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Noise reduction in high dynamic range images

机译:高动态范围图像中的降噪

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摘要

Multiple images with different exposures are used to produce a high dynamic range (HDR) image. Sometimes high-sensitivity setting is needed for capturing images in low light condition as in an indoor room. However, current digital cameras do not produce a high-quality HDR image when noise occurs in low light condition or high-sensitivity setting. In this paper, we propose a noise reduction method in generating HDR images using a set of low dynamic range (LDR) images with different exposures, where ghost artifacts are effectively removed by image registration and local motion information. In high-sensitivity setting, motion information is used in generating a HDR image. We analyze the characteristics of the proposed method and compare the performance of the proposed and existing HDR image generation methods, in which Reinhard et al.'s global tone mapping method is used for displaying the final HDR images. Experiments with several sets of test LDR images with different exposures show that the proposed method gives better performance than existing methods in terms of visual quality and computation time.
机译:具有不同曝光的多张图像用于生成高动态范围(HDR)图像。有时需要像在室内一样在低光照条件下拍摄图像时需要高感光度设置。但是,当在弱光条件下或高感光度设置下出现噪声时,当前的数码相机无法生成高质量的HDR图像。在本文中,我们提出了一种使用一组具有不同曝光量的低动态范围(LDR)图像来生成HDR图像的降噪方法,其中可以通过图像配准和局部运动信息有效地消除重影伪影。在高灵敏度设置中,运动信息用于生成HDR图像。我们分析了提出的方法的特性,并比较了提出的和现有的HDR图像生成方法的性能,其中Reinhard等人的全局色调映射方法用于显示最终的HDR图像。对具有不同曝光量的多组测试LDR图像进行的实验表明,该方法在视觉质量和计算时间方面比现有方法具有更好的性能。

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