A simple selfie-to-Desmos graph converter that runs locally, a process I personally call "Desmosify"
To convert an image into usable data for plotting on Desmos, we use a Python library called Potrace: it takes PNG data as a bitmap and returns a traced path of all the Bézier curves. Once we have our four points, we simply plug them into the equation and write it as a LaTeX expression, which is what the Desmos API uses to draw graphs.
However, another issue arises due to the edge detection algorithm used by Potrace, the input image must strictly consist of two colors, such as black and white. This necessitates a preprocessing step to convert the image into a black-and-white format
Thus, there are two main steps: image processing and converting the image into a Desmos graph. They will be elaborated below
First, there is an optional step: taking a photo. If you already have an image, simply rename it and place it in the samples folder. Otherwise, the code will run, open the computer's camera, and take a photo for you. Once the selfie is captured, the image will go through a processing stage using edge detection methods
From the image below, there are three contrast enhancement techniques and three edge detection algorithms. Starting from the original image, you can freely choose one or multiple methods, click the Apply Filters button and achieve the result you find most satisfactory
A more detailed analysis of the contrast enhancement techniques and the three edge detection algorithms can be found here
Once you have a suitable black-and-white image, proceed by clicking the Begin Rendering button
Initially, there will be a line showing the number of Bézier curves and some notes (if the number is too large, consider changing the image or reducing the quantity as it may cause the device to crash). Start by clicking the Start Rendering button and wait (the rendering time will be proportional to the number of Bézier curves)
Once completed, you can click the "Capture Screenshot" button, and an image will appear below. Clicking on it will automatically download it to your device
The original idea of this step belongs to Junferno, I then developed and modified it to suit my personal preferences. Read more about his work at DesmosBezierRenderer
By using Desmosify Selfie Pic, you agree to comply to the Desmos Terms of Service. The Software and related documentation are provided “AS IS” and without any warranty of any kind. Desmosify Selfie Pic is not responsible for any User application or modification that constitutes a breach in terms. User acknowledges and agrees that the use of the Software is at the User's sole risk. The developer kindly asks Users to not use Desmosify Selfie Pic to enter into Desmos Math Art competitions, for the purpose of maintaining fairness and integrity