Dct coefficient
A Novel Lossy Compression using 8x8 DCT Coefficient Matrix
... using DCT are implemented in lossy compression ...8x8 DCT Coefficient ...the DCT Transform gave better outcome to the extent properties like RMS blunder, image power and execution time is ...
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Detection of shifted double JPEG compression by an adaptive DCT coefficient model
... in DCT coefficient ...of DCT coefficients after JPEG compression followed the generalized Benford's law and stated that double JPEG compression could be detected because it would cause vio- lations ...
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A REVIEW OF IMAGE SECURITY WITH STEGANOGRAPHY USING DCT COEFFICIENT AND ENCRYPTION
... In the mid 1998s the rise of the internet & multimedia techniques has prompted increasing interest in hiding data in digital media. Early research concentrated on watermarking to protect copyrighted multimedia ...
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Face Detection based on Skin Color in Image by Neural Networks
... each DCT based feature vector for the presence of either a face or non face ...1xn DCT coefficient vectors of neuron from each image either face or non face image , the hidden layers has n neurons , ...
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A Robust Video Watermarking Scheme using DWT and DCT
... Digital data is easily available in the form of images and videos, over the internet. Consequently, the increased importance of digital content invites new challenges for securing the distribution of digital media. This ...
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A two-stage algorithm for the early detection of zero-quantized discrete cosine transform coefficients in High Efficiency Video Coding
... quantized DCT coefficients in HEVC was proposed in this ...1D DCT has a tendency to distribute a large frac- tion of the signal energy into a relatively few ...
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IMAGE SECURITY ENHANCEMENT BY A DUAL PROCESS WITH J-STEG AND RSA ALGORITHM
... JSteg algorithm replaces LSBs of quantized Discrete Courier Transform (DCT) coefficients. In this process the hiding mechanism skips all coefficients with the values of 0 or 1. This algorithm is resistant to ...
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Comparative Analysis of Hybrid DKT DCT with DKT and DCT in Image Compression
... DCT coefficients are used for JPEG compression. It separates the image into parts of differing importance. It converts a signal or image from the spatial domain to the frequency domain. It can separate the image ...
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Impact on Image Retrieval with Successive Truncation of DCT
... the DCT domain for the JEPG image ...partial DCT coefficients for the feature vector calculation[29] ...dimensional DCT is used for the one dimensional signal processing for example speech ...2-D ...
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Scaled Discrete Cosine Transform (DCT) using AAN Algorithm on FPGA
... the DCT calculation. The implemented DCT core can calculate input data in range –128 to 127 as ...the DCT is calculation, to concentrate the high important information into a less number of ...
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Volume 2, Issue 7, July 2013 Page 445
... b. Select two coefficients from each 8×8 DCT block as per Fig. 1 and denote them as coeff1 and coeff2 respectively. When the watermark is inserted in low frequency coefficients then it reduces the image quality ...
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PLACEMENT AND SIZING OF DISTRIBUTED GENERATORS IN DISTRIBUTED NETWORK BASED ON LRIC AND LOAD GROWTH CONTROL
... AC DCT coefficients for information embedding, and map them to different steganographic value as in the F5 method [4]: odd positive coefficients and even negative coefficients represent steganographic one; even ...
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A Robust DCT based Digital Image Watermarking using Random Mid band Coefficient Exchange Scheme for Gray Scale Images
... that DCT coefficients of middle frequencies have similar ...that DCT (u1, v1) – DCT (u2, v2) ...8x8 DCT of image in taken in which “1” is decoded if DCT (u1, v1) > DCT (u2, ...
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Multifocus and multispectral image fusion based on pixel features using discrete cosine harmonic wavelet transformed and morphological filter
... the DCT coefficients in a way similar to that of DFT coefficients except for the conjugate operation in placing the coefficients symmetrically (as DCT is ...
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Review on Digital Watermarking Images
... using DCT is proposed in ...fifteen DCT (Discrete Cosine Transform) coefficients of the face images (logo) are converted into binary ...the DCT sub-blocks, these binary bits are ...
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A Comparative Study of Image Compression Techniques
... In DCT the image is processed in blocks of size 8x8 of different frequencies. DCT is generally used for the process of JPEG images. It is again a lossy image compression technique where compressed block is ...
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Colour Contrast Enhancement Method by Scaling the DC Coefficients in CIE LAB Colour Space
... compressed DCT domain is scaling the DC coefficient in DCT domain ...DC coefficient scaling method in the Y-Cb-Cr colour space and DC coefficient scaling in CIE-Lab colour space for ...
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A Parallel Reconfigurable Architecture for DCT of Lengths N=32/16/8
... 32point DCT, using recursive sparse matrix decomposition and makes use of the symmetries of DCT basis ...of DCT is obtained to meet the low complexity ...approximate DCT of a 32-point ...
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Embedding and Extracting Digital Watermark Based on DCT Algorithm
... ward DCT is used to convert the image block information into the coefficient frequency domain matrix, and then the inverse DCT is used to transform the watermarked coefficient matrix into the ...
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Image Compression Algorithms under JPEG with Lapped Orthogonal Transform and Discrete Cosine Transformation
... Abstract:- This Paper Focus On Image Compression.It is used specially for the compression of images where tolerable degradation is required. With the wide use of computers and consequently need for large scale storage ...
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