TECH

Impulse (salt-and-pepper) noise The PDF of (bipolar) impulse noise is given by ……(1) If b > a, gray-level b will appear as a light dot in the image. Conversely, level a will appear like a dark dot. If either  or   is zero, the impulse noise values woll resemble salt-and-pepper granules randomly distributed over the image. … Read more

Uniform Noise The PDF of uniform noise is given by                                                                                           … Read more

Exponential noise The PDF of exponential niose is given by                                      ….(1) Where a > 0. The mean and variance of this density function are                            … Read more

Erlang (Gamma) Noise  The PDR of Erlang noise is given by (1) Where the parameters are such that a>0, b is a positive integer and “!” indicates factorial. The mean and variance of this density are given by                                               … Read more

Rayleigh noise The PDF of Rayleigh noise is given by   (1) The mean and variance of this density are given by                                                                                                                       ……(2) and                                                           … Read more

Gaussian Noise:  Because of its mathematical tractability in both the spatial and frequency domains, Gaussian (also called normal) noise models are used frequently in practice.   In fact, this tractability is so convenient that it often result. Gaussian models being used in situation in which they are marginally applicable at best.   The PDF of … Read more

Image Degradation And Restoration Model :-  As fig. show, that degradation process is modeled as a degradation function that, together with an additive noise term, Operates on an input Image f(x,y), to produce a degraded image g(x,y), some knowledge about the degradation function H and some knowledge about the additive noise term n(x,y), the objective of restoration is … Read more

Image Restoration :-  Image restoration is the operation of tating a corrupt/noise image and estimating the clean original image. Corruption may come in many forms such as motion blur, noise and camara mis focus. Image restoration is performed by revirsing by the process that blurred the image and such is performed by imaging a point … Read more