以下为句子列表：
英文: Based on the characteristics of radiographic testing images, conventional algorithms for their contrast enhancement were introduced, including global algorithms such as linear or non-linear gray stretch, histogram equalization or modification, and adaptiv
中文: 摘要根据射线图像的特点，介绍进行射线图像对比度增强的常用算法，包括线性和非线性的灰度拉伸、直方图均衡和修正等全局对比度增强方法，以及自适应局部增强方法。
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