Speckle noise in displays
Abstract
Two main types of speckle noise encountered in laser and microwave ranging systems are considered: (1) noise arising from the superposition by intensity of N-independent, fully developed speckle patterns; and (2) noise occurring with the coherent superposition of a diffuse beam and a plane wave beam. An expression is derived for the minimum detectable gray level which is observable as a function of the speckle noise present in the imagery. In a principal system, the origin of the speckle treated here is due to the reflection of a monochromatic wave by some diffuse object, including the convolving effect of the input scanning or other aperture effect.
- Publication:
-
Journal of the Optical Society of America (1917-1983)
- Pub Date:
- November 1976
- DOI:
- 10.1364/JOSA.66.001282
- Bibcode:
- 1976JOSA...66.1282G
- Keywords:
-
- Electromagnetic Noise;
- Laser Range Finders;
- Microwave Imagery;
- Radar Imagery;
- Rangefinding;
- Speckle Patterns;
- Coherent Electromagnetic Radiation;
- Density Distribution;
- Diffuse Radiation;
- Interferometry;
- Monochromatic Radiation;
- Plane Waves;
- Probability Density Functions;
- Superposition (Mathematics);
- Communications and Radar