Spatially refined inter-sequence error concealment for a multi-broadcast receiver using frequency selective approximation

Abstract

Mobile reception of digital TV often suffers from severe signal degradations. Inter-sequence error concealment reconstructs lost image blocks of a distorted high-resolution TV signal by inserting corresponding error-free blocks from a low-resolution reference TV signal. It is well-suited for application in future automotive multi-broadcast receivers and can outperform state-of-the-art methods by up to 15 dB PSNRY depending on the quality of the reference signal. In this contribution, we show that inter-sequence error concealment can be improved by approximating inserted blocks jointly with neighboring pixels according to a well-known frequency selective method. The reconstruction quality can be significantly increased especially in case of low-bitrate reference signals. Inserted blocks can be further refined also for high bitrates. On average, a gain of 1.7 dB PSNRY can be achieved. The peak gain which is evaluated on frame basis even reaches 5.6 dB PSNRY.

Difference image extrapolation for spectral completion in inter-sequence error concealment

“…It is either a purely resized (R) or a both resampled true-to scale and cropped (RC) version of the high-resolution signal. The associated decimation step is described in [7].…”

“…The parameters for spatio-temporal image registration and SR ISEC are given in [6] and [7], respectively. FSE for ISEC-SC uses 400 iterations, an attenuation factor 'Y = 0.2 and the isotropic model P = 0.8.…”

“…To overcome this drawback of ISEC, we suggested in 2010 to refine inserted blocks by jointly approximating them with neighbor ing blocks of the high-resolution signal according to a well-known frequency selective principle (SR-ISEC, [7]). SR-ISEC increases the reconstruction quality of ISEC mainly for low bitrates of the ref erence signal showing a mean gain of 1.7 dB and a peak gain of 5.6 dB PSNRy.…”