Method and device for extracting effective region of fisheye image

Abstract

The embodiment of the invention discloses a method and device for extracting an effective area of a fisheye image, and the method comprises the steps: determining a horizontal center line and a vertical center line of the fisheye image according to the row number and the column number of the fisheye image; scanning the pixel points on each center line, and determining the boundary point of each center line; and equally dividing a preset number of horizontal line segments and vertical line segments formed by the boundary points, scanning pixel points on each bisector, and determining boundary points of each bisector; selecting any one vertical equally-divided line segment as a bottom edge and any one horizontal boundary point as a vertex, and any one horizontal equally-divided line segment as a bottom edge and any one vertical boundary point as a vertex to construct a triangle; and extracting an effective region from the fisheye image according to the coordinates of the center of the circumscribed circle of each triangle and the radius value. The preset number is obtained according to the fact that the effective area calculated amount is smaller than the preset value and the effective area error is smaller than the preset error value, and the effective area extraction efficiency is improved while the accuracy is guaranteed.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method and device for extracting an effective area of ​​a fisheye image. Background technique [0002] The image captured by a fisheye lens is called a fisheye image. The effective area of ​​the fisheye image including the shooting scene is a circular area in the middle of the image, and the outside of the effective area is all black. Because the fisheye lens has an ultra-wide viewing angle of nearly 180°, fisheye images contain more information than ordinary images, which makes fisheye images have great application prospects in video surveillance, panoramic synthesis, intelligent transportation and other fields. [0003] Due to the serious barrel distortion of the fisheye lens, the distortion correction of the fisheye image must be carried out before the analysis or application of the fisheye image. Existing effective area extraction methods of fisheye images mainly ...

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The least squares fitting method requires a large number of calculations ...

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