| http://www.w3.org/ns/prov#value | - The inverse focal length is unknown if gi and hi are both zero, i.e. if the pitch and roll are both zero. [0757] 8.4.3.8 Solving for Z Offset [0758] Once the inverse focal length (J) is known, the z offset (1) is obtained from EQ 80, according to EQ 129. [0759] Again, the z offset (1) is unknown if the inverse focal length (J) is unknown, i.e. if the pitch and roll are both zero. [0760] 8.4.3.9 De
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