Cameras as Linear Systems

From glass to algebra

Flatland, a one-dimensional world

The pinhole is the identity

Cameras that do not look like cameras

A flatland pinhole camera has imaging matrix $\mathbf{A} = \mathbf{I}_3$ and the world vector is $(3, 5, 7)$. What does the sensor read and why?

Which statement best captures why some cameras produce readings that do not look like images?

A flatland camera has imaging matrix $\mathbf{A} = \begin{bmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \end{bmatrix}$ and the world vector is $(3, 5, 7)$. Compute the sensor vector and write its second entry.