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In a Bluetooth piconet, congestion may arise as multiple flows pass via the master node across the shared wireless channel. While packet loss and delay are common measures of congestion, within a piconet the transmitter buffer fullness is a more suitable metric, as it more directly indicates congestion and the onset of congestion. For video traffic,(More)
— In this paper we propose a fast and efficient image retrieval method for searching JPEG2000 compressed image databases. Comparing image contents of the JPEG2000 coded images in the pixel domain requires image decompression, which imposes intensive computational processes of the inverse discrete wavelet transform and the arithmetic decoding. On the other(More)
— In this paper we evaluate the performance of layered (data partitioned and SNR scalable) H.264/AVC video small contribution to the quality of the image. Based on these observations, we propose a novel adaptive turbo-code with a temporal diversity scheme for transmitting a video stream encoded by SNR scalable H.264.
We propose a new adaptive algorithm for semi-automatic video object segmentation based on joint pixel features using the undecimated wavelet packet transform (UWPT) and luminance value. The method starts with the object's boundary specification at the reference frame assisted by the user. After selecting a set of feature points which approximate the(More)
This paper presents a lossless data hiding method using integer wavelet transform. The modification of small coefficients of the high frequency subbands are used to embed data. We use the histogram modification to prepare enough space for data hiding. Data embedding is done by processing these selected coefficients of the modified subband histograms. We(More)
In this paper, we propose an adaptive object tracking algorithm in crowded scenes. The amplitudes of of undecimated wavelet packet tree coefficients for some selected pixels at the object border are used to create a feature vector (FV) corresponding to that pixel. The algorithm uses these FVs to track the pixels of small square blocks located at the(More)
Scalable multi-layered coded video requires its individual layer security, as every layer has its own characteristics i.e. bit-rate, frame rate, resolution and quality. We investigate a problem of individual layer cryptographic key management issues in scalable video coding (H.264/SVC) and propose a top down hierarchical keys generation and distribution(More)
Multi-layered scalable bit-stream distribution requires protection for the rendering and transmission of its individual layers. This paper presents a sufficient encryption (SE) scheme for SVC layers which maintains the compression efficiency and the format compliancy of scalable bit-streams, without compromising the security. The purpose of SE is achieved(More)
— In this paper, a method for enhancing low contrast images is proposed. This method, called Gaussian Mixture Model based Contrast Enhancement (GMMCE), brings into play the Gaussian mixture modeling of histograms to model the content of the images. Based on the fact that each homogeneous area in natural images has a Gaussian-shaped histogram, it decomposes(More)