Filter

‘audio.utils.filter’ module within the ketos library

This module provides utilities for manipulating and filtering waveforms and spectrograms.

apply_median_filter(img[, row_factor, ...])	Discard pixels that are lower than the median threshold.
apply_preemphasis(sig[, coeff])	Apply pre-emphasis to signal
blur_image(img[, size, sigma, gaussian])	Smooth the input image using a median or Gaussian blur filter.
enhance_signal(img[, enhancement])	Enhance the contrast between regions of high and low intensity, while preserving the range of pixel values.
filter_isolated_spots(img[, struct])	Remove isolated spots from the image.
plot_image(img, fig, ax[, extent, xlabel, ...])	Draw the image.
reduce_tonal_noise(img[, method])	Reduce continuous tonal noise produced by e.g. ships and slowly varying background noise.
reduce_tonal_noise_running_mean(img, ...)	Reduce continuous tonal noise produced by e.g. ships and slowly varying background noise by subtracting from each row a running mean, computed according to the formula given in Baumgartner & Mussoline, Journal of the Acoustical Society of America 129, 2889 (2011); doi: 10.1121/1.3562166.