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Development of the digital securewatermark for teleradiology environment

远程放射学环境数字安全水印的开发

基本信息

批准号：
14570877
负责人：
ANDO Yutaka
金额：
$ 2.56万
依托单位：
KEIO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

In the environment of information disclosure, the generalipurpose image format such as JPEG/BMP that does not require special software for viewing is suitable for carrying medical image information individually. These formats have no way to know patient information. We have therefore developed two kinds of ID embedding methods : one is Bit-swapping method for embedding Alteration detection ID and the other is data-imposing method in Fourier domain using Discrete Cosine Transform (DCT) for embedding Original image source IDThe aim of this research is to develop the optimal watermark method and preserve the diagnositic performance of the image. The watermark has the information of the patient and institution. At a hospital, the embedded image can point the original image by the watermark and detect the alternation of the image.We used the discrete cosine transform (DCT) method for the preservation of the ID and the bit swap method for detection of the alternation. The suitable coefficients of DCT were (1,1) and (2,2) and the strength of watermark (Range) was about 40. For the bit swapping method the optimal bit plane was the least significant bit. In the error correction, the detection ratio of a watermark gain 10% by the Bose-Chaudhuri-Hocquenghem code method. In the majority correction, if the raw detection rate is 60%, the error correction recovered the 100% information. There were no definite merits of the correction in the scramble method. It depended upon the image processing.We used the majority correction method and the BCH code method to increase the detection ratio of watermark information, we could gain the detection ratio (40%) for the raw detection ratio (60%) by the error correction.

在信息公开的环境下，不需要专门的软件进行查看的通用图像格式，例如JPEG/BMP，适合于单独携带医学图像信息。这些格式无法了解患者信息。因此，我们开发了两种ID嵌入方法：一种是位交换的方法嵌入变更检测ID和另一种是在傅立叶域使用离散余弦变换（DCT）的数据强加的方法嵌入原始图像源ID。本研究的目的是开发最佳的水印方法，并保持图像的诊断性能。水印具有患者和机构的信息。在医院中，嵌入的图像可以通过水印指向原始图像，并检测图像的变化，我们使用离散余弦变换（DCT）方法来保存ID，使用位交换方法来检测变化。合适的DCT系数为（1，1）和（2，2），水印强度（Range）为40左右。对于位交换方法，最佳位平面是最低有效位。在纠错中，采用Bose-Chaudhuri-Hocquenghem码方法，水印的检测率提高了10%。在多数校正中，如果原始检测率为60%，则错误校正恢复了100%的信息。在扰乱方法中，校正没有明确的优点。这取决于图像处理，我们采用多数校正方法和BCH码方法来提高水印信息的检测率，通过纠错可以将原始检测率（60%）提高到检测率（40%）。