Li Hongqin

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A rotation, scaling and cropping invariant watermarking scheme using image normalization is proposed in this paper. Watermark is adaptively embedded in discrete wavelet transform. Robust image feature points against rotation, scaling, noise and JPEG compression are obtained by the affine invariant Harris feature point detector and used to make the Delaunay(More)
The Delta-Sigma Digital-to-Analog Converter ( Δ - Σ) is designed in Verilog HDL for stereo video system. This DAC supports 16-bit or 18-bit input data and includes an 8x digital interpolation filter followed by a 64x oversampled delta-sigma modulator. The modulator output controls the reference voltage input to analog low-pass filter. The(More)
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