carries out the complementary processes of decoding, inverse transform and reconstruction to produce a decoded video sequence. 2.1 Encoder processes Prediction The encoder processes a of video in units of a macroblock (16x16 displayed pixels). It forms a prediction of the macroblock based on previously-coded data, either from the current frame (intra prediction) or from other frames that have already been coded and transmitted (inter prediction). The encoder subtracts the prediction from the current macroblock to form a residual. The prediction methods supported by H.264 are more flexible than those in previous standards, enabling accurate predictions and hence video compression. Intra prediction uses 16*16 and 4*4 block sizes to predict the macroblock from the surrounding, previously-coded pixels within the same frame (Figure 10). Fig.10 Intra Prediction [23] Inter prediction uses a range of block sizes (from 16x16 down to 4x4) to predict pixels in the current frame from similar regions in previously-coded frames (Figure 11). Fig.11 Inter Prediction [23] Transform and quantization
carries out the complementary processes of decoding, inverse transform and reconstruction to produce a decoded video sequence. 2.1 Encoder processes Prediction The encoder processes a of video in units of a macroblock (16x16 displayed pixels). It forms a prediction of the macroblock based on previously-coded data, either from the current frame (intra prediction) or from other frames that have already been coded and transmitted (inter prediction). The encoder subtracts the prediction from the current macroblock to form a residual. The prediction methods supported by H.264 are more flexible than those in previous standards, enabling accurate predictions and hence video compression. Intra prediction uses 16*16 and 4*4 block sizes to predict the macroblock from the surrounding, previously-coded pixels within the same frame (Figure 10). Fig.10 Intra Prediction [23] Inter prediction uses a range of block sizes (from 16x16 down to 4x4) to predict pixels in the current frame from similar regions in previously-coded frames (Figure 11). Fig.11 Inter Prediction [23] Transform and quantization
MPInterimReport_Vasavee.docx