The choice of an optimal feature detector-descriptor combination for image matching often depends on the application and the image type. In this paper, we propose the Log-Polar Magnitude feature descriptor-a rotation, scale, and illumination invariant descriptor that achieves comparable performance to SIFT on a large variety of image registration problems but with much shorter feature vectors. ...

We address the denoising of images contaminated with multiplicative noise, e.g. speckle noise. Classical ways to solve such problems are filtering, statistical (Bayesian) methods, variational methods, and methods that convert the multiplicative noise into additive noise (using a logarithmic function), apply a variational method on the log data or shrink their coefficients in a frame (e.g. a wav...

The Digital Image processing applications like medical imaging, satellite imaging, Biometric trait images etc., rely on multipliers to improve the quality of image. However, existing multiplication techniques introduce errors in the output with consumption of more time, hence error free high speed multipliers has to be designed. In this paper we propose FPGA based Recursive Error Free Mitchell ...

This paper presents Local Log-Euclidean Covariance Matrix (LECM) to represent neighboring image properties by capturing correlation of various image cues. Our work is inspired by the structure tensor which computes the second-order moment of image gradients for representing local image properties, and the Diffusion Tensor Imaging which produces tensor-valued image characterizing the local tissu...

This paper presents a novel approach to change detection in synthetic aperture radar (SAR) images based on image fusion and fuzzy clustering. The proposed approach use mean-ratio image and log-ratio image to generate a difference image by image fusion technique. In order to enhance the information of changed regions and background information in the difference image is based on the wavelet fusi...

Background: CYP2D6 is polymorphically expressed enzyme that show marked interindividual and interethnic variation. Phenotyping of CYP2D6 provides valuable information about real-time activity of this important drug-metabolizing enzymes through the use of specific probe drugs. The aim of this study was to identify the CYP2D6 oxidation phenotype with dextromethorphan (DEX) as a probe drug in Maza...

Image similarity measure has been widely used in pattern recognition and computer vision. We usually face challenges in terms of rotation and scale changes. In order to overcome these problems, an effective similarity measure which is invariant to rotation and scale is proposed in this paper. Firstly, the proposed method applies the log-polar transform to eliminate the rotation and scale effect...

This paper proposes a zero-video watermark scheme based on 2D-DWT and pseudo 3D-DCT, otherwise Singular Value Decomposition and log-polar transform are applied. The method makes no changes to original images while embedding the owner information of images so as to achieve high transparency. The log-polar transform ensures that the method is robust to rotation operations. In order to achieve the...

This paper presents a parallel algorithm for the weighted distance transform and the nearest feature transform of an n n binary image. We show that the algorithm runs in O(log n) time using n2= logn processors on the EREW PRAM and in O(log log n) time using n2= log log n processors on the common CRCW PRAM. We also show that the algorithm runs in O(n2=p2 + n) time on a p p mesh and in O(n2=p2 +(...

In this paper, we summarize our analysis of the large log of multilingual image searches in Flickr provided to iCLEF 2009 participants, focusing on the UAIC group.