The discrete cosine transform (DCT) and the discrete sine transform (DST) have found wide applications in speech and image processing, as well as telecommunication signal processing for the purpose of data compression, feature extraction, image reconstruction, and ltering. In this paper, we present new recursive algorithms for the DCT and the DST. The proposed method is based on certain recursi...

Graph filtering is a fundamental tool in graph signal processing. Polynomial filters (PGFs), defined as polynomials of operator, can be implemented the vertex domain, and usually have lower complexity than frequency domain filter implementations. In this paper, we focus on design for graphs with Fourier transform (GFT) corresponding to discrete trigonometric (DTT), i.e., one 8 types cosine tran...

Telemedicine is well known application where enormous amount of medical data need to be transferred securely over network and manipulate effectively. Security of digital data, especially medical images, becomes important for many reasons such as confidentiality, authentication and integrity. Digital watermarking has emerged as a advanced technology to enhance the security of digital images. The...

Electrocardiogram (ECG) data compression algorithm is needed to reduce the amount of data to be transmitted, stored and analyzed, without losing the clinical information content. This work investigates a set of ECG data compression schemes to compare their performances in compressing ECG signals. These schemes are based on transform methods such as discrete cosine transform (DCT), fast fourier ...

The integer transform (such as the Walsh transform, the Haar transform) is a discrete transform that all the entries in the transform matrix are integers. For software and hardware, the integer transform is much easier to be implemented because there is no real number multiplication, but performance is not guaranteed. By contrast, the non-integer transform (such as the DCT, the DFT) has higher ...

Digital watermarking is important as it facilitates security & protection to digital data whereas when this data are used within international network they must exist in compressed format as it requires minimum transmission bandwidth & reduced storage requirement. Hence our proposed scheme will serve as a solution for maintaining the digital data in compressed state. To achieve this goal the pr...

—Orthogonal Frequency Division Multiplexing (OFDM) has developed into a popular scheme for wideband digital communication, used in applications such as digital television and audio broadcasting, DSL Internet access, wireless networks, powerline networks, and 4G mobile communications. It plays an important role in the new generation of mobile communication. In OFDM system, channel estimation is...

-In this paper, area-efficient architectures for the implementation of integer discrete cosine transform (DCT) of different lengths to be used in High Efficiency Video Coding (HEVC) are proposed. An efficient constant matrix multiplication scheme can be used to derive parallel architectures for 1-D integer DCT of different lengths such as 4, 8, 16, and 32. Also power-efficient structures for fo...

Face recognition is a challenging problem and up to date, there is no technique that provides a robust solution to all situations. This paper presents a hybrid approach to pose invariant human face recognition. The proposed scheme is based on a combination of the Discrete Wavelet Transform (DWT) and Discrete Cosine Transform (DCT) analysis on face images. The DWT-DCT domain coefficients are use...

In this paper, we introduce 2DPCA, DiaPCA and DiaPCA+2DPCA in DCT domain for the aim of face recognition. The 2D DCT transform has been used as a preprocessing step, then 2DPCA, DiaPCA and DiaPCA+2DPCA are applied on the upper left corner block of the global 2D DCT transform matrix of the original images. The ORL face database is used to compare the proposed approach with the conventional ones ...