Dr. Shaojun Zhang Profile

Dr. Shaojun Zhang

at Changchun Univ of Science and Technology

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Proceedings Article | 15 October 2015 Paper

Research on auto-calibration technology of the image plane's center of 360-degree and all round looking camera

Shaojun Zhang, Xiping Xu

Proceedings Volume 9676, 967606 (2015) https://doi.org/10.1117/12.2197561

KEYWORDS: Cameras, Image processing, Image sensors, Calibration, Detection and tracking algorithms, Image compression, Image filtering, Hough transforms, CMOS sensors, Radium

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The 360-degree and all round looking camera, as its characteristics of suitable for automatic analysis and judgment on the ambient environment of the carrier by image recognition algorithm, is usually applied to opto-electronic radar of robots and smart cars. In order to ensure the stability and consistency of image processing results of mass production, it is necessary to make sure the centers of image planes of different cameras are coincident, which requires to calibrate the position of the image plane’s center. The traditional mechanical calibration method and electronic adjusting mode of inputting the offsets manually, both exist the problem of relying on human eyes, inefficiency and large range of error distribution. In this paper, an approach of auto- calibration of the image plane of this camera is presented. The imaging of the 360-degree and all round looking camera is a ring-shaped image consisting of two concentric circles, the center of the image is a smaller circle and the outside is a bigger circle. The realization of the technology is just to exploit the above characteristics. Recognizing the two circles through HOUGH TRANSFORM algorithm and calculating the center position, we can get the accurate center of image, that the deviation of the central location of the optic axis and image sensor. The program will set up the image sensor chip through I2C bus automatically, we can adjusting the center of the image plane automatically and accurately. The technique has been applied to practice, promotes productivity and guarantees the consistent quality of products.

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