# US 2018/0027199 A1 · Image processing apparatus, image capture apparatus, and method for controlling the same

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- Number: US 2018/0027199 A1
- Document ID: US20180027199A1
- Status: Published application
- Kind: A1
- Application number: 15/643,511
- Filed: 2017-07-07
- Published: 2018-01-25
- Earliest claimed: 2016-07-22
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Toshiyuki Okubo
- Web page: https://patentgrep.com/patent/US20180027199A1

## CPC

- H04N 25/683: by defect estimation performed on the scene signal, e.g. real time or on the fly detection
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An image capture apparatus serving as an image processing apparatus generates a combined image by combining a plurality of captured images. The image capture apparatus determines a pixel of interest among the captured images as a correction target pixel if a difference between a signal level of the pixel of interest and that of the peripheral pixels is greater than or equal to a threshold. The image capture apparatus performs the above determination with respect to the captured image prior to the combination by using a first threshold, and performs the above determination with respect to the combined image by using a second threshold lower than the first threshold, and sets the second threshold with respect to the combined image lower the larger the number of the combined captured images is.

## Claims

### Claim 1

An image processing apparatus, comprising:
circuitry which
combines a plurality of captured images by shooting an object to generate a combined image; and
determines a pixel of interest on the captured images as a correction target pixel if a difference between a signal level of the pixel of interest and a value obtained from the signal level of peripheral pixels is greater than or equal to a threshold,
wherein the circuitry performs the determination on the captured image prior to the combination by using a first threshold, and performs the determination with respect to the combined image by using a second threshold lower than the first threshold, and sets the second threshold with respect to the combined image lower the larger the number of the combined captured images is.

### Claim 2 (depends on 1)

The image processing apparatus according to claim 1, wherein the circuitry alters the first threshold and the second threshold depending on a shooting condition in shooting the object.

### Claim 3 (depends on 2)

The image processing apparatus according to claim 2, wherein the circuitry sets the first threshold and the second threshold to be higher the higher ISO sensitivity in shooting the object is.

### Claim 4 (depends on 2)

The image processing apparatus according to claim 2, wherein the circuitry sets the first threshold and the second threshold to be higher the longer a shutter time in shooting the object is.

### Claim 5

An image capture apparatus, comprising:
an imaging element which generates a captured image; and
circuitry which
combines a plurality of captured images by shooting an object to generate a combined image; and
determines a pixel of interest on the captured images as a correction target pixel if a difference between a signal level of the pixel of interest and a value obtained from the signal level of peripheral pixels is greater than or equal to a threshold,
wherein the circuitry performs the determination on the captured image prior to the combination by using a first threshold, and performs the determination with respect to the combined image by using a second threshold lower than the first threshold, and sets the second threshold with respect to the combined image lower the larger the number of the combined captured images is.

### Claim 6

A control method of an image processing apparatus, comprising:
combining a plurality of captured images to generate a combined image; and
determining a pixel of interest on the captured images as a correction target pixel if a difference between a signal level of the pixel of interest and a value obtained from the signal level of the peripheral pixels is greater than or equal to a threshold,
wherein the determination is performed with respect to the captured image prior to the combining by using a first threshold, and the determination is performed with respect to the combined image by using a second threshold lower than the first threshold, and the second threshold with respect to the combined image is set lower the larger the number of the combined captured images is.