Digital Watermark method suitable for teleradiology in aspect of watermark tolerance and image degradation

数字水印方法在水印容差和图像退化方面适用于远程放射学

• 批准号: 16591224
• 负责人: ANDO Yutaka
• 金额: $ 1.98万
• 依托单位: National Institute of Radiological Sciences
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16591224/
• 关键词: digital watermark; JPEG compression; Bit swapping; Error correction; Bose-Chandhuri-Hocquenghem code; JPEG 2000; DWT; 電子すかし; すかし強度; 画質劣化; JPEG compression

In the environment of information disclosure, the general-purpose 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) and Discrete Wavelet Transform (DWT) for embedding Original image source ID.The aim of this research is to develop the optimal watermark method and preserve the diagnostic 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.We found the suitable parameter for the DCT and DWT watermark methods ; they were (1) Range = 8 or 16 in DCT method at the coefficient (1, 1) and (2) Range = 2 or 4 in DWT method at 4 or 5 divided level and section LL. We analyzed these values in aspects of the tolerance for image processing and the image degradation by the watermark.

在信息公开的环境下，JPEG/BMP等不需要特殊软件查看的通用图像格式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。为此，我们开发了两种ID嵌入方法：一种是位交换方法，用于嵌入篡改检测ID；另一种是傅立叶域的离散余弦变换(DCT)和离散小波变换(DWT)的数据叠加方法，用于嵌入原始图像源ID。本研究的目的是在保持图像诊断性能的情况下，发展最优的水印方法。水印包含患者和机构的信息。在医院，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，并使用比特互换方法来检测变化。合适的DCT系数为(1，1)和(2，2)，水印强度(范围)约为40。对于位交换方法，最优位平面是最低有效位。在纠错中，采用Bose-Chaudhuri-Hocquengem编码方法，水印的检测率提高了10%。在大多数校正中，如果原始检测率为60%，则纠错恢复100%的信息，我们找到了适合DCT和DWT水印方法的参数：(1)DCT方法在系数(1，1)处的Range=8或16；(2)DWT方法在4或5分割层和分段L1处的Range=2或4。从对图像处理的容忍度和水印对图像的退化两个方面对这些值进行了分析。

项目成果

Improvement of the detection rate in digital watermarked image against image degradation caused by image processing.

提高数字水印图像中针对图像处理引起的图像劣化的检测率。

• 发表时间: 2004
• 期刊: Proceeding of SPIE Medical Imaging 2004: PACS and ImagingInformatics 5371
• 作者: Nishio M;Ando Y;Tsukamoto T;Kawashima H;Nakamura S
• 通讯作者: Nakamura S

Improvement of digital starting pattern detection and image evaluation of digital watermarked image,

数字水印图像的数字起始模式检测和图像评估的改进，

• 发表时间: 2005
• 期刊: Proceeding of the 19th International Congress and Exhibition CARS2005, Elsevier ICS1281
• 作者: Mizuno Y;Nishio M;Ando Y;Tsukamoto N;Kawashima H
• 通讯作者: Kawashima H

[Digital時代の脳神経画像診断]共通画像フォーマットと画像の編集閲覧システム(Viewer)

【数字时代的颅神经影像诊断】常用图像格式及图像编辑查看系统（Viewer）

• 发表时间: 2005
• 期刊: MEDICINA 42(3)
• 作者: E.Sato;R.Germer;H.Obara;E.Tanaka;H.Mori;T.Kawai;T.Inoue;A.Ogawa;M.Izumisawa;T.Ichimaru;K.Takahashi;S.Sato;K.Takayama;安藤裕
• 通讯作者: 安藤裕

Improvement of the detection rate in digital watermarked image against image degradation casused by image processing

提高数字水印图像对图像处理引起的图像劣化的检测率

• 发表时间: 2004
• 期刊: PACS and Imaging Informatics : Basic Principles and Applications 2^<nd> ed. 5371(61)
• 作者: Masato Nishio;Yutaka Ando etc.
• 通讯作者: Yutaka Ando etc.

医用画像の電子化と保存

医学图像的数字化和存储

• 发表时间: 2004
• 期刊: 臨床と薬物治療 23(1)
• 作者: Harashima;K;Mitsuhasi;N.(6名中5番目);日下部 きよ子;安藤裕
• 通讯作者: 安藤裕