[Studies on digital watermark embedding intensity against image processing and image deterioration].
[Studies on digital watermark embedding intensity against image processing and image deterioration].
复制标题
数字水印嵌入强度对抗图像处理和图像劣化的研究
DOI：
10.6009/jjrt.kj00000922394
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Hironao Kawashima
中科院分区：
文献类型：
--
作者：
Masato Nishio;Y. Ando;N. Tsukamoto;Hironao Kawashima
为了将数字水印应用于医学图像，需要在水印嵌入强度和图像质量恶化之间找到一个折衷。在这项研究中，水印被嵌入在4种类型的模态图像，以确定水印强度，对图像处理的鲁棒性，和由于嵌入图像恶化之间的相关性。结果表明，通过最低有效位插入方法嵌入的水印在图像处理上变得无法检测和识别，即使嵌入的水印具有可能导致图像劣化的强度。另一方面，通过离散余弦变换嵌入的水印即使在图像处理之后也被清楚地检测和识别，而不管嵌入强度如何。不影响诊断的最大包埋强度水平因模态类型而异。预计将患者信息与机构信息一起嵌入作为水印将有助于维护患者信息，防止图像混淆，并识别执行测试的机构。同时使用对图像处理抵抗力较低的水印使得可以检测是否已经执行任何图像处理。
In order to apply digital watermarking to medical imaging, it is required to find a trade-off between strength of watermark embedding and deterioration of image quality. In this study, watermarks were embedded in 4 types of modality images to determine the correlation among the watermarking strength, robustness against image processing, and image deterioration due to embedding. The results demonstrated that watermarks which were embedded by the least significant bit insertion method became unable to be detected and recognized on image processing even if the watermarks were embedded with such strength that could cause image deterioration. On the other hand, watermarks embedded by the Discrete Cosine Transform were clearly detected and recognized even after image processing regardless of the embedding strength. The maximum level of embedding strength that will not affect diagnosis differed depending on the type of modality. It is expected that embedding the patient information together with the facility information as watermarks will help maintain the patient information, prevent mix-ups of the images, and identify the test performing facilities. The concurrent use of watermarking less resistant to image processing makes it possible to detect whether any image processing has been performed or not.