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We propose a fast video transcoding technique based on region-of-interest (ROI) determination. The ROIs are identified using the properties of the human visual system (HVS), applied in the compressed domain. We use the edge, motion and spatial frequency content of the video frame as the parameters in identifying perceptually important regions in the(More)
Digital Watermarking is an effective and popular technique to discourage illegal copying and distribution of copyrighted digital image information. The important attributes are the picture quality of the watermarked image (similarity to the original) and robustness to attacks such as cropping. We propose a transform-domain robust digital watermarking(More)
In this paper, the authors have presented a smartphone based robust heart rate measurement system. The system requires the user to place the tip of his/her index finger on the lens of a smart phone camera, while the flash is on. The captured video signal often contains noise generated due to (i) improper finger placement, (ii) imparting excessive pressure,(More)
Once the person's identity is established, the most important aspects of ubiquitous healthcare monitoring of elderly and chronic patients are location, activity, physiological and psychological parameters. Since smartphones have become the most pervasive computing platform today, it is only a logical extension to use the same in healthcare domain for(More)
Rate of vehicular horn is an important parameter to estimate the traffic congestion of a street in an urban area in developing nations. In this paper we propose a participatory sensing based approach for traffic condition monitoring using horn detection employing inbuilt sensors of smart phones. Feature extraction is performed on the audio captured in(More)
In this paper, we explore features related to spectral and time domain for classification of crowd noise. Spectral information is represented by mel-frequency cepstral coefficients (MFCC) and spectral flatness measure (SFM), whereas time domain information is represented by short-time energy (STE) and zero-cross rate (ZCR). For carrying out these studies,(More)