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- W4328130266 abstract "<p>Concerning the Perspective 3-Point (P3P) Problem, Grunert's system of three quadratic equations has a repeated solution if and only if the cubic polynomial introduced by Finsterwalder has a repeated root. This polynomial is here shown to be obtainable from a particularly simple cubic polynomial with complex coefficients via a simple Möbius transformation. This provides surprising geometric insight into the P3P problem. In particular, (1) the discriminant of Finsterwalder's polynomial can be written using the formula for the standard deltoid curve, and (2) this discriminant vanishes on a surface that approaches a deltoid shape when the camera is moved infinitely far from the control points in a direction perpendicular to the control points plane (the limit case). These two facts have been previously reported, but obscure reasoning was required to establish them. In contrast, the present article uses the newly discovered cubic polynomial to easily produce the first fact, which then provides a basis for better understanding the second fact. A detailed geometric description of the P3P solution points in the limit case is also provided.</p>" @default.
- W4328130266 created "2023-03-22" @default.
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- W4328130266 date "2023-03-21" @default.
- W4328130266 modified "2023-09-27" @default.
- W4328130266 title "Understanding the Deltoid Phenomenon in the Perspective 3-Point Problem" @default.
- W4328130266 doi "https://doi.org/10.36227/techrxiv.21781268.v2" @default.
- W4328130266 hasPublicationYear "2023" @default.
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