Abstract In the information age, network security has gradually become a potentially huge problem, especially in medical field, it is essential to ensure accuracy and safety of images, patient needs be included with minimal change. Combined log-polar transform (LPT) discrete cosine (DCT), novel robust watermarking algorithm for proposed. It realized lossless embedding into images. process featu...

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. ...

Foveal vision has been used as a way for sampling and reducing the amount of data in Cartesian images for vision systems. For this sampling, there are different approaches as the Log Polar Transform, the Exponential Cartesian Geometry and the Foveal Wavelet Transform between others. In this paper a new approach to obtain the foveal sampling and its application to single object tracking is prese...

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...

we present observation of polar coronal hole plumes with foot point jets that shows evidence of longitudinal acceleration. the series of event, occurring in the north coronal hole on 10 july 2010, was observed by the aia telescopes of the solar dynamic observatory (sdo mission) in the euv lines, with unprecedented details. the structures along the plume show a propagating outward velocity of ab...

A modification of iris recognition algorithm using Hermite transform to find iris key points has been developed. The iris image mask for the areas free of eyelids, eyelashes and glares is constructed. The key points are found inside the masked iris region. The use of eye rotation compensation based on Polar Hermite Transform before iris parameterization makes the method more effective. The prop...

This paper describes the development of an anthropomorphic visual sensor with retina-like structure to perform the polar mapping. The sensor consists of a dove prism for image rotation and a linear CCD sensor with 512 pixellline resolution, and holds approximately 45 Kbytes of image data. The retina-like sensor has variable resolution with increasing density towards the center of the visual fie...

This paper presents a study of the morphological slope transform in the complete lattice framework. It discusses in detail the interrelationships between the slope transform at one hand and the (Young-Fenchel) conjugate and Legendre transform, two well-known concepts from convex analysis, at the other. The operators and transforms of importance here (hull operations, slope transform, support fu...