The traditional technique of drawing single line images required use of machine hardware or experiences artists. We present a software-based solution to this prob- lem by making use of concepts like Voronoi Diagrams, B ́ezier curves, stippling. An iterative technique acts on input images directly to produce high-quality single line drawings after stippling the input.
Our project: Single Line Image Drawing employs simple concepts such as Voronoi Diagrams and Stippling to generate single line image drawings of given input.
The workflow of the project is as follows and can be found in various different files of the project:
- Stippling
- Used implementations as discussed in the paper Weighted Voronoi Stippling by Adrian Secord.
- Used multi-source BFS to generate voronoi diagrams.
- Single Line Drawing by Straight Lines -Iterated over all points and connected them to a randomly chosen point in the top 5 nearest point and simply use inbuilt OpenGL library function or simply add numerous points in between those two points using a straight line equation
- Single Line Drawing by Bezier Curves
- Iterated over points in batches of 4 and connected them using Bezier curves. This gives a better feeling of a smooth hand drawing as compared to connecting using straight lines.
Install the dependencies.
$ pip install numpy
$ pip install Pillow$ cd stippling
$ python3 stippling.py
Correct file input path & number of stipples desired is given as input.The stippling program generates a pickle file generating_points containing the centroids of the voronoi diagram of the final output. We store its path and use it in the next section.
$ cd generate_single_hand_drawing
$ python3 curve.py generating_pointsThis program upon execution generates the required output files.
Below are the results we got upon execution of our program: For Stippling:
For Single Line Drawing:
