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A new fractal technique is applied to hair-pin microstrip bandpass filters for the second spurious suppression. The coupled edges of hair-pin microstrip resonators are changed by a new fractal to equalise the odd-mode and even-mode phase velocities so that the nearest spurious harmonic can be suppressed. Simulated and measured results show that the second spurious level is reduced below 30 dB for...
The aim of steganography is to hide huge information in a small media with robustness and invisibility. The main idea of this paper is to utilize a threshold mechanism to embed as much information of the secret image into the cover image as possible. The proposed threshold mechanism is setup especially to fit the human visual system. The experimental results show that the proposed human visual system...
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