The observations imply that the raised material is more crystalline than the surrounding background.
This activity can be induced by random fluctuations in the surrounding background input.
The system can distinguish between hand claps and most surrounding background noise such as normal talking.
Hence, it is desirable for a fluorescent nanoparticle to exhibit bright emission, above that of any surrounding background fluorescence, with minimal optical excitation.
For pointlike objects the surrounding background is close to the true background, so the "local" mode works much better than it does for extended sources.
This tool replaces pixel values in a source region or stack of source regions in an input image with values interpolated from surrounding background regions.
The video/infrared images captured at long range usually have low brightness and low contrast objects of interest with respect to surrounding background clutter.
A 'logarithmic instrumental visibility', Vi, is defined by Vi=log∫ΔG2.5dA where ΔG is the difference in grey level between the scratched region and the surrounding background, and A is the area of the scratch.
We also did not use contextual information on the surrounding background EEG.
Only focal uptake visually detected, above the surrounding background, was considered as abnormal.
Motion blurring and system spatial resolution spread the surrounding background activity inside the defect area.
