一种改进型增强图像处理算法研究与应用
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摘要
常规的基于高斯或拉普拉斯模板的锐化或增强算法应用中,都会出现包边的现象,即在与邻域有强烈对比的目标上会出现明显的暗或亮包边问题。常规方法未对该现象进行处理,导致部分场景目标存在明显的包边现象。基于常规算法产生的包边问题的原因分析,发现主要是在获取高频图像信息时,采用高斯或拉普拉斯这种基于位置差异计算权重的方式导致;因此在进行获取高频细节时,通过增加以灰度差值来调整权重方式来获取细节,或采用更简单的高频细节截止的处理方式,可有效改善增强算法中的包边问题。
Conventional sharpening or enhancement algorithms based on Gauss or Laplasse templates are discussed,while the hemming phenomenon exists usually with obviously dark or bright wrapping problems,contrasted with the adjacent images.By weights calculating based on positional differences with Gauss or Laplasse,conventional algorithm can cause image wrapping in high frequency image information.Therefore,in processing of high frequency details,the method is put forward by adding weights to adjust weights mode with gray scale differences or adopting simpler high frequency detail cut-off mode.Results show the edge-wrapping problem with enhancement algorithm is effectively improved.
Conventional sharpening or enhancement algorithms based on Gauss or Laplasse templates are discussed,while the hemming phenomenon exists usually with obviously dark or bright wrapping problems,contrasted with the adjacent images.By weights calculating based on positional differences with Gauss or Laplasse,conventional algorithm can cause image wrapping in high frequency image information.Therefore,in processing of high frequency details,the method is put forward by adding weights to adjust weights mode with gray scale differences or adopting simpler high frequency detail cut-off mode.Results show the edge-wrapping problem with enhancement algorithm is effectively improved.
引文
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[3] YANG Ying,DAI Bin.Character images uneven illumination correction method based on Gaussian frequency low pass filtering and image difference [J].Journal of Huazhong normal university:Nat.Sci.,2013,47(2):181-184.(in Chinese)杨颖,戴彬.基于高斯频域低通滤波和图像差分的字符图像光照不均校正法[J].华中师范大学学报:自科版,2013,47(2):181-184.
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[6] YE Xiaojie,ZHAO Jufeng,GONG Xiaoli,et al.Infrared image enhancement for dim target based on edge weight analysis [J].Laser & Infrared,2018,48(1):119-123.(in Chinese)叶晓杰,赵巨峰,公晓丽等.基于边缘权重分析的水面弱目标红外增强[J].激光与红外,2018,48(1):119-123.