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http://dx.doi.org/10.5626/JOK.2015.42.2.162

Geometry Transformation in Spatial Domain Using Coefficient Changes in Frequency Domain toward Lightweight Image Encryption  

Joo, Jeong Hyun (Handong Global Univ.)
Yi, Kang (Handong Global Univ.)
Publication Information
Journal of KIISE / v.42, no.2, 2015 , pp. 162-168 More about this Journal
Abstract
Image data is mostly stored in compressed form because of its huge size. Therefore, a series of cumbersome procedures is required to apply a transformation to image data: decompression, extraction of spatial data, transformation and recompression. In this paper, we employ DCT(Discrete Cosine Transform) coefficients to change the spatial presentation of images. DCT is commonly used in still image compression standards such as JPEG and moving picture compression standards such as MPEG-2, MPEG-4, and H.264. In this paper, we derived mathematically the relationship between the geometry transformation in the spatial domain and coefficient changes in the DCT domain and verified it with images in the JPEG file format. Because of the efficiency of transformation in the frequency domain, our findings can be utilized for light-weight partial image encryption for privacy data protection or entertainment contents protection.
Keywords
DCT coefficients; JPEG file transform; frequency domain change; geometry transformation; lightweight image encryption; image compression;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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