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3 Table. Comparative analysis of coding efficiency JPEG JPEG X-W GLBT AGU AGU SPIHT E-CEB x32 32x32 MHV ADCTC Lenna Barbara Baboon Goldhill Peppers Patterns Lenna Barbara Baboon Goldhill Peppers Patterns Lenna Barbara Baboon Goldhill Peppers Patterns This is an adaptive analog of a dead zone quantization that results in special increasing of zeroes number for those probability models for which this is beneficial. For DCT coefficients with indices [0,0], [,0], and [0,.] (all first row of DCT coefficient block), separate sets of frequency models are used. Similarly, separate sets are used for blocks that have size up to 32x32 pixels and other ones. For coding of signs of non-zero coefficients, context modeling is used as well (see Fig. 4). ) 3) b b c 2) c a Y a b c Y Y Fig. 4. Contexts taken into account for coding sign of a non-zero coefficient Y Context ) is taken into account as follows: IF (a=0)or(b=0)or(c=0) THEN k :=2 ELSE IF num(+,a,b,c) IN [,3] THEN k :=0 ELSE k :=; The function num(+,a,b,c) calculates the number of positive values among a,b,c. Context 2) is taken into consideration as: IF (a>0)and(b>0)and(c>0) THEN k 2 :=0 ELSE IF (a<0)and(b>0)and(c<0) THEN k 2 :=0 ELSE IF (a<0)and(b<0)and(c<0) THEN k 2 := ELSE IF (a>0)and(b<0)and(c>0) THEN k 2 := ELSE k 2 :=2. a Context 3) is taken into account similarly to Context 2), in this case the value k 3 is calculated. Finally, the number of probability model for sign coding is calculated as 9k + 3k 2 + k COMPARATIVE ANALYSIS OF R-D PERFORMANCE OF THE PROPOSED CODER In this section we compare R-D performance of the proposed ADCTC coder to other known and most advanced coders. Such comparison occurs to be complex because not all coders described in literature have available executable files. Besides, performance of some coders has not been analyzed for some test images. First of all, we consider well established coders such as JPEG [4], JPEG2000 [5], and SPIHT [5]. For correctness of comparison, a version of JPEG that uses uniform quantization and fast post-filtering like one applied in [8] is used. Since we apply such JPEG variant, it produces larger PSNR than the conventional JPEG. Besides, one of the best wavelet based coder [6] (X- W 999), a coder based on lapped orthogonal transform [2] (GLBT), a coder of the same authors that operates with 8x8 blocks [9] (E-CEB) as well as our earlier coders AGU [3] and AGU-MHV [8] will be also used for comparison. The results of such a comparison for =, 0.5, and 0.25 are given in Table. ADCTC and AGU-MHV in all considered cases except one provide better performance than other coders. Note that the coder [6] is not available and the results are given as in [6]. The proposed coder ADCTC produces the results that are either better or slightly worse than AGU-MHV. This evidences in favor of high quality of the designed context models avoiding a usage of slow bit-plane coding. It is also worth noting that for JPEG and JPEG2000 decompressed image quality differ only a little (by

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