Method of regulating a harmonization compensation between video sensor and head up display device, and corresponding devices

A method for adjustment of a compensation, known as harmonization compensation, applied to alleviate a discrepancy of conformity between, on the one hand, a video image transmitted by a video transducer (1) and projected onto a screen (9) by a head-up display device (5, 6), known as a HUD device, of an aircraft, and on the other hand, an external scene ahead of the aircraft visible through the said screen and/or a symbology generated and projected onto this screen by the HUD device, the aircraft comprising equipment items provided with control elements accessible in the cockpit, each control element being capable of emitting control signals that are used, in a mode of operation known as nominal mode, to modify control parameters of the corresponding equipment item,

• characterized in that:
• at least one equipment item of the aircraft, known as a redirectable equipment item, is pre-programmed in such a way that it can function alternatively according to the nominal mode and according to another mode, known as maintenance mode, in which the control signals of at least one of its control elements, known as a redirected control element, are used to define the applied harmonization compensation,
• an operator activates (100) the maintenance mode and starts an adjustment operation,
• in the context of this adjustment operation, the operator observes, from the pilot's position, on the one hand the video image transmitted by the video transducer and projected onto the screen, and on the other hand the external scene through the screen and/or the symbology projected onto the screen, and modifies (105, 109) in real time the applied harmonization compensation by manipulating at least one redirected control element, until the video image is matched with the external scene and/or with the symbology,
• at the end of this adjustment operation, the operator performs a final validation action (113) that ends the adjustment operation and initiates recording (114), in memory means installed on board the aircraft, of one or more values representative of the harmonization compensation applied at the end of the adjustment operation.