以校正去除數位相機的雜訊

雜訊抑制是非常重要的影像處理操戶。所有影像擷取裝置在擷取像素時也會同時取得雜訊，因此雜訊抑制對高品質影像資料的取得影響甚大。雜訊抑制可以在數位相機影像處理流程中由硬體完成，也可以在後處理時以雜訊抑制工具完成。通常硬體作法比較快但後處理佳果比較好。很多雜訊抑制工具提供雜訊側寫功能，可以測量影像擷取裝置的雜訊特性，然後利用此特性更有效地抑制雜訊。大部份工具都是針對一般使用者去處理最後已完成的影像。本文提議將雜訊側寫作為數位相機生產時的校正步驟，並對未處理的原始影像資料進行雜訊抑制，可以在擷取影像時加快處理速度並達到更佳的雜訊抑制效果。

關鍵字

校正；雜訊；數位影像

並列摘要

Noise reduction is a very important operation for image processing. All image capture devices capture image pixels and the noise at the same time and noise reduction is needed to retrieve high-quality image data. Noise reduction can be done in digital camera image pipeline by hardware, or it can be done in post processing by noise reduction tools. Generally the hardware approach is faster but post processing achieves better quality. Many noise reduction tools provide noise-profiling feature which measures the noise characteristic of image capture devices and uses the profiling result to reduce the noise more efficiently. Most of the tools are designed for end users to reduce noise of final image. This paper proposes using noise profiling as a calibration step in digital camera manufacturing and reducing noise in raw data color space. The benefit is faster and better noise reduction during image capture.

並列關鍵字

image ； noise reduction ； calibration

參考文獻

[14] R. Gonzalez and R. Woods, Digital Image Processing, 2nd Edition, Prentice Hall, Upper Saddle River, NJ, 2002.

[30] B. W. Silverman, Density Estimation for Statistics and Data Analysis. CRC Press, Boca Raton, FL, 1986.

[1] J. Adams, K. Parulski, and K. Spaulding, “Color Processing in Digital Cameras,” IEEE Micro, Vol. 18, Issue 6, pp. 20-30, 1998.

[5] D. R. K. Brownrigg, “The Weighted Median Filter,” Communications of the ACM, Vol. 27, No. 8, pp. 807-818, 1984.

[7] C. C. Chang, J. Y. Hsiao, and C. P. Hsieh, “A Fast Noise Reduction Method Based on Human Visual System,” Proceedings of Joint Conference of the Fourth International Conference on Information Communications and Signal Processing and Fourth Pacific-Rim Conference on Multimedia, Singapore, Vol. 3, pp.1879-1883, 2003.

國際替代計量

以校正去除數位相機的雜訊

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