VLSI Architecture for DCT Based On High Quality DA
Urbi Sharma, Tarun Verma, Rita Jain · 2014
Discrete Cosine Transform (DCT) is the major building blocks in an image and video compression system, which can be achieved using various specialized algorithms. It is also being used in various standardized coding schemes. Such as JPEG, MPEG-2, and various others.The computation involved while performing DCT through direct approach requires a large number of multiplications which are time-consuming and eventually results in adding delay while performing arithmetic operations. It can completely be avoided using Distributed Arithmetic (DA) approach and the proposed architecture is implemented on same grounds. However shifting and addition used in the proposed method is based on utilizing fixed point arithmetic, and thus providing more precise results as compared to existing architectures. The operation when implemented on Vertex-5 FPGA results in more precise results with the delay of 17 ns and only 2% of available LUTs.