Abstract: An automatic focusing device, in which a focus lens is driven by tracking an object-in-motion to obtain an in-focus state, based upon a focus prediction that is executed from repeated distance measurements. In-focus indicating is executed only when the focus lens is in the in-focus condition and the object-in-motion is moving at a speed that is less than a predetermined speed.

Abstract: A signal processor for an AF video signal in an electronically controlled camera, including: a photosensor of the self-scanning type having an electric charge accumulating part for accumulating electric charge therein which corresponds to object brightness, an exposure monitor for accumulating electric charge therein which corresponds to the amount of signal electric charge accumulated in the electric charge accumulating part, and a dark charge monitor for accumulating dark charge therein.

Abstract: A signal processor for an AF video signal in an electronically controlled camera, comprising: a photosensor (20) of the self-scanning type having an electric charge accumulating part (PD) for accumulating signal electric charge therein which corresponds to the object brightness, an exposure monitor (M1', M2', M3') for accumulating electric charge therein which corresponds to the amount of the signal electric charge accumulated in said electric charge accumulating part, and a dark charge monitor (DM1') for accumulating dark charge therein, said photosensor being adapted to sequentially transmit the signal electric charge accumulated in said electric charge accumulating part for transfer to an A/D converter (34); and an automatic gain control circuit (37) for amplifying, thereby automatically gain-controlling, the AF video signal produced from said photosensor when said object contrast is low, in such a manner that a low-contrast corresponding level difference, which is the difference between a high-luminance c