Method, apparatus, and medium for video processing

An apparatus for video processing comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• perform, for a conversion between a current video unit of a video and a bitstream of the video, a model parameter inheritance for a coding tool, the coding tool comprising at least one of:
• a cross-component model based residual coding (CCRM) tool, an intra template matching prediction (intraTMP) filter tool, or an intra block copy (IBC) filter tool, the model parameter inheritance comprising at least one of:
• a history based model parameter inheritance, a temporal based model parameter inheritance, or a spatial based model parameter inheritance;
• and
• perform the conversion based on the model parameter inheritance.

A non-transitory computer-readable storage medium storing instructions that cause a processor to perform operations comprising:

• performing, for a conversion between a current video unit of a video and a bitstream of the video, a model parameter inheritance for a coding tool, the coding tool comprising at least one of:
• a cross-component model based residual coding (CCRM) tool, an intra template matching prediction (intraTMP) filter tool, or an intra block copy (IBC) filter tool, the model parameter inheritance comprising at least one of:
• a history based model parameter inheritance, a temporal based model parameter inheritance, or a spatial based model parameter inheritance;
• and
• performing the conversion based on the model parameter inheritance.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by an apparatus for video processing, wherein the method comprises:

• performing a model parameter inheritance for a coding tool, the coding tool comprising at least one of:
• a cross-component model based residual coding (CCRM) tool, an intra template matching prediction (intraTMP) filter tool, or an intra block copy (IBC) filter tool, the model parameter inheritance comprising at least one of:
• a history based model parameter inheritance, a temporal based model parameter inheritance, or a spatial based model parameter inheritance;
• and
• generating the bitstream based on the model parameter inheritance.