Patent ID: 8537214
Filing Date: 2013-09-17
Classification: G02B

Abstract:
1. A method for adjustment of a compensation, known as harmonization compensation, applied to alleviate a discrepancy of conformity between a video image transmitted by a video transducer and projected onto a screen by a head-up display device, known as a HUD device, of an aircraft, and an external scene ahead of the aircraft visible through the screen and/or a symbology generated and projected onto the screen by the HUD device, the aircraft comprising equipment items provided with control elements accessible in a 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 a corresponding equipment item, the method comprising: pre-programming at least one equipment item of the aircraft, known as a redirectable equipment item, in such a way that the at least one equipment item 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 control element, known as a redirected control element, are used to define applied harmonization compensation, the pre-programming only authorizing activation of the maintenance mode when the engines of the aircraft are off; activating the maintenance mode and starting an adjustment operation; receiving adjustment commands from at least one redirected control element manipulated by a user observing from a pilot's position, the video image transmitted by the video transducer and projected onto the screen, and the external scene through the screen and/or the symbology projected onto the screen during the adjustment operation until the video image is matched with the external scene and/or with the symbology; modifying in real time the applied harmonization compensation based on the adjustment commands; and performing a final validation action that ends the adjustment operation and recording in a memory installed on board the aircraft, one or more values representative of the harmonization compensation applied at an end of the adjustment operation.