I'm working with modeling objects with 7 meters high. My Pictures were taken with a smartphone to a horizontal distance (x, z) of the object at a single height (y). I then divide this object into 3 parts (A,B, C) and calculated the volume of these solids. The solids that are in the same photographic level (A) have good accuracy ... but accuracy drops with the increase of distance of parts. A>B>C.

O C -

B -

J B -

E -

C A - >

T -

Is there any way to correct this error for the 3D model?