  Neutron imaging is a non-destructive inspection technique with a wide range
of applications. One of the important aspects concerning neutron imaging is
achieving micrometer-scale spatial resolution. Developing a neutron detector
with a high resolution is a challenging task. Neutron detectors, based on
fine-grained nuclear emulsion, may be suitable for high resolution neutron
imaging applications. High track density is a necessary requirement to improve
the quality of neutron imaging. However, the available track analysis methods
are difficult to apply under high track density conditions. Simulated images
were used to determine the required track density for neutron imaging. It was
concluded that a track density of the order of $10^4$ tracks per 100 $\times$
100 $\mu$m$^2$ is sufficient to utilize neutron detectors for imaging
applications. The contrast resolution was also investigated for the image data
sets with various track densities and neutron transmission rates. Moreover,
experiments were performed for neutron imaging of the gadolinium-based gratings
with known geometries. The structure of gratings was successfully resolved. The
calculated 1$\sigma$ 10-90 \% edge response, using the gray scale optical
images of the grating slit with a periodic structure of 9 $\mu$m, was 0.945
$\pm$ 0.004 $\mu$m.
