25-07-2012, 11:38 AM
Images
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INTRODUCTION
What is IMAGE?
Images may be two-dimensional, such as a photograph, screen display, and as well as a three-dimensional, such as a statue or hologram. They may be captured byoptical devices—such as cameras, mirrors, lenses, telescopes, microscopes, etc. and natural objects and phenomena, such as the human eye or water surfaces.
The word image is also used in the broader sense of any two-dimensional figure such as a map, a graph, a pie chart, or an abstract painting. In this wider sense, images can also be rendered manually, such as by drawing, painting, carving, rendered automatically by printing or computer graphics technology, or developed by a combination of methods, especially in a pseudo-photograph.
A volatile image is one that exists only for a short period of time. This may be a reflection of an object by a mirror, a projection of a camera obscura, or a scene displayed on a cathode ray tube. A fixed image, also called a hard copy, is one that has been recorded on a material object, such as paper or textile by photography or digital processes.
A mental image exists in an individual's mind: something one remembers or imagines. The subject of an image need not be real; it may be an abstract concept, such as agraph, function, or "imaginary" entity. For example, Sigmund Freud claimed to have dreamed purely in aural-images of dialogs. The development of synthetic acoustic technologies and the creation of sound art have led to a consideration of the possibilities of a sound-image made up of irreducible phonic substance beyond linguistic or musicological analysis.
A still image is a single static image, as distinguished from a kinetic image (see below). This phrase is used in photography, visual media and the computer industry to emphasize that one is not talking about movies, or in very precise or pedantic technical writing such as a standard.
Introduction to MATLAB:-
MATLAB (matrix laboratory) is a numerical computing environment and fourth-generation programming language. Developed by MathWorks, MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages, including C, C++, Java, and Fortran.
Although MATLAB is intended primarily for numerical computing, an optional toolbox uses the MuPAD symbolic engine, allowing access to symbolic computing capabilities. An additional package, Simulink, adds graphical multi-domain simulation and Model-Based Design for dynamic andembedded systems.
DIGITAL IMAGE PROCESSING
Digital Image Processing Technique (DIPT) is a widely used technique for image processing activities in digital communication. Its use as diagnostic tool is in recent use in many experimental researches, where emission spectroscopy plays a dominant role. In this work, we have projected DIPT as a low cost and non invasive probing technique to measure different physical parameters like energy, temperature and density of a DC Glow Discharge Plasma. The radiative emission from DC Glow Discharge Plasma is normally in the visible range along with some infrared and ultraviolet emissions. The frequency of such radiations indicates the energy of the radiation. Different radiative processes in the plasma are responsible for the frequency band of the emission. The spectral distribution depends upon the homogeneity of the plasma also. By analyzing the image of plasma we can infer the spectral distribution due to emission from different regions of the plasma. Here, we have evaluated the matrix of rgb values of pixels of the plasma image. We have developed an approximate relation of the rgb to the wavelength of the spectra. The corresponding frequency matrix is then worked out from the derived wavelength matrix. Then considering a local thermodynamic equilibrium, the energy distribution matrix, which depends upon the local atomic processes, is calculated using the above frequency matrix. The surface plot of the temperature, density and the energy of the plasma have been shown in this work.