# US 2018/0324462 A1 · Encoding and decoding method and corresponding devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324462 A1 - Document ID: US20180324462A1 - Status: Published application - Kind: A1 - Application number: 15/774,992 - Filed: 2016-11-02 - Published: 2018-11-08 - Earliest claimed: 2015-11-09 - Assignees: Thomson Licensing - Applicants: THOMSON Licensing - Inventors: Saurabh PURI; Sebastien LASSERRE; Patrick LE CALLET - Web page: https://patentgrep.com/patent/US20180324462A1 ## CPC - H04N 19/60: using transform coding - H04N 19/12: Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or selection between H.263 and H.264 - H04N 19/124: Quantisation - H04N 19/126: Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers - H04N 19/136: Incoming video signal characteristics or properties - H04N 19/176: the region being a block, e.g. a macroblock - H04N 19/184: the unit being bits, e.g. of the compressed video stream - H04N 19/463: by compressing encoding parameters before transmission - H04N 19/94: Vector quantisation - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A method for decoding a bitstream representative of a picture is disclosed. The decoding method comprises:—determining information representative of at least one encoding precision;—decoding a transform responsive to said determined information;—decoding said picture using the decoded transform. ## Claims ### Claim at position 1 1-15. (canceled) ### Claim 16 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. ### Claim 17 (depends on 16) The method of claim 16, wherein said information representative of said at least one encoding precision is a number of bits. ### Claim 18 (depends on 16) The method of claim 16, wherein said information representative of said at least one encoding precision is a bit decrement. ### Claim 19 (depends on 16) The method of claim 16, wherein said information representative of said at least one encoding precision is a number of bits for the first transform vector of said transform and wherein said information representative of said at least one encoding precision is a bit decrement for the remaining transform vectors of said transform. ### Claim 20 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. ### Claim 21 (depends on 20) The method of claim 20, wherein said information representative of said at least one encoding precision is a number of bits. ### Claim 22 (depends on 20) The method of claim 20, wherein said information representative of said at least one encoding precision is a bit decrement. ### Claim 23 (depends on 20) The method of claim 20, wherein said information representative of said at least one encoding precision is a number of bits for the first transform vector of said accessed transform and wherein said information representative of said at least one encoding precision is a bit decrement for the remaining transform vectors of said accessed transform. ### Claim 24 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. ### Claim 25 (depends on 24) The device of claim 24, wherein said information representative of said at least one encoding precision is a number of bits. ### Claim 26 (depends on 24) The device of claim 24, wherein said information representative of said at least one encoding precision is a bit decrement. ### Claim 27 (depends on 24) The device of claim 24, wherein said information representative of said at least one encoding precision is a number of bits for the first transform vector of said transform and wherein said information representative of said at least one encoding precision is a bit decrement for the remaining transform vectors of said transform. ### Claim 28 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. ### Claim 29 (depends on 28) The device of claim 28, wherein said information representative of said at least one encoding precision is a number of bits. ### Claim 30 (depends on 28) The device of claim 28, wherein said information representative of said at least one encoding precision is a bit decrement. ### Claim 31 (depends on 28) The device of claim 28, wherein said information representative of said at least one encoding precision is a number of bits for the first transform vector of said accessed transform and wherein said information representative of said at least one encoding precision is a bit decrement for the remaining transform vectors of said accessed transform. ### Claim 32 A 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 number of transform vectors and further comprises for at least one transform vector: 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; and information representative of said quantized components of said transform vector obtained responsive to said encoding precision. ### Claim 33 (depends on 32) The medium of claim 32, wherein said information representative of said at least one encoding precision is a number of bits. ### Claim 34 (depends on 32) The medium of claim 32, wherein said information representative of said at least one encoding precision is a bit decrement. ### Claim 35 (depends on 32) The medium of claim 32, wherein said information representative of said at least one encoding precision is a number of bits for the first transform vector of said accessed transform and wherein said information representative of said at least one encoding precision is a bit decrement for the remaining transform vectors of said accessed transform. ### Claim 36 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. ### Claim 37 (depends on 36) The machine readable medium of claim 36, wherein said information representative of said at least one encoding precision is a number of bits. ### Claim 38 (depends on 36) The machine readable medium of claim 36, wherein said information representative of said at least one encoding precision is a bit decrement. ### Claim 39 (depends on 36) The machine readable medium of claim 36, wherein said information representative of said at least one encoding precision is a number of bits for the first transform vector of said transform and wherein said information representative of said at least one encoding precision is a bit decrement for the remaining transform vectors of said transform. ### Claim 40 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. ### Claim 41 (depends on 40) The machine readable medium of claim 40, wherein said information representative of said at least one encoding precision is a number of bits. ### Claim 42 (depends on 40) The machine readable medium of claim 40, wherein said information representative of said at least one encoding precision is a bit decrement. ### Claim 43 (depends on 40) The machine readable medium of claim 40, wherein said information representative of said at least one encoding precision is a number of bits for the first transform vector of said accessed transform and wherein said information representative of said at least one encoding precision is a bit decrement for the remaining transform vectors of said accessed transform.