移動偵測系統下之即時對比增強方法

Real Time Contrast Enhancement Method for Change Detection System

李昉昇(Fang-Sheng Lee)

指導教授 ： 林啟芳

元智大學/資訊學院/資訊工程學系/碩士(2007年)

https://doi.org/10.6838/YZU.2007.00193

摘要

隨著科技日新月異，資訊設備普遍發展。監視系統也利用電腦的高運算量來做更深入的計算分析。例如移動物體偵測、對比調整等。
本論文的目的在提出一套方法，可在光線不足的情況下偵測移動物體的進入，並適時調整畫面對比，使移動物體所在的影像清晰明亮。移動偵測的部份利用動差的特性來克服亮度的變動，使系統不受亮度的影響。對比增強則是利用直方圖分組的概念來平均分配整個灰階範圍，使低亮度、低對比的影像轉換為正常對比的清晰影像，而且不會有過度強化的現象。

關鍵字

移動偵測 ； 動差 ； 對比增強

並列摘要

As the technology moving forward, information device has made huge progress. Surveillance System takes advantage of the computational ability to solve more complex problems. For example, change detection and contrast enhancement.
The purpose of this paper is to improve the contrast of the image and clear the whole image when detecting moving objects under insufficient light environment. Change detection system uses the characteristic of image moment to overcome the variation of light. Thus the system is immune to the light variation. Contrast enhancement employs the concept of gray-level grouping to redistribute the histogram components uniformly over the grayscale. Consequently, low-contrast images are transformed to normal images with no over-enhancement.

並列關鍵字

Change Detection ； Moment ； Contrast Enhancement

參考文獻

[11] 黃國烜與林啟芳“與亮度無關之即時移動偵測系統,”元智大學資訊工程研究所碩士論文，2006.

[1] K. Skifstad and R. Jain, “Illumination independent change detection from real world image sequences,” Comput. Vis., Graph., Image Process., vol. 46, pp. 387–399, 1989.

[2] S. L. Liu, C. W. Fu, and S. Chang, ”Statistical change detection with moment under time-varying illumination,” IEEE Transactions on Image Processing, Vol. 7, No. 9, pp. 1258-1268, September 1998.

[5] Y.-T. Kim, “Enhancement using brightness preserving bi-histogram equalization,” IEEE Trans. Consumer Electron., vol. 43, no. 1, pp. 1–8, Feb. 1997.

[6] Y. Wan, Q. Chen, and B.-M. Zhang, “Image enhancement based on equal area dualistic sub-image histogram equalization method,” IEEE Trans Consumer Electron., vol. 45, no. 1, pp. 68–75, Feb. 1999.