نهان‌نگاری تصویر دیجیتال مقاوم در برابر برش با استفاده از جدول سودوکو در حوزه مکان و تبدیلات

روش‌های هوشمند در صنعت برق

مقاله 2، دوره 7، شماره 27، آبان 1395، صفحه 13-26   

نوع مقاله: مقاله پژوهشی

نویسندگان

شادی صانعی¹؛ علیرضا نقش^{* 2}

¹کارشناس ارشد - دانشکده مهندسی برق، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف آباد، اصفهان، ایران

²استادیار - دانشکده مهندسی برق، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران

چکیده

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.

کلیدواژه‌ها

نهان نگاری تصویر دیجیتال؛ جدول سودوکو؛ حوزه مکان؛ حوزه تبدیلات؛ برش

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