Calixte Denizet 2f828c7bf4 [Editor] (WIP) Add a new tool in order to add an handwritten signature to a pdf (bug 1942343) ...

This patch is adding some code in order to extract a drawing as curves from an image.
The algorithm is basically the following:
 - reduce the dimensions
 - make it gray
 - apply a bilateral filter in order to add some blurryness while keeping the edges
 - compute the histogram
 - guess what's the background color which should contain a large majority of the pixels
 - make a binary image
 - extract the contours in using the Suzuki algorithm
 - apply the Douglas-Peucker algorithm in order to reduce the number of points

The algorithm is improvable but it should work pretty well if there's a clear difference between
the background and the drawing.
In a v2 we could use a ML model in order to improve the extraction.

There's few changes related to the UI in order to make the tool usable, but they're very basic
for the moment.

2025-01-29 21:52:14 +01:00

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