H.264 [1] and AVS [2] are the emerging state-of-art video coding standards, in which the block-based hybrid coding framework is employed. DCT or its approximation such as Integer Cosine Transform (ICT) is the centerpiece for signal decorrelation and energy compaction. After DCT, the transform coefficients are quantized and scanned into one-dimensional (1-D) signals, named run-level pairs. The k...

This proposed paper presents architecture of generalized recursive function to generate approximation of orthogonal function DCT with an approximate length N could be derived from a pair of DCTs of length (N/2) at the cost of N additions for input preprocessing. Approximation of DCT is useful for reducing its computational complexity without impact on its coding performance. Most of the existin...

PURPOSE The purpose of the study was to examine the effect of central corneal thickness (CCT), corneal curvature, astigmatism, axial length (AL), and age on measurements with the Pascal Dynamic Contour Tonometer (DCT). METHODS In a prospective clinical trial 75 eyes of 75 patients undergoing phacoemulsification were examined. Before phacoemulsification, the anterior chamber was cannulated at ...

BACKGROUND Intraocular pressure (IOP) measurements using Goldmann applanation tonometry (GAT) are influenced by central corneal thickness (CCT) whereas dynamic contour tonometry (DCT) allows for IOP measurements independent of CCT. After Descemet's stripping automated endothelial keratoplasty (DSAEK) the CCT is, compared to healthy eyes, increased. The objective of this prospective study was to...

The discrete cosine transform (DCT) is a relevant tool in signal processing applications, mainly known for its good decorrelation properties. Current image and video coding standards—such as JPEG HEVC—adopt the DCT fundamental building block compression. Recent works have introduced low-complexity approximations DCT, which become paramount applications demanding real-time computation low-power ...

Abstract This paper proposes a new high-performance Discrete Cosine Transform (DCT) for image and signal processing applications. Generally, DCT has been developed in wide range of applications such as compression motion detection. However, the high complexity required have effectively minimized practical utilization DCT. A New mathematical derivation is achieved this with purpose to reduce its...

Abstract: Discrete cosine transform (DCT) and inverse DCT (IDCT) have been widely used in many image processing systems. In this paper, a novel linear-array of DCT and IDCT is derived from the data flow of subband decompositions representing the factorized coefficient matrices in the matrix formulation of the recursive algorithm. For increasing the throughput as well as decreasing the hardware ...

This paper introduces the Dynamic Cascade Tree (DCT), a structure designed to index query regions on multi-dimensional data streams. The DCT is designed for a stream management system with a particular focus on Remotely-Sensed Imagery (RSI) data streams. For these streams, an important query operation is to efficiently restrict incoming geospatial data to specified regions of interest. As nearl...

−− This paper presents the architecture and the VHDL design of the integer TwoDimensional Discrete Cosine Transform (2-D DCT) used in the H.264/AVC codecs. The forward and inverse 2-D DCT architectures were designed and their synthesis results mapped to Altera FPGAs are presented. The 2-D DCT calculation is performed by exploring the separability property, in such way, each 2-D DCT architecture...