Medical image degradation has a significant impact on image quality, and thus affects human interpretation and the accuracy of computer-assisted diagnostic techniques. Unfortunately, Ultrasound images are mainly degraded by an intrinsic noise called speckle. Therefore, despekle filtering is a critical preprocessing step in medical ultrasound images. In this paper we propose a new image denoising technique based on the combination of bilateral filter and stationary wavelet transform. The main contribution of this paper is in the use of a new neighborhood relationship to develop a new multiscale bilateral filter. Experimental results validated the effectiveness and the accuracy of the proposed filter in speckle noise reduction and edge preservation for medical ultrasound images.

Olive oil is the most popular product derived from Olea europaea L. due to its organoleptic characteristics and its beneficial effects on human health. Nowadays, there is a growing interest in olive oil enrichment with medicinal plants. In this regard, Artemisia absinthium L. is an edible source of antioxidants. The aim of the present study was to improve the oxidative stability and the nutritional value of Organic Tunisian Chetoui Olive oil by its enrichment with the phenolic compounds in Artemisia absinthium. The enrichment carried out by maceration and ultrasound-assisted extraction did not affect the organic criteria of olive oil. The comparative study, performed during one year of storage, showed that ultrasound-assisted extraction led to the lowest final peroxide and extinction coefficient values. At the end of storage, this method increased oleic acid content and biophenol contents. Furthermore, the anti-radical activities of enriched samples were higher than the control.

In this paper, we presented a new approach for speckle noise removal based on the combination of the trilateral filter and stationary wavelet transform. The main contribution of this paper is the integration of a new robust weighting factor into the bilateral filter, to develop a new multi-scale version of the trilateral filter. The experimental results prove the performance and the effectiveness of the proposed filter in the speckle reduction and edge preservation.