# US 8,786,719 B2 · Image calibration method and operation method for sensor array module with wide angle

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- Number: US 8,786,719 B2
- Document ID: US8786719B2
- Status: Granted
- Kind: B2
- Application number: 13/761,623
- Filed: 2013-02-07
- Published: 2013-06-13
- Granted: 2014-07-22
- Earliest claimed: 2008-07-23
- Assignees: Pixart Imaging Inc.
- Applicants: Pixart Imaging Inc.
- Inventors: Tzu Yi Chao; Hsin Chia Chen; Chih Hsin Lin; Ren Hau Gu; Chang Che Tsai
- Web page: https://patentgrep.com/patent/US8786719B2

## CPC

- H04N 17/002: {for television cameras}
- G06T 3/4038: Image mosaicing, e.g. composing plane images from plane sub-images
- H04N 5/2624: {for obtaining an image which is composed of whole input images, e.g. splitscreen}
- H04N 23/13: with multiple sensors
- H04N 23/45: for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images
- H04N 23/698: for achieving an enlarged field of view, e.g. panoramic image capture
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL

## Abstract

A sensor array module with wide angle for creating a composite image includes a first image sensor, a second image sensor, a storage unit and a processor. The first image sensor is for capturing a first image. The second image sensor is for capturing a second image and has a relative spatial relationship with respective to the first image sensor. The storage unit stores at least one transformation matrix obtained according to the relative spatial relationship between the first and the second image sensors. The processor combines the first image and the second image by using the transformation matrix to create the composite image. The present invention also provides an image calibration method, an operation method and an application for a sensor array module with wide angle.

## Claims

### Claim 1

An image calibration method for a sensor array module with wide angle, the sensor array module comprising a first image sensor and a second image sensor, the image calibration method comprising:
determining a relative spatial relationship between the first image sensor and the second image sensor;
obtaining at least one transformation matrix according to the relative spatial relationship; and
transforming images captured by the first image sensor and/or images captured by the second image sensor to a virtual plane by using the transformation matrix,
wherein the relative spatial relationship is at least one of a transverse angle and a longitudinal angle between the first image sensor and the second image sensor.

### Claim 2 (depends on 1)

The image calibration method as claimed in claim 1, wherein the virtual plane is based on a coordinate system defined by the first image sensor or a coordinate system defined by the second image sensor.

### Claim 3 (depends on 1)

The image calibration method as claimed in claim 1, wherein a field of view of the first image sensor is overlapped with a field of view of the second image sensor.

### Claim 4 (depends on 1)

The image calibration method as claimed in claim 1, wherein a field of view of the first image sensor is non-overlapped with a field of view of the second image sensor.

### Claim 5

An operation method for a sensor array module with wide angle, the sensor array module comprising a first image sensor, a second image sensor and a storage unit storing at least one transformation matrix obtained according to a relative spatial relationship between the first image sensor and the second image sensor, the operation method comprising:
capturing a third image with the first image sensor;
capturing a fourth image with the second image sensor;
transforming the third image and/or the fourth image to a virtual plane by using the transformation matrix; and
capturing at least one characteristic parameter of object images in the virtual plane,
wherein the relative spatial relationship between the first image sensor and the second image sensor is at least one of a transverse angle and a longitudinal angle between the first image sensor and the second image sensor.

### Claim 6 (depends on 5)

The operation method as claimed in claim 5, wherein the characteristic parameter is selected from the group consisting of coordinates, areas, colors, directivities, boundaries, numbers of vertices, and aspect ratios of the object images.

### Claim 7

An operation method for a sensor array module with wide angle, the sensor array module comprising a first image sensor, a second image sensor and a storage unit storing at least one transformation matrix obtained according to a relative spatial relationship between the first image sensor and the second image sensor, the operation method comprising:
capturing a third image with the first image sensor;
generating a first characteristic parameter according to the third image;
capturing a fourth image with the second image sensor;
generating a second characteristic parameter according to the fourth image; and
transforming the first characteristic parameter and the second characteristic parameter to a virtual plane by using the transformation matrix whereby combining the first characteristic parameter and the second characteristic parameter,
wherein the relative spatial relationship between the first image sensor and the second sensor is at least one of a transverse angle and a longitudinal angle between the first image sensor and the second image sensor.

### Claim 8 (depends on 7)

The operation method as claimed in claim 7, wherein the first and the second characteristic parameters are selected from the group consisting of coordinates, areas, colors, directivities, boundaries, numbers of vertices, and aspect ratios of the object images.