Continuous fiber reinforced thermoplastics experience increasing demand by industry. Compared to their thermoset counterpart, they allow for shorter production cycles and promise more and better joining and recycling solutions. Usually, continuous fiber reinforced semi-finished parts are produced and then prepared for a back injection molding process to add functional integration. The electrical resistance or joule heating process utilizes the electrical conductivity and accompanying heat dissipation of embedded carbon fibers for the heating of the semi-finished parts. Thus, a short and homogenous heating process can be achieved. The main challenge that arises with resistance heating is the optimization of the electrical contacting of the part. In this study, the heating process of several variations of contact pieces is monitored using thermal imaging. An algorithm is developed to automatically analyze key aspects of the heating process allowing for easy comparison of different parameter sets. Key results show that rounded edges for copper contact pieces and high contact areas yield homogenous temperature distributions and prevent hot spots. Since generally smaller contact areas are desired in order to maximize the heated area and minimize potential defects, an optimum needs to be found for every part.