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

Claim 10:
11. A device for decoding images by deriving a linear model for obtaining a chroma sample value of a target area from an associated luma sample value of a luma block in the same frame, wherein the device comprises:
a first determining unit configured to determine 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 is determined based on at least down-sampled luma sample values in neighbourhood of the target area, and
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; and
a second determining unit configured to determine 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.