جاسازي ايمنِ نهان نگاره در تصوير با استفاده از كدگذاري فراكتالي - Artificial Intelligence

**Astaraki** · ۱۰-۶-۱۳۸۹, ۰۱:۲۵ بعد از ظهر

جاسازي ايمنِ نهان نگاره در تصوير با استفاده از كدگذاري فراكتالي

خلاصه مقاله:
يكي از معيار‌هاي جذابيت روش‌هاي نهان‌نگاري بستگي به ميزان تحمل‌پذيري آن‌ها در برابر اغتشاش‌هايي دارد كه در هر يك از گام‌هاي فرآيند نهان‌نگاري امكان رخداد داشته و مي‌توانند تاثيرات مخربي را بر داده نهان‌نگاري شده اعمال نمايند. پيشنهاد اين مقاله استفاده از ويژگي خود متشابهي در مفاهيم فراكتالي تصاوير، بمنظور جست‌وجوي جايگاه‌هاي ايمن مورد نياز براي جاسازي نهان‌نگاره است. در راستاي دست‌يابي به اين هدف تصوير مرجع در قالب بلوك‌هاي همپوشان و غير همپوشان تقسيم بندي گشته و تبديل مورد نظر كه خود شكل تغيير يافته‌اي از آسيب پيش بيني شده است به آن اعمال مي‌گردد. بلوك‌هاي منتخب بوسيله بردارهايي كه توانايي حفظ مختصاتِ آن‌ها را داشته باشند نشان گذاري گشته و كليدِ عمليات نهان‌نگاري را تشكيل مي‌دهند. سپس بيت‌هاي نهان‌نگاره بوسيله انجام تغييري جزئي در پيكسلِ جايگاهِ صفرِ بردارها، در آن‌ها تعبيه مي‌گردند. بر اساس نتايج حاصل از آزمون‌هاي انجام شده در مرحله پياده سازي، روش پيشنهادي از دقت قابل قبولي در مواجه با حملات هندسي به ويژه عمليات فشرده سازي برخوردار است.

كلمات كليدي:
نهان‌نگاري تصوير، كدگذاري فراكتالي تصوير، نهان‌نگاري فراكتالي، ايمني، حملات هندسي.

~~penksoci~~ · ۰۸-۱۵-۱۳۹۲, ۰۵:۴۴ قبل از ظهر

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