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A combined effect of local and global method for contrast image enhancement

机译:局部和全局方法对比图像增强的综合影响

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Image enhancement is used to improve the digital quality of image. It is used to improve the poor quality of image that is too used to improve bad quality of picture into good picture or image. This paper suggests a combination of local and global method for contrast image enhancement. Global contrast image enhancement improves low contrast of image in a global way. This type of global enhancement avoids noise and other ringing artifacts of a digital image. In global contrast image enhancement when high contrast occurs it causes under exposure on some part of image and over exposure on some other part of an image. Global contrast image enhancement has much advantage but it lack in local enhancement of image means it lacks the local detail of an image. When we use local detail of an image, the local detail of an image can be defined in better way. Local contrast image enhancement increases noise of an image when high contrast gain occurs. When we use global contrast image enhancement or local contrast image enhancement single handedly it is not beneficial but when we use combination of local and global method it gives us better results for certain images. In this paper we will going to use global contrast stretching method for global contrast image enhancement. In local contrast image enhancement method we are using unsharp masking technique to enhance the local detail of an image. The main aim of using this combination of local and global method is to preserve the brightness of an image when contrast image enhancement is done.
机译:图像增强用于提高图像的数字质量。它用于提高图像的差的图像质量差,这些图像也用于将图像质量不好的图像变为良好的图像或图像。本文表明了局部和全局方法的组合,用于对比图像增强。全球对比图像增强以全球化方式提高了图像的低对比度。这种类型的全局增强避免了数字图像的噪声和其他振铃伪像。在全局对比图像中,当高对比度发生时,它会在图像的某些部分和图像的某些其他部分暴露上导致曝光。全局对比图像增强具有很大的优势,但它缺乏图像的局部增强意味着它缺乏图像的局部细节。当我们使用图像的本地细节时,可以以更好的方式定义图像的本地细节。当发生高对比度增益时,本地对比度图像增强增加了图像的噪声。当我们使用全局对比图像增强或局部对比图像增强单独使用时,它不是有益的,而是当我们使用本地和全局方法的组合时,它为我们提供了某些图像的更好结果。在本文中,我们将使用全局对比拉伸方法进行全局对比图像增强。在局部对比图像增强方法中,我们使用的是非锐化掩蔽技术来增强图像的本地细节。使用本地和全局方法组合的主要目的是在对比度图像增强时保留图像的亮度。

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