Methods, architectures, apparatuses and systems directed to improved linear model estimation for template based video coding

An encoder of video data comprising circuitry, including a processor and memory, configured to:

• code a video block of the video data using a linear model of a template-based video coding technique, the coding comprises:
• determining minimum and maximum values of luma samples neighboring a coding block;
• determining minimum and maximum values of chroma samples neighboring the coding block and corresponding to the chroma for the minimum and maximum values of the luma samples, respectively;
• computing a first parameter of the linear model (i) as a function of a single look up table, including values for determining least significant bits only, and the minimum and maximum values of the chroma samples and (ii) at a first precision, wherein the first precision is less than or equal to 16 bits;
• computing a second parameter of the linear model (i) as a function of the minimum value of the chroma samples, the minimum value of the luma samples and the first parameter of the linear model and (ii) at a second precision, wherein the second precision is less than or equal to 16 bits;
• and
• predicting chroma samples of the coding block based on the first parameter, the second parameter and reconstructed luma samples of the coding block.

A method for decoding video data by a decoder, the method comprising:

• decoding a video block of the video data using a linear model of a template-based video coding technique, the decoding comprises:
• determining minimum and maximum values of luma samples neighboring a coding block;
• determining minimum and maximum values of chroma samples neighboring the coding block and corresponding to the chroma for the minimum and maximum values of the luma samples, respectively;
• computing a first parameter of the linear model (i) as a function of a single look up table, including values for determining least significant bits only, and the minimum and maximum values of the chroma samples and (ii) at a first precision, wherein the first precision is less than or equal to 16 bits;
• computing a second parameter of the linear model (i) as a function of the minimum value of the chroma samples, the minimum value of the luma samples and the first parameter of the linear model and (ii) at a second precision, wherein the second precision is less than or equal to 16 bits;
• and
• predicting chroma samples of the coding block based on the first parameter, the second parameter and reconstructed luma samples of the coding block.

A decoder of video data comprising circuitry, including a processor and memory, configured to:

• decode a video block of the video data using a linear model of a template-based video coding technique, the decoding comprises:
• determining minimum and maximum values of luma samples neighboring a coding block;
• determining minimum and maximum values of chroma samples neighboring the coding block and corresponding to the chroma for the minimum and maximum values of the luma samples, respectively;
• computing a first parameter of the linear model (i) as a function of a single look up table, including values for determining least significant bits only, and the minimum and maximum values of the chroma samples and (ii) at a first precision, wherein the first precision is less than or equal to 16 bits;
• computing a second parameter of the linear model (i) as a function of the minimum value of the chroma samples, the minimum value of the luma samples and the first parameter of the linear model and (ii) at a second precision, wherein the second precision is less than or equal to 16 bits;
• and
• predicting chroma samples of the coding block based on the first parameter, the second parameter and reconstructed luma samples of the coding block.