基于對比敏感度的DASH客戶端碼率選擇算法研究
doi: 10.11999/JEIT160150
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1.
(西南交通大學(xué)信息科學(xué)與技術(shù)學(xué)院 成都 611756) ② (ECE Department, University of Massachusetts, Dartmouth, MA 02747, USA)
基金項目:
國家自然科學(xué)基金(61401374)
Rate Selection Algorithm of DASH Client Based on Contrast Sensitivity
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1.
(School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China)
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2.
(ECE Department, University of Massachusetts, Dartmouth, MA 02747, USA)
Funds:
The National Natural Science Foundation of China (61401374)
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摘要: 基于帶寬估算的碼率選擇算法具有帶寬利用率高的優(yōu)點，但是同時也存在容易受網(wǎng)絡(luò)波動影響造成計算出的目標(biāo)碼率出現(xiàn)瞬時峰值而造成帶寬浪費(fèi)的問題。針對于此，該文提出一種基于人眼對比敏感度特征的碼率選擇算法，在客戶端利用人眼對比敏感度模型計算當(dāng)前觀看條件下人眼截止空間頻率，選擇服務(wù)器中和截止空間頻率差的絕對值最小視頻分片對應(yīng)的碼率作為目標(biāo)碼率。和基于帶寬估算選擇目標(biāo)碼率的方法進(jìn)行對比實驗，測試二者在不同視角內(nèi)計算的目標(biāo)碼率，得到兩者的碼率計算結(jié)果階梯圖。實驗結(jié)果表明，在視角為5到15情況下，所提方法較帶寬估計方法在確保視頻效果前提下能夠有效節(jié)約帶寬。
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關(guān)鍵詞:
- 對比敏感度 /
- 截止空間頻率 /
- DASH(Dynamic Adaptive Streaming over Http) /
- 碼率選擇
Abstract: One significant advantage of rate selection algorithms based on bandwidth estimation is the high bandwidth utilization rate. They are, however, vulnerable to network bandwidth fluctuations, leading to appearance of rate instantaneous peak value and hence wasting unnecessary bandwidth consumption. To tackle the problem above, this paper proposes a novel rate selection algorithm based on the contrast sensitivity of human eyes, where in the client eyes cutoff spatial frequency under the current viewing conditions is calculated by using the human contrast sensitivity model. The algorithm selects the rate of video fragment which has the minimum absolute difference value to the spatial frequency computed, stored in server as the target rate. Compared with those methods for calculating the target rate based on bandwidth estimation and testing target rate in different angles, the proposed method gets the ladder diagrams of rate calculation of both methods. Experimental results demonstrate that the proposed algorithm is able to save a considerable amount of bandwidth without the loss of video quality, with viewing angle from 5 to 15. -
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