Title :
Error concealment using directional coefficient mask and difference of DC
Author :
Lee, Hong Yub ; Eom, IL Kyu ; Kim, Yoo Shin
Author_Institution :
Dept. of Electron. Eng., Pusan Nat. Univ., South Korea
Abstract :
In this paper, an adaptive reconstruction of the lost blocks of DCT based images over unreliable channel is presented. The DCT coefficients in the lost blocks are recovered by interpolation using the available neighboring blocks that are adaptively selected using the difference of DC opposite blocks (DDC). The previous methods in the DCT domain could not yield a good quality for the edge regions because the correct estimation of direction by exploiting the DCT coefficients of correctly received neighboring blocks is difficult. Reconstruction using DDC is efficient in recovering the edge, texture and smoothness regions. And the masking of the DCT coefficient can remove unnecessary DCT coefficients. Simulation results show that the quality of the recovered image is satisfactory.
Keywords :
channel coding; data compression; discrete cosine transforms; edge detection; error correction codes; image coding; image reconstruction; image texture; interpolation; DC opposite block; DCT coefficient masking; adaptive image reconstruction; edge recovering; image quality; image texture; interpolation; unreliable channel; Bit rate; Data compression; Discrete cosine transforms; Frequency domain analysis; Hardware; Image reconstruction; Interpolation; Transform coding; Video compression; Yield estimation;
Conference_Titel :
Industrial Electronics Society, 2004. IECON 2004. 30th Annual Conference of IEEE
Print_ISBN :
0-7803-8730-9
DOI :
10.1109/IECON.2004.1432118