M²Depth: Self-supervised Two-Frame Multi-camera Metric Depth Estimation

$$\mathbf{P}_{t \to t-1}=( \mathbf{T}^{0} )^{-1} \mathbf{P}_{t \to t-1}^{0} \mathbf{T}^{0}$$

MFF

STF

Depth Decoder

Adaptive Depth Sample

$$\mathbf{d}_{\operatorname* {m i n}} ( \mathbf{p} )=\mathbf{d}_{\operatorname* {i n i t}} ( \mathbf{p} ) \div( 1+\alpha)$$ $$\mathbf{d}_{\operatorname* {max}} ( \mathbf{p} )=\mathbf{d}_{\operatorname* {i n i t}} ( \mathbf{p} ) \times( 1+\alpha)$$