Device and method for measuring distances to multiple subjects
A device for measuring distances to multiple subjects includes an imaging optical system, a pupil orientation sensor having multiple pixels including photoelectric conversion elements arranged two-dimensionally, the pupil orientation sensor selectively receiving a light flux passed through any of the multiple regions, an image acquisition device configured to simultaneously acquire each of multiple images corresponding to the multiple regions from the pupil orientation sensor, a focusing control device configured to independently drive the physically-separated multiple lenses of the imaging optical system on the basis of the multiple images acquired by the image acquisition device to control the lenses to be focused on multiple subjects each having a different focusing distance, and a first calculation device configured to calculate each of the focusing distances to the multiple subjects respectively subjected to focusing control by the focusing control device.
1. A device for measuring distances to two subjects comprising:
an imaging optical system including a lens divided into two physically-separated lens parts, two regions of the imaging optical system each having an independent focusing distance corresponding to a combination of the two physically-separated lens parts;
a pupil orientation sensor having multiple pixels including photoelectric conversion elements arranged two-dimensionally, the pupil orientation sensor selectively receiving a light flux passed through any of the two regions;
an image acquisition processor that simultaneously acquires each of two images corresponding to the two regions from the pupil orientation sensor;
a focusing control processor that independently drives the two physically-separated lens parts of the imaging optical system on the basis of the two images acquired by the image acquisition processor to control the two physically-separated lens parts to be focused on two subjects each having a different focusing distance; and
a first calculation processor that calculates each of the focusing distances to the two subjects respectively subjected to focusing control by the focusing control processor.
2. The device for measuring distances to two subjects according to claim 1 , further comprising a second calculation processor that calculates a distance between the two subjects on the basis of the focusing distances calculated by the first calculation processor.
3. The device for measuring distances to two subjects according to claim 2 , wherein
the image acquisition processor simultaneously and successively acquires each of the two images corresponding to the two regions,
the focusing control processor independently drives the two physically-separated lens parts of the imaging optical system on the basis of the two images corresponding to the two regions which are simultaneously and successively acquired by the image acquisition processor to control the two physically-separated lens parts to be successively focused on the two subjects,
the first calculation processor successively calculates the focusing distances to the two subjects each successively subjected to the focusing control by the focusing control processor, and
the second calculation processor successively calculates the distance between the two subjects on the basis of the focusing distances which are successively calculated by the first calculation processor.
4. The device for measuring distances to two subjects according to claim 1 , further comprising a composite image generation processor that generates a composite image in which at least in-focus images of the two subjects are composited on the basis of the two images simultaneously acquired by the image acquisition processor from the pupil orientation sensor.
5. The device for measuring distances to two subjects according to claim 2 , further comprising a composite image generation processor that generates a composite image in which at least in-focus images of the two subjects are composited on the basis of the two images simultaneously acquired by the image acquisition processor from the pupil orientation sensor, and superimposing, on the composite image, character information indicating the distance between the two subjects calculated by the second calculation processor.
6. The device for measuring distances to two subjects according to claim 1 , further comprising
a subject detection processor that detects a main subject from each of the two images simultaneously acquired by the image acquisition processor, wherein
with assuming that each region containing each of the subjects detected by the subject detection processor and in the two images simultaneously acquired by the image acquisition processor is a focal point detection region, the focusing control processor independently drives the two physically-separated lens parts of the imaging optical system on the basis of an image of each focal point detection region to control the two physically-separated lens parts to be successively focused on the two subjects.
7. The device for measuring distances to two subjects according to claim 6 , wherein the focusing control processor independently drives the two physically-separated lens parts of the imaging optical system such that a contrast of the image in each focal point detection region is maximized, and controls the two physically-separated lens parts to be successively focused on the two subjects.
8. The device for measuring distances to two subjects according to claim 1 , wherein the first calculation processor has a lens position detection processor that detects lens positions of the two physically-separated lens parts which are independently driven by the focusing control processor so as to be brought into focus, and calculates the focusing distances to the two subjects on the basis of the lens positions of the two physically-separated lens parts detected by the lens position detection processor.
9. A method for measuring distances to two subjects comprising:
an image acquisition step of simultaneously acquiring each of two images corresponding to two regions from an image pickup device, the image pickup device having an imaging optical system including two physically-separated lens parts, two regions of the imaging optical system each having an independent focusing distance corresponding to a combination of the two physically-separated lens parts, and a pupil orientation sensor having multiple pixels including photoelectric conversion elements arranged two-dimensionally, the pupil orientation sensor selectively receiving a light flux passed through any of the two regions;
a focusing control step of independently driving the two physically-separated lens parts of the imaging optical system on the basis of the two images acquired in the image acquisition step to control the two physically-separated lens parts to be focused on two subjects each having a different focusing distance; and
a first calculation step of calculating each of the focusing distances to the two subjects respectively subjected to focusing control in the focusing control step.
10. The method for measuring distances to two subjects according to claim 9 , further comprising a second calculation step of calculating a distance between the two subjects on the basis of the focusing distances calculated in the first calculation step.