intra prediction is used in state - of - the - art video coding standards such as avc . the intra prediction modes are coded into the bitstream . luma and chroma components could potentially have different prediction modes . for chroma components , there are 5 different modes defined in avc : vertical , horizontal , dc , diagonal down right , and “ same as luma ”. statistics show that the “ same as luma ” mode is frequent used , but in avc , this mode is encoded using more bits than other modes during entropy coding , therefore the coding efficiency is decreased . accordingly , a modified binarization / codeword assignment for chroma intra mode signaling is able to be utilized for high efficiency video coding , the next generation video coding standard .