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In this paper, we propose an improved image fusion algorithm, which uses structural similarity to match the local energy of images. The local energy method can reflect the complemen-tarity between different types of images. But for grayscale images and infrared images which have very different intensity, the fusion between them can produce dark spots in the result. To avoid this, we introduce a structural...
In this paper, a novel reversible watermarking method based on the coefficient adjustment technique is proposed. A host image is first decomposed into the integer wavelet transform (IWT) domain. Subsequently, a secret message is embedded into the low-high (LH), high-low (HL), and high-high (HH) sub-bands of the IWT using the coefficient adjustment method. Experiments confirm that the proposed method...
Wavelet energy entropy has a small calculation amount, and it has a unique sensibility to slightly change of the dynamic system parameters. This paper presents a novel transient-based protection for power system EHV transmission line, which employ the value of wavelet energy entropy to reflect the different energy distribution between internal and external fault. The basic principle of the protection...
A simple and effective lossless data hiding algorithm is presented. Based on integer wavelet transform (IWT), a secret message is embedded in the three high subbands of IWT domain by the proposed coefficient-bias algorithm. More specifically, to provide a higher hidden space without severe distortion, only the coefficients of each block that located in a predetermined interval are utilized to hide...
A simple digital watermarking based on integer wavelet transform (IWT) is proposed. Instead of hiding data bits directly to the blocks, we employ adaptive bit-labeling scheme to a block so that it can be used to carry a data bit 0 or 1. Simulations show that the proposed method robustness against manipulations such as JPEG2000, JPEG, cropping, (color) quantization, noise additions, low-pass filtering,...
Product innovation capability is becoming the core competence of manufacturing enterprises, and many researches show that the knowledge and innovation ability of customers are the most important resources of enterprises' innovation capability. How to identify innovation customers and evaluate them becomes a hot issue. Firstly, according to the characteristics of customer collaborative product innovation,...
Many techniques for recognizing and identifying disturbed signals waveforms are primarily based on visual inspection. This paper proposes a wavelet packet decomposition based technique to perform a feature extraction from the disturbed signals in order to identify the possible causes of the disturbance. On the basis of definition groups of Electromagnetic Interference, the interested information about...
An improved threshold algorithm for signal detection and denoising was developed based on wavelet transform. Two different thresholds are established according to the signal-to-noise ratio (SNR) of the signal. The measurements of the threshold vary with the wavelet scale, due to the different transformation characteristics of signals and noises at different scale. Through the decomposition of the...
This paper presents a new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines. This scheme is developed using wavelet analysis, in which the singularity of fault transient voltage signals in one terminal is utilized to discriminate clearly between internal and external faults. Lipschitz exponent (LE) is obtained from wavelet modulus maximum to detect singularity of...
A new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines is presented in this paper. The singularity of fault transient voltage signals in one terminal is utilized to discriminate clearly between internal and external faults. Lipschitz exponent (LE) is obtained from wavelet modulus maximum to detect singularity of signals. A typical 500 kV EHV transmission system...
A new ultra high-speed protection scheme is proposed in this paper. Using wavelet transform with multiresolution analysis, the current signals is decomposed into a series of detailed wavelet components. The spectral energies of the wavelet components are calculated and then employed to detect the faults. Characteristics of the proposed ultra high-speed protection algorithm are analyzed and results...
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