NDLI: Robust image hashing via colour vector angles and discrete wavelet transform

Content Provider	IET Digital Library
Author	Tang, Zhenjun Dai, Yumin Zhang, Xianquan Huang, Liyan Yang, Fan
Abstract	Colour vector angle has been widely used in edge detection and image retrieval, but its investigation in image hashing is still limited. In this study, the authors investigate the use of colour vector angle in image hashing and propose a robust hashing algorithm combining colour vector angles with discrete wavelet transform (DWT). Specifically, the input image is firstly resized to a normalised size by bi-cubic interpolation and blurred by a Gaussian low-pass filter. Colour vector angles are then calculated and divided into non-overlapping blocks. Next, block means of colour vector angles are extracted to form a feature matrix, which is further compressed by DWT. Image hash is finally formed by those DWT coefficients in the LL sub-band. Experiments show that the proposed hashing is robust against normal digital operations, such as JPEG compression, watermarking embedding and rotation within 5°. Receiver operating characteristics curve comparisons are conducted and the results show that the proposed hashing is better than some well-known algorithms.
Starting Page	142
Ending Page	149
Page Count	8
ISSN	17519659
Volume Number	8
e-ISSN	17519667
Issue Number	Issue 3, Mar (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ipr/8/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ipr.2013.0332
Journal	IET Image Processing
Publisher Date	2013-10-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Algebra Bicubic Interpolation Colour Vector Angle Computer Vision And Image Processing Technique Cryptography Discrete Wavelet Transform DWT Feature Matrix Filtering Method in Signal Processing Gaussian Low-pass Filter Gaussian Processes Image And Video Coding Image Coding Image Colour Analysis Image Watermarking Integral Transforms Interpolation Interpolation And Function Approximation JPEG Compression LL Subband Low-pass Filter Matrix Algebra Nonoverlapping Blocks Numerical Analysis Receiver Operating Characteristic Curve Robust Image Hashing Statistics Watermarking Embedding
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering Computer Vision and Pattern Recognition Software

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