Installation for selecting objects moving on a transfer line which is constituted by a continuous belt between an inlet for objects and an outlet for objects which are accepted with non-compliant objects (N'i) being rejected in the discharge zone comprising: - an ejection device with pivoting arms, the trajectory of which overlaps the trajectory of the objects, which installation is characterised in that - the ejection device is formed: - by two driven pivoting arms, the rotational trajectory of which overlaps the movement line of the objects (Ni) in the discharge zone, the two arms being diametrically opposed, each one being terminated by a curved abutment surface, - the rotation direction of the arm in the discharge zone corresponds to the movement direction of the objects (Ni) with a speed component in this direction at least equal to the movement speed and a transverse component for discharging the object, in order to accompany rapidly and carefully the object to be discharged without disturbing the object upstream by pushing the object to be discharged, nor the object downstream as a result of it being touched by the pivoting arm, - the driven arm receiving a control signal (SCN'i) of the object (N'i) to be ejected in order to impact this object which arrives in the discharge zone and to discharge it from the movement line. - an ejection device with pivoting arms, the trajectory of which overlaps the trajectory of the objects, - the ejection device is formed: - by two driven pivoting arms, the rotational trajectory of which overlaps the movement line of the objects (Ni) in the discharge zone, the two arms being diametrically opposed, each one being terminated by a curved abutment surface, - the rotation direction of the arm in the discharge zone corresponds to the movement direction of the objects (Ni) with a speed component in this direction at least equal to the movement speed and a transverse component for discharging the object, in order to accompany rapidly and carefully the object to be discharged without disturbing the object upstream by pushing the object to be discharged, nor the object downstream as a result of it being touched by the pivoting arm, - the driven arm receiving a control signal (SCN'i) of the object (N'i) to be ejected in order to impact this object which arrives in the discharge zone and to discharge it from the movement line. - by two driven pivoting arms, the rotational trajectory of which overlaps the movement line of the objects (Ni) in the discharge zone, the two arms being diametrically opposed, each one being terminated by a curved abutment surface, - the rotation direction of the arm in the discharge zone corresponds to the movement direction of the objects (Ni) with a speed component in this direction at least equal to the movement speed and a transverse component for discharging the object, in order to accompany rapidly and carefully the object to be discharged without disturbing the object upstream by pushing the object to be discharged, nor the object downstream as a result of it being touched by the pivoting arm, - the driven arm receiving a control signal (SCN'i) of the object (N'i) to be ejected in order to impact this object which arrives in the discharge zone and to discharge it from the movement line.