In the foreground of a side-view picture of a table, the
legs touch the floor at a point that is 12...

Question

In the foreground of a side-view picture of a table, the
legs touch the floor at a point that is 12 mm from the bottom of the picture,
and the tabletop is 65 mm from the bottom of the picture. One end of the
tabletop is 14 mm from the left edge of the picture, and the other end is 99 mm
from the left edge. Estimate the actual length of the tabletop.

Baljit · Accepted Answer

Legs of table is 12mm from bottom
Tabletop is 65mm from bottom
One end of table top is  14mm from left edge
Other end of table top is 99mm from left edge
Height of table in image=65-12mm=53mm
length of table top in image=99-14mm=85mm
Aspect ratio=85/53
Length of tabletop=(85/53)*height of the table
To calculate proper length we need focal length of the camera and distance between camera and object.
But from above data we cannot calculate exact length.

In the foreground of a side-view picture of a table, the legs touch the floor at a point that is 12 mm from the bottom of the picture, and the tabletop is 65 mm from the bottom of the picture. One end...

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