Air-Coupled Low Frequency Ultrasonic Transducers and Arrays with PMN-32%PT Piezoelectric Crystals.
Rymantas KazysReimondas SliterisJustina SestokePublished in: Sensors (2017)
Keyphrases
- low frequency
- high frequency
- frequency domain
- wavelet transform
- wavelet analysis
- wavelet coefficients
- discrete wavelet transform
- high voltage
- subband
- frequency band
- low pass
- electromagnetic fields
- high frequency components
- high resolution
- original images
- dct domain
- contourlet transform
- spatial domain
- filter bank
- image processing
- low and high frequency