Fatma El-Zahraa Abou-Chadi

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In this paper a simple and robust Contourlet-based image watermarking technique for copyright protection is presented. The main idea is to utilize the flexible representation of images provided by the Contourlet transform in designing a robust watermarking technique. The watermark is embedded into different bands to resist different kinds of signal(More)
Identifying moving objects from a video sequence is a fundamental and critical talk in many computer-vision application. It is an Important part of visual tracking system. In this paper, a new algorithm for background subtraction has been proposed and its performance wat investigated and compared. It is a combination of three background subtraction(More)
For the esophageal contractile activity recorded during swallowing, a feature extraction scheme has been developed. It recognizes the time, duration, and amplitudes of local peaks for each peristaltic wave. The method is based on the Tauberian approximation for modeling waveforms as a sum of identically shaped pulses with different time delays and(More)
This paper presents a simple Contourlet-based watermarking technique and investigates the role of Contourlet Transform (CLT) versus Wavelet Transform (WT) in achieving a high level of robustness. The same embedding strategy is adopted for both cases of CLT-based watermarking and WT-based watermarking. Experimental results show the superiority of the(More)
Analysis and classification of esophageal motility records were investigated using signal processing and fuzzy-set pattern recognition techniques. A set of parameters has been extracted from the raw records and has previously been used as characterizing features. Improvements to these procedures were obtained by extracting these features from processed(More)
Digital images are widely used in defense, e-governance, medicine, banking, insurance, healthcare, scientific research, weather forecasting etc. Varied applications in these fields demand the secure exchange of digital images that serve as valid document evidences for legal procedures and for clinical, scientific and forensic analysis. These images are(More)
In order to enhance the contrast noisy images where the amplitudes of it histogram components are very high at one location on the gray scale and very small in the rest of the gray scale, conventional global contrast enhancement schemes overequalize these images so that too bright or dark pixels are resulted and local contrast enhancement schemes produce(More)
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