新的桶形畸变的点阵样板校正方法

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1、新的桶形畸变的点阵样板校正方法摘要:为了校正广角镜头的桶形畸变，提出一种新的桶形畸变数字校正方法。它使用点阵样板校正的方法，根据畸变图和理想图中圆点的位置关系，得出畸变图像素在x轴和y轴方向上的偏移量曲面，采用三次b插值函数对曲面插值;由曲面插值获取像素点的偏移量，对各像素进行坐标转换得到校正图像;然后对图像进行了双线性插值的灰度重建。仿真结果表明，该方法使图像的坐标位置和灰度都得到很好的校正。关键词:广角镜头；畸变校正；曲面插值；图像处理；桶形失真newmethodofcorrectingbarreldistortiononlatticemod

2、elwukai.xing,duanma.li*schoolofinformationandelectricalengineering,hebeiuniversityofengineering,handanhebei056038,chinaabstract:inordertocorrectthebarreldistortionofwide.anglelens,anewmethodfordistortioncorrectionforbarreldistortionisproposed.thelatticemodelcalibrationmethod

3、isused,accordingtothelocationrelationofdotbetweendistortionimageandidealfigure,togettheoffsetsurfaceinx.andy.axisdirectionaboutdistortedpixels.then,thecubicb.splineinterpolationfunctionisadoptedtointerpolatethesurface.thus,theoffsetsofeachpixelareobtainedinthedistortedimage.furt

4、hermore,thepixelsshiftisrectifiedtoachieveanundistortedimagebycoordinateconversion.andthenthebilinearinterpolationisusedtoreconstructthegraylevelofpixels.thesimulationresultsshowthattheproposedmethodcanmakeagoodcorrectionofthecoordinatepositionandgrayvalue.inordertocorrectthebar

5、reldistortionofwide.anglelens,anewmethodfordistortioncorrectionforbarreldistortionwasproposed.adoptingthelatticemodelcalibrationmethod,accordingtothelocationrelationofdotsbetweendistortionimageandidealfigure,theoffsetsurfacesinx.andy.axisdirectionaboutdistortedpixelsweregot.then

6、,thecubicb.splineinterpolationfunctionwasadoptedtointerpolatethesurface.thus,theoffsetsofeachpixelwereobtainedinthedistortedimage.furthermore,thepixelsshiftwasrectifiedtoachieveanundistortedimagebycoordinateconversion.andthenthebilinearinterpolationwasusedtoreconstructthegraylev

7、elofpixels.thesimulationresultsshowthattheproposedmethodcanmakeagoodcorrectionofthecoordinatepositionandgrayvalue.keywords:wide.anglelens;distortioncorrection;surfaceinterpolation;imageprocessing;barreldistortion0引言目前，在图像处理系统中，具有宽视场的广角镜头有着广泛的用途，如电子内窥镜系统、车载监控系统、跟踪制导和违章驾驶拍摄等［1

8、］。但是广角镜头在获得宽视场和特殊拍摄效果的同时，也带来了桶形畸变，这一点限制了在测量领域的应