分区域的医学图像高容量无损信息隐藏方法

doi:10.11959/j.issn.1000-436x.2015021

Abstract

Abstract:

In view of the significant regional features of medical images,a new high capacity lossless data hiding method based on region and histogram shifting was presented.Firstly,the presented method utilized segmentation method of the maximum class separation distance to get the foreground region of medical images,and then used the polymeric polygonal approximation and image fitting algorithm to get the embedding region of region foreground.In the embedding procedure,the difference histogram circular shifting method and the code-based histogram shifting method were presented to embed hidden data in foreground and background region respectively,which improved the limit embedding capacity and resolved the overflow and underflow in traditional histogram shifting method.Experimental results show that the proposed method achieves high embedding capacity with 1 bit/pixel and stego-image quality about 40 dB.The presented method can be applied to the quality of sensitive image's large capacity information hiding with regional feature.

Key words: medical image, region, reversible data hiding, privacy protection, histogram shifting

Xiao-hong DENG,Zhi-gang CHEN,Di-qing LIANG,Yi-min MAO. Region-based lossless data hiding with high capacity for medical images[J]. Journal on Communications, 2015, 36(1): 189-198.

Figures/Tables 12

References 14

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方法	最大嵌入容量/bit
HS	25541
CHS	51082
DHS	86038
DHCS	179162

符号	含义
I	原始医学图像
max	ROI区域像素极值
ROI_I	I的ROI区域
RONI_I	I的RONI非感兴趣区域
ROI_I_B	ROI图像块集合
em_num_ROI	ROI中可嵌入的数据量
ROI_I_W	嵌入数据后ROI_I
ex_wm₁	RONI_I_W中提取的数据
R_ROI_I	恢复后ROI_I区域
sign	ROI_I预处理标志
L	差值直方图平移阈值
ROI_index	ROI区域顶点坐标
BE	电子病历的二进制形式
R_BE	ROI中未嵌完的信息
S_I	原始图像认证码
RONI_I_W	嵌入数据后RONI_I
I_w	含隐秘数据医学图像
ex_wm₂	ROI_I_W提取的数据
R_RONI_I	恢复后RONI_I区域
R_I	恢复后医学图像

载体图像	分割阈值	ROI嵌入容量/bit	sign	ROI_index长度/bit	RONI峰值个数	最大嵌入容量/bit	隐秘图像质量PSNR/dB
MRI_脚踝	106	61 571	1	108	49 256(peak=13)	160 083	38.88
MRI_脑部	60	50 843	1	144	131 882(peak=0)	314 607	40.00
MRI_宫颈	106	45 508	0	180	88 420(peak=0)	222 348	41.58
CT_肺部	129	129 771	1	108	24 213(peak=0)	178 197	38.63
CT_足部	91	43 615	1	126	145 950(peak=3)	335 515	40.17
CT_手腕	79	41 363	0	162	148 813(peak=3)	338 989	42.28

载体图像	Tan的方法		Hong的方法		本文方法
载体图像	容量	图像质量	容量	图像质量	容量	图像质量
MRI_脚踝	0.452	43.13	0.746	38.82	0.611	38.88
MRI_脑部	0.685	42.67	0.945	40.54	1.200	40.00
MRI_宫颈	0.523	43.42	0.891	41.06	0.851	41.58
CT_肺部	0.416	40.76	0.768	38.67	0.686	38.63
CT_足部	0.713	42.96	0.958	40.43	1.287	40.17
CT_手腕	0.724	44.12	0.974	42.87	1.294	42.28

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Region-based lossless data hiding with high capacity for medical images

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