Add HorizontalInterpolate task

which linearly interpolates rows of an image based on a specified mask.

1 files changed, 17 insertions, 0 deletions

diff --git a/docs/filters.rst b/docs/filters.rst
index d962b31..bd7044d 100644
--- a/docs/filters.rst
+++ b/docs/filters.rst
@@ -543,6 +543,23 @@ Non-local-means denoising
         Sigma influencing the Gaussian weighting.
 
 
+Horizontal interpolation
+------------------------
+
+.. gobj:class:: horizontal-interpolate
+
+    Interpolate masked values in rows of an image. For all pixels equal to one
+    in the mask, find the closest pixel where mask is zero to the left and right
+    and linearly interpolate the value in the current pixel based on the found
+    left and right values. If the mask goes to the left or right border of the
+    image and on the other side there are at least two non-masked pixels
+    :math:`x_1` and :math:`x_2`, compute the value in the current pixel
+    :math:`x` by (in case the mask goes to the right border, left is analogous)
+    :math:`f(x) = f(x_2) + (x - x_2) * (f(x_2) - f(x_1))`. In case there is only
+    one valid pixel on one of the borders and all the others are masked, use
+    that pixel's value in all the remaining ones.
+
+
 Stream transformations
 ======================