Howtosignalprocessing
- How do you reduce laser speckle?
- How can speckle be reduced?
- What is meant by speckle noise?
- How does laser speckle work?
How do you reduce laser speckle?
The speckle generated by the diffuser is used to vary the phase of the illumination of the rough object. One method to reduce speckle involves scanning a beam on a diffuser rather than scanning the diffuser on the beam.
How can speckle be reduced?
These speckle effects can be reduced by signal averaging. For single detector LIDAR, averaging over many transmitter pulses can reduce speckle but this technique also reduces temporal resolution.
What is meant by speckle noise?
Speckle noise is the noise that arises due to the effect of environmental conditions on the imaging sensor during image acquisition. Speckle noise is mostly detected in case of medical images, active Radar images and Synthetic Aperture Radar (SAR) images.
How does laser speckle work?
Laser speckle is the random interference pattern produced when coherent light scatters from a medium that can be imaged onto a detector such as a camera. Motion from scattering particles, such as red blood cells in the vasculature, leads to spatial and temporal variations in the speckle pattern.
