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Many state-of-the-art query-by-humming (QBH) systems restrict the hummed query to be in isolated syllables for easy note segmentation. However, it is observed that users often prefer natural humming. This work addresses note onset detection for natural hum, usually considered difficult to segment. The acoustic characteristics of naturally hummed signals are studied and features useful to note onset...
A method of encryption for embedding secret information in the spatial and frequency domains of a cover audio signal is described. The method permutes the secret data according to the pseudorandom sequence, generated through pseudorandom sequence generator. The permuted data is then broken into blocks of 128 bits and further encrypted using the Logistic map whose initial value is derived from 128-bits...
The paper studies the effect of registration on fusion of remote sensed SPOT images. The SPOT-PAN and SPOT-XS images are registered using a wavelet-based multiresolution registration algorithm which is found to give sub pixel registration accuracy. The registered images are subjected to a pixel level multispectral image fusion process using wavelet transform approach. Spectral quality assessment shows...
A single sensor equipped with a color filter array (CFA) is used in many digital still cameras to capture any of the three primary color components, R(red), G(green) or B(blue) on each pixel location, in order to reduce the hardware cost. This single band is used to generate the true RGB image. Demosicing is the process of interpolating the missed colors, which aims to reconstruct the missing colors...
Today there are many Internet sites which require only the entry by human users but unfortunately some computer softwares called bots are designed by some hackers to enter these sites and use their resources through false registration. As a result some systems named CAPTCHA have been introduced to tell apart human users and computer software. This paper introduces a new CAPTCHA method. In this method...
Watermarking algorithms have a basic requirement that the watermark amplitude should be as high as possible for robustness and at the same time the watermark should not introduce any perceptible artifacts. Thus, the design of watermarking algorithms involves a tradeoff between imperceptibility and robustness. This paper proposes a novel state of the art algorithm, which is based on wavelet and fuzzy...
This paper presents greenery and non-greenery image classification using adaptive neuro fuzzy inference system. A hybrid set of parameters involving texture and a measure of color coherence using guided (template) image, are used for the purpose of classification. These hybrid set of parameters provide good classification accuracy for greenery and non-greenery images. The performance of the system...
This paper presents a comprehensive study of the pixel-based skin color detection techniques. Two main issues of the skin detection are the selection of the best color space and skin color pixel classification algorithm. A large set of XM2VTS face database is used to examine whether the selection of color space can enhance the compactness of the skin class and discriminability between skin and non-skin...
Due to the abundantly available imaging technologies, manipulation of digital images has become a serious problem nowadays, in various fields like medical imaging, digital forensics, journalism, scientific publications, etc. In this paper, we concentrate on detection of a specific category of digital image forgery known as region duplication forgery or copy-move forgery, which is done by copying a...
The super-resolution algorithm constructs high resolution image using low resolution images. The ideal algorithm should be fast, and should add sharpness and detail, both at edges and in regions without adding artifacts. In this paper we propose a technique to yield a color super resolved image from four low resolution color images. We distinguish two major phases: registration and interpolation....
Echocardiogram is one of the effective diagnostics tool for cardiac investigations. Artifacts such as speckle, grating lobes, and shadowing in ultrasound images can hamper experts interpretation and impede automated analysis. This is because noise and artifacts cause edges to manifest themselves in different ways from the typical definition; hence they pose challenge to conventional edge detection...
Infrared Imaging is a totally non-invasive, non-contact, medical imaging procedure for detecting and monitoring various diseases and physical injuries. It diagnoses abnormal areas in the body by measuring heat emitted from the skin surface and expressing the measurements into a thermal map called thermograms. Abnormalities manifest as hot spots in thermograms. Thermologist has to interpret thermograms,...
In this paper, a new notion of image segmentation using Markov random field (MRF) model learning feature is addressed. The segmentation problem is formulated as pixel labeling problem in a supervised framework. MRF model is employed to model the class labels. This model learns a given training image derived from a class of images. The model having learnt is validated for other images of the same class...
Face recognition is a complex numerical technology in computer systems that can assist recognition of human faces using principal component analysis (PCA) by comparing the given facial uniqueness with the already available face database. Human faces are usually straight, so they can be treated as 2D images relatively rather than 3D. The 2D facial image can be transformed into a 1D vector of pixels...
Radiography is one of the oldest and most widely used NDT methods for the detection of volumetric defects in welds and castings. Radiographic films are chosen to record the images, due to higher resolution and their flexible usability for any kind of job. When digitized any radiographic image is characterized by three parameters, viz., optical density, contrast, resolution. Of these parameters, resolution...
Active contours are used extensively in computer vision and image processing applications, such as to locate object boundaries and object recognition etc. In this paper active contour and gradient vector models have been implemented and comparative study has been made with respect to their accuracy in describing the object and robustness to changes of model parameters and user defined parameter values.
The growing availability and widespread use of digital multimedia information and personal wireless communication devices have motivated development of several video compression standards over the past two decades. H.264/AVC (advanced video coding) is the newest international video coding standard approved by ITU-T as Recommendation H.264 and by ISO/IEC as International Standard 14496-10 (MPEG-4 part...
In JPEG2000, significant bit coding performs the main part of bitplane coding. Scan strategy of wavelet coefficients, which directs coder to generate good autocorrelation significant bit sequence, is one of the key factors to conduce to high compression ratio. Stripe scan is adopted by JPEG2000. Hilbert curve is one of popular space filling curves (SFC). However, the scan pattern of stripe scan and...
An efficient image compression technique based on simple arithmetic operations "arithmetic compression system" is enhanced by incorporating repeat reduction. It has been observed that the performance of the new method is better in many cases especially for face images. Significant improvement is achieved for low PSNR requirements. Encoding and decoding is also very fast because it operates...
A new adaptive single pixel based lossless intra coding technique employs pixel based DPCM(Differential Pulse Code Modulation) is presented as an enhancement of H.264/MPEG-4 AVC(Advanced Video Coding) standard.. In this paper, we have addressed a technique to trace a single significant pixel in the source block adaptively based on perceptual considerations, applied pixel wise DP CM for spatial prediction...
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