Title :
Multi-directional spatial error concealment using adaptive edge thresholding
Author :
Asheri, Hadi ; Rabiee, Hamid R. ; Pourdamghani, Nima ; Ghanbari, Mohammad
Author_Institution :
Dept. of Comput. Eng., Sharif Univ. of Technol., Tehran, Iran
fDate :
8/1/2012 12:00:00 AM
Abstract :
In this paper, a new method for spatial concealment of missing areas in image and video signals transmitted over error prone infrastructures, is presented. The concealment process is performed in three steps. First, a novel technique is used to estimate the significant edges of missing areas after performing a directional edge analysis on the correctly received neighboring blocks of the missing areas. This technique uses the moments of the neighboring edge magnitudes to obtain an adaptive threshold for rejecting non-significant directions. Second, based on the predicted significant directions, an approximation is obtained for each missing pixel. Finally, for each pixel, we compute a weighted average by using two edge correspondence measures as weighting factors. Moreover, the adaptive thresholding of the edges let us include as many edges as necessary in the interpolation process. Experiments show that the proposed method outperforms the previous state of the art methods based on both subjective and objective measures.
Keywords :
image segmentation; interpolation; video signal processing; adaptive edge thresholding; directional edge analysis; edge correspondence measures; error prone infrastructures; image signals; interpolation process; missing areas; multidirectional spatial error concealment; neighboring blocks; neighboring edge magnitudes; nonsignificant directions rejection; objective measures; subjective measures; video signals; weighted average; weighting factors; Extrapolation; Image edge detection; Image reconstruction; Interpolation; PSNR; Video coding; Weight measurement; Adaptive edge thresholding; Directional edge analysis; Directional entropy; Image and video concealment; Multi-directional spatial error concealment;
Journal_Title :
Consumer Electronics, IEEE Transactions on
DOI :
10.1109/TCE.2012.6311331