Abstract
Full-disc solar images obtained with the Extreme Ultraviolet Imaging Telescope (EIT) on board the Solar and Heliospheric Observatory (SOHO) were used to analyse solar dierential rotation determined by tracing coronal bright points. Two dierent procedures were developed and compared: an interactive and an automatic method. The interactive method is based on the visual tracing of coronal bright points in consecutive images using computer programs written in the Interactive Data Language (IDL). The automatic method relies on the IDL procedure \Regions Of Interest (ROI) segmentation which is used to detect and follow bright points in triplets of consecutive images. The test-results obtained applying both methods by dierent persons who performed tracing are presented and compared. The advantages and disadvantages of the two methods are discussed.
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