Color image encryption by using Arnold transform and color-blend operation in discrete cosine transform domains

2011 ◽  
Vol 284 (1) ◽  
pp. 123-128 ◽  
Author(s):  
Zhengjun Liu ◽  
Lie Xu ◽  
Ting Liu ◽  
Hang Chen ◽  
Pengfei Li ◽  
...  
Keyword(s):  
Discrete Cosine Transform ◽  
Image Encryption ◽  
Color Image ◽  
Arnold Transform ◽  
Color Image Encryption ◽  
Cosine Transform ◽  
Transform Domains

Color Image Encryption Based on the Multiple-Order Discrete Fractional Cosine Transform and Chaos in YCbCr Space

2012 ◽  
Vol 182-183 ◽  
pp. 1839-1843
Author(s):  
Xian Zhe Luo ◽  
Nan Run Zhou ◽  
Qing Min Zhao ◽  
Jian Hua Wu
Keyword(s):  
Image Encryption ◽  
Color Image ◽  
Color Space ◽  
Human Vision ◽  
Transmission Channel ◽  
Color Image Encryption ◽  
Cosine Transform ◽  
Ycbcr Color Space ◽  
Pixel Value ◽  
Encryption Method

Based on the theory that a color image can be decomposed into three primary components and each one can be seen as a gray image, we propose a color image encryption method with multiple-order discrete fractional cosine transform (MODFrCT), which is a kind of encryption with the secrecy of pixel value and pixel position simultaneously. The complex number mode that has a real part and an imaginary one is used in this encryption method to save the transmission channel. Human vision is more sensitive to the Y component than to other two components in YCbCr color space and this color format is used for encrypting the color image. Chaos is introduced to scramble the image phases both in spatial and transformation domains. The numerical simulations demonstrate the validity and efficiency of this scheme and the robustness of the method against occlusion attack is examined.

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