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An experimental study is presented of the effect of wavelength on the shape and morphology evolution of micro holes ablated on stainless steel surface by a 10ps Q-switched Nd:VAN pulsed laser. Two routes of hole development are associated with the visible (532nm) and near-infrared (1064nm) laser beams, respectively. The evolution of various geometric shapes and morphological characteristics of the...
The surface potential gradient is a critical design parameter for planning overhead lines, as it determines the level of corona loss (CL), radio interference (RI), and audible noise (AN). The majority of existing models for surface gradient calculation are based on analytical methods which restrict their application in simulating complex surface geometry. This article proposes a novel method which...
Facial landmark detection is an essential module in many face related applications and it often appears as the most time consuming part in face processing pipeline. This paper proposes a fast and effective method for facial landmark detection using Haar cascade classifiers and a simple 3D head model, which not only detects the position of landmark points but also gives an estimation of head pose such...
Nowadays large populations worldwide are suffering from eye diseases such as astigmatism, myopia, and hyperopia which are caused by ophthalmologically refractive errors. This paper presents an effective approach to computer aided diagnosis of such eye diseases due to ophthalmologically refractive errors. The proposed system consists of two major steps: (1) image segmentation and geometrical feature...
The surface shape and microstructure of images, especially digital images, have important influence to construct such characteristics as analysis, transformation and compression to the images, etc. The main purpose of this paper is to use the fractal dimension and multifractal spectra to analyze the characteristics of the images. We will first give a brief description of Fractal Theory and then, the...
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