Focusing control device and controlling method of the same

An imaging device comprising:

• a focusing lens;
• a scan control unit configured to perform a scan operation to sequentially acquire a focus evaluation value from an image signal by moving a focusing lens;
• a focus determination unit configured to determine whether an in-focus position of the focusing lens can be obtained based on the focus evaluation value;
• a prediction unit configured to predict an in-focus position for a current exposure operation based on an in-focus position for a previous exposure operation, the prediction of an in-focus position being performed when continuous main exposure operation is performed for shooting an image;
• and
• a prediction determination unit configured to determine whether prediction of the in-focus position is possible,
• wherein, when the prediction determination unit determines prediction of in-focus position for the current exposure operation is not possible, the scan control unit performs the scan operation to obtain an in-focus position based on an in-focus position of the previous exposure operation at which obtaining of an in-focus position was determined to be possible by the focus determination unit.

A controlling method of focusing control device comprising:

• performing a scan operation to sequentially acquire a focus evaluation value from an image signal by moving a focusing lens;
• determining whether an in-focus position of the focusing lens can be obtained based on the focus evaluation value;
• predicting an in-focus position for a current exposure operation based on an in-focus position for a previous exposure operation, the predicting of an in-focus position being performed when continuous main exposure operation is performed for shooting;
• and
• determining whether prediction of the in-focus position is possible,
• wherein, when prediction of the in-focus position for the current exposure operation is determined to be not possible, the scan operation is performed to obtain an in-focus position based on an in-focus position of the previous exposure operation at which obtaining of an in-focus position of the focusing lens was determined to be possible.