Differential Log-Likelihood (DLL) for Chromatic and Achromatic Images.

The small DLL values suggest, that the exponential power distribution fits the shape of the individual coefficient distributions well. In addition, we also report the average exponent of the exponential power family fit to the individual coefficient distributions ( corresponds to a Laplacian shape).较小的DLL值表明，指数幂分布（exponential power distribution）能够较好地拟合个体系数分布的形态。此外，我们还报告了适配于个体系数分布的指数幂族的平均指数，该指数对应拉普拉斯分布形态。