Frequency domain multiple input output modal parameters identification with consideration of stochastic noise 計及隨機噪聲的頻域多輸入多輸出模態參數識別
Experimental results show that the embedded digital watermarking is invisible and robust enough against common image processing such as jpeg compression , filter , adding the stochastic noises and shearing 實驗結果表明:使用該算法嵌入的數字水印具有很好的隱蔽性,并且嵌入水印的圖像對有損壓縮、濾波、加入隨機噪聲和剪切等攻擊操作具有較強的魯棒性。
Compared with the hardware compensating , the software compensating can not only simplify the design of circuits , reduce the cost , but also enhance the ability of getting rid of stochastic noise , stability , and accuracy , at the same time , the capability of the processor is sufficiently presented 軟件補償與硬件補償相比,不但大大簡化了硬件電路設計,降低了產品成本,而且抗干擾能力,穩定性,精度都有很大提高,同時也充分發揮了arm處理器的性能。
In order to adapt the scheme to both the color image and the gray image , while embedding the watermarking into the image , the scaling factors are determined by the local luminance feature and texture features of the image . it can improve the embedding strength and the watermarking robustness . from the experimental results , the stego - images are extremely robust to common image processing such as median filter , jpeg compression and denoising after adding the stochastic noises 2 、提出了一種新的基于小波變換和紋理特征的數字水印算法,該算法依據從圖像小波域提取出的紋理特征來選取水印的嵌入位置,較好地利用了圖像的紋理區域,既能掩蔽較多的噪聲,又能較好地抵抗jpeg壓縮等一般性攻擊,調節了數字水印技術中存在的不可見性與魯棒性之間的矛盾。
Two conclusions about suspending control system are given in this paper : 1 . the single suspending system controlled by parameter self - turning control algorithm has better performance when the mass of single point suspending system , the resistance of electromagnet and the suspending gap are variable ; 2 . the single suspending system controlled by global asymptotic stability control algorithm is global asymptotic stability and can restrain the stochastic noise 通過對采用上述控制算法的懸浮系統的理論分析和仿真研究,主要得到了以下幾方面結論: 1 .當系統懸浮質量、電磁鐵電阻和額定間隙參數變化時,設計的參數自校正控制算法可使系統的動態性能指標保持在設定的指標; 2 .設計的全局穩定控制算法,能夠保證二級結構單點懸浮系統的全局漸近穩定,且對隨機噪聲干擾有一定的抑制作用。