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Table 2 Output accuracy percentage computation

From: Power-optimized log-based image processing system

Number of output bits Percent of error
Wallace tree multiplier Logarithm-based multiplier
Logarithm word size in bits
6 bits 9 bits 12 bits 15 bits 18 bits 21 bits
22 40.9% 58.02% 44.8% 25.63% 18.53% 7.91% 3.86%
20 40.23% 51.17% 32.11% 18.13% 11.68% 6.87% 3.15%
18 38.56% 30.89% 26.41% 13.28% 9.13% 5.31% 2.74%
16 36.85% 29.13% 18.95% 9.58% 5.18% 2.68% 2.03%
15 35.03% 11.16% 7.58% 5.91% 2.86% 1.98% 1.06%
13 33.26% 8.19% 5.39% 3.32% 1.86% 0.93% 0.58%
11 31.68% 5.11% 2.68% 2.53% 1.03% 0.49% 0.26%