IMPLEMENTATION OF CONTEXT ADAPTIVE VARIABLE LENGTH CODING AND DECODING ALGORITHM FOR H.264 VIDEO CODEC USING MATLAB

This paper proposes the implementation of Context Adaptive Variable Length Coder for H.264 video encoder. Context-Adaptive Variable Length Coding, a specially designed method of coding the transform coefficients, in which different sets of variable-length codes are chosen depending on the statistics of recently-coded coefficients, using context adaptation. Context Adaptive Variable Length Coding is used to encode residual, scan ordered blocks of transform coefficients. The quantized coefficient inputs to the context adaptive variable length coder is generated by the integer transform and quantization processor. The implementation is capable of bringing about compression of video sequences and is capable ofprocessing high resolution pictures of sizes of up to 1024 x 768 pixels, encoding at a real time frame rate of 25 fps. The compression achieved by the implementation is over 10 and the reconstructed picture quality is better than 35 dB.