In the intricate network environment,the secure transmission of medical images faces challenges such as information leakage and malicious tampering,significantly impacting the accuracy of disease diagnoses by medical ...In the intricate network environment,the secure transmission of medical images faces challenges such as information leakage and malicious tampering,significantly impacting the accuracy of disease diagnoses by medical professionals.To address this problem,the authors propose a robust feature watermarking algorithm for encrypted medical images based on multi-stage discrete wavelet transform(DWT),Daisy descriptor,and discrete cosine transform(DCT).The algorithm initially encrypts the original medical image through DWT-DCT and Logistic mapping.Subsequently,a 3-stage DWT transformation is applied to the encrypted medical image,with the centre point of the LL3 sub-band within its low-frequency component serving as the sampling point.The Daisy descriptor matrix for this point is then computed.Finally,a DCT transformation is performed on the Daisy descriptor matrix,and the low-frequency portion is processed using the perceptual hashing algorithm to generate a 32-bit binary feature vector for the medical image.This scheme utilises cryptographic knowledge and zero-watermarking technique to embed watermarks without modifying medical images and can extract the watermark from test images without the original image,which meets the basic re-quirements of medical image watermarking.The embedding and extraction of water-marks are accomplished in a mere 0.160 and 0.411s,respectively,with minimal computational overhead.Simulation results demonstrate the robustness of the algorithm against both conventional attacks and geometric attacks,with a notable performance in resisting rotation attacks.展开更多
Henry James' s first novella Daisy Miller brought him popularity and literary reputation after its publication. Through the application of reader theory and a close reading of the text, this article analyzes Daisy...Henry James' s first novella Daisy Miller brought him popularity and literary reputation after its publication. Through the application of reader theory and a close reading of the text, this article analyzes Daisy's strong personality and her misfortunes during her trip to Europe, and reveals how the novella highlights the conflict between American frankness and innocence and European sophistication. Besides, this article also elaborates on James' unique artistic skills—central consciousness and psychological analysis through his choice of narrative point of view, which contribute to the theme and the artistic charm of DaisyMiller.展开更多
Daisy Miller,among Henry James’masterpieces,is the novella which won him international fame.As some critics have analyzed,Daisy is a victim of the values of the Old World.In the author’s opinion,Daisy’s tragedy sho...Daisy Miller,among Henry James’masterpieces,is the novella which won him international fame.As some critics have analyzed,Daisy is a victim of the values of the Old World.In the author’s opinion,Daisy’s tragedy should be partly attributed to prejudice,which impedes the international communication between the newly wealthy Americans and the Europeanized Americans.In this sense,this paper focuses on an analysis of three forms of prejudice in Daisy Miller and tries to interpret Daisy’s tragic destiny from the perspective of intercultural communication.展开更多
The Great Gatsby,the masterpiece of the American author Francis Scott Key Fitzgerald,is published in 1925,just after the World WarⅠ.It mainly narrates the tragic love story between Daisy and Gatsby,reflecting many so...The Great Gatsby,the masterpiece of the American author Francis Scott Key Fitzgerald,is published in 1925,just after the World WarⅠ.It mainly narrates the tragic love story between Daisy and Gatsby,reflecting many social problems.This essay emphasizes on the tragic love,and introduces their tragedies respectively,especially the tragedy of Daisy,reconstructing the image of the leading lady as a victim too.Furthermore,we turn to analyze the causes of the tragic love according to the author's own experience and the background of that era.展开更多
基金National Natural Science Foundation of China,Grant/Award Numbers:62063004,62350410483Key Research and Development Project of Hainan Province,Grant/Award Number:ZDYF2021SHFZ093Zhejiang Provincial Postdoctoral Science Foundation,Grant/Award Number:ZJ2021028。
文摘In the intricate network environment,the secure transmission of medical images faces challenges such as information leakage and malicious tampering,significantly impacting the accuracy of disease diagnoses by medical professionals.To address this problem,the authors propose a robust feature watermarking algorithm for encrypted medical images based on multi-stage discrete wavelet transform(DWT),Daisy descriptor,and discrete cosine transform(DCT).The algorithm initially encrypts the original medical image through DWT-DCT and Logistic mapping.Subsequently,a 3-stage DWT transformation is applied to the encrypted medical image,with the centre point of the LL3 sub-band within its low-frequency component serving as the sampling point.The Daisy descriptor matrix for this point is then computed.Finally,a DCT transformation is performed on the Daisy descriptor matrix,and the low-frequency portion is processed using the perceptual hashing algorithm to generate a 32-bit binary feature vector for the medical image.This scheme utilises cryptographic knowledge and zero-watermarking technique to embed watermarks without modifying medical images and can extract the watermark from test images without the original image,which meets the basic re-quirements of medical image watermarking.The embedding and extraction of water-marks are accomplished in a mere 0.160 and 0.411s,respectively,with minimal computational overhead.Simulation results demonstrate the robustness of the algorithm against both conventional attacks and geometric attacks,with a notable performance in resisting rotation attacks.
文摘Henry James' s first novella Daisy Miller brought him popularity and literary reputation after its publication. Through the application of reader theory and a close reading of the text, this article analyzes Daisy's strong personality and her misfortunes during her trip to Europe, and reveals how the novella highlights the conflict between American frankness and innocence and European sophistication. Besides, this article also elaborates on James' unique artistic skills—central consciousness and psychological analysis through his choice of narrative point of view, which contribute to the theme and the artistic charm of DaisyMiller.
文摘Daisy Miller,among Henry James’masterpieces,is the novella which won him international fame.As some critics have analyzed,Daisy is a victim of the values of the Old World.In the author’s opinion,Daisy’s tragedy should be partly attributed to prejudice,which impedes the international communication between the newly wealthy Americans and the Europeanized Americans.In this sense,this paper focuses on an analysis of three forms of prejudice in Daisy Miller and tries to interpret Daisy’s tragic destiny from the perspective of intercultural communication.
文摘The Great Gatsby,the masterpiece of the American author Francis Scott Key Fitzgerald,is published in 1925,just after the World WarⅠ.It mainly narrates the tragic love story between Daisy and Gatsby,reflecting many social problems.This essay emphasizes on the tragic love,and introduces their tragedies respectively,especially the tragedy of Daisy,reconstructing the image of the leading lady as a victim too.Furthermore,we turn to analyze the causes of the tragic love according to the author's own experience and the background of that era.
