In this paper, we propose a modification of the HDWTSVD algorithm to encode monochromatic images that combines DWT and SVD techniques. At the encoder side, the input image is divided into blocks (tiles) of 64x64 pixels. A criterion based on the average standard deviation of 8x8 subblocks is used to choose DWT or SVD. If the tile exhibits a high average standard deviation, it is compressed by us...

Image coding using Discrete Wavelet Transform can attain very good results compared to traditional methods. In fact, most of the best known results for image coding have been related to DWT. A simple scheme to code the DWT coefficients is the Embedded zero-tree wavelet algorithm[1] by Shapiro. Embedded zero-tree wavelet can exploit both the similarity among subbands and the sparseness of the su...

Three-dimensional wavelet transform (3D-DWT) encoders are good candidates for applications like professional video editing, video surveillance, multi-spectral satellite imaging, etc. where a frame must be reconstructed as quickly as possible. In this paper, we present a new 3D-DWT video encoder based on a fast run-length coding engine. Furthermore, we present several multicore optimizations to ...

This paper takes up the design of wavelet tight frames that are analogous to Daubechies orthonormal wavelets | that is, the design of minimal length wavelet lters satisfying certain polynomial properties, but now in the oversampled case. The oversampled dyadic DWT considered in this paper is based on a single scaling function and two distinct wavelets. Having more wavelets than necessary gives ...

A reversible data hiding scheme based on integer DWT and histogram modification is proposed. In the scheme, the cover media is firstly transformed by Integer DWT (Discrete Wavelet Transformation); then information is embedded through the modification of histograms of the middle and high frequency sub-bands of the DWT coefficients. In order to increase the embedding capacity, a multi-level schem...

Face recognition is an active research work since its use is widespread in many applications. The proposed work is to develop a hybrid illumination pre-processing method for face recognition by combining two-dimensional Discrete Wavelet Transform (2D DWT) and Contrast Limited Adaptive Histogram Equalization (CLAHE). 2D DWT is applied on the original image and the LL sub-band of DWT coefficients...

Defect detection of integrated circuit (IC) wafer based on two-dimension wavelet transform (2-D DWT) is presented in this paper. By utilizing the characteristics many of the same chips in a wafer, three images with defects located in the same position and different chips are obtained. The defect images contain the standard image without any defects. 2-D DWT presented in the paper can extract th...

In this paper, a new method is proposed for improving the fundamental extraction by wavelet transform. This method uses the discrete wavelet transform (DWT), FIR filter and inverse discrete wavelet transform (IDWT). In the proposed method, frequency interference is allowed to occur at the extracted frequency bands by DWT. DWT output signal is filtered by FIR then the IDWT is used to reconstruct...

In this paper, the authors conduct a review on redundant wavelet transform (RDWT) in video signal processing. As an over-complete version of discrete wavelet transform (DWT), RDWT provides several advantages over the traditional DWT. In video coding area, we utilize its shift-invariant property and its phase-diverse multihypothesis, which are not provided by DWT, to build high performance video...

This paper presents the design and implementation of hybrid wave-pipelined 2D DWT using lifting scheme. In this approach different lifting blocks are interconnected using pipelining and the individual blocks are implemented using WavePipelining (WP). For the purpose of comparison, non pipelined scheme as well as the scheme with pipelining within the blocks and between the blocks is implemented....