Düşük işlem yüküne sahip hareket kestirimi için tümlev imge temelli ikilileştirme

Yıl 2018, Cilt: 24 Sayı: 5, 850 - 856, 12.10.2018

Aysun Taşyapı Çelebi Oğuzhan Urhan

Öz

Günümüzde
yüksek çözünürlüklü televizyonlar, kameralar, akıllı telefonların kullanımı ile
birlikte yüksek çözünürlüklü video uygulamalarına talep duyulmaktadır. Bu
cihazlardaki güç tüketimi ve sınırlı hafıza gibi kısıtlardan dolayı da düşük
işlem yüküne sahip video kodlama yöntemlerine ihtiyaç artmaktadır. Video
kodlama standartlarında halen en fazla işlem yükü hareket kestirimi
kısmındadır.  Bu çalışmada düşük işlem
yüküne sahip, düşük bit derinliği gösterimi temelli bir hareket kestirimi
yöntemi önerilmektedir. Bu yaklaşımda video çerçeveleri tümlev imge
kullanılarak etkin bir şekilde ikilileştirilmekte ve video çerçevelerinin iki
bit ile gösterimi elde edilmektedir. Elde edilen ikili çerçeveler üzerinden geleneksel
mutlak farklar toplamı (SAD) yerine donanıma daha uygun olan dışaran veya (EX-OR)
operasyonu kullanılarak uyumlama işlemi yapılmaktadır. Hareket kestiriminde
ikilileştirme işlemi gerçekleştirirken tümlev imge kullanılması ilk kez bu
çalışmada önerilmektedir. Önerilen yöntem, literatürde mevcut olan 1-bit dönüşüm
(1BT) temelli yaklaşımlara kıyasla hareket kestirim doğruluğunu geliştirirken
iki‑bit dönüşüm temelli yaklaşımların başarısı ile hemen hemen aynı seviyede
olmaktadır. Bunun yanında özellikle ikilileştirme aşamasında bu yöntemlerin işlem
yükünü azaltmaktadır.

Anahtar Kelimeler

Tümlev imge, İkilileştirme, Düşük bit derinliği, Hareket kestirimi

Integral image based binarization for low-complexity motion estimation

Öz

Today, high resolution video applications are
demanded with the use of high resolution televisions, cameras, smart phones.
The requirement for low processing load video coding methods increase due to
constraints such as power consumption and limited memory in these devices. In
video coding standards, most of the processing load still originates from the
motion estimation part. In this study, a low bit‑depth representation based
motion estimation method that has low computational load is proposed. In this
approach, video frames are binarized efficiently by using integral image and the
representation of video frames in terms of two bits is performed. Matching
operation is carried out on these binary image frames using hardware‑friendly
EX-OR operation instead of conventional SAD (Sum of Absolute Difference This
study is the first attempt of using the integral image for the binarization
process in the motion estimation. While the proposed method improves the motion
estimation accuracy compared to the 1BT based approaches available in the
literature, it provides similar motion estimation performance with the two‑bit
depth based approaches. Additionally, it reduces the processing load of these
methods, especially during the binarization phase.

Anahtar Kelimeler

Integral image, Binarization, Low bit-depth, Motion estimation

Kaynakça

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