Results 21 to 30 of about 152,070 (321)
DCT-Based Iris Recognition [PDF]
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2007 This paper presents a novel iris coding method based on differences of discrete cosine transform (DCT) coefficients of overlapped angular patches from normalized iris images. The feature extraction capabilities of the DCT are optimized on the two largest publicly available iris image data sets, 2,156 images of 308 eyes from the CASIA database and 2,955
Donald M, Monro +2 more
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A Coding-Based Steganography Using Multiple Frequency Domains [PDF]
مجلة جامعة الانبار للعلوم الصرفة, 2009 :In this paper, a new technique for hiding text in a bitmap images will be present. The technique based on using an index of the dictionary representing the characters of the secret messages instead of the characters themselves.
Omed Salim Khalind +2 more
doaj +1 more source
DCT-based motion estimation [PDF]
IEEE Transactions on Image Processing, 1998 We propose novel discrete cosine transform (DCT) pseudophase techniques to estimate shift/delay between two one-dimensional(1-D) signals directly from their DCT coefficients by computing the pseudophase shift hidden in DCT and then employing the sinusoidal orthogonal principles, applicable to signal delay estimation remote sensing.
U V, Koc, K R, Liu
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Hybrid blind robust image watermarking technique based on DFT-DCT and Arnold transform [PDF]
Multimedia tools and applications, 2018 In this paper, a robust blind image watermarking method is proposed for copyright protection of digital images. This hybrid method relies on combining two well-known transforms that are the discrete Fourier transform (DFT) and the discrete cosine ...
Mohamed Hamidi +3 more
semanticscholar +1 more source
Feedforward data-aided phase noise estimation from a DCT basis expansion [PDF]
, 2008 This contribution deals with phase noise estimation from pilot symbols. The phase noise process is approximated by an expansion of discrete cosine transform (DCT) basis functions containing only a few terms.
Bhatti, Jabran, Moeneclaey, Marc
core +3 more sources
Recovering Missing Coefficients in DCT-Transformed Images [PDF]
, 2011 A general method for recovering missing DCT coefficients in DCT-transformed images is presented in this work. We model the DCT coefficients recovery problem as an optimization problem and recover all missing DCT coefficients via linear programming.
Karrenbauer, Andreas +3 more
core +4 more sources
Performance analysis and optimization of DCT-based multicarrier system on frequency-selective fading channels [PDF]
, 2018 Regarded as one of the most promising transmission techniques for future wireless communications, the discrete cosine transform (DCT) based multicarrier modulation (MCM) system employs cosine basis as orthogonal functions for real-modulated symbols ...
Cao, Aijun +5 more
core +1 more source
Advances in Human-Computer Interaction, 2011 Driving is the result of a psychological process that translates data, signals and direct/indirect messages into behavior, which is continuously adapted to the exchange of varying stimuli between man, environment and vehicle.
Marco Pasetto, Stefano Damiano Barbati
doaj +1 more source
Comparison of FFT-Based and DCT-Based Channel Estimation and ECC for OFDM System [PDF]
Engineering and Technology Journal, 2015 Orthogonal Frequency Division Multiplexing (OFDM) has become a popular modulation method for high data rate wireless communications. In this paper, two schemes are proposed.
Awatif Ali Jafaar
doaj +1 more source
DCT-OFDM With Index Modulation [PDF]
IEEE Communications Letters, 2017 In this letter, index modulation (IM) is proposed for OFDM systems based on a discrete cosine transform (DCT) implementation. The new DCT-OFDM-IM scheme is shown to yield spectral efficiency improvements of up to 38% relative to OFDM-IM and up to 55% relative to OFDM while occupying the same bandwidth and maintaining similar robustness against the ...
Chafii, Marwa +2 more
openaire +3 more sources