A hybrid interpolation method with edge-preserving for passive millimeter wave images

摘要

This paper deals with edge-preserving interpolation for passive millimeter wave images with poor resolution and low SNR. A hybrid interpolation method basing on image decomposition via bilateral filtering is proposed. The low resolution and noisy image is first decomposed using the bilateral filter into the base and detail layers which represent large and small scale features, respectively. The base layer contains the large-scale structures and nearly frees with noise thus has the higher SNR, whereas the detail layer includes both small-scale details and noise and has the lower SNR. The detail layer is adaptively denoised by the joint bilateral filtering method and subsequently interpolated with edge preservation in the guidance of the base layer. The base layer is interpolated with edge-preserving method directly. Finally, the high resolution image is obtained by combining the base and detail layers. Experimental results show that the proposed method outperforms the conventional methods while preserving edges and suppressing jagging thus is suited for PMMW images interpolation to enhance resolution.