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Directional Interpolation of Lost Block Using Difference of DC values and Similarity of AC Coefficients  

Lee Hong Yub (LG전자 디스플레이 사업부)
Eom Il Kyu (밀양대학교 정보통신공학부)
Kim Yoo Shin (부산대학교 컴퓨터 및 정보통신연구소)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.6C, 2005 , pp. 465-474 More about this Journal
Abstract
In this paper, a directional reconstruction of lost block in image over noisy channel is presented. DCT coefficients or pixel values in the lost blocks are recovered by using the linear interpolation with available neighboring blocks that are adaptively selected by the directional measure that are composed of the DDC (Difference of DC opposite blocks)and SAC(Similarity of AC opposite blocks) between opposite blocks around lost blocks. The proposed directional recovery method is effective for the strong edge and texture regions because we do not make use of the fixed 4-neighboring blocks but exploit the varying neighboring blocks adaptively by the directional information in the local image. In this paper, we describe the novel directional measure(CDS: Combination of DDC and SAC) composed of the DDC and the SAC and select the usable block to recover the lost block with the directional measure. The proposed method shows about 0.6dB PSNR improvement in average compared to the conventional methods.
Keywords
block recovery; difference of DC; similarity of AC; directional interpolation;
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