vector of said accessed transform and a bit decrement for the remaining transform vectors of said accessed transform.
9. A decoding device comprising a communication interface configured to access at least a bitstream and at least one processor configured to:
decode, from said accessed bitstream, a transform represented by one or more transform vectors;
decode, from said bitstream, said picture using the decoded transform wherein to decode said transform comprises to decode an information representative of a total count of the number of transform vectors and wherein said at least one processor is further, for at least one transform vector, configured to:
to decode an information representative of a precision for said transform vector, said encoding precision being the number of bits of quantized components of said transform vector;
to decode said quantized components of said transform vector responsive to said precision; and
to dequantize decoded quantized components of said transform vector.
10. The device of claim 9 , wherein said information representative of said precision is a number of bits.
11. The device of claim 9 , wherein said information representative of said precision is a bit decrement.
12. The device of claim 9 , wherein said information representative of said precision is a number of bits for the first transform vector of said transform and a bit decrement for the remaining transform vectors of said transform.
13. An encoding device comprising a communication interface configured to access a picture and at least one processor configured to:
access a transform represented by one or more transform vectors;
encode said transform in a bitstream;
encode said accessed picture in the bitstream using the encoded transform wherein to encode said transform in the bitstream comprises to encode an information representative of a total count of the number of transform vectors and wherein said at least one processor is further, for at least one transform vector, configured to:
to encode an information representative of a precision for said transform vector, said precision being the number of bits of quantized components of said transform vector;
to quantize said components of said transform vector; and
to encode said quantized components of said transform vector responsive to said precision.
14. The device of claim 13 , wherein said information representative of said precision is a number of bits.
15. The device of claim 13 , wherein said information representative of said precision is a bit decrement.
16. The device of claim 13 , wherein said information representative of said precision is a number of bits for the first transform vector of said accessed transform and a bit decrement for the remaining transform vectors of said accessed transform.
17. A non-transitory computer readable medium storing a bitstream, said bitstream comprising information representative of a transform represented by one or more transform vectors and information representative of a picture encoded using the encoded transform wherein said information representative of a transform comprises information representative of a total count of the number of transform vectors and further comprises for at least one transform vector:
information representative of a precision for said transform vector, said precision being the number of bits of quantized components of said transform vector; and
information representative of said quantized components of said transform vector obtained responsive to said precision.
18. The non-transitory computer-readable medium of claim 17 , wherein said information representative of said precision is a number of bits.
19. The non-transitory computer-readable medium of claim 17 , wherein said information representative of said precision is a bit decrement.
20. The non-transitory computer-readable medium of claim 17 , wherein said information representative of said precision is a number of bits for the first transform vector of said accessed transform and a bit decrement for the remaining transform vectors of said accessed transform.
21. A non-transitory machine readable medium having stored thereon machine executable instructions that, when executed, implement a method comprising:
decoding, from a bitstream, a transform represented by one or more transform vectors;
decoding, from said bitstream, a picture using the decoded transform wherein decoding said transform comprises decoding an information representative of a total count of the number of transform vectors and further comprises for at least one transform vector:
decoding an information representative of a precision for said transform vector, said precision being the number of bits of quantized components of said transform vector;
decoding said quantized components of said transform vector responsive to said precision; and
dequantizing decoded quantized components of said transform vector.
22. The non-transitory machine readable medium of claim 21 , wherein said information representative of said precision is a number of bits.
23. The non-transitory machine readable medium of claim 21 , wherein said information representative of said precision is a bit decrement.
24. The non-transitory machine readable medium of claim 21 , wherein said information representative of said precision is a number of bits for the first transform vector of said transform and a bit decrement for the remaining transform vectors of said transform.
25. A non-transitory machine readable medium having stored thereon machine executable instructions that, when executed, implement a method comprising:
accessing a transform represented by one or more transform vectors;
encoding said transform in a bitstream;
encoding a picture in the bitstream using the encoded transform wherein encoding said transform in the bitstream comprises encoding an information representative of a total count of the number of transform vectors and further comprises for at least one transform vector:
encoding an information representative of a precision for said transform vector, said precision being the number of bits of quantized components of said transform vector;
quantizing said components of said transform vector; and
encoding said quantized components of said transform vector responsive to said precision.
26. The non-transitory machine readable medium of claim 25 , wherein said information representative of said precision is a number of bits.
27. The non-transitory machine readable medium of claim 25 , wherein said information representative of said precision is a bit decrement.
28. The non-transitory machine readable medium of claim 25 , wherein said information representative of said precision is a number of bits for the first transform vector of said accessed transform and a bit decrement for the remaining transform vectors of said accessed transform.