Quality Assessment of Error Protection Schemes for Wireless JPEG2000
|Author(s):||Muhammad Imran Iqbal, Hans-Jürgen Zepernick|
|Title:||Quality Assessment of Error Protection Schemes for Wireless JPEG2000|
|Organization:||Blekinge Institute of Technology|
|Department:||School of Engineering - Dept. of Electrical Engineering (Sektionen för ingenjörsvetenskap - Avd. för elektroteknik)
School of Engineering S-371 79 Karlskrona
+46 455 38 50 00
|Authors e-mail:||firstname.lastname@example.org, email@example.com|
|Abstract:||Wireless imaging services suffer large impairments due to the hostile nature of the wireless channel. Given the limited and expensive channel bandwidth and the high data demanding nature of these services, it becomes a challenging task to provide high quality of service in such error prone channels. Clearly, suitable error protection is necessary in order to maintain sufficient quality of these services under various channel conditions. In this report, therefore, we have investigated different channel error protection schemes for a wide range of channel conditions and coding rates. Two unequal error protection (UEP) schemes have been examined for JPEG2000 images exploiting useful features of the JPEG2000 codestream and using the error protection tool set provided by wireless JPEG2000 (JPWL). Taking the importance of the initial codestream packets on the reconstruction of the image at the receiver into account, the first scheme uses all the additional bandwidth resources in protecting the initial packets of the codestream. The rest of the packets, which are of relatively low importance, are transmitted without any parity symbols assigned to them. In the second UEP scheme, the initial parts of the codestream are strongly protected by assigning them an increased amount of parity symbols. In addition, the tail packets of the codestream are also protected but using a weaker error control code compared to the initial packets.
The performance of the proposed UEP schemes has been investigated in terms of the peak signal-to-noise ratio as a typical fidelity metric and three perceptual quality metrics, namely, the Lp-norm, the structural similarity index, and the visual information fidelity criterion. Numerical results of the proposed UEP schemes have been compared with conventional equal error protection (EEP) over additive white Gaussian noise (AWGN) channel as well as Rayleigh fading channel in the presence of AWGN. The results reveal the superior performance of the suggested UEP schemes compared to EEP over a range of channel signal-to-noise ratios and code rates.
|Keywords:||Wireless imaging, UEP, SSIM, VIF, Lp-norm, NHIQM, wireless JPEG2000, HVS.|
|Note:||Reviewed by Benny Lövström|