Dct and Systolic Array in Image Compression
نویسندگان
چکیده
Systolic arrays are a family of parallel computer architectures capable of using a very large number of processors simultaneously for important computations in applications such as scientific computing and signal processing. A discrete cosine transform (DCT) expresses a sequence of finitely many data points in terms of a sum of cosine functions at different frequencies. DCT is a Fourier-related transform similar to the discrete Fourier transform (DFT), but using only real numbers. DCTs are equivalent to DFTs of roughly twice the length, operating on real data with even symmetry.
منابع مشابه
Energy-efficient 8-point DCT Approximations: Theory and Hardware Architectures
Due to its remarkable energy compaction properties, the discrete cosine transform (DCT) is employed in a multitude of compression standards, such as JPEG and H.265/HEVC. Several low-complexity integer approximations for the DCT have been proposed for both 1-D and 2-D signal analysis. The increasing demand for low-complexity, energy efficient methods require algorithms with even lower computatio...
متن کاملAn Improved Image Compressor Using Fast DCT Algorithm
Video processing systems such as HEVC requiring low energy consumption needed for the multimedia market has lead to extensive development in fast algorithms for the efficient approximation of 2-D DCT transforms. The DCT is employed in a multitude of compression standards due to its remarkable energy compaction properties. Multiplier-free approximate DCT transforms have been proposed that offer ...
متن کاملLossless Microarray Image Compression by Hardware Array Compactor
Microarray technology is a new and powerful tool for concurrent monitoring of large number of genes expressions. Each microarray experiment produces hundreds of images. Each digital image requires a large storage space. Hence, real-time processing of these images and transmission of them necessitates efficient and custom-made lossless compression schemes. In this paper, we offer a new archi...
متن کاملField programmable gate array (FPGA) realization of a fast 2-D discrete cosine transform algorithm for higher image compression
This paper describes the field programmable gate array (FPGA) implementation of a fast 2-D discrete cosine transform (DCT) chip for higher image compression ratio. The development of encoding and decoding parts of 2-D DCT algorithm is carried out by using Matlab simulation tools and VHSIC hardware descriptive language (VHDL). Comparisons of results for higher image compression ratio as obtained...
متن کاملReal Time Video Compression and Novelty Detection using HMM Algorithm
A new DCT approximation that possesses an extremely low arithmetic complexity, requiring only 14 additions. This novel transform was obtained by means of solving a tailored optimization problem aiming at minimizing the transform computational cost. Second, we propose hardware implementations for several 2-D 8-point approximate DCT. All introduced implementations are sought to be fully parallel ...
متن کامل