Fig. 4From: A novel approach to extracting useful information from noisy TFDs using 2D local entropy measuresResults for the first tested signal with SNR=3 dB, TFD of the noisy signal (a), obtained optimal entropy map from spectrogram (b), obtained optimal entropy map from RIDB (c), mask obtained from applying RICI threshold on spectrogram (d), mask obtained from applying RICI threshold on RIDB (e), and mask from applying fixed threshold of 5% on signal spectrogram (f)Back to article page