An image is a three-dimensional scene viewed in twodimension. Any unrequired information present in an image can be called as an image noise. Noise can be introduced in an image during various steps like during capturing an image, processing an image, transmission of an image etc. Introduction of the noise into an image is independent of the content present in it. In order to remove this noise, understanding of the noise is very essential, if the noise pattern is understood then a suitable filtering technique can be applied to eliminate the unwanted information and also retaining the essential information of an image. Work has been carried out in this field of identifying noise by several authors but still there are few constrains which are briefed out in our work. In our work we have considered two forms of noises namely Impulse noise and Electronic noise.