METHOD FOR UPDATING A NORTHERN ORIENTATION VALUE OR FOR IMPROVING THE INITIALIZATION OF SUCH VALUE IN AN APPARATUS COMPRISING AN IMAGE SENSOR

摘要

The invention relates to a method for updating and / or initializing, in a system comprising a horizon-oriented image sensor such as a twin coupled to a geographic North searcher integrating a gyrometer, a value representative of the orientation of the image sensor with respect to the North, in which the offset of two images from the digital image sensor at a first instant and at a second instant is determined to constitute information representative of an angular movement, and in which this angular movement information is exploited to: - update the orientation value of the image sensor; and / or for discriminating the movements of the image sensor with respect to the ground of the image sensor movements due to the rotation of the earth, in a process of initialization of the orientation value of the image sensor using a North researcher of gyroscopic or gyrometric type rigidly secured to the image sensor.