Method for image processing using local statistics convolution

摘要

A method for filtering a digital image, comprising segmenting the digital image into a plurality of tiles; computing tile histograms corresponding to each of the plurality of tiles; deriving a plurality of tile transfer functions from the tile histograms preferably using 1D convolutions; interpolating a tile transfer function from the plurality of tile transfer functions; and filtering the digital image with the interpolated tile transfer function. Many filters otherwise difficult to conceive or to implement are possible with this method, including an edge-preserving smoothing filter, HDR tone mapping, edge invariant gradient or entropy detection, image upsampling, and mapping coarse data to fine data.

主权项

1. A method for filtering a digital image, the method comprising:
calculating a regional histogram corresponding to one or more regions in a first plurality of regions, each of the first plurality of regions comprising a plurality of pixels of the digital image; calculating for each region in the first plurality of regions a regional transfer function comprising a convolution of the corresponding regional histogram with a first convolution kernel; and filtering the digital image with an image transfer function based on at least one of the regional transfer functions.