نهان‌نگاری تصویر دیجیتال مقاوم در برابر برش با استفاده از جدول سودوکو در حوزه مکان و تبدیلات
محورهای موضوعی : انرژی های تجدیدپذیر
شادی صانعی
1
(کارشناس ارشد - دانشکده مهندسی برق، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف آباد، اصفهان، ایران)
علیرضا نقش
2
(استادیار - دانشکده مهندسی برق، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران)
کلید واژه: برش, نهان نگاری تصویر دیجیتال, جدول سودوکو, حوزه مکان, حوزه تبدیلات,
چکیده مقاله :
با توسعه سریع فناوریهای دیجیتال، حفاظت از حق تالیف و اثبات مالکیت اطلاعات اهمیت فراوانی یافته است. در نهان‌نگاری تصویر، اطلاعات داخل تصویر به نحوی جاسازی می‌شود که کیفیت بصری تصویرکاهش نیابد و گیرنده بتواند اطلاعات مورد نظر را دریافت کند. همچنین برخی از حملات مانند برش تصویر، اطلاعات نهان‌نگار را از بین می‌برند. در این مقاله طرح جدیدی برای نهان‌نگاری تصویر دیجیتال پیشنهاد شده که در مقابل حمله برش شدید مقاوم است. در این طرح از جدول سودوکوی کلاسیک که یک جدول 9×9 است، استفاده شده است. یکی از ویژگیهای جدول سودوکو این است که محدودیتهای جدول باعث شده اعداد یا سمبلها در سرتاسر جدول به صورت یکنواخت پراکنده شوند. در این روش پیشنهادی از جدول سودوکو و نهان‌نگاری مبتنی بر حوزه مکان و تبدیلات از قبیل تبدیل کسینوسی گسسته و تبدیل موجک گسسته و مزایای هر حوزه بهره برده‌ایم. عدم استفاده از راه حل جدول سودوکو در مرحله استخراج و کشف راه حل صحیح برای دستیابی به نهان‌نگار از نوآوری‌های این طرح است. مقاوم بودن این روش نهان‌نگاری در مقابل برش تا 92% درصد، عملکرد مطلوب این طرح را نشان می‌دهد.
With rapid development of digital technology, protecting information such as copyright, content ownership confirmation has become more important. In image watermarking, information of the image is inserted such that the visual quality of the image is not reduced and the receiver is able to get the required information. Some attacks such as image cropping, destroy the watermark’s information. In this article, a new watermarking scheme is proposed which is robust against tough cropping. In the proposed scheme, classic Sudoku table which is a 9*9 table, has been used. One feature of Sudoku table is that Sudoku's limitations cause uniform scattering of symbols or numbers throughout the table. In the proposed scheme, Sudoku table and both watermarking approaches based on spatial domain and transform domain such as DCT and DWT are used. Lack of using of soduko solution at the stage of extraction and finding correct solution to obtain watermark, is innovation of this scheme. Robustness of watermarking against cropping attack is up to 92%, which shows good and effective performance of the proposed scheme.
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