Abstract: In the DR luggage image, based on the difference of gray between typical objects and interesting objects, and on the difference of gray deviation between typical regions and interesting regions, an automatically discerning algorithm flow of interesting regions in the DR luggage image was researched and constructed. This flow concerns in the two-valuation of DR image, filtering of noise interference, dilation operation and erosion operation of image morphology, extraction of borders of interesting regions, and demarcation of interesting regions. Processed with the automatically discerning algorithm flow, interesting objects in the DR image can be showed and demarcated clearly. There is also a little of difference between the border demarcated of interesting objects and the border of practical objects, which is the one point still required to be improved and ameliorated in this algorithm flow.