نتایج جستجو برای: portal images image enhancement multiresolution image quality
تعداد نتایج: 1364915 فیلتر نتایج به سال:
Introduction: Electronic portal imaging devices (EPIDs) provide two- and three-dimensional planar and volumetric cone beam images to improve the accuracy of radiation treatment delivery. Periodic quality assurance (QA) of EPIDs is essential for dosimetric verification in radiotherapy. In this study, a QA program was implemented to evaluate the function of the EPID to be confident in applying co...
With regard to the improvement of image quality, image enhancement is an important process to assist human with better perception. This paper presents an automatic image enhancement method based on Artificial Bee Colony (ABC) algorithm. In this method, ABC algorithm is applied to find the optimum parameters of a transformation function, which is used in the enhancement by utilizing the local an...
Image fusion can synthesize many images from different sensors into a picture which can meet specific application by using a mathematical model. It can effectively combine the advantages from different images and improve the analysis ability (Blum et al., 2005). In recent years, the image fusion in automatic target recognition, computer vision, remote sensing, robots, medical image processing a...
In this paper a new inpainting scheme applicable to images with wide missed regions is presented. The proposed method is based on a new modification of the well known geodesic path image inpainting algorithm. Furthermore, to achieve a high-quality inpainting preserving details and textures, the image is decomposed firstly into texture and structure sub-images. Then, each sub-image is conc...
In this chapter, the authors provide an overview of state-of-the-art image enhancement and restoration techniques for underwater images. Underwater imaging is one of the challenging tasks in the field of image processing and computer vision. Usually, underwater images suffer from non-uniform lighting, low contrast, diminished color, and blurring due to attenuation and scattering of light in the...
The notion of a multiresolution support is introduced. This is a sequence of boolean images, related to signi cant pixels at each of a number of resolution levels. The multiresolution support is then used for noise suppression, in the context of image ltering, or iterative image restoration. Algorithmic details, and a range of practical examples, illustrate this approach.
Introduction: An efficient method of tomographic imaging in nuclear medicine is positron emission tomography (PET). Compared to SPECT, PET has the advantages of higher levels of sensitivity, spatial resolution and more accurate quantification. However, high noise levels in the image limit its diagnostic utility. Noise removal in nuclear medicine is traditionally based on Fourier decomposition o...
Volume 2 Issue 5 May 2014 Page 1 ABSTRACT This paper has focused on the different image enhancement techniques. Image enhancement has found to be one of the most important vision applications because it has ability to enhance the visibility of images. It enhances the perceivability of poor pictures. Distinctive procedures have been proposed so far for improving the quality of the digital images...
The radiotherapy is a widely used and effective method for cancer treatment where a highenergy beam is targeted at the tumor volume. To properly deliver the required radiation to the tumor and to prevent surrounding tissue from destruction, the beam has to be shaped as prescribed by the physician. This requires registration of two images: a reference image and an image obtained during the radia...
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