实际工程中工件厚度变化的范围比数字成像器件所能记录的范围更大时，数字图像就会有灰度饱和或者灰度阴暗的区域，造成工件薄或厚处细节的损失。提出了一种基于变剂量扫描的X射线图像增强技术。该方法通过对工件进行连续的不同X射线剂量下的透照，获得一组序列图像。选取序列图像中包含信息最丰富的子图进行拼接融合，得到最终的增强图像。试验证明，此方法简单有效，图像增强后工件薄和厚处的细节都能很好地呈现在一幅图像中，整体效果自然，对噪声控制较好，达到了X射线图像动态范围扩展的目的。

When the thickness changes of the workpiece in practical engineering are wider than the range of digital imaging, the digital image will have dark gray or gray-scale saturation region with details information loss in thin or thick of the workpiece. An image enhancement technology based on variable doses of X-ray image was proposed, in which different X-ray doses were applied to the workpiece for obtaining a sequence of images, and the most informative image blocks were selected from a sequence image splicing and used for fusion in order to get the final enhanced images. Experiments showed that this method was simple and effective, the thin and thick parts details could be clearly presented in an image after enhancement, thus having good control performance of the noise and achieving the purpose of expanding the dynamic range of X-ray images.