Implementation of Intrapredictions, Transform, Quantization and CAVLC for H.264 Video Encoder

Video compression algorithms operate by removing temporal and spatial redundancies in a video encoder conforming to standards such as H.264. Intra Prediction modes in H.264 improve the compression, exploiting spatial redundancy. In this work, we have implemented nine modes of intraprediction in Matlab as specified in the standard. This paper presents the algorithm for all the nine modes of intraprediction. The simulated results show better compression can be achieved in Vertical, Horizontal and Horizontal up modes than other modes for a number of pictures that have been experimented with. The compression achieved was 12 or more for these modes without sacrificing the quality of the reconstructed picture. Quality achieved was over 35 dB, indistinguishable from the original. In most of the pictures experimented with, compression improves appreciably with Intraprediction than without it up to 54%.