FOCUS DETECTION DEVICE AND IMAGE-CAPTURING APPARATUS

• Main Author: OHNISHI Naoyuki
• Format: Patent
• Language: English
• Published: 27.04.2017
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

A focus detection device includes: a sensor outputting a pair of focus detection signal sequences, each of which being made of a plurality of focus detection signals; a difference calculation unit obtaining a plurality of differences by sequentially calculating differences between focus detection signals corresponding to each other in the pair of focus detection signal sequences; a division unit dividing the pair of focus detection signal sequences into at least two pairs of partial signal sequences based on the plurality of differences; a focus detection parameter calculation unit calculating a first focus detection parameter according to a phase difference amount of a first pair of partial signal sequences and a second focus detection parameter in accordance with a phase difference amount of a second pair of partial signal sequences; and a focus adjustment parameter determination unit determining either the first or second focus detection parameters, as a focus adjustment parameter.