  A wide-field magnetometer utilizing nitrogen-vacancy (NV) centers in diamond
that does not require microwaves is demonstrated. It is designed for
applications where microwaves need to be avoided, such as magnetic imaging of
biological or conductive samples. The system exploits a magnetically sensitive
feature of NV centers near the ground state level anticrossing (GSLAC). An
applied test field from a wire was mapped over an imaging area of $\approx 500
\times 470\,{\mu}\text{m}^2$. Analysis of the GSLAC lineshape allows to extract
vector information of the applied field. The device allows micrometer-scale
magnetic imaging at a spatial resolution dominated by the thickness of the NV
layer (here $50\,{\mu}\text{m}$). For a pixel size of $4\,{\mu}\text{m} \times
3.8\,{\mu}\text{m}$ the estimated sensitivity is
$4.8\,{\mu}\text{T}/\sqrt{\text{Hz}}$. Two modalities for visualizing the
magnetic fields, static and temporal, are presented along with a discussion of
technical limitations and future extensions of the method.
