Guided Image Filtering

Abstract

In this paper we propose a novel explicit image filter called guided filter. Derived from a local linear model, the guided filter computes the filtering output by considering the content of a guidance image, which can be the input image itself or another different image. The guided filter can be used as an edge-preserving smoothing operator like the popular bilateral filter, but has better behaviors near edges. The guided filter is also a more generic concept beyond smoothing: it can transfer the structures of the guidance image to the filtering output, enabling new filtering applications like dehazing and guided feathering. Moreover, the guided filter naturally has a fast and non-approximate linear time algorithm, regardless of the kernel size and the intensity range. Currently it is one of the fastest edge-preserving filters. Experiments show that the guided filter is both effective and efficient in a great variety of computer vision and computer graphics applications including edge-aware smoothing, detail enhancement, HDR compression, image matting/feathering, dehazing, joint upsampling, etc.

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A personal comment: Try the guided filter in any situation when the bilateral filter works well. The guided filter is much faster and sometimes (though not always) works even better.

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Related Publications:

Other materials:

See also:

  • "Fast Cost-Volume Filtering for Visual Correspondence and Beyond", in CVPR 2011
    link   - a real-time stereo method utilizing the guided filter.

  • "Linear stereo matching", in ICCV 2011
    link   - another linear time stereo method enabled by the guided filter.

  • "Adaptive Manifolds for Real-Time High-Dimensional Filtering", in SIGGRAPH 2012
    link   - a latest fast bilateral filtering method, with comprehensive comparisons with the guided filter and other filters.

  • "Guided Image Filtering for Interactive High-quality Global Illumination", in EGSR 2011
    link   - ray tracing using guided filters.

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