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In the fingerprint recognition application utilizing more information other than minutiae is much helpful. We present here a fingerprint matching scheme based on transform features and their comparison. The technique described here obviates the need for extracting minutiae points to match fingerprint images. The proposed scheme uses Discrete Cosine Transform (DCT), Fast Fourier Transform (FFT) and...
We can improve image compression by downsampling the image prior to encoding process and estimated the missing portion after decoding at low bit rates. This paper presents a new algorithm in which, based on the adaptive decision of appropriate downsampling ratios, quantization steps and interpolation we can achieve high quality of coding by consideration of local visual significance at low bit rates...
Multimedia applications are becoming even more demanding. Hence, the next generation codecs invariably should be floating point compliant. With the field programmable gate arrays (FPGAs) technology getting mature, more and more signal processing applications are finding their niche in FPGAs. Current generation FPGAs have got hardware multipliers. However, these are general purpose multipliers and...
A novel method based on an algorithm by Pedersen et. al. using independent component analysis and binary time-frequency masking to iteratively segregate sources from a stereo recording is proposed here to improve the quality of estimated sources and reduce artifacts (musical noise). The inspiration comes from research in auditory scene analysis which indicates that the human auditory system uses a...
In this work, we present a multimodal biometric system using speech and signature features. Speaker recognition system is built using Mel frequency cepstral coefficients (MFCC) for feature extraction and vector quantization (VQ) for modeling. An offline signature recognition system is also built using vertical and horizontal projection profiles (VPP and HPP) and discrete cosine transform (DCT) for...
Block-based discrete cosine transform is widely used in many video coding standards includes H.264. Due to the property of the discrete cosine transform, it usually introduces annoying blockiness artifacts in the reconstructed video. H.264 uses an adaptive in-loop deblocking filter to reduce the blockiness artifacts. This paper introduces an algorithm for the deblocking filter in H.264. The proposed...
In this paper, we present a novel approach to color image compression using 3-D block transforms. Unlike, most of the other color image compression schemes, the proposed scheme do not transform the highly correlated RGB color components into a decorrelated color space like YUV, YCrCb etc but uses 3-D block transforms which is applied directly on RGB color components to reduce the intercolor redundancy,...
Most of the video encryptions algorithms considered in the literature significantly increase the video size independent of encryption algorithm employed. This is because these algorithms encrypt DCTs without considering their characteristics or relationship to the visual content. This adversely affects the transmission throughput. We propose a fast video encryption algorithm that exploits the statistics...
In this paper, we propose a non-blind audio-watermarking scheme based on compression-expansion of stereo signals. We also demonstrate the general methods for embedding binary code in single channel signals and stereo signals even though there is only one possible state change. The proposed audio-watermarking method makes use of compression-expansion of adjacent frames of samples of the audio signal...
In this paper, variable image segmentation and mixed transform are used to capitalize on the narrow band and broadband signal components for image compression. A mixture of transforms can exploit the different spectral bands in an image in achieve higher compression as compared to single transforms. However, the optimal distribution of the signal into transforms. However, the optimal distribution...
This paper addresses the problem of the evaluation of inverse discrete cosine transform (IDCT) using existing radix-2 IFFT algorithm applicable for image and signal processing where a huge number of data points are required for a particular operation. Since radix-4 architecture has fewer multiplications than radix-2, then it is judicial to carry out the IDCT operation via radix-4 IFFT for a huge savings...
This paper presents the architecture and the VHDL design of an integer 2-D DCT used in the H.264/AVC. The 2-D DCT computation is performed by exploiting itpsilas orthogonality and separability property. The symmetry of the forward and inverse transform is used in this implementation. To reduce the computation overhead for the addition, subtraction and multiplication operations, we analyze the suitability...
In recent years, steganography and steganalysis are two important areas of research that involve a number of applications. These two areas of research are important especially when reliable and secure information exchange is required. Steganography is an art of embedding information in a cover image without causing statistically significant variations to the cover image. Steganalysis is the technology...
The development of an efficient and reliable multiple descriptions coding (MDC) scheme over lossy communication networks has been described. The advantage of MDC is that, if all the channels work, a high quality, possibly lossless, reconstruction can be achieved from all the received descriptions. On the other hand, a lower but still acceptable quality can be achieved if some of the channels are not...
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