Abstract: In order to eliminate speckle noise in digital holographic reconstructed image, a denoising method based on edge detection anisotropic diffusion equation (PM) is proposed. The diffusion process is guided by the edge detection operator instead of the gradient operator. The edge detection operator is less sensitive to noise, and can better recognize the edge information of reconstructed image. Compared to median filtering, mean filtering, wavelet transform filtering algorithm of peak signal-to-noise ratio (PNSR), the experiments show that the proposed algorithm has better denoising effect, and can effectively protect the details of the image in the process of denoising.

Key words: digital holography, speckle denoising, anisotropic diffusion, edge detection