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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 69 for “"Discrete Cosine Transform"”.
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Character extraction from ancient Chinese stele using discrete cosine transform
<p>"The discrete cosine transform (DCT) was applied to locate Chinese characters in ink rubbings of ancient Chinese steles (stone slabs with inscribed characters) in order to extract the characters by creating a bounding box in the image reconstructed by the inverse DCT. This work is a …
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Hardware implementation of a low-power two-dimensional discrete cosine transform
… compliant, low-power dedicated, two-dimensional, Discrete Cosine Transform (DCT) core meeting all IBM Softcore requirements is developed. Power is optimized completely at the algorithmic, architectural, and logic levels. The architecture uses row-column decomposition of a fast 1-D algorithm …
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A comparison of discrete cosine transform and discrete wavelet transform algorithm in watermarking against common attacks
… there is no comparison documented done between Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT). In this report, the DCT watermarking algorithms and DWT watermarking algorithms were compared based on robustness and imperceptibility criteria. With DCT, the watermark bits were …
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Design and analysis of Discrete Cosine Transform-based watermarking algorithms for digital images. Development and evaluation of blind Discrete Cosine Transform-based watermarking algorithms for copyright protection of digital images using handwritten signatures and mobile phone numbers.
… with the development and evaluation of blind discrete cosine transform-based watermarking algorithms for copyright protection of digital still images using handwritten signatures and mobile phone numbers. The new algorithms take into account the perceptual capacity of each low frequency …
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Design and analysis of Discrete Cosine Transform-based watermarking algorithms for digital images. Development and evaluation of blind Discrete Cosine Transform-based watermarking algorithms for copyright protection of digital images using handwritten signatures and mobile phone numbers
… with the development and evaluation of blind discrete cosine transform-based watermarking algorithms for copyright protection of digital still images using handwritten signatures and mobile phone numbers. The new algorithms take into account the perceptual capacity of each low frequency …
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Fast implementation of integer transforms in H.264/AVC video encoders
The Integer Discrete Cosine Transform (IDCT) and Hadamard transforms are adopted in the H.264/AVC standard encoder for the compression of residual video signals. Other video standards such as the H.261, H.262 and H.263 use Discrete Cosine Transform (DCT).
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DATA COMPRESSION BY USING SYMMETRICAL COMPONENT TRANSFORM
… data compression for digital signals using a new transform method termed the symmetrical com-ponent transform. This transform is based on a previously described matrix expansion of a spatially discrete image termed the symmetrical component expansion. Details of the symmetrical component expansion …
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A robust digital image watermarking using repetition codes against common attacks
… watermarking scheme has been implemented using Discrete Cosine Transform (DCT). The idea of this scheme is to embed an encoded watermark using repetition code (3, 1) inside the cover image pixels based on Discrete Cosine Transform (DCT) embedding technique. The proposed methods have undergone …
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On the Low Power Design of DCT and IDCT for Low Bit Rate Video Codecs
… intensive operations in H.263 are the Discrete Cosine Transform (DCT) and the Inverse Discrete Cosine Transform (IDCT), which perform spatial compression and decompression of the data. In an ASIC implementation of H.263, the high computational complexity of the DCT and IDCT leads to …
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Iris Biometric Identification Using Artificial Neural Networks
… extraction methods that include the Fourier transform, discrete cosine transform, the eigen analysis method, and the wavelet transform, is performed. The robustness of each method, with respect to distortion and noise, is also studied.</p>
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Oil reservoir characterization using ensemble data assimilation
… of reservoir's states and parameters using discrete cosine transform is presented to improve the estimation problem and geological consistency of the results. The discrete cosine transform allows for efficient, flexible, and robust parameterization of reservoir properties and can be used to …
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Automatic Optimization of DSP Algorithms
… code. Timings are compared, using fast Fourier transform (FFT), Walsh-Hadama transform (WHT), discrete cosine transform (DCT) and discrete sine transform (DST) as the benchmarks, to those obtained by highly optimized implementations including FFTW and the WHT package. The results of this …
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Complexity management for video encoders.
… will be performed. These functions include discrete cosine transform and related functions as well as motion estimation. Adaptive complexity-reduction algorithms are proposed for computationally expensive functions: discrete cosine transform and motion estimation functions respectively. It …
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Hybrid DWT-DCT algorithm for image and video compression applications
… image/video information. There are various transformation techniques used for data compression. Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) are the most commonly used transformation. DCT has high energy compaction property and requires less computational resources. …
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Digital image transformation and compression
… image. The final algorithm consists of a Discrete Cosine Transform (DCT), quantiser, runlength coder and a statistical coder. The DCT is performed in hardware using the SGSThomson STV3200 Discrete Cosine Transform. The quantiser is specially optimised for use with high quality images. It …
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Adaptive Compression Algorithm For Full Colour Three Dimensional Integral Images
… technique is based around the three dimensional Discrete Cosine Transform. To enable accurate compression and de-compression of image data, the scanned image must be aligned coiTcctly to take advantage of the inherent structure imposed by the image capture system. A novel method of eiTor angle …
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Medical Image Registration Using Artificial Neural Network
<p>Image registration is the transformation of different sets of images into one coordinate system in order to align and overlay multiple images. Image registration is used in many fields such as medical imaging, remote sensing, and computer vision. It is very important in medical research, where …
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Sparse and Redundant Image Representations Using Adaptive Dictionaries in Digital Image Denoising
… Two different dictionaries were tested, the Discrete Cosine Transform and a learned dictionary based off of the noisy image patches. The dictionary's patch size was also varied to find the optimal patch size for denoising each image feature. Numerical and visual comparisons show the promise …
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GPU implementation of block transforms
… utilize NVIDIA CUDA GPUs to implement orthogonal transforms such as signal dependent Karhunen-Loeve Transform and signal independent Discrete Cosine Transform. GPU architecture and programming model are examined. Mathematical preliminaries of orthogonal transform, eigen-analysis and algorithms are …
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