Farid H
MIT, Cambridge, MA 02139, USA.
IEEE Trans Image Process. 2001;10(10):1428-33. doi: 10.1109/83.951529.
The luminance nonlinearity introduced by many imaging devices can often be described by a simple point-wise operation (gamma correction). This paper presents a technique for blindly estimating the amount of gamma correction in the absence of any calibration information or knowledge of the imaging device. The basic approach exploits the fact that gamma correction introduces specific higher-order correlations in the frequency domain. These correlations can be detected using tools from polyspectral analysis. The amount of gamma correction is then estimated by minimizing these correlations.
许多成像设备引入的亮度非线性通常可以通过简单的逐点操作（伽马校正）来描述。本文提出了一种在没有任何校准信息或成像设备知识的情况下盲目估计伽马校正量的技术。基本方法利用了伽马校正在频域中引入特定高阶相关性这一事实。这些相关性可以使用多光谱分析工具来检测。然后通过最小化这些相关性来估计伽马校正量。
