Method and apparatus for filtering an image using a guidance image
AssigneeThomson Licensing
InventorsJobst Hoerentrup, Markus Schlosser
Life of this patent
Estimating the term…
Abstract
A method and an apparatus for filtering an image using a guided image filter are described. A filter computes a filtering output using a guidance image. For calculating the filtering output confidence values associated to a filter input are taken into account. A confidence-weighted averaging is performed using the confidence values.
Claims18
A method for filtering an image using a guided image filter, comprising:
- retrieving the image to be filtered, a guidance image, and confidence values associated with the image to be filtered;
- computing a filtering output from filter input values derived from the image to be filtered and confidence values associated with the filter input values using a linear transformation of the guidance image in a window, wherein coefficients for the linear transformation are computed from confidence-weighted average values obtained for the window;
- and
- outputting the computed filtering output.
An apparatus configured to filter an image using a guided image filter, the apparatus comprising;
- an input configured to retrieve the image to be filtered, a guidance image, and confidence values associated with the image to be filtered;
- a filter configured to compute a filtering output from filter input values derived from the image to be filtered and confidence values associated with the filter input values using a linear transformation of the guidance image in a window, wherein coefficients for the linear transformation are computed from confidence-weighted average values obtained for the window;
- and
- an output for the computed filtering output.
A non-transitory computer readable storage medium having stored therein instructions enabling filtering of an image using a guided image filter which, when executed by a computer, cause the computer to;
- retrieve the image to be filtered, a guidance image, and confidence values associated with the image to be filtered;
- compute a filtering output from filter input values derived from the image to be filtered and confidence values associated with the filter input values using a linear transformation of the guidance image in a window, wherein coefficients for the linear transformation are computed from confidence weighted average values obtained for the window;
- and
- output the computed filtering output.
Dependencies are inferred from the claim text.