Imaging device and control method for same

Abstract

The disclosed imaging device (100) is provided with a displacement control unit (22) which displaces the focus position of the imaging device (100) on the side towards the subject to be imaged by changing the imaging surface distance, and a displacement pattern setting unit (21) which sets a displacement pattern in a frame period to be implemented by the displacement control unit (22). The displacement pattern setting unit (21) sets the displacement pattern of the focus position so that: during the acceleration period of the frame period, the displacement rate of the imaging surface distance increases from zero; during the constant velocity period, the imaging surface distance is displaced at a constant rate; and during the deceleration period, the displacement rate of the imaging surface distance decreases to zero. The acceleration period and the deceleration period are each at least 1 / 10 of the length of the frame period.

Description

technical field [0001] The present invention relates to an imaging device and a control method thereof, and particularly relates to an imaging device that changes a focus position during exposure. Background technique [0002] In general, the following three methods can be mainly shown as methods for realizing extended depth of field (hereinafter, referred to as EDOF). The first method is to insert an optical element called a phase plate into an optical system to make the blur in the depth direction uniform. Furthermore, in this method, image restoration processing is performed on the obtained image using a previously measured blur pattern or a blur pattern calculated by simulation. According to this method, an EDOF image is generated. This method is called Wavefront Coding (hereinafter referred to as WFC) (see Non-Patent Document 1). [0003] The second method is to measure the distance with high precision for each partial region of the image by devising the shape of the...

AI Technical Summary

Problems solved by technology

In the case of this method, since a plurality of images need to be taken, there are problems in that the time required for taking pictures is long and the memory consumption is large.

therefore, Image 6 The conventional shifting method shown also has the problem that the image quality of the object position restored at the farthest end and the closest end is degraded compared with the image quality restored at the center thereof.

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