lecture11

What is noise?
Noise is any undesired information that contaminates an image. Noise
appears in image from a variety of source. The digital image a acquisition
process, which converts an optical image into a continuous electrical
signal that is then sampled, is the primary process by which noise appears
in digital images. At every step in the process there are fluctuations
caused by natural phenomena that add a random value to exact brightness
value for a given pixel. In typical image the noise can be modeled with
one of the following distribution:
1. Gaussian (“normal”) distribution.
2. Uniform distribution.
3. Salt _and _pepper distribution.
What is noise?
Noise is any undesired information that contaminates an image. Noise
appears in image from a variety of source. The digital image a acquisition
process, which converts an optical image into a continuous electrical
signal that is then sampled, is the primary process by which noise appears
in digital images. At every step in the process there are fluctuations
caused by natural phenomena that add a random value to exact brightness
value for a given pixel. In typical image the noise can be modeled with
one of the following distribution:
1. Gaussian (“normal”) distribution.
2. Uniform distribution.
3. Salt _and _pepper distribution.