Simulations over AWGN and Rayleigh channels, at various signal-to-noise ratios, verify the excellent performance of this novel APEL-turbo scheme. Performance comparisons were carried out between turbo coded APEL, JPEG, and BMP image files. To provi

由于光线分布不均匀或斑块噪音干扰等原因,往往使所要处理的指纹的灰 度值分布缺乏均匀性。在指纹特征自动识别提取过程中,造成许多传统的算法在局部出 现很大的误差。利用方差和均值特征的自动提取方法,首次对不均匀灰度图像进行自适 应分割。然后通过对图像分区域进行不同程度的自适应调整,使具有相同属性的像素单 元具有近似的灰度值分布。调整结果的灰度均匀水平与预先指定的调整精度成正比。这 种调整不仅提高了图像分割的自适应性,而且进一步扩大了一般阈值算法的应用领域。-Gray value d

In the existing bilateral filtering algorithm, the domain parameters and range parameters need to be predefined. Parameters of a bilateral filter are fixed and cannot guarantee to be optimal. A new adaptive bilateral filtering (ABF) is proposed i