这个过程即称为 图像的直方图增强(histogram enhancement)，也称为 直方图变换(histogram transform) 常用的直方图增强方法有：直方图均衡化 (histogram equalization)和直方图规定化 (histogramshaping)。
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Based on the Discrete Cosine Transform (DCT) coefficient histogram difference sequences of JPEG images, a new steganalytic method was proposed to realize the steganalysis of JPEG MB2.
基于JPEG图像的离散余弦变换（DCT）系数直方图差值序列，提出一种新的检测JPEG MB2隐写术的方法。
The improved PRI transform estimates PRI with high precision, overcomes the sub-harmonic problem produced in the histogram methods, and has a better performance on anti-jitter.
改进的PRI变换法克服了直方图统计法的子谐波问题，对脉冲重复间隔具有很高的估计精度，且具有一定的抗抖动能力。
The aim of specification is to transform the histogram of an original image to a specified histogram capable of highlighting certain gray level ranges in the image.
规定化的目的是将原图像的直方图转变为规定的直方图，以便突出一定灰度范围内的图像。
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