Encoding and decoding method and corresponding devices

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 number of transform vectors and further comprises for at least one transform vector:
• decoding an information representative of an encoding precision for said transform vector, said encoding precision being the number of bits used to encode quantized components of said transform vector;
• decoding said quantized components of said transform vector responsive to said encoding precision;
• and
• dequantizing decoded quantized components of said transform vector.

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 (E38) an information representative of a number of transform vectors and further comprises for at least one transform vector:
• encoding an information representative of an encoding precision for said transform vector, said encoding precision being the number of bits used to encode 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 encoding precision.

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 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 an encoding precision for said transform vector, said encoding precision being the number of bits used to encode quantized components of said transform vector;
• to decode said quantized components of said transform vector responsive to said encoding precision;
• and
• to dequantize decoded quantized components of said transform vector.

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 ore 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 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 an encoding precision for said transform vector, said encoding precision being the number of bits used to encode 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 encoding precision.

A 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 number of transform vectors and further comprises for at least one transform vector:
• decoding an information representative of an encoding precision for said transform vector, said encoding precision being the number of bits used to encode quantized components of said transform vector;
• decoding said quantized components of said transform vector responsive to said encoding precision;
• and
• dequantizing decoded quantized components of said transform vector.

A 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 number of transform vectors and further comprises for at least one transform vector:
• encoding an information representative of an encoding precision for said transform vector, said encoding precision being the number of bits used to encode quantized components of said transform vector;
• quantizing said components of said transform vector;
• encoding said quantized components of said transform vector responsive to said encoding precision.