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首页> 外文会议>2015 Nordic Circuits and Systems Conference: NORCHIP amp; International Symposium on System-on-Chip >Fixed pattern noise correction for wide dynamic range CMOS image sensor with Reinhard tone mapping operator
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Fixed pattern noise correction for wide dynamic range CMOS image sensor with Reinhard tone mapping operator

机译：使用Reinhard色调映射运算符的宽动态范围CMOS图像传感器的固定模式噪声校正

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摘要

This paper presents an investigation and a correction technique for fixed pattern noise in wide dynamic range image sensor with on the focal plane Reinhard tone mapping. The Human eye is capable of capturing images over a wide dynamic range of illumination; however, typical CMOS image sensors have limited ability to capture dynamic range available in nature. Even when wide dynamic range images are captured, they need to be displayed on conventional media with limited ability to display WDR scenes. Hence, the image has algorithmically transformed by mathematical operators called tone mapping operators to fit the limited dynamic range. In this paper, we report our research on a pixel, which captures a scene with inbuilt tone mapping operator, particularly, the Reinhard photographic mapping operator, which is a monotonically increasing function. However, the inherent Fixed pattern noise(FPN) limits the performance of image sensors. This is mainly due to the variations between the responses of individual pixels within an array of pixels. A simple procedure has been adapted to reduce FPN in which parametric response of the pixel is used, with FPN modeled as variations in the individual parameters. The parameters of each individual pixel are measured, recorded and then used to correct their response.
机译：本文提出了一种在焦平面上采用莱因哈德色调映射的宽动态范围图像传感器中固定模式噪声的研究和校正技术。人眼能够在宽广的动态照明范围内捕获图像；但是，典型的CMOS图像传感器捕获自然可用的动态范围的能力有限。即使捕获宽动态范围的图像，也需要在显示WDR场景的能力有限的常规媒体上显示它们。因此，图像已通过称为色调映射运算符的数学运算符进行算法转换，以适应有限的动态范围。在本文中，我们报告了我们对像素的研究，该像素使用内置的色调映射算子（尤其是Reinhard摄影映射算子）捕获了一个场景，该算子是单调递增的函数。但是，固有的固定图案噪声（FPN）限制了图像传感器的性能。这主要是由于像素阵列中各个像素的响应之间存在差异。已采用一种简单的程序来减少使用像素参数响应的FPN，并将FPN建模为各个参数的变化。测量，记录每个像素的参数，然后将其用于校正其响应。

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