Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Arnaud Tonda

Suzanne Lesecq

Mykhailo Zarudniev

A method for automatically focusing a camera comprising an image sensor, at least one lens configured to project an image onto the sensor and an actuator configured to modify a focusing parameter of the lens, comprises: a first phase of controlling the actuator in an open loop so the focusing parameter successively takes a plurality of predefined values, images being acquired for each value of the focusing parameter and a sharpness indicator being calculated on the basis of each image; and a second phase of controlling the actuator in a closed loop to maximize the sharpness indicator, the second closed-loop control phase being implemented by making use of a control law and starting conditions determined on the basis of the sharpness indicators calculated during the first phase. A system for automatically focusing a camera for implementing the method, and a camera equipped with such a system is provided.

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Grenoble, France

Arnaud Tonda