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Active geometric functions were recently introduced as a tool to perform real time 3-D segmentation. In the present paper we propose a B-spline formulation of the problem, which further improves the computational efficiency of the algorithm. We also introduce local region based energies, overcoming the limitations of the original method. The feasibility of real-time 3D segmentation in challenging...
Segmentation of anatomical regions is the fundamental problem in medical image analysis. The watershed algorithm is used for the segmentation of anatomical regions and it is computationally simple. The active contour algorithm is used to extract the tumor region in the segmented image, but it suffers from computational complexity and it is insensitive to noise. The proposed method combines watershed...
The level set approach can be used as powerful tool for volume segmentation of a region-of-interest (ROI), to achieve an accurate estimation of tumor or soft tissue in medical images. A major challenge of such algorithms is required to set the equation parameters, especially in the speed function. In this paper, we introduce a geometric active surface scheme that uses level set approach for tumor...
Volume measurement of liver tumor is an important task for surgical planning and cancer following-up. The computation of this volume requires an efficient liver tumor segmentation method. This work deals with liver tumor segmentation from computed tomography (CT) images. We are interested by HMRF-EM classification method. This method considers the spatial information given by voxel neighbors. A Bootstrap...
This paper presents a new hybrid speed function needed to perform image segmentation within the level-set framework. This speed function provides a general form that incorporates the alignment term as a part of the driving force for the proper edge direction of an active contour by using the probability term derived from the region partition scheme and, for regularization, the geodesics contour term...
The presence of lymphocytic infiltration (LI) has been correlated with nodal metastasis and tumor recurrence in HER2+breast cancer (BC), making it important to study LI. The ability to detect and quantify extent of LI could serve as an image based prognostic tool for HER2+ BC patients. Lymphocyte segmentation in H & E-stained BC histopathology images is, however, complicated due to the similarity...
Cervical cancer is a preventable disease and the dysplasia it causes can be scanned by using a pap smear test. It can be beneficial to develop a computer-assisted diagnosis system to make the pap smear test robust and widespread. The most fundamental part of such a system is the segmentation of nuclei and cytoplasm in cervical cell images. The aim of this study is to segment the nuclei in such images...
Segmentation of ultrasonic breast tumor images is a challenging topic in the clinical practice. A novel coarse-to-fine active contour (CFAC) model is proposed to extract boundaries of breast tumors based on a level-set framework. To apply the CFAC model, a Gaussian pyramid is firstly constructed to represent images at different resolution levels. Then, on the top pyramid level a region-based segmentation...
The ultimate aim of this work is to provide an automatic detection of melanoma skin lesion images using a computer-aided diagnosis (CAD) system. This work presents the different steps of such a process. We detail in this paper the segmentation step by describing the different used methods in the literature and propose a hybrid approach that can be integrated in our system. We use three different methods...
In this paper we present a segmentation method based on genetic active contours (genetic snakes) that are active contour models, also known as snakes, with an energy minimization procedure based on genetic algorithms (GA). Genetic snakes have been proposed to overcome some limits of the classical snakes, as initialization and existence of multiple minima, and have been successfully applied to images...
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