MPEG-4 is a method of defining compression of audio and video digital data. MPEG-4 videos double compression method is used to decompress video from spatial domain to the frequency domain and then resaved with a different quantization matrix. Markov feature is a second order statistics which was adopted to detect double compression artifacts in the original video. In proposed system, double com...

This paper presents an objective metric for the perceived quality of low bit rate compressed video. Frames are decomposed into several frequency bands at multiple scales and a motion detection algorithm is used to segment moving and nonmoving regions. The distance between the decompositions of the reference and distorted video sequences is used to estimate a frame distortion. The pooled error a...

Mel-frequency cepstral coefficients are used as an abstract representation of the spectral envelope of a given signal. Although they have been shown to be a powerful descriptor for speech and music signals, more accurate and easily interpretable options can be devised. In this study, we present and evaluate the shape-based spectral contrast descriptor, which is build up from the previously prop...

C o n s i d e r a b l e r e s e a r c h has been d e v o t e d t o t h e deve lopment o f methods f o r r e d u c i n g t h e t r a n s m i s s i o n b a n d w i d t h o f v i d e o s i g n a l s such t h a t t he r e c o n s t r u c t e d image i s o f a h i g h q u a l i t y . T y p i c a l l y , t h e s e methods p e r f o r m a s t a t i s t i c a l e n c o d i n g o f t h e i n t e n s i t...

In this paper, we present two multistage compression techniques to reduce the test data volume in scan test applications. We have proposed two encoding schemes namely alternating frequency-directed equal-run-length (AFDER) coding and run-length based Huffman coding (RLHC). These encoding schemes together with the nine-coded compression technique enhance the test data compression ratio. In the f...

A modification and extension of Kortum and Geisler's model [Vision Res. 35, 1595 (1995)] of early visual non-linearities that incorporates an expansive nonlinearity (consistent with neurophysiological findings [Vision Res. 35, 2725 (1995)], a normalization based on a local average retinal illumination, similar to Mach's proposal [F. Ratliff, Mach Bands: Quantitative Studies on Neural Networks i...

BACKGROUND High quality chest compression is one of the key factors in successful resuscitation. A high standard of training is therefore decisive. We aimed to investigate the strengths and weaknesses of teaching chest compression in a study designed to highlight where targeted improvements in the quality of our chest compression training can and must be made. METHODS Retrospective analysis o...

In this paper a novel hybrid image compression technique is proposed. This technique inherits the properties of localizing the global spatial and frequency correlation from wavelets and classification and functional approximation tasks from modified forward-only counterpropagation neural network (MFOCPN) for image compression. Several benchmark test images are used to investigate usefulness of ...

In [1] the authors introduced a technique for generating mismatched pulse compression filters for linear frequency chirp signals. The technique minimizes the sum of the pulse compression sidelobes in an p L –norm sense. It was shown that extremely constant sidelobe levels (better than 60 dB) can be achieved for minimal mismatch loss and broadening of the compression peak. This paper reports on ...

10.1 INTRODUCTION Pulse compression involves the transmission of a long coded pulse and the processing of the received echo to obtain a relatively narrow pulse. The increased detection capability of a long-pulse radar system is achieved while retaining the range resolution capability of a narrow-pulse system. Several advantages are obtained. Transmission of long pulses permits a more efficient ...