Points at infinity

Idea: look at images of homogeneous points H2=[1,0,0], H1=[0,1,0], H3=[[0,0,1]

In this case the matrix H is identity, and M = h.

What are points with last component zero?

“intersection” of horizontal sides (point at infinity

for direction [1,0]

“intersection” of vertical sides (point at infinity

for direction [0,1]

intersection of diagonals

[1,0,0]

[0,1,0]

[0,0,1]

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