Results 81 to 90 of about 901 (179)

Damage Identification in Beams via Contourlet Transform of Shearography Modal Data

open access: yesVibration
This paper presents a novel method for damage identification in aluminum beams using the contourlet transform. Four aluminum beams were used in the study: one was undamaged, while the other three had different damage scenarios. The damage included middle
Ali Mohammad Mohammadi   +5 more
doaj   +1 more source

Contourlet Based Adaptive Watermarking for Color Images

open access: yesIEICE Transactions on Information and Systems, 2009
This paper proposes a contourlet based adaptive watermarking for color images (CAWCI). A color image with RGB space is firstly converted to its YCbCr space equivalent; a luminance (Y) image and two chrominance (Cb and Cr) images are subsequently transformed into contourlet domain respectively; the watermark is embedded into the contourlet coefficients ...
openaire   +3 more sources

Asymmetric watermarking based on Contourlet transform and subspace projection

open access: yesTongxin xuebao, 2009
For the copyright protection of the digital image,a new asymmetric watermarking method of feature subspace projection based on Contourlet transform was presented.Embedding matrix(private key) and detecting matrix(public key) were constructed differently ...
HE Mi, CHENG Li-zhi
doaj  

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