Dağıtık Sıkıştırmalı Video Algılama için Basit ve Uyarlanabilir bir Veri Hızı Kontrolü Tasarımı

Sıkıştırmalı Algılama, düşük karmaşıklıklı video kodlama imkanı sunduğu için, kablosuz duyarga ağları gibi kaynak-kısıtlı cihazlar gerektiren ortamlar için oldukça uygundur. Ancak, ağ üzerinde oluşan veri yükü geleneksel video kodlama yöntemleri ile kıyaslandığında oldukça fazladır. Dolayısıyla, sıkıştırmalı algılamalı kodlayıcı-kodçözücüler için düşük hesaplama karmaşıklıklı basit bir tasarım ile veri hızı kontrolünün gerçekleştirilmesi önemlidir. Bu makalede, literatürde dağıtık video kodlama uygulamaları için önerilmiş olan video geriçatım kalitesi anlamında etkin bir sıkıştırmalı algılamalı kodlayıcı-kodçözücü kullanılarak düşük karmaşıklı bir veri hızı kontrol mekanizması önerilmiştir. Önerilen tasarım geri bildirim kanalı kullanmamakta ve dolayısıyla kodlayıcının yüksek karmaşıklıklı eniyileme problemi çözümünü beklemesi gerekmemektedir. Önerilen tasarım ile kabul edilebilir ölçüde (6%) Video PSNR kalite kaybına karşılık dikkate çeker ölçüde (~43%) veri hızı kazanımı sağlandığı gösterilmiştir.

Anahtar Kelimeler:

Sıkıştırmalı algılama, Dağıtık video kodlama, Veri hızı kontrolü, Uyarlanabilir veri hızı, Video geriçatım kalitesi

A Simple and Adaptive Data Rate Control Scheme for Distributed Compressive Video Sensing

Providing fast video encoding, Compressive Sensing has been very suitable for the schemes which require power-constraint devices such as in wireless sensor networks. However, resulted data load on the network is extremely high and accomplishing rate control on these compressive sensing codecs by a simple scheme is crucial. In this paper we propose a simple scheme of data rate control mechanism for an existing compressive sensing codec for distributed video coding which has been reported as an efficient framework in terms of video reconstruction quality. Our approach does not use a feedback channel from decoder which avoids encoder to wait for high-complexity optimization problem. Embedding the proposed scheme to the codec architecture, we have obtained ~43% gain in data rate with an acceptable decrease (6%) in Video PSNR.

Keywords:

Compressive sensing, Distributed video coding, Rate control, Adaptive sampling rate, Video quality,

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