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1. A wind turbine blade measurement system for optically determining a torsion of a wind turbine blade, wherein the wind turbine blade measurement system comprises: a wind turbine blade, which is configured to be mounted to a hub of a wind turbine, the wind turbine blade comprising: a root section, which when mounted to the hub, is located nearest the hub, and a plurality of sets of markers provided on an exterior surface of the wind turbine blade at different spanwise positions on the wind turbine blade along a spanwise direction of the wind turbine blade, each set of markers comprising a plurality of individual marker points, a first camera, which is mounted in a fixed position on a support structure on an exterior surface of the root section of the wind turbine blade, and arranged so as to measure along the spanwise direction of the wind turbine blade, and an auxiliary camera, which is arranged at a position outside of the wind turbine blade, the auxiliary camera being arranged so as to being able to carry out measurements of the plurality of sets of markers and an orientation of at least one of the support structure and the first camera; wherein the support structure is provided with auxiliary reference markers, and wherein the auxiliary camera is arranged to measure the auxiliary reference markers so as to determine the position and/or alignment of at least the first camera.
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