Review the use of transmission losses to network losses

042_ConcealmentAwareEncoding/ConcealmentAwareEncoding.tex

@@ -226,7 +226,7 @@ Thus, in order to achieve higher reconstruction quality, different approaches sh
 
 This section presents the general architecture proposed for \ac{ec}-aware video encoding, describing its main functional blocks, and providing an introduction for the subsequent detailed descriptions.
 Figure~\ref{FIG5:BlockDiagram} illustrates the architecture of the proposed \ac{ec}-aware encoding scheme.
-After the video encoder, it includes data loss simulation at the \ac{nal} for every slice. Subsequently, \ac{ec} is applied to the simulated losses in order to find the best methods that should be used to reconstruct the lost slices in case of transmission errors.
+After the video encoder, it includes data loss simulation at the \ac{nal} for every slice. Subsequently, \ac{ec} is applied to the simulated losses in order to find the best methods that should be used to reconstruct the lost slices in case of  errors and packet loss.
 Saliency-weighted \ac{ec} mode decision is used to select the optimal \ac{ec} mode from the best trade-off between \ac{ec} distortion, using the original input video~($f$) as reference, and the number of bits required for signalling.
 Then, the optimal \ac{ec} mode is sent to the decoder along with the mismatch residue computed as a difference between the transmitted and recovered frames.
 Finally, the scalable extension of the \ac{hevc} standard is used to encode this residue information.
@@ -421,8 +421,8 @@ Realistic conditions were used for transmission, by allowing independent losses
 \label{SEC4:IntraPerformance}
 
 In this section the performance of the proposed method is evaluated only for intra frames, in order to demonstrate its efficiency in reducing error propagation.
-Since intra \acs{cu} result in higher amount of bits, they also require a higher number of packets, making them more prone to transmission errors and losses.
-Results indicate that for an intra-period of 16 frames, approximately 42\% of the packets correspond to intra coded slices, which is a non-negligible probability of one of them being hit by transmission errors.
+Since intra \acs{cu} result in higher amount of bits, they also require a higher number of packets, making them more prone to errors and data loss.
+Results indicate that for an intra-period of 16 frames, approximately 42\% of the packets correspond to intra coded slices, which is a non-negligible probability of one of them being hit by transmission errors which would lead to packet loss.
 Moreover, by limiting the proposed method to intra frames, the amount of required overhead is reduced.
 In this case  a constant $\lambda_0=10$  was used, without taking into consideration saliency estimation. This value results from an exhaustive search targetting acceptable quality gains with a low overhead (i.e., average overhead under 5\%).
 
@@ -708,7 +708,7 @@ For instance, in comparison with the method in \cite{DualFrameME2015} the propos
 Results in Table~\ref{tab:overall_gain_ratio} also show that the small loss of coding efficiency in error-free transmission is clearly surpassed by the quality gains under error-prone transmission conditions.
 The methods in \cite{ROPERefGenJan2010,DualFrameME2015} are based on modified predictions, while the method in \cite{VPxResiliencePCS2016} uses redundant data without any further optimisation.
 Both of these approaches require low additional computational complexity.
-However, as observed in the results shown in Table~\ref{tab:overall_gain_ratio}, the lower additional complexity also corresponds to lower quality gains in case of transmission errors.
+However, as observed in the results shown in Table~\ref{tab:overall_gain_ratio}, the lower additional complexity also corresponds to lower quality gains in case of packet loss.