تشخیص شات برای ویدیو HEVC/H.265

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه کامپیوتر، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران

2 گروه کامپیوتر، واحد شیراز، دانشگاه آزاد اسلامی، شیراز، ایران.

3 دانشکده مهندسی برق و کامپیوتر، دانشگاه تهران، تهران، ایران

چکیده

رشد سریع تعداد و حجم ویدیوها باعث شده که ویدیوها به‌صورت فایل فشرده ذخیره و ردوبدل شوند. امروزه، نمایه‌گذاری، جستجو و بازیابی فایل فشرده ویدیو از اهمیت بالایی برخوردار است. اولین گام در تحلیل، جستجو و بازیابی ویدیو، قطعه‌بندی زمانی ویدیوها، به مجموعه‌های معنادار و قطعه‌های قابل مدیریت یا همان شات است. در سال‌های اخیر استاندارد جدید فشرده‌سازی ویدیو H.265 به وجود آمده است که نیاز به گسترش و تولید روش‌هایی جهت تحلیل و بازیابی ویدیو در این استاندارد شدیداً احساس می‌گردد. در این مقاله روشی برای قطعه‌بندی زمانی و تشخیص شات در ویدیو فشرده‌شده با استاندارد H.265 بدون غیر فشرده‌سازی کامل با استفاده از نوع خاصی از اطلاعات کدگذاری یعنی پرچم­های تبدیل که تا کنون استفاده نشده ارائه‌ شده است. در این روش مقادیر ضرایب غیر صفر پرچم­های ماکرو بلوک‌های تبدیل قاب‌ها، که در سرایند رشته بیت فشرده وجود دارد محاسبه و در نهایت با یک آستانه مناسب، مرز شات تشخیص داده می‌شود. آزمایش‌ها نشان می‌دهد روش ارائه‌شده با دقت 80% و فراخوانی 3/84 % بدون غیر فشرده‌سازی ویدیو، شات‌ها را تشخیص دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Shot detection in HEVC/H.265 video

نویسندگان [English]

  • Mostafa Rayati Fard 1
  • Mahdi Mehrabi 2
  • Mohammad Ghanbaei 3
1 Department of Computer, Shiraz Branch, Islamic Azad University, Shiraz, Iran
2 Department of computer engineering, Shiraz branch,, Islamic Azad university, Shiraz, Iran.
3 School of Electrical and Computer Engineering, University of Tehran, North Kargar St., Tehran, Iran
چکیده [English]

The huge number and volume of video and video usage have caused most of them saved and transferred as compressed video. Nowadays, indexing, searching and retrieving video directly in compressed domain has been taken great attention. The first step in video indexing and retrieval is segmenting a video into chronological sets and manageable pieces or shots. In recent years, a new video coding standard say H.265 has been introduced and it is needed to develop the methods and algorithms for analyzing, indexing and retrieving H.265 compressed video. In this paper, a novel method has been proposed for shot detection in H.265 compressed video without full decompression. In the proposed method, macro block coding information which is in headers of compressed H.265 bit-stream by a threshold is used for shot detection of compressed video. The results indicate that the proposed method detect video shots in H.265 video by 80% accuracy and 84/3% recall.

کلیدواژه‌ها [English]

  • HEVC/H.265
  • compressed domain
  • shot detection
  • video segmentation

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