Global, constant-velocity, translational motion in an image sequence induces a characteristic energy footprint in the Fourier-transform (FT) domain; spectrum is limited to a plane with orientation defined by the direction of motion. By detecting these spectral occupancy planes, methods have been proposed to estimate such global motion. Since the discrete cosine transform (DCT) is a ubiquitous t...

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 work addresses the problem of signal dependent noise removal in images. An adaptive nonlinear filtering approach in the orthogonal transform domain is proposed and analyzed for several typical noise environments in the DCT domain. Being applied locally, i.e., within a window of small support, DCT is expected to approximate the Karhunen-Loeve decorrelating transform, which enables effective...

The paper proposes a digital watermarking algorithm for audio copyright protection combined characteristics of singular value decomposition (SVD) and discrete cosine transform (DCT). The audio are split into blocks, and each block are decomposed on discrete cosine transform (DCT), then the DCT coefficients are decomposed on singular value decomposition (SVD) transform and embedded the watermark...

—A novel linear transform, called All Phase Biorthogonal Transform (APBT), was generated from All Phase Digital Filter (APDF) theory. APBT can be used in image compression instead of the conventional Discrete Cosine Transform (DCT), and the corresponding image compression scheme is called APBT-based JPEG (APBT-JPEG) which can achieve better coding performance, especially at low bit rates. With...

The Discrete Cosine Transform (DCT) and Discrete Sine Transform (DST) have found applications in digital signal, image and video processing and particularly in transform coding systems for data compression and decompression. Multimode interference (MMI) in optical silicon on insulator (SOI) waveguides is attractive for realizing all-optical DCT and DST transforms as they have the advantages of ...

This paper presents a semi-fragile blind watermarking scheme for color images based on Visual Cryptography (VC) and Discrete Cosine Transform (DCT). Firstly, the binary watermark image is separated into two shares, i.e., the public share and the private share, by using the VC technique. Then, the color host image is converted from the RGB color space into the HSV color space. Next, the DCT tran...

Transform coding consists of a scalar quantization of the features of an image representation. These features should be independent enough to justify the scalar approach. The coefficients of the commonly used DCT representation still show some dependence that may reduce its efficiency. In this work, a perceptually inspired non-linear transform is used to map the DCT into a new representation th...

The scheme proposed in this paper combines independent components analysis (ICA) with discrete wavelet transform (DWT) and discrete cosine transform (DCT). Firstly, the original image is decomposed by 2-D DWT and the detail sub-bands are reserved. Then, the approximate image is transformed by DCT and embedded with watermark. The watermark is detected through ICA. The simulation results demonstr...

Abstract: Two-dimensional discrete cosine transform (DCT) and inverse discrete cosine transform (IDCT) have been widely used in many image processing systems. In this paper, efficient architectures with parallel and pipelined structures are proposed to implement 8 8× DCT and IDCT processors. In which, only one bank of SRAM (64 words) and coefficient ROM (6 words) is utilized for saving the memo...