...图像量化；人眼视觉特性；脉冲耦合神经网络；霍夫曼编码 [gap=1150]Key words: signal and information processing; image quantization; human visual characteristics; pulse coupled neural network; Huffman coding ...
At first, it quantizes the image coefficient vector gotten from DWT with the lattice vector quantization technology, then imbeds the watermark signal into the coefficient.
It considered the spatial information of images (which was often neglected), and segmented an image following two steps: color quantization and spatial segmentation.
该方法充分考虑到图像的空间信息，对图像的分割采用两个步骤：颜色量化和图像空间分割。
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In this method, the original image 's feature is extracted by using wavelet transform and quantization. The feature information is changed into watermark by the chaotic sequence encryption.