Wendelstein 7-X (W7-X) is the most advanced fusion experiment in the stellarator line and is aimed
at proving that the stellarator concept is suitable for a fusion reactor. One of the most important issues
for fusion reactors is the monitoring of plasma facing components when exposed to very high heat
loads, through the use of visible and infrared (IR) cameras. In this paper, a new image processing
system for the analysis of the strike lines on the inboard limiters from the first W7-X experimental
campaign is presented. This system builds a model of the IR cameras through the use of spatial
calibration techniques, helping to characterize the strike lines by using the information given by real
spatial coordinates of each pixel. The characterization of the strike lines is made in terms of position,
size, and shape, after projecting the camera image in a 2D grid which tries to preserve the curvilinear
surface distances between points. The description of the strike-line shape is made by means of the
Fourier Descriptors.