# US 2014/0192239 A1 · Image apparatus and imaging method

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- Number: US 2014/0192239 A1
- Document ID: US20140192239A1
- Status: Published application
- Kind: A1
- Application number: 14/145,877
- Filed: 2013-12-31
- Published: 2014-07-10
- Earliest claimed: 2013-01-07
- Assignees: Olympus Imaging Corp.
- Applicants: Olympus Imaging Corp.
- Inventors: Takeyuki AJITO
- Web page: https://patentgrep.com/patent/US20140192239A1

## CPC

- H04N 23/76: by influencing the image signals
- H04N 23/631: {Graphical user interfaces [GUI] specially adapted for controlling image capture or setting capture parameters}
- H04N 23/663: for controlling interchangeable camera parts based on electronic image sensor signals
- H04N 23/673: {based on contrast or high frequency components of image signals, e.g. hill climbing method}
- H04N 25/134: {based on three different wavelength filter elements}
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An imaging apparatus includes an imaging element, a correction value calculating unit, and a correction unit. The imaging element images an object through a photographing lens to generate an image signal. The correction value calculating unit calculates correction values for a plurality of frequency components of the image signal, the correction values corresponding to an aperture value acquired when the object is imaged through the photographing lens. The correction unit corrects frequency characteristics of the plurality of frequency components in accordance with the correction values calculated.

## Claims

### Claim 1

An imaging apparatus comprising:
an imaging element which images an object through a photographing lens to generate an image signal;
a correction value calculating unit which calculates correction values for a plurality of frequency components of the image signal, the correction values corresponding to an aperture value acquired when the object is imaged through the photographing lens; and
a correction unit which corrects frequency characteristics of the plurality of frequency components in accordance with the correction values calculated.

### Claim 2 (depends on 1)

The imaging apparatus according to claim 1, wherein the correction value calculating unit calculates the correction value for each of the frequency components from lens frequency characteristic information set in association with each of the aperture values for the photographing lens and pixel pitch information about the imaging element.

### Claim 3 (depends on 2)

The imaging apparatus according to claim 2, wherein the photographing lens is an exchange lens made detachable from a main body of the imaging apparatus and having a memory storing the lens frequency characteristic information, and a memory is further provided, which stores the pixel pitch information.

### Claim 4 (depends on 1)

The imaging apparatus according to claim 1, wherein the photographing lens is provided integral with a main body of the imaging apparatus, and the correction value calculating unit comprises a memory storing the correction values calculated beforehand.

### Claim 5 (depends on 2)

The imaging apparatus according to claim 2, wherein the frequency components are a high-frequency component and a low-frequency component, and the correction value calculating unit calculates, for the high-frequency component, a correction value that decreases as the aperture value increases in a range above a value predetermined by the lens frequency characteristic information, and for the low-frequency component, a correction value that increases as the aperture value increases in the range above the value predetermined by the lens frequency characteristic information.

### Claim 6 (depends on 1)

The imaging apparatus according to claim 1, wherein the correction unit extracts edge signals corresponding to the frequency components, respectively, and corrects the edge signals in accordance with the correction values calculated, thereby to acquire correction edge signals, and uses the correction edge signals, thereby to correct the frequency characteristics of the frequency components of the image signal.

### Claim 7

An imaging method comprising:
imaging an object through a photographing lens by using an imaging element to generate an image signal;
calculating correction values for a plurality of frequency components of the image signal by using a correction value calculating unit, the correction values corresponding to an aperture value acquired when the object is imaged through the photographing lens; and
correcting frequency characteristics of the plurality of frequency components by using a correction unit in accordance with the correction values calculated.