# US 2019/0377166 A1 · Imaging apparatus, signal processing method for imaging apparatus, and signal processing program for imaging apparatus

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- Number: US 2019/0377166 A1
- Document ID: US20190377166A1
- Status: Published application
- Kind: A1
- Application number: 16/549,522
- Filed: 2019-08-23
- Published: 2019-12-12
- Earliest claimed: 2017-03-14
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Daiki KOMATSU; Yosuke NARUSE; Kenkichi HAYASHI; Yoshiaki ISHII; Yasunobu KISHINE
- Web page: https://patentgrep.com/patent/US20190377166A1

## CPC

- G02B 15/16: with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group (G02B15/22 takes precedence)
- G02B 15/173: arranged +-+
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B 15/144109: {arranged +--+}
- G02B 15/17: arranged +--
- G03B 3/10: Power-operated focusing
- G03B 17/14: interchangeably
- H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof
- H04N 23/69: Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
- H04N 23/80: Camera processing pipelines; Components thereof
- H04N 23/951: by using two or more images to influence resolution, frame rate or aspect ratio
- G03B 2205/0046: Movement of one or more optical elements for zooming
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

Provided are an imaging apparatus, a signal processing method for an imaging apparatus, and a non-transitory computer readable recording medium storing a signal processing program for an imaging apparatus capable of capturing a high quality image with a compact configuration. An imaging lens 10A is composed of, in order from an object side, a first lens group G1 that is fixed during variable magnification, a second lens group G2 and a third lens group G3 that move during variable magnification, and a fourth lens group G4 that is fixed during variable magnification. The first lens group G1 is composed, in order from the object side, a first-a lens group G1a that is fixed during focusing, a first-b lens group G1b that moves during focusing, and a first lens group rear group G1c that is fixed during focusing. Fluctuation of an angle of view with focusing is corrected through image processing.

## Claims

### Claim 1

An imaging apparatus comprising:
a zoom lens comprising, in order from an object side, a first lens group that is fixed during variable magnification, a plurality of movable lens groups that move during variable magnification, and a final lens group that is fixed during variable magnification, the first lens group comprising, in order from the object side, a first-a lens group that is fixed during focusing and a first-b lens group that moves during focusing;
an image sensor that captures an image formed by the zoom lens;
a source image data generation unit that processes a signal output from the image sensor to generate source image data, the signal being output from an effective area set as an area where a normal image is to be captured;
an image output unit that extracts and outputs image data of an output area set within the effective area from the source image data; and
an angle-of-view correction unit that subjects the source image data to magnification and reduction processing to correct an angle of view of the image data of the output area, and in a case where the angle of view of the image data of the output area fluctuates with focusing, subjects the source image data to the magnification and reduction processing in conjunction with focusing and corrects the angle of view of the image data of the output area to a reference angle of view determined for each focal length,
wherein the zoom lens further comprises
an imaging apparatus information acquisition unit that acquires information regarding a size of the image sensor from an imaging apparatus body in which the zoom lens is mounted, and
an area setting unit that sets the effective area and the output area based on information regarding a size of an image circle of the zoom lens and information regarding the size of the image sensor.

### Claim 2 (depends on 1)

The imaging apparatus according to claim 1,
wherein the reference angle of view is set to a minimum angle of view out of the angle of view of the image data of the output area fluctuating with focusing at each focal length, and
the angle-of-view correction unit corrects the angle of view of the image data of the output area through magnification processing.

### Claim 3 (depends on 1)

The imaging apparatus according to claim 1,
wherein the reference angle of view is set to a maximum angle of view out of the angle of view of the image data of the output area fluctuating with focusing at each focal length, and
the angle-of-view correction unit corrects the angle of view of the image data of the output area through reduction processing.

### Claim 4 (depends on 1)

The imaging apparatus according to claim 1,
wherein the reference angle of view is set to a minimum angle of view out of the angle of view of the effective area fluctuating with focusing at each focal length, and
the angle-of-view correction unit corrects the angle of view of the image data of the output area through reduction processing in a case where the angle of view of the image data of the output area is reduced smaller than the reference angle of view with focusing, and corrects the angle of view of the image data of the output area through magnification processing in a case where the angle of view of the image data of the output area is magnified greater than the reference angle of view with focusing.

### Claim 5 (depends on 1)

The imaging apparatus according to claim 1, further comprising:
in a case where the zoom lens is interchangeable,
a lens information acquisition unit that acquires information regarding a size of an image circle from the mounted zoom lens; and
an area setting unit that sets the effective area and the output area based on information regarding to the size of the image circle of the mounted zoom lens and information regarding a size of the image sensor.

### Claim 6 (depends on 2)

The imaging apparatus according to claim 2, further comprising:
in a case where the zoom lens is interchangeable,
a lens information acquisition unit that acquires information regarding a size of an image circle from the mounted zoom lens; and
an area setting unit that sets the effective area and the output area based on information regarding to the size of the image circle of the mounted zoom lens and information regarding a size of the image sensor.

### Claim 7 (depends on 3)

The imaging apparatus according to claim 3, further comprising:
in a case where the zoom lens is interchangeable,
a lens information acquisition unit that acquires information regarding a size of an image circle from the mounted zoom lens; and
an area setting unit that sets the effective area and the output area based on information regarding to the size of the image circle of the mounted zoom lens and information regarding a size of the image sensor.

### Claim 8 (depends on 4)

The imaging apparatus according to claim 4, further comprising:
in a case where the zoom lens is interchangeable,
a lens information acquisition unit that acquires information regarding a size of an image circle from the mounted zoom lens; and
an area setting unit that sets the effective area and the output area based on information regarding to the size of the image circle of the mounted zoom lens and information regarding a size of the image sensor.

### Claim 9

A signal processing method for an imaging apparatus,
wherein the imaging apparatus comprises a zoom lens comprising, in order from an object side, a first lens group that is fixed during variable magnification, a plurality of movable lens groups that move during variable magnification, and a final lens group that is fixed during variable magnification, the first lens group comprising, in order from the object side, a first-a lens group that is fixed during focusing and a first-b lens group that moves during focusing, and an image sensor that captures an image formed by the zoom lens,
the signal processing method comprises:
a step of processing a signal output from the image sensor to generate source image data, the signal being output from an effective area set as an area where a normal image is to be captured;
a step of extracting and outputting image data of an output area set within the effective area from the source image data;
a step of subjecting the source image data to magnification and reduction processing to correct an angle of view of the image data of the output area, and in a case where the angle of view of the image data of the output area fluctuates with focusing, subjecting the source image data to the magnification and reduction processing in conjunction with focusing and correcting the angle of view of the image data of the output area to a reference angle of view determined for each focal length;
a step of acquiring information regarding a size of the image sensor from an imaging apparatus body in which the zoom lens is mounted; and
a step of setting the effective area and the output area based on information regarding a size of an image circle of the zoom lens and information regarding the size of the image sensor.

### Claim 10

A non-transitory computer readable recording medium storing a signal processing program for an imaging apparatus,
wherein the imaging apparatus comprises a zoom lens comprising, in order from an object side, a first lens group that is fixed during variable magnification, a plurality of movable lens groups that move during variable magnification, and a final lens group that is fixed during variable magnification, the first lens group comprising, in order from the object side, a first-a lens group that is fixed during focusing and a first-b lens group that moves during focusing, and an image sensor that captures an image formed by the zoom lens,
the signal processing program causes a computer to implement
a function of processing a signal output from the image sensor to generate source image data, the signal being output from an effective area set as an area where a normal image is to be captured;
a function of extracting and outputting image data of an output area set within the effective area from the source image data;
a function of subjecting the source image data to magnification and reduction processing to correct an angle of view of the image data of the output area, and in a case where the angle of view of the image data of the output area fluctuates with focusing, subjecting the source image data to the magnification and reduction processing in conjunction with focusing and correcting the angle of view of the image data of the output area to a reference angle of view determined for each focal length;
a function of acquiring information regarding a size of the image sensor from an imaging apparatus body in which the zoom lens is mounted; and
a function of setting the effective area and the output area based on information regarding a size of an image circle of the zoom lens and information regarding the size of the image sensor.