# Apply hard thresholding to detail coefficients def threshold_coeffs(coeff_list, thr): return [pywt.threshold(c, thr, mode='hard') for c in coeff_list]
# Display fig, axes = plt.subplots(1, 3, figsize=(12, 4)) axes[0].imshow(original, cmap='gray') axes[0].set_title('Original') axes[1].imshow(noisy, cmap='gray') axes[1].set_title('Noisy') axes[2].imshow(denoised, cmap='gray') axes[2].set_title('Max Denoised') for ax in axes: ax.axis('off') plt.tight_layout() plt.show()
# 2. Wavelet hard thresholding (removes residual high-frequency noise) coeffs = pywt.wavedec2(denoised, wavelet, level=4) if denoised.ndim == 2 else \ pywt.wavedec(denoised, wavelet, level=4) max denoise
# 3. Strong Bilateral filter (smooths while keeping edges) denoised = denoise_bilateral(denoised, sigma_color=0.3, sigma_spatial=5, multichannel=(image.ndim==3))
# Compute universal threshold threshold = sigma * np.sqrt(2 * np.log(denoised.size)) # Apply hard thresholding to detail coefficients def
import numpy as np import cv2 import pywt from skimage.restoration import denoise_nl_means, denoise_bilateral from skimage.util import random_noise def max_denoise(image, sigma=0.1, h=1.15, wavelet='db8'): """ Apply maximum-strength denoising using a cascade of methods.
# 1. Strong Non-Local Means (preserves edges while smoothing flat regions) denoised = denoise_nl_means(image, h=h, sigma=sigma, fast_mode=True, patch_size=7, patch_distance=11, multichannel=(image.ndim==3)) thr): return [pywt.threshold(c
# Apply maximal denoising denoised = max_denoise(noisy, sigma=0.2, h=1.5)