Effective area extraction method of fisheye image

A fisheye image and effective area technology, applied in the field of image processing, can solve the problems of fisheye image bending, poor fisheye image correction effect, inaccurate fisheye image extraction, etc.

Active Publication Date: 2019-12-24
YANGTZE NORMAL UNIVERSITY
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Problems solved by technology

However, in the actual operation process, the edges of the fisheye image are relatively blurred. If the image is binarized, the edges of the fisheye im...

Method used

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  • Effective area extraction method of fisheye image
  • Effective area extraction method of fisheye image
  • Effective area extraction method of fisheye image

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Embodiment

[0054] This embodiment discloses a method for extracting an effective area of ​​a fisheye image.

[0055] Such as figure 1 Shown: An effective area extraction method for fisheye images, including:

[0056] S1: Acquire a noisy fisheye image, perform image denoising processing and image grayscale processing on the noisy fisheye image, and generate a denoised grayscale fisheye image;

[0057] S2: Calculate the center coordinates (C′) of the effective area of ​​the grayscale fisheye image by level set algorithm x ,C' y ) and radius R';

[0058] S3: According to the center coordinates of the effective area of ​​the grayscale fisheye image (C′ x ,C' y ) and radius R′, calculate and extract the effective area of ​​the grayscale fisheye image.

[0059] In step S1, image denoising processing is performed on the fisheye image by using a mean value filter; image grayscale processing is performed on the fisheye image by using a weighted average algorithm.

[0060] In step S2, the c...

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Abstract

The invention relates to the technical field of image processing, in particular to an effective area extraction method of a fisheye image. The method comprises the steps of S1, obtaining the fisheye image, and performing image gray processing on the fisheye image to generate a gray fisheye image; S2, calculating a circle center coordinate (C'x, C'y) and a radius R' of an effective area of the grayscale fisheye image through a level set algorithm; and S3, calculating and extracting the effective area of the gray scale fisheye image according to the circle center coordinates (C'x, C'y) and theradius R ' of the effective area of the gray scale fisheye image. According to the effective area extraction method of the fisheye image, the effective area can be accurately extracted under the condition that the edge of the fisheye image is blurred or the light spots exist, and therefore the correction effect on the fisheye image can be improved in an auxiliary manner.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for extracting an effective area of ​​a fisheye image. Background technique [0002] Image stitching is widely used in scientific and engineering fields such as medical images, geological surveys, and panoramic roaming. The analysis needs to use a full-view image. Currently, the camera shooting angle is limited, and it is impossible to directly generate a panoramic photo with the same camera. It is usually taken to obtain a group of photos with overlapping areas within a period of time, and then use software to stitch them together to finally obtain panoramic photos. Generally, the angle of view of the lens is small, and many pictures are needed to stitch together a panorama. Therefore, the fisheye lens has an irreplaceable role. [0003] The fisheye head has a bulging fisheye, and the captured image is seriously distorted. Compared with the flat lens of ordi...

Claims

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Application Information

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IPC IPC(8): G06T3/00G06T5/00G06T7/11
CPCG06T3/0018G06T5/002G06T5/006G06T7/11
Inventor 吴雪刚杜同心杨维斌房斌杨颖张金龙
Owner YANGTZE NORMAL UNIVERSITY
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