A new protocol based on reducing ab enlarging imagesREP (reproduction/Expansion Protocol) : application : transmission and archiving for medical diagnosis

L'échange des images médicales est l'un des obstacle majeurs dans une application de télémédecine vu le grand volume de ces images et la limitation des la bande passante allouée à cette application. Pour contourner ce problème, nous adoptons un nouveau protocole de transmission des images médicales qui consiste à réduire l'image avant de l'emettre et à l'agrandir lors de la réception (protocole " REPro": Réduction Expansion ProtocoleThe exchang of medical exchange is one of the major obstacles in a telemedicin

Stratigraphie sismoséquentielle intégrée de la série jurassique dans l’Atlas central de la Tunisie

Tanfous-Amri Dorra, Bedir M., Inoubli Mohamed Hedi, Soussi Mohamed. Stratigraphie sismoséquentielle intégrée de la série jurassique dans l’Atlas central de la Tunisie. In: Documents des Laboratoires de Géologie, Lyon, n°156, 2002. STRATI 2002. 3ème congrès français de stratigraphie. Lyon, 8-10 juillet 2002. p. 224

REPro.JPEG: A new image compression approach based on Reduction/Expansion image and JPEG compression for dermatological medical images

International audienceMedical image are known for their huge volume which becomes a real problem for their archiving or transmission notably for telemedicine applications. In this context, we present a new method for medical image compression which combines image definition resizing and JPEG compression. We baptize this new protocol REPro.JPEG (Reduction/Expansion Protocol combined with JPEG compression). At first, the image is reduced then compressed before its archiving or transmission. At last, the user or the receiver decompress the image then enlarge it before its display. The obtain results prove that, at same number of bits per pixel lower than 0.42, that REPRo.Jpeg guarantees a better preservation of image quality compared to the JPEG compression for dermatological medical images. Besides, applying the REPRo.Jpeg on these color medical images is more efficient while using the HSV color space compared to the use of RGB or YCbCr color spaces

Experimental investigations of rate effects on drilling forces under bottomhole pressure

International audienceThe purpose of this study is to examine cutting speed and bottomhole pressure effects on cutting forces acting on PDC cutters during the oil and gas drilling process. A set of single cutter tests was performed in three sedimentary rocks of different permeabilities. Dry tests were carried out at atmospheric pressure and at different cutting speeds. As previously observed in the literature, these tests show that cutting forces increase with the cutting speed, especially the normal component. The same tests were performed at 20MPa bottomhole pressure. It appears that the cutting speed effect on cutting forces in the medium and low permeability rocks is moderate and weak, respectively. By contrast, rate effects in the highly permeable rock are significant and overcome rate effects observed in dry experiments by an order of magnitude. Interestingly, these observations are similar to those observed in submarines oil ploughing at high hydrostatic pressure. These results are believed to represent an important step into a deeper understanding of the oil and gas drilling process

Watermarking for Improving the Reduction-Expansion Process of Medical Images (WREPro)

Medical image is an essential component of the patient file thanks to the rich information it provides to the physician. However, the large volume of this kind of images represents a problem for information storage or exchange via a tele-diagnostic platform. In fact, these images require sufficient storage space and bandwidth rate which are often limited. To deal with this problem, we propose a compression technique to reduce the image before its storage or its transmission. Moreover, this method permits to enlarge the processed image before being displayed while preserving a good quality to ensure a good diagnosis. We call this compression technique: "REPro" (Reduction / Expansion Protocol). Although several techniques of image reduction and expansion exist in the literature,. The assemblage mapping of the final image is inserted via watermarking in the emitted reduced image. The obtained results show that the proposed approach provides better conformity between the original and reduced-magnified images, which is valid for all tested medical images

Numerical and analytical study of rate effects on drilling forces under bottomhole pressure

International audienc

Protocol for transmission and archiving of medical images (wavREPro.JPEG)

International audienceThe transmission and archiving of medical images are among the most important operations in telemedicine. Indeed, the collaboration platforms have to ensure video conferencing, medical images and patient data transfer and archiving. However, the big volume of this kind of images represents a major obstacle for the work of a tele-staff. In order to overcome this problem, we suggest a new archiving and transmission protocol that we call "wavREPro.JPEG". Its process consists of two phases. In fact, before the information broadcast, this protocol reduces images by Discrete Wavelet Transforms and compresses them by the classic JPEG. At the reception step, it enlarges images after their decompression. Experimental results have demonstrated that our proposed method is more efficient than the classic JPEG compression. Effectively, it offers more minimisation in terms of network bandwidth consumption and storage space

Effect of Gamma Irradiation on Pathogenic Staphylococcus aureus in Packaged Ready-to-Eat Salads Treated with Biological Extracts

Providing pathogen-free ready-to-eat (RTE) salads is critical for all consumers, especially individuals with weakened immunity. In this study, the efficacy of γ-irradiation on Staphylococcus aureus (S. aureus) in freshly packaged salads (4.24 log CFU/g) treated with essential oil (EO) and myrtle juice during 10 days of storage and their impact on organoleptic properties were investigated. EO was extracted by hydrodistillation and the chemical composition was analyzed by gas chromatography with Flame Ionization Detector (GC/FID) and gas chromatography/mass spectrometry (GC/MS). Myrtle juice was prepared from fresh fruits. The cytotoxic effects of Thymus capitatus (T. capitatus) EO against a normal human umbilical vein endothelial cell (HUVEC) were assessed. GC/FID and GC–MS analysis of the thyme EO revealed the presence of 13 compounds, including carvacrol (79.55%) and p-cymene (7.93%) as major components. The EO was found to be noncytotoxic, with concentrations lower than 0.16 µL/mL. A reduction of more than 3 log CFU/g and a total inactivation of S. aureus were achieved with the combination of gamma irradiation at 0.5 kGy with myrtle juice at 6 µL/mL and EO at 0.08 µL/mL, respectively. The treatment of fresh RTE salads with thyme and myrtle juice was evaluated as acceptable by the sensory panel. The combined effect showed a synergistic potential on the inactivation of S. aureus

Discrete Wavelet Transforms for PET Image Reduction/Expansion (wavREPro)

International audienceThe large volume of medical images remains a major problem for their archiving and transmission. In this context, we propose a novel protocol wavREPro that aims to minimize the image size before its storage and then to enlarge it at reception. This process has been achieved by exploiting the Discrete Wavelet Transforms (DWT) namely Haar, Le Gall (5/3) and Daubechies (9/7) wavelets. These tools represent the image in the multi-resolution domain that follows the human psycho-visual system. Therefore, the reduced image is none other than the approximation of the image. Its magnification is carried out by either cancelling the details (wavREProZ) or estimating them (wavREProED) using the DWT−1 on the reduced image. Our experiments have been conducted on a PET (Positron Emission Tomography) medical image database and the results have been presented for the three well-known color spaces RGB, HSV and YCbCr. The reported results have promoted the wavREProZ application with the Haar wavelets on RGB images since it achieved maximum fidelity between the original and reduced then enlarged images. The good performance of this approach encourages its adoption to display images on screens having different sizes

Medical Image Compression Approach Based on Image Resizing, Digital Watermarking and Lossless Compression

International audienceThe computerization of images have been important for different medical applications. Nevertheless, the huge volume of medical images can rapidly saturate transmission especially in telemedicine field and may encumber storage systems in case of local saving. Data compression represents the most used solution to deal with this problem. Indeed, it can minimize the data space and may reduce both the time of data transfer and bandwidth consumption. In this context, we have proposed new approaches, which combined image reduction and expansion techniques, digital watermarking and lossless compression standards such as JPEG-LS (JLS) and TIFF formats. We named these compression methods wREPro.TIFF (watermarked Reduction/Expansion Protocol combined with TIFF format) and wREPro.JLS (wREPro combined with JPEG-LS format). The results of comparative experiments show that we have provided significant improvements over the well-known JPEG image compression standard. Indeed, our proposed compression algorithms have ensured a better preservation of the image quality notably for high compression ratios