تخمین حرکت مبتنی بر سرعت و جهت در فشرده‌سازی ویدیو برای کاهش محاسبات و افزایش کیفیت ویدیو
دادور حسینی اواشانق
1
(
دانشجوی دکتری، گروه مهندسی برق، دانشگاه آزاد اسلامی، واحد اهر، اهر، ایران
)
مهدی نوشیار
2
(
دانشیار، گروه مهندسی برق و کامپیوتر، دانشگاه محقق اردبیلی، اردبیل، ایران
)
سعید برغندان
3
(
دانشکده برق دانشگاه ازاد اسلامی واحد اهر
)
مجید قندچی
4
(
استادیار، گروه مهندسی برق، دانشگاه آزاد اسلامی، واحد اهر، اهر، ایران
)
الکلمات المفتاحية: پیکسل, تخمین حرکت, فشرده‌سازی, کدینگ ویدیو, HEVC.,
ملخص المقالة :
کدگذاری ویدیویی با کارایی بالا (HEVC) آخرین استاندارد کدگذاری ویدیویی است. این استاندارد با ارائه دو برابر راندمان فشرده‌سازی در مقایسه با استاندارد H.264، از فیلم‌های با وضوح بالا (HD) پشتیبانی می‌کند. محاسبات تخمین حرکت در HEVC پیچیده‌ترین قسمت از کدینگ ویدیو است که بیش‌ترین زمان کدینگ ویدیو را به این پردازش اختصاص می‌دهد. روش‌های زیادی برای کاهش زمان تخمین حرکت پیشنهاد شده که بسیاری از آن‌ها به‌صورت عملی موثر بوده است. با وجود به‌کارگیری الگوریتم‌های موثر در تخمین حرکت باز هم مقدار زمان پردازش نسبت به زمان آنی (real time) بسیار زیاد است. در این تحقیق یک الگوریتم تخمین حرکت زیر پیکسل سریع با تعداد نقاط جستجوی کمتر برای کدینگ ویدیو پیشنهاد شده است. روش پیشنهادی بر پایه مدلی از فیزیک حرکت و ویژگی‌های تصویر در قاب‌های متوالی است که از اطلاعات آماری حرکت عناصر قاب‌های دنباله‌‌ی ویدیویی استفاده کرده است. این الگوریتم با کاهش تعداد نقاط جستجو و بهبود نسبی پارامترهای کیفی ویدیو، پیچیدگی محاسبات را کاهش می‌دهد.
Reducing the number of search points in video motion estimation
Reducing the complexity of motion estimation calculations
Increasing the speed of motion estimation calculations
Increasing the quality of the final image and video: This increase in quality in terms of psnr-hvs and pevq-mos made the image better from the point of view of human vision.
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