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带钢表面缺陷图像检测理论及识别算法研究
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摘要
轧制钢板是工业生产中的重要材料,钢板的质量直接影响到终端产品的质量。钢板的表面缺陷是影响钢板质量的重要因素,除了通过改进轧制工艺,以减少缺陷发生外,及时检测出钢板的表面缺陷也非常重要。本文深入研究了轧制钢板表面缺陷图像检测理论和识别算法,主要包括如下几方面内容:
     基于缺陷检测和分类识别分步进行的思想,提出采用图像复杂度快速检测钢板表面缺陷的方法,从提高检测可靠性和节约检测时间出发,对四种图像复杂度描述参数的缺陷图像检测结果进行对比,根据检测结果,以图像的像素变化率作为图像复杂度描述参数进行缺陷图像检测,通过现场图像仿真,该方法能够正确检测出图像中的缺陷并且耗时较少,可以满足在线检测要求。
     针对带钢表面背景区域纹理对分割产生的影响,提出采用图像局部复杂度和局部方差相结合的方法对背景纹理进行弱化,并采用基于Gaussian高频滤波方法对缺陷图像进行同态滤波,以去除图像亮斑、增强对比度,选用PSNR、MSE和Q值三个参数对滤波后图像进行评价,通过与常用的直方图均衡增强方法进行对比发现,其视觉和参数表现均更好。
     基于视觉注意机制的缺陷图像分割,提出早期视觉特征选择方法,通过对缺陷图像的分析,选取灰度图像的亮度特征、稀少性特征、局部复杂度特征作为生成特征显著度图的早期特征,并给出计算表达式,以此为基础生成各特征显著度图,并采用Gaussian滤波获取全局特征显著度图。
     提出改进的视觉特征显著度图融合方法,采用归一化特征显著度图的复杂度和熵值作为参数进行融合以得到综合显著度图,能够体现不同特征显著度图对综合显著度图的贡献差异;采用最大熵法对综合显著度图缺陷分割,通过与聚类分割法和区域增长分割法比较发现,改进后的视觉注意分割法能够获得更好的分割效果。
     分析图像各种特征的适应性,提出缺陷图像的特征选取方法,充分考虑分割前后图像包含的不同信息,提取反映缺陷图像全局特征的纹理特征值、反映分割后缺陷形状特征的不变矩特征值和反映缺陷分布情况的离散度特征值,并将上述特征值作为缺陷图像的分类依据。
     将可拓理论引入缺陷图像分类中,讨论了可拓理论用于缺陷图像分类的可行性;提出改进的关联度计算方法,给出了计算表达式,并进行了有效性论证。以待分物元的实际特征值与不同类别经典域的距的绝对值和各距绝对值之和的商来计算关联度加权系数,强化了待分类缺陷自身特征值对最终关联度值的影响,分类结果显示较原有的关联度计算方法有更好的效果。
     通过统计分析获取缺陷类别特征值的经典域和节域,选取七类缺陷进行分类仿真,采用改进后的关联度计算方法获取待分类缺陷相对于各类缺陷的综合关联度,以最大关联度判断待分类缺陷所属缺陷类别,分类正确率接近90%,有效提高了分类正确率。
Rolled steel strips are important materials in industrial productions, so the quality of steelstrips will have serious influence on that of end products.Surface defects on steel strips aresignificant factors in evaluating quality of them. Except improving rolling technology todecrease defects,Detecting defects in time to avoide application of defects’ strip in endproducts is also very important.Algorithms and theories of defects detecting on rolled steelstrip surfaces by images are researched in this article.The research topics are as follows:
     Quick defects detecting method is brought forward based on the principal that defectsdetecting and classification carried out in stages.Image complexity is introduced to quicklydetect defects on steel strip surfaces.Proceeding from reliability and time saving, four imagecomplexity describling parameters are compared to each other in detecting results, finallyRPVC is selected to detect defects on strip surfaces. Simulation shows that RPVC can detectdefects correctly using shorter time and realize detecting in time.
     Defects images preprocessing is also researched in this article, in view of the influenceon defect segmentation by textures on images’ background, combination of local complexityand local variance is applied to weaken background textures and Gaussian high frequencyfilter is used to homomorphicly filter defects’ images to wipe of bright spot and enhancecontrast. Three parameters are selected to evaluate the quality of filtered images andcompared to the results of histogram enhancing, all shows better effects.
     Visual features selection method is put forward to segment defect images by visualattention mechanism. After analysis of defect images, brightness, rareness and localcomplexity are selected to be features to generate salient images, expressions of them areprovided. Gaussian filter is used to get global salient images.
     Improved salient images fused method is brought forward. We modified the weightcoefficients of feature salient images fusion computering method, Normalized complexity andentropy values of salient images are used as weight to generate comprehensive salient image,this can reflect the differences of different salient images’ contribution to comprehensivesalient image. Maximum entropy is used to segment comprehensive salient images,compare with results of K-means method and region-growing method, the improvedsegmentation method based on visual attention model has better effect.
     For the purpose of defects classification, defect images’ features selecting method isprovided after analyzing the adaptability of different characters of them. In view of differentinformations included in unsegmented and segmented images, texture features, invariant moment features and dispersion are selected to be classification features.
     Extenics theory is introduced into images classification.Feasibility of extenics theory inimages classification is discussed. Weight coefficients of defects images unspecifided topre-selected types of defects images in computering relevancy values are improved and theexpression is provided, the effectiveness of the improved computering method is alsodemonstrated. The quotients of distance between feature values and classical domain andsum of these distances are used as weight coffecients in computering comprehensiverelevancy values.This computering method enhances the influences of defects’ self featurevalues on comprehensive relevancy..
     Classical domain and joint domain are key parameters in application of extenics theory,they are gotten by statistics analysis of a number of defects images.Seven defects types areselected to simulate the method, maximum relevancy value is used to group the unspecifieddefect image in one of preselected defect types, classification accuracy is close to90%,comparing to primary weight coefficient computering method, the improved theory is moreeffective in defects images classification.
引文
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