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To complete the pre-processing, the parts of the iris texture which are occluded by eyelids, eyelashes, or reflections are detected and stored in an according noise mask.
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Also, the DWT scheme is not very practical since the weights need to be optimized differently in various noise conditions according to noise types and signal-to-noise ratio levels.
Noise characteristics are presented according to noise sources and conditions.
Certainly, aircraft have got quieter since then; but, according to noise campaigners, the increase in the number of planes more than makes up for the fall in the noise level from each one (see chart).As the campaign against noise escalates, the story of Terminal 5 is rolling slowly to a close.
"This could involve grading works according to noise, causing headaches for program schedulers".
Alongside deep cuts in spending on defense and social programs, the package also included plans to levy a departure tax on airline tickets, which was expected to vary according to noise levels and fuel consumption.
It also means that the parameters used in each method should be chosen according to noise level.
According to noise level and image content, the stop criterion and the multiplicative constant of the threshold value in the de-noising step should be adaptive as well.
Most of the state-of-the-art algorithms set that parameter to some fixed value which gives satisfactory results in most cases [14, 21, 25] or set it according to noise concentration [20, 23].
Basically, the energy of the received signal is compared with a threshold value which is calculated according to noise variance and desired false alarm probability in detecting spectral holes.
The thresholds Th 01 and Th3 change their values autonomously for different intercepted signals with different SNRs while Th 02 and Th2 are optional empirical thresholds which can improve classification performance according to noise level.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com