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Research on Panoramic Vision Image Based on Fisheye Lens

Author: SunLiHua
Tutor: XiZhiHong
School: Harbin Engineering University
Course: Communication and Information System
Keywords: Panoramic vision Fisheye Distortion correction Windows Splice
CLC: TP391.41
Type: Master's thesis
Year: 2008
Downloads: 356
Quote: 8
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Abstract


Panoramic vision is greater than the three-dimensional space of the hemispheric field of view (360 ° × 180 °) visual information at once . Open because of its sight , rely on visual information in the field of civil , military as well as aerospace space industry has a very important significance to make decisions . Is widespread concern in the panoramic vision sensing technology is mainly the first two methods mirror and fish-eye mirror image quality is greatly reduced due to a serious loss of light reflected twice , imaging pixels , followed by the camera itself will be imaged in the image , resulting in the observation of the \The fisheye lens is a short focal length (f = 6-16mm) a large field of view ( FOV of approximately 180 ° or 270 °) imaging lens . Seen by optical imaging principle , the shorter the focal length , the greater the angle , the image distortion greater . The fisheye image distortion serious , it is necessary to be corrected to a people are accustomed to the image . Image before correction , the first need to extract the effective region of the fish -eye image , the study existing extraction methods on the basis of the effective area , the paper according to the brightness of the effective area within the limit differential than the outer limit of the effective region brightness differential to be characteristics of a large , brightness difference of the extraction method is proposed based on the test results show that the method is more accurate than the area of ??statistical method , fast . Distortion problem for based the longitude correction method there arched proportional correction method , the method does not require the parameters of the imaging system as well as the mathematical projection model , the test results show that the algorithm basically eliminated arch distortion . Panoramic image size , and the monitor interface is usually relatively small in order to achieve a special area of focus monitoring, and magnified observation optical center and fisheye image correction combine to achieve the correction of a fish-eye image of the region of interest window , which for the next step to moving target tracking , monitoring the foundation . Monitoring the size of the camera CCD imaging , it is sometimes not a complete panoramic image , according to the characteristics of the fish-eye image using SIFT algorithm fisheye image stitching . The test results show that the effect of splicing .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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