Despeckle Filtering for Multiscale Amplitude-Modulation Frequency-Modulation (AM-FM) Texture Analysis of Ultrasound Images of the Intima-Media Complex
Figure 3
AM-FM analysis of the IMC original (1st column) and despeckled images with the DsFhybrimedian (2nd column) and DsFkuhawara (3rd column), from a male asymptomatic subject aged 49. In the 1st row, the IMT measurements of the original (IMTaver = 0.66 mm, = 0.827 mm, = 0.526 mm, IMTmedian = 0.68), DsFhybrimedian (IMTaver = 0.69 mm, = 0.91 mm, = 0.53 mm, IMTmedian = 0.69), and DsFkuhawara (IMTaver = 0.63 mm, = 0.77 mm, = 0.49 mm, IMTmedian = 0.63 mm) are shown. In the following rows we present the AM-FM components of the instantaneous amplitude of Log of LIA, MIA, and HIA, and of instantaneous frequency of LIF, MIF, and HIF. The last row shows the FM demodulation (integral of the IF) of the images in the low frequencies. For better visualization, the images have been interpolated to be 300 × 20 pixels.
