Patent ID: 11924433
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A non-transitory computer readable carrier medium comprising processor executable code for a programmable apparatus, comprising a sequence of instructions for implementing a method of deriving a linear model for obtaining chroma sample value of a chroma block of a target area from an associated luma sample value of a luma block in the same frame, when loaded into and executed by the programmable apparatus, the method comprising
determining two pairs of values for determining the linear model, each of the two pairs of values being defined by two variables, a first variable of said two variables corresponding to a luma sample value, a second variable of said two variables corresponding to a chroma sample value,
wherein the two pairs of values for determining the linear model are determined based on at least down-sampled luma sample values in neighbourhood of the target area,
wherein each value in said two pairs of values for determining the linear model is determined by averaging two values based on the sample values in the neighbourhood; and
determining parameters of the linear model by calculating a difference between the luma sample values of the two pairs of values for determining the linear model and a difference between the chroma sample values of the two pairs of values for determining the linear model.