A method of video decoding using Intra prediction for color component of video data comprising: receiving a video bitstream including coded data for a current block corresponding to one color component of video data; deriving, from the video bitstream, a block partitioning structure for partitioning the current block into one or more final sub-blocks including at least one non-square final sub-block having a rectangular shape using block partition recursively, wherein the block partition either splits each given block into intermediate sub-blocks using one or more split modes including one binary split mode or applies no splitting to each given block, the current block is treated as an initial given block, each intermediate sub-block is treated as one given block in a next recursion, and any one given block not further split becomes one final sub-block; and reconstructing each non-square final sub-block using non-square Intra prediction; wherein the one color component is a chroma component; characterized in that said reconstructing each non-square final sub-block using non-square Intra prediction comprises including X additional neighboring reconstructed samples (616; 710) in an initial set of samples of each non-square final sub-block for deriving DC predictor associated with DC Intra predictor mode or for deriving Intra prediction parameters associated with LM Intra prediction mode, wherein the initial set of samples of each non-square final sub-block consists of the neighboring reconstructed samples on a short side of each non-square final sub-block and the neighboring reconstructed samples on a long side of each non-square final sub-block, wherein, for each non-square final sub-block, the sum of the number of the neighboring reconstructed samples on the short side and the number of the neighboring reconstructed samples on the long side is not a power-of-2 integer, and wherein, for each non-square final sub-block, X is determined in such a way that the number of neighboring reconstructed samples used for deriving the DC predictor associated with the DC Intra predictor mode or for deriving the Intra prediction parameters associated with the LM Intra prediction mode is a power-of-2 integer. receiving a video bitstream including coded data for a current block corresponding to one color component of video data; deriving, from the video bitstream, a block partitioning structure for partitioning the current block into one or more final sub-blocks including at least one non-square final sub-block having a rectangular shape using block partition recursively, wherein the block partition either splits each given block into intermediate sub-blocks using one or more split modes including one binary split mode or applies no splitting to each given block, the current block is treated as an initial given block, each intermediate sub-block is treated as one given block in a next recursion, and any one given block not further split becomes one final sub-block; and reconstructing each non-square final sub-block using non-square Intra prediction; wherein the one color component is a chroma component; characterized in that said reconstructing each non-square final sub-block using non-square Intra prediction comprises including X additional neighboring reconstructed samples (616; 710) in an initial set of samples of each non-square final sub-block for deriving DC predictor associated with DC Intra predictor mode or for deriving Intra prediction parameters associated with LM Intra prediction mode, wherein the initial set of samples of each non-square final sub-block consists of the neighboring reconstructed samples on a short side of each non-square final sub-block and the neighboring reconstructed samples on a long side of each non-square final sub-block, wherein, for each non-square final sub-block, the sum of the number of the neighboring reconstructed samples on the short side and the number of the neighboring reconstructed samples on the long side is not a power-of-2 integer, and wherein, for each non-square final sub-block, X is determined in such a way that the number of neighboring reconstructed samples used for deriving the DC predictor associated with the DC Intra predictor mode or for deriving the Intra prediction parameters associated with the LM Intra prediction mode is a power-of-2 integer.