Qing-Xin Zhu

  • Citations Per Year
Learn More
A novel DCT domain color digital watermarking scheme based on chaotic maps is proposed, and the host image is color RGB image. The color space of the color host image is first converted from RGB to YIQ. In order to resist JPEG compression, all three watermark RGB channel signals are buried to Y component of the YIQ color space host images. In the proposed(More)
This paper proposes a novel spatial domain color digital watermarking scheme based on chaotic maps, and the host image is color RGB image. Using Lorenz map and the Arnold cat map encrypt the watermark signal and the embedding position of the host image each other. The color space of the color host image is first converted from RGB to YCbCr. In order to(More)
Besides scoring function methods, correlation analysis is another index to indicate homology of the sequences. In this paper, the statistical properties of correlation between two comparing sequences were analyzed. Natural gradient method was proposed to extract the most uncorrelated components of sequences in an adaptive way and the optimal Performance(More)
A category of Distributed Real-Time Systems (DRTS) that has multiprocessor pipeline architecture is increasingly used. The key challenge of such systems is to guarantee the end-to-end deadlines of aperiodic tasks. This paper proposes an end-to-end deadline control model, called Linear Quadratic Stochastic Optimal Control Model (LQ-SOCM), which features a(More)
  • 1