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Donoho and Johnstone (1994) proposed a method for threshold shrink denoising based on wavelets coefficient estimation of each isolating scale get optimal results, but the correlation of contiguous coefficients is not considered. The detail of signal will be dismissed if its coefficient is similar to noisy coefficients. a novel algorithm for ground penetrating radar (GPR) image denoising based on scale...
Discrete cosine transform (DCT) is an important tool in digital signal processing. In this paper, based on our previous work of performing DCT via linear sums of discrete moments, we have made development to eliminate multiplications in discrete cosine transforms by performing appropriate bit operations and shift in binary system, which can be implemented by integer additions of fixed points. An efficient...
With the increase of streaming video application on the Internet, the requirement of video compression has changed. The improved method of fine granular scalability(FGS) is given, which based on the wavelet transform and discrete cosine transform(DCT). The simulation has verified, which proves the feasibility of the method.
In this paper, a DWT-based video watermark algorithm has been proposed to carry on three-DWT to the video frame after the scene analysis, the using of genetic algorithm to insert the watermark image that has been scrambled by Arnold scrambling algorithm ensures the hidden data visually invisibility. Blind watermark algorithm is used when it extracts watermark image. The experimental results illustrate...
The classification and copyright protection of digital map were described in this paper. After the basic theories of digital watermarking were introduced, the technologies that have been used in vector map digital watermarking were analyzed, and its classification of algorithms was expatiated on. Finally the possible directions for further research were pointed out.
The post-quota era brings new opportunities and challenges for the textile industries of the world. The upgrade of industry structure is not only the external requirement of Chinese textile industry to implement a scientific outlook on development, transform the growth mode and take a new industrialized road but also the necessary option for China to deal with the conflicts and challenges after the...
In this paper, we propose a watermarking algorithm for color image based DCT and DWT. A binary image as watermark is embedded into green component or blue component of color image. The algorithm can satisfy the transparence and robustness of the watermarking system very well. The experiment based on this algorithm demonstrates that the watermarking is robust to the common signal processing techniques...
The quasi-regular patterns generated from Hamiltonian has unique balanced symmetry. The patterns are quite suitable for the textile fabric. However the number of patterns just generated from Hamiltonian are limited. Therefore in this paper a 110 of functions built by the methods of Hamiltonian of superposition, nesting, combination and parameter variations, and it can increase the type and quantity...
Aiming at the limitation of current algorithms for corner detection, a novel algorithm is proposed for detecting both the internal and external corners of checkerboard image in this paper. Firstly, initial locations of corners are obtained by introducing perspective projection transform. Secondly, within the area of initial locations, internal corners of checkerboard image are detected with symmetry...
The researches and applications for digital watermarking technology are more and more extensive, at present, they mainly embodied in the watermark image, video watermarking, as well as voice in areas such as watermarks. This paper based on the popular image scrambling in the Arnold transform method gives the image on the protection of digital watermarking algorithm, the embedded watermark information...
It is usually difficult for students to understand some theories in learning physical chemistry. A new teaching method was proposed that we should introduce the forming process and the research method (FPRM) of those theories to help them being understood. ldquoCarnot cyclerdquo teaching is analyzed as an example by FPRM method.
According to the characteristics of multi-focus images, a new image fusion algorithm based on multi-wavelet transform is proposed in this paper. Firstly, in order to obtain the sub-band multi-wavelet coefficients, two multi-focus images are transformed by multi-wavelet. Then, the regional gradients of high-frequency sub-bands at the largest scale are calculated. Finally, the high-frequency multi-wavelet...
Wavelet-domain hidden Markov models (HMMs) have been recently proposed and applied to image processing, e.g., image denoising. In this paper, we develop a new HMM, called hierarchical hidden Markov tree model (HHMT), by adopting a feasible and fast two stage algorithm which avoids the time-consuming training process to estimate the HMT model parameters. The HHMT can exploit both the local statistics...
We first give a new fractionalization of discrete cosine and sine transforms of types I, IV, V and VIII. The fractional discrete cosine and sine transforms with four random parameters are defined, to which we refer as random fractional discrete cosine and sine transforms. A novel image encryption algorithm based on random fractional discrete cosine or sine transform and random phase encoding technique...
A novel de-noising method based on wavelet transform is presented based on the good localization characteristic of the wavelet transform both in time and frequency domain, which can make happen the extraction of visual evoked potentials in single training sample from the EEG background noise in favor of studying the changes between the single sample response. The information is probably related with...
Dielectric loss angle measurement has the error easily when noise ratio is low for short-term Fourier (STFT) interpolation harmonic analysis, easy to cover up real value. It shares the dielectric loss measurement method based on Wiener filtering of wavelet transform region. Via the excellent time-frequency analysis tools of wavelet transform, we pick-up basal frequency signal. And we calculate dielectric...
We present a novel 2-D directional adaptive red-black wavelet transform (DA-RBWT). This approach uses three or four pixels to adaptively predict the value of middle pixel according to the correlation among its neighboring pixels. Compared to red-black wavelet transform (RBWT) on a rectangular grid, DA-RBWT shows more directions for its adaptability to local image features, especially for the regions...
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