Minimum sampling rate and minimum sampling curve for image-based rendering

摘要

A minimum sampling rate and a minimum sampling curve for continuous representation of a scene are disclosed. The minimum sampling rate for light-field rendering is determined in accordance with $\mathop{\mathrm{image}}$ \mathrm{\Δ}\⁢\text{\ }\⁢t_{\max }=\frac{1}{2\⁢K_{{\mathrm{\Ω}}_v}\⁢\text{\ }\⁢{\mathrm{fh}}_d},$$;where K_&OHgr;v accounts for a light-field signal cut-off frequency, a sampling camera resolution and an output resolution, ƒ specifies a sampling camera focal length, and h_d specifies a light-field depth range. The minimum sampling curve for image-based rendering is determined as constrained by N_d=2K_&OHgr;vƒh_d&Dgr;t, N_d≧1, where N_d is the number of depth layers, &Dgr;t specifies a sampling interval along a t direction. Where IBR is be performed under uncertain depth, the curve is determined as $\mathop{\mathrm{image}}$ \mathrm{\Δ}\⁢\text{\ }\⁢t_{\max }=\underset{z_e}{\min }\⁢\text{\ }\⁢\frac{\left(z_e+\mathrm{\Δ}\⁢\text{\ }\⁢\mathrm{\η}\right)\⁢\text{\ }\⁢\left(z_e-\mathrm{\Δ}\⁢\text{\ }\⁢\mathrm{\η}\right)}{4\⁢\text{\ }\⁢{\mathrm{fK}}_{{\mathrm{\Ω}}_v}\⁢\text{\ }\⁢\mathrm{\Δ}\⁢\text{\ }\⁢\mathrm{\η}},$$;where &Dgr;t_max specifies a maximum sampling interval along a t direction, z_e specifies an estimated depth, and &Dgr;&eegr; specifies a depth error.