A method and a system for detecting the ingestion of an object by an aircraft turbine engine during a mission is disclosed. The method includes: acquiring during the mission digital images of the operating fan of the turbine engine, these images being acquired at an acquisition frequency proportional to the speed of rotation of the fan and to the number of blades of the fan; identifying the different phases of the mission of the aircraft for each phase of the mission; comparing the images of the fan with at least one reference image corresponding to sound operation of the fan; and, if necessary, identifying each abnormal image of the fan which differs from the corresponding reference image, the identification of an abnormal image of the fan corresponding to the crossing of an alert level for detecting the ingestion of an object by the turbine engine.