Documentation on Approach

[cancan101]

Is there any documentation or paper that explains the method used here?

Is it the same approach as is outlined in https://dl.acm.org/doi/10.1145/2638728.2641695?:

1. Eye image converted to grayscale, user region of interest (white stroke rectangle), and initial estimation of pupil region (white square and dashed line square.)
2. Canny edge detection (green lines.)
3. Define “dark” region as offset from lowest spike in histogram within eye image.
4. Filter edges to exclude spectral reflections (yellow.) and not inside “dark” areas (blue)
5. Remaining edges extracted into contours using connected components and split into sub-contours based on curvature continuity criteria (multi colored lines).
6. Candidate pupil ellipses (blue) are formed using ellipse fitting
7. Final ellipse fit found through an augmented combinatorial search ( finally ellipse with center in red) - supporting edge pixels drawn in white.