数字水印技术是用信号处理的方法在声音，图像或视频等数字化多媒体数据中嵌入隐蔽信息的行为。

Digital watermarking is the technology that embeds secret information into digital multimedia data such as sound, image or video by using signal processing technology.

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结论CR作为一种全新的影像学成像技术，以其高清晰度的图像质量，有效地实现了X线平片的数字化。

Conclusion CR as a new radiology technique, it achieved to transform the traditional X-ray into digital information with high distinct picture quality.

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目的研究直接数字化影像技术诊断根尖周微小病损的能力以及图像处理技术对诊断结果的影响。

Objective the purpose of this study was to investigate the performance of direct digital radiography, with and without image processing, for the detection of periapical lesions.

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