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Due to the nature of modern communications, intentional or unintentional modifications might be introduced into the images, transmitted in time or spatial domain, by a human, source encoders/decoders or the channel. Content based authentication schemes aim to verify the authenticity of the content of an image instead of the image data. Content modification is defined as the addition or deletion of...
Magnetic resonance images (MRI) are often the most powerful diagnostics tool in medicine. They are especially useful for brain examination where precise differentiation of various tissues is possible with the goal of discovering abnormalities. Different abnormalities appear in images as regions with different features. In this paper we propose a software framework for segmentation of abnormalities...
In this paper we propose a method for automatic collimation border rotation angle detection. Algorithm utilizes pooling of image gradients based on their orientations to form a histogram of oriented gradients (HOG) with the goal of determining the dominant gradient orientation in the image as collimation border rotation angle. To avoid accumulation of lower magnitude gradients only a percentage of...
As radiographic imaging is one of the most used medical imaging modalities, it has been a subject of various research in the domains of image processing and computer vision. Expert annotated databases are needed to enable easier algorithm development, validation and verification. From algorithm development standpoint, image information such as the existence and position of collimation, existence of...
Ultrasound medical images are very important component of the diagnostics process. They are widely used since ultrasound is a non-invasive and non-ionizing diagnostics method. As a part of image analysis, edge detection is often used for further segmentation or more precise measurements of elements in the picture. Edges represent high frequency components of an image. Unfortunately, ultrasound images...
Recognition of humans based on characteristic eye features has taken a significant place in security and identification systems in the past two decades. The complex pattern of the iris, that is unique to an eye, makes iris a great biometric descriptor. The first step in the process of the biometric identification based on iris is its localization in an image. The shape of the iris, its size, position,...
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