JP2013145315A5 - - Google Patents

Description

In order to achieve the above object, an imaging apparatus according to the present invention limits an image sensor having a plurality of pixels and a light beam incident on each of the plurality of pixels to a light beam that passes through a specific pupil region of the imaging optical system. By rearranging the pupil division means and the values of the plurality of pixels according to the position of the virtual imaging surface and the angle at which the light beam enters the pixel, and adding the values of the pixels on which the light beam that has passed through different pupil regions is incident Image generating means for reconstructing an image from the obtained pixels, and acquisition means for obtaining an evaluation value for searching for a focus position from the reconstructed image, and a plurality of virtual imaging surfaces by the image generating means the first sampling interval a plurality of images corresponding to the position of the reconstructed, IMAGING dEVICE you search for the focus position with criticism value that is obtained by the acquisition means from a plurality of reconstructed images After searching for the in-focus position with Based on search, and performs a search of the focus position in the narrow second sampling interval than the first sampling interval.

Next, the usefulness of the coarse / fine adjustment operation will be described with reference to FIGS. 5 and 6. FIG. 5 shows the focus lens position on the horizontal axis and the AF evaluation value on the vertical axis. The higher the AF evaluation value on the vertical axis, the closer the focus lens is to the in-focus position. (After exploring a rough peak in the first sampling interval by the rough adjustment, the fine-tuning a narrow second sampling interval than the first sampling interval near the peak) crude fine adjustment as shown in Fig. 5 when performing the operation of In other words, the pixel thinning rate is increased during coarse adjustment than fine adjustment. Further, the focus lens position interval for obtaining the AF evaluation value is desirably 10 to 25 FΔ (F: F number, Δ: about 20 μm) at the time of coarse adjustment, and about 1 to 5 FΔ at the time of fine adjustment. By doing so, high-speed and accurate contrast AF can be performed. If this is made to correspond to the AF processing performed by changing the position of the reconstruction surface of the present embodiment, the position of the focus lens on the horizontal axis in FIG. 5 corresponds to the position of the reconstruction surface.

Claims (5)

An imaging device having a plurality of pixels;
Pupil dividing means for limiting a light beam incident on each of the plurality of pixels to a light beam passing through a specific pupil region of the photographing optical system;
The value of said plurality of pixels, e exchange sequence according to the angle of the light beam on the position and the pixel of the imaging surface of the virtual enters, pixels obtained by light beams passing through different pupil regions adds the value of the pixel to be incident Image generating means for reconstructing an image from
Obtaining means for searching for an in-focus position from the reconstructed image,
Reconstructs a plurality of images corresponding to the position of the imaging surface of the plurality of virtual by pre Symbol image generating means, a focus position by using the evaluation value obtained by the plurality of reconstructed the acquisition means from the image a to that imaging device search,
The imaging device searches for a focus position at a second sampling interval narrower than the first sampling interval based on the search after searching for a focus position at a first sampling interval. An imaging device . It said image generation means, image pickup apparatus according to claim 1, wherein the light beams passing through different pupil regions for reconstructing an image from the pixels obtained by adding the value of the field element you incidence.   3. The image generating means reconstructs an image from pixels obtained by adding the values of pixels on which light beams that have passed through pupil-divided pupil regions are incident. Imaging device. The image generation means has the number of pixels of the image used for searching the focus position at the first sampling interval, rather than the number of pixels of the image used for searching the focus position at the second sampling interval. The imaging apparatus according to any one of claims 1 to 3, wherein the reconfiguration is performed so that the number is smaller. An imaging device having a plurality of pixels;
A pupil division unit that restricts a light beam incident on each of the plurality of pixels to a light beam that passes through a specific pupil region of the imaging optical system,
The value of said plurality of pixels, e exchange sequence according to the angle of the light beam on the position and the pixel of the imaging surface of the virtual enters, pixels obtained by light beams passing through different pupil regions adds the value of the pixel to be incident An image generation process for reconstructing an image from
Obtaining an evaluation value for searching for a focus position from the reconstructed image; and
Reconstructs a plurality of images corresponding to the position of the imaging surface of the plurality of virtual by pre Symbol image generating step, search for the focus position by using the evaluation values obtained by the obtaining step from the plurality of reconstructed images and a control step of possess,
In the control step, after searching for an in-focus position at a first sampling interval, the in-focus position is searched for at a second sampling interval narrower than the first sampling interval based on the search. Control method for imaging apparatus.